VOL-2496 Add "event listen" command to voltctl
Change-Id: I8f1fb34b55f56c8125142ac289e2f19fc170d804
diff --git a/vendor/github.com/pierrec/lz4/.gitignore b/vendor/github.com/pierrec/lz4/.gitignore
new file mode 100644
index 0000000..5e98735
--- /dev/null
+++ b/vendor/github.com/pierrec/lz4/.gitignore
@@ -0,0 +1,34 @@
+# 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
+
+cmd/*/*exe
+.idea
\ No newline at end of file
diff --git a/vendor/github.com/pierrec/lz4/.travis.yml b/vendor/github.com/pierrec/lz4/.travis.yml
new file mode 100644
index 0000000..fd6c6db
--- /dev/null
+++ b/vendor/github.com/pierrec/lz4/.travis.yml
@@ -0,0 +1,24 @@
+language: go
+
+env:
+ - GO111MODULE=off
+
+go:
+ - 1.9.x
+ - 1.10.x
+ - 1.11.x
+ - 1.12.x
+ - master
+
+matrix:
+ fast_finish: true
+ allow_failures:
+ - go: master
+
+sudo: false
+
+script:
+ - go test -v -cpu=2
+ - go test -v -cpu=2 -race
+ - go test -v -cpu=2 -tags noasm
+ - go test -v -cpu=2 -race -tags noasm
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..00899fb
--- /dev/null
+++ b/vendor/github.com/pierrec/lz4/README.md
@@ -0,0 +1,105 @@
+# lz4 : LZ4 compression in pure Go
+
+[](https://godoc.org/github.com/pierrec/lz4)
+[](https://travis-ci.org/pierrec/lz4)
+[](https://goreportcard.com/report/github.com/pierrec/lz4)
+[](https://github.com/pierrec/lz4/tags)
+
+## Overview
+
+This package provides a streaming interface to [LZ4 data streams](http://fastcompression.blogspot.fr/2013/04/lz4-streaming-format-final.html) as well as low level compress and uncompress functions for LZ4 data blocks.
+The implementation is based on the reference C [one](https://github.com/lz4/lz4).
+
+## Install
+
+Assuming you have the go toolchain installed:
+
+```
+go get github.com/pierrec/lz4
+```
+
+There is a command line interface tool to compress and decompress LZ4 files.
+
+```
+go install github.com/pierrec/lz4/cmd/lz4c
+```
+
+Usage
+
+```
+Usage of lz4c:
+ -version
+ print the program version
+
+Subcommands:
+Compress the given files or from stdin to stdout.
+compress [arguments] [<file name> ...]
+ -bc
+ enable block checksum
+ -l int
+ compression level (0=fastest)
+ -sc
+ disable stream checksum
+ -size string
+ block max size [64K,256K,1M,4M] (default "4M")
+
+Uncompress the given files or from stdin to stdout.
+uncompress [arguments] [<file name> ...]
+
+```
+
+
+## Example
+
+```
+// Compress and uncompress an input string.
+s := "hello world"
+r := strings.NewReader(s)
+
+// The pipe will uncompress the data from the writer.
+pr, pw := io.Pipe()
+zw := lz4.NewWriter(pw)
+zr := lz4.NewReader(pr)
+
+go func() {
+ // Compress the input string.
+ _, _ = io.Copy(zw, r)
+ _ = zw.Close() // Make sure the writer is closed
+ _ = pw.Close() // Terminate the pipe
+}()
+
+_, _ = io.Copy(os.Stdout, zr)
+
+// Output:
+// hello world
+```
+
+## Contributing
+
+Contributions are very welcome for bug fixing, performance improvements...!
+
+- Open an issue with a proper description
+- Send a pull request with appropriate test case(s)
+
+## Contributors
+
+Thanks to all contributors so far:
+
+- [@klauspost](https://github.com/klauspost)
+- [@heidawei](https://github.com/heidawei)
+- [@x4m](https://github.com/x4m)
+- [@Zariel](https://github.com/Zariel)
+- [@edwingeng](https://github.com/edwingeng)
+- [@danielmoy-google](https://github.com/danielmoy-google)
+- [@honda-tatsuya](https://github.com/honda-tatsuya)
+- [@h8liu](https://github.com/h8liu)
+- [@sbinet](https://github.com/sbinet)
+- [@fingon](https://github.com/fingon)
+- [@emfree](https://github.com/emfree)
+- [@lhemala](https://github.com/lhemala)
+- [@connor4312](https://github.com/connor4312)
+- [@oov](https://github.com/oov)
+- [@arya](https://github.com/arya)
+- [@ikkeps](https://github.com/ikkeps)
+
+Special thanks to [@Zariel](https://github.com/Zariel) for his asm implementation of the decoder
diff --git a/vendor/github.com/pierrec/lz4/block.go b/vendor/github.com/pierrec/lz4/block.go
new file mode 100644
index 0000000..5755cda
--- /dev/null
+++ b/vendor/github.com/pierrec/lz4/block.go
@@ -0,0 +1,387 @@
+package lz4
+
+import (
+ "encoding/binary"
+ "fmt"
+ "math/bits"
+)
+
+// blockHash hashes the lower 6 bytes into a value < htSize.
+func blockHash(x uint64) uint32 {
+ const prime6bytes = 227718039650203
+ return uint32(((x << (64 - 48)) * prime6bytes) >> (64 - hashLog))
+}
+
+// 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) (int, error) {
+ if len(src) == 0 {
+ return 0, nil
+ }
+ if di := decodeBlock(dst, src); di >= 0 {
+ return di, nil
+ }
+ return 0, ErrInvalidSourceShortBuffer
+}
+
+// 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 recoverBlock(&err)
+
+ // adaptSkipLog sets how quickly the compressor begins skipping blocks when data is incompressible.
+ // This significantly speeds up incompressible data and usually has very small impact on compresssion.
+ // bytes to skip = 1 + (bytes since last match >> adaptSkipLog)
+ const adaptSkipLog = 7
+ sn, dn := len(src)-mfLimit, len(dst)
+ if sn <= 0 || dn == 0 {
+ return 0, nil
+ }
+ if len(hashTable) < htSize {
+ return 0, fmt.Errorf("hash table too small, should be at least %d in size", htSize)
+ }
+ // Prove to the compiler the table has at least htSize elements.
+ // The compiler can see that "uint32() >> hashShift" cannot be out of bounds.
+ hashTable = hashTable[:htSize]
+
+ // si: Current position of the search.
+ // anchor: Position of the current literals.
+ var si, anchor int
+
+ // Fast scan strategy: the hash table only stores the last 4 bytes sequences.
+ for si < sn {
+ // Hash the next 6 bytes (sequence)...
+ match := binary.LittleEndian.Uint64(src[si:])
+ h := blockHash(match)
+ h2 := blockHash(match >> 8)
+
+ // We check a match at s, s+1 and s+2 and pick the first one we get.
+ // Checking 3 only requires us to load the source one.
+ ref := hashTable[h]
+ ref2 := hashTable[h2]
+ hashTable[h] = si
+ hashTable[h2] = si + 1
+ offset := si - ref
+
+ // If offset <= 0 we got an old entry in the hash table.
+ if offset <= 0 || offset >= winSize || // Out of window.
+ uint32(match) != binary.LittleEndian.Uint32(src[ref:]) { // Hash collision on different matches.
+ // No match. Start calculating another hash.
+ // The processor can usually do this out-of-order.
+ h = blockHash(match >> 16)
+ ref = hashTable[h]
+
+ // Check the second match at si+1
+ si += 1
+ offset = si - ref2
+
+ if offset <= 0 || offset >= winSize ||
+ uint32(match>>8) != binary.LittleEndian.Uint32(src[ref2:]) {
+ // No match. Check the third match at si+2
+ si += 1
+ offset = si - ref
+ hashTable[h] = si
+
+ if offset <= 0 || offset >= winSize ||
+ uint32(match>>16) != binary.LittleEndian.Uint32(src[ref:]) {
+ // Skip one extra byte (at si+3) before we check 3 matches again.
+ si += 2 + (si-anchor)>>adaptSkipLog
+ continue
+ }
+ }
+ }
+
+ // Match found.
+ lLen := si - anchor // Literal length.
+ // We already matched 4 bytes.
+ mLen := 4
+
+ // Extend backwards if we can, reducing literals.
+ tOff := si - offset - 1
+ for lLen > 0 && tOff >= 0 && src[si-1] == src[tOff] {
+ si--
+ tOff--
+ lLen--
+ mLen++
+ }
+
+ // Add the match length, so we continue search at the end.
+ // Use mLen to store the offset base.
+ si, mLen = si+mLen, si+minMatch
+
+ // Find the longest match by looking by batches of 8 bytes.
+ for si < sn {
+ x := binary.LittleEndian.Uint64(src[si:]) ^ binary.LittleEndian.Uint64(src[si-offset:])
+ if x == 0 {
+ si += 8
+ } else {
+ // Stop is first non-zero byte.
+ si += bits.TrailingZeros64(x) >> 3
+ break
+ }
+ }
+
+ 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:di+lLen], 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++
+ }
+ // Check if we can load next values.
+ if si >= sn {
+ break
+ }
+ // Hash match end-2
+ h = blockHash(binary.LittleEndian.Uint64(src[si-2:]))
+ hashTable[h] = si - 2
+ }
+
+ 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:di+len(src)-anchor], src[anchor:])
+ return di, nil
+}
+
+// blockHash hashes 4 bytes into a value < winSize.
+func blockHashHC(x uint32) uint32 {
+ const hasher uint32 = 2654435761 // Knuth multiplicative hash.
+ return x * hasher >> (32 - winSizeLog)
+}
+
+// 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 recoverBlock(&err)
+
+ // adaptSkipLog sets how quickly the compressor begins skipping blocks when data is incompressible.
+ // This significantly speeds up incompressible data and usually has very small impact on compresssion.
+ // bytes to skip = 1 + (bytes since last match >> adaptSkipLog)
+ const adaptSkipLog = 7
+
+ 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
+ // chainTable: 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 := blockHashHC(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 {
+ x := binary.LittleEndian.Uint64(src[next+ml:]) ^ binary.LittleEndian.Uint64(src[si+ml:])
+ if x == 0 {
+ ml += 8
+ } else {
+ // Stop is first non-zero byte.
+ ml += bits.TrailingZeros64(x) >> 3
+ break
+ }
+ }
+ 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 += 1 + (si-anchor)>>adaptSkipLog
+ 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 := blockHashHC(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:di+lLen], 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:di+len(src)-anchor], 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/decode_amd64.go b/vendor/github.com/pierrec/lz4/decode_amd64.go
new file mode 100644
index 0000000..43cc14f
--- /dev/null
+++ b/vendor/github.com/pierrec/lz4/decode_amd64.go
@@ -0,0 +1,8 @@
+// +build !appengine
+// +build gc
+// +build !noasm
+
+package lz4
+
+//go:noescape
+func decodeBlock(dst, src []byte) int
diff --git a/vendor/github.com/pierrec/lz4/decode_amd64.s b/vendor/github.com/pierrec/lz4/decode_amd64.s
new file mode 100644
index 0000000..20fef39
--- /dev/null
+++ b/vendor/github.com/pierrec/lz4/decode_amd64.s
@@ -0,0 +1,375 @@
+// +build !appengine
+// +build gc
+// +build !noasm
+
+#include "textflag.h"
+
+// AX scratch
+// BX scratch
+// CX scratch
+// DX token
+//
+// DI &dst
+// SI &src
+// R8 &dst + len(dst)
+// R9 &src + len(src)
+// R11 &dst
+// R12 short output end
+// R13 short input end
+// func decodeBlock(dst, src []byte) int
+// using 50 bytes of stack currently
+TEXT ·decodeBlock(SB), NOSPLIT, $64-56
+ MOVQ dst_base+0(FP), DI
+ MOVQ DI, R11
+ MOVQ dst_len+8(FP), R8
+ ADDQ DI, R8
+
+ MOVQ src_base+24(FP), SI
+ MOVQ src_len+32(FP), R9
+ ADDQ SI, R9
+
+ // shortcut ends
+ // short output end
+ MOVQ R8, R12
+ SUBQ $32, R12
+ // short input end
+ MOVQ R9, R13
+ SUBQ $16, R13
+
+loop:
+ // for si < len(src)
+ CMPQ SI, R9
+ JGE end
+
+ // token := uint32(src[si])
+ MOVBQZX (SI), DX
+ INCQ SI
+
+ // lit_len = token >> 4
+ // if lit_len > 0
+ // CX = lit_len
+ MOVQ DX, CX
+ SHRQ $4, CX
+
+ // if lit_len != 0xF
+ CMPQ CX, $0xF
+ JEQ lit_len_loop_pre
+ CMPQ DI, R12
+ JGE lit_len_loop_pre
+ CMPQ SI, R13
+ JGE lit_len_loop_pre
+
+ // copy shortcut
+
+ // A two-stage shortcut for the most common case:
+ // 1) If the literal length is 0..14, and there is enough space,
+ // enter the shortcut and copy 16 bytes on behalf of the literals
+ // (in the fast mode, only 8 bytes can be safely copied this way).
+ // 2) Further if the match length is 4..18, copy 18 bytes in a similar
+ // manner; but we ensure that there's enough space in the output for
+ // those 18 bytes earlier, upon entering the shortcut (in other words,
+ // there is a combined check for both stages).
+
+ // copy literal
+ MOVOU (SI), X0
+ MOVOU X0, (DI)
+ ADDQ CX, DI
+ ADDQ CX, SI
+
+ MOVQ DX, CX
+ ANDQ $0xF, CX
+
+ // The second stage: prepare for match copying, decode full info.
+ // If it doesn't work out, the info won't be wasted.
+ // offset := uint16(data[:2])
+ MOVWQZX (SI), DX
+ ADDQ $2, SI
+
+ MOVQ DI, AX
+ SUBQ DX, AX
+ CMPQ AX, DI
+ JGT err_short_buf
+
+ // if we can't do the second stage then jump straight to read the
+ // match length, we already have the offset.
+ CMPQ CX, $0xF
+ JEQ match_len_loop_pre
+ CMPQ DX, $8
+ JLT match_len_loop_pre
+ CMPQ AX, R11
+ JLT err_short_buf
+
+ // memcpy(op + 0, match + 0, 8);
+ MOVQ (AX), BX
+ MOVQ BX, (DI)
+ // memcpy(op + 8, match + 8, 8);
+ MOVQ 8(AX), BX
+ MOVQ BX, 8(DI)
+ // memcpy(op +16, match +16, 2);
+ MOVW 16(AX), BX
+ MOVW BX, 16(DI)
+
+ ADDQ $4, DI // minmatch
+ ADDQ CX, DI
+
+ // shortcut complete, load next token
+ JMP loop
+
+lit_len_loop_pre:
+ // if lit_len > 0
+ CMPQ CX, $0
+ JEQ offset
+ CMPQ CX, $0xF
+ JNE copy_literal
+
+lit_len_loop:
+ // for src[si] == 0xFF
+ CMPB (SI), $0xFF
+ JNE lit_len_finalise
+
+ // bounds check src[si+1]
+ MOVQ SI, AX
+ ADDQ $1, AX
+ CMPQ AX, R9
+ JGT err_short_buf
+
+ // lit_len += 0xFF
+ ADDQ $0xFF, CX
+ INCQ SI
+ JMP lit_len_loop
+
+lit_len_finalise:
+ // lit_len += int(src[si])
+ // si++
+ MOVBQZX (SI), AX
+ ADDQ AX, CX
+ INCQ SI
+
+copy_literal:
+ // bounds check src and dst
+ MOVQ SI, AX
+ ADDQ CX, AX
+ CMPQ AX, R9
+ JGT err_short_buf
+
+ MOVQ DI, AX
+ ADDQ CX, AX
+ CMPQ AX, R8
+ JGT err_short_buf
+
+ // whats a good cut off to call memmove?
+ CMPQ CX, $16
+ JGT memmove_lit
+
+ // if len(dst[di:]) < 16
+ MOVQ R8, AX
+ SUBQ DI, AX
+ CMPQ AX, $16
+ JLT memmove_lit
+
+ // if len(src[si:]) < 16
+ MOVQ R9, AX
+ SUBQ SI, AX
+ CMPQ AX, $16
+ JLT memmove_lit
+
+ MOVOU (SI), X0
+ MOVOU X0, (DI)
+
+ JMP finish_lit_copy
+
+memmove_lit:
+ // memmove(to, from, len)
+ MOVQ DI, 0(SP)
+ MOVQ SI, 8(SP)
+ MOVQ CX, 16(SP)
+ // spill
+ MOVQ DI, 24(SP)
+ MOVQ SI, 32(SP)
+ MOVQ CX, 40(SP) // need len to inc SI, DI after
+ MOVB DX, 48(SP)
+ CALL runtime·memmove(SB)
+
+ // restore registers
+ MOVQ 24(SP), DI
+ MOVQ 32(SP), SI
+ MOVQ 40(SP), CX
+ MOVB 48(SP), DX
+
+ // recalc initial values
+ MOVQ dst_base+0(FP), R8
+ MOVQ R8, R11
+ ADDQ dst_len+8(FP), R8
+ MOVQ src_base+24(FP), R9
+ ADDQ src_len+32(FP), R9
+ MOVQ R8, R12
+ SUBQ $32, R12
+ MOVQ R9, R13
+ SUBQ $16, R13
+
+finish_lit_copy:
+ ADDQ CX, SI
+ ADDQ CX, DI
+
+ CMPQ SI, R9
+ JGE end
+
+offset:
+ // CX := mLen
+ // free up DX to use for offset
+ MOVQ DX, CX
+
+ MOVQ SI, AX
+ ADDQ $2, AX
+ CMPQ AX, R9
+ JGT err_short_buf
+
+ // offset
+ // DX := int(src[si]) | int(src[si+1])<<8
+ MOVWQZX (SI), DX
+ ADDQ $2, SI
+
+ // 0 offset is invalid
+ CMPQ DX, $0
+ JEQ err_corrupt
+
+ ANDB $0xF, CX
+
+match_len_loop_pre:
+ // if mlen != 0xF
+ CMPB CX, $0xF
+ JNE copy_match
+
+match_len_loop:
+ // for src[si] == 0xFF
+ // lit_len += 0xFF
+ CMPB (SI), $0xFF
+ JNE match_len_finalise
+
+ // bounds check src[si+1]
+ MOVQ SI, AX
+ ADDQ $1, AX
+ CMPQ AX, R9
+ JGT err_short_buf
+
+ ADDQ $0xFF, CX
+ INCQ SI
+ JMP match_len_loop
+
+match_len_finalise:
+ // lit_len += int(src[si])
+ // si++
+ MOVBQZX (SI), AX
+ ADDQ AX, CX
+ INCQ SI
+
+copy_match:
+ // mLen += minMatch
+ ADDQ $4, CX
+
+ // check we have match_len bytes left in dst
+ // di+match_len < len(dst)
+ MOVQ DI, AX
+ ADDQ CX, AX
+ CMPQ AX, R8
+ JGT err_short_buf
+
+ // DX = offset
+ // CX = match_len
+ // BX = &dst + (di - offset)
+ MOVQ DI, BX
+ SUBQ DX, BX
+
+ // check BX is within dst
+ // if BX < &dst
+ CMPQ BX, R11
+ JLT err_short_buf
+
+ // if offset + match_len < di
+ MOVQ BX, AX
+ ADDQ CX, AX
+ CMPQ DI, AX
+ JGT copy_interior_match
+
+ // AX := len(dst[:di])
+ // MOVQ DI, AX
+ // SUBQ R11, AX
+
+ // copy 16 bytes at a time
+ // if di-offset < 16 copy 16-(di-offset) bytes to di
+ // then do the remaining
+
+copy_match_loop:
+ // for match_len >= 0
+ // dst[di] = dst[i]
+ // di++
+ // i++
+ MOVB (BX), AX
+ MOVB AX, (DI)
+ INCQ DI
+ INCQ BX
+ DECQ CX
+
+ CMPQ CX, $0
+ JGT copy_match_loop
+
+ JMP loop
+
+copy_interior_match:
+ CMPQ CX, $16
+ JGT memmove_match
+
+ // if len(dst[di:]) < 16
+ MOVQ R8, AX
+ SUBQ DI, AX
+ CMPQ AX, $16
+ JLT memmove_match
+
+ MOVOU (BX), X0
+ MOVOU X0, (DI)
+
+ ADDQ CX, DI
+ JMP loop
+
+memmove_match:
+ // memmove(to, from, len)
+ MOVQ DI, 0(SP)
+ MOVQ BX, 8(SP)
+ MOVQ CX, 16(SP)
+ // spill
+ MOVQ DI, 24(SP)
+ MOVQ SI, 32(SP)
+ MOVQ CX, 40(SP) // need len to inc SI, DI after
+ CALL runtime·memmove(SB)
+
+ // restore registers
+ MOVQ 24(SP), DI
+ MOVQ 32(SP), SI
+ MOVQ 40(SP), CX
+
+ // recalc initial values
+ MOVQ dst_base+0(FP), R8
+ MOVQ R8, R11 // TODO: make these sensible numbers
+ ADDQ dst_len+8(FP), R8
+ MOVQ src_base+24(FP), R9
+ ADDQ src_len+32(FP), R9
+ MOVQ R8, R12
+ SUBQ $32, R12
+ MOVQ R9, R13
+ SUBQ $16, R13
+
+ ADDQ CX, DI
+ JMP loop
+
+err_corrupt:
+ MOVQ $-1, ret+48(FP)
+ RET
+
+err_short_buf:
+ MOVQ $-2, ret+48(FP)
+ RET
+
+end:
+ SUBQ R11, DI
+ MOVQ DI, ret+48(FP)
+ RET
diff --git a/vendor/github.com/pierrec/lz4/decode_other.go b/vendor/github.com/pierrec/lz4/decode_other.go
new file mode 100644
index 0000000..002519f
--- /dev/null
+++ b/vendor/github.com/pierrec/lz4/decode_other.go
@@ -0,0 +1,92 @@
+// +build !amd64 appengine !gc noasm
+
+package lz4
+
+func decodeBlock(dst, src []byte) (ret int) {
+ const hasError = -2
+ defer func() {
+ if recover() != nil {
+ ret = hasError
+ }
+ }()
+
+ var si, di int
+ for {
+ // Literals and match lengths (token).
+ b := int(src[si])
+ si++
+
+ // Literals.
+ if lLen := b >> 4; lLen > 0 {
+ switch {
+ case lLen < 0xF && di+18 < len(dst) && si+16 < len(src):
+ // Shortcut 1
+ // if we have enough room in src and dst, and the literals length
+ // is small enough (0..14) then copy all 16 bytes, even if not all
+ // are part of the literals.
+ copy(dst[di:], src[si:si+16])
+ si += lLen
+ di += lLen
+ if mLen := b & 0xF; mLen < 0xF {
+ // Shortcut 2
+ // if the match length (4..18) fits within the literals, then copy
+ // all 18 bytes, even if not all are part of the literals.
+ mLen += 4
+ if offset := int(src[si]) | int(src[si+1])<<8; mLen <= offset {
+ i := di - offset
+ copy(dst[di:], dst[i:i+18])
+ si += 2
+ di += mLen
+ continue
+ }
+ }
+ case lLen == 0xF:
+ for src[si] == 0xFF {
+ lLen += 0xFF
+ si++
+ }
+ lLen += int(src[si])
+ si++
+ fallthrough
+ default:
+ copy(dst[di:di+lLen], src[si:si+lLen])
+ si += lLen
+ di += lLen
+ }
+ }
+ if si >= len(src) {
+ return di
+ }
+
+ offset := int(src[si]) | int(src[si+1])<<8
+ if offset == 0 {
+ return hasError
+ }
+ si += 2
+
+ // Match.
+ mLen := b & 0xF
+ if mLen == 0xF {
+ for src[si] == 0xFF {
+ mLen += 0xFF
+ si++
+ }
+ mLen += int(src[si])
+ si++
+ }
+ mLen += minMatch
+
+ // Copy the match.
+ expanded := dst[di-offset:]
+ if mLen > offset {
+ // Efficiently copy the match dst[di-offset:di] into the dst slice.
+ bytesToCopy := offset * (mLen / offset)
+ for n := offset; n <= bytesToCopy+offset; n *= 2 {
+ copy(expanded[n:], expanded[:n])
+ }
+ di += bytesToCopy
+ mLen -= bytesToCopy
+ }
+ di += copy(dst[di:di+mLen], expanded[:mLen])
+ }
+}
diff --git a/vendor/github.com/pierrec/lz4/errors.go b/vendor/github.com/pierrec/lz4/errors.go
new file mode 100644
index 0000000..3e27894
--- /dev/null
+++ b/vendor/github.com/pierrec/lz4/errors.go
@@ -0,0 +1,28 @@
+package lz4
+
+import (
+ "errors"
+ "fmt"
+ "os"
+ rdebug "runtime/debug"
+)
+
+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")
+ // ErrBlockDependency is returned when attempting to decompress an archive created with block dependency.
+ ErrBlockDependency = errors.New("lz4: block dependency not supported")
+)
+
+func recoverBlock(e *error) {
+ if r := recover(); r != nil && *e == nil {
+ if debugFlag {
+ fmt.Fprintln(os.Stderr, r)
+ rdebug.PrintStack()
+ }
+ *e = ErrInvalidSourceShortBuffer
+ }
+}
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
+}
diff --git a/vendor/github.com/pierrec/lz4/lz4.go b/vendor/github.com/pierrec/lz4/lz4.go
new file mode 100644
index 0000000..cdbf961
--- /dev/null
+++ b/vendor/github.com/pierrec/lz4/lz4.go
@@ -0,0 +1,66 @@
+// 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 for fast compression.
+ hashLog = 16
+ htSize = 1 << hashLog
+
+ mfLimit = 8 + minMatch // The last match cannot start within the last 12 bytes.
+)
+
+// map the block max size id with its value in bytes: 64Kb, 256Kb, 1Mb and 4Mb.
+const (
+ blockSize64K = 64 << 10
+ blockSize256K = 256 << 10
+ blockSize1M = 1 << 20
+ blockSize4M = 4 << 20
+)
+
+var (
+ bsMapID = map[byte]int{4: blockSize64K, 5: blockSize256K, 6: blockSize1M, 7: blockSize4M}
+ bsMapValue = map[int]byte{blockSize64K: 4, blockSize256K: 5, blockSize1M: 6, blockSize4M: 7}
+)
+
+// 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..90e8efe
--- /dev/null
+++ b/vendor/github.com/pierrec/lz4/reader.go
@@ -0,0 +1,307 @@
+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
+ // Handler called when a block has been successfully read.
+ // It provides the number of bytes read.
+ OnBlockDone func(size int)
+
+ 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 ErrBlockDependency
+ }
+ 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")
+ }
+ // Reset uncompressed buffer
+ z.data = z.zdata[:cap(z.zdata)][len(z.zdata):]
+
+ // 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.OnBlockDone != nil {
+ z.OnBlockDone(int(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.OnBlockDone != nil {
+ z.OnBlockDone(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..804a68c
--- /dev/null
+++ b/vendor/github.com/pierrec/lz4/writer.go
@@ -0,0 +1,273 @@
+package lz4
+
+import (
+ "encoding/binary"
+ "fmt"
+ "io"
+
+ "github.com/pierrec/lz4/internal/xxh32"
+)
+
+// Writer implements the LZ4 frame encoder.
+type Writer struct {
+ Header
+ // Handler called when a block has been successfully written out.
+ // It provides the number of bytes written.
+ OnBlockDone func(size int)
+
+ 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.data = z.zdata[:bSize]
+ z.zdata = 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
+ }
+ written, err := z.dst.Write(zdata)
+ if err != nil {
+ return err
+ }
+ if h := z.OnBlockDone; h != nil {
+ h(written)
+ }
+
+ if !z.BlockChecksum {
+ if debugFlag {
+ debug("current frame checksum %x", z.checksum.Sum32())
+ }
+ return nil
+ }
+ checksum := xxh32.ChecksumZero(zdata)
+ if debugFlag {
+ debug("block checksum %x", checksum)
+ defer func() { debug("current frame checksum %x", z.checksum.Sum32()) }()
+ }
+ return z.writeUint32(checksum)
+}
+
+// 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
+ }
+
+ if err := z.compressBlock(z.data[:z.idx]); err != nil {
+ return err
+ }
+ z.idx = 0
+ return nil
+}
+
+// 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 {
+ return nil
+ }
+ checksum := z.checksum.Sum32()
+ if debugFlag {
+ debug("stream checksum %x", checksum)
+ }
+ return z.writeUint32(checksum)
+}
+
+// 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
+}