113 lines
2 KiB
Go
113 lines
2 KiB
Go
package nodb
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import (
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"encoding/binary"
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"errors"
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"reflect"
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"strconv"
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"unsafe"
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)
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var errIntNumber = errors.New("invalid integer")
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// no copy to change slice to string
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// use your own risk
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func String(b []byte) (s string) {
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pbytes := (*reflect.SliceHeader)(unsafe.Pointer(&b))
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pstring := (*reflect.StringHeader)(unsafe.Pointer(&s))
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pstring.Data = pbytes.Data
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pstring.Len = pbytes.Len
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return
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}
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// no copy to change string to slice
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// use your own risk
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func Slice(s string) (b []byte) {
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pbytes := (*reflect.SliceHeader)(unsafe.Pointer(&b))
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pstring := (*reflect.StringHeader)(unsafe.Pointer(&s))
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pbytes.Data = pstring.Data
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pbytes.Len = pstring.Len
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pbytes.Cap = pstring.Len
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return
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}
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func Int64(v []byte, err error) (int64, error) {
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if err != nil {
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return 0, err
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} else if v == nil || len(v) == 0 {
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return 0, nil
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} else if len(v) != 8 {
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return 0, errIntNumber
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}
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return int64(binary.LittleEndian.Uint64(v)), nil
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}
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func PutInt64(v int64) []byte {
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var b []byte
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pbytes := (*reflect.SliceHeader)(unsafe.Pointer(&b))
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pbytes.Data = uintptr(unsafe.Pointer(&v))
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pbytes.Len = 8
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pbytes.Cap = 8
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return b
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}
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func StrInt64(v []byte, err error) (int64, error) {
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if err != nil {
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return 0, err
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} else if v == nil {
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return 0, nil
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} else {
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return strconv.ParseInt(String(v), 10, 64)
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}
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}
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func StrInt32(v []byte, err error) (int32, error) {
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if err != nil {
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return 0, err
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} else if v == nil {
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return 0, nil
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} else {
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res, err := strconv.ParseInt(String(v), 10, 32)
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return int32(res), err
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}
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}
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func StrInt8(v []byte, err error) (int8, error) {
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if err != nil {
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return 0, err
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} else if v == nil {
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return 0, nil
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} else {
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res, err := strconv.ParseInt(String(v), 10, 8)
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return int8(res), err
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}
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}
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func StrPutInt64(v int64) []byte {
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return strconv.AppendInt(nil, v, 10)
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}
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func MinUInt32(a uint32, b uint32) uint32 {
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if a > b {
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return b
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} else {
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return a
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}
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}
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func MaxUInt32(a uint32, b uint32) uint32 {
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if a > b {
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return a
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} else {
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return b
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}
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}
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func MaxInt32(a int32, b int32) int32 {
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if a > b {
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return a
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} else {
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return b
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}
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}
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