mirror of https://github.com/Xhofe/alist
99 lines
1.7 KiB
Go
99 lines
1.7 KiB
Go
package hash_extend
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import (
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"crypto/sha1"
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"encoding"
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"fmt"
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"hash"
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"strconv"
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"github.com/alist-org/alist/v3/pkg/utils"
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)
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var GCID = utils.RegisterHashWithParam("gcid", "GCID", 40, func(a ...any) hash.Hash {
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var (
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size int64
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err error
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)
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if len(a) > 0 {
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size, err = strconv.ParseInt(fmt.Sprint(a[0]), 10, 64)
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if err != nil {
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panic(err)
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}
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}
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return NewGcid(size)
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})
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func NewGcid(size int64) hash.Hash {
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calcBlockSize := func(j int64) int64 {
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var psize int64 = 0x40000
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for float64(j)/float64(psize) > 0x200 && psize < 0x200000 {
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psize = psize << 1
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}
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return psize
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}
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return &gcid{
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hash: sha1.New(),
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hashState: sha1.New(),
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blockSize: int(calcBlockSize(size)),
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}
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}
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type gcid struct {
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hash hash.Hash
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hashState hash.Hash
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blockSize int
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offset int
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}
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func (h *gcid) Write(p []byte) (n int, err error) {
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n = len(p)
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for len(p) > 0 {
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if h.offset < h.blockSize {
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var lastSize = h.blockSize - h.offset
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if lastSize > len(p) {
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lastSize = len(p)
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}
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h.hashState.Write(p[:lastSize])
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h.offset += lastSize
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p = p[lastSize:]
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}
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if h.offset >= h.blockSize {
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h.hash.Write(h.hashState.Sum(nil))
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h.hashState.Reset()
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h.offset = 0
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}
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}
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return
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}
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func (h *gcid) Sum(b []byte) []byte {
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if h.offset != 0 {
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if hashm, ok := h.hash.(encoding.BinaryMarshaler); ok {
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if hashum, ok := h.hash.(encoding.BinaryUnmarshaler); ok {
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tempData, _ := hashm.MarshalBinary()
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defer hashum.UnmarshalBinary(tempData)
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h.hash.Write(h.hashState.Sum(nil))
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}
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}
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}
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return h.hash.Sum(b)
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}
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func (h *gcid) Reset() {
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h.hash.Reset()
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h.hashState.Reset()
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}
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func (h *gcid) Size() int {
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return h.hash.Size()
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}
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func (h *gcid) BlockSize() int {
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return h.blockSize
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}
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