update: macaron cores,gzip,session (#10522)
Co-authored-by: zeripath <art27@cantab.net>release/v1.15
6543
GitHub
parent
694f44660f
commit
8d2059a201
13
go.mod
13
go.mod
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@ -8,13 +8,13 @@ require (
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gitea.com/macaron/binding v0.0.0-20190822013154-a5f53841ed2b
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gitea.com/macaron/cache v0.0.0-20190822004001-a6e7fee4ee76
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gitea.com/macaron/captcha v0.0.0-20190822015246-daa973478bae
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gitea.com/macaron/cors v0.0.0-20190821152825-7dcef4a17175
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gitea.com/macaron/cors v0.0.0-20190826180238-95aec09ea8b4
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gitea.com/macaron/csrf v0.0.0-20190822024205-3dc5a4474439
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gitea.com/macaron/gzip v0.0.0-20191118033930-0c4c5566a0e5
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gitea.com/macaron/gzip v0.0.0-20191118041502-506895b47aae
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gitea.com/macaron/i18n v0.0.0-20190822004228-474e714e2223
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gitea.com/macaron/inject v0.0.0-20190805023432-d4c86e31027a
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gitea.com/macaron/macaron v1.4.0
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gitea.com/macaron/session v0.0.0-20190821211443-122c47c5f705
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gitea.com/macaron/session v0.0.0-20191207215012-613cebf0674d
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gitea.com/macaron/toolbox v0.0.0-20190822013122-05ff0fc766b7
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github.com/PuerkitoBio/goquery v1.5.0
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github.com/RoaringBitmap/roaring v0.4.21 // indirect
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@ -25,7 +25,6 @@ require (
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github.com/blevesearch/segment v0.0.0-20160915185041-762005e7a34f // indirect
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github.com/boombuler/barcode v0.0.0-20161226211916-fe0f26ff6d26 // indirect
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github.com/couchbase/gomemcached v0.0.0-20191004160342-7b5da2ec40b2 // indirect
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github.com/couchbase/goutils v0.0.0-20191018232750-b49639060d85 // indirect
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github.com/couchbase/vellum v0.0.0-20190829182332-ef2e028c01fd // indirect
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github.com/cznic/b v0.0.0-20181122101859-a26611c4d92d // indirect
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github.com/cznic/mathutil v0.0.0-20181122101859-297441e03548 // indirect
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@ -59,7 +58,7 @@ require (
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github.com/joho/godotenv v1.3.0 // indirect
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github.com/kballard/go-shellquote v0.0.0-20170619183022-cd60e84ee657
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github.com/keybase/go-crypto v0.0.0-20200123153347-de78d2cb44f4
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github.com/klauspost/compress v1.9.2
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github.com/klauspost/compress v1.10.2
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github.com/lafriks/xormstore v1.3.2
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github.com/lib/pq v1.2.0
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github.com/lunny/dingtalk_webhook v0.0.0-20171025031554-e3534c89ef96
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@ -99,7 +98,7 @@ require (
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github.com/yohcop/openid-go v0.0.0-20160914080427-2c050d2dae53
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github.com/yuin/goldmark v1.1.19
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go.etcd.io/bbolt v1.3.3 // indirect
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golang.org/x/crypto v0.0.0-20200219234226-1ad67e1f0ef4
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golang.org/x/crypto v0.0.0-20200221231518-2aa609cf4a9d
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golang.org/x/net v0.0.0-20200114155413-6afb5195e5aa
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golang.org/x/oauth2 v0.0.0-20190604053449-0f29369cfe45
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golang.org/x/sys v0.0.0-20200219091948-cb0a6d8edb6c
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@ -108,7 +107,7 @@ require (
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gopkg.in/alexcesaro/quotedprintable.v3 v3.0.0-20150716171945-2caba252f4dc // indirect
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gopkg.in/asn1-ber.v1 v1.0.0-20150924051756-4e86f4367175 // indirect
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gopkg.in/gomail.v2 v2.0.0-20160411212932-81ebce5c23df
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gopkg.in/ini.v1 v1.51.1
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gopkg.in/ini.v1 v1.52.0
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gopkg.in/ldap.v3 v3.0.2
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gopkg.in/src-d/go-billy.v4 v4.3.2
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gopkg.in/src-d/go-git.v4 v4.13.1
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20
go.sum
20
go.sum
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@ -17,12 +17,12 @@ gitea.com/macaron/cache v0.0.0-20190822004001-a6e7fee4ee76 h1:mMsMEg90c5KXQgRWsH
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gitea.com/macaron/cache v0.0.0-20190822004001-a6e7fee4ee76/go.mod h1:NFHb9Of+LUnU86bU20CiXXg6ZlgCJ4XytP14UsHOXFs=
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gitea.com/macaron/captcha v0.0.0-20190822015246-daa973478bae h1:9C31eOCpMPbW9rDVq8M1UJ+5HZVYA38HHaKCVcRYDpI=
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gitea.com/macaron/captcha v0.0.0-20190822015246-daa973478bae/go.mod h1:J5h3N+1nKTXtU1x4GxexaQKgAz8UiWecNwi/CfX7CtQ=
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gitea.com/macaron/cors v0.0.0-20190821152825-7dcef4a17175 h1:ikzdAGB6SsUGByW5wKlK+JwzfgQHX+GJnBwEfsaCTNY=
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gitea.com/macaron/cors v0.0.0-20190821152825-7dcef4a17175/go.mod h1:rtOK4J20kpMD9XcNsnO5YA843YSTe/MUMbDj/TJ/Q7A=
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gitea.com/macaron/cors v0.0.0-20190826180238-95aec09ea8b4 h1:e2rAFDejB0qN8OrY4xP4XSu8/yT6QmWxDZpB3J7r2GU=
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gitea.com/macaron/cors v0.0.0-20190826180238-95aec09ea8b4/go.mod h1:rtOK4J20kpMD9XcNsnO5YA843YSTe/MUMbDj/TJ/Q7A=
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gitea.com/macaron/csrf v0.0.0-20190822024205-3dc5a4474439 h1:88c34YM29a1GlWLrLBaG/GTT2htDdJz1u3n9+lmPolg=
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gitea.com/macaron/csrf v0.0.0-20190822024205-3dc5a4474439/go.mod h1:IsQPHx73HnnqFBYiVHjg87q4XBZyGXXu77xANukvZuk=
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gitea.com/macaron/gzip v0.0.0-20191118033930-0c4c5566a0e5 h1:G/a7r0r2jEelSynBlv1+PAEZQKfsdRHQUMb1PlNvemM=
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gitea.com/macaron/gzip v0.0.0-20191118033930-0c4c5566a0e5/go.mod h1:jGHtoovArcQj+sw7NJxyPgjuRxOSG9a/oFu3VkLRTKQ=
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gitea.com/macaron/gzip v0.0.0-20191118041502-506895b47aae h1:OXxYwGmGNfYrC0/sUUL9KSvr2Sfvmzwgd2YD65vIjGE=
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gitea.com/macaron/gzip v0.0.0-20191118041502-506895b47aae/go.mod h1:jGHtoovArcQj+sw7NJxyPgjuRxOSG9a/oFu3VkLRTKQ=
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gitea.com/macaron/i18n v0.0.0-20190822004228-474e714e2223 h1:iZWwQif/LHMjBgfY/ua8CFVa4XMDfbbs7EZ0Q1dYguU=
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gitea.com/macaron/i18n v0.0.0-20190822004228-474e714e2223/go.mod h1:+qsc10s4hBsHKU/9luGGumFh4m5FFVc7uih+8/mM1NY=
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gitea.com/macaron/inject v0.0.0-20190803172902-8375ba841591/go.mod h1:h6E4kLao1Yko6DOU6QDnQPcuoNzvbZqzj2mtPcEn1aM=
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@ -35,6 +35,8 @@ gitea.com/macaron/macaron v1.4.0 h1:FY1QDGqyuUzs21K6ChkbYbRUfwL7v2aUrhNEJ0IgsAw=
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gitea.com/macaron/macaron v1.4.0/go.mod h1:P7hfDbQjcW22lkYkXlxdRIfWOXxH2+K4EogN4Q0UlLY=
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gitea.com/macaron/session v0.0.0-20190821211443-122c47c5f705 h1:mvkQGAlON1Z6Y8pqa/+FpYIskk54mazuECUfZK5oTg0=
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gitea.com/macaron/session v0.0.0-20190821211443-122c47c5f705/go.mod h1:1ujH0jD6Ca4iK9NL0Q2a7fG2chvXx5hVa7hBfABwpkA=
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gitea.com/macaron/session v0.0.0-20191207215012-613cebf0674d h1:XLww3CvnFZkXVwauN67fniDaIpIqsE+9KVcxlZKlvLU=
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gitea.com/macaron/session v0.0.0-20191207215012-613cebf0674d/go.mod h1:FanKy3WjWb5iw/iZBPk4ggoQT9FcM6bkBPvmDmsH6tY=
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gitea.com/macaron/toolbox v0.0.0-20190822013122-05ff0fc766b7 h1:N9QFoeNsUXLhl14mefLzGluqV7w2mGU3u+iZU+jCeWk=
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gitea.com/macaron/toolbox v0.0.0-20190822013122-05ff0fc766b7/go.mod h1:kgsbFPPS4P+acDYDOPDa3N4IWWOuDJt5/INKRUz7aks=
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github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
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@ -349,6 +351,8 @@ github.com/kisielk/errcheck v1.1.0/go.mod h1:EZBBE59ingxPouuu3KfxchcWSUPOHkagtvW
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github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+oQHNcck=
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github.com/klauspost/compress v1.9.2 h1:LfVyl+ZlLlLDeQ/d2AqfGIIH4qEDu0Ed2S5GyhCWIWY=
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github.com/klauspost/compress v1.9.2/go.mod h1:RyIbtBH6LamlWaDj8nUwkbUhJ87Yi3uG0guNDohfE1A=
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github.com/klauspost/compress v1.10.2 h1:Znfn6hXZAHaLPNnlqUYRrBSReFHYybslgv4PTiyz6P0=
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github.com/klauspost/compress v1.10.2/go.mod h1:aoV0uJVorq1K+umq18yTdKaF57EivdYsUV+/s2qKfXs=
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github.com/konsorten/go-windows-terminal-sequences v1.0.1/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
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github.com/kr/logfmt v0.0.0-20140226030751-b84e30acd515/go.mod h1:+0opPa2QZZtGFBFZlji/RkVcI2GknAs/DXo4wKdlNEc=
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github.com/kr/pretty v0.1.0 h1:L/CwN0zerZDmRFUapSPitk6f+Q3+0za1rQkzVuMiMFI=
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@ -602,8 +606,8 @@ golang.org/x/crypto v0.0.0-20190907121410-71b5226ff739/go.mod h1:yigFU9vqHzYiE8U
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golang.org/x/crypto v0.0.0-20190927123631-a832865fa7ad h1:5E5raQxcv+6CZ11RrBYQe5WRbUIWpScjh0kvHZkZIrQ=
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golang.org/x/crypto v0.0.0-20190927123631-a832865fa7ad/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
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golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
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golang.org/x/crypto v0.0.0-20200219234226-1ad67e1f0ef4 h1:4icQlpeqbz3WxfgP6Eq3szTj95KTrlH/CwzBzoxuFd0=
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golang.org/x/crypto v0.0.0-20200219234226-1ad67e1f0ef4/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
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golang.org/x/crypto v0.0.0-20200221231518-2aa609cf4a9d h1:1ZiEyfaQIg3Qh0EoqpwAakHVhecoE5wlSg5GjnafJGw=
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golang.org/x/crypto v0.0.0-20200221231518-2aa609cf4a9d/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
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golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
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golang.org/x/exp v0.0.0-20190510132918-efd6b22b2522/go.mod h1:ZjyILWgesfNpC6sMxTJOJm9Kp84zZh5NQWvqDGG3Qr8=
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golang.org/x/image v0.0.0-20190227222117-0694c2d4d067/go.mod h1:kZ7UVZpmo3dzQBMxlp+ypCbDeSB+sBbTgSJuh5dn5js=
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@ -746,8 +750,8 @@ gopkg.in/ini.v1 v1.42.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
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gopkg.in/ini.v1 v1.44.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
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gopkg.in/ini.v1 v1.44.2/go.mod h1:M3Cogqpuv0QCi3ExAY5V4uOt4qb/R3xZubo9m8lK5wg=
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gopkg.in/ini.v1 v1.46.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
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gopkg.in/ini.v1 v1.51.1 h1:GyboHr4UqMiLUybYjd22ZjQIKEJEpgtLXtuGbR21Oho=
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gopkg.in/ini.v1 v1.51.1/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
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gopkg.in/ini.v1 v1.52.0 h1:j+Lt/M1oPPejkniCg1TkWE2J3Eh1oZTsHSXzMTzUXn4=
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gopkg.in/ini.v1 v1.52.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
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gopkg.in/ldap.v3 v3.0.2 h1:R6RBtabK6e1GO0eQKtkyOFbAHO73QesLzI2w2DZ6b9w=
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gopkg.in/ldap.v3 v3.0.2/go.mod h1:oxD7NyBuxchC+SgJDE1Q5Od05eGt29SDQVBmV+HYbzw=
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gopkg.in/resty.v1 v1.12.0/go.mod h1:mDo4pnntr5jdWRML875a/NmxYqAlA73dVijT2AXvQQo=
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@ -151,7 +151,8 @@ func CORS(options ...Options) macaron.Handler {
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}
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})
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if reqOptions {
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ctx.Status(200) // return response
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ctx.Resp.WriteHeader(200) // return response
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return
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}
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}
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}
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@ -0,0 +1,24 @@
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kind: pipeline
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name: go1-1-2
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steps:
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- name: test
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image: golang:1.12
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environment:
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GOPROXY: https://goproxy.cn
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commands:
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- go build -v
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- go test -v -race -coverprofile=coverage.txt -covermode=atomic
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---
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kind: pipeline
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name: go1-1-3
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steps:
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- name: test
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image: golang:1.13
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environment:
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GOPROXY: https://goproxy.cn
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commands:
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- go build -v
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- go test -v -race -coverprofile=coverage.txt -covermode=atomic
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@ -0,0 +1,19 @@
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# gzip
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Middleware gzip provides gzip comparess middleware for [Macaron](https://gitea.com/macaron/macaron).
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### Installation
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|
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go get gitea.com/macaron/gzip
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## Getting Help
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- [API Reference](https://godoc.org/gitea.com/macaron/gzip)
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## Credits
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|
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This package is a modified version of [go-macaron gzip](github.com/go-macaron/gzip).
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## License
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|
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This project is under the Apache License, Version 2.0. See the [LICENSE](LICENSE) file for the full license text.
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@ -6,7 +6,7 @@ require (
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gitea.com/macaron/macaron v1.3.3-0.20190821202302-9646c0587edb
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github.com/bradfitz/gomemcache v0.0.0-20190329173943-551aad21a668
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github.com/couchbase/gomemcached v0.0.0-20190515232915-c4b4ca0eb21d // indirect
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github.com/couchbase/goutils v0.0.0-20190315194238-f9d42b11473b // indirect
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github.com/couchbase/goutils v0.0.0-20191018232750-b49639060d85 // indirect
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github.com/couchbaselabs/go-couchbase v0.0.0-20190708161019-23e7ca2ce2b7
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github.com/cupcake/rdb v0.0.0-20161107195141-43ba34106c76 // indirect
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github.com/edsrzf/mmap-go v1.0.0 // indirect
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|
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@ -8,8 +8,8 @@ github.com/bradfitz/gomemcache v0.0.0-20190329173943-551aad21a668 h1:U/lr3Dgy4WK
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github.com/bradfitz/gomemcache v0.0.0-20190329173943-551aad21a668/go.mod h1:H0wQNHz2YrLsuXOZozoeDmnHXkNCRmMW0gwFWDfEZDA=
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github.com/couchbase/gomemcached v0.0.0-20190515232915-c4b4ca0eb21d h1:XMf4E1U+b9E3ElF0mjvfXZdflBRZz4gLp16nQ/QSHQM=
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github.com/couchbase/gomemcached v0.0.0-20190515232915-c4b4ca0eb21d/go.mod h1:srVSlQLB8iXBVXHgnqemxUXqN6FCvClgCMPCsjBDR7c=
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github.com/couchbase/goutils v0.0.0-20190315194238-f9d42b11473b h1:bZ9rKU2/V8sY+NulSfxDOnXTWcs1rySqdF1sVepihvo=
|
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github.com/couchbase/goutils v0.0.0-20190315194238-f9d42b11473b/go.mod h1:BQwMFlJzDjFDG3DJUdU0KORxn88UlsOULuxLExMh3Hs=
|
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github.com/couchbase/goutils v0.0.0-20191018232750-b49639060d85 h1:0WMIDtuXCKEm4wtAJgAAXa/qtM5O9MariLwgHaRlYmk=
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github.com/couchbase/goutils v0.0.0-20191018232750-b49639060d85/go.mod h1:BQwMFlJzDjFDG3DJUdU0KORxn88UlsOULuxLExMh3Hs=
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github.com/couchbaselabs/go-couchbase v0.0.0-20190708161019-23e7ca2ce2b7 h1:1XjEY/gnjQ+AfXef2U6dxCquhiRzkEpxZuWqs+QxTL8=
|
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github.com/couchbaselabs/go-couchbase v0.0.0-20190708161019-23e7ca2ce2b7/go.mod h1:mby/05p8HE5yHEAKiIH/555NoblMs7PtW6NrYshDruc=
|
||||
github.com/cupcake/rdb v0.0.0-20161107195141-43ba34106c76 h1:Lgdd/Qp96Qj8jqLpq2cI1I1X7BJnu06efS+XkhRoLUQ=
|
||||
|
|
|
|||
|
|
@ -48,6 +48,8 @@ const (
|
|||
maxHashOffset = 1 << 24
|
||||
|
||||
skipNever = math.MaxInt32
|
||||
|
||||
debugDeflate = false
|
||||
)
|
||||
|
||||
type compressionLevel struct {
|
||||
|
|
@ -59,15 +61,13 @@ type compressionLevel struct {
|
|||
// See https://blog.klauspost.com/rebalancing-deflate-compression-levels/
|
||||
var levels = []compressionLevel{
|
||||
{}, // 0
|
||||
// Level 1-4 uses specialized algorithm - values not used
|
||||
// Level 1-6 uses specialized algorithm - values not used
|
||||
{0, 0, 0, 0, 0, 1},
|
||||
{0, 0, 0, 0, 0, 2},
|
||||
{0, 0, 0, 0, 0, 3},
|
||||
{0, 0, 0, 0, 0, 4},
|
||||
// For levels 5-6 we don't bother trying with lazy matches.
|
||||
// Lazy matching is at least 30% slower, with 1.5% increase.
|
||||
{6, 0, 12, 8, 12, 5},
|
||||
{8, 0, 24, 16, 16, 6},
|
||||
{0, 0, 0, 0, 0, 5},
|
||||
{0, 0, 0, 0, 0, 6},
|
||||
// Levels 7-9 use increasingly more lazy matching
|
||||
// and increasingly stringent conditions for "good enough".
|
||||
{8, 8, 24, 16, skipNever, 7},
|
||||
|
|
@ -203,9 +203,8 @@ func (d *compressor) writeBlockSkip(tok *tokens, index int, eof bool) error {
|
|||
// This is much faster than doing a full encode.
|
||||
// Should only be used after a start/reset.
|
||||
func (d *compressor) fillWindow(b []byte) {
|
||||
// Do not fill window if we are in store-only mode,
|
||||
// use constant or Snappy compression.
|
||||
if d.level == 0 {
|
||||
// Do not fill window if we are in store-only or huffman mode.
|
||||
if d.level <= 0 {
|
||||
return
|
||||
}
|
||||
if d.fast != nil {
|
||||
|
|
@ -368,7 +367,7 @@ func (d *compressor) deflateLazy() {
|
|||
// Sanity enables additional runtime tests.
|
||||
// It's intended to be used during development
|
||||
// to supplement the currently ad-hoc unit tests.
|
||||
const sanity = false
|
||||
const sanity = debugDeflate
|
||||
|
||||
if d.windowEnd-s.index < minMatchLength+maxMatchLength && !d.sync {
|
||||
return
|
||||
|
|
@ -644,7 +643,7 @@ func (d *compressor) init(w io.Writer, level int) (err error) {
|
|||
d.fill = (*compressor).fillBlock
|
||||
d.step = (*compressor).store
|
||||
case level == ConstantCompression:
|
||||
d.w.logReusePenalty = uint(4)
|
||||
d.w.logNewTablePenalty = 4
|
||||
d.window = make([]byte, maxStoreBlockSize)
|
||||
d.fill = (*compressor).fillBlock
|
||||
d.step = (*compressor).storeHuff
|
||||
|
|
@ -652,13 +651,13 @@ func (d *compressor) init(w io.Writer, level int) (err error) {
|
|||
level = 5
|
||||
fallthrough
|
||||
case level >= 1 && level <= 6:
|
||||
d.w.logReusePenalty = uint(level + 1)
|
||||
d.w.logNewTablePenalty = 6
|
||||
d.fast = newFastEnc(level)
|
||||
d.window = make([]byte, maxStoreBlockSize)
|
||||
d.fill = (*compressor).fillBlock
|
||||
d.step = (*compressor).storeFast
|
||||
case 7 <= level && level <= 9:
|
||||
d.w.logReusePenalty = uint(level)
|
||||
d.w.logNewTablePenalty = 10
|
||||
d.state = &advancedState{}
|
||||
d.compressionLevel = levels[level]
|
||||
d.initDeflate()
|
||||
|
|
@ -667,6 +666,7 @@ func (d *compressor) init(w io.Writer, level int) (err error) {
|
|||
default:
|
||||
return fmt.Errorf("flate: invalid compression level %d: want value in range [-2, 9]", level)
|
||||
}
|
||||
d.level = level
|
||||
return nil
|
||||
}
|
||||
|
||||
|
|
@ -720,6 +720,7 @@ func (d *compressor) close() error {
|
|||
return d.w.err
|
||||
}
|
||||
d.w.flush()
|
||||
d.w.reset(nil)
|
||||
return d.w.err
|
||||
}
|
||||
|
||||
|
|
@ -750,8 +751,7 @@ func NewWriter(w io.Writer, level int) (*Writer, error) {
|
|||
// can only be decompressed by a Reader initialized with the
|
||||
// same dictionary.
|
||||
func NewWriterDict(w io.Writer, level int, dict []byte) (*Writer, error) {
|
||||
dw := &dictWriter{w}
|
||||
zw, err := NewWriter(dw, level)
|
||||
zw, err := NewWriter(w, level)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
|
@ -760,14 +760,6 @@ func NewWriterDict(w io.Writer, level int, dict []byte) (*Writer, error) {
|
|||
return zw, err
|
||||
}
|
||||
|
||||
type dictWriter struct {
|
||||
w io.Writer
|
||||
}
|
||||
|
||||
func (w *dictWriter) Write(b []byte) (n int, err error) {
|
||||
return w.w.Write(b)
|
||||
}
|
||||
|
||||
// A Writer takes data written to it and writes the compressed
|
||||
// form of that data to an underlying writer (see NewWriter).
|
||||
type Writer struct {
|
||||
|
|
@ -805,11 +797,12 @@ func (w *Writer) Close() error {
|
|||
// the result of NewWriter or NewWriterDict called with dst
|
||||
// and w's level and dictionary.
|
||||
func (w *Writer) Reset(dst io.Writer) {
|
||||
if dw, ok := w.d.w.writer.(*dictWriter); ok {
|
||||
if len(w.dict) > 0 {
|
||||
// w was created with NewWriterDict
|
||||
dw.w = dst
|
||||
w.d.reset(dw)
|
||||
w.d.reset(dst)
|
||||
if dst != nil {
|
||||
w.d.fillWindow(w.dict)
|
||||
}
|
||||
} else {
|
||||
// w was created with NewWriter
|
||||
w.d.reset(dst)
|
||||
|
|
|
|||
|
|
@ -35,17 +35,17 @@ func newFastEnc(level int) fastEnc {
|
|||
}
|
||||
|
||||
const (
|
||||
tableBits = 16 // Bits used in the table
|
||||
tableBits = 15 // Bits used in the table
|
||||
tableSize = 1 << tableBits // Size of the table
|
||||
tableShift = 32 - tableBits // Right-shift to get the tableBits most significant bits of a uint32.
|
||||
baseMatchOffset = 1 // The smallest match offset
|
||||
baseMatchLength = 3 // The smallest match length per the RFC section 3.2.5
|
||||
maxMatchOffset = 1 << 15 // The largest match offset
|
||||
|
||||
bTableBits = 18 // Bits used in the big tables
|
||||
bTableBits = 17 // Bits used in the big tables
|
||||
bTableSize = 1 << bTableBits // Size of the table
|
||||
allocHistory = maxMatchOffset * 10 // Size to preallocate for history.
|
||||
bufferReset = (1 << 31) - allocHistory - maxStoreBlockSize // Reset the buffer offset when reaching this.
|
||||
allocHistory = maxStoreBlockSize * 10 // Size to preallocate for history.
|
||||
bufferReset = (1 << 31) - allocHistory - maxStoreBlockSize - 1 // Reset the buffer offset when reaching this.
|
||||
)
|
||||
|
||||
const (
|
||||
|
|
@ -92,7 +92,6 @@ func hash(u uint32) uint32 {
|
|||
}
|
||||
|
||||
type tableEntry struct {
|
||||
val uint32
|
||||
offset int32
|
||||
}
|
||||
|
||||
|
|
@ -210,16 +209,14 @@ func (e *fastGen) matchlenLong(s, t int32, src []byte) int32 {
|
|||
|
||||
// Reset the encoding table.
|
||||
func (e *fastGen) Reset() {
|
||||
if cap(e.hist) < int(maxMatchOffset*8) {
|
||||
l := maxMatchOffset * 8
|
||||
// Make it at least 1MB.
|
||||
if l < 1<<20 {
|
||||
l = 1 << 20
|
||||
if cap(e.hist) < allocHistory {
|
||||
e.hist = make([]byte, 0, allocHistory)
|
||||
}
|
||||
e.hist = make([]byte, 0, l)
|
||||
}
|
||||
// We offset current position so everything will be out of reach
|
||||
// We offset current position so everything will be out of reach.
|
||||
// If we are above the buffer reset it will be cleared anyway since len(hist) == 0.
|
||||
if e.cur <= bufferReset {
|
||||
e.cur += maxMatchOffset + int32(len(e.hist))
|
||||
}
|
||||
e.hist = e.hist[:0]
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -0,0 +1,274 @@
|
|||
// +build generate
|
||||
|
||||
//go:generate go run $GOFILE && gofmt -w inflate_gen.go
|
||||
|
||||
package main
|
||||
|
||||
import (
|
||||
"os"
|
||||
"strings"
|
||||
)
|
||||
|
||||
func main() {
|
||||
f, err := os.Create("inflate_gen.go")
|
||||
if err != nil {
|
||||
panic(err)
|
||||
}
|
||||
defer f.Close()
|
||||
types := []string{"*bytes.Buffer", "*bytes.Reader", "*bufio.Reader", "*strings.Reader"}
|
||||
names := []string{"BytesBuffer", "BytesReader", "BufioReader", "StringsReader"}
|
||||
imports := []string{"bytes", "bufio", "io", "strings", "math/bits"}
|
||||
f.WriteString(`// Code generated by go generate gen_inflate.go. DO NOT EDIT.
|
||||
|
||||
package flate
|
||||
|
||||
import (
|
||||
`)
|
||||
|
||||
for _, imp := range imports {
|
||||
f.WriteString("\t\"" + imp + "\"\n")
|
||||
}
|
||||
f.WriteString(")\n\n")
|
||||
|
||||
template := `
|
||||
|
||||
// Decode a single Huffman block from f.
|
||||
// hl and hd are the Huffman states for the lit/length values
|
||||
// and the distance values, respectively. If hd == nil, using the
|
||||
// fixed distance encoding associated with fixed Huffman blocks.
|
||||
func (f *decompressor) $FUNCNAME$() {
|
||||
const (
|
||||
stateInit = iota // Zero value must be stateInit
|
||||
stateDict
|
||||
)
|
||||
fr := f.r.($TYPE$)
|
||||
moreBits := func() error {
|
||||
c, err := fr.ReadByte()
|
||||
if err != nil {
|
||||
return noEOF(err)
|
||||
}
|
||||
f.roffset++
|
||||
f.b |= uint32(c) << f.nb
|
||||
f.nb += 8
|
||||
return nil
|
||||
}
|
||||
|
||||
switch f.stepState {
|
||||
case stateInit:
|
||||
goto readLiteral
|
||||
case stateDict:
|
||||
goto copyHistory
|
||||
}
|
||||
|
||||
readLiteral:
|
||||
// Read literal and/or (length, distance) according to RFC section 3.2.3.
|
||||
{
|
||||
var v int
|
||||
{
|
||||
// Inlined v, err := f.huffSym(f.hl)
|
||||
// Since a huffmanDecoder can be empty or be composed of a degenerate tree
|
||||
// with single element, huffSym must error on these two edge cases. In both
|
||||
// cases, the chunks slice will be 0 for the invalid sequence, leading it
|
||||
// satisfy the n == 0 check below.
|
||||
n := uint(f.hl.maxRead)
|
||||
// Optimization. Compiler isn't smart enough to keep f.b,f.nb in registers,
|
||||
// but is smart enough to keep local variables in registers, so use nb and b,
|
||||
// inline call to moreBits and reassign b,nb back to f on return.
|
||||
nb, b := f.nb, f.b
|
||||
for {
|
||||
for nb < n {
|
||||
c, err := fr.ReadByte()
|
||||
if err != nil {
|
||||
f.b = b
|
||||
f.nb = nb
|
||||
f.err = noEOF(err)
|
||||
return
|
||||
}
|
||||
f.roffset++
|
||||
b |= uint32(c) << (nb & 31)
|
||||
nb += 8
|
||||
}
|
||||
chunk := f.hl.chunks[b&(huffmanNumChunks-1)]
|
||||
n = uint(chunk & huffmanCountMask)
|
||||
if n > huffmanChunkBits {
|
||||
chunk = f.hl.links[chunk>>huffmanValueShift][(b>>huffmanChunkBits)&f.hl.linkMask]
|
||||
n = uint(chunk & huffmanCountMask)
|
||||
}
|
||||
if n <= nb {
|
||||
if n == 0 {
|
||||
f.b = b
|
||||
f.nb = nb
|
||||
if debugDecode {
|
||||
fmt.Println("huffsym: n==0")
|
||||
}
|
||||
f.err = CorruptInputError(f.roffset)
|
||||
return
|
||||
}
|
||||
f.b = b >> (n & 31)
|
||||
f.nb = nb - n
|
||||
v = int(chunk >> huffmanValueShift)
|
||||
break
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
var n uint // number of bits extra
|
||||
var length int
|
||||
var err error
|
||||
switch {
|
||||
case v < 256:
|
||||
f.dict.writeByte(byte(v))
|
||||
if f.dict.availWrite() == 0 {
|
||||
f.toRead = f.dict.readFlush()
|
||||
f.step = (*decompressor).$FUNCNAME$
|
||||
f.stepState = stateInit
|
||||
return
|
||||
}
|
||||
goto readLiteral
|
||||
case v == 256:
|
||||
f.finishBlock()
|
||||
return
|
||||
// otherwise, reference to older data
|
||||
case v < 265:
|
||||
length = v - (257 - 3)
|
||||
n = 0
|
||||
case v < 269:
|
||||
length = v*2 - (265*2 - 11)
|
||||
n = 1
|
||||
case v < 273:
|
||||
length = v*4 - (269*4 - 19)
|
||||
n = 2
|
||||
case v < 277:
|
||||
length = v*8 - (273*8 - 35)
|
||||
n = 3
|
||||
case v < 281:
|
||||
length = v*16 - (277*16 - 67)
|
||||
n = 4
|
||||
case v < 285:
|
||||
length = v*32 - (281*32 - 131)
|
||||
n = 5
|
||||
case v < maxNumLit:
|
||||
length = 258
|
||||
n = 0
|
||||
default:
|
||||
if debugDecode {
|
||||
fmt.Println(v, ">= maxNumLit")
|
||||
}
|
||||
f.err = CorruptInputError(f.roffset)
|
||||
return
|
||||
}
|
||||
if n > 0 {
|
||||
for f.nb < n {
|
||||
if err = moreBits(); err != nil {
|
||||
if debugDecode {
|
||||
fmt.Println("morebits n>0:", err)
|
||||
}
|
||||
f.err = err
|
||||
return
|
||||
}
|
||||
}
|
||||
length += int(f.b & uint32(1<<n-1))
|
||||
f.b >>= n
|
||||
f.nb -= n
|
||||
}
|
||||
|
||||
var dist int
|
||||
if f.hd == nil {
|
||||
for f.nb < 5 {
|
||||
if err = moreBits(); err != nil {
|
||||
if debugDecode {
|
||||
fmt.Println("morebits f.nb<5:", err)
|
||||
}
|
||||
f.err = err
|
||||
return
|
||||
}
|
||||
}
|
||||
dist = int(bits.Reverse8(uint8(f.b & 0x1F << 3)))
|
||||
f.b >>= 5
|
||||
f.nb -= 5
|
||||
} else {
|
||||
if dist, err = f.huffSym(f.hd); err != nil {
|
||||
if debugDecode {
|
||||
fmt.Println("huffsym:", err)
|
||||
}
|
||||
f.err = err
|
||||
return
|
||||
}
|
||||
}
|
||||
|
||||
switch {
|
||||
case dist < 4:
|
||||
dist++
|
||||
case dist < maxNumDist:
|
||||
nb := uint(dist-2) >> 1
|
||||
// have 1 bit in bottom of dist, need nb more.
|
||||
extra := (dist & 1) << nb
|
||||
for f.nb < nb {
|
||||
if err = moreBits(); err != nil {
|
||||
if debugDecode {
|
||||
fmt.Println("morebits f.nb<nb:", err)
|
||||
}
|
||||
f.err = err
|
||||
return
|
||||
}
|
||||
}
|
||||
extra |= int(f.b & uint32(1<<nb-1))
|
||||
f.b >>= nb
|
||||
f.nb -= nb
|
||||
dist = 1<<(nb+1) + 1 + extra
|
||||
default:
|
||||
if debugDecode {
|
||||
fmt.Println("dist too big:", dist, maxNumDist)
|
||||
}
|
||||
f.err = CorruptInputError(f.roffset)
|
||||
return
|
||||
}
|
||||
|
||||
// No check on length; encoding can be prescient.
|
||||
if dist > f.dict.histSize() {
|
||||
if debugDecode {
|
||||
fmt.Println("dist > f.dict.histSize():", dist, f.dict.histSize())
|
||||
}
|
||||
f.err = CorruptInputError(f.roffset)
|
||||
return
|
||||
}
|
||||
|
||||
f.copyLen, f.copyDist = length, dist
|
||||
goto copyHistory
|
||||
}
|
||||
|
||||
copyHistory:
|
||||
// Perform a backwards copy according to RFC section 3.2.3.
|
||||
{
|
||||
cnt := f.dict.tryWriteCopy(f.copyDist, f.copyLen)
|
||||
if cnt == 0 {
|
||||
cnt = f.dict.writeCopy(f.copyDist, f.copyLen)
|
||||
}
|
||||
f.copyLen -= cnt
|
||||
|
||||
if f.dict.availWrite() == 0 || f.copyLen > 0 {
|
||||
f.toRead = f.dict.readFlush()
|
||||
f.step = (*decompressor).$FUNCNAME$ // We need to continue this work
|
||||
f.stepState = stateDict
|
||||
return
|
||||
}
|
||||
goto readLiteral
|
||||
}
|
||||
}
|
||||
|
||||
`
|
||||
for i, t := range types {
|
||||
s := strings.Replace(template, "$FUNCNAME$", "huffman"+names[i], -1)
|
||||
s = strings.Replace(s, "$TYPE$", t, -1)
|
||||
f.WriteString(s)
|
||||
}
|
||||
f.WriteString("func (f *decompressor) huffmanBlockDecoder() func() {\n")
|
||||
f.WriteString("\tswitch f.r.(type) {\n")
|
||||
for i, t := range types {
|
||||
f.WriteString("\t\tcase " + t + ":\n")
|
||||
f.WriteString("\t\t\treturn f.huffman" + names[i] + "\n")
|
||||
}
|
||||
f.WriteString("\t\tdefault:\n")
|
||||
f.WriteString("\t\t\treturn f.huffmanBlockGeneric")
|
||||
f.WriteString("\t}\n}\n")
|
||||
}
|
||||
|
|
@ -93,7 +93,7 @@ type huffmanBitWriter struct {
|
|||
err error
|
||||
lastHeader int
|
||||
// Set between 0 (reused block can be up to 2x the size)
|
||||
logReusePenalty uint
|
||||
logNewTablePenalty uint
|
||||
lastHuffMan bool
|
||||
bytes [256]byte
|
||||
literalFreq [lengthCodesStart + 32]uint16
|
||||
|
|
@ -119,7 +119,7 @@ type huffmanBitWriter struct {
|
|||
// If lastHuffMan is set, a table for outputting literals has been generated and offsets are invalid.
|
||||
//
|
||||
// An incoming block estimates the output size of a new table using a 'fresh' by calculating the
|
||||
// optimal size and adding a penalty in 'logReusePenalty'.
|
||||
// optimal size and adding a penalty in 'logNewTablePenalty'.
|
||||
// A Huffman table is not optimal, which is why we add a penalty, and generating a new table
|
||||
// is slower both for compression and decompression.
|
||||
|
||||
|
|
@ -135,7 +135,6 @@ func newHuffmanBitWriter(w io.Writer) *huffmanBitWriter {
|
|||
func (w *huffmanBitWriter) reset(writer io.Writer) {
|
||||
w.writer = writer
|
||||
w.bits, w.nbits, w.nbytes, w.err = 0, 0, 0, nil
|
||||
w.bytes = [256]byte{}
|
||||
w.lastHeader = 0
|
||||
w.lastHuffMan = false
|
||||
}
|
||||
|
|
@ -178,6 +177,11 @@ func (w *huffmanBitWriter) flush() {
|
|||
w.nbits = 0
|
||||
return
|
||||
}
|
||||
if w.lastHeader > 0 {
|
||||
// We owe an EOB
|
||||
w.writeCode(w.literalEncoding.codes[endBlockMarker])
|
||||
w.lastHeader = 0
|
||||
}
|
||||
n := w.nbytes
|
||||
for w.nbits != 0 {
|
||||
w.bytes[n] = byte(w.bits)
|
||||
|
|
@ -350,6 +354,13 @@ func (w *huffmanBitWriter) headerSize() (size, numCodegens int) {
|
|||
int(w.codegenFreq[18])*7, numCodegens
|
||||
}
|
||||
|
||||
// dynamicSize returns the size of dynamically encoded data in bits.
|
||||
func (w *huffmanBitWriter) dynamicReuseSize(litEnc, offEnc *huffmanEncoder) (size int) {
|
||||
size = litEnc.bitLength(w.literalFreq[:]) +
|
||||
offEnc.bitLength(w.offsetFreq[:])
|
||||
return size
|
||||
}
|
||||
|
||||
// dynamicSize returns the size of dynamically encoded data in bits.
|
||||
func (w *huffmanBitWriter) dynamicSize(litEnc, offEnc *huffmanEncoder, extraBits int) (size, numCodegens int) {
|
||||
header, numCodegens := w.headerSize()
|
||||
|
|
@ -452,30 +463,30 @@ func (w *huffmanBitWriter) writeDynamicHeader(numLiterals int, numOffsets int, n
|
|||
|
||||
i := 0
|
||||
for {
|
||||
var codeWord int = int(w.codegen[i])
|
||||
var codeWord = uint32(w.codegen[i])
|
||||
i++
|
||||
if codeWord == badCode {
|
||||
break
|
||||
}
|
||||
w.writeCode(w.codegenEncoding.codes[uint32(codeWord)])
|
||||
w.writeCode(w.codegenEncoding.codes[codeWord])
|
||||
|
||||
switch codeWord {
|
||||
case 16:
|
||||
w.writeBits(int32(w.codegen[i]), 2)
|
||||
i++
|
||||
break
|
||||
case 17:
|
||||
w.writeBits(int32(w.codegen[i]), 3)
|
||||
i++
|
||||
break
|
||||
case 18:
|
||||
w.writeBits(int32(w.codegen[i]), 7)
|
||||
i++
|
||||
break
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// writeStoredHeader will write a stored header.
|
||||
// If the stored block is only used for EOF,
|
||||
// it is replaced with a fixed huffman block.
|
||||
func (w *huffmanBitWriter) writeStoredHeader(length int, isEof bool) {
|
||||
if w.err != nil {
|
||||
return
|
||||
|
|
@ -485,6 +496,16 @@ func (w *huffmanBitWriter) writeStoredHeader(length int, isEof bool) {
|
|||
w.writeCode(w.literalEncoding.codes[endBlockMarker])
|
||||
w.lastHeader = 0
|
||||
}
|
||||
|
||||
// To write EOF, use a fixed encoding block. 10 bits instead of 5 bytes.
|
||||
if length == 0 && isEof {
|
||||
w.writeFixedHeader(isEof)
|
||||
// EOB: 7 bits, value: 0
|
||||
w.writeBits(0, 7)
|
||||
w.flush()
|
||||
return
|
||||
}
|
||||
|
||||
var flag int32
|
||||
if isEof {
|
||||
flag = 1
|
||||
|
|
@ -591,8 +612,8 @@ func (w *huffmanBitWriter) writeBlockDynamic(tokens *tokens, eof bool, input []b
|
|||
tokens.AddEOB()
|
||||
}
|
||||
|
||||
// We cannot reuse pure huffman table.
|
||||
if w.lastHuffMan && w.lastHeader > 0 {
|
||||
// We cannot reuse pure huffman table, and must mark as EOF.
|
||||
if (w.lastHuffMan || eof) && w.lastHeader > 0 {
|
||||
// We will not try to reuse.
|
||||
w.writeCode(w.literalEncoding.codes[endBlockMarker])
|
||||
w.lastHeader = 0
|
||||
|
|
@ -606,14 +627,14 @@ func (w *huffmanBitWriter) writeBlockDynamic(tokens *tokens, eof bool, input []b
|
|||
var size int
|
||||
// Check if we should reuse.
|
||||
if w.lastHeader > 0 {
|
||||
// Estimate size for using a new table
|
||||
// Estimate size for using a new table.
|
||||
// Use the previous header size as the best estimate.
|
||||
newSize := w.lastHeader + tokens.EstimatedBits()
|
||||
newSize += newSize >> w.logNewTablePenalty
|
||||
|
||||
// The estimated size is calculated as an optimal table.
|
||||
// We add a penalty to make it more realistic and re-use a bit more.
|
||||
newSize += newSize >> (w.logReusePenalty & 31)
|
||||
extra := w.extraBitSize()
|
||||
reuseSize, _ := w.dynamicSize(w.literalEncoding, w.offsetEncoding, extra)
|
||||
reuseSize := w.dynamicReuseSize(w.literalEncoding, w.offsetEncoding) + w.extraBitSize()
|
||||
|
||||
// Check if a new table is better.
|
||||
if newSize < reuseSize {
|
||||
|
|
@ -805,21 +826,30 @@ func (w *huffmanBitWriter) writeBlockHuff(eof bool, input []byte, sync bool) {
|
|||
}
|
||||
|
||||
// Add everything as literals
|
||||
estBits := histogramSize(input, w.literalFreq[:], !eof && !sync) + 15
|
||||
// We have to estimate the header size.
|
||||
// Assume header is around 70 bytes:
|
||||
// https://stackoverflow.com/a/25454430
|
||||
const guessHeaderSizeBits = 70 * 8
|
||||
estBits, estExtra := histogramSize(input, w.literalFreq[:], !eof && !sync)
|
||||
estBits += w.lastHeader + 15
|
||||
if w.lastHeader == 0 {
|
||||
estBits += guessHeaderSizeBits
|
||||
}
|
||||
estBits += estBits >> w.logNewTablePenalty
|
||||
|
||||
// Store bytes, if we don't get a reasonable improvement.
|
||||
ssize, storable := w.storedSize(input)
|
||||
if storable && ssize < (estBits+estBits>>4) {
|
||||
if storable && ssize < estBits {
|
||||
w.writeStoredHeader(len(input), eof)
|
||||
w.writeBytes(input)
|
||||
return
|
||||
}
|
||||
|
||||
if w.lastHeader > 0 {
|
||||
size, _ := w.dynamicSize(w.literalEncoding, huffOffset, w.lastHeader)
|
||||
estBits += estBits >> (w.logReusePenalty)
|
||||
reuseSize := w.literalEncoding.bitLength(w.literalFreq[:256])
|
||||
estBits += estExtra
|
||||
|
||||
if estBits < size {
|
||||
if estBits < reuseSize {
|
||||
// We owe an EOB
|
||||
w.writeCode(w.literalEncoding.codes[endBlockMarker])
|
||||
w.lastHeader = 0
|
||||
|
|
|
|||
|
|
@ -7,7 +7,6 @@ package flate
|
|||
import (
|
||||
"math"
|
||||
"math/bits"
|
||||
"sort"
|
||||
)
|
||||
|
||||
const (
|
||||
|
|
@ -25,8 +24,6 @@ type huffmanEncoder struct {
|
|||
codes []hcode
|
||||
freqcache []literalNode
|
||||
bitCount [17]int32
|
||||
lns byLiteral // stored to avoid repeated allocation in generate
|
||||
lfs byFreq // stored to avoid repeated allocation in generate
|
||||
}
|
||||
|
||||
type literalNode struct {
|
||||
|
|
@ -85,17 +82,14 @@ func generateFixedLiteralEncoding() *huffmanEncoder {
|
|||
// size 8, 000110000 .. 10111111
|
||||
bits = ch + 48
|
||||
size = 8
|
||||
break
|
||||
case ch < 256:
|
||||
// size 9, 110010000 .. 111111111
|
||||
bits = ch + 400 - 144
|
||||
size = 9
|
||||
break
|
||||
case ch < 280:
|
||||
// size 7, 0000000 .. 0010111
|
||||
bits = ch - 256
|
||||
size = 7
|
||||
break
|
||||
default:
|
||||
// size 8, 11000000 .. 11000111
|
||||
bits = ch + 192 - 280
|
||||
|
|
@ -115,8 +109,8 @@ func generateFixedOffsetEncoding() *huffmanEncoder {
|
|||
return h
|
||||
}
|
||||
|
||||
var fixedLiteralEncoding *huffmanEncoder = generateFixedLiteralEncoding()
|
||||
var fixedOffsetEncoding *huffmanEncoder = generateFixedOffsetEncoding()
|
||||
var fixedLiteralEncoding = generateFixedLiteralEncoding()
|
||||
var fixedOffsetEncoding = generateFixedOffsetEncoding()
|
||||
|
||||
func (h *huffmanEncoder) bitLength(freq []uint16) int {
|
||||
var total int
|
||||
|
|
@ -273,7 +267,7 @@ func (h *huffmanEncoder) assignEncodingAndSize(bitCount []int32, list []literalN
|
|||
// assigned in literal order (not frequency order).
|
||||
chunk := list[len(list)-int(bits):]
|
||||
|
||||
h.lns.sort(chunk)
|
||||
sortByLiteral(chunk)
|
||||
for _, node := range chunk {
|
||||
h.codes[node.literal] = hcode{code: reverseBits(code, uint8(n)), len: uint16(n)}
|
||||
code++
|
||||
|
|
@ -318,7 +312,7 @@ func (h *huffmanEncoder) generate(freq []uint16, maxBits int32) {
|
|||
}
|
||||
return
|
||||
}
|
||||
h.lfs.sort(list)
|
||||
sortByFreq(list)
|
||||
|
||||
// Get the number of literals for each bit count
|
||||
bitCount := h.bitCounts(list, maxBits)
|
||||
|
|
@ -326,59 +320,44 @@ func (h *huffmanEncoder) generate(freq []uint16, maxBits int32) {
|
|||
h.assignEncodingAndSize(bitCount, list)
|
||||
}
|
||||
|
||||
type byLiteral []literalNode
|
||||
|
||||
func (s *byLiteral) sort(a []literalNode) {
|
||||
*s = byLiteral(a)
|
||||
sort.Sort(s)
|
||||
}
|
||||
|
||||
func (s byLiteral) Len() int { return len(s) }
|
||||
|
||||
func (s byLiteral) Less(i, j int) bool {
|
||||
return s[i].literal < s[j].literal
|
||||
}
|
||||
|
||||
func (s byLiteral) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
|
||||
|
||||
type byFreq []literalNode
|
||||
|
||||
func (s *byFreq) sort(a []literalNode) {
|
||||
*s = byFreq(a)
|
||||
sort.Sort(s)
|
||||
}
|
||||
|
||||
func (s byFreq) Len() int { return len(s) }
|
||||
|
||||
func (s byFreq) Less(i, j int) bool {
|
||||
if s[i].freq == s[j].freq {
|
||||
return s[i].literal < s[j].literal
|
||||
func atLeastOne(v float32) float32 {
|
||||
if v < 1 {
|
||||
return 1
|
||||
}
|
||||
return s[i].freq < s[j].freq
|
||||
return v
|
||||
}
|
||||
|
||||
func (s byFreq) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
|
||||
|
||||
// histogramSize accumulates a histogram of b in h.
|
||||
// An estimated size in bits is returned.
|
||||
// Unassigned values are assigned '1' in the histogram.
|
||||
// len(h) must be >= 256, and h's elements must be all zeroes.
|
||||
func histogramSize(b []byte, h []uint16, fill bool) int {
|
||||
func histogramSize(b []byte, h []uint16, fill bool) (int, int) {
|
||||
h = h[:256]
|
||||
for _, t := range b {
|
||||
h[t]++
|
||||
}
|
||||
invTotal := 1.0 / float64(len(b))
|
||||
shannon := 0.0
|
||||
single := math.Ceil(-math.Log2(invTotal))
|
||||
invTotal := 1.0 / float32(len(b))
|
||||
shannon := float32(0.0)
|
||||
var extra float32
|
||||
if fill {
|
||||
oneBits := atLeastOne(-mFastLog2(invTotal))
|
||||
for i, v := range h[:] {
|
||||
if v > 0 {
|
||||
n := float64(v)
|
||||
shannon += math.Ceil(-math.Log2(n*invTotal) * n)
|
||||
} else if fill {
|
||||
shannon += single
|
||||
n := float32(v)
|
||||
shannon += atLeastOne(-mFastLog2(n*invTotal)) * n
|
||||
} else {
|
||||
h[i] = 1
|
||||
extra += oneBits
|
||||
}
|
||||
}
|
||||
return int(shannon + 0.99)
|
||||
} else {
|
||||
for _, v := range h[:] {
|
||||
if v > 0 {
|
||||
n := float32(v)
|
||||
shannon += atLeastOne(-mFastLog2(n*invTotal)) * n
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
return int(shannon + 0.99), int(extra + 0.99)
|
||||
}
|
||||
|
|
|
|||
|
|
@ -0,0 +1,178 @@
|
|||
// Copyright 2009 The Go Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
package flate
|
||||
|
||||
// Sort sorts data.
|
||||
// It makes one call to data.Len to determine n, and O(n*log(n)) calls to
|
||||
// data.Less and data.Swap. The sort is not guaranteed to be stable.
|
||||
func sortByFreq(data []literalNode) {
|
||||
n := len(data)
|
||||
quickSortByFreq(data, 0, n, maxDepth(n))
|
||||
}
|
||||
|
||||
func quickSortByFreq(data []literalNode, a, b, maxDepth int) {
|
||||
for b-a > 12 { // Use ShellSort for slices <= 12 elements
|
||||
if maxDepth == 0 {
|
||||
heapSort(data, a, b)
|
||||
return
|
||||
}
|
||||
maxDepth--
|
||||
mlo, mhi := doPivotByFreq(data, a, b)
|
||||
// Avoiding recursion on the larger subproblem guarantees
|
||||
// a stack depth of at most lg(b-a).
|
||||
if mlo-a < b-mhi {
|
||||
quickSortByFreq(data, a, mlo, maxDepth)
|
||||
a = mhi // i.e., quickSortByFreq(data, mhi, b)
|
||||
} else {
|
||||
quickSortByFreq(data, mhi, b, maxDepth)
|
||||
b = mlo // i.e., quickSortByFreq(data, a, mlo)
|
||||
}
|
||||
}
|
||||
if b-a > 1 {
|
||||
// Do ShellSort pass with gap 6
|
||||
// It could be written in this simplified form cause b-a <= 12
|
||||
for i := a + 6; i < b; i++ {
|
||||
if data[i].freq == data[i-6].freq && data[i].literal < data[i-6].literal || data[i].freq < data[i-6].freq {
|
||||
data[i], data[i-6] = data[i-6], data[i]
|
||||
}
|
||||
}
|
||||
insertionSortByFreq(data, a, b)
|
||||
}
|
||||
}
|
||||
|
||||
// siftDownByFreq implements the heap property on data[lo, hi).
|
||||
// first is an offset into the array where the root of the heap lies.
|
||||
func siftDownByFreq(data []literalNode, lo, hi, first int) {
|
||||
root := lo
|
||||
for {
|
||||
child := 2*root + 1
|
||||
if child >= hi {
|
||||
break
|
||||
}
|
||||
if child+1 < hi && (data[first+child].freq == data[first+child+1].freq && data[first+child].literal < data[first+child+1].literal || data[first+child].freq < data[first+child+1].freq) {
|
||||
child++
|
||||
}
|
||||
if data[first+root].freq == data[first+child].freq && data[first+root].literal > data[first+child].literal || data[first+root].freq > data[first+child].freq {
|
||||
return
|
||||
}
|
||||
data[first+root], data[first+child] = data[first+child], data[first+root]
|
||||
root = child
|
||||
}
|
||||
}
|
||||
func doPivotByFreq(data []literalNode, lo, hi int) (midlo, midhi int) {
|
||||
m := int(uint(lo+hi) >> 1) // Written like this to avoid integer overflow.
|
||||
if hi-lo > 40 {
|
||||
// Tukey's ``Ninther,'' median of three medians of three.
|
||||
s := (hi - lo) / 8
|
||||
medianOfThreeSortByFreq(data, lo, lo+s, lo+2*s)
|
||||
medianOfThreeSortByFreq(data, m, m-s, m+s)
|
||||
medianOfThreeSortByFreq(data, hi-1, hi-1-s, hi-1-2*s)
|
||||
}
|
||||
medianOfThreeSortByFreq(data, lo, m, hi-1)
|
||||
|
||||
// Invariants are:
|
||||
// data[lo] = pivot (set up by ChoosePivot)
|
||||
// data[lo < i < a] < pivot
|
||||
// data[a <= i < b] <= pivot
|
||||
// data[b <= i < c] unexamined
|
||||
// data[c <= i < hi-1] > pivot
|
||||
// data[hi-1] >= pivot
|
||||
pivot := lo
|
||||
a, c := lo+1, hi-1
|
||||
|
||||
for ; a < c && (data[a].freq == data[pivot].freq && data[a].literal < data[pivot].literal || data[a].freq < data[pivot].freq); a++ {
|
||||
}
|
||||
b := a
|
||||
for {
|
||||
for ; b < c && (data[pivot].freq == data[b].freq && data[pivot].literal > data[b].literal || data[pivot].freq > data[b].freq); b++ { // data[b] <= pivot
|
||||
}
|
||||
for ; b < c && (data[pivot].freq == data[c-1].freq && data[pivot].literal < data[c-1].literal || data[pivot].freq < data[c-1].freq); c-- { // data[c-1] > pivot
|
||||
}
|
||||
if b >= c {
|
||||
break
|
||||
}
|
||||
// data[b] > pivot; data[c-1] <= pivot
|
||||
data[b], data[c-1] = data[c-1], data[b]
|
||||
b++
|
||||
c--
|
||||
}
|
||||
// If hi-c<3 then there are duplicates (by property of median of nine).
|
||||
// Let's be a bit more conservative, and set border to 5.
|
||||
protect := hi-c < 5
|
||||
if !protect && hi-c < (hi-lo)/4 {
|
||||
// Lets test some points for equality to pivot
|
||||
dups := 0
|
||||
if data[pivot].freq == data[hi-1].freq && data[pivot].literal > data[hi-1].literal || data[pivot].freq > data[hi-1].freq { // data[hi-1] = pivot
|
||||
data[c], data[hi-1] = data[hi-1], data[c]
|
||||
c++
|
||||
dups++
|
||||
}
|
||||
if data[b-1].freq == data[pivot].freq && data[b-1].literal > data[pivot].literal || data[b-1].freq > data[pivot].freq { // data[b-1] = pivot
|
||||
b--
|
||||
dups++
|
||||
}
|
||||
// m-lo = (hi-lo)/2 > 6
|
||||
// b-lo > (hi-lo)*3/4-1 > 8
|
||||
// ==> m < b ==> data[m] <= pivot
|
||||
if data[m].freq == data[pivot].freq && data[m].literal > data[pivot].literal || data[m].freq > data[pivot].freq { // data[m] = pivot
|
||||
data[m], data[b-1] = data[b-1], data[m]
|
||||
b--
|
||||
dups++
|
||||
}
|
||||
// if at least 2 points are equal to pivot, assume skewed distribution
|
||||
protect = dups > 1
|
||||
}
|
||||
if protect {
|
||||
// Protect against a lot of duplicates
|
||||
// Add invariant:
|
||||
// data[a <= i < b] unexamined
|
||||
// data[b <= i < c] = pivot
|
||||
for {
|
||||
for ; a < b && (data[b-1].freq == data[pivot].freq && data[b-1].literal > data[pivot].literal || data[b-1].freq > data[pivot].freq); b-- { // data[b] == pivot
|
||||
}
|
||||
for ; a < b && (data[a].freq == data[pivot].freq && data[a].literal < data[pivot].literal || data[a].freq < data[pivot].freq); a++ { // data[a] < pivot
|
||||
}
|
||||
if a >= b {
|
||||
break
|
||||
}
|
||||
// data[a] == pivot; data[b-1] < pivot
|
||||
data[a], data[b-1] = data[b-1], data[a]
|
||||
a++
|
||||
b--
|
||||
}
|
||||
}
|
||||
// Swap pivot into middle
|
||||
data[pivot], data[b-1] = data[b-1], data[pivot]
|
||||
return b - 1, c
|
||||
}
|
||||
|
||||
// Insertion sort
|
||||
func insertionSortByFreq(data []literalNode, a, b int) {
|
||||
for i := a + 1; i < b; i++ {
|
||||
for j := i; j > a && (data[j].freq == data[j-1].freq && data[j].literal < data[j-1].literal || data[j].freq < data[j-1].freq); j-- {
|
||||
data[j], data[j-1] = data[j-1], data[j]
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// quickSortByFreq, loosely following Bentley and McIlroy,
|
||||
// ``Engineering a Sort Function,'' SP&E November 1993.
|
||||
|
||||
// medianOfThreeSortByFreq moves the median of the three values data[m0], data[m1], data[m2] into data[m1].
|
||||
func medianOfThreeSortByFreq(data []literalNode, m1, m0, m2 int) {
|
||||
// sort 3 elements
|
||||
if data[m1].freq == data[m0].freq && data[m1].literal < data[m0].literal || data[m1].freq < data[m0].freq {
|
||||
data[m1], data[m0] = data[m0], data[m1]
|
||||
}
|
||||
// data[m0] <= data[m1]
|
||||
if data[m2].freq == data[m1].freq && data[m2].literal < data[m1].literal || data[m2].freq < data[m1].freq {
|
||||
data[m2], data[m1] = data[m1], data[m2]
|
||||
// data[m0] <= data[m2] && data[m1] < data[m2]
|
||||
if data[m1].freq == data[m0].freq && data[m1].literal < data[m0].literal || data[m1].freq < data[m0].freq {
|
||||
data[m1], data[m0] = data[m0], data[m1]
|
||||
}
|
||||
}
|
||||
// now data[m0] <= data[m1] <= data[m2]
|
||||
}
|
||||
201
vendor/github.com/klauspost/compress/flate/huffman_sortByLiteral.go
generated
vendored
Normal file
201
vendor/github.com/klauspost/compress/flate/huffman_sortByLiteral.go
generated
vendored
Normal file
|
|
@ -0,0 +1,201 @@
|
|||
// Copyright 2009 The Go Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
package flate
|
||||
|
||||
// Sort sorts data.
|
||||
// It makes one call to data.Len to determine n, and O(n*log(n)) calls to
|
||||
// data.Less and data.Swap. The sort is not guaranteed to be stable.
|
||||
func sortByLiteral(data []literalNode) {
|
||||
n := len(data)
|
||||
quickSort(data, 0, n, maxDepth(n))
|
||||
}
|
||||
|
||||
func quickSort(data []literalNode, a, b, maxDepth int) {
|
||||
for b-a > 12 { // Use ShellSort for slices <= 12 elements
|
||||
if maxDepth == 0 {
|
||||
heapSort(data, a, b)
|
||||
return
|
||||
}
|
||||
maxDepth--
|
||||
mlo, mhi := doPivot(data, a, b)
|
||||
// Avoiding recursion on the larger subproblem guarantees
|
||||
// a stack depth of at most lg(b-a).
|
||||
if mlo-a < b-mhi {
|
||||
quickSort(data, a, mlo, maxDepth)
|
||||
a = mhi // i.e., quickSort(data, mhi, b)
|
||||
} else {
|
||||
quickSort(data, mhi, b, maxDepth)
|
||||
b = mlo // i.e., quickSort(data, a, mlo)
|
||||
}
|
||||
}
|
||||
if b-a > 1 {
|
||||
// Do ShellSort pass with gap 6
|
||||
// It could be written in this simplified form cause b-a <= 12
|
||||
for i := a + 6; i < b; i++ {
|
||||
if data[i].literal < data[i-6].literal {
|
||||
data[i], data[i-6] = data[i-6], data[i]
|
||||
}
|
||||
}
|
||||
insertionSort(data, a, b)
|
||||
}
|
||||
}
|
||||
func heapSort(data []literalNode, a, b int) {
|
||||
first := a
|
||||
lo := 0
|
||||
hi := b - a
|
||||
|
||||
// Build heap with greatest element at top.
|
||||
for i := (hi - 1) / 2; i >= 0; i-- {
|
||||
siftDown(data, i, hi, first)
|
||||
}
|
||||
|
||||
// Pop elements, largest first, into end of data.
|
||||
for i := hi - 1; i >= 0; i-- {
|
||||
data[first], data[first+i] = data[first+i], data[first]
|
||||
siftDown(data, lo, i, first)
|
||||
}
|
||||
}
|
||||
|
||||
// siftDown implements the heap property on data[lo, hi).
|
||||
// first is an offset into the array where the root of the heap lies.
|
||||
func siftDown(data []literalNode, lo, hi, first int) {
|
||||
root := lo
|
||||
for {
|
||||
child := 2*root + 1
|
||||
if child >= hi {
|
||||
break
|
||||
}
|
||||
if child+1 < hi && data[first+child].literal < data[first+child+1].literal {
|
||||
child++
|
||||
}
|
||||
if data[first+root].literal > data[first+child].literal {
|
||||
return
|
||||
}
|
||||
data[first+root], data[first+child] = data[first+child], data[first+root]
|
||||
root = child
|
||||
}
|
||||
}
|
||||
func doPivot(data []literalNode, lo, hi int) (midlo, midhi int) {
|
||||
m := int(uint(lo+hi) >> 1) // Written like this to avoid integer overflow.
|
||||
if hi-lo > 40 {
|
||||
// Tukey's ``Ninther,'' median of three medians of three.
|
||||
s := (hi - lo) / 8
|
||||
medianOfThree(data, lo, lo+s, lo+2*s)
|
||||
medianOfThree(data, m, m-s, m+s)
|
||||
medianOfThree(data, hi-1, hi-1-s, hi-1-2*s)
|
||||
}
|
||||
medianOfThree(data, lo, m, hi-1)
|
||||
|
||||
// Invariants are:
|
||||
// data[lo] = pivot (set up by ChoosePivot)
|
||||
// data[lo < i < a] < pivot
|
||||
// data[a <= i < b] <= pivot
|
||||
// data[b <= i < c] unexamined
|
||||
// data[c <= i < hi-1] > pivot
|
||||
// data[hi-1] >= pivot
|
||||
pivot := lo
|
||||
a, c := lo+1, hi-1
|
||||
|
||||
for ; a < c && data[a].literal < data[pivot].literal; a++ {
|
||||
}
|
||||
b := a
|
||||
for {
|
||||
for ; b < c && data[pivot].literal > data[b].literal; b++ { // data[b] <= pivot
|
||||
}
|
||||
for ; b < c && data[pivot].literal < data[c-1].literal; c-- { // data[c-1] > pivot
|
||||
}
|
||||
if b >= c {
|
||||
break
|
||||
}
|
||||
// data[b] > pivot; data[c-1] <= pivot
|
||||
data[b], data[c-1] = data[c-1], data[b]
|
||||
b++
|
||||
c--
|
||||
}
|
||||
// If hi-c<3 then there are duplicates (by property of median of nine).
|
||||
// Let's be a bit more conservative, and set border to 5.
|
||||
protect := hi-c < 5
|
||||
if !protect && hi-c < (hi-lo)/4 {
|
||||
// Lets test some points for equality to pivot
|
||||
dups := 0
|
||||
if data[pivot].literal > data[hi-1].literal { // data[hi-1] = pivot
|
||||
data[c], data[hi-1] = data[hi-1], data[c]
|
||||
c++
|
||||
dups++
|
||||
}
|
||||
if data[b-1].literal > data[pivot].literal { // data[b-1] = pivot
|
||||
b--
|
||||
dups++
|
||||
}
|
||||
// m-lo = (hi-lo)/2 > 6
|
||||
// b-lo > (hi-lo)*3/4-1 > 8
|
||||
// ==> m < b ==> data[m] <= pivot
|
||||
if data[m].literal > data[pivot].literal { // data[m] = pivot
|
||||
data[m], data[b-1] = data[b-1], data[m]
|
||||
b--
|
||||
dups++
|
||||
}
|
||||
// if at least 2 points are equal to pivot, assume skewed distribution
|
||||
protect = dups > 1
|
||||
}
|
||||
if protect {
|
||||
// Protect against a lot of duplicates
|
||||
// Add invariant:
|
||||
// data[a <= i < b] unexamined
|
||||
// data[b <= i < c] = pivot
|
||||
for {
|
||||
for ; a < b && data[b-1].literal > data[pivot].literal; b-- { // data[b] == pivot
|
||||
}
|
||||
for ; a < b && data[a].literal < data[pivot].literal; a++ { // data[a] < pivot
|
||||
}
|
||||
if a >= b {
|
||||
break
|
||||
}
|
||||
// data[a] == pivot; data[b-1] < pivot
|
||||
data[a], data[b-1] = data[b-1], data[a]
|
||||
a++
|
||||
b--
|
||||
}
|
||||
}
|
||||
// Swap pivot into middle
|
||||
data[pivot], data[b-1] = data[b-1], data[pivot]
|
||||
return b - 1, c
|
||||
}
|
||||
|
||||
// Insertion sort
|
||||
func insertionSort(data []literalNode, a, b int) {
|
||||
for i := a + 1; i < b; i++ {
|
||||
for j := i; j > a && data[j].literal < data[j-1].literal; j-- {
|
||||
data[j], data[j-1] = data[j-1], data[j]
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// maxDepth returns a threshold at which quicksort should switch
|
||||
// to heapsort. It returns 2*ceil(lg(n+1)).
|
||||
func maxDepth(n int) int {
|
||||
var depth int
|
||||
for i := n; i > 0; i >>= 1 {
|
||||
depth++
|
||||
}
|
||||
return depth * 2
|
||||
}
|
||||
|
||||
// medianOfThree moves the median of the three values data[m0], data[m1], data[m2] into data[m1].
|
||||
func medianOfThree(data []literalNode, m1, m0, m2 int) {
|
||||
// sort 3 elements
|
||||
if data[m1].literal < data[m0].literal {
|
||||
data[m1], data[m0] = data[m0], data[m1]
|
||||
}
|
||||
// data[m0] <= data[m1]
|
||||
if data[m2].literal < data[m1].literal {
|
||||
data[m2], data[m1] = data[m1], data[m2]
|
||||
// data[m0] <= data[m2] && data[m1] < data[m2]
|
||||
if data[m1].literal < data[m0].literal {
|
||||
data[m1], data[m0] = data[m0], data[m1]
|
||||
}
|
||||
}
|
||||
// now data[m0] <= data[m1] <= data[m2]
|
||||
}
|
||||
|
|
@ -106,7 +106,7 @@ const (
|
|||
)
|
||||
|
||||
type huffmanDecoder struct {
|
||||
min int // the minimum code length
|
||||
maxRead int // the maximum number of bits we can read and not overread
|
||||
chunks *[huffmanNumChunks]uint16 // chunks as described above
|
||||
links [][]uint16 // overflow links
|
||||
linkMask uint32 // mask the width of the link table
|
||||
|
|
@ -126,12 +126,12 @@ func (h *huffmanDecoder) init(lengths []int) bool {
|
|||
if h.chunks == nil {
|
||||
h.chunks = &[huffmanNumChunks]uint16{}
|
||||
}
|
||||
if h.min != 0 {
|
||||
if h.maxRead != 0 {
|
||||
*h = huffmanDecoder{chunks: h.chunks, links: h.links}
|
||||
}
|
||||
|
||||
// Count number of codes of each length,
|
||||
// compute min and max length.
|
||||
// compute maxRead and max length.
|
||||
var count [maxCodeLen]int
|
||||
var min, max int
|
||||
for _, n := range lengths {
|
||||
|
|
@ -178,7 +178,7 @@ func (h *huffmanDecoder) init(lengths []int) bool {
|
|||
return false
|
||||
}
|
||||
|
||||
h.min = min
|
||||
h.maxRead = min
|
||||
chunks := h.chunks[:]
|
||||
for i := range chunks {
|
||||
chunks[i] = 0
|
||||
|
|
@ -342,7 +342,7 @@ func (f *decompressor) nextBlock() {
|
|||
// compressed, fixed Huffman tables
|
||||
f.hl = &fixedHuffmanDecoder
|
||||
f.hd = nil
|
||||
f.huffmanBlock()
|
||||
f.huffmanBlockDecoder()()
|
||||
case 2:
|
||||
// compressed, dynamic Huffman tables
|
||||
if f.err = f.readHuffman(); f.err != nil {
|
||||
|
|
@ -350,7 +350,7 @@ func (f *decompressor) nextBlock() {
|
|||
}
|
||||
f.hl = &f.h1
|
||||
f.hd = &f.h2
|
||||
f.huffmanBlock()
|
||||
f.huffmanBlockDecoder()()
|
||||
default:
|
||||
// 3 is reserved.
|
||||
if debugDecode {
|
||||
|
|
@ -543,12 +543,18 @@ func (f *decompressor) readHuffman() error {
|
|||
return CorruptInputError(f.roffset)
|
||||
}
|
||||
|
||||
// As an optimization, we can initialize the min bits to read at a time
|
||||
// As an optimization, we can initialize the maxRead bits to read at a time
|
||||
// for the HLIT tree to the length of the EOB marker since we know that
|
||||
// every block must terminate with one. This preserves the property that
|
||||
// we never read any extra bytes after the end of the DEFLATE stream.
|
||||
if f.h1.min < f.bits[endBlockMarker] {
|
||||
f.h1.min = f.bits[endBlockMarker]
|
||||
if f.h1.maxRead < f.bits[endBlockMarker] {
|
||||
f.h1.maxRead = f.bits[endBlockMarker]
|
||||
}
|
||||
if !f.final {
|
||||
// If not the final block, the smallest block possible is
|
||||
// a predefined table, BTYPE=01, with a single EOB marker.
|
||||
// This will take up 3 + 7 bits.
|
||||
f.h1.maxRead += 10
|
||||
}
|
||||
|
||||
return nil
|
||||
|
|
@ -558,7 +564,7 @@ func (f *decompressor) readHuffman() error {
|
|||
// hl and hd are the Huffman states for the lit/length values
|
||||
// and the distance values, respectively. If hd == nil, using the
|
||||
// fixed distance encoding associated with fixed Huffman blocks.
|
||||
func (f *decompressor) huffmanBlock() {
|
||||
func (f *decompressor) huffmanBlockGeneric() {
|
||||
const (
|
||||
stateInit = iota // Zero value must be stateInit
|
||||
stateDict
|
||||
|
|
@ -574,19 +580,64 @@ func (f *decompressor) huffmanBlock() {
|
|||
readLiteral:
|
||||
// Read literal and/or (length, distance) according to RFC section 3.2.3.
|
||||
{
|
||||
v, err := f.huffSym(f.hl)
|
||||
var v int
|
||||
{
|
||||
// Inlined v, err := f.huffSym(f.hl)
|
||||
// Since a huffmanDecoder can be empty or be composed of a degenerate tree
|
||||
// with single element, huffSym must error on these two edge cases. In both
|
||||
// cases, the chunks slice will be 0 for the invalid sequence, leading it
|
||||
// satisfy the n == 0 check below.
|
||||
n := uint(f.hl.maxRead)
|
||||
// Optimization. Compiler isn't smart enough to keep f.b,f.nb in registers,
|
||||
// but is smart enough to keep local variables in registers, so use nb and b,
|
||||
// inline call to moreBits and reassign b,nb back to f on return.
|
||||
nb, b := f.nb, f.b
|
||||
for {
|
||||
for nb < n {
|
||||
c, err := f.r.ReadByte()
|
||||
if err != nil {
|
||||
f.err = err
|
||||
f.b = b
|
||||
f.nb = nb
|
||||
f.err = noEOF(err)
|
||||
return
|
||||
}
|
||||
f.roffset++
|
||||
b |= uint32(c) << (nb & 31)
|
||||
nb += 8
|
||||
}
|
||||
chunk := f.hl.chunks[b&(huffmanNumChunks-1)]
|
||||
n = uint(chunk & huffmanCountMask)
|
||||
if n > huffmanChunkBits {
|
||||
chunk = f.hl.links[chunk>>huffmanValueShift][(b>>huffmanChunkBits)&f.hl.linkMask]
|
||||
n = uint(chunk & huffmanCountMask)
|
||||
}
|
||||
if n <= nb {
|
||||
if n == 0 {
|
||||
f.b = b
|
||||
f.nb = nb
|
||||
if debugDecode {
|
||||
fmt.Println("huffsym: n==0")
|
||||
}
|
||||
f.err = CorruptInputError(f.roffset)
|
||||
return
|
||||
}
|
||||
f.b = b >> (n & 31)
|
||||
f.nb = nb - n
|
||||
v = int(chunk >> huffmanValueShift)
|
||||
break
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
var n uint // number of bits extra
|
||||
var length int
|
||||
var err error
|
||||
switch {
|
||||
case v < 256:
|
||||
f.dict.writeByte(byte(v))
|
||||
if f.dict.availWrite() == 0 {
|
||||
f.toRead = f.dict.readFlush()
|
||||
f.step = (*decompressor).huffmanBlock
|
||||
f.step = (*decompressor).huffmanBlockGeneric
|
||||
f.stepState = stateInit
|
||||
return
|
||||
}
|
||||
|
|
@ -714,7 +765,7 @@ copyHistory:
|
|||
|
||||
if f.dict.availWrite() == 0 || f.copyLen > 0 {
|
||||
f.toRead = f.dict.readFlush()
|
||||
f.step = (*decompressor).huffmanBlock // We need to continue this work
|
||||
f.step = (*decompressor).huffmanBlockGeneric // We need to continue this work
|
||||
f.stepState = stateDict
|
||||
return
|
||||
}
|
||||
|
|
@ -726,21 +777,33 @@ copyHistory:
|
|||
func (f *decompressor) dataBlock() {
|
||||
// Uncompressed.
|
||||
// Discard current half-byte.
|
||||
f.nb = 0
|
||||
f.b = 0
|
||||
left := (f.nb) & 7
|
||||
f.nb -= left
|
||||
f.b >>= left
|
||||
|
||||
offBytes := f.nb >> 3
|
||||
// Unfilled values will be overwritten.
|
||||
f.buf[0] = uint8(f.b)
|
||||
f.buf[1] = uint8(f.b >> 8)
|
||||
f.buf[2] = uint8(f.b >> 16)
|
||||
f.buf[3] = uint8(f.b >> 24)
|
||||
|
||||
f.roffset += int64(offBytes)
|
||||
f.nb, f.b = 0, 0
|
||||
|
||||
// Length then ones-complement of length.
|
||||
nr, err := io.ReadFull(f.r, f.buf[0:4])
|
||||
nr, err := io.ReadFull(f.r, f.buf[offBytes:4])
|
||||
f.roffset += int64(nr)
|
||||
if err != nil {
|
||||
f.err = noEOF(err)
|
||||
return
|
||||
}
|
||||
n := int(f.buf[0]) | int(f.buf[1])<<8
|
||||
nn := int(f.buf[2]) | int(f.buf[3])<<8
|
||||
if uint16(nn) != uint16(^n) {
|
||||
n := uint16(f.buf[0]) | uint16(f.buf[1])<<8
|
||||
nn := uint16(f.buf[2]) | uint16(f.buf[3])<<8
|
||||
if nn != ^n {
|
||||
if debugDecode {
|
||||
fmt.Println("uint16(nn) != uint16(^n)", nn, ^n)
|
||||
ncomp := ^n
|
||||
fmt.Println("uint16(nn) != uint16(^n)", nn, ncomp)
|
||||
}
|
||||
f.err = CorruptInputError(f.roffset)
|
||||
return
|
||||
|
|
@ -752,7 +815,7 @@ func (f *decompressor) dataBlock() {
|
|||
return
|
||||
}
|
||||
|
||||
f.copyLen = n
|
||||
f.copyLen = int(n)
|
||||
f.copyData()
|
||||
}
|
||||
|
||||
|
|
@ -816,7 +879,7 @@ func (f *decompressor) huffSym(h *huffmanDecoder) (int, error) {
|
|||
// with single element, huffSym must error on these two edge cases. In both
|
||||
// cases, the chunks slice will be 0 for the invalid sequence, leading it
|
||||
// satisfy the n == 0 check below.
|
||||
n := uint(h.min)
|
||||
n := uint(h.maxRead)
|
||||
// Optimization. Compiler isn't smart enough to keep f.b,f.nb in registers,
|
||||
// but is smart enough to keep local variables in registers, so use nb and b,
|
||||
// inline call to moreBits and reassign b,nb back to f on return.
|
||||
|
|
|
|||
|
|
@ -0,0 +1,922 @@
|
|||
// Code generated by go generate gen_inflate.go. DO NOT EDIT.
|
||||
|
||||
package flate
|
||||
|
||||
import (
|
||||
"bufio"
|
||||
"bytes"
|
||||
"fmt"
|
||||
"math/bits"
|
||||
"strings"
|
||||
)
|
||||
|
||||
// Decode a single Huffman block from f.
|
||||
// hl and hd are the Huffman states for the lit/length values
|
||||
// and the distance values, respectively. If hd == nil, using the
|
||||
// fixed distance encoding associated with fixed Huffman blocks.
|
||||
func (f *decompressor) huffmanBytesBuffer() {
|
||||
const (
|
||||
stateInit = iota // Zero value must be stateInit
|
||||
stateDict
|
||||
)
|
||||
fr := f.r.(*bytes.Buffer)
|
||||
moreBits := func() error {
|
||||
c, err := fr.ReadByte()
|
||||
if err != nil {
|
||||
return noEOF(err)
|
||||
}
|
||||
f.roffset++
|
||||
f.b |= uint32(c) << f.nb
|
||||
f.nb += 8
|
||||
return nil
|
||||
}
|
||||
|
||||
switch f.stepState {
|
||||
case stateInit:
|
||||
goto readLiteral
|
||||
case stateDict:
|
||||
goto copyHistory
|
||||
}
|
||||
|
||||
readLiteral:
|
||||
// Read literal and/or (length, distance) according to RFC section 3.2.3.
|
||||
{
|
||||
var v int
|
||||
{
|
||||
// Inlined v, err := f.huffSym(f.hl)
|
||||
// Since a huffmanDecoder can be empty or be composed of a degenerate tree
|
||||
// with single element, huffSym must error on these two edge cases. In both
|
||||
// cases, the chunks slice will be 0 for the invalid sequence, leading it
|
||||
// satisfy the n == 0 check below.
|
||||
n := uint(f.hl.maxRead)
|
||||
// Optimization. Compiler isn't smart enough to keep f.b,f.nb in registers,
|
||||
// but is smart enough to keep local variables in registers, so use nb and b,
|
||||
// inline call to moreBits and reassign b,nb back to f on return.
|
||||
nb, b := f.nb, f.b
|
||||
for {
|
||||
for nb < n {
|
||||
c, err := fr.ReadByte()
|
||||
if err != nil {
|
||||
f.b = b
|
||||
f.nb = nb
|
||||
f.err = noEOF(err)
|
||||
return
|
||||
}
|
||||
f.roffset++
|
||||
b |= uint32(c) << (nb & 31)
|
||||
nb += 8
|
||||
}
|
||||
chunk := f.hl.chunks[b&(huffmanNumChunks-1)]
|
||||
n = uint(chunk & huffmanCountMask)
|
||||
if n > huffmanChunkBits {
|
||||
chunk = f.hl.links[chunk>>huffmanValueShift][(b>>huffmanChunkBits)&f.hl.linkMask]
|
||||
n = uint(chunk & huffmanCountMask)
|
||||
}
|
||||
if n <= nb {
|
||||
if n == 0 {
|
||||
f.b = b
|
||||
f.nb = nb
|
||||
if debugDecode {
|
||||
fmt.Println("huffsym: n==0")
|
||||
}
|
||||
f.err = CorruptInputError(f.roffset)
|
||||
return
|
||||
}
|
||||
f.b = b >> (n & 31)
|
||||
f.nb = nb - n
|
||||
v = int(chunk >> huffmanValueShift)
|
||||
break
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
var n uint // number of bits extra
|
||||
var length int
|
||||
var err error
|
||||
switch {
|
||||
case v < 256:
|
||||
f.dict.writeByte(byte(v))
|
||||
if f.dict.availWrite() == 0 {
|
||||
f.toRead = f.dict.readFlush()
|
||||
f.step = (*decompressor).huffmanBytesBuffer
|
||||
f.stepState = stateInit
|
||||
return
|
||||
}
|
||||
goto readLiteral
|
||||
case v == 256:
|
||||
f.finishBlock()
|
||||
return
|
||||
// otherwise, reference to older data
|
||||
case v < 265:
|
||||
length = v - (257 - 3)
|
||||
n = 0
|
||||
case v < 269:
|
||||
length = v*2 - (265*2 - 11)
|
||||
n = 1
|
||||
case v < 273:
|
||||
length = v*4 - (269*4 - 19)
|
||||
n = 2
|
||||
case v < 277:
|
||||
length = v*8 - (273*8 - 35)
|
||||
n = 3
|
||||
case v < 281:
|
||||
length = v*16 - (277*16 - 67)
|
||||
n = 4
|
||||
case v < 285:
|
||||
length = v*32 - (281*32 - 131)
|
||||
n = 5
|
||||
case v < maxNumLit:
|
||||
length = 258
|
||||
n = 0
|
||||
default:
|
||||
if debugDecode {
|
||||
fmt.Println(v, ">= maxNumLit")
|
||||
}
|
||||
f.err = CorruptInputError(f.roffset)
|
||||
return
|
||||
}
|
||||
if n > 0 {
|
||||
for f.nb < n {
|
||||
if err = moreBits(); err != nil {
|
||||
if debugDecode {
|
||||
fmt.Println("morebits n>0:", err)
|
||||
}
|
||||
f.err = err
|
||||
return
|
||||
}
|
||||
}
|
||||
length += int(f.b & uint32(1<<n-1))
|
||||
f.b >>= n
|
||||
f.nb -= n
|
||||
}
|
||||
|
||||
var dist int
|
||||
if f.hd == nil {
|
||||
for f.nb < 5 {
|
||||
if err = moreBits(); err != nil {
|
||||
if debugDecode {
|
||||
fmt.Println("morebits f.nb<5:", err)
|
||||
}
|
||||
f.err = err
|
||||
return
|
||||
}
|
||||
}
|
||||
dist = int(bits.Reverse8(uint8(f.b & 0x1F << 3)))
|
||||
f.b >>= 5
|
||||
f.nb -= 5
|
||||
} else {
|
||||
if dist, err = f.huffSym(f.hd); err != nil {
|
||||
if debugDecode {
|
||||
fmt.Println("huffsym:", err)
|
||||
}
|
||||
f.err = err
|
||||
return
|
||||
}
|
||||
}
|
||||
|
||||
switch {
|
||||
case dist < 4:
|
||||
dist++
|
||||
case dist < maxNumDist:
|
||||
nb := uint(dist-2) >> 1
|
||||
// have 1 bit in bottom of dist, need nb more.
|
||||
extra := (dist & 1) << nb
|
||||
for f.nb < nb {
|
||||
if err = moreBits(); err != nil {
|
||||
if debugDecode {
|
||||
fmt.Println("morebits f.nb<nb:", err)
|
||||
}
|
||||
f.err = err
|
||||
return
|
||||
}
|
||||
}
|
||||
extra |= int(f.b & uint32(1<<nb-1))
|
||||
f.b >>= nb
|
||||
f.nb -= nb
|
||||
dist = 1<<(nb+1) + 1 + extra
|
||||
default:
|
||||
if debugDecode {
|
||||
fmt.Println("dist too big:", dist, maxNumDist)
|
||||
}
|
||||
f.err = CorruptInputError(f.roffset)
|
||||
return
|
||||
}
|
||||
|
||||
// No check on length; encoding can be prescient.
|
||||
if dist > f.dict.histSize() {
|
||||
if debugDecode {
|
||||
fmt.Println("dist > f.dict.histSize():", dist, f.dict.histSize())
|
||||
}
|
||||
f.err = CorruptInputError(f.roffset)
|
||||
return
|
||||
}
|
||||
|
||||
f.copyLen, f.copyDist = length, dist
|
||||
goto copyHistory
|
||||
}
|
||||
|
||||
copyHistory:
|
||||
// Perform a backwards copy according to RFC section 3.2.3.
|
||||
{
|
||||
cnt := f.dict.tryWriteCopy(f.copyDist, f.copyLen)
|
||||
if cnt == 0 {
|
||||
cnt = f.dict.writeCopy(f.copyDist, f.copyLen)
|
||||
}
|
||||
f.copyLen -= cnt
|
||||
|
||||
if f.dict.availWrite() == 0 || f.copyLen > 0 {
|
||||
f.toRead = f.dict.readFlush()
|
||||
f.step = (*decompressor).huffmanBytesBuffer // We need to continue this work
|
||||
f.stepState = stateDict
|
||||
return
|
||||
}
|
||||
goto readLiteral
|
||||
}
|
||||
}
|
||||
|
||||
// Decode a single Huffman block from f.
|
||||
// hl and hd are the Huffman states for the lit/length values
|
||||
// and the distance values, respectively. If hd == nil, using the
|
||||
// fixed distance encoding associated with fixed Huffman blocks.
|
||||
func (f *decompressor) huffmanBytesReader() {
|
||||
const (
|
||||
stateInit = iota // Zero value must be stateInit
|
||||
stateDict
|
||||
)
|
||||
fr := f.r.(*bytes.Reader)
|
||||
moreBits := func() error {
|
||||
c, err := fr.ReadByte()
|
||||
if err != nil {
|
||||
return noEOF(err)
|
||||
}
|
||||
f.roffset++
|
||||
f.b |= uint32(c) << f.nb
|
||||
f.nb += 8
|
||||
return nil
|
||||
}
|
||||
|
||||
switch f.stepState {
|
||||
case stateInit:
|
||||
goto readLiteral
|
||||
case stateDict:
|
||||
goto copyHistory
|
||||
}
|
||||
|
||||
readLiteral:
|
||||
// Read literal and/or (length, distance) according to RFC section 3.2.3.
|
||||
{
|
||||
var v int
|
||||
{
|
||||
// Inlined v, err := f.huffSym(f.hl)
|
||||
// Since a huffmanDecoder can be empty or be composed of a degenerate tree
|
||||
// with single element, huffSym must error on these two edge cases. In both
|
||||
// cases, the chunks slice will be 0 for the invalid sequence, leading it
|
||||
// satisfy the n == 0 check below.
|
||||
n := uint(f.hl.maxRead)
|
||||
// Optimization. Compiler isn't smart enough to keep f.b,f.nb in registers,
|
||||
// but is smart enough to keep local variables in registers, so use nb and b,
|
||||
// inline call to moreBits and reassign b,nb back to f on return.
|
||||
nb, b := f.nb, f.b
|
||||
for {
|
||||
for nb < n {
|
||||
c, err := fr.ReadByte()
|
||||
if err != nil {
|
||||
f.b = b
|
||||
f.nb = nb
|
||||
f.err = noEOF(err)
|
||||
return
|
||||
}
|
||||
f.roffset++
|
||||
b |= uint32(c) << (nb & 31)
|
||||
nb += 8
|
||||
}
|
||||
chunk := f.hl.chunks[b&(huffmanNumChunks-1)]
|
||||
n = uint(chunk & huffmanCountMask)
|
||||
if n > huffmanChunkBits {
|
||||
chunk = f.hl.links[chunk>>huffmanValueShift][(b>>huffmanChunkBits)&f.hl.linkMask]
|
||||
n = uint(chunk & huffmanCountMask)
|
||||
}
|
||||
if n <= nb {
|
||||
if n == 0 {
|
||||
f.b = b
|
||||
f.nb = nb
|
||||
if debugDecode {
|
||||
fmt.Println("huffsym: n==0")
|
||||
}
|
||||
f.err = CorruptInputError(f.roffset)
|
||||
return
|
||||
}
|
||||
f.b = b >> (n & 31)
|
||||
f.nb = nb - n
|
||||
v = int(chunk >> huffmanValueShift)
|
||||
break
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
var n uint // number of bits extra
|
||||
var length int
|
||||
var err error
|
||||
switch {
|
||||
case v < 256:
|
||||
f.dict.writeByte(byte(v))
|
||||
if f.dict.availWrite() == 0 {
|
||||
f.toRead = f.dict.readFlush()
|
||||
f.step = (*decompressor).huffmanBytesReader
|
||||
f.stepState = stateInit
|
||||
return
|
||||
}
|
||||
goto readLiteral
|
||||
case v == 256:
|
||||
f.finishBlock()
|
||||
return
|
||||
// otherwise, reference to older data
|
||||
case v < 265:
|
||||
length = v - (257 - 3)
|
||||
n = 0
|
||||
case v < 269:
|
||||
length = v*2 - (265*2 - 11)
|
||||
n = 1
|
||||
case v < 273:
|
||||
length = v*4 - (269*4 - 19)
|
||||
n = 2
|
||||
case v < 277:
|
||||
length = v*8 - (273*8 - 35)
|
||||
n = 3
|
||||
case v < 281:
|
||||
length = v*16 - (277*16 - 67)
|
||||
n = 4
|
||||
case v < 285:
|
||||
length = v*32 - (281*32 - 131)
|
||||
n = 5
|
||||
case v < maxNumLit:
|
||||
length = 258
|
||||
n = 0
|
||||
default:
|
||||
if debugDecode {
|
||||
fmt.Println(v, ">= maxNumLit")
|
||||
}
|
||||
f.err = CorruptInputError(f.roffset)
|
||||
return
|
||||
}
|
||||
if n > 0 {
|
||||
for f.nb < n {
|
||||
if err = moreBits(); err != nil {
|
||||
if debugDecode {
|
||||
fmt.Println("morebits n>0:", err)
|
||||
}
|
||||
f.err = err
|
||||
return
|
||||
}
|
||||
}
|
||||
length += int(f.b & uint32(1<<n-1))
|
||||
f.b >>= n
|
||||
f.nb -= n
|
||||
}
|
||||
|
||||
var dist int
|
||||
if f.hd == nil {
|
||||
for f.nb < 5 {
|
||||
if err = moreBits(); err != nil {
|
||||
if debugDecode {
|
||||
fmt.Println("morebits f.nb<5:", err)
|
||||
}
|
||||
f.err = err
|
||||
return
|
||||
}
|
||||
}
|
||||
dist = int(bits.Reverse8(uint8(f.b & 0x1F << 3)))
|
||||
f.b >>= 5
|
||||
f.nb -= 5
|
||||
} else {
|
||||
if dist, err = f.huffSym(f.hd); err != nil {
|
||||
if debugDecode {
|
||||
fmt.Println("huffsym:", err)
|
||||
}
|
||||
f.err = err
|
||||
return
|
||||
}
|
||||
}
|
||||
|
||||
switch {
|
||||
case dist < 4:
|
||||
dist++
|
||||
case dist < maxNumDist:
|
||||
nb := uint(dist-2) >> 1
|
||||
// have 1 bit in bottom of dist, need nb more.
|
||||
extra := (dist & 1) << nb
|
||||
for f.nb < nb {
|
||||
if err = moreBits(); err != nil {
|
||||
if debugDecode {
|
||||
fmt.Println("morebits f.nb<nb:", err)
|
||||
}
|
||||
f.err = err
|
||||
return
|
||||
}
|
||||
}
|
||||
extra |= int(f.b & uint32(1<<nb-1))
|
||||
f.b >>= nb
|
||||
f.nb -= nb
|
||||
dist = 1<<(nb+1) + 1 + extra
|
||||
default:
|
||||
if debugDecode {
|
||||
fmt.Println("dist too big:", dist, maxNumDist)
|
||||
}
|
||||
f.err = CorruptInputError(f.roffset)
|
||||
return
|
||||
}
|
||||
|
||||
// No check on length; encoding can be prescient.
|
||||
if dist > f.dict.histSize() {
|
||||
if debugDecode {
|
||||
fmt.Println("dist > f.dict.histSize():", dist, f.dict.histSize())
|
||||
}
|
||||
f.err = CorruptInputError(f.roffset)
|
||||
return
|
||||
}
|
||||
|
||||
f.copyLen, f.copyDist = length, dist
|
||||
goto copyHistory
|
||||
}
|
||||
|
||||
copyHistory:
|
||||
// Perform a backwards copy according to RFC section 3.2.3.
|
||||
{
|
||||
cnt := f.dict.tryWriteCopy(f.copyDist, f.copyLen)
|
||||
if cnt == 0 {
|
||||
cnt = f.dict.writeCopy(f.copyDist, f.copyLen)
|
||||
}
|
||||
f.copyLen -= cnt
|
||||
|
||||
if f.dict.availWrite() == 0 || f.copyLen > 0 {
|
||||
f.toRead = f.dict.readFlush()
|
||||
f.step = (*decompressor).huffmanBytesReader // We need to continue this work
|
||||
f.stepState = stateDict
|
||||
return
|
||||
}
|
||||
goto readLiteral
|
||||
}
|
||||
}
|
||||
|
||||
// Decode a single Huffman block from f.
|
||||
// hl and hd are the Huffman states for the lit/length values
|
||||
// and the distance values, respectively. If hd == nil, using the
|
||||
// fixed distance encoding associated with fixed Huffman blocks.
|
||||
func (f *decompressor) huffmanBufioReader() {
|
||||
const (
|
||||
stateInit = iota // Zero value must be stateInit
|
||||
stateDict
|
||||
)
|
||||
fr := f.r.(*bufio.Reader)
|
||||
moreBits := func() error {
|
||||
c, err := fr.ReadByte()
|
||||
if err != nil {
|
||||
return noEOF(err)
|
||||
}
|
||||
f.roffset++
|
||||
f.b |= uint32(c) << f.nb
|
||||
f.nb += 8
|
||||
return nil
|
||||
}
|
||||
|
||||
switch f.stepState {
|
||||
case stateInit:
|
||||
goto readLiteral
|
||||
case stateDict:
|
||||
goto copyHistory
|
||||
}
|
||||
|
||||
readLiteral:
|
||||
// Read literal and/or (length, distance) according to RFC section 3.2.3.
|
||||
{
|
||||
var v int
|
||||
{
|
||||
// Inlined v, err := f.huffSym(f.hl)
|
||||
// Since a huffmanDecoder can be empty or be composed of a degenerate tree
|
||||
// with single element, huffSym must error on these two edge cases. In both
|
||||
// cases, the chunks slice will be 0 for the invalid sequence, leading it
|
||||
// satisfy the n == 0 check below.
|
||||
n := uint(f.hl.maxRead)
|
||||
// Optimization. Compiler isn't smart enough to keep f.b,f.nb in registers,
|
||||
// but is smart enough to keep local variables in registers, so use nb and b,
|
||||
// inline call to moreBits and reassign b,nb back to f on return.
|
||||
nb, b := f.nb, f.b
|
||||
for {
|
||||
for nb < n {
|
||||
c, err := fr.ReadByte()
|
||||
if err != nil {
|
||||
f.b = b
|
||||
f.nb = nb
|
||||
f.err = noEOF(err)
|
||||
return
|
||||
}
|
||||
f.roffset++
|
||||
b |= uint32(c) << (nb & 31)
|
||||
nb += 8
|
||||
}
|
||||
chunk := f.hl.chunks[b&(huffmanNumChunks-1)]
|
||||
n = uint(chunk & huffmanCountMask)
|
||||
if n > huffmanChunkBits {
|
||||
chunk = f.hl.links[chunk>>huffmanValueShift][(b>>huffmanChunkBits)&f.hl.linkMask]
|
||||
n = uint(chunk & huffmanCountMask)
|
||||
}
|
||||
if n <= nb {
|
||||
if n == 0 {
|
||||
f.b = b
|
||||
f.nb = nb
|
||||
if debugDecode {
|
||||
fmt.Println("huffsym: n==0")
|
||||
}
|
||||
f.err = CorruptInputError(f.roffset)
|
||||
return
|
||||
}
|
||||
f.b = b >> (n & 31)
|
||||
f.nb = nb - n
|
||||
v = int(chunk >> huffmanValueShift)
|
||||
break
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
var n uint // number of bits extra
|
||||
var length int
|
||||
var err error
|
||||
switch {
|
||||
case v < 256:
|
||||
f.dict.writeByte(byte(v))
|
||||
if f.dict.availWrite() == 0 {
|
||||
f.toRead = f.dict.readFlush()
|
||||
f.step = (*decompressor).huffmanBufioReader
|
||||
f.stepState = stateInit
|
||||
return
|
||||
}
|
||||
goto readLiteral
|
||||
case v == 256:
|
||||
f.finishBlock()
|
||||
return
|
||||
// otherwise, reference to older data
|
||||
case v < 265:
|
||||
length = v - (257 - 3)
|
||||
n = 0
|
||||
case v < 269:
|
||||
length = v*2 - (265*2 - 11)
|
||||
n = 1
|
||||
case v < 273:
|
||||
length = v*4 - (269*4 - 19)
|
||||
n = 2
|
||||
case v < 277:
|
||||
length = v*8 - (273*8 - 35)
|
||||
n = 3
|
||||
case v < 281:
|
||||
length = v*16 - (277*16 - 67)
|
||||
n = 4
|
||||
case v < 285:
|
||||
length = v*32 - (281*32 - 131)
|
||||
n = 5
|
||||
case v < maxNumLit:
|
||||
length = 258
|
||||
n = 0
|
||||
default:
|
||||
if debugDecode {
|
||||
fmt.Println(v, ">= maxNumLit")
|
||||
}
|
||||
f.err = CorruptInputError(f.roffset)
|
||||
return
|
||||
}
|
||||
if n > 0 {
|
||||
for f.nb < n {
|
||||
if err = moreBits(); err != nil {
|
||||
if debugDecode {
|
||||
fmt.Println("morebits n>0:", err)
|
||||
}
|
||||
f.err = err
|
||||
return
|
||||
}
|
||||
}
|
||||
length += int(f.b & uint32(1<<n-1))
|
||||
f.b >>= n
|
||||
f.nb -= n
|
||||
}
|
||||
|
||||
var dist int
|
||||
if f.hd == nil {
|
||||
for f.nb < 5 {
|
||||
if err = moreBits(); err != nil {
|
||||
if debugDecode {
|
||||
fmt.Println("morebits f.nb<5:", err)
|
||||
}
|
||||
f.err = err
|
||||
return
|
||||
}
|
||||
}
|
||||
dist = int(bits.Reverse8(uint8(f.b & 0x1F << 3)))
|
||||
f.b >>= 5
|
||||
f.nb -= 5
|
||||
} else {
|
||||
if dist, err = f.huffSym(f.hd); err != nil {
|
||||
if debugDecode {
|
||||
fmt.Println("huffsym:", err)
|
||||
}
|
||||
f.err = err
|
||||
return
|
||||
}
|
||||
}
|
||||
|
||||
switch {
|
||||
case dist < 4:
|
||||
dist++
|
||||
case dist < maxNumDist:
|
||||
nb := uint(dist-2) >> 1
|
||||
// have 1 bit in bottom of dist, need nb more.
|
||||
extra := (dist & 1) << nb
|
||||
for f.nb < nb {
|
||||
if err = moreBits(); err != nil {
|
||||
if debugDecode {
|
||||
fmt.Println("morebits f.nb<nb:", err)
|
||||
}
|
||||
f.err = err
|
||||
return
|
||||
}
|
||||
}
|
||||
extra |= int(f.b & uint32(1<<nb-1))
|
||||
f.b >>= nb
|
||||
f.nb -= nb
|
||||
dist = 1<<(nb+1) + 1 + extra
|
||||
default:
|
||||
if debugDecode {
|
||||
fmt.Println("dist too big:", dist, maxNumDist)
|
||||
}
|
||||
f.err = CorruptInputError(f.roffset)
|
||||
return
|
||||
}
|
||||
|
||||
// No check on length; encoding can be prescient.
|
||||
if dist > f.dict.histSize() {
|
||||
if debugDecode {
|
||||
fmt.Println("dist > f.dict.histSize():", dist, f.dict.histSize())
|
||||
}
|
||||
f.err = CorruptInputError(f.roffset)
|
||||
return
|
||||
}
|
||||
|
||||
f.copyLen, f.copyDist = length, dist
|
||||
goto copyHistory
|
||||
}
|
||||
|
||||
copyHistory:
|
||||
// Perform a backwards copy according to RFC section 3.2.3.
|
||||
{
|
||||
cnt := f.dict.tryWriteCopy(f.copyDist, f.copyLen)
|
||||
if cnt == 0 {
|
||||
cnt = f.dict.writeCopy(f.copyDist, f.copyLen)
|
||||
}
|
||||
f.copyLen -= cnt
|
||||
|
||||
if f.dict.availWrite() == 0 || f.copyLen > 0 {
|
||||
f.toRead = f.dict.readFlush()
|
||||
f.step = (*decompressor).huffmanBufioReader // We need to continue this work
|
||||
f.stepState = stateDict
|
||||
return
|
||||
}
|
||||
goto readLiteral
|
||||
}
|
||||
}
|
||||
|
||||
// Decode a single Huffman block from f.
|
||||
// hl and hd are the Huffman states for the lit/length values
|
||||
// and the distance values, respectively. If hd == nil, using the
|
||||
// fixed distance encoding associated with fixed Huffman blocks.
|
||||
func (f *decompressor) huffmanStringsReader() {
|
||||
const (
|
||||
stateInit = iota // Zero value must be stateInit
|
||||
stateDict
|
||||
)
|
||||
fr := f.r.(*strings.Reader)
|
||||
moreBits := func() error {
|
||||
c, err := fr.ReadByte()
|
||||
if err != nil {
|
||||
return noEOF(err)
|
||||
}
|
||||
f.roffset++
|
||||
f.b |= uint32(c) << f.nb
|
||||
f.nb += 8
|
||||
return nil
|
||||
}
|
||||
|
||||
switch f.stepState {
|
||||
case stateInit:
|
||||
goto readLiteral
|
||||
case stateDict:
|
||||
goto copyHistory
|
||||
}
|
||||
|
||||
readLiteral:
|
||||
// Read literal and/or (length, distance) according to RFC section 3.2.3.
|
||||
{
|
||||
var v int
|
||||
{
|
||||
// Inlined v, err := f.huffSym(f.hl)
|
||||
// Since a huffmanDecoder can be empty or be composed of a degenerate tree
|
||||
// with single element, huffSym must error on these two edge cases. In both
|
||||
// cases, the chunks slice will be 0 for the invalid sequence, leading it
|
||||
// satisfy the n == 0 check below.
|
||||
n := uint(f.hl.maxRead)
|
||||
// Optimization. Compiler isn't smart enough to keep f.b,f.nb in registers,
|
||||
// but is smart enough to keep local variables in registers, so use nb and b,
|
||||
// inline call to moreBits and reassign b,nb back to f on return.
|
||||
nb, b := f.nb, f.b
|
||||
for {
|
||||
for nb < n {
|
||||
c, err := fr.ReadByte()
|
||||
if err != nil {
|
||||
f.b = b
|
||||
f.nb = nb
|
||||
f.err = noEOF(err)
|
||||
return
|
||||
}
|
||||
f.roffset++
|
||||
b |= uint32(c) << (nb & 31)
|
||||
nb += 8
|
||||
}
|
||||
chunk := f.hl.chunks[b&(huffmanNumChunks-1)]
|
||||
n = uint(chunk & huffmanCountMask)
|
||||
if n > huffmanChunkBits {
|
||||
chunk = f.hl.links[chunk>>huffmanValueShift][(b>>huffmanChunkBits)&f.hl.linkMask]
|
||||
n = uint(chunk & huffmanCountMask)
|
||||
}
|
||||
if n <= nb {
|
||||
if n == 0 {
|
||||
f.b = b
|
||||
f.nb = nb
|
||||
if debugDecode {
|
||||
fmt.Println("huffsym: n==0")
|
||||
}
|
||||
f.err = CorruptInputError(f.roffset)
|
||||
return
|
||||
}
|
||||
f.b = b >> (n & 31)
|
||||
f.nb = nb - n
|
||||
v = int(chunk >> huffmanValueShift)
|
||||
break
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
var n uint // number of bits extra
|
||||
var length int
|
||||
var err error
|
||||
switch {
|
||||
case v < 256:
|
||||
f.dict.writeByte(byte(v))
|
||||
if f.dict.availWrite() == 0 {
|
||||
f.toRead = f.dict.readFlush()
|
||||
f.step = (*decompressor).huffmanStringsReader
|
||||
f.stepState = stateInit
|
||||
return
|
||||
}
|
||||
goto readLiteral
|
||||
case v == 256:
|
||||
f.finishBlock()
|
||||
return
|
||||
// otherwise, reference to older data
|
||||
case v < 265:
|
||||
length = v - (257 - 3)
|
||||
n = 0
|
||||
case v < 269:
|
||||
length = v*2 - (265*2 - 11)
|
||||
n = 1
|
||||
case v < 273:
|
||||
length = v*4 - (269*4 - 19)
|
||||
n = 2
|
||||
case v < 277:
|
||||
length = v*8 - (273*8 - 35)
|
||||
n = 3
|
||||
case v < 281:
|
||||
length = v*16 - (277*16 - 67)
|
||||
n = 4
|
||||
case v < 285:
|
||||
length = v*32 - (281*32 - 131)
|
||||
n = 5
|
||||
case v < maxNumLit:
|
||||
length = 258
|
||||
n = 0
|
||||
default:
|
||||
if debugDecode {
|
||||
fmt.Println(v, ">= maxNumLit")
|
||||
}
|
||||
f.err = CorruptInputError(f.roffset)
|
||||
return
|
||||
}
|
||||
if n > 0 {
|
||||
for f.nb < n {
|
||||
if err = moreBits(); err != nil {
|
||||
if debugDecode {
|
||||
fmt.Println("morebits n>0:", err)
|
||||
}
|
||||
f.err = err
|
||||
return
|
||||
}
|
||||
}
|
||||
length += int(f.b & uint32(1<<n-1))
|
||||
f.b >>= n
|
||||
f.nb -= n
|
||||
}
|
||||
|
||||
var dist int
|
||||
if f.hd == nil {
|
||||
for f.nb < 5 {
|
||||
if err = moreBits(); err != nil {
|
||||
if debugDecode {
|
||||
fmt.Println("morebits f.nb<5:", err)
|
||||
}
|
||||
f.err = err
|
||||
return
|
||||
}
|
||||
}
|
||||
dist = int(bits.Reverse8(uint8(f.b & 0x1F << 3)))
|
||||
f.b >>= 5
|
||||
f.nb -= 5
|
||||
} else {
|
||||
if dist, err = f.huffSym(f.hd); err != nil {
|
||||
if debugDecode {
|
||||
fmt.Println("huffsym:", err)
|
||||
}
|
||||
f.err = err
|
||||
return
|
||||
}
|
||||
}
|
||||
|
||||
switch {
|
||||
case dist < 4:
|
||||
dist++
|
||||
case dist < maxNumDist:
|
||||
nb := uint(dist-2) >> 1
|
||||
// have 1 bit in bottom of dist, need nb more.
|
||||
extra := (dist & 1) << nb
|
||||
for f.nb < nb {
|
||||
if err = moreBits(); err != nil {
|
||||
if debugDecode {
|
||||
fmt.Println("morebits f.nb<nb:", err)
|
||||
}
|
||||
f.err = err
|
||||
return
|
||||
}
|
||||
}
|
||||
extra |= int(f.b & uint32(1<<nb-1))
|
||||
f.b >>= nb
|
||||
f.nb -= nb
|
||||
dist = 1<<(nb+1) + 1 + extra
|
||||
default:
|
||||
if debugDecode {
|
||||
fmt.Println("dist too big:", dist, maxNumDist)
|
||||
}
|
||||
f.err = CorruptInputError(f.roffset)
|
||||
return
|
||||
}
|
||||
|
||||
// No check on length; encoding can be prescient.
|
||||
if dist > f.dict.histSize() {
|
||||
if debugDecode {
|
||||
fmt.Println("dist > f.dict.histSize():", dist, f.dict.histSize())
|
||||
}
|
||||
f.err = CorruptInputError(f.roffset)
|
||||
return
|
||||
}
|
||||
|
||||
f.copyLen, f.copyDist = length, dist
|
||||
goto copyHistory
|
||||
}
|
||||
|
||||
copyHistory:
|
||||
// Perform a backwards copy according to RFC section 3.2.3.
|
||||
{
|
||||
cnt := f.dict.tryWriteCopy(f.copyDist, f.copyLen)
|
||||
if cnt == 0 {
|
||||
cnt = f.dict.writeCopy(f.copyDist, f.copyLen)
|
||||
}
|
||||
f.copyLen -= cnt
|
||||
|
||||
if f.dict.availWrite() == 0 || f.copyLen > 0 {
|
||||
f.toRead = f.dict.readFlush()
|
||||
f.step = (*decompressor).huffmanStringsReader // We need to continue this work
|
||||
f.stepState = stateDict
|
||||
return
|
||||
}
|
||||
goto readLiteral
|
||||
}
|
||||
}
|
||||
|
||||
func (f *decompressor) huffmanBlockDecoder() func() {
|
||||
switch f.r.(type) {
|
||||
case *bytes.Buffer:
|
||||
return f.huffmanBytesBuffer
|
||||
case *bytes.Reader:
|
||||
return f.huffmanBytesReader
|
||||
case *bufio.Reader:
|
||||
return f.huffmanBufioReader
|
||||
case *strings.Reader:
|
||||
return f.huffmanStringsReader
|
||||
default:
|
||||
return f.huffmanBlockGeneric
|
||||
}
|
||||
}
|
||||
|
|
@ -1,5 +1,7 @@
|
|||
package flate
|
||||
|
||||
import "fmt"
|
||||
|
||||
// fastGen maintains the table for matches,
|
||||
// and the previous byte block for level 2.
|
||||
// This is the generic implementation.
|
||||
|
|
@ -14,6 +16,9 @@ func (e *fastEncL1) Encode(dst *tokens, src []byte) {
|
|||
inputMargin = 12 - 1
|
||||
minNonLiteralBlockSize = 1 + 1 + inputMargin
|
||||
)
|
||||
if debugDeflate && e.cur < 0 {
|
||||
panic(fmt.Sprint("e.cur < 0: ", e.cur))
|
||||
}
|
||||
|
||||
// Protect against e.cur wraparound.
|
||||
for e.cur >= bufferReset {
|
||||
|
|
@ -76,12 +81,12 @@ func (e *fastEncL1) Encode(dst *tokens, src []byte) {
|
|||
}
|
||||
|
||||
now := load6432(src, nextS)
|
||||
e.table[nextHash] = tableEntry{offset: s + e.cur, val: cv}
|
||||
e.table[nextHash] = tableEntry{offset: s + e.cur}
|
||||
nextHash = hash(uint32(now))
|
||||
|
||||
offset := s - (candidate.offset - e.cur)
|
||||
if offset < maxMatchOffset && cv == candidate.val {
|
||||
e.table[nextHash] = tableEntry{offset: nextS + e.cur, val: uint32(now)}
|
||||
if offset < maxMatchOffset && cv == load3232(src, candidate.offset-e.cur) {
|
||||
e.table[nextHash] = tableEntry{offset: nextS + e.cur}
|
||||
break
|
||||
}
|
||||
|
||||
|
|
@ -91,11 +96,11 @@ func (e *fastEncL1) Encode(dst *tokens, src []byte) {
|
|||
nextS++
|
||||
candidate = e.table[nextHash]
|
||||
now >>= 8
|
||||
e.table[nextHash] = tableEntry{offset: s + e.cur, val: cv}
|
||||
e.table[nextHash] = tableEntry{offset: s + e.cur}
|
||||
|
||||
offset = s - (candidate.offset - e.cur)
|
||||
if offset < maxMatchOffset && cv == candidate.val {
|
||||
e.table[nextHash] = tableEntry{offset: nextS + e.cur, val: uint32(now)}
|
||||
if offset < maxMatchOffset && cv == load3232(src, candidate.offset-e.cur) {
|
||||
e.table[nextHash] = tableEntry{offset: nextS + e.cur}
|
||||
break
|
||||
}
|
||||
cv = uint32(now)
|
||||
|
|
@ -134,7 +139,7 @@ func (e *fastEncL1) Encode(dst *tokens, src []byte) {
|
|||
// Index first pair after match end.
|
||||
if int(s+l+4) < len(src) {
|
||||
cv := load3232(src, s)
|
||||
e.table[hash(cv)] = tableEntry{offset: s + e.cur, val: cv}
|
||||
e.table[hash(cv)] = tableEntry{offset: s + e.cur}
|
||||
}
|
||||
goto emitRemainder
|
||||
}
|
||||
|
|
@ -148,14 +153,14 @@ func (e *fastEncL1) Encode(dst *tokens, src []byte) {
|
|||
x := load6432(src, s-2)
|
||||
o := e.cur + s - 2
|
||||
prevHash := hash(uint32(x))
|
||||
e.table[prevHash] = tableEntry{offset: o, val: uint32(x)}
|
||||
e.table[prevHash] = tableEntry{offset: o}
|
||||
x >>= 16
|
||||
currHash := hash(uint32(x))
|
||||
candidate = e.table[currHash]
|
||||
e.table[currHash] = tableEntry{offset: o + 2, val: uint32(x)}
|
||||
e.table[currHash] = tableEntry{offset: o + 2}
|
||||
|
||||
offset := s - (candidate.offset - e.cur)
|
||||
if offset > maxMatchOffset || uint32(x) != candidate.val {
|
||||
if offset > maxMatchOffset || uint32(x) != load3232(src, candidate.offset-e.cur) {
|
||||
cv = uint32(x >> 8)
|
||||
s++
|
||||
break
|
||||
|
|
|
|||
|
|
@ -1,5 +1,7 @@
|
|||
package flate
|
||||
|
||||
import "fmt"
|
||||
|
||||
// fastGen maintains the table for matches,
|
||||
// and the previous byte block for level 2.
|
||||
// This is the generic implementation.
|
||||
|
|
@ -16,6 +18,10 @@ func (e *fastEncL2) Encode(dst *tokens, src []byte) {
|
|||
minNonLiteralBlockSize = 1 + 1 + inputMargin
|
||||
)
|
||||
|
||||
if debugDeflate && e.cur < 0 {
|
||||
panic(fmt.Sprint("e.cur < 0: ", e.cur))
|
||||
}
|
||||
|
||||
// Protect against e.cur wraparound.
|
||||
for e.cur >= bufferReset {
|
||||
if len(e.hist) == 0 {
|
||||
|
|
@ -77,12 +83,12 @@ func (e *fastEncL2) Encode(dst *tokens, src []byte) {
|
|||
}
|
||||
candidate = e.table[nextHash]
|
||||
now := load6432(src, nextS)
|
||||
e.table[nextHash] = tableEntry{offset: s + e.cur, val: cv}
|
||||
e.table[nextHash] = tableEntry{offset: s + e.cur}
|
||||
nextHash = hash4u(uint32(now), bTableBits)
|
||||
|
||||
offset := s - (candidate.offset - e.cur)
|
||||
if offset < maxMatchOffset && cv == candidate.val {
|
||||
e.table[nextHash] = tableEntry{offset: nextS + e.cur, val: uint32(now)}
|
||||
if offset < maxMatchOffset && cv == load3232(src, candidate.offset-e.cur) {
|
||||
e.table[nextHash] = tableEntry{offset: nextS + e.cur}
|
||||
break
|
||||
}
|
||||
|
||||
|
|
@ -92,10 +98,10 @@ func (e *fastEncL2) Encode(dst *tokens, src []byte) {
|
|||
nextS++
|
||||
candidate = e.table[nextHash]
|
||||
now >>= 8
|
||||
e.table[nextHash] = tableEntry{offset: s + e.cur, val: cv}
|
||||
e.table[nextHash] = tableEntry{offset: s + e.cur}
|
||||
|
||||
offset = s - (candidate.offset - e.cur)
|
||||
if offset < maxMatchOffset && cv == candidate.val {
|
||||
if offset < maxMatchOffset && cv == load3232(src, candidate.offset-e.cur) {
|
||||
break
|
||||
}
|
||||
cv = uint32(now)
|
||||
|
|
@ -142,7 +148,7 @@ func (e *fastEncL2) Encode(dst *tokens, src []byte) {
|
|||
// Index first pair after match end.
|
||||
if int(s+l+4) < len(src) {
|
||||
cv := load3232(src, s)
|
||||
e.table[hash4u(cv, bTableBits)] = tableEntry{offset: s + e.cur, val: cv}
|
||||
e.table[hash4u(cv, bTableBits)] = tableEntry{offset: s + e.cur}
|
||||
}
|
||||
goto emitRemainder
|
||||
}
|
||||
|
|
@ -151,15 +157,15 @@ func (e *fastEncL2) Encode(dst *tokens, src []byte) {
|
|||
for i := s - l + 2; i < s-5; i += 7 {
|
||||
x := load6432(src, int32(i))
|
||||
nextHash := hash4u(uint32(x), bTableBits)
|
||||
e.table[nextHash] = tableEntry{offset: e.cur + i, val: uint32(x)}
|
||||
e.table[nextHash] = tableEntry{offset: e.cur + i}
|
||||
// Skip one
|
||||
x >>= 16
|
||||
nextHash = hash4u(uint32(x), bTableBits)
|
||||
e.table[nextHash] = tableEntry{offset: e.cur + i + 2, val: uint32(x)}
|
||||
e.table[nextHash] = tableEntry{offset: e.cur + i + 2}
|
||||
// Skip one
|
||||
x >>= 16
|
||||
nextHash = hash4u(uint32(x), bTableBits)
|
||||
e.table[nextHash] = tableEntry{offset: e.cur + i + 4, val: uint32(x)}
|
||||
e.table[nextHash] = tableEntry{offset: e.cur + i + 4}
|
||||
}
|
||||
|
||||
// We could immediately start working at s now, but to improve
|
||||
|
|
@ -172,14 +178,14 @@ func (e *fastEncL2) Encode(dst *tokens, src []byte) {
|
|||
o := e.cur + s - 2
|
||||
prevHash := hash4u(uint32(x), bTableBits)
|
||||
prevHash2 := hash4u(uint32(x>>8), bTableBits)
|
||||
e.table[prevHash] = tableEntry{offset: o, val: uint32(x)}
|
||||
e.table[prevHash2] = tableEntry{offset: o + 1, val: uint32(x >> 8)}
|
||||
e.table[prevHash] = tableEntry{offset: o}
|
||||
e.table[prevHash2] = tableEntry{offset: o + 1}
|
||||
currHash := hash4u(uint32(x>>16), bTableBits)
|
||||
candidate = e.table[currHash]
|
||||
e.table[currHash] = tableEntry{offset: o + 2, val: uint32(x >> 16)}
|
||||
e.table[currHash] = tableEntry{offset: o + 2}
|
||||
|
||||
offset := s - (candidate.offset - e.cur)
|
||||
if offset > maxMatchOffset || uint32(x>>16) != candidate.val {
|
||||
if offset > maxMatchOffset || uint32(x>>16) != load3232(src, candidate.offset-e.cur) {
|
||||
cv = uint32(x >> 24)
|
||||
s++
|
||||
break
|
||||
|
|
|
|||
|
|
@ -1,5 +1,7 @@
|
|||
package flate
|
||||
|
||||
import "fmt"
|
||||
|
||||
// fastEncL3
|
||||
type fastEncL3 struct {
|
||||
fastGen
|
||||
|
|
@ -13,6 +15,10 @@ func (e *fastEncL3) Encode(dst *tokens, src []byte) {
|
|||
minNonLiteralBlockSize = 1 + 1 + inputMargin
|
||||
)
|
||||
|
||||
if debugDeflate && e.cur < 0 {
|
||||
panic(fmt.Sprint("e.cur < 0: ", e.cur))
|
||||
}
|
||||
|
||||
// Protect against e.cur wraparound.
|
||||
for e.cur >= bufferReset {
|
||||
if len(e.hist) == 0 {
|
||||
|
|
@ -75,22 +81,26 @@ func (e *fastEncL3) Encode(dst *tokens, src []byte) {
|
|||
}
|
||||
candidates := e.table[nextHash]
|
||||
now := load3232(src, nextS)
|
||||
e.table[nextHash] = tableEntryPrev{Prev: candidates.Cur, Cur: tableEntry{offset: s + e.cur, val: cv}}
|
||||
|
||||
// Safe offset distance until s + 4...
|
||||
minOffset := e.cur + s - (maxMatchOffset - 4)
|
||||
e.table[nextHash] = tableEntryPrev{Prev: candidates.Cur, Cur: tableEntry{offset: s + e.cur}}
|
||||
|
||||
// Check both candidates
|
||||
candidate = candidates.Cur
|
||||
offset := s - (candidate.offset - e.cur)
|
||||
if cv == candidate.val {
|
||||
if offset > maxMatchOffset {
|
||||
if candidate.offset < minOffset {
|
||||
cv = now
|
||||
// Previous will also be invalid, we have nothing.
|
||||
continue
|
||||
}
|
||||
o2 := s - (candidates.Prev.offset - e.cur)
|
||||
if cv != candidates.Prev.val || o2 > maxMatchOffset {
|
||||
|
||||
if cv == load3232(src, candidate.offset-e.cur) {
|
||||
if candidates.Prev.offset < minOffset || cv != load3232(src, candidates.Prev.offset-e.cur) {
|
||||
break
|
||||
}
|
||||
// Both match and are valid, pick longest.
|
||||
offset := s - (candidate.offset - e.cur)
|
||||
o2 := s - (candidates.Prev.offset - e.cur)
|
||||
l1, l2 := matchLen(src[s+4:], src[s-offset+4:]), matchLen(src[s+4:], src[s-o2+4:])
|
||||
if l2 > l1 {
|
||||
candidate = candidates.Prev
|
||||
|
|
@ -100,13 +110,10 @@ func (e *fastEncL3) Encode(dst *tokens, src []byte) {
|
|||
// We only check if value mismatches.
|
||||
// Offset will always be invalid in other cases.
|
||||
candidate = candidates.Prev
|
||||
if cv == candidate.val {
|
||||
offset := s - (candidate.offset - e.cur)
|
||||
if offset <= maxMatchOffset {
|
||||
if candidate.offset > minOffset && cv == load3232(src, candidate.offset-e.cur) {
|
||||
break
|
||||
}
|
||||
}
|
||||
}
|
||||
cv = now
|
||||
}
|
||||
|
||||
|
|
@ -152,7 +159,7 @@ func (e *fastEncL3) Encode(dst *tokens, src []byte) {
|
|||
nextHash := hash(cv)
|
||||
e.table[nextHash] = tableEntryPrev{
|
||||
Prev: e.table[nextHash].Cur,
|
||||
Cur: tableEntry{offset: e.cur + t, val: cv},
|
||||
Cur: tableEntry{offset: e.cur + t},
|
||||
}
|
||||
}
|
||||
goto emitRemainder
|
||||
|
|
@ -164,21 +171,21 @@ func (e *fastEncL3) Encode(dst *tokens, src []byte) {
|
|||
prevHash := hash(uint32(x))
|
||||
e.table[prevHash] = tableEntryPrev{
|
||||
Prev: e.table[prevHash].Cur,
|
||||
Cur: tableEntry{offset: e.cur + s - 3, val: uint32(x)},
|
||||
Cur: tableEntry{offset: e.cur + s - 3},
|
||||
}
|
||||
x >>= 8
|
||||
prevHash = hash(uint32(x))
|
||||
|
||||
e.table[prevHash] = tableEntryPrev{
|
||||
Prev: e.table[prevHash].Cur,
|
||||
Cur: tableEntry{offset: e.cur + s - 2, val: uint32(x)},
|
||||
Cur: tableEntry{offset: e.cur + s - 2},
|
||||
}
|
||||
x >>= 8
|
||||
prevHash = hash(uint32(x))
|
||||
|
||||
e.table[prevHash] = tableEntryPrev{
|
||||
Prev: e.table[prevHash].Cur,
|
||||
Cur: tableEntry{offset: e.cur + s - 1, val: uint32(x)},
|
||||
Cur: tableEntry{offset: e.cur + s - 1},
|
||||
}
|
||||
x >>= 8
|
||||
currHash := hash(uint32(x))
|
||||
|
|
@ -186,21 +193,18 @@ func (e *fastEncL3) Encode(dst *tokens, src []byte) {
|
|||
cv = uint32(x)
|
||||
e.table[currHash] = tableEntryPrev{
|
||||
Prev: candidates.Cur,
|
||||
Cur: tableEntry{offset: s + e.cur, val: cv},
|
||||
Cur: tableEntry{offset: s + e.cur},
|
||||
}
|
||||
|
||||
// Check both candidates
|
||||
candidate = candidates.Cur
|
||||
if cv == candidate.val {
|
||||
offset := s - (candidate.offset - e.cur)
|
||||
if offset <= maxMatchOffset {
|
||||
continue
|
||||
}
|
||||
} else {
|
||||
minOffset := e.cur + s - (maxMatchOffset - 4)
|
||||
|
||||
if candidate.offset > minOffset && cv != load3232(src, candidate.offset-e.cur) {
|
||||
// We only check if value mismatches.
|
||||
// Offset will always be invalid in other cases.
|
||||
candidate = candidates.Prev
|
||||
if cv == candidate.val {
|
||||
if candidate.offset > minOffset && cv == load3232(src, candidate.offset-e.cur) {
|
||||
offset := s - (candidate.offset - e.cur)
|
||||
if offset <= maxMatchOffset {
|
||||
continue
|
||||
|
|
|
|||
|
|
@ -13,7 +13,9 @@ func (e *fastEncL4) Encode(dst *tokens, src []byte) {
|
|||
inputMargin = 12 - 1
|
||||
minNonLiteralBlockSize = 1 + 1 + inputMargin
|
||||
)
|
||||
|
||||
if debugDeflate && e.cur < 0 {
|
||||
panic(fmt.Sprint("e.cur < 0: ", e.cur))
|
||||
}
|
||||
// Protect against e.cur wraparound.
|
||||
for e.cur >= bufferReset {
|
||||
if len(e.hist) == 0 {
|
||||
|
|
@ -90,24 +92,24 @@ func (e *fastEncL4) Encode(dst *tokens, src []byte) {
|
|||
sCandidate := e.table[nextHashS]
|
||||
lCandidate := e.bTable[nextHashL]
|
||||
next := load6432(src, nextS)
|
||||
entry := tableEntry{offset: s + e.cur, val: uint32(cv)}
|
||||
entry := tableEntry{offset: s + e.cur}
|
||||
e.table[nextHashS] = entry
|
||||
e.bTable[nextHashL] = entry
|
||||
|
||||
t = lCandidate.offset - e.cur
|
||||
if s-t < maxMatchOffset && uint32(cv) == lCandidate.val {
|
||||
if s-t < maxMatchOffset && uint32(cv) == load3232(src, lCandidate.offset-e.cur) {
|
||||
// We got a long match. Use that.
|
||||
break
|
||||
}
|
||||
|
||||
t = sCandidate.offset - e.cur
|
||||
if s-t < maxMatchOffset && uint32(cv) == sCandidate.val {
|
||||
if s-t < maxMatchOffset && uint32(cv) == load3232(src, sCandidate.offset-e.cur) {
|
||||
// Found a 4 match...
|
||||
lCandidate = e.bTable[hash7(next, tableBits)]
|
||||
|
||||
// If the next long is a candidate, check if we should use that instead...
|
||||
lOff := nextS - (lCandidate.offset - e.cur)
|
||||
if lOff < maxMatchOffset && lCandidate.val == uint32(next) {
|
||||
if lOff < maxMatchOffset && load3232(src, lCandidate.offset-e.cur) == uint32(next) {
|
||||
l1, l2 := matchLen(src[s+4:], src[t+4:]), matchLen(src[nextS+4:], src[nextS-lOff+4:])
|
||||
if l2 > l1 {
|
||||
s = nextS
|
||||
|
|
@ -135,7 +137,7 @@ func (e *fastEncL4) Encode(dst *tokens, src []byte) {
|
|||
if nextEmit < s {
|
||||
emitLiteral(dst, src[nextEmit:s])
|
||||
}
|
||||
if false {
|
||||
if debugDeflate {
|
||||
if t >= s {
|
||||
panic("s-t")
|
||||
}
|
||||
|
|
@ -158,8 +160,8 @@ func (e *fastEncL4) Encode(dst *tokens, src []byte) {
|
|||
// Index first pair after match end.
|
||||
if int(s+8) < len(src) {
|
||||
cv := load6432(src, s)
|
||||
e.table[hash4x64(cv, tableBits)] = tableEntry{offset: s + e.cur, val: uint32(cv)}
|
||||
e.bTable[hash7(cv, tableBits)] = tableEntry{offset: s + e.cur, val: uint32(cv)}
|
||||
e.table[hash4x64(cv, tableBits)] = tableEntry{offset: s + e.cur}
|
||||
e.bTable[hash7(cv, tableBits)] = tableEntry{offset: s + e.cur}
|
||||
}
|
||||
goto emitRemainder
|
||||
}
|
||||
|
|
@ -169,20 +171,20 @@ func (e *fastEncL4) Encode(dst *tokens, src []byte) {
|
|||
i := nextS
|
||||
if i < s-1 {
|
||||
cv := load6432(src, i)
|
||||
t := tableEntry{offset: i + e.cur, val: uint32(cv)}
|
||||
t2 := tableEntry{val: uint32(cv >> 8), offset: t.offset + 1}
|
||||
t := tableEntry{offset: i + e.cur}
|
||||
t2 := tableEntry{offset: t.offset + 1}
|
||||
e.bTable[hash7(cv, tableBits)] = t
|
||||
e.bTable[hash7(cv>>8, tableBits)] = t2
|
||||
e.table[hash4u(t2.val, tableBits)] = t2
|
||||
e.table[hash4u(uint32(cv>>8), tableBits)] = t2
|
||||
|
||||
i += 3
|
||||
for ; i < s-1; i += 3 {
|
||||
cv := load6432(src, i)
|
||||
t := tableEntry{offset: i + e.cur, val: uint32(cv)}
|
||||
t2 := tableEntry{val: uint32(cv >> 8), offset: t.offset + 1}
|
||||
t := tableEntry{offset: i + e.cur}
|
||||
t2 := tableEntry{offset: t.offset + 1}
|
||||
e.bTable[hash7(cv, tableBits)] = t
|
||||
e.bTable[hash7(cv>>8, tableBits)] = t2
|
||||
e.table[hash4u(t2.val, tableBits)] = t2
|
||||
e.table[hash4u(uint32(cv>>8), tableBits)] = t2
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
@ -193,8 +195,8 @@ func (e *fastEncL4) Encode(dst *tokens, src []byte) {
|
|||
o := e.cur + s - 1
|
||||
prevHashS := hash4x64(x, tableBits)
|
||||
prevHashL := hash7(x, tableBits)
|
||||
e.table[prevHashS] = tableEntry{offset: o, val: uint32(x)}
|
||||
e.bTable[prevHashL] = tableEntry{offset: o, val: uint32(x)}
|
||||
e.table[prevHashS] = tableEntry{offset: o}
|
||||
e.bTable[prevHashL] = tableEntry{offset: o}
|
||||
cv = x >> 8
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -13,6 +13,9 @@ func (e *fastEncL5) Encode(dst *tokens, src []byte) {
|
|||
inputMargin = 12 - 1
|
||||
minNonLiteralBlockSize = 1 + 1 + inputMargin
|
||||
)
|
||||
if debugDeflate && e.cur < 0 {
|
||||
panic(fmt.Sprint("e.cur < 0: ", e.cur))
|
||||
}
|
||||
|
||||
// Protect against e.cur wraparound.
|
||||
for e.cur >= bufferReset {
|
||||
|
|
@ -97,7 +100,7 @@ func (e *fastEncL5) Encode(dst *tokens, src []byte) {
|
|||
sCandidate := e.table[nextHashS]
|
||||
lCandidate := e.bTable[nextHashL]
|
||||
next := load6432(src, nextS)
|
||||
entry := tableEntry{offset: s + e.cur, val: uint32(cv)}
|
||||
entry := tableEntry{offset: s + e.cur}
|
||||
e.table[nextHashS] = entry
|
||||
eLong := &e.bTable[nextHashL]
|
||||
eLong.Cur, eLong.Prev = entry, eLong.Cur
|
||||
|
|
@ -107,14 +110,14 @@ func (e *fastEncL5) Encode(dst *tokens, src []byte) {
|
|||
|
||||
t = lCandidate.Cur.offset - e.cur
|
||||
if s-t < maxMatchOffset {
|
||||
if uint32(cv) == lCandidate.Cur.val {
|
||||
if uint32(cv) == load3232(src, lCandidate.Cur.offset-e.cur) {
|
||||
// Store the next match
|
||||
e.table[nextHashS] = tableEntry{offset: nextS + e.cur, val: uint32(next)}
|
||||
e.table[nextHashS] = tableEntry{offset: nextS + e.cur}
|
||||
eLong := &e.bTable[nextHashL]
|
||||
eLong.Cur, eLong.Prev = tableEntry{offset: nextS + e.cur, val: uint32(next)}, eLong.Cur
|
||||
eLong.Cur, eLong.Prev = tableEntry{offset: nextS + e.cur}, eLong.Cur
|
||||
|
||||
t2 := lCandidate.Prev.offset - e.cur
|
||||
if s-t2 < maxMatchOffset && uint32(cv) == lCandidate.Prev.val {
|
||||
if s-t2 < maxMatchOffset && uint32(cv) == load3232(src, lCandidate.Prev.offset-e.cur) {
|
||||
l = e.matchlen(s+4, t+4, src) + 4
|
||||
ml1 := e.matchlen(s+4, t2+4, src) + 4
|
||||
if ml1 > l {
|
||||
|
|
@ -126,30 +129,30 @@ func (e *fastEncL5) Encode(dst *tokens, src []byte) {
|
|||
break
|
||||
}
|
||||
t = lCandidate.Prev.offset - e.cur
|
||||
if s-t < maxMatchOffset && uint32(cv) == lCandidate.Prev.val {
|
||||
if s-t < maxMatchOffset && uint32(cv) == load3232(src, lCandidate.Prev.offset-e.cur) {
|
||||
// Store the next match
|
||||
e.table[nextHashS] = tableEntry{offset: nextS + e.cur, val: uint32(next)}
|
||||
e.table[nextHashS] = tableEntry{offset: nextS + e.cur}
|
||||
eLong := &e.bTable[nextHashL]
|
||||
eLong.Cur, eLong.Prev = tableEntry{offset: nextS + e.cur, val: uint32(next)}, eLong.Cur
|
||||
eLong.Cur, eLong.Prev = tableEntry{offset: nextS + e.cur}, eLong.Cur
|
||||
break
|
||||
}
|
||||
}
|
||||
|
||||
t = sCandidate.offset - e.cur
|
||||
if s-t < maxMatchOffset && uint32(cv) == sCandidate.val {
|
||||
if s-t < maxMatchOffset && uint32(cv) == load3232(src, sCandidate.offset-e.cur) {
|
||||
// Found a 4 match...
|
||||
l = e.matchlen(s+4, t+4, src) + 4
|
||||
lCandidate = e.bTable[nextHashL]
|
||||
// Store the next match
|
||||
|
||||
e.table[nextHashS] = tableEntry{offset: nextS + e.cur, val: uint32(next)}
|
||||
e.table[nextHashS] = tableEntry{offset: nextS + e.cur}
|
||||
eLong := &e.bTable[nextHashL]
|
||||
eLong.Cur, eLong.Prev = tableEntry{offset: nextS + e.cur, val: uint32(next)}, eLong.Cur
|
||||
eLong.Cur, eLong.Prev = tableEntry{offset: nextS + e.cur}, eLong.Cur
|
||||
|
||||
// If the next long is a candidate, use that...
|
||||
t2 := lCandidate.Cur.offset - e.cur
|
||||
if nextS-t2 < maxMatchOffset {
|
||||
if lCandidate.Cur.val == uint32(next) {
|
||||
if load3232(src, lCandidate.Cur.offset-e.cur) == uint32(next) {
|
||||
ml := e.matchlen(nextS+4, t2+4, src) + 4
|
||||
if ml > l {
|
||||
t = t2
|
||||
|
|
@ -160,7 +163,7 @@ func (e *fastEncL5) Encode(dst *tokens, src []byte) {
|
|||
}
|
||||
// If the previous long is a candidate, use that...
|
||||
t2 = lCandidate.Prev.offset - e.cur
|
||||
if nextS-t2 < maxMatchOffset && lCandidate.Prev.val == uint32(next) {
|
||||
if nextS-t2 < maxMatchOffset && load3232(src, lCandidate.Prev.offset-e.cur) == uint32(next) {
|
||||
ml := e.matchlen(nextS+4, t2+4, src) + 4
|
||||
if ml > l {
|
||||
t = t2
|
||||
|
|
@ -194,7 +197,7 @@ func (e *fastEncL5) Encode(dst *tokens, src []byte) {
|
|||
if nextEmit < s {
|
||||
emitLiteral(dst, src[nextEmit:s])
|
||||
}
|
||||
if false {
|
||||
if debugDeflate {
|
||||
if t >= s {
|
||||
panic(fmt.Sprintln("s-t", s, t))
|
||||
}
|
||||
|
|
@ -223,31 +226,31 @@ func (e *fastEncL5) Encode(dst *tokens, src []byte) {
|
|||
i := s - l + 1
|
||||
if i < s-1 {
|
||||
cv := load6432(src, i)
|
||||
t := tableEntry{offset: i + e.cur, val: uint32(cv)}
|
||||
t := tableEntry{offset: i + e.cur}
|
||||
e.table[hash4x64(cv, tableBits)] = t
|
||||
eLong := &e.bTable[hash7(cv, tableBits)]
|
||||
eLong.Cur, eLong.Prev = t, eLong.Cur
|
||||
|
||||
// Do an long at i+1
|
||||
cv >>= 8
|
||||
t = tableEntry{offset: t.offset + 1, val: uint32(cv)}
|
||||
t = tableEntry{offset: t.offset + 1}
|
||||
eLong = &e.bTable[hash7(cv, tableBits)]
|
||||
eLong.Cur, eLong.Prev = t, eLong.Cur
|
||||
|
||||
// We only have enough bits for a short entry at i+2
|
||||
cv >>= 8
|
||||
t = tableEntry{offset: t.offset + 1, val: uint32(cv)}
|
||||
t = tableEntry{offset: t.offset + 1}
|
||||
e.table[hash4x64(cv, tableBits)] = t
|
||||
|
||||
// Skip one - otherwise we risk hitting 's'
|
||||
i += 4
|
||||
for ; i < s-1; i += hashEvery {
|
||||
cv := load6432(src, i)
|
||||
t := tableEntry{offset: i + e.cur, val: uint32(cv)}
|
||||
t2 := tableEntry{offset: t.offset + 1, val: uint32(cv >> 8)}
|
||||
t := tableEntry{offset: i + e.cur}
|
||||
t2 := tableEntry{offset: t.offset + 1}
|
||||
eLong := &e.bTable[hash7(cv, tableBits)]
|
||||
eLong.Cur, eLong.Prev = t, eLong.Cur
|
||||
e.table[hash4u(t2.val, tableBits)] = t2
|
||||
e.table[hash4u(uint32(cv>>8), tableBits)] = t2
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
@ -258,9 +261,9 @@ func (e *fastEncL5) Encode(dst *tokens, src []byte) {
|
|||
o := e.cur + s - 1
|
||||
prevHashS := hash4x64(x, tableBits)
|
||||
prevHashL := hash7(x, tableBits)
|
||||
e.table[prevHashS] = tableEntry{offset: o, val: uint32(x)}
|
||||
e.table[prevHashS] = tableEntry{offset: o}
|
||||
eLong := &e.bTable[prevHashL]
|
||||
eLong.Cur, eLong.Prev = tableEntry{offset: o, val: uint32(x)}, eLong.Cur
|
||||
eLong.Cur, eLong.Prev = tableEntry{offset: o}, eLong.Cur
|
||||
cv = x >> 8
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -13,6 +13,9 @@ func (e *fastEncL6) Encode(dst *tokens, src []byte) {
|
|||
inputMargin = 12 - 1
|
||||
minNonLiteralBlockSize = 1 + 1 + inputMargin
|
||||
)
|
||||
if debugDeflate && e.cur < 0 {
|
||||
panic(fmt.Sprint("e.cur < 0: ", e.cur))
|
||||
}
|
||||
|
||||
// Protect against e.cur wraparound.
|
||||
for e.cur >= bufferReset {
|
||||
|
|
@ -98,7 +101,7 @@ func (e *fastEncL6) Encode(dst *tokens, src []byte) {
|
|||
sCandidate := e.table[nextHashS]
|
||||
lCandidate := e.bTable[nextHashL]
|
||||
next := load6432(src, nextS)
|
||||
entry := tableEntry{offset: s + e.cur, val: uint32(cv)}
|
||||
entry := tableEntry{offset: s + e.cur}
|
||||
e.table[nextHashS] = entry
|
||||
eLong := &e.bTable[nextHashL]
|
||||
eLong.Cur, eLong.Prev = entry, eLong.Cur
|
||||
|
|
@ -109,17 +112,17 @@ func (e *fastEncL6) Encode(dst *tokens, src []byte) {
|
|||
|
||||
t = lCandidate.Cur.offset - e.cur
|
||||
if s-t < maxMatchOffset {
|
||||
if uint32(cv) == lCandidate.Cur.val {
|
||||
if uint32(cv) == load3232(src, lCandidate.Cur.offset-e.cur) {
|
||||
// Long candidate matches at least 4 bytes.
|
||||
|
||||
// Store the next match
|
||||
e.table[nextHashS] = tableEntry{offset: nextS + e.cur, val: uint32(next)}
|
||||
e.table[nextHashS] = tableEntry{offset: nextS + e.cur}
|
||||
eLong := &e.bTable[nextHashL]
|
||||
eLong.Cur, eLong.Prev = tableEntry{offset: nextS + e.cur, val: uint32(next)}, eLong.Cur
|
||||
eLong.Cur, eLong.Prev = tableEntry{offset: nextS + e.cur}, eLong.Cur
|
||||
|
||||
// Check the previous long candidate as well.
|
||||
t2 := lCandidate.Prev.offset - e.cur
|
||||
if s-t2 < maxMatchOffset && uint32(cv) == lCandidate.Prev.val {
|
||||
if s-t2 < maxMatchOffset && uint32(cv) == load3232(src, lCandidate.Prev.offset-e.cur) {
|
||||
l = e.matchlen(s+4, t+4, src) + 4
|
||||
ml1 := e.matchlen(s+4, t2+4, src) + 4
|
||||
if ml1 > l {
|
||||
|
|
@ -132,17 +135,17 @@ func (e *fastEncL6) Encode(dst *tokens, src []byte) {
|
|||
}
|
||||
// Current value did not match, but check if previous long value does.
|
||||
t = lCandidate.Prev.offset - e.cur
|
||||
if s-t < maxMatchOffset && uint32(cv) == lCandidate.Prev.val {
|
||||
if s-t < maxMatchOffset && uint32(cv) == load3232(src, lCandidate.Prev.offset-e.cur) {
|
||||
// Store the next match
|
||||
e.table[nextHashS] = tableEntry{offset: nextS + e.cur, val: uint32(next)}
|
||||
e.table[nextHashS] = tableEntry{offset: nextS + e.cur}
|
||||
eLong := &e.bTable[nextHashL]
|
||||
eLong.Cur, eLong.Prev = tableEntry{offset: nextS + e.cur, val: uint32(next)}, eLong.Cur
|
||||
eLong.Cur, eLong.Prev = tableEntry{offset: nextS + e.cur}, eLong.Cur
|
||||
break
|
||||
}
|
||||
}
|
||||
|
||||
t = sCandidate.offset - e.cur
|
||||
if s-t < maxMatchOffset && uint32(cv) == sCandidate.val {
|
||||
if s-t < maxMatchOffset && uint32(cv) == load3232(src, sCandidate.offset-e.cur) {
|
||||
// Found a 4 match...
|
||||
l = e.matchlen(s+4, t+4, src) + 4
|
||||
|
||||
|
|
@ -150,9 +153,9 @@ func (e *fastEncL6) Encode(dst *tokens, src []byte) {
|
|||
lCandidate = e.bTable[nextHashL]
|
||||
|
||||
// Store the next match
|
||||
e.table[nextHashS] = tableEntry{offset: nextS + e.cur, val: uint32(next)}
|
||||
e.table[nextHashS] = tableEntry{offset: nextS + e.cur}
|
||||
eLong := &e.bTable[nextHashL]
|
||||
eLong.Cur, eLong.Prev = tableEntry{offset: nextS + e.cur, val: uint32(next)}, eLong.Cur
|
||||
eLong.Cur, eLong.Prev = tableEntry{offset: nextS + e.cur}, eLong.Cur
|
||||
|
||||
// Check repeat at s + repOff
|
||||
const repOff = 1
|
||||
|
|
@ -171,7 +174,7 @@ func (e *fastEncL6) Encode(dst *tokens, src []byte) {
|
|||
// If the next long is a candidate, use that...
|
||||
t2 = lCandidate.Cur.offset - e.cur
|
||||
if nextS-t2 < maxMatchOffset {
|
||||
if lCandidate.Cur.val == uint32(next) {
|
||||
if load3232(src, lCandidate.Cur.offset-e.cur) == uint32(next) {
|
||||
ml := e.matchlen(nextS+4, t2+4, src) + 4
|
||||
if ml > l {
|
||||
t = t2
|
||||
|
|
@ -182,7 +185,7 @@ func (e *fastEncL6) Encode(dst *tokens, src []byte) {
|
|||
}
|
||||
// If the previous long is a candidate, use that...
|
||||
t2 = lCandidate.Prev.offset - e.cur
|
||||
if nextS-t2 < maxMatchOffset && lCandidate.Prev.val == uint32(next) {
|
||||
if nextS-t2 < maxMatchOffset && load3232(src, lCandidate.Prev.offset-e.cur) == uint32(next) {
|
||||
ml := e.matchlen(nextS+4, t2+4, src) + 4
|
||||
if ml > l {
|
||||
t = t2
|
||||
|
|
@ -241,9 +244,9 @@ func (e *fastEncL6) Encode(dst *tokens, src []byte) {
|
|||
// Index after match end.
|
||||
for i := nextS + 1; i < int32(len(src))-8; i += 2 {
|
||||
cv := load6432(src, i)
|
||||
e.table[hash4x64(cv, tableBits)] = tableEntry{offset: i + e.cur, val: uint32(cv)}
|
||||
e.table[hash4x64(cv, tableBits)] = tableEntry{offset: i + e.cur}
|
||||
eLong := &e.bTable[hash7(cv, tableBits)]
|
||||
eLong.Cur, eLong.Prev = tableEntry{offset: i + e.cur, val: uint32(cv)}, eLong.Cur
|
||||
eLong.Cur, eLong.Prev = tableEntry{offset: i + e.cur}, eLong.Cur
|
||||
}
|
||||
goto emitRemainder
|
||||
}
|
||||
|
|
@ -252,8 +255,8 @@ func (e *fastEncL6) Encode(dst *tokens, src []byte) {
|
|||
if true {
|
||||
for i := nextS + 1; i < s-1; i += 2 {
|
||||
cv := load6432(src, i)
|
||||
t := tableEntry{offset: i + e.cur, val: uint32(cv)}
|
||||
t2 := tableEntry{offset: t.offset + 1, val: uint32(cv >> 8)}
|
||||
t := tableEntry{offset: i + e.cur}
|
||||
t2 := tableEntry{offset: t.offset + 1}
|
||||
eLong := &e.bTable[hash7(cv, tableBits)]
|
||||
eLong2 := &e.bTable[hash7(cv>>8, tableBits)]
|
||||
e.table[hash4x64(cv, tableBits)] = t
|
||||
|
|
|
|||
|
|
@ -3,10 +3,13 @@ package flate
|
|||
import (
|
||||
"io"
|
||||
"math"
|
||||
"sync"
|
||||
)
|
||||
|
||||
const (
|
||||
maxStatelessBlock = math.MaxInt16
|
||||
// dictionary will be taken from maxStatelessBlock, so limit it.
|
||||
maxStatelessDict = 8 << 10
|
||||
|
||||
slTableBits = 13
|
||||
slTableSize = 1 << slTableBits
|
||||
|
|
@ -24,11 +27,11 @@ func (s *statelessWriter) Close() error {
|
|||
}
|
||||
s.closed = true
|
||||
// Emit EOF block
|
||||
return StatelessDeflate(s.dst, nil, true)
|
||||
return StatelessDeflate(s.dst, nil, true, nil)
|
||||
}
|
||||
|
||||
func (s *statelessWriter) Write(p []byte) (n int, err error) {
|
||||
err = StatelessDeflate(s.dst, p, false)
|
||||
err = StatelessDeflate(s.dst, p, false, nil)
|
||||
if err != nil {
|
||||
return 0, err
|
||||
}
|
||||
|
|
@ -49,11 +52,27 @@ func NewStatelessWriter(dst io.Writer) io.WriteCloser {
|
|||
return &statelessWriter{dst: dst}
|
||||
}
|
||||
|
||||
// bitWriterPool contains bit writers that can be reused.
|
||||
var bitWriterPool = sync.Pool{
|
||||
New: func() interface{} {
|
||||
return newHuffmanBitWriter(nil)
|
||||
},
|
||||
}
|
||||
|
||||
// StatelessDeflate allows to compress directly to a Writer without retaining state.
|
||||
// When returning everything will be flushed.
|
||||
func StatelessDeflate(out io.Writer, in []byte, eof bool) error {
|
||||
// Up to 8KB of an optional dictionary can be given which is presumed to presumed to precede the block.
|
||||
// Longer dictionaries will be truncated and will still produce valid output.
|
||||
// Sending nil dictionary is perfectly fine.
|
||||
func StatelessDeflate(out io.Writer, in []byte, eof bool, dict []byte) error {
|
||||
var dst tokens
|
||||
bw := newHuffmanBitWriter(out)
|
||||
bw := bitWriterPool.Get().(*huffmanBitWriter)
|
||||
bw.reset(out)
|
||||
defer func() {
|
||||
// don't keep a reference to our output
|
||||
bw.reset(nil)
|
||||
bitWriterPool.Put(bw)
|
||||
}()
|
||||
if eof && len(in) == 0 {
|
||||
// Just write an EOF block.
|
||||
// Could be faster...
|
||||
|
|
@ -62,35 +81,53 @@ func StatelessDeflate(out io.Writer, in []byte, eof bool) error {
|
|||
return bw.err
|
||||
}
|
||||
|
||||
// Truncate dict
|
||||
if len(dict) > maxStatelessDict {
|
||||
dict = dict[len(dict)-maxStatelessDict:]
|
||||
}
|
||||
|
||||
for len(in) > 0 {
|
||||
todo := in
|
||||
if len(todo) > maxStatelessBlock {
|
||||
todo = todo[:maxStatelessBlock]
|
||||
if len(todo) > maxStatelessBlock-len(dict) {
|
||||
todo = todo[:maxStatelessBlock-len(dict)]
|
||||
}
|
||||
in = in[len(todo):]
|
||||
uncompressed := todo
|
||||
if len(dict) > 0 {
|
||||
// combine dict and source
|
||||
bufLen := len(todo) + len(dict)
|
||||
combined := make([]byte, bufLen)
|
||||
copy(combined, dict)
|
||||
copy(combined[len(dict):], todo)
|
||||
todo = combined
|
||||
}
|
||||
// Compress
|
||||
statelessEnc(&dst, todo)
|
||||
statelessEnc(&dst, todo, int16(len(dict)))
|
||||
isEof := eof && len(in) == 0
|
||||
|
||||
if dst.n == 0 {
|
||||
bw.writeStoredHeader(len(todo), isEof)
|
||||
bw.writeStoredHeader(len(uncompressed), isEof)
|
||||
if bw.err != nil {
|
||||
return bw.err
|
||||
}
|
||||
bw.writeBytes(todo)
|
||||
} else if int(dst.n) > len(todo)-len(todo)>>4 {
|
||||
bw.writeBytes(uncompressed)
|
||||
} else if int(dst.n) > len(uncompressed)-len(uncompressed)>>4 {
|
||||
// If we removed less than 1/16th, huffman compress the block.
|
||||
bw.writeBlockHuff(isEof, todo, false)
|
||||
bw.writeBlockHuff(isEof, uncompressed, len(in) == 0)
|
||||
} else {
|
||||
bw.writeBlockDynamic(&dst, isEof, todo, false)
|
||||
}
|
||||
if bw.err != nil {
|
||||
return bw.err
|
||||
bw.writeBlockDynamic(&dst, isEof, uncompressed, len(in) == 0)
|
||||
}
|
||||
if len(in) > 0 {
|
||||
// Retain a dict if we have more
|
||||
dict = todo[len(todo)-maxStatelessDict:]
|
||||
dst.Reset()
|
||||
}
|
||||
if bw.err != nil {
|
||||
return bw.err
|
||||
}
|
||||
}
|
||||
if !eof {
|
||||
// Align.
|
||||
// Align, only a stored block can do that.
|
||||
bw.writeStoredHeader(0, false)
|
||||
}
|
||||
bw.flush()
|
||||
|
|
@ -116,7 +153,7 @@ func load6416(b []byte, i int16) uint64 {
|
|||
uint64(b[4])<<32 | uint64(b[5])<<40 | uint64(b[6])<<48 | uint64(b[7])<<56
|
||||
}
|
||||
|
||||
func statelessEnc(dst *tokens, src []byte) {
|
||||
func statelessEnc(dst *tokens, src []byte, startAt int16) {
|
||||
const (
|
||||
inputMargin = 12 - 1
|
||||
minNonLiteralBlockSize = 1 + 1 + inputMargin
|
||||
|
|
@ -130,15 +167,23 @@ func statelessEnc(dst *tokens, src []byte) {
|
|||
|
||||
// This check isn't in the Snappy implementation, but there, the caller
|
||||
// instead of the callee handles this case.
|
||||
if len(src) < minNonLiteralBlockSize {
|
||||
if len(src)-int(startAt) < minNonLiteralBlockSize {
|
||||
// We do not fill the token table.
|
||||
// This will be picked up by caller.
|
||||
dst.n = uint16(len(src))
|
||||
dst.n = 0
|
||||
return
|
||||
}
|
||||
// Index until startAt
|
||||
if startAt > 0 {
|
||||
cv := load3232(src, 0)
|
||||
for i := int16(0); i < startAt; i++ {
|
||||
table[hashSL(cv)] = tableEntry{offset: i}
|
||||
cv = (cv >> 8) | (uint32(src[i+4]) << 24)
|
||||
}
|
||||
}
|
||||
|
||||
s := int16(1)
|
||||
nextEmit := int16(0)
|
||||
s := startAt + 1
|
||||
nextEmit := startAt
|
||||
// sLimit is when to stop looking for offset/length copies. The inputMargin
|
||||
// lets us use a fast path for emitLiteral in the main loop, while we are
|
||||
// looking for copies.
|
||||
|
|
|
|||
|
|
@ -184,9 +184,7 @@ func (t *tokens) indexTokens(in []token) {
|
|||
t.Reset()
|
||||
for _, tok := range in {
|
||||
if tok < matchType {
|
||||
t.tokens[t.n] = tok
|
||||
t.litHist[tok]++
|
||||
t.n++
|
||||
t.AddLiteral(tok.literal())
|
||||
continue
|
||||
}
|
||||
t.AddMatch(uint32(tok.length()), tok.offset())
|
||||
|
|
@ -211,50 +209,60 @@ func (t *tokens) AddLiteral(lit byte) {
|
|||
t.nLits++
|
||||
}
|
||||
|
||||
// from https://stackoverflow.com/a/28730362
|
||||
func mFastLog2(val float32) float32 {
|
||||
ux := int32(math.Float32bits(val))
|
||||
log2 := (float32)(((ux >> 23) & 255) - 128)
|
||||
ux &= -0x7f800001
|
||||
ux += 127 << 23
|
||||
uval := math.Float32frombits(uint32(ux))
|
||||
log2 += ((-0.34484843)*uval+2.02466578)*uval - 0.67487759
|
||||
return log2
|
||||
}
|
||||
|
||||
// EstimatedBits will return an minimum size estimated by an *optimal*
|
||||
// compression of the block.
|
||||
// The size of the block
|
||||
func (t *tokens) EstimatedBits() int {
|
||||
shannon := float64(0)
|
||||
shannon := float32(0)
|
||||
bits := int(0)
|
||||
nMatches := 0
|
||||
if t.nLits > 0 {
|
||||
invTotal := 1.0 / float64(t.nLits)
|
||||
invTotal := 1.0 / float32(t.nLits)
|
||||
for _, v := range t.litHist[:] {
|
||||
if v > 0 {
|
||||
n := float64(v)
|
||||
shannon += math.Ceil(-math.Log2(n*invTotal) * n)
|
||||
n := float32(v)
|
||||
shannon += -mFastLog2(n*invTotal) * n
|
||||
}
|
||||
}
|
||||
// Just add 15 for EOB
|
||||
shannon += 15
|
||||
for _, v := range t.extraHist[1 : literalCount-256] {
|
||||
for i, v := range t.extraHist[1 : literalCount-256] {
|
||||
if v > 0 {
|
||||
n := float64(v)
|
||||
shannon += math.Ceil(-math.Log2(n*invTotal) * n)
|
||||
bits += int(lengthExtraBits[v&31]) * int(v)
|
||||
n := float32(v)
|
||||
shannon += -mFastLog2(n*invTotal) * n
|
||||
bits += int(lengthExtraBits[i&31]) * int(v)
|
||||
nMatches += int(v)
|
||||
}
|
||||
}
|
||||
}
|
||||
if nMatches > 0 {
|
||||
invTotal := 1.0 / float64(nMatches)
|
||||
for _, v := range t.offHist[:offsetCodeCount] {
|
||||
invTotal := 1.0 / float32(nMatches)
|
||||
for i, v := range t.offHist[:offsetCodeCount] {
|
||||
if v > 0 {
|
||||
n := float64(v)
|
||||
shannon += math.Ceil(-math.Log2(n*invTotal) * n)
|
||||
bits += int(offsetExtraBits[v&31]) * int(n)
|
||||
n := float32(v)
|
||||
shannon += -mFastLog2(n*invTotal) * n
|
||||
bits += int(offsetExtraBits[i&31]) * int(v)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
return int(shannon) + bits
|
||||
}
|
||||
|
||||
// AddMatch adds a match to the tokens.
|
||||
// This function is very sensitive to inlining and right on the border.
|
||||
func (t *tokens) AddMatch(xlength uint32, xoffset uint32) {
|
||||
if debugDecode {
|
||||
if debugDeflate {
|
||||
if xlength >= maxMatchLength+baseMatchLength {
|
||||
panic(fmt.Errorf("invalid length: %v", xlength))
|
||||
}
|
||||
|
|
@ -273,7 +281,7 @@ func (t *tokens) AddMatch(xlength uint32, xoffset uint32) {
|
|||
// AddMatchLong adds a match to the tokens, potentially longer than max match length.
|
||||
// Length should NOT have the base subtracted, only offset should.
|
||||
func (t *tokens) AddMatchLong(xlength int32, xoffset uint32) {
|
||||
if debugDecode {
|
||||
if debugDeflate {
|
||||
if xoffset >= maxMatchOffset+baseMatchOffset {
|
||||
panic(fmt.Errorf("invalid offset: %v", xoffset))
|
||||
}
|
||||
|
|
|
|||
|
|
@ -207,7 +207,7 @@ func (z *Writer) Write(p []byte) (int, error) {
|
|||
z.size += uint32(len(p))
|
||||
z.digest = crc32.Update(z.digest, crc32.IEEETable, p)
|
||||
if z.level == StatelessCompression {
|
||||
return len(p), flate.StatelessDeflate(z.w, p, false)
|
||||
return len(p), flate.StatelessDeflate(z.w, p, false, nil)
|
||||
}
|
||||
n, z.err = z.compressor.Write(p)
|
||||
return n, z.err
|
||||
|
|
@ -255,7 +255,7 @@ func (z *Writer) Close() error {
|
|||
}
|
||||
}
|
||||
if z.level == StatelessCompression {
|
||||
z.err = flate.StatelessDeflate(z.w, nil, true)
|
||||
z.err = flate.StatelessDeflate(z.w, nil, true, nil)
|
||||
} else {
|
||||
z.err = z.compressor.Close()
|
||||
}
|
||||
|
|
|
|||
|
|
@ -2,8 +2,7 @@
|
|||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
// +build go1.11
|
||||
// +build !gccgo,!appengine
|
||||
// +build go1.11,!gccgo,!purego
|
||||
|
||||
package chacha20
|
||||
|
||||
|
|
|
|||
|
|
@ -2,8 +2,7 @@
|
|||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
// +build go1.11
|
||||
// +build !gccgo,!appengine
|
||||
// +build go1.11,!gccgo,!purego
|
||||
|
||||
#include "textflag.h"
|
||||
|
||||
|
|
|
|||
|
|
@ -136,6 +136,33 @@ func quarterRound(a, b, c, d uint32) (uint32, uint32, uint32, uint32) {
|
|||
return a, b, c, d
|
||||
}
|
||||
|
||||
// SetCounter sets the Cipher counter. The next invocation of XORKeyStream will
|
||||
// behave as if (64 * counter) bytes had been encrypted so far.
|
||||
//
|
||||
// To prevent accidental counter reuse, SetCounter panics if counter is
|
||||
// less than the current value.
|
||||
func (s *Cipher) SetCounter(counter uint32) {
|
||||
// Internally, s may buffer multiple blocks, which complicates this
|
||||
// implementation slightly. When checking whether the counter has rolled
|
||||
// back, we must use both s.counter and s.len to determine how many blocks
|
||||
// we have already output.
|
||||
outputCounter := s.counter - uint32(s.len)/blockSize
|
||||
if counter < outputCounter {
|
||||
panic("chacha20: SetCounter attempted to rollback counter")
|
||||
}
|
||||
|
||||
// In the general case, we set the new counter value and reset s.len to 0,
|
||||
// causing the next call to XORKeyStream to refill the buffer. However, if
|
||||
// we're advancing within the existing buffer, we can save work by simply
|
||||
// setting s.len.
|
||||
if counter < s.counter {
|
||||
s.len = int(s.counter-counter) * blockSize
|
||||
} else {
|
||||
s.counter = counter
|
||||
s.len = 0
|
||||
}
|
||||
}
|
||||
|
||||
// XORKeyStream XORs each byte in the given slice with a byte from the
|
||||
// cipher's key stream. Dst and src must overlap entirely or not at all.
|
||||
//
|
||||
|
|
|
|||
|
|
@ -2,7 +2,7 @@
|
|||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
// +build !arm64,!s390x,!ppc64le arm64,!go1.11 gccgo appengine
|
||||
// +build !arm64,!s390x,!ppc64le arm64,!go1.11 gccgo purego
|
||||
|
||||
package chacha20
|
||||
|
||||
|
|
|
|||
|
|
@ -2,7 +2,7 @@
|
|||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
// +build !gccgo,!appengine
|
||||
// +build !gccgo,!purego
|
||||
|
||||
package chacha20
|
||||
|
||||
|
|
|
|||
|
|
@ -19,7 +19,7 @@
|
|||
// The differences in this and the original implementation are
|
||||
// due to the calling conventions and initialization of constants.
|
||||
|
||||
// +build !gccgo,!appengine
|
||||
// +build !gccgo,!purego
|
||||
|
||||
#include "textflag.h"
|
||||
|
||||
|
|
|
|||
|
|
@ -2,7 +2,7 @@
|
|||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
// +build !gccgo,!appengine
|
||||
// +build !gccgo,!purego
|
||||
|
||||
package chacha20
|
||||
|
||||
|
|
|
|||
|
|
@ -2,7 +2,7 @@
|
|||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
// +build !gccgo,!appengine
|
||||
// +build !gccgo,!purego
|
||||
|
||||
#include "go_asm.h"
|
||||
#include "textflag.h"
|
||||
|
|
|
|||
|
|
@ -2,7 +2,7 @@
|
|||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
// +build !amd64,!ppc64le gccgo appengine
|
||||
// +build !amd64,!ppc64le gccgo purego
|
||||
|
||||
package poly1305
|
||||
|
||||
|
|
|
|||
|
|
@ -2,7 +2,7 @@
|
|||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
// +build amd64,!gccgo,!appengine
|
||||
// +build !gccgo,!purego
|
||||
|
||||
package poly1305
|
||||
|
||||
|
|
|
|||
|
|
@ -2,7 +2,7 @@
|
|||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
// +build amd64,!gccgo,!appengine
|
||||
// +build !gccgo,!purego
|
||||
|
||||
#include "textflag.h"
|
||||
|
||||
|
|
|
|||
|
|
@ -2,7 +2,7 @@
|
|||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
// +build s390x,!go1.11 !amd64,!s390x,!ppc64le gccgo appengine nacl
|
||||
// +build s390x,!go1.11 !amd64,!s390x,!ppc64le gccgo purego
|
||||
|
||||
package poly1305
|
||||
|
||||
|
|
|
|||
|
|
@ -2,7 +2,7 @@
|
|||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
// +build ppc64le,!gccgo,!appengine
|
||||
// +build !gccgo,!purego
|
||||
|
||||
package poly1305
|
||||
|
||||
|
|
|
|||
|
|
@ -2,7 +2,7 @@
|
|||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
// +build ppc64le,!gccgo,!appengine
|
||||
// +build !gccgo,!purego
|
||||
|
||||
#include "textflag.h"
|
||||
|
||||
|
|
|
|||
|
|
@ -2,7 +2,7 @@
|
|||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
// +build s390x,go1.11,!gccgo,!appengine
|
||||
// +build go1.11,!gccgo,!purego
|
||||
|
||||
package poly1305
|
||||
|
||||
|
|
|
|||
|
|
@ -2,7 +2,7 @@
|
|||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
// +build s390x,go1.11,!gccgo,!appengine
|
||||
// +build go1.11,!gccgo,!purego
|
||||
|
||||
#include "textflag.h"
|
||||
|
||||
|
|
|
|||
|
|
@ -2,7 +2,7 @@
|
|||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
// +build s390x,go1.11,!gccgo,!appengine
|
||||
// +build go1.11,!gccgo,!purego
|
||||
|
||||
#include "textflag.h"
|
||||
|
||||
|
|
|
|||
|
|
@ -562,9 +562,11 @@ func parseED25519(in []byte) (out PublicKey, rest []byte, err error) {
|
|||
return nil, nil, err
|
||||
}
|
||||
|
||||
key := ed25519.PublicKey(w.KeyBytes)
|
||||
if l := len(w.KeyBytes); l != ed25519.PublicKeySize {
|
||||
return nil, nil, fmt.Errorf("invalid size %d for Ed25519 public key", l)
|
||||
}
|
||||
|
||||
return (ed25519PublicKey)(key), w.Rest, nil
|
||||
return ed25519PublicKey(w.KeyBytes), w.Rest, nil
|
||||
}
|
||||
|
||||
func (k ed25519PublicKey) Marshal() []byte {
|
||||
|
|
@ -582,9 +584,11 @@ func (k ed25519PublicKey) Verify(b []byte, sig *Signature) error {
|
|||
if sig.Format != k.Type() {
|
||||
return fmt.Errorf("ssh: signature type %s for key type %s", sig.Format, k.Type())
|
||||
}
|
||||
if l := len(k); l != ed25519.PublicKeySize {
|
||||
return fmt.Errorf("ssh: invalid size %d for Ed25519 public key", l)
|
||||
}
|
||||
|
||||
edKey := (ed25519.PublicKey)(k)
|
||||
if ok := ed25519.Verify(edKey, b, sig.Blob); !ok {
|
||||
if ok := ed25519.Verify(ed25519.PublicKey(k), b, sig.Blob); !ok {
|
||||
return errors.New("ssh: signature did not verify")
|
||||
}
|
||||
|
||||
|
|
@ -838,6 +842,10 @@ func parseSKEd25519(in []byte) (out PublicKey, rest []byte, err error) {
|
|||
return nil, nil, err
|
||||
}
|
||||
|
||||
if l := len(w.KeyBytes); l != ed25519.PublicKeySize {
|
||||
return nil, nil, fmt.Errorf("invalid size %d for Ed25519 public key", l)
|
||||
}
|
||||
|
||||
key := new(skEd25519PublicKey)
|
||||
key.application = w.Application
|
||||
key.PublicKey = ed25519.PublicKey(w.KeyBytes)
|
||||
|
|
@ -862,6 +870,9 @@ func (k *skEd25519PublicKey) Verify(data []byte, sig *Signature) error {
|
|||
if sig.Format != k.Type() {
|
||||
return fmt.Errorf("ssh: signature type %s for key type %s", sig.Format, k.Type())
|
||||
}
|
||||
if l := len(k.PublicKey); l != ed25519.PublicKeySize {
|
||||
return fmt.Errorf("invalid size %d for Ed25519 public key", l)
|
||||
}
|
||||
|
||||
h := sha256.New()
|
||||
h.Write([]byte(k.application))
|
||||
|
|
@ -898,8 +909,7 @@ func (k *skEd25519PublicKey) Verify(data []byte, sig *Signature) error {
|
|||
|
||||
original := Marshal(blob)
|
||||
|
||||
edKey := (ed25519.PublicKey)(k.PublicKey)
|
||||
if ok := ed25519.Verify(edKey, original, edSig.Signature); !ok {
|
||||
if ok := ed25519.Verify(k.PublicKey, original, edSig.Signature); !ok {
|
||||
return errors.New("ssh: signature did not verify")
|
||||
}
|
||||
|
||||
|
|
@ -1051,7 +1061,10 @@ func NewPublicKey(key interface{}) (PublicKey, error) {
|
|||
case *dsa.PublicKey:
|
||||
return (*dsaPublicKey)(key), nil
|
||||
case ed25519.PublicKey:
|
||||
return (ed25519PublicKey)(key), nil
|
||||
if l := len(key); l != ed25519.PublicKeySize {
|
||||
return nil, fmt.Errorf("ssh: invalid size %d for Ed25519 public key", l)
|
||||
}
|
||||
return ed25519PublicKey(key), nil
|
||||
default:
|
||||
return nil, fmt.Errorf("ssh: unsupported key type %T", key)
|
||||
}
|
||||
|
|
@ -1304,7 +1317,6 @@ func parseOpenSSHPrivateKey(key []byte, decrypt openSSHDecryptFunc) (crypto.Priv
|
|||
return nil, errors.New("ssh: malformed OpenSSH key")
|
||||
}
|
||||
|
||||
// we only handle ed25519 and rsa keys currently
|
||||
switch pk1.Keytype {
|
||||
case KeyAlgoRSA:
|
||||
// https://github.com/openssh/openssh-portable/blob/master/sshkey.c#L2760-L2773
|
||||
|
|
|
|||
|
|
@ -29,7 +29,7 @@ const (
|
|||
|
||||
// Maximum allowed depth when recursively substituing variable names.
|
||||
depthValues = 99
|
||||
version = "1.51.1"
|
||||
version = "1.52.0"
|
||||
)
|
||||
|
||||
// Version returns current package version literal.
|
||||
|
|
|
|||
|
|
@ -453,7 +453,7 @@ func (f *File) parse(reader io.Reader) (err error) {
|
|||
|
||||
section.Comment = strings.TrimSpace(p.comment.String())
|
||||
|
||||
// Reset aotu-counter and comments
|
||||
// Reset auto-counter and comments
|
||||
p.comment.Reset()
|
||||
p.count = 1
|
||||
|
||||
|
|
|
|||
|
|
@ -305,14 +305,13 @@ func (s *Section) mapTo(val reflect.Value, isStrict bool) error {
|
|||
|
||||
if isAnonymous || isStruct || isStructPtr {
|
||||
if sec, err := s.f.GetSection(fieldName); err == nil {
|
||||
// Only set the field to non-nil struct value if we have
|
||||
// a section for it. Otherwise, we end up with a non-nil
|
||||
// struct ptr even though there is no data.
|
||||
// Only set the field to non-nil struct value if we have a section for it.
|
||||
// Otherwise, we end up with a non-nil struct ptr even though there is no data.
|
||||
if isStructPtr && field.IsNil() {
|
||||
field.Set(reflect.New(tpField.Type.Elem()))
|
||||
}
|
||||
if err = sec.mapTo(field, isStrict); err != nil {
|
||||
return fmt.Errorf("error mapping field(%s): %v", fieldName, err)
|
||||
return fmt.Errorf("error mapping field %q: %v", fieldName, err)
|
||||
}
|
||||
continue
|
||||
}
|
||||
|
|
@ -320,7 +319,7 @@ func (s *Section) mapTo(val reflect.Value, isStrict bool) error {
|
|||
if key, err := s.GetKey(fieldName); err == nil {
|
||||
delim := parseDelim(tpField.Tag.Get("delim"))
|
||||
if err = setWithProperType(tpField.Type, key, field, delim, allowShadow, isStrict); err != nil {
|
||||
return fmt.Errorf("error mapping field(%s): %v", fieldName, err)
|
||||
return fmt.Errorf("error mapping field %q: %v", fieldName, err)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
@ -512,6 +511,11 @@ func isEmptyValue(v reflect.Value) bool {
|
|||
return false
|
||||
}
|
||||
|
||||
// StructReflector is the interface implemented by struct types that can extract themselves into INI objects.
|
||||
type StructReflector interface {
|
||||
ReflectINIStruct(*File) error
|
||||
}
|
||||
|
||||
func (s *Section) reflectFrom(val reflect.Value) error {
|
||||
if val.Kind() == reflect.Ptr {
|
||||
val = val.Elem()
|
||||
|
|
@ -532,6 +536,10 @@ func (s *Section) reflectFrom(val reflect.Value) error {
|
|||
continue
|
||||
}
|
||||
|
||||
if r, ok := field.Interface().(StructReflector); ok {
|
||||
return r.ReflectINIStruct(s.f)
|
||||
}
|
||||
|
||||
fieldName := s.parseFieldName(tpField.Name, rawName)
|
||||
if len(fieldName) == 0 || !field.CanSet() {
|
||||
continue
|
||||
|
|
@ -552,12 +560,11 @@ func (s *Section) reflectFrom(val reflect.Value) error {
|
|||
}
|
||||
|
||||
if err = sec.reflectFrom(field); err != nil {
|
||||
return fmt.Errorf("error reflecting field (%s): %v", fieldName, err)
|
||||
return fmt.Errorf("error reflecting field %q: %v", fieldName, err)
|
||||
}
|
||||
continue
|
||||
}
|
||||
|
||||
// Note: Same reason as secion.
|
||||
key, err := s.GetKey(fieldName)
|
||||
if err != nil {
|
||||
key, _ = s.NewKey(fieldName, "")
|
||||
|
|
@ -568,8 +575,9 @@ func (s *Section) reflectFrom(val reflect.Value) error {
|
|||
key.Comment = tpField.Tag.Get("comment")
|
||||
}
|
||||
|
||||
if err = reflectWithProperType(tpField.Type, key, field, parseDelim(tpField.Tag.Get("delim")), allowShadow); err != nil {
|
||||
return fmt.Errorf("error reflecting field (%s): %v", fieldName, err)
|
||||
delim := parseDelim(tpField.Tag.Get("delim"))
|
||||
if err = reflectWithProperType(tpField.Type, key, field, delim, allowShadow); err != nil {
|
||||
return fmt.Errorf("error reflecting field %q: %v", fieldName, err)
|
||||
}
|
||||
|
||||
}
|
||||
|
|
|
|||
|
|
@ -10,11 +10,11 @@ gitea.com/macaron/cache/memcache
|
|||
gitea.com/macaron/cache/redis
|
||||
# gitea.com/macaron/captcha v0.0.0-20190822015246-daa973478bae
|
||||
gitea.com/macaron/captcha
|
||||
# gitea.com/macaron/cors v0.0.0-20190821152825-7dcef4a17175
|
||||
# gitea.com/macaron/cors v0.0.0-20190826180238-95aec09ea8b4
|
||||
gitea.com/macaron/cors
|
||||
# gitea.com/macaron/csrf v0.0.0-20190822024205-3dc5a4474439
|
||||
gitea.com/macaron/csrf
|
||||
# gitea.com/macaron/gzip v0.0.0-20191118033930-0c4c5566a0e5
|
||||
# gitea.com/macaron/gzip v0.0.0-20191118041502-506895b47aae
|
||||
gitea.com/macaron/gzip
|
||||
# gitea.com/macaron/i18n v0.0.0-20190822004228-474e714e2223
|
||||
gitea.com/macaron/i18n
|
||||
|
|
@ -22,7 +22,7 @@ gitea.com/macaron/i18n
|
|||
gitea.com/macaron/inject
|
||||
# gitea.com/macaron/macaron v1.4.0
|
||||
gitea.com/macaron/macaron
|
||||
# gitea.com/macaron/session v0.0.0-20190821211443-122c47c5f705
|
||||
# gitea.com/macaron/session v0.0.0-20191207215012-613cebf0674d
|
||||
gitea.com/macaron/session
|
||||
gitea.com/macaron/session/couchbase
|
||||
gitea.com/macaron/session/memcache
|
||||
|
|
@ -269,7 +269,7 @@ github.com/keybase/go-crypto/openpgp/errors
|
|||
github.com/keybase/go-crypto/openpgp/packet
|
||||
github.com/keybase/go-crypto/openpgp/s2k
|
||||
github.com/keybase/go-crypto/rsa
|
||||
# github.com/klauspost/compress v1.9.2
|
||||
# github.com/klauspost/compress v1.10.2
|
||||
github.com/klauspost/compress/flate
|
||||
github.com/klauspost/compress/gzip
|
||||
# github.com/kr/pretty v0.1.0
|
||||
|
|
@ -467,7 +467,7 @@ go.mongodb.org/mongo-driver/bson/bsonrw
|
|||
go.mongodb.org/mongo-driver/bson/bsontype
|
||||
go.mongodb.org/mongo-driver/bson/primitive
|
||||
go.mongodb.org/mongo-driver/x/bsonx/bsoncore
|
||||
# golang.org/x/crypto v0.0.0-20200219234226-1ad67e1f0ef4
|
||||
# golang.org/x/crypto v0.0.0-20200221231518-2aa609cf4a9d
|
||||
golang.org/x/crypto/acme
|
||||
golang.org/x/crypto/acme/autocert
|
||||
golang.org/x/crypto/argon2
|
||||
|
|
@ -570,7 +570,7 @@ gopkg.in/alexcesaro/quotedprintable.v3
|
|||
gopkg.in/asn1-ber.v1
|
||||
# gopkg.in/gomail.v2 v2.0.0-20160411212932-81ebce5c23df
|
||||
gopkg.in/gomail.v2
|
||||
# gopkg.in/ini.v1 v1.51.1
|
||||
# gopkg.in/ini.v1 v1.52.0
|
||||
gopkg.in/ini.v1
|
||||
# gopkg.in/ldap.v3 v3.0.2
|
||||
gopkg.in/ldap.v3
|
||||
|
|
|
|||
Loading…
Reference in New Issue