[VOL-1349] EPON ONU adapter (package B)
Change-Id: I609ba349c429bc7e87c74b66bb1121841f9caef6
diff --git a/vendor/github.com/pierrec/lz4/internal/xxh32/xxh32zero.go b/vendor/github.com/pierrec/lz4/internal/xxh32/xxh32zero.go
new file mode 100644
index 0000000..7a76a6b
--- /dev/null
+++ b/vendor/github.com/pierrec/lz4/internal/xxh32/xxh32zero.go
@@ -0,0 +1,223 @@
+// Package xxh32 implements the very fast XXH hashing algorithm (32 bits version).
+// (https://github.com/Cyan4973/XXH/)
+package xxh32
+
+import (
+ "encoding/binary"
+)
+
+const (
+ prime1 uint32 = 2654435761
+ prime2 uint32 = 2246822519
+ prime3 uint32 = 3266489917
+ prime4 uint32 = 668265263
+ prime5 uint32 = 374761393
+
+ primeMask = 0xFFFFFFFF
+ prime1plus2 = uint32((uint64(prime1) + uint64(prime2)) & primeMask) // 606290984
+ prime1minus = uint32((-int64(prime1)) & primeMask) // 1640531535
+)
+
+// XXHZero represents an xxhash32 object with seed 0.
+type XXHZero struct {
+ v1 uint32
+ v2 uint32
+ v3 uint32
+ v4 uint32
+ totalLen uint64
+ buf [16]byte
+ bufused int
+}
+
+// Sum appends the current hash to b and returns the resulting slice.
+// It does not change the underlying hash state.
+func (xxh XXHZero) Sum(b []byte) []byte {
+ h32 := xxh.Sum32()
+ return append(b, byte(h32), byte(h32>>8), byte(h32>>16), byte(h32>>24))
+}
+
+// Reset resets the Hash to its initial state.
+func (xxh *XXHZero) Reset() {
+ xxh.v1 = prime1plus2
+ xxh.v2 = prime2
+ xxh.v3 = 0
+ xxh.v4 = prime1minus
+ xxh.totalLen = 0
+ xxh.bufused = 0
+}
+
+// Size returns the number of bytes returned by Sum().
+func (xxh *XXHZero) Size() int {
+ return 4
+}
+
+// BlockSize gives the minimum number of bytes accepted by Write().
+func (xxh *XXHZero) BlockSize() int {
+ return 1
+}
+
+// Write adds input bytes to the Hash.
+// It never returns an error.
+func (xxh *XXHZero) Write(input []byte) (int, error) {
+ if xxh.totalLen == 0 {
+ xxh.Reset()
+ }
+ n := len(input)
+ m := xxh.bufused
+
+ xxh.totalLen += uint64(n)
+
+ r := len(xxh.buf) - m
+ if n < r {
+ copy(xxh.buf[m:], input)
+ xxh.bufused += len(input)
+ return n, nil
+ }
+
+ p := 0
+ // Causes compiler to work directly from registers instead of stack:
+ v1, v2, v3, v4 := xxh.v1, xxh.v2, xxh.v3, xxh.v4
+ if m > 0 {
+ // some data left from previous update
+ copy(xxh.buf[xxh.bufused:], input[:r])
+ xxh.bufused += len(input) - r
+
+ // fast rotl(13)
+ buf := xxh.buf[:16] // BCE hint.
+ v1 = rol13(v1+binary.LittleEndian.Uint32(buf[:])*prime2) * prime1
+ v2 = rol13(v2+binary.LittleEndian.Uint32(buf[4:])*prime2) * prime1
+ v3 = rol13(v3+binary.LittleEndian.Uint32(buf[8:])*prime2) * prime1
+ v4 = rol13(v4+binary.LittleEndian.Uint32(buf[12:])*prime2) * prime1
+ p = r
+ xxh.bufused = 0
+ }
+
+ for n := n - 16; p <= n; p += 16 {
+ sub := input[p:][:16] //BCE hint for compiler
+ v1 = rol13(v1+binary.LittleEndian.Uint32(sub[:])*prime2) * prime1
+ v2 = rol13(v2+binary.LittleEndian.Uint32(sub[4:])*prime2) * prime1
+ v3 = rol13(v3+binary.LittleEndian.Uint32(sub[8:])*prime2) * prime1
+ v4 = rol13(v4+binary.LittleEndian.Uint32(sub[12:])*prime2) * prime1
+ }
+ xxh.v1, xxh.v2, xxh.v3, xxh.v4 = v1, v2, v3, v4
+
+ copy(xxh.buf[xxh.bufused:], input[p:])
+ xxh.bufused += len(input) - p
+
+ return n, nil
+}
+
+// Sum32 returns the 32 bits Hash value.
+func (xxh *XXHZero) Sum32() uint32 {
+ h32 := uint32(xxh.totalLen)
+ if h32 >= 16 {
+ h32 += rol1(xxh.v1) + rol7(xxh.v2) + rol12(xxh.v3) + rol18(xxh.v4)
+ } else {
+ h32 += prime5
+ }
+
+ p := 0
+ n := xxh.bufused
+ buf := xxh.buf
+ for n := n - 4; p <= n; p += 4 {
+ h32 += binary.LittleEndian.Uint32(buf[p:p+4]) * prime3
+ h32 = rol17(h32) * prime4
+ }
+ for ; p < n; p++ {
+ h32 += uint32(buf[p]) * prime5
+ h32 = rol11(h32) * prime1
+ }
+
+ h32 ^= h32 >> 15
+ h32 *= prime2
+ h32 ^= h32 >> 13
+ h32 *= prime3
+ h32 ^= h32 >> 16
+
+ return h32
+}
+
+// ChecksumZero returns the 32bits Hash value.
+func ChecksumZero(input []byte) uint32 {
+ n := len(input)
+ h32 := uint32(n)
+
+ if n < 16 {
+ h32 += prime5
+ } else {
+ v1 := prime1plus2
+ v2 := prime2
+ v3 := uint32(0)
+ v4 := prime1minus
+ p := 0
+ for n := n - 16; p <= n; p += 16 {
+ sub := input[p:][:16] //BCE hint for compiler
+ v1 = rol13(v1+binary.LittleEndian.Uint32(sub[:])*prime2) * prime1
+ v2 = rol13(v2+binary.LittleEndian.Uint32(sub[4:])*prime2) * prime1
+ v3 = rol13(v3+binary.LittleEndian.Uint32(sub[8:])*prime2) * prime1
+ v4 = rol13(v4+binary.LittleEndian.Uint32(sub[12:])*prime2) * prime1
+ }
+ input = input[p:]
+ n -= p
+ h32 += rol1(v1) + rol7(v2) + rol12(v3) + rol18(v4)
+ }
+
+ p := 0
+ for n := n - 4; p <= n; p += 4 {
+ h32 += binary.LittleEndian.Uint32(input[p:p+4]) * prime3
+ h32 = rol17(h32) * prime4
+ }
+ for p < n {
+ h32 += uint32(input[p]) * prime5
+ h32 = rol11(h32) * prime1
+ p++
+ }
+
+ h32 ^= h32 >> 15
+ h32 *= prime2
+ h32 ^= h32 >> 13
+ h32 *= prime3
+ h32 ^= h32 >> 16
+
+ return h32
+}
+
+// Uint32Zero hashes x with seed 0.
+func Uint32Zero(x uint32) uint32 {
+ h := prime5 + 4 + x*prime3
+ h = rol17(h) * prime4
+ h ^= h >> 15
+ h *= prime2
+ h ^= h >> 13
+ h *= prime3
+ h ^= h >> 16
+ return h
+}
+
+func rol1(u uint32) uint32 {
+ return u<<1 | u>>31
+}
+
+func rol7(u uint32) uint32 {
+ return u<<7 | u>>25
+}
+
+func rol11(u uint32) uint32 {
+ return u<<11 | u>>21
+}
+
+func rol12(u uint32) uint32 {
+ return u<<12 | u>>20
+}
+
+func rol13(u uint32) uint32 {
+ return u<<13 | u>>19
+}
+
+func rol17(u uint32) uint32 {
+ return u<<17 | u>>15
+}
+
+func rol18(u uint32) uint32 {
+ return u<<18 | u>>14
+}