100 lines
3.4 KiB
Go
100 lines
3.4 KiB
Go
package msgp
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// size of every object on the wire,
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// plus type information. gives us
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// constant-time type information
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// for traversing composite objects.
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//
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var sizes = [256]bytespec{
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mnil: {size: 1, extra: constsize, typ: NilType},
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mfalse: {size: 1, extra: constsize, typ: BoolType},
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mtrue: {size: 1, extra: constsize, typ: BoolType},
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mbin8: {size: 2, extra: extra8, typ: BinType},
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mbin16: {size: 3, extra: extra16, typ: BinType},
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mbin32: {size: 5, extra: extra32, typ: BinType},
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mext8: {size: 3, extra: extra8, typ: ExtensionType},
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mext16: {size: 4, extra: extra16, typ: ExtensionType},
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mext32: {size: 6, extra: extra32, typ: ExtensionType},
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mfloat32: {size: 5, extra: constsize, typ: Float32Type},
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mfloat64: {size: 9, extra: constsize, typ: Float64Type},
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muint8: {size: 2, extra: constsize, typ: UintType},
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muint16: {size: 3, extra: constsize, typ: UintType},
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muint32: {size: 5, extra: constsize, typ: UintType},
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muint64: {size: 9, extra: constsize, typ: UintType},
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mint8: {size: 2, extra: constsize, typ: IntType},
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mint16: {size: 3, extra: constsize, typ: IntType},
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mint32: {size: 5, extra: constsize, typ: IntType},
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mint64: {size: 9, extra: constsize, typ: IntType},
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mfixext1: {size: 3, extra: constsize, typ: ExtensionType},
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mfixext2: {size: 4, extra: constsize, typ: ExtensionType},
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mfixext4: {size: 6, extra: constsize, typ: ExtensionType},
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mfixext8: {size: 10, extra: constsize, typ: ExtensionType},
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mfixext16: {size: 18, extra: constsize, typ: ExtensionType},
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mstr8: {size: 2, extra: extra8, typ: StrType},
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mstr16: {size: 3, extra: extra16, typ: StrType},
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mstr32: {size: 5, extra: extra32, typ: StrType},
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marray16: {size: 3, extra: array16v, typ: ArrayType},
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marray32: {size: 5, extra: array32v, typ: ArrayType},
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mmap16: {size: 3, extra: map16v, typ: MapType},
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mmap32: {size: 5, extra: map32v, typ: MapType},
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}
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func init() {
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// set up fixed fields
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// fixint
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for i := mfixint; i < 0x80; i++ {
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sizes[i] = bytespec{size: 1, extra: constsize, typ: IntType}
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}
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// nfixint
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for i := uint16(mnfixint); i < 0x100; i++ {
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sizes[uint8(i)] = bytespec{size: 1, extra: constsize, typ: IntType}
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}
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// fixstr gets constsize,
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// since the prefix yields the size
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for i := mfixstr; i < 0xc0; i++ {
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sizes[i] = bytespec{size: 1 + rfixstr(i), extra: constsize, typ: StrType}
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}
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// fixmap
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for i := mfixmap; i < 0x90; i++ {
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sizes[i] = bytespec{size: 1, extra: varmode(2 * rfixmap(i)), typ: MapType}
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}
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// fixarray
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for i := mfixarray; i < 0xa0; i++ {
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sizes[i] = bytespec{size: 1, extra: varmode(rfixarray(i)), typ: ArrayType}
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}
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}
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// a valid bytespsec has
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// non-zero 'size' and
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// non-zero 'typ'
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type bytespec struct {
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size uint8 // prefix size information
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extra varmode // extra size information
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typ Type // type
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_ byte // makes bytespec 4 bytes (yes, this matters)
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}
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// size mode
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// if positive, # elements for composites
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type varmode int8
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const (
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constsize varmode = 0 // constant size (size bytes + uint8(varmode) objects)
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extra8 = -1 // has uint8(p[1]) extra bytes
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extra16 = -2 // has be16(p[1:]) extra bytes
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extra32 = -3 // has be32(p[1:]) extra bytes
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map16v = -4 // use map16
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map32v = -5 // use map32
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array16v = -6 // use array16
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array32v = -7 // use array32
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)
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func getType(v byte) Type {
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return sizes[v].typ
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}
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