[VOL-1386] This commit add "dep" as the package management tool
for voltha-go.
Change-Id: I52bc4911dd00a441756ec7c30f46d45091f3f90e
diff --git a/vendor/github.com/pierrec/lz4/.gitignore b/vendor/github.com/pierrec/lz4/.gitignore
new file mode 100644
index 0000000..e48bab3
--- /dev/null
+++ b/vendor/github.com/pierrec/lz4/.gitignore
@@ -0,0 +1,33 @@
+# Created by https://www.gitignore.io/api/macos
+
+### macOS ###
+*.DS_Store
+.AppleDouble
+.LSOverride
+
+# Icon must end with two \r
+Icon
+
+
+# Thumbnails
+._*
+
+# Files that might appear in the root of a volume
+.DocumentRevisions-V100
+.fseventsd
+.Spotlight-V100
+.TemporaryItems
+.Trashes
+.VolumeIcon.icns
+.com.apple.timemachine.donotpresent
+
+# Directories potentially created on remote AFP share
+.AppleDB
+.AppleDesktop
+Network Trash Folder
+Temporary Items
+.apdisk
+
+# End of https://www.gitignore.io/api/macos
+
+lz4c/lz4c
diff --git a/vendor/github.com/pierrec/lz4/.travis.yml b/vendor/github.com/pierrec/lz4/.travis.yml
new file mode 100644
index 0000000..204afe1
--- /dev/null
+++ b/vendor/github.com/pierrec/lz4/.travis.yml
@@ -0,0 +1,22 @@
+language: go
+
+env:
+ - GO111MODULE=off
+ - GO111MODULE=on
+
+go:
+ - 1.9.x
+ - 1.10.x
+ - 1.11.x
+ - master
+
+matrix:
+ fast_finish: true
+ allow_failures:
+ - go: master
+
+sudo: false
+
+script:
+ - go test -v -cpu=2
+ - go test -v -cpu=2 -race
diff --git a/vendor/github.com/pierrec/lz4/LICENSE b/vendor/github.com/pierrec/lz4/LICENSE
new file mode 100644
index 0000000..bd899d8
--- /dev/null
+++ b/vendor/github.com/pierrec/lz4/LICENSE
@@ -0,0 +1,28 @@
+Copyright (c) 2015, Pierre Curto
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+* Redistributions of source code must retain the above copyright notice, this
+ list of conditions and the following disclaimer.
+
+* Redistributions in binary form must reproduce the above copyright notice,
+ this list of conditions and the following disclaimer in the documentation
+ and/or other materials provided with the distribution.
+
+* Neither the name of xxHash nor the names of its
+ contributors may be used to endorse or promote products derived from
+ this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
diff --git a/vendor/github.com/pierrec/lz4/README.md b/vendor/github.com/pierrec/lz4/README.md
new file mode 100644
index 0000000..e71ebd5
--- /dev/null
+++ b/vendor/github.com/pierrec/lz4/README.md
@@ -0,0 +1,24 @@
+[](https://godoc.org/github.com/pierrec/lz4)
+
+# lz4
+LZ4 compression and decompression in pure Go.
+
+## Usage
+
+```go
+import "github.com/pierrec/lz4/v2"
+```
+
+## Description
+Package lz4 implements reading and writing lz4 compressed data (a frame),
+as specified in http://fastcompression.blogspot.fr/2013/04/lz4-streaming-format-final.html.
+
+This package is **compatible with the LZ4 frame format** although the block level compression
+and decompression functions are exposed and are fully compatible with the lz4 block format
+definition, they are low level and should not be used directly.
+
+For a complete description of an lz4 compressed block, see:
+http://fastcompression.blogspot.fr/2011/05/lz4-explained.html
+
+See https://github.com/Cyan4973/lz4 for the reference C implementation.
+
diff --git a/vendor/github.com/pierrec/lz4/block.go b/vendor/github.com/pierrec/lz4/block.go
new file mode 100644
index 0000000..00b1111
--- /dev/null
+++ b/vendor/github.com/pierrec/lz4/block.go
@@ -0,0 +1,397 @@
+package lz4
+
+import (
+ "encoding/binary"
+ "errors"
+)
+
+var (
+ // ErrInvalidSourceShortBuffer is returned by UncompressBlock or CompressBLock when a compressed
+ // block is corrupted or the destination buffer is not large enough for the uncompressed data.
+ ErrInvalidSourceShortBuffer = errors.New("lz4: invalid source or destination buffer too short")
+ // ErrInvalid is returned when reading an invalid LZ4 archive.
+ ErrInvalid = errors.New("lz4: bad magic number")
+)
+
+// blockHash hashes 4 bytes into a value < winSize.
+func blockHash(x uint32) uint32 {
+ const hasher uint32 = 2654435761 // Knuth multiplicative hash.
+ return x * hasher >> hashShift
+}
+
+// CompressBlockBound returns the maximum size of a given buffer of size n, when not compressible.
+func CompressBlockBound(n int) int {
+ return n + n/255 + 16
+}
+
+// UncompressBlock uncompresses the source buffer into the destination one,
+// and returns the uncompressed size.
+//
+// The destination buffer must be sized appropriately.
+//
+// An error is returned if the source data is invalid or the destination buffer is too small.
+func UncompressBlock(src, dst []byte) (si int, err error) {
+ defer func() {
+ // It is now faster to let the runtime panic and recover on out of bound slice access
+ // than checking indices as we go along.
+ if recover() != nil {
+ err = ErrInvalidSourceShortBuffer
+ }
+ }()
+ sn := len(src)
+ if sn == 0 {
+ return 0, nil
+ }
+ var di int
+
+ for {
+ // Literals and match lengths (token).
+ b := int(src[si])
+ si++
+
+ // Literals.
+ if lLen := b >> 4; lLen > 0 {
+ if lLen == 0xF {
+ for src[si] == 0xFF {
+ lLen += 0xFF
+ si++
+ }
+ lLen += int(src[si])
+ si++
+ }
+ i := si
+ si += lLen
+ di += copy(dst[di:], src[i:si])
+
+ if si >= sn {
+ return di, nil
+ }
+ }
+
+ si++
+ _ = src[si] // Bound check elimination.
+ offset := int(src[si-1]) | int(src[si])<<8
+ si++
+
+ // Match.
+ mLen := b & 0xF
+ if mLen == 0xF {
+ for src[si] == 0xFF {
+ mLen += 0xFF
+ si++
+ }
+ mLen += int(src[si])
+ si++
+ }
+ mLen += minMatch
+
+ // Copy the match.
+ i := di - offset
+ if offset > 0 && mLen >= offset {
+ // Efficiently copy the match dst[di-offset:di] into the dst slice.
+ bytesToCopy := offset * (mLen / offset)
+ expanded := dst[i:]
+ for n := offset; n <= bytesToCopy+offset; n *= 2 {
+ copy(expanded[n:], expanded[:n])
+ }
+ di += bytesToCopy
+ mLen -= bytesToCopy
+ }
+ di += copy(dst[di:], dst[i:i+mLen])
+ }
+}
+
+// CompressBlock compresses the source buffer into the destination one.
+// This is the fast version of LZ4 compression and also the default one.
+// The size of hashTable must be at least 64Kb.
+//
+// The size of the compressed data is returned. If it is 0 and no error, then the data is incompressible.
+//
+// An error is returned if the destination buffer is too small.
+func CompressBlock(src, dst []byte, hashTable []int) (di int, err error) {
+ defer func() {
+ if recover() != nil {
+ err = ErrInvalidSourceShortBuffer
+ }
+ }()
+
+ sn, dn := len(src)-mfLimit, len(dst)
+ if sn <= 0 || dn == 0 {
+ return 0, nil
+ }
+ var si int
+
+ // Fast scan strategy: the hash table only stores the last 4 bytes sequences.
+ // const accInit = 1 << skipStrength
+
+ anchor := si // Position of the current literals.
+ // acc := accInit // Variable step: improves performance on non-compressible data.
+
+ for si < sn {
+ // Hash the next 4 bytes (sequence)...
+ match := binary.LittleEndian.Uint32(src[si:])
+ h := blockHash(match)
+
+ ref := hashTable[h]
+ hashTable[h] = si
+ if ref >= sn { // Invalid reference (dirty hashtable).
+ si++
+ continue
+ }
+ offset := si - ref
+ if offset <= 0 || offset >= winSize || // Out of window.
+ match != binary.LittleEndian.Uint32(src[ref:]) { // Hash collision on different matches.
+ // si += acc >> skipStrength
+ // acc++
+ si++
+ continue
+ }
+
+ // Match found.
+ // acc = accInit
+ lLen := si - anchor // Literal length.
+
+ // Encode match length part 1.
+ si += minMatch
+ mLen := si // Match length has minMatch already.
+ // Find the longest match, first looking by batches of 8 bytes.
+ for si < sn && binary.LittleEndian.Uint64(src[si:]) == binary.LittleEndian.Uint64(src[si-offset:]) {
+ si += 8
+ }
+ // Then byte by byte.
+ for si < sn && src[si] == src[si-offset] {
+ si++
+ }
+
+ mLen = si - mLen
+ if mLen < 0xF {
+ dst[di] = byte(mLen)
+ } else {
+ dst[di] = 0xF
+ }
+
+ // Encode literals length.
+ if lLen < 0xF {
+ dst[di] |= byte(lLen << 4)
+ } else {
+ dst[di] |= 0xF0
+ di++
+ l := lLen - 0xF
+ for ; l >= 0xFF; l -= 0xFF {
+ dst[di] = 0xFF
+ di++
+ }
+ dst[di] = byte(l)
+ }
+ di++
+
+ // Literals.
+ copy(dst[di:], src[anchor:anchor+lLen])
+ di += lLen + 2
+ anchor = si
+
+ // Encode offset.
+ _ = dst[di] // Bound check elimination.
+ dst[di-2], dst[di-1] = byte(offset), byte(offset>>8)
+
+ // Encode match length part 2.
+ if mLen >= 0xF {
+ for mLen -= 0xF; mLen >= 0xFF; mLen -= 0xFF {
+ dst[di] = 0xFF
+ di++
+ }
+ dst[di] = byte(mLen)
+ di++
+ }
+ }
+
+ if anchor == 0 {
+ // Incompressible.
+ return 0, nil
+ }
+
+ // Last literals.
+ lLen := len(src) - anchor
+ if lLen < 0xF {
+ dst[di] = byte(lLen << 4)
+ } else {
+ dst[di] = 0xF0
+ di++
+ for lLen -= 0xF; lLen >= 0xFF; lLen -= 0xFF {
+ dst[di] = 0xFF
+ di++
+ }
+ dst[di] = byte(lLen)
+ }
+ di++
+
+ // Write the last literals.
+ if di >= anchor {
+ // Incompressible.
+ return 0, nil
+ }
+ di += copy(dst[di:], src[anchor:])
+ return di, nil
+}
+
+// CompressBlockHC compresses the source buffer src into the destination dst
+// with max search depth (use 0 or negative value for no max).
+//
+// CompressBlockHC compression ratio is better than CompressBlock but it is also slower.
+//
+// The size of the compressed data is returned. If it is 0 and no error, then the data is not compressible.
+//
+// An error is returned if the destination buffer is too small.
+func CompressBlockHC(src, dst []byte, depth int) (di int, err error) {
+ defer func() {
+ if recover() != nil {
+ err = ErrInvalidSourceShortBuffer
+ }
+ }()
+
+ sn, dn := len(src)-mfLimit, len(dst)
+ if sn <= 0 || dn == 0 {
+ return 0, nil
+ }
+ var si int
+
+ // hashTable: stores the last position found for a given hash
+ // chaingTable: stores previous positions for a given hash
+ var hashTable, chainTable [winSize]int
+
+ if depth <= 0 {
+ depth = winSize
+ }
+
+ anchor := si
+ for si < sn {
+ // Hash the next 4 bytes (sequence).
+ match := binary.LittleEndian.Uint32(src[si:])
+ h := blockHash(match)
+
+ // Follow the chain until out of window and give the longest match.
+ mLen := 0
+ offset := 0
+ for next, try := hashTable[h], depth; try > 0 && next > 0 && si-next < winSize; next = chainTable[next&winMask] {
+ // The first (mLen==0) or next byte (mLen>=minMatch) at current match length
+ // must match to improve on the match length.
+ if src[next+mLen] != src[si+mLen] {
+ continue
+ }
+ ml := 0
+ // Compare the current position with a previous with the same hash.
+ for ml < sn-si && binary.LittleEndian.Uint64(src[next+ml:]) == binary.LittleEndian.Uint64(src[si+ml:]) {
+ ml += 8
+ }
+ for ml < sn-si && src[next+ml] == src[si+ml] {
+ ml++
+ }
+ if ml < minMatch || ml <= mLen {
+ // Match too small (<minMath) or smaller than the current match.
+ continue
+ }
+ // Found a longer match, keep its position and length.
+ mLen = ml
+ offset = si - next
+ // Try another previous position with the same hash.
+ try--
+ }
+ chainTable[si&winMask] = hashTable[h]
+ hashTable[h] = si
+
+ // No match found.
+ if mLen == 0 {
+ si++
+ continue
+ }
+
+ // Match found.
+ // Update hash/chain tables with overlapping bytes:
+ // si already hashed, add everything from si+1 up to the match length.
+ winStart := si + 1
+ if ws := si + mLen - winSize; ws > winStart {
+ winStart = ws
+ }
+ for si, ml := winStart, si+mLen; si < ml; {
+ match >>= 8
+ match |= uint32(src[si+3]) << 24
+ h := blockHash(match)
+ chainTable[si&winMask] = hashTable[h]
+ hashTable[h] = si
+ si++
+ }
+
+ lLen := si - anchor
+ si += mLen
+ mLen -= minMatch // Match length does not include minMatch.
+
+ if mLen < 0xF {
+ dst[di] = byte(mLen)
+ } else {
+ dst[di] = 0xF
+ }
+
+ // Encode literals length.
+ if lLen < 0xF {
+ dst[di] |= byte(lLen << 4)
+ } else {
+ dst[di] |= 0xF0
+ di++
+ l := lLen - 0xF
+ for ; l >= 0xFF; l -= 0xFF {
+ dst[di] = 0xFF
+ di++
+ }
+ dst[di] = byte(l)
+ }
+ di++
+
+ // Literals.
+ copy(dst[di:], src[anchor:anchor+lLen])
+ di += lLen
+ anchor = si
+
+ // Encode offset.
+ di += 2
+ dst[di-2], dst[di-1] = byte(offset), byte(offset>>8)
+
+ // Encode match length part 2.
+ if mLen >= 0xF {
+ for mLen -= 0xF; mLen >= 0xFF; mLen -= 0xFF {
+ dst[di] = 0xFF
+ di++
+ }
+ dst[di] = byte(mLen)
+ di++
+ }
+ }
+
+ if anchor == 0 {
+ // Incompressible.
+ return 0, nil
+ }
+
+ // Last literals.
+ lLen := len(src) - anchor
+ if lLen < 0xF {
+ dst[di] = byte(lLen << 4)
+ } else {
+ dst[di] = 0xF0
+ di++
+ lLen -= 0xF
+ for ; lLen >= 0xFF; lLen -= 0xFF {
+ dst[di] = 0xFF
+ di++
+ }
+ dst[di] = byte(lLen)
+ }
+ di++
+
+ // Write the last literals.
+ if di >= anchor {
+ // Incompressible.
+ return 0, nil
+ }
+ di += copy(dst[di:], src[anchor:])
+ return di, nil
+}
diff --git a/vendor/github.com/pierrec/lz4/debug.go b/vendor/github.com/pierrec/lz4/debug.go
new file mode 100644
index 0000000..bc5e78d
--- /dev/null
+++ b/vendor/github.com/pierrec/lz4/debug.go
@@ -0,0 +1,23 @@
+// +build lz4debug
+
+package lz4
+
+import (
+ "fmt"
+ "os"
+ "path/filepath"
+ "runtime"
+)
+
+const debugFlag = true
+
+func debug(args ...interface{}) {
+ _, file, line, _ := runtime.Caller(1)
+ file = filepath.Base(file)
+
+ f := fmt.Sprintf("LZ4: %s:%d %s", file, line, args[0])
+ if f[len(f)-1] != '\n' {
+ f += "\n"
+ }
+ fmt.Fprintf(os.Stderr, f, args[1:]...)
+}
diff --git a/vendor/github.com/pierrec/lz4/debug_stub.go b/vendor/github.com/pierrec/lz4/debug_stub.go
new file mode 100644
index 0000000..44211ad
--- /dev/null
+++ b/vendor/github.com/pierrec/lz4/debug_stub.go
@@ -0,0 +1,7 @@
+// +build !lz4debug
+
+package lz4
+
+const debugFlag = false
+
+func debug(args ...interface{}) {}
diff --git a/vendor/github.com/pierrec/lz4/go.mod b/vendor/github.com/pierrec/lz4/go.mod
new file mode 100644
index 0000000..f9f570a
--- /dev/null
+++ b/vendor/github.com/pierrec/lz4/go.mod
@@ -0,0 +1,3 @@
+module github.com/pierrec/lz4
+
+require github.com/pkg/profile v1.2.1
diff --git a/vendor/github.com/pierrec/lz4/go.sum b/vendor/github.com/pierrec/lz4/go.sum
new file mode 100644
index 0000000..6ca7598
--- /dev/null
+++ b/vendor/github.com/pierrec/lz4/go.sum
@@ -0,0 +1,2 @@
+github.com/pkg/profile v1.2.1 h1:F++O52m40owAmADcojzM+9gyjmMOY/T4oYJkgFDH8RE=
+github.com/pkg/profile v1.2.1/go.mod h1:hJw3o1OdXxsrSjjVksARp5W95eeEaEfptyVZyv6JUPA=
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..850a6fd
--- /dev/null
+++ b/vendor/github.com/pierrec/lz4/internal/xxh32/xxh32zero.go
@@ -0,0 +1,222 @@
+// Package xxh32 implements the very fast XXH hashing algorithm (32 bits version).
+// (https://github.com/Cyan4973/XXH/)
+package xxh32
+
+import (
+ "encoding/binary"
+)
+
+const (
+ prime32_1 uint32 = 2654435761
+ prime32_2 uint32 = 2246822519
+ prime32_3 uint32 = 3266489917
+ prime32_4 uint32 = 668265263
+ prime32_5 uint32 = 374761393
+
+ prime32_1plus2 uint32 = 606290984
+ prime32_minus1 uint32 = 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 = prime32_1plus2
+ xxh.v2 = prime32_2
+ xxh.v3 = 0
+ xxh.v4 = prime32_minus1
+ 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[:])*prime32_2) * prime32_1
+ v2 = rol13(v2+binary.LittleEndian.Uint32(buf[4:])*prime32_2) * prime32_1
+ v3 = rol13(v3+binary.LittleEndian.Uint32(buf[8:])*prime32_2) * prime32_1
+ v4 = rol13(v4+binary.LittleEndian.Uint32(buf[12:])*prime32_2) * prime32_1
+ 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[:])*prime32_2) * prime32_1
+ v2 = rol13(v2+binary.LittleEndian.Uint32(sub[4:])*prime32_2) * prime32_1
+ v3 = rol13(v3+binary.LittleEndian.Uint32(sub[8:])*prime32_2) * prime32_1
+ v4 = rol13(v4+binary.LittleEndian.Uint32(sub[12:])*prime32_2) * prime32_1
+ }
+ 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 += prime32_5
+ }
+
+ p := 0
+ n := xxh.bufused
+ buf := xxh.buf
+ for n := n - 4; p <= n; p += 4 {
+ h32 += binary.LittleEndian.Uint32(buf[p:p+4]) * prime32_3
+ h32 = rol17(h32) * prime32_4
+ }
+ for ; p < n; p++ {
+ h32 += uint32(buf[p]) * prime32_5
+ h32 = rol11(h32) * prime32_1
+ }
+
+ h32 ^= h32 >> 15
+ h32 *= prime32_2
+ h32 ^= h32 >> 13
+ h32 *= prime32_3
+ 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 += prime32_5
+ } else {
+ v1 := prime32_1plus2
+ v2 := prime32_2
+ v3 := uint32(0)
+ v4 := prime32_minus1
+ 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[:])*prime32_2) * prime32_1
+ v2 = rol13(v2+binary.LittleEndian.Uint32(sub[4:])*prime32_2) * prime32_1
+ v3 = rol13(v3+binary.LittleEndian.Uint32(sub[8:])*prime32_2) * prime32_1
+ v4 = rol13(v4+binary.LittleEndian.Uint32(sub[12:])*prime32_2) * prime32_1
+ }
+ 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]) * prime32_3
+ h32 = rol17(h32) * prime32_4
+ }
+ for p < n {
+ h32 += uint32(input[p]) * prime32_5
+ h32 = rol11(h32) * prime32_1
+ p++
+ }
+
+ h32 ^= h32 >> 15
+ h32 *= prime32_2
+ h32 ^= h32 >> 13
+ h32 *= prime32_3
+ h32 ^= h32 >> 16
+
+ return h32
+}
+
+// Uint32Zero hashes x with seed 0.
+func Uint32Zero(x uint32) uint32 {
+ h := prime32_5 + 4 + x*prime32_3
+ h = rol17(h) * prime32_4
+ h ^= h >> 15
+ h *= prime32_2
+ h ^= h >> 13
+ h *= prime32_3
+ 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
+}
diff --git a/vendor/github.com/pierrec/lz4/lz4.go b/vendor/github.com/pierrec/lz4/lz4.go
new file mode 100644
index 0000000..3580275
--- /dev/null
+++ b/vendor/github.com/pierrec/lz4/lz4.go
@@ -0,0 +1,68 @@
+// Package lz4 implements reading and writing lz4 compressed data (a frame),
+// as specified in http://fastcompression.blogspot.fr/2013/04/lz4-streaming-format-final.html.
+//
+// Although the block level compression and decompression functions are exposed and are fully compatible
+// with the lz4 block format definition, they are low level and should not be used directly.
+// For a complete description of an lz4 compressed block, see:
+// http://fastcompression.blogspot.fr/2011/05/lz4-explained.html
+//
+// See https://github.com/Cyan4973/lz4 for the reference C implementation.
+//
+package lz4
+
+const (
+ // Extension is the LZ4 frame file name extension
+ Extension = ".lz4"
+ // Version is the LZ4 frame format version
+ Version = 1
+
+ frameMagic uint32 = 0x184D2204
+ frameSkipMagic uint32 = 0x184D2A50
+
+ // The following constants are used to setup the compression algorithm.
+ minMatch = 4 // the minimum size of the match sequence size (4 bytes)
+ winSizeLog = 16 // LZ4 64Kb window size limit
+ winSize = 1 << winSizeLog
+ winMask = winSize - 1 // 64Kb window of previous data for dependent blocks
+ compressedBlockFlag = 1 << 31
+ compressedBlockMask = compressedBlockFlag - 1
+
+ // hashLog determines the size of the hash table used to quickly find a previous match position.
+ // Its value influences the compression speed and memory usage, the lower the faster,
+ // but at the expense of the compression ratio.
+ // 16 seems to be the best compromise.
+ hashLog = 16
+ hashTableSize = 1 << hashLog
+ hashShift = uint((minMatch * 8) - hashLog)
+
+ mfLimit = 8 + minMatch // The last match cannot start within the last 12 bytes.
+ skipStrength = 6 // variable step for fast scan
+)
+
+// map the block max size id with its value in bytes: 64Kb, 256Kb, 1Mb and 4Mb.
+var (
+ bsMapID = map[byte]int{4: 64 << 10, 5: 256 << 10, 6: 1 << 20, 7: 4 << 20}
+ bsMapValue = make(map[int]byte, len(bsMapID))
+)
+
+// Reversed.
+func init() {
+ for i, v := range bsMapID {
+ bsMapValue[v] = i
+ }
+}
+
+// Header describes the various flags that can be set on a Writer or obtained from a Reader.
+// The default values match those of the LZ4 frame format definition
+// (http://fastcompression.blogspot.com/2013/04/lz4-streaming-format-final.html).
+//
+// NB. in a Reader, in case of concatenated frames, the Header values may change between Read() calls.
+// It is the caller responsibility to check them if necessary.
+type Header struct {
+ BlockChecksum bool // Compressed blocks checksum flag.
+ NoChecksum bool // Frame checksum flag.
+ BlockMaxSize int // Size of the uncompressed data block (one of [64KB, 256KB, 1MB, 4MB]). Default=4MB.
+ Size uint64 // Frame total size. It is _not_ computed by the Writer.
+ CompressionLevel int // Compression level (higher is better, use 0 for fastest compression).
+ done bool // Header processed flag (Read or Write and checked).
+}
diff --git a/vendor/github.com/pierrec/lz4/lz4_go1.10.go b/vendor/github.com/pierrec/lz4/lz4_go1.10.go
new file mode 100644
index 0000000..9a0fb00
--- /dev/null
+++ b/vendor/github.com/pierrec/lz4/lz4_go1.10.go
@@ -0,0 +1,29 @@
+//+build go1.10
+
+package lz4
+
+import (
+ "fmt"
+ "strings"
+)
+
+func (h Header) String() string {
+ var s strings.Builder
+
+ s.WriteString(fmt.Sprintf("%T{", h))
+ if h.BlockChecksum {
+ s.WriteString("BlockChecksum: true ")
+ }
+ if h.NoChecksum {
+ s.WriteString("NoChecksum: true ")
+ }
+ if bs := h.BlockMaxSize; bs != 0 && bs != 4<<20 {
+ s.WriteString(fmt.Sprintf("BlockMaxSize: %d ", bs))
+ }
+ if l := h.CompressionLevel; l != 0 {
+ s.WriteString(fmt.Sprintf("CompressionLevel: %d ", l))
+ }
+ s.WriteByte('}')
+
+ return s.String()
+}
diff --git a/vendor/github.com/pierrec/lz4/lz4_notgo1.10.go b/vendor/github.com/pierrec/lz4/lz4_notgo1.10.go
new file mode 100644
index 0000000..12c761a
--- /dev/null
+++ b/vendor/github.com/pierrec/lz4/lz4_notgo1.10.go
@@ -0,0 +1,29 @@
+//+build !go1.10
+
+package lz4
+
+import (
+ "bytes"
+ "fmt"
+)
+
+func (h Header) String() string {
+ var s bytes.Buffer
+
+ s.WriteString(fmt.Sprintf("%T{", h))
+ if h.BlockChecksum {
+ s.WriteString("BlockChecksum: true ")
+ }
+ if h.NoChecksum {
+ s.WriteString("NoChecksum: true ")
+ }
+ if bs := h.BlockMaxSize; bs != 0 && bs != 4<<20 {
+ s.WriteString(fmt.Sprintf("BlockMaxSize: %d ", bs))
+ }
+ if l := h.CompressionLevel; l != 0 {
+ s.WriteString(fmt.Sprintf("CompressionLevel: %d ", l))
+ }
+ s.WriteByte('}')
+
+ return s.String()
+}
diff --git a/vendor/github.com/pierrec/lz4/reader.go b/vendor/github.com/pierrec/lz4/reader.go
new file mode 100644
index 0000000..f08db47
--- /dev/null
+++ b/vendor/github.com/pierrec/lz4/reader.go
@@ -0,0 +1,295 @@
+package lz4
+
+import (
+ "encoding/binary"
+ "fmt"
+ "io"
+ "io/ioutil"
+
+ "github.com/pierrec/lz4/internal/xxh32"
+)
+
+// Reader implements the LZ4 frame decoder.
+// The Header is set after the first call to Read().
+// The Header may change between Read() calls in case of concatenated frames.
+type Reader struct {
+ Header
+
+ buf [8]byte // Scrap buffer.
+ pos int64 // Current position in src.
+ src io.Reader // Source.
+ zdata []byte // Compressed data.
+ data []byte // Uncompressed data.
+ idx int // Index of unread bytes into data.
+ checksum xxh32.XXHZero // Frame hash.
+}
+
+// NewReader returns a new LZ4 frame decoder.
+// No access to the underlying io.Reader is performed.
+func NewReader(src io.Reader) *Reader {
+ r := &Reader{src: src}
+ return r
+}
+
+// readHeader checks the frame magic number and parses the frame descriptoz.
+// Skippable frames are supported even as a first frame although the LZ4
+// specifications recommends skippable frames not to be used as first frames.
+func (z *Reader) readHeader(first bool) error {
+ defer z.checksum.Reset()
+
+ buf := z.buf[:]
+ for {
+ magic, err := z.readUint32()
+ if err != nil {
+ z.pos += 4
+ if !first && err == io.ErrUnexpectedEOF {
+ return io.EOF
+ }
+ return err
+ }
+ if magic == frameMagic {
+ break
+ }
+ if magic>>8 != frameSkipMagic>>8 {
+ return ErrInvalid
+ }
+ skipSize, err := z.readUint32()
+ if err != nil {
+ return err
+ }
+ z.pos += 4
+ m, err := io.CopyN(ioutil.Discard, z.src, int64(skipSize))
+ if err != nil {
+ return err
+ }
+ z.pos += m
+ }
+
+ // Header.
+ if _, err := io.ReadFull(z.src, buf[:2]); err != nil {
+ return err
+ }
+ z.pos += 8
+
+ b := buf[0]
+ if v := b >> 6; v != Version {
+ return fmt.Errorf("lz4: invalid version: got %d; expected %d", v, Version)
+ }
+ if b>>5&1 == 0 {
+ return fmt.Errorf("lz4: block dependency not supported")
+ }
+ z.BlockChecksum = b>>4&1 > 0
+ frameSize := b>>3&1 > 0
+ z.NoChecksum = b>>2&1 == 0
+
+ bmsID := buf[1] >> 4 & 0x7
+ bSize, ok := bsMapID[bmsID]
+ if !ok {
+ return fmt.Errorf("lz4: invalid block max size ID: %d", bmsID)
+ }
+ z.BlockMaxSize = bSize
+
+ // Allocate the compressed/uncompressed buffers.
+ // The compressed buffer cannot exceed the uncompressed one.
+ if n := 2 * bSize; cap(z.zdata) < n {
+ z.zdata = make([]byte, n, n)
+ }
+ if debugFlag {
+ debug("header block max size id=%d size=%d", bmsID, bSize)
+ }
+ z.zdata = z.zdata[:bSize]
+ z.data = z.zdata[:cap(z.zdata)][bSize:]
+ z.idx = len(z.data)
+
+ z.checksum.Write(buf[0:2])
+
+ if frameSize {
+ buf := buf[:8]
+ if _, err := io.ReadFull(z.src, buf); err != nil {
+ return err
+ }
+ z.Size = binary.LittleEndian.Uint64(buf)
+ z.pos += 8
+ z.checksum.Write(buf)
+ }
+
+ // Header checksum.
+ if _, err := io.ReadFull(z.src, buf[:1]); err != nil {
+ return err
+ }
+ z.pos++
+ if h := byte(z.checksum.Sum32() >> 8 & 0xFF); h != buf[0] {
+ return fmt.Errorf("lz4: invalid header checksum: got %x; expected %x", buf[0], h)
+ }
+
+ z.Header.done = true
+ if debugFlag {
+ debug("header read: %v", z.Header)
+ }
+
+ return nil
+}
+
+// Read decompresses data from the underlying source into the supplied buffer.
+//
+// Since there can be multiple streams concatenated, Header values may
+// change between calls to Read(). If that is the case, no data is actually read from
+// the underlying io.Reader, to allow for potential input buffer resizing.
+func (z *Reader) Read(buf []byte) (int, error) {
+ if debugFlag {
+ debug("Read buf len=%d", len(buf))
+ }
+ if !z.Header.done {
+ if err := z.readHeader(true); err != nil {
+ return 0, err
+ }
+ if debugFlag {
+ debug("header read OK compressed buffer %d / %d uncompressed buffer %d : %d index=%d",
+ len(z.zdata), cap(z.zdata), len(z.data), cap(z.data), z.idx)
+ }
+ }
+
+ if len(buf) == 0 {
+ return 0, nil
+ }
+
+ if z.idx == len(z.data) {
+ // No data ready for reading, process the next block.
+ if debugFlag {
+ debug("reading block from writer")
+ }
+ // Block length: 0 = end of frame, highest bit set: uncompressed.
+ bLen, err := z.readUint32()
+ if err != nil {
+ return 0, err
+ }
+ z.pos += 4
+
+ if bLen == 0 {
+ // End of frame reached.
+ if !z.NoChecksum {
+ // Validate the frame checksum.
+ checksum, err := z.readUint32()
+ if err != nil {
+ return 0, err
+ }
+ if debugFlag {
+ debug("frame checksum got=%x / want=%x", z.checksum.Sum32(), checksum)
+ }
+ z.pos += 4
+ if h := z.checksum.Sum32(); checksum != h {
+ return 0, fmt.Errorf("lz4: invalid frame checksum: got %x; expected %x", h, checksum)
+ }
+ }
+
+ // Get ready for the next concatenated frame and keep the position.
+ pos := z.pos
+ z.Reset(z.src)
+ z.pos = pos
+
+ // Since multiple frames can be concatenated, check for more.
+ return 0, z.readHeader(false)
+ }
+
+ if debugFlag {
+ debug("raw block size %d", bLen)
+ }
+ if bLen&compressedBlockFlag > 0 {
+ // Uncompressed block.
+ bLen &= compressedBlockMask
+ if debugFlag {
+ debug("uncompressed block size %d", bLen)
+ }
+ if int(bLen) > cap(z.data) {
+ return 0, fmt.Errorf("lz4: invalid block size: %d", bLen)
+ }
+ z.data = z.data[:bLen]
+ if _, err := io.ReadFull(z.src, z.data); err != nil {
+ return 0, err
+ }
+ z.pos += int64(bLen)
+
+ if z.BlockChecksum {
+ checksum, err := z.readUint32()
+ if err != nil {
+ return 0, err
+ }
+ z.pos += 4
+
+ if h := xxh32.ChecksumZero(z.data); h != checksum {
+ return 0, fmt.Errorf("lz4: invalid block checksum: got %x; expected %x", h, checksum)
+ }
+ }
+
+ } else {
+ // Compressed block.
+ if debugFlag {
+ debug("compressed block size %d", bLen)
+ }
+ if int(bLen) > cap(z.data) {
+ return 0, fmt.Errorf("lz4: invalid block size: %d", bLen)
+ }
+ zdata := z.zdata[:bLen]
+ if _, err := io.ReadFull(z.src, zdata); err != nil {
+ return 0, err
+ }
+ z.pos += int64(bLen)
+
+ if z.BlockChecksum {
+ checksum, err := z.readUint32()
+ if err != nil {
+ return 0, err
+ }
+ z.pos += 4
+
+ if h := xxh32.ChecksumZero(zdata); h != checksum {
+ return 0, fmt.Errorf("lz4: invalid block checksum: got %x; expected %x", h, checksum)
+ }
+ }
+
+ n, err := UncompressBlock(zdata, z.data)
+ if err != nil {
+ return 0, err
+ }
+ z.data = z.data[:n]
+ }
+
+ if !z.NoChecksum {
+ z.checksum.Write(z.data)
+ if debugFlag {
+ debug("current frame checksum %x", z.checksum.Sum32())
+ }
+ }
+ z.idx = 0
+ }
+
+ n := copy(buf, z.data[z.idx:])
+ z.idx += n
+ if debugFlag {
+ debug("copied %d bytes to input", n)
+ }
+
+ return n, nil
+}
+
+// Reset discards the Reader's state and makes it equivalent to the
+// result of its original state from NewReader, but reading from r instead.
+// This permits reusing a Reader rather than allocating a new one.
+func (z *Reader) Reset(r io.Reader) {
+ z.Header = Header{}
+ z.pos = 0
+ z.src = r
+ z.zdata = z.zdata[:0]
+ z.data = z.data[:0]
+ z.idx = 0
+ z.checksum.Reset()
+}
+
+// readUint32 reads an uint32 into the supplied buffer.
+// The idea is to make use of the already allocated buffers avoiding additional allocations.
+func (z *Reader) readUint32() (uint32, error) {
+ buf := z.buf[:4]
+ _, err := io.ReadFull(z.src, buf)
+ x := binary.LittleEndian.Uint32(buf)
+ return x, err
+}
diff --git a/vendor/github.com/pierrec/lz4/writer.go b/vendor/github.com/pierrec/lz4/writer.go
new file mode 100644
index 0000000..0120438
--- /dev/null
+++ b/vendor/github.com/pierrec/lz4/writer.go
@@ -0,0 +1,267 @@
+package lz4
+
+import (
+ "encoding/binary"
+ "fmt"
+ "io"
+
+ "github.com/pierrec/lz4/internal/xxh32"
+)
+
+// Writer implements the LZ4 frame encoder.
+type Writer struct {
+ Header
+
+ buf [19]byte // magic number(4) + header(flags(2)+[Size(8)+DictID(4)]+checksum(1)) does not exceed 19 bytes
+ dst io.Writer // Destination.
+ checksum xxh32.XXHZero // Frame checksum.
+ zdata []byte // Compressed data.
+ data []byte // Data to be compressed.
+ idx int // Index into data.
+ hashtable [winSize]int // Hash table used in CompressBlock().
+}
+
+// NewWriter returns a new LZ4 frame encoder.
+// No access to the underlying io.Writer is performed.
+// The supplied Header is checked at the first Write.
+// It is ok to change it before the first Write but then not until a Reset() is performed.
+func NewWriter(dst io.Writer) *Writer {
+ return &Writer{dst: dst}
+}
+
+// writeHeader builds and writes the header (magic+header) to the underlying io.Writer.
+func (z *Writer) writeHeader() error {
+ // Default to 4Mb if BlockMaxSize is not set.
+ if z.Header.BlockMaxSize == 0 {
+ z.Header.BlockMaxSize = bsMapID[7]
+ }
+ // The only option that needs to be validated.
+ bSize := z.Header.BlockMaxSize
+ bSizeID, ok := bsMapValue[bSize]
+ if !ok {
+ return fmt.Errorf("lz4: invalid block max size: %d", bSize)
+ }
+ // Allocate the compressed/uncompressed buffers.
+ // The compressed buffer cannot exceed the uncompressed one.
+ if n := 2 * bSize; cap(z.zdata) < n {
+ z.zdata = make([]byte, n, n)
+ }
+ z.zdata = z.zdata[:bSize]
+ z.data = z.zdata[:cap(z.zdata)][bSize:]
+ z.idx = 0
+
+ // Size is optional.
+ buf := z.buf[:]
+
+ // Set the fixed size data: magic number, block max size and flags.
+ binary.LittleEndian.PutUint32(buf[0:], frameMagic)
+ flg := byte(Version << 6)
+ flg |= 1 << 5 // No block dependency.
+ if z.Header.BlockChecksum {
+ flg |= 1 << 4
+ }
+ if z.Header.Size > 0 {
+ flg |= 1 << 3
+ }
+ if !z.Header.NoChecksum {
+ flg |= 1 << 2
+ }
+ buf[4] = flg
+ buf[5] = bSizeID << 4
+
+ // Current buffer size: magic(4) + flags(1) + block max size (1).
+ n := 6
+ // Optional items.
+ if z.Header.Size > 0 {
+ binary.LittleEndian.PutUint64(buf[n:], z.Header.Size)
+ n += 8
+ }
+
+ // The header checksum includes the flags, block max size and optional Size.
+ buf[n] = byte(xxh32.ChecksumZero(buf[4:n]) >> 8 & 0xFF)
+ z.checksum.Reset()
+
+ // Header ready, write it out.
+ if _, err := z.dst.Write(buf[0 : n+1]); err != nil {
+ return err
+ }
+ z.Header.done = true
+ if debugFlag {
+ debug("wrote header %v", z.Header)
+ }
+
+ return nil
+}
+
+// Write compresses data from the supplied buffer into the underlying io.Writer.
+// Write does not return until the data has been written.
+func (z *Writer) Write(buf []byte) (int, error) {
+ if !z.Header.done {
+ if err := z.writeHeader(); err != nil {
+ return 0, err
+ }
+ }
+ if debugFlag {
+ debug("input buffer len=%d index=%d", len(buf), z.idx)
+ }
+
+ zn := len(z.data)
+ var n int
+ for len(buf) > 0 {
+ if z.idx == 0 && len(buf) >= zn {
+ // Avoid a copy as there is enough data for a block.
+ if err := z.compressBlock(buf[:zn]); err != nil {
+ return n, err
+ }
+ n += zn
+ buf = buf[zn:]
+ continue
+ }
+ // Accumulate the data to be compressed.
+ m := copy(z.data[z.idx:], buf)
+ n += m
+ z.idx += m
+ buf = buf[m:]
+ if debugFlag {
+ debug("%d bytes copied to buf, current index %d", n, z.idx)
+ }
+
+ if z.idx < len(z.data) {
+ // Buffer not filled.
+ if debugFlag {
+ debug("need more data for compression")
+ }
+ return n, nil
+ }
+
+ // Buffer full.
+ if err := z.compressBlock(z.data); err != nil {
+ return n, err
+ }
+ z.idx = 0
+ }
+
+ return n, nil
+}
+
+// compressBlock compresses a block.
+func (z *Writer) compressBlock(data []byte) error {
+ if !z.NoChecksum {
+ z.checksum.Write(data)
+ }
+
+ // The compressed block size cannot exceed the input's.
+ var zn int
+ var err error
+
+ if level := z.Header.CompressionLevel; level != 0 {
+ zn, err = CompressBlockHC(data, z.zdata, level)
+ } else {
+ zn, err = CompressBlock(data, z.zdata, z.hashtable[:])
+ }
+
+ var zdata []byte
+ var bLen uint32
+ if debugFlag {
+ debug("block compression %d => %d", len(data), zn)
+ }
+ if err == nil && zn > 0 && zn < len(data) {
+ // Compressible and compressed size smaller than uncompressed: ok!
+ bLen = uint32(zn)
+ zdata = z.zdata[:zn]
+ } else {
+ // Uncompressed block.
+ bLen = uint32(len(data)) | compressedBlockFlag
+ zdata = data
+ }
+ if debugFlag {
+ debug("block compression to be written len=%d data len=%d", bLen, len(zdata))
+ }
+
+ // Write the block.
+ if err := z.writeUint32(bLen); err != nil {
+ return err
+ }
+ if _, err := z.dst.Write(zdata); err != nil {
+ return err
+ }
+
+ if z.BlockChecksum {
+ checksum := xxh32.ChecksumZero(zdata)
+ if debugFlag {
+ debug("block checksum %x", checksum)
+ }
+ if err := z.writeUint32(checksum); err != nil {
+ return err
+ }
+ }
+ if debugFlag {
+ debug("current frame checksum %x", z.checksum.Sum32())
+ }
+
+ return nil
+}
+
+// Flush flushes any pending compressed data to the underlying writer.
+// Flush does not return until the data has been written.
+// If the underlying writer returns an error, Flush returns that error.
+func (z *Writer) Flush() error {
+ if debugFlag {
+ debug("flush with index %d", z.idx)
+ }
+ if z.idx == 0 {
+ return nil
+ }
+
+ return z.compressBlock(z.data[:z.idx])
+}
+
+// Close closes the Writer, flushing any unwritten data to the underlying io.Writer, but does not close the underlying io.Writer.
+func (z *Writer) Close() error {
+ if !z.Header.done {
+ if err := z.writeHeader(); err != nil {
+ return err
+ }
+ }
+
+ if err := z.Flush(); err != nil {
+ return err
+ }
+
+ if debugFlag {
+ debug("writing last empty block")
+ }
+ if err := z.writeUint32(0); err != nil {
+ return err
+ }
+ if !z.NoChecksum {
+ checksum := z.checksum.Sum32()
+ if debugFlag {
+ debug("stream checksum %x", checksum)
+ }
+ if err := z.writeUint32(checksum); err != nil {
+ return err
+ }
+ }
+ return nil
+}
+
+// Reset clears the state of the Writer z such that it is equivalent to its
+// initial state from NewWriter, but instead writing to w.
+// No access to the underlying io.Writer is performed.
+func (z *Writer) Reset(w io.Writer) {
+ z.Header = Header{}
+ z.dst = w
+ z.checksum.Reset()
+ z.zdata = z.zdata[:0]
+ z.data = z.data[:0]
+ z.idx = 0
+}
+
+// writeUint32 writes a uint32 to the underlying writer.
+func (z *Writer) writeUint32(x uint32) error {
+ buf := z.buf[:4]
+ binary.LittleEndian.PutUint32(buf, x)
+ _, err := z.dst.Write(buf)
+ return err
+}