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|
// +build !safe
// +build !appengine
// +build !ppc64le
// +build !mipsle
// +build !ppc64be
// +build !mips
// +build !s390x
package xxhash
import (
"reflect"
"unsafe"
)
// Backend returns the current version of xxhash being used.
const Backend = "GoUnsafe"
// ChecksumString32S returns the checksum of the input data, without creating a copy, with the specific seed.
func ChecksumString32S(s string, seed uint32) uint32 {
if len(s) == 0 {
return Checksum32S(nil, seed)
}
ss := (*reflect.StringHeader)(unsafe.Pointer(&s))
return Checksum32S((*[maxInt32]byte)(unsafe.Pointer(ss.Data))[:len(s):len(s)], seed)
}
func (xx *XXHash32) WriteString(s string) (int, error) {
if len(s) == 0 {
return 0, nil
}
ss := (*reflect.StringHeader)(unsafe.Pointer(&s))
return xx.Write((*[maxInt32]byte)(unsafe.Pointer(ss.Data))[:len(s):len(s)])
}
// ChecksumString64S returns the checksum of the input data, without creating a copy, with the specific seed.
func ChecksumString64S(s string, seed uint64) uint64 {
if len(s) == 0 {
return Checksum64S(nil, seed)
}
ss := (*reflect.StringHeader)(unsafe.Pointer(&s))
return Checksum64S((*[maxInt32]byte)(unsafe.Pointer(ss.Data))[:len(s):len(s)], seed)
}
func (xx *XXHash64) WriteString(s string) (int, error) {
if len(s) == 0 {
return 0, nil
}
ss := (*reflect.StringHeader)(unsafe.Pointer(&s))
return xx.Write((*[maxInt32]byte)(unsafe.Pointer(ss.Data))[:len(s):len(s)])
}
//go:nocheckptr
func checksum64(in []byte, seed uint64) uint64 {
var (
wordsLen = len(in) >> 3
words = ((*[maxInt32 / 8]uint64)(unsafe.Pointer(&in[0])))[:wordsLen:wordsLen]
v1, v2, v3, v4 = resetVs64(seed)
h uint64
i int
)
for ; i < len(words)-3; i += 4 {
words := (*[4]uint64)(unsafe.Pointer(&words[i]))
v1 = round64(v1, words[0])
v2 = round64(v2, words[1])
v3 = round64(v3, words[2])
v4 = round64(v4, words[3])
}
h = rotl64_1(v1) + rotl64_7(v2) + rotl64_12(v3) + rotl64_18(v4)
h = mergeRound64(h, v1)
h = mergeRound64(h, v2)
h = mergeRound64(h, v3)
h = mergeRound64(h, v4)
h += uint64(len(in))
for _, k := range words[i:] {
h ^= round64(0, k)
h = rotl64_27(h)*prime64x1 + prime64x4
}
if in = in[wordsLen<<3 : len(in) : len(in)]; len(in) > 3 {
words := (*[1]uint32)(unsafe.Pointer(&in[0]))
h ^= uint64(words[0]) * prime64x1
h = rotl64_23(h)*prime64x2 + prime64x3
in = in[4:len(in):len(in)]
}
for _, b := range in {
h ^= uint64(b) * prime64x5
h = rotl64_11(h) * prime64x1
}
return mix64(h)
}
//go:nocheckptr
func checksum64Short(in []byte, seed uint64) uint64 {
var (
h = seed + prime64x5 + uint64(len(in))
i int
)
if len(in) > 7 {
var (
wordsLen = len(in) >> 3
words = ((*[maxInt32 / 8]uint64)(unsafe.Pointer(&in[0])))[:wordsLen:wordsLen]
)
for i := range words {
h ^= round64(0, words[i])
h = rotl64_27(h)*prime64x1 + prime64x4
}
i = wordsLen << 3
}
if in = in[i:len(in):len(in)]; len(in) > 3 {
words := (*[1]uint32)(unsafe.Pointer(&in[0]))
h ^= uint64(words[0]) * prime64x1
h = rotl64_23(h)*prime64x2 + prime64x3
in = in[4:len(in):len(in)]
}
for _, b := range in {
h ^= uint64(b) * prime64x5
h = rotl64_11(h) * prime64x1
}
return mix64(h)
}
func (xx *XXHash64) Write(in []byte) (n int, err error) {
mem, idx := xx.mem[:], int(xx.memIdx)
xx.ln, n = xx.ln+uint64(len(in)), len(in)
if idx+len(in) < 32 {
xx.memIdx += int8(copy(mem[idx:len(mem):len(mem)], in))
return
}
var (
v1, v2, v3, v4 = xx.v1, xx.v2, xx.v3, xx.v4
i int
)
if d := 32 - int(idx); d > 0 && int(idx)+len(in) > 31 {
copy(mem[idx:len(mem):len(mem)], in[:len(in):len(in)])
words := (*[4]uint64)(unsafe.Pointer(&mem[0]))
v1 = round64(v1, words[0])
v2 = round64(v2, words[1])
v3 = round64(v3, words[2])
v4 = round64(v4, words[3])
if in, xx.memIdx = in[d:len(in):len(in)], 0; len(in) == 0 {
goto RET
}
}
for ; i < len(in)-31; i += 32 {
words := (*[4]uint64)(unsafe.Pointer(&in[i]))
v1 = round64(v1, words[0])
v2 = round64(v2, words[1])
v3 = round64(v3, words[2])
v4 = round64(v4, words[3])
}
if len(in)-i != 0 {
xx.memIdx += int8(copy(mem[xx.memIdx:len(mem):len(mem)], in[i:len(in):len(in)]))
}
RET:
xx.v1, xx.v2, xx.v3, xx.v4 = v1, v2, v3, v4
return
}
func (xx *XXHash64) Sum64() (h uint64) {
if seed := xx.seed; xx.ln > 31 {
v1, v2, v3, v4 := xx.v1, xx.v2, xx.v3, xx.v4
h = rotl64_1(v1) + rotl64_7(v2) + rotl64_12(v3) + rotl64_18(v4)
h = mergeRound64(h, v1)
h = mergeRound64(h, v2)
h = mergeRound64(h, v3)
h = mergeRound64(h, v4)
} else if seed == 0 {
h = prime64x5
} else {
h = seed + prime64x5
}
h += uint64(xx.ln)
if xx.memIdx == 0 {
return mix64(h)
}
var (
in = xx.mem[:xx.memIdx:xx.memIdx]
wordsLen = len(in) >> 3
words = ((*[maxInt32 / 8]uint64)(unsafe.Pointer(&in[0])))[:wordsLen:wordsLen]
)
for _, k := range words {
h ^= round64(0, k)
h = rotl64_27(h)*prime64x1 + prime64x4
}
if in = in[wordsLen<<3 : len(in) : len(in)]; len(in) > 3 {
words := (*[1]uint32)(unsafe.Pointer(&in[0]))
h ^= uint64(words[0]) * prime64x1
h = rotl64_23(h)*prime64x2 + prime64x3
in = in[4:len(in):len(in)]
}
for _, b := range in {
h ^= uint64(b) * prime64x5
h = rotl64_11(h) * prime64x1
}
return mix64(h)
}
|
