mirror of
https://github.com/fumiama/imoto.git
synced 2026-06-08 12:00:26 +08:00
61 lines
1.3 KiB
Go
61 lines
1.3 KiB
Go
package imoto
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import (
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"crypto/md5"
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"encoding/binary"
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"encoding/hex"
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"errors"
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"strconv"
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"strings"
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"unsafe"
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)
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func GetMD5(u string) (m [md5.Size]byte, err error) {
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u = strings.Trim(u, "/ ?&\n\t")
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if len(u) != md5.Size*2 && len(u) != md5.Size {
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err = errors.New("invalid path len: " + strconv.Itoa(len(u)))
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return
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}
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_, err = hex.Decode(m[:], StringToBytes(u))
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return
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}
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func SplitMD5(m [md5.Size]byte) (path uint64, key uint64) {
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path = binary.LittleEndian.Uint64(m[:8])
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key = binary.LittleEndian.Uint64(m[8:])
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return
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}
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func Uint64String(x uint64) string {
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var buf [8]byte
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binary.LittleEndian.PutUint64(buf[:], x)
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return hex.EncodeToString(buf[:])
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}
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// slice is the runtime representation of a slice.
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// It cannot be used safely or portably and its representation may
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// change in a later release.
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//
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// Unlike reflect.SliceHeader, its Data field is sufficient to guarantee the
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// data it references will not be garbage collected.
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type slice struct {
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data unsafe.Pointer
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len int
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cap int
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}
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// BytesToString 没有内存开销的转换
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func BytesToString(b []byte) string {
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return *(*string)(unsafe.Pointer(&b))
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}
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// StringToBytes 没有内存开销的转换
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func StringToBytes(s string) (b []byte) {
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bh := (*slice)(unsafe.Pointer(&b))
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sh := (*slice)(unsafe.Pointer(&s))
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bh.data = sh.data
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bh.len = sh.len
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bh.cap = sh.len
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return b
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}
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