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vendor: github.com/klauspost/compress v1.15.0 

intermediate bump for easier review

full diff: https://github.com/klauspost/compress/compare/v1.14.3...v1.15.0

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
This commit is contained in:
Sebastiaan van Stijn 2022-03-16 15:16:28 +01:00
parent 2b7cb5b1bf
commit fdbb5953a6
No known key found for this signature in database
GPG Key ID: 76698F39D527CE8C
22 changed files with 1450 additions and 921 deletions
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2
vendor.mod
View File

@ -24,7 +24,7 @@ require (
github.com/google/go-cmp v0.5.7
github.com/google/shlex v0.0.0-20191202100458-e7afc7fbc510
github.com/imdario/mergo v0.3.12
github.com/klauspost/compress v1.14.3 // indirect
github.com/klauspost/compress v1.15.0 // indirect
github.com/mitchellh/mapstructure v1.3.2
github.com/moby/buildkit v0.8.2-0.20210615162540-9f254e18360a // master (v0.9.0-dev)
github.com/moby/sys/signal v0.7.0

4
vendor.sum
View File

@ -480,8 +480,8 @@ github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+o
github.com/klauspost/compress v1.11.3/go.mod h1:aoV0uJVorq1K+umq18yTdKaF57EivdYsUV+/s2qKfXs=
github.com/klauspost/compress v1.11.13/go.mod h1:aoV0uJVorq1K+umq18yTdKaF57EivdYsUV+/s2qKfXs=
github.com/klauspost/compress v1.12.3/go.mod h1:8dP1Hq4DHOhN9w426knH3Rhby4rFm6D8eO+e+Dq5Gzg=
github.com/klauspost/compress v1.14.3 h1:DQv1WP+iS4srNjibdnHtqu8JNWCDMluj5NzPnFJsnvk=
github.com/klauspost/compress v1.14.3/go.mod h1:/3/Vjq9QcHkK5uEr5lBEmyoZ1iFhe47etQ6QUkpK6sk=
github.com/klauspost/compress v1.15.0 h1:xqfchp4whNFxn5A4XFyyYtitiWI8Hy5EW59jEwcyL6U=
github.com/klauspost/compress v1.15.0/go.mod h1:/3/Vjq9QcHkK5uEr5lBEmyoZ1iFhe47etQ6QUkpK6sk=
github.com/konsorten/go-windows-terminal-sequences v1.0.1/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
github.com/konsorten/go-windows-terminal-sequences v1.0.2/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
github.com/konsorten/go-windows-terminal-sequences v1.0.3/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=

26
vendor/github.com/klauspost/compress/README.md generated vendored
View File

@ -17,6 +17,17 @@ This package provides various compression algorithms.
# changelog
* Feb 22, 2022 (v1.14.4)
* flate: Fix rare huffman only (-2) corruption. [#503](https://github.com/klauspost/compress/pull/503)
* zip: Update deprecated CreateHeaderRaw to correctly call CreateRaw by @saracen in [#502](https://github.com/klauspost/compress/pull/502)
* zip: don't read data descriptor early by @saracen in [#501](https://github.com/klauspost/compress/pull/501) #501
* huff0: Use static decompression buffer up to 30% faster by @klauspost in [#499](https://github.com/klauspost/compress/pull/499) [#500](https://github.com/klauspost/compress/pull/500)
* Feb 17, 2022 (v1.14.3)
* flate: Improve fastest levels compression speed ~10% more throughput. [#482](https://github.com/klauspost/compress/pull/482) [#489](https://github.com/klauspost/compress/pull/489) [#490](https://github.com/klauspost/compress/pull/490) [#491](https://github.com/klauspost/compress/pull/491) [#494](https://github.com/klauspost/compress/pull/494) [#478](https://github.com/klauspost/compress/pull/478)
* flate: Faster decompression speed, ~5-10%. [#483](https://github.com/klauspost/compress/pull/483)
* s2: Faster compression with Go v1.18 and amd64 microarch level 3+. [#484](https://github.com/klauspost/compress/pull/484) [#486](https://github.com/klauspost/compress/pull/486)
* Jan 25, 2022 (v1.14.2)
* zstd: improve header decoder by @dsnet [#476](https://github.com/klauspost/compress/pull/476)
* zstd: Add bigger default blocks [#469](https://github.com/klauspost/compress/pull/469)
@ -61,6 +72,9 @@ This package provides various compression algorithms.
* zstd: Detect short invalid signatures [#382](https://github.com/klauspost/compress/pull/382)
* zstd: Spawn decoder goroutine only if needed. [#380](https://github.com/klauspost/compress/pull/380)
<details>
<summary>See changes to v1.12.x</summary>
* May 25, 2021 (v1.12.3)
* deflate: Better/faster Huffman encoding [#374](https://github.com/klauspost/compress/pull/374)
* deflate: Allocate less for history. [#375](https://github.com/klauspost/compress/pull/375)
@ -82,9 +96,10 @@ This package provides various compression algorithms.
* s2c/s2d/s2sx: Always truncate when writing files [#352](https://github.com/klauspost/compress/pull/352)
* zstd: Reduce memory usage further when using [WithLowerEncoderMem](https://pkg.go.dev/github.com/klauspost/compress/zstd#WithLowerEncoderMem) [#346](https://github.com/klauspost/compress/pull/346)
* s2: Fix potential problem with amd64 assembly and profilers [#349](https://github.com/klauspost/compress/pull/349)
</details>
<details>
<summary>See changes prior to v1.12.1</summary>
<summary>See changes to v1.11.x</summary>
* Mar 26, 2021 (v1.11.13)
* zstd: Big speedup on small dictionary encodes [#344](https://github.com/klauspost/compress/pull/344) [#345](https://github.com/klauspost/compress/pull/345)
@ -143,7 +158,7 @@ This package provides various compression algorithms.
</details>
<details>
<summary>See changes prior to v1.11.0</summary>
<summary>See changes to v1.10.x</summary>
* July 8, 2020 (v1.10.11)
* zstd: Fix extra block when compressing with ReadFrom. [#278](https://github.com/klauspost/compress/pull/278)
@ -305,11 +320,6 @@ This package provides various compression algorithms.
# deflate usage
* [High Throughput Benchmark](http://blog.klauspost.com/go-gzipdeflate-benchmarks/).
* [Small Payload/Webserver Benchmarks](http://blog.klauspost.com/gzip-performance-for-go-webservers/).
* [Linear Time Compression](http://blog.klauspost.com/constant-time-gzipzip-compression/).
* [Re-balancing Deflate Compression Levels](https://blog.klauspost.com/rebalancing-deflate-compression-levels/)
The packages are drop-in replacements for standard libraries. Simply replace the import path to use them:
| old import | new import | Documentation
@ -331,6 +341,8 @@ Memory usage is typically 1MB for a Writer. stdlib is in the same range.
If you expect to have a lot of concurrently allocated Writers consider using
the stateless compress described below.
For compression performance, see: [this spreadsheet](https://docs.google.com/spreadsheets/d/1nuNE2nPfuINCZJRMt6wFWhKpToF95I47XjSsc-1rbPQ/edit?usp=sharing).
# Stateless compression
This package offers stateless compression as a special option for gzip/deflate.

121
vendor/github.com/klauspost/compress/huff0/bitreader.go generated vendored
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@ -8,115 +8,10 @@ package huff0
import (
"encoding/binary"
"errors"
"fmt"
"io"
)
// bitReader reads a bitstream in reverse.
// The last set bit indicates the start of the stream and is used
// for aligning the input.
type bitReader struct {
in []byte
off uint // next byte to read is at in[off - 1]
value uint64
bitsRead uint8
}
// init initializes and resets the bit reader.
func (b *bitReader) init(in []byte) error {
if len(in) < 1 {
return errors.New("corrupt stream: too short")
}
b.in = in
b.off = uint(len(in))
// The highest bit of the last byte indicates where to start
v := in[len(in)-1]
if v == 0 {
return errors.New("corrupt stream, did not find end of stream")
}
b.bitsRead = 64
b.value = 0
if len(in) >= 8 {
b.fillFastStart()
} else {
b.fill()
b.fill()
}
b.bitsRead += 8 - uint8(highBit32(uint32(v)))
return nil
}
// peekBitsFast requires that at least one bit is requested every time.
// There are no checks if the buffer is filled.
func (b *bitReader) peekBitsFast(n uint8) uint16 {
const regMask = 64 - 1
v := uint16((b.value << (b.bitsRead & regMask)) >> ((regMask + 1 - n) & regMask))
return v
}
// fillFast() will make sure at least 32 bits are available.
// There must be at least 4 bytes available.
func (b *bitReader) fillFast() {
if b.bitsRead < 32 {
return
}
// 2 bounds checks.
v := b.in[b.off-4 : b.off]
v = v[:4]
low := (uint32(v[0])) | (uint32(v[1]) << 8) | (uint32(v[2]) << 16) | (uint32(v[3]) << 24)
b.value = (b.value << 32) | uint64(low)
b.bitsRead -= 32
b.off -= 4
}
func (b *bitReader) advance(n uint8) {
b.bitsRead += n
}
// fillFastStart() assumes the bitreader is empty and there is at least 8 bytes to read.
func (b *bitReader) fillFastStart() {
// Do single re-slice to avoid bounds checks.
b.value = binary.LittleEndian.Uint64(b.in[b.off-8:])
b.bitsRead = 0
b.off -= 8
}
// fill() will make sure at least 32 bits are available.
func (b *bitReader) fill() {
if b.bitsRead < 32 {
return
}
if b.off > 4 {
v := b.in[b.off-4:]
v = v[:4]
low := (uint32(v[0])) | (uint32(v[1]) << 8) | (uint32(v[2]) << 16) | (uint32(v[3]) << 24)
b.value = (b.value << 32) | uint64(low)
b.bitsRead -= 32
b.off -= 4
return
}
for b.off > 0 {
b.value = (b.value << 8) | uint64(b.in[b.off-1])
b.bitsRead -= 8
b.off--
}
}
// finished returns true if all bits have been read from the bit stream.
func (b *bitReader) finished() bool {
return b.off == 0 && b.bitsRead >= 64
}
// close the bitstream and returns an error if out-of-buffer reads occurred.
func (b *bitReader) close() error {
// Release reference.
b.in = nil
if b.bitsRead > 64 {
return io.ErrUnexpectedEOF
}
return nil
}
// bitReader reads a bitstream in reverse.
// The last set bit indicates the start of the stream and is used
// for aligning the input.
@ -213,10 +108,17 @@ func (b *bitReaderBytes) finished() bool {
return b.off == 0 && b.bitsRead >= 64
}
func (b *bitReaderBytes) remaining() uint {
return b.off*8 + uint(64-b.bitsRead)
}
// close the bitstream and returns an error if out-of-buffer reads occurred.
func (b *bitReaderBytes) close() error {
// Release reference.
b.in = nil
if b.remaining() > 0 {
return fmt.Errorf("corrupt input: %d bits remain on stream", b.remaining())
}
if b.bitsRead > 64 {
return io.ErrUnexpectedEOF
}
@ -318,10 +220,17 @@ func (b *bitReaderShifted) finished() bool {
return b.off == 0 && b.bitsRead >= 64
}
func (b *bitReaderShifted) remaining() uint {
return b.off*8 + uint(64-b.bitsRead)
}
// close the bitstream and returns an error if out-of-buffer reads occurred.
func (b *bitReaderShifted) close() error {
// Release reference.
b.in = nil
if b.remaining() > 0 {
return fmt.Errorf("corrupt input: %d bits remain on stream", b.remaining())
}
if b.bitsRead > 64 {
return io.ErrUnexpectedEOF
}

9
vendor/github.com/klauspost/compress/huff0/compress.go generated vendored
View File

@ -2,6 +2,7 @@ package huff0
import (
"fmt"
"math"
"runtime"
"sync"
)
@ -289,6 +290,10 @@ func (s *Scratch) compress4X(src []byte) ([]byte, error) {
if err != nil {
return nil, err
}
if len(s.Out)-idx > math.MaxUint16 {
// We cannot store the size in the jump table
return nil, ErrIncompressible
}
// Write compressed length as little endian before block.
if i < 3 {
// Last length is not written.
@ -332,6 +337,10 @@ func (s *Scratch) compress4Xp(src []byte) ([]byte, error) {
return nil, errs[i]
}
o := s.tmpOut[i]
if len(o) > math.MaxUint16 {
// We cannot store the size in the jump table
return nil, ErrIncompressible
}
// Write compressed length as little endian before block.
if i < 3 {
// Last length is not written.

384
vendor/github.com/klauspost/compress/huff0/decompress.go generated vendored
View File

@ -4,6 +4,7 @@ import (
"errors"
"fmt"
"io"
"sync"
"github.com/klauspost/compress/fse"
)
@ -216,6 +217,7 @@ func (s *Scratch) Decoder() *Decoder {
return &Decoder{
dt: s.dt,
actualTableLog: s.actualTableLog,
bufs: &s.decPool,
}
}
@ -223,6 +225,15 @@ func (s *Scratch) Decoder() *Decoder {
type Decoder struct {
dt dTable
actualTableLog uint8
bufs *sync.Pool
}
func (d *Decoder) buffer() *[4][256]byte {
buf, ok := d.bufs.Get().(*[4][256]byte)
if ok {
return buf
}
return &[4][256]byte{}
}
// Decompress1X will decompress a 1X encoded stream.
@ -249,7 +260,8 @@ func (d *Decoder) Decompress1X(dst, src []byte) ([]byte, error) {
dt := d.dt.single[:tlSize]
// Use temp table to avoid bound checks/append penalty.
var buf [256]byte
bufs := d.buffer()
buf := &bufs[0]
var off uint8
for br.off >= 8 {
@ -277,6 +289,7 @@ func (d *Decoder) Decompress1X(dst, src []byte) ([]byte, error) {
if off == 0 {
if len(dst)+256 > maxDecodedSize {
br.close()
d.bufs.Put(bufs)
return nil, ErrMaxDecodedSizeExceeded
}
dst = append(dst, buf[:]...)
@ -284,6 +297,7 @@ func (d *Decoder) Decompress1X(dst, src []byte) ([]byte, error) {
}
if len(dst)+int(off) > maxDecodedSize {
d.bufs.Put(bufs)
br.close()
return nil, ErrMaxDecodedSizeExceeded
}
@ -310,6 +324,7 @@ func (d *Decoder) Decompress1X(dst, src []byte) ([]byte, error) {
}
}
if len(dst) >= maxDecodedSize {
d.bufs.Put(bufs)
br.close()
return nil, ErrMaxDecodedSizeExceeded
}
@ -319,6 +334,7 @@ func (d *Decoder) Decompress1X(dst, src []byte) ([]byte, error) {
bitsLeft -= nBits
dst = append(dst, uint8(v.entry>>8))
}
d.bufs.Put(bufs)
return dst, br.close()
}
@ -341,7 +357,8 @@ func (d *Decoder) decompress1X8Bit(dst, src []byte) ([]byte, error) {
dt := d.dt.single[:256]
// Use temp table to avoid bound checks/append penalty.
var buf [256]byte
bufs := d.buffer()
buf := &bufs[0]
var off uint8
switch d.actualTableLog {
@ -369,6 +386,7 @@ func (d *Decoder) decompress1X8Bit(dst, src []byte) ([]byte, error) {
if off == 0 {
if len(dst)+256 > maxDecodedSize {
br.close()
d.bufs.Put(bufs)
return nil, ErrMaxDecodedSizeExceeded
}
dst = append(dst, buf[:]...)
@ -398,6 +416,7 @@ func (d *Decoder) decompress1X8Bit(dst, src []byte) ([]byte, error) {
if off == 0 {
if len(dst)+256 > maxDecodedSize {
br.close()
d.bufs.Put(bufs)
return nil, ErrMaxDecodedSizeExceeded
}
dst = append(dst, buf[:]...)
@ -426,6 +445,7 @@ func (d *Decoder) decompress1X8Bit(dst, src []byte) ([]byte, error) {
off += 4
if off == 0 {
if len(dst)+256 > maxDecodedSize {
d.bufs.Put(bufs)
br.close()
return nil, ErrMaxDecodedSizeExceeded
}
@ -455,6 +475,7 @@ func (d *Decoder) decompress1X8Bit(dst, src []byte) ([]byte, error) {
off += 4
if off == 0 {
if len(dst)+256 > maxDecodedSize {
d.bufs.Put(bufs)
br.close()
return nil, ErrMaxDecodedSizeExceeded
}
@ -484,6 +505,7 @@ func (d *Decoder) decompress1X8Bit(dst, src []byte) ([]byte, error) {
off += 4
if off == 0 {
if len(dst)+256 > maxDecodedSize {
d.bufs.Put(bufs)
br.close()
return nil, ErrMaxDecodedSizeExceeded
}
@ -513,6 +535,7 @@ func (d *Decoder) decompress1X8Bit(dst, src []byte) ([]byte, error) {
off += 4
if off == 0 {
if len(dst)+256 > maxDecodedSize {
d.bufs.Put(bufs)
br.close()
return nil, ErrMaxDecodedSizeExceeded
}
@ -542,6 +565,7 @@ func (d *Decoder) decompress1X8Bit(dst, src []byte) ([]byte, error) {
off += 4
if off == 0 {
if len(dst)+256 > maxDecodedSize {
d.bufs.Put(bufs)
br.close()
return nil, ErrMaxDecodedSizeExceeded
}
@ -571,6 +595,7 @@ func (d *Decoder) decompress1X8Bit(dst, src []byte) ([]byte, error) {
off += 4
if off == 0 {
if len(dst)+256 > maxDecodedSize {
d.bufs.Put(bufs)
br.close()
return nil, ErrMaxDecodedSizeExceeded
}
@ -578,10 +603,12 @@ func (d *Decoder) decompress1X8Bit(dst, src []byte) ([]byte, error) {
}
}
default:
d.bufs.Put(bufs)
return nil, fmt.Errorf("invalid tablelog: %d", d.actualTableLog)
}
if len(dst)+int(off) > maxDecodedSize {
d.bufs.Put(bufs)
br.close()
return nil, ErrMaxDecodedSizeExceeded
}
@ -601,6 +628,7 @@ func (d *Decoder) decompress1X8Bit(dst, src []byte) ([]byte, error) {
}
if len(dst) >= maxDecodedSize {
br.close()
d.bufs.Put(bufs)
return nil, ErrMaxDecodedSizeExceeded
}
v := dt[br.peekByteFast()>>shift]
@ -609,6 +637,7 @@ func (d *Decoder) decompress1X8Bit(dst, src []byte) ([]byte, error) {
bitsLeft -= int8(nBits)
dst = append(dst, uint8(v.entry>>8))
}
d.bufs.Put(bufs)
return dst, br.close()
}
@ -628,7 +657,8 @@ func (d *Decoder) decompress1X8BitExactly(dst, src []byte) ([]byte, error) {
dt := d.dt.single[:256]
// Use temp table to avoid bound checks/append penalty.
var buf [256]byte
bufs := d.buffer()
buf := &bufs[0]
var off uint8
const shift = 56
@ -655,6 +685,7 @@ func (d *Decoder) decompress1X8BitExactly(dst, src []byte) ([]byte, error) {
off += 4
if off == 0 {
if len(dst)+256 > maxDecodedSize {
d.bufs.Put(bufs)
br.close()
return nil, ErrMaxDecodedSizeExceeded
}
@ -663,6 +694,7 @@ func (d *Decoder) decompress1X8BitExactly(dst, src []byte) ([]byte, error) {
}
if len(dst)+int(off) > maxDecodedSize {
d.bufs.Put(bufs)
br.close()
return nil, ErrMaxDecodedSizeExceeded
}
@ -679,6 +711,7 @@ func (d *Decoder) decompress1X8BitExactly(dst, src []byte) ([]byte, error) {
}
}
if len(dst) >= maxDecodedSize {
d.bufs.Put(bufs)
br.close()
return nil, ErrMaxDecodedSizeExceeded
}
@ -688,6 +721,7 @@ func (d *Decoder) decompress1X8BitExactly(dst, src []byte) ([]byte, error) {
bitsLeft -= int8(nBits)
dst = append(dst, uint8(v.entry>>8))
}
d.bufs.Put(bufs)
return dst, br.close()
}
@ -707,6 +741,7 @@ func (d *Decoder) Decompress4X(dst, src []byte) ([]byte, error) {
}
var br [4]bitReaderShifted
// Decode "jump table"
start := 6
for i := 0; i < 3; i++ {
length := int(src[i*2]) | (int(src[i*2+1]) << 8)
@ -735,12 +770,12 @@ func (d *Decoder) Decompress4X(dst, src []byte) ([]byte, error) {
single := d.dt.single[:tlSize]
// Use temp table to avoid bound checks/append penalty.
var buf [256]byte
buf := d.buffer()
var off uint8
var decoded int
// Decode 2 values from each decoder/loop.
const bufoff = 256 / 4
const bufoff = 256
for {
if br[0].off < 4 || br[1].off < 4 || br[2].off < 4 || br[3].off < 4 {
break
@ -758,8 +793,8 @@ func (d *Decoder) Decompress4X(dst, src []byte) ([]byte, error) {
v2 := single[val2&tlMask]
br[stream].advance(uint8(v.entry))
br[stream2].advance(uint8(v2.entry))
buf[off+bufoff*stream] = uint8(v.entry >> 8)
buf[off+bufoff*stream2] = uint8(v2.entry >> 8)
buf[stream][off] = uint8(v.entry >> 8)
buf[stream2][off] = uint8(v2.entry >> 8)
val = br[stream].peekBitsFast(d.actualTableLog)
val2 = br[stream2].peekBitsFast(d.actualTableLog)
@ -767,8 +802,8 @@ func (d *Decoder) Decompress4X(dst, src []byte) ([]byte, error) {
v2 = single[val2&tlMask]
br[stream].advance(uint8(v.entry))
br[stream2].advance(uint8(v2.entry))
buf[off+bufoff*stream+1] = uint8(v.entry >> 8)
buf[off+bufoff*stream2+1] = uint8(v2.entry >> 8)
buf[stream][off+1] = uint8(v.entry >> 8)
buf[stream2][off+1] = uint8(v2.entry >> 8)
}
{
@ -783,8 +818,8 @@ func (d *Decoder) Decompress4X(dst, src []byte) ([]byte, error) {
v2 := single[val2&tlMask]
br[stream].advance(uint8(v.entry))
br[stream2].advance(uint8(v2.entry))
buf[off+bufoff*stream] = uint8(v.entry >> 8)
buf[off+bufoff*stream2] = uint8(v2.entry >> 8)
buf[stream][off] = uint8(v.entry >> 8)
buf[stream2][off] = uint8(v2.entry >> 8)
val = br[stream].peekBitsFast(d.actualTableLog)
val2 = br[stream2].peekBitsFast(d.actualTableLog)
@ -792,25 +827,26 @@ func (d *Decoder) Decompress4X(dst, src []byte) ([]byte, error) {
v2 = single[val2&tlMask]
br[stream].advance(uint8(v.entry))
br[stream2].advance(uint8(v2.entry))
buf[off+bufoff*stream+1] = uint8(v.entry >> 8)
buf[off+bufoff*stream2+1] = uint8(v2.entry >> 8)
buf[stream][off+1] = uint8(v.entry >> 8)
buf[stream2][off+1] = uint8(v2.entry >> 8)
}
off += 2
if off == bufoff {
if off == 0 {
if bufoff > dstEvery {
d.bufs.Put(buf)
return nil, errors.New("corruption detected: stream overrun 1")
}
copy(out, buf[:bufoff])
copy(out[dstEvery:], buf[bufoff:bufoff*2])
copy(out[dstEvery*2:], buf[bufoff*2:bufoff*3])
copy(out[dstEvery*3:], buf[bufoff*3:bufoff*4])
off = 0
copy(out, buf[0][:])
copy(out[dstEvery:], buf[1][:])
copy(out[dstEvery*2:], buf[2][:])
copy(out[dstEvery*3:], buf[3][:])
out = out[bufoff:]
decoded += 256
decoded += bufoff * 4
// There must at least be 3 buffers left.
if len(out) < dstEvery*3 {
d.bufs.Put(buf)
return nil, errors.New("corruption detected: stream overrun 2")
}
}
@ -818,41 +854,31 @@ func (d *Decoder) Decompress4X(dst, src []byte) ([]byte, error) {
if off > 0 {
ioff := int(off)
if len(out) < dstEvery*3+ioff {
d.bufs.Put(buf)
return nil, errors.New("corruption detected: stream overrun 3")
}
copy(out, buf[:off])
copy(out[dstEvery:dstEvery+ioff], buf[bufoff:bufoff*2])
copy(out[dstEvery*2:dstEvery*2+ioff], buf[bufoff*2:bufoff*3])
copy(out[dstEvery*3:dstEvery*3+ioff], buf[bufoff*3:bufoff*4])
copy(out, buf[0][:off])
copy(out[dstEvery:], buf[1][:off])
copy(out[dstEvery*2:], buf[2][:off])
copy(out[dstEvery*3:], buf[3][:off])
decoded += int(off) * 4
out = out[off:]
}
// Decode remaining.
remainBytes := dstEvery - (decoded / 4)
for i := range br {
offset := dstEvery * i
endsAt := offset + remainBytes
if endsAt > len(out) {
endsAt = len(out)
}
br := &br[i]
bitsLeft := br.off*8 + uint(64-br.bitsRead)
bitsLeft := br.remaining()
for bitsLeft > 0 {
br.fill()
if false && br.bitsRead >= 32 {
if br.off >= 4 {
v := br.in[br.off-4:]
v = v[:4]
low := (uint32(v[0])) | (uint32(v[1]) << 8) | (uint32(v[2]) << 16) | (uint32(v[3]) << 24)
br.value = (br.value << 32) | uint64(low)
br.bitsRead -= 32
br.off -= 4
} else {
for br.off > 0 {
br.value = (br.value << 8) | uint64(br.in[br.off-1])
br.bitsRead -= 8
br.off--
}
}
}
// end inline...
if offset >= len(out) {
if offset >= endsAt {
d.bufs.Put(buf)
return nil, errors.New("corruption detected: stream overrun 4")
}
@ -865,12 +891,17 @@ func (d *Decoder) Decompress4X(dst, src []byte) ([]byte, error) {
out[offset] = uint8(v >> 8)
offset++
}
if offset != endsAt {
d.bufs.Put(buf)
return nil, fmt.Errorf("corruption detected: short output block %d, end %d != %d", i, offset, endsAt)
}
decoded += offset - dstEvery*i
err = br.close()
if err != nil {
return nil, err
}
}
d.bufs.Put(buf)
if dstSize != decoded {
return nil, errors.New("corruption detected: short output block")
}
@ -916,12 +947,12 @@ func (d *Decoder) decompress4X8bit(dst, src []byte) ([]byte, error) {
single := d.dt.single[:tlSize]
// Use temp table to avoid bound checks/append penalty.
var buf [256]byte
buf := d.buffer()
var off uint8
var decoded int
// Decode 4 values from each decoder/loop.
const bufoff = 256 / 4
const bufoff = 256
for {
if br[0].off < 4 || br[1].off < 4 || br[2].off < 4 || br[3].off < 4 {
break
@ -942,8 +973,8 @@ func (d *Decoder) decompress4X8bit(dst, src []byte) ([]byte, error) {
br1.value <<= v & 63
br2.bitsRead += uint8(v2)
br2.value <<= v2 & 63
buf[off+bufoff*stream] = uint8(v >> 8)
buf[off+bufoff*stream2] = uint8(v2 >> 8)
buf[stream][off] = uint8(v >> 8)
buf[stream2][off] = uint8(v2 >> 8)
v = single[uint8(br1.value>>shift)].entry
v2 = single[uint8(br2.value>>shift)].entry
@ -951,8 +982,8 @@ func (d *Decoder) decompress4X8bit(dst, src []byte) ([]byte, error) {
br1.value <<= v & 63
br2.bitsRead += uint8(v2)
br2.value <<= v2 & 63
buf[off+bufoff*stream+1] = uint8(v >> 8)
buf[off+bufoff*stream2+1] = uint8(v2 >> 8)
buf[stream][off+1] = uint8(v >> 8)
buf[stream2][off+1] = uint8(v2 >> 8)
v = single[uint8(br1.value>>shift)].entry
v2 = single[uint8(br2.value>>shift)].entry
@ -960,8 +991,8 @@ func (d *Decoder) decompress4X8bit(dst, src []byte) ([]byte, error) {
br1.value <<= v & 63
br2.bitsRead += uint8(v2)
br2.value <<= v2 & 63
buf[off+bufoff*stream+2] = uint8(v >> 8)
buf[off+bufoff*stream2+2] = uint8(v2 >> 8)
buf[stream][off+2] = uint8(v >> 8)
buf[stream2][off+2] = uint8(v2 >> 8)
v = single[uint8(br1.value>>shift)].entry
v2 = single[uint8(br2.value>>shift)].entry
@ -969,8 +1000,8 @@ func (d *Decoder) decompress4X8bit(dst, src []byte) ([]byte, error) {
br1.value <<= v & 63
br2.bitsRead += uint8(v2)
br2.value <<= v2 & 63
buf[off+bufoff*stream2+3] = uint8(v2 >> 8)
buf[off+bufoff*stream+3] = uint8(v >> 8)
buf[stream][off+3] = uint8(v >> 8)
buf[stream2][off+3] = uint8(v2 >> 8)
}
{
@ -987,8 +1018,8 @@ func (d *Decoder) decompress4X8bit(dst, src []byte) ([]byte, error) {
br1.value <<= v & 63
br2.bitsRead += uint8(v2)
br2.value <<= v2 & 63
buf[off+bufoff*stream] = uint8(v >> 8)
buf[off+bufoff*stream2] = uint8(v2 >> 8)
buf[stream][off] = uint8(v >> 8)
buf[stream2][off] = uint8(v2 >> 8)
v = single[uint8(br1.value>>shift)].entry
v2 = single[uint8(br2.value>>shift)].entry
@ -996,8 +1027,8 @@ func (d *Decoder) decompress4X8bit(dst, src []byte) ([]byte, error) {
br1.value <<= v & 63
br2.bitsRead += uint8(v2)
br2.value <<= v2 & 63
buf[off+bufoff*stream+1] = uint8(v >> 8)
buf[off+bufoff*stream2+1] = uint8(v2 >> 8)
buf[stream][off+1] = uint8(v >> 8)
buf[stream2][off+1] = uint8(v2 >> 8)
v = single[uint8(br1.value>>shift)].entry
v2 = single[uint8(br2.value>>shift)].entry
@ -1005,8 +1036,8 @@ func (d *Decoder) decompress4X8bit(dst, src []byte) ([]byte, error) {
br1.value <<= v & 63
br2.bitsRead += uint8(v2)
br2.value <<= v2 & 63
buf[off+bufoff*stream+2] = uint8(v >> 8)
buf[off+bufoff*stream2+2] = uint8(v2 >> 8)
buf[stream][off+2] = uint8(v >> 8)
buf[stream2][off+2] = uint8(v2 >> 8)
v = single[uint8(br1.value>>shift)].entry
v2 = single[uint8(br2.value>>shift)].entry
@ -1014,25 +1045,26 @@ func (d *Decoder) decompress4X8bit(dst, src []byte) ([]byte, error) {
br1.value <<= v & 63
br2.bitsRead += uint8(v2)
br2.value <<= v2 & 63
buf[off+bufoff*stream2+3] = uint8(v2 >> 8)
buf[off+bufoff*stream+3] = uint8(v >> 8)
buf[stream][off+3] = uint8(v >> 8)
buf[stream2][off+3] = uint8(v2 >> 8)
}
off += 4
if off == bufoff {
if off == 0 {
if bufoff > dstEvery {
d.bufs.Put(buf)
return nil, errors.New("corruption detected: stream overrun 1")
}
copy(out, buf[:bufoff])
copy(out[dstEvery:], buf[bufoff:bufoff*2])
copy(out[dstEvery*2:], buf[bufoff*2:bufoff*3])
copy(out[dstEvery*3:], buf[bufoff*3:bufoff*4])
off = 0
copy(out, buf[0][:])
copy(out[dstEvery:], buf[1][:])
copy(out[dstEvery*2:], buf[2][:])
copy(out[dstEvery*3:], buf[3][:])
out = out[bufoff:]
decoded += 256
decoded += bufoff * 4
// There must at least be 3 buffers left.
if len(out) < dstEvery*3 {
d.bufs.Put(buf)
return nil, errors.New("corruption detected: stream overrun 2")
}
}
@ -1040,23 +1072,31 @@ func (d *Decoder) decompress4X8bit(dst, src []byte) ([]byte, error) {
if off > 0 {
ioff := int(off)
if len(out) < dstEvery*3+ioff {
d.bufs.Put(buf)
return nil, errors.New("corruption detected: stream overrun 3")
}
copy(out, buf[:off])
copy(out[dstEvery:dstEvery+ioff], buf[bufoff:bufoff*2])
copy(out[dstEvery*2:dstEvery*2+ioff], buf[bufoff*2:bufoff*3])
copy(out[dstEvery*3:dstEvery*3+ioff], buf[bufoff*3:bufoff*4])
copy(out, buf[0][:off])
copy(out[dstEvery:], buf[1][:off])
copy(out[dstEvery*2:], buf[2][:off])
copy(out[dstEvery*3:], buf[3][:off])
decoded += int(off) * 4
out = out[off:]
}
// Decode remaining.
// Decode remaining.
remainBytes := dstEvery - (decoded / 4)
for i := range br {
offset := dstEvery * i
endsAt := offset + remainBytes
if endsAt > len(out) {
endsAt = len(out)
}
br := &br[i]
bitsLeft := int(br.off*8) + int(64-br.bitsRead)
bitsLeft := br.remaining()
for bitsLeft > 0 {
if br.finished() {
d.bufs.Put(buf)
return nil, io.ErrUnexpectedEOF
}
if br.bitsRead >= 56 {
@ -1076,7 +1116,8 @@ func (d *Decoder) decompress4X8bit(dst, src []byte) ([]byte, error) {
}
}
// end inline...
if offset >= len(out) {
if offset >= endsAt {
d.bufs.Put(buf)
return nil, errors.New("corruption detected: stream overrun 4")
}
@ -1084,16 +1125,22 @@ func (d *Decoder) decompress4X8bit(dst, src []byte) ([]byte, error) {
v := single[uint8(br.value>>shift)].entry
nBits := uint8(v)
br.advance(nBits)
bitsLeft -= int(nBits)
bitsLeft -= uint(nBits)
out[offset] = uint8(v >> 8)
offset++
}
if offset != endsAt {
d.bufs.Put(buf)
return nil, fmt.Errorf("corruption detected: short output block %d, end %d != %d", i, offset, endsAt)
}
decoded += offset - dstEvery*i
err = br.close()
if err != nil {
d.bufs.Put(buf)
return nil, err
}
}
d.bufs.Put(buf)
if dstSize != decoded {
return nil, errors.New("corruption detected: short output block")
}
@ -1135,12 +1182,12 @@ func (d *Decoder) decompress4X8bitExactly(dst, src []byte) ([]byte, error) {
single := d.dt.single[:tlSize]
// Use temp table to avoid bound checks/append penalty.
var buf [256]byte
buf := d.buffer()
var off uint8
var decoded int
// Decode 4 values from each decoder/loop.
const bufoff = 256 / 4
const bufoff = 256
for {
if br[0].off < 4 || br[1].off < 4 || br[2].off < 4 || br[3].off < 4 {
break
@ -1150,104 +1197,109 @@ func (d *Decoder) decompress4X8bitExactly(dst, src []byte) ([]byte, error) {
// Interleave 2 decodes.
const stream = 0
const stream2 = 1
br[stream].fillFast()
br[stream2].fillFast()
br1 := &br[stream]
br2 := &br[stream2]
br1.fillFast()
br2.fillFast()
v := single[uint8(br[stream].value>>shift)].entry
v2 := single[uint8(br[stream2].value>>shift)].entry
br[stream].bitsRead += uint8(v)
br[stream].value <<= v & 63
br[stream2].bitsRead += uint8(v2)
br[stream2].value <<= v2 & 63
buf[off+bufoff*stream] = uint8(v >> 8)
buf[off+bufoff*stream2] = uint8(v2 >> 8)
v := single[uint8(br1.value>>shift)].entry
v2 := single[uint8(br2.value>>shift)].entry
br1.bitsRead += uint8(v)
br1.value <<= v & 63
br2.bitsRead += uint8(v2)
br2.value <<= v2 & 63
buf[stream][off] = uint8(v >> 8)
buf[stream2][off] = uint8(v2 >> 8)
v = single[uint8(br[stream].value>>shift)].entry
v2 = single[uint8(br[stream2].value>>shift)].entry
br[stream].bitsRead += uint8(v)
br[stream].value <<= v & 63
br[stream2].bitsRead += uint8(v2)
br[stream2].value <<= v2 & 63
buf[off+bufoff*stream+1] = uint8(v >> 8)
buf[off+bufoff*stream2+1] = uint8(v2 >> 8)
v = single[uint8(br1.value>>shift)].entry
v2 = single[uint8(br2.value>>shift)].entry
br1.bitsRead += uint8(v)
br1.value <<= v & 63
br2.bitsRead += uint8(v2)
br2.value <<= v2 & 63
buf[stream][off+1] = uint8(v >> 8)
buf[stream2][off+1] = uint8(v2 >> 8)
v = single[uint8(br[stream].value>>shift)].entry
v2 = single[uint8(br[stream2].value>>shift)].entry
br[stream].bitsRead += uint8(v)
br[stream].value <<= v & 63
br[stream2].bitsRead += uint8(v2)
br[stream2].value <<= v2 & 63
buf[off+bufoff*stream+2] = uint8(v >> 8)
buf[off+bufoff*stream2+2] = uint8(v2 >> 8)
v = single[uint8(br1.value>>shift)].entry
v2 = single[uint8(br2.value>>shift)].entry
br1.bitsRead += uint8(v)
br1.value <<= v & 63
br2.bitsRead += uint8(v2)
br2.value <<= v2 & 63
buf[stream][off+2] = uint8(v >> 8)
buf[stream2][off+2] = uint8(v2 >> 8)
v = single[uint8(br[stream].value>>shift)].entry
v2 = single[uint8(br[stream2].value>>shift)].entry
br[stream].bitsRead += uint8(v)
br[stream].value <<= v & 63
br[stream2].bitsRead += uint8(v2)
br[stream2].value <<= v2 & 63
buf[off+bufoff*stream+3] = uint8(v >> 8)
buf[off+bufoff*stream2+3] = uint8(v2 >> 8)
v = single[uint8(br1.value>>shift)].entry
v2 = single[uint8(br2.value>>shift)].entry
br1.bitsRead += uint8(v)
br1.value <<= v & 63
br2.bitsRead += uint8(v2)
br2.value <<= v2 & 63
buf[stream][off+3] = uint8(v >> 8)
buf[stream2][off+3] = uint8(v2 >> 8)
}
{
const stream = 2
const stream2 = 3
br[stream].fillFast()
br[stream2].fillFast()
br1 := &br[stream]
br2 := &br[stream2]
br1.fillFast()
br2.fillFast()
v := single[uint8(br[stream].value>>shift)].entry
v2 := single[uint8(br[stream2].value>>shift)].entry
br[stream].bitsRead += uint8(v)
br[stream].value <<= v & 63
br[stream2].bitsRead += uint8(v2)
br[stream2].value <<= v2 & 63
buf[off+bufoff*stream] = uint8(v >> 8)
buf[off+bufoff*stream2] = uint8(v2 >> 8)
v := single[uint8(br1.value>>shift)].entry
v2 := single[uint8(br2.value>>shift)].entry
br1.bitsRead += uint8(v)
br1.value <<= v & 63
br2.bitsRead += uint8(v2)
br2.value <<= v2 & 63
buf[stream][off] = uint8(v >> 8)
buf[stream2][off] = uint8(v2 >> 8)
v = single[uint8(br[stream].value>>shift)].entry
v2 = single[uint8(br[stream2].value>>shift)].entry
br[stream].bitsRead += uint8(v)
br[stream].value <<= v & 63
br[stream2].bitsRead += uint8(v2)
br[stream2].value <<= v2 & 63
buf[off+bufoff*stream+1] = uint8(v >> 8)
buf[off+bufoff*stream2+1] = uint8(v2 >> 8)
v = single[uint8(br1.value>>shift)].entry
v2 = single[uint8(br2.value>>shift)].entry
br1.bitsRead += uint8(v)
br1.value <<= v & 63
br2.bitsRead += uint8(v2)
br2.value <<= v2 & 63
buf[stream][off+1] = uint8(v >> 8)
buf[stream2][off+1] = uint8(v2 >> 8)
v = single[uint8(br[stream].value>>shift)].entry
v2 = single[uint8(br[stream2].value>>shift)].entry
br[stream].bitsRead += uint8(v)
br[stream].value <<= v & 63
br[stream2].bitsRead += uint8(v2)
br[stream2].value <<= v2 & 63
buf[off+bufoff*stream+2] = uint8(v >> 8)
buf[off+bufoff*stream2+2] = uint8(v2 >> 8)
v = single[uint8(br1.value>>shift)].entry
v2 = single[uint8(br2.value>>shift)].entry
br1.bitsRead += uint8(v)
br1.value <<= v & 63
br2.bitsRead += uint8(v2)
br2.value <<= v2 & 63
buf[stream][off+2] = uint8(v >> 8)
buf[stream2][off+2] = uint8(v2 >> 8)
v = single[uint8(br[stream].value>>shift)].entry
v2 = single[uint8(br[stream2].value>>shift)].entry
br[stream].bitsRead += uint8(v)
br[stream].value <<= v & 63
br[stream2].bitsRead += uint8(v2)
br[stream2].value <<= v2 & 63
buf[off+bufoff*stream+3] = uint8(v >> 8)
buf[off+bufoff*stream2+3] = uint8(v2 >> 8)
v = single[uint8(br1.value>>shift)].entry
v2 = single[uint8(br2.value>>shift)].entry
br1.bitsRead += uint8(v)
br1.value <<= v & 63
br2.bitsRead += uint8(v2)
br2.value <<= v2 & 63
buf[stream][off+3] = uint8(v >> 8)
buf[stream2][off+3] = uint8(v2 >> 8)
}
off += 4
if off == bufoff {
if off == 0 {
if bufoff > dstEvery {
d.bufs.Put(buf)
return nil, errors.New("corruption detected: stream overrun 1")
}
copy(out, buf[:bufoff])
copy(out[dstEvery:], buf[bufoff:bufoff*2])
copy(out[dstEvery*2:], buf[bufoff*2:bufoff*3])
copy(out[dstEvery*3:], buf[bufoff*3:bufoff*4])
off = 0
copy(out, buf[0][:])
copy(out[dstEvery:], buf[1][:])
copy(out[dstEvery*2:], buf[2][:])
copy(out[dstEvery*3:], buf[3][:])
out = out[bufoff:]
decoded += 256
decoded += bufoff * 4
// There must at least be 3 buffers left.
if len(out) < dstEvery*3 {
d.bufs.Put(buf)
return nil, errors.New("corruption detected: stream overrun 2")
}
}
@ -1257,21 +1309,27 @@ func (d *Decoder) decompress4X8bitExactly(dst, src []byte) ([]byte, error) {
if len(out) < dstEvery*3+ioff {
return nil, errors.New("corruption detected: stream overrun 3")
}
copy(out, buf[:off])
copy(out[dstEvery:dstEvery+ioff], buf[bufoff:bufoff*2])
copy(out[dstEvery*2:dstEvery*2+ioff], buf[bufoff*2:bufoff*3])
copy(out[dstEvery*3:dstEvery*3+ioff], buf[bufoff*3:bufoff*4])
copy(out, buf[0][:off])
copy(out[dstEvery:], buf[1][:off])
copy(out[dstEvery*2:], buf[2][:off])
copy(out[dstEvery*3:], buf[3][:off])
decoded += int(off) * 4
out = out[off:]
}
// Decode remaining.
remainBytes := dstEvery - (decoded / 4)
for i := range br {
offset := dstEvery * i
endsAt := offset + remainBytes
if endsAt > len(out) {
endsAt = len(out)
}
br := &br[i]
bitsLeft := int(br.off*8) + int(64-br.bitsRead)
bitsLeft := br.remaining()
for bitsLeft > 0 {
if br.finished() {
d.bufs.Put(buf)
return nil, io.ErrUnexpectedEOF
}
if br.bitsRead >= 56 {
@ -1291,7 +1349,8 @@ func (d *Decoder) decompress4X8bitExactly(dst, src []byte) ([]byte, error) {
}
}
// end inline...
if offset >= len(out) {
if offset >= endsAt {
d.bufs.Put(buf)
return nil, errors.New("corruption detected: stream overrun 4")
}
@ -1299,16 +1358,23 @@ func (d *Decoder) decompress4X8bitExactly(dst, src []byte) ([]byte, error) {
v := single[br.peekByteFast()].entry
nBits := uint8(v)
br.advance(nBits)
bitsLeft -= int(nBits)
bitsLeft -= uint(nBits)
out[offset] = uint8(v >> 8)
offset++
}
if offset != endsAt {
d.bufs.Put(buf)
return nil, fmt.Errorf("corruption detected: short output block %d, end %d != %d", i, offset, endsAt)
}
decoded += offset - dstEvery*i
err = br.close()
if err != nil {
d.bufs.Put(buf)
return nil, err
}
}
d.bufs.Put(buf)
if dstSize != decoded {
return nil, errors.New("corruption detected: short output block")
}

2
vendor/github.com/klauspost/compress/huff0/huff0.go generated vendored
View File

@ -8,6 +8,7 @@ import (
"fmt"
"math"
"math/bits"
"sync"
"github.com/klauspost/compress/fse"
)
@ -116,6 +117,7 @@ type Scratch struct {
nodes []nodeElt
tmpOut [4][]byte
fse *fse.Scratch
decPool sync.Pool // *[4][256]byte buffers.
huffWeight [maxSymbolValue + 1]byte
}

34
vendor/github.com/klauspost/compress/zstd/README.md generated vendored
View File

@ -78,6 +78,9 @@ of a stream. This is independent of the `WithEncoderConcurrency(n)`, but that is
in the future. So if you want to limit concurrency for future updates, specify the concurrency
you would like.
If you would like stream encoding to be done without spawning async goroutines, use `WithEncoderConcurrency(1)`
which will compress input as each block is completed, blocking on writes until each has completed.
You can specify your desired compression level using `WithEncoderLevel()` option. Currently only pre-defined
compression settings can be specified.
@ -104,7 +107,8 @@ and seems to ignore concatenated streams, even though [it is part of the spec](h
For compressing small blocks, the returned encoder has a function called `EncodeAll(src, dst []byte) []byte`.
`EncodeAll` will encode all input in src and append it to dst.
This function can be called concurrently, but each call will only run on a single goroutine.
This function can be called concurrently.
Each call will only run on a same goroutine as the caller.
Encoded blocks can be concatenated and the result will be the combined input stream.
Data compressed with EncodeAll can be decoded with the Decoder, using either a stream or `DecodeAll`.
@ -283,8 +287,13 @@ func Decompress(in io.Reader, out io.Writer) error {
}
```
It is important to use the "Close" function when you no longer need the Reader to stop running goroutines.
See "Allocation-less operation" below.
It is important to use the "Close" function when you no longer need the Reader to stop running goroutines,
when running with default settings.
Goroutines will exit once an error has been returned, including `io.EOF` at the end of a stream.
Streams are decoded concurrently in 4 asynchronous stages to give the best possible throughput.
However, if you prefer synchronous decompression, use `WithDecoderConcurrency(1)` which will decompress data
as it is being requested only.
For decoding buffers, it could look something like this:
@ -293,7 +302,7 @@ import "github.com/klauspost/compress/zstd"
// Create a reader that caches decompressors.
// For this operation type we supply a nil Reader.
var decoder, _ = zstd.NewReader(nil)
var decoder, _ = zstd.NewReader(nil, WithDecoderConcurrency(0))
// Decompress a buffer. We don't supply a destination buffer,
// so it will be allocated by the decoder.
@ -304,8 +313,11 @@ func Decompress(src []byte) ([]byte, error) {
Both of these cases should provide the functionality needed.
The decoder can be used for *concurrent* decompression of multiple buffers.
By default 4 decompressors will be created.
It will only allow a certain number of concurrent operations to run.
To tweak that yourself use the `WithDecoderConcurrency(n)` option when creating the decoder.
It is possible to use `WithDecoderConcurrency(0)` to create GOMAXPROCS decoders.
### Dictionaries
@ -357,18 +369,20 @@ In this case no unneeded allocations should be made.
The buffer decoder does everything on the same goroutine and does nothing concurrently.
It can however decode several buffers concurrently. Use `WithDecoderConcurrency(n)` to limit that.
The stream decoder operates on
The stream decoder will create goroutines that:
* One goroutine reads input and splits the input to several block decoders.
* A number of decoders will decode blocks.
* A goroutine coordinates these blocks and sends history from one to the next.
1) Reads input and splits the input into blocks.
2) Decompression of literals.
3) Decompression of sequences.
4) Reconstruction of output stream.
So effectively this also means the decoder will "read ahead" and prepare data to always be available for output.
The concurrency level will, for streams, determine how many blocks ahead the compression will start.
Since "blocks" are quite dependent on the output of the previous block stream decoding will only have limited concurrency.
In practice this means that concurrency is often limited to utilizing about 2 cores effectively.
In practice this means that concurrency is often limited to utilizing about 3 cores effectively.
### Benchmarks

4
vendor/github.com/klauspost/compress/zstd/bitreader.go generated vendored
View File

@ -7,6 +7,7 @@ package zstd
import (
"encoding/binary"
"errors"
"fmt"
"io"
"math/bits"
)
@ -132,6 +133,9 @@ func (b *bitReader) remain() uint {
func (b *bitReader) close() error {
// Release reference.
b.in = nil
if !b.finished() {
return fmt.Errorf("%d extra bits on block, should be 0", b.remain())
}
if b.bitsRead > 64 {
return io.ErrUnexpectedEOF
}

430
vendor/github.com/klauspost/compress/zstd/blockdec.go generated vendored
View File

@ -76,16 +76,25 @@ type blockDec struct {
// Window size of the block.
WindowSize uint64
history chan *history
input chan struct{}
result chan decodeOutput
err error
decWG sync.WaitGroup
err error
// Check against this crc
checkCRC []byte
// Frame to use for singlethreaded decoding.
// Should not be used by the decoder itself since parent may be another frame.
localFrame *frameDec
sequence []seqVals
async struct {
newHist *history
literals []byte
seqData []byte
seqSize int // Size of uncompressed sequences
fcs uint64
}
// Block is RLE, this is the size.
RLESize uint32
tmp [4]byte
@ -108,13 +117,8 @@ func (b *blockDec) String() string {
func newBlockDec(lowMem bool) *blockDec {
b := blockDec{
lowMem: lowMem,
result: make(chan decodeOutput, 1),
input: make(chan struct{}, 1),
history: make(chan *history, 1),
lowMem: lowMem,
}
b.decWG.Add(1)
go b.startDecoder()
return &b
}
@ -137,6 +141,12 @@ func (b *blockDec) reset(br byteBuffer, windowSize uint64) error {
case blockTypeReserved:
return ErrReservedBlockType
case blockTypeRLE:
if cSize > maxCompressedBlockSize || cSize > int(b.WindowSize) {
if debugDecoder {
printf("rle block too big: csize:%d block: %+v\n", uint64(cSize), b)
}
return ErrWindowSizeExceeded
}
b.RLESize = uint32(cSize)
if b.lowMem {
maxSize = cSize
@ -158,6 +168,13 @@ func (b *blockDec) reset(br byteBuffer, windowSize uint64) error {
return ErrCompressedSizeTooBig
}
case blockTypeRaw:
if cSize > maxCompressedBlockSize || cSize > int(b.WindowSize) {
if debugDecoder {
printf("rle block too big: csize:%d block: %+v\n", uint64(cSize), b)
}
return ErrWindowSizeExceeded
}
b.RLESize = 0
// We do not need a destination for raw blocks.
maxSize = -1
@ -192,85 +209,14 @@ func (b *blockDec) sendErr(err error) {
b.Last = true
b.Type = blockTypeReserved
b.err = err
b.input <- struct{}{}
}
// Close will release resources.
// Closed blockDec cannot be reset.
func (b *blockDec) Close() {
close(b.input)
close(b.history)
close(b.result)
b.decWG.Wait()
}
// decodeAsync will prepare decoding the block when it receives input.
// This will separate output and history.
func (b *blockDec) startDecoder() {
defer b.decWG.Done()
for range b.input {
//println("blockDec: Got block input")
switch b.Type {
case blockTypeRLE:
if cap(b.dst) < int(b.RLESize) {
if b.lowMem {
b.dst = make([]byte, b.RLESize)
} else {
b.dst = make([]byte, maxBlockSize)
}
}
o := decodeOutput{
d: b,
b: b.dst[:b.RLESize],
err: nil,
}
v := b.data[0]
for i := range o.b {
o.b[i] = v
}
hist := <-b.history
hist.append(o.b)
b.result <- o
case blockTypeRaw:
o := decodeOutput{
d: b,
b: b.data,
err: nil,
}
hist := <-b.history
hist.append(o.b)
b.result <- o
case blockTypeCompressed:
b.dst = b.dst[:0]
err := b.decodeCompressed(nil)
o := decodeOutput{
d: b,
b: b.dst,
err: err,
}
if debugDecoder {
println("Decompressed to", len(b.dst), "bytes, error:", err)
}
b.result <- o
case blockTypeReserved:
// Used for returning errors.
<-b.history
b.result <- decodeOutput{
d: b,
b: nil,
err: b.err,
}
default:
panic("Invalid block type")
}
if debugDecoder {
println("blockDec: Finished block")
}
}
}
// decodeAsync will prepare decoding the block when it receives the history.
// If history is provided, it will not fetch it from the channel.
// decodeBuf
func (b *blockDec) decodeBuf(hist *history) error {
switch b.Type {
case blockTypeRLE:
@ -293,14 +239,23 @@ func (b *blockDec) decodeBuf(hist *history) error {
return nil
case blockTypeCompressed:
saved := b.dst
b.dst = hist.b
hist.b = nil
// Append directly to history
if hist.ignoreBuffer == 0 {
b.dst = hist.b
hist.b = nil
} else {
b.dst = b.dst[:0]
}
err := b.decodeCompressed(hist)
if debugDecoder {
println("Decompressed to total", len(b.dst), "bytes, hash:", xxhash.Sum64(b.dst), "error:", err)
}
hist.b = b.dst
b.dst = saved
if hist.ignoreBuffer == 0 {
hist.b = b.dst
b.dst = saved
} else {
hist.appendKeep(b.dst)
}
return err
case blockTypeReserved:
// Used for returning errors.
@ -310,30 +265,18 @@ func (b *blockDec) decodeBuf(hist *history) error {
}
}
// decodeCompressed will start decompressing a block.
// If no history is supplied the decoder will decodeAsync as much as possible
// before fetching from blockDec.history
func (b *blockDec) decodeCompressed(hist *history) error {
in := b.data
delayedHistory := hist == nil
if delayedHistory {
// We must always grab history.
defer func() {
if hist == nil {
<-b.history
}
}()
}
func (b *blockDec) decodeLiterals(in []byte, hist *history) (remain []byte, err error) {
// There must be at least one byte for Literals_Block_Type and one for Sequences_Section_Header
if len(in) < 2 {
return ErrBlockTooSmall
return in, ErrBlockTooSmall
}
litType := literalsBlockType(in[0] & 3)
var litRegenSize int
var litCompSize int
sizeFormat := (in[0] >> 2) & 3
var fourStreams bool
var literals []byte
switch litType {
case literalsBlockRaw, literalsBlockRLE:
switch sizeFormat {
@ -349,7 +292,7 @@ func (b *blockDec) decodeCompressed(hist *history) error {
// Regenerated_Size uses 20 bits (0-1048575). Literals_Section_Header uses 3 bytes.
if len(in) < 3 {
println("too small: litType:", litType, " sizeFormat", sizeFormat, len(in))
return ErrBlockTooSmall
return in, ErrBlockTooSmall
}
litRegenSize = int(in[0]>>4) + (int(in[1]) << 4) + (int(in[2]) << 12)
in = in[3:]
@ -360,7 +303,7 @@ func (b *blockDec) decodeCompressed(hist *history) error {
// Both Regenerated_Size and Compressed_Size use 10 bits (0-1023).
if len(in) < 3 {
println("too small: litType:", litType, " sizeFormat", sizeFormat, len(in))
return ErrBlockTooSmall
return in, ErrBlockTooSmall
}
n := uint64(in[0]>>4) + (uint64(in[1]) << 4) + (uint64(in[2]) << 12)
litRegenSize = int(n & 1023)
@ -371,7 +314,7 @@ func (b *blockDec) decodeCompressed(hist *history) error {
fourStreams = true
if len(in) < 4 {
println("too small: litType:", litType, " sizeFormat", sizeFormat, len(in))
return ErrBlockTooSmall
return in, ErrBlockTooSmall
}
n := uint64(in[0]>>4) + (uint64(in[1]) << 4) + (uint64(in[2]) << 12) + (uint64(in[3]) << 20)
litRegenSize = int(n & 16383)
@ -381,7 +324,7 @@ func (b *blockDec) decodeCompressed(hist *history) error {
fourStreams = true
if len(in) < 5 {
println("too small: litType:", litType, " sizeFormat", sizeFormat, len(in))
return ErrBlockTooSmall
return in, ErrBlockTooSmall
}
n := uint64(in[0]>>4) + (uint64(in[1]) << 4) + (uint64(in[2]) << 12) + (uint64(in[3]) << 20) + (uint64(in[4]) << 28)
litRegenSize = int(n & 262143)
@ -392,13 +335,15 @@ func (b *blockDec) decodeCompressed(hist *history) error {
if debugDecoder {
println("literals type:", litType, "litRegenSize:", litRegenSize, "litCompSize:", litCompSize, "sizeFormat:", sizeFormat, "4X:", fourStreams)
}
var literals []byte
var huff *huff0.Scratch
if litRegenSize > int(b.WindowSize) || litRegenSize > maxCompressedBlockSize {
return in, ErrWindowSizeExceeded
}
switch litType {
case literalsBlockRaw:
if len(in) < litRegenSize {
println("too small: litType:", litType, " sizeFormat", sizeFormat, "remain:", len(in), "want:", litRegenSize)
return ErrBlockTooSmall
return in, ErrBlockTooSmall
}
literals = in[:litRegenSize]
in = in[litRegenSize:]
@ -406,7 +351,7 @@ func (b *blockDec) decodeCompressed(hist *history) error {
case literalsBlockRLE:
if len(in) < 1 {
println("too small: litType:", litType, " sizeFormat", sizeFormat, "remain:", len(in), "want:", 1)
return ErrBlockTooSmall
return in, ErrBlockTooSmall
}
if cap(b.literalBuf) < litRegenSize {
if b.lowMem {
@ -417,7 +362,6 @@ func (b *blockDec) decodeCompressed(hist *history) error {
b.literalBuf = make([]byte, litRegenSize)
} else {
b.literalBuf = make([]byte, litRegenSize, maxCompressedLiteralSize)
}
}
}
@ -433,7 +377,7 @@ func (b *blockDec) decodeCompressed(hist *history) error {
case literalsBlockTreeless:
if len(in) < litCompSize {
println("too small: litType:", litType, " sizeFormat", sizeFormat, "remain:", len(in), "want:", litCompSize)
return ErrBlockTooSmall
return in, ErrBlockTooSmall
}
// Store compressed literals, so we defer decoding until we get history.
literals = in[:litCompSize]
@ -441,15 +385,10 @@ func (b *blockDec) decodeCompressed(hist *history) error {
if debugDecoder {
printf("Found %d compressed literals\n", litCompSize)
}
case literalsBlockCompressed:
if len(in) < litCompSize {
println("too small: litType:", litType, " sizeFormat", sizeFormat, "remain:", len(in), "want:", litCompSize)
return ErrBlockTooSmall
huff := hist.huffTree
if huff == nil {
return in, errors.New("literal block was treeless, but no history was defined")
}
literals = in[:litCompSize]
in = in[litCompSize:]
huff = huffDecoderPool.Get().(*huff0.Scratch)
var err error
// Ensure we have space to store it.
if cap(b.literalBuf) < litRegenSize {
if b.lowMem {
@ -458,14 +397,53 @@ func (b *blockDec) decodeCompressed(hist *history) error {
b.literalBuf = make([]byte, 0, maxCompressedLiteralSize)
}
}
if huff == nil {
huff = &huff0.Scratch{}
var err error
// Use our out buffer.
huff.MaxDecodedSize = maxCompressedBlockSize
if fourStreams {
literals, err = huff.Decoder().Decompress4X(b.literalBuf[:0:litRegenSize], literals)
} else {
literals, err = huff.Decoder().Decompress1X(b.literalBuf[:0:litRegenSize], literals)
}
// Make sure we don't leak our literals buffer
if err != nil {
println("decompressing literals:", err)
return in, err
}
if len(literals) != litRegenSize {
return in, fmt.Errorf("literal output size mismatch want %d, got %d", litRegenSize, len(literals))
}
case literalsBlockCompressed:
if len(in) < litCompSize {
println("too small: litType:", litType, " sizeFormat", sizeFormat, "remain:", len(in), "want:", litCompSize)
return in, ErrBlockTooSmall
}
literals = in[:litCompSize]
in = in[litCompSize:]
// Ensure we have space to store it.
if cap(b.literalBuf) < litRegenSize {
if b.lowMem {
b.literalBuf = make([]byte, 0, litRegenSize)
} else {
b.literalBuf = make([]byte, 0, maxCompressedBlockSize)
}
}
huff := hist.huffTree
if huff == nil || (hist.dict != nil && huff == hist.dict.litEnc) {
huff = huffDecoderPool.Get().(*huff0.Scratch)
if huff == nil {
huff = &huff0.Scratch{}
}
}
var err error
huff, literals, err = huff0.ReadTable(literals, huff)
if err != nil {
println("reading huffman table:", err)
return err
return in, err
}
hist.huffTree = huff
huff.MaxDecodedSize = maxCompressedBlockSize
// Use our out buffer.
if fourStreams {
literals, err = huff.Decoder().Decompress4X(b.literalBuf[:0:litRegenSize], literals)
@ -474,24 +452,52 @@ func (b *blockDec) decodeCompressed(hist *history) error {
}
if err != nil {
println("decoding compressed literals:", err)
return err
return in, err
}
// Make sure we don't leak our literals buffer
if len(literals) != litRegenSize {
return fmt.Errorf("literal output size mismatch want %d, got %d", litRegenSize, len(literals))
return in, fmt.Errorf("literal output size mismatch want %d, got %d", litRegenSize, len(literals))
}
if debugDecoder {
printf("Decompressed %d literals into %d bytes\n", litCompSize, litRegenSize)
}
}
hist.decoders.literals = literals
return in, nil
}
// decodeCompressed will start decompressing a block.
func (b *blockDec) decodeCompressed(hist *history) error {
in := b.data
in, err := b.decodeLiterals(in, hist)
if err != nil {
return err
}
err = b.prepareSequences(in, hist)
if err != nil {
return err
}
if hist.decoders.nSeqs == 0 {
b.dst = append(b.dst, hist.decoders.literals...)
return nil
}
err = hist.decoders.decodeSync(hist)
if err != nil {
return err
}
b.dst = hist.decoders.out
hist.recentOffsets = hist.decoders.prevOffset
return nil
}
func (b *blockDec) prepareSequences(in []byte, hist *history) (err error) {
// Decode Sequences
// https://github.com/facebook/zstd/blob/dev/doc/zstd_compression_format.md#sequences-section
if len(in) < 1 {
return ErrBlockTooSmall
}
var nSeqs int
seqHeader := in[0]
nSeqs := 0
switch {
case seqHeader == 0:
in = in[1:]
@ -512,7 +518,8 @@ func (b *blockDec) decodeCompressed(hist *history) error {
in = in[3:]
}
var seqs = &sequenceDecs{}
var seqs = &hist.decoders
seqs.nSeqs = nSeqs
if nSeqs > 0 {
if len(in) < 1 {
return ErrBlockTooSmall
@ -541,6 +548,9 @@ func (b *blockDec) decodeCompressed(hist *history) error {
}
switch mode {
case compModePredefined:
if seq.fse != nil && !seq.fse.preDefined {
fseDecoderPool.Put(seq.fse)
}
seq.fse = &fsePredef[i]
case compModeRLE:
if br.remain() < 1 {
@ -548,34 +558,36 @@ func (b *blockDec) decodeCompressed(hist *history) error {
}
v := br.Uint8()
br.advance(1)
dec := fseDecoderPool.Get().(*fseDecoder)
if seq.fse == nil || seq.fse.preDefined {
seq.fse = fseDecoderPool.Get().(*fseDecoder)
}
symb, err := decSymbolValue(v, symbolTableX[i])
if err != nil {
printf("RLE Transform table (%v) error: %v", tableIndex(i), err)
return err
}
dec.setRLE(symb)
seq.fse = dec
seq.fse.setRLE(symb)
if debugDecoder {
printf("RLE set to %+v, code: %v", symb, v)
}
case compModeFSE:
println("Reading table for", tableIndex(i))
dec := fseDecoderPool.Get().(*fseDecoder)
err := dec.readNCount(&br, uint16(maxTableSymbol[i]))
if seq.fse == nil || seq.fse.preDefined {
seq.fse = fseDecoderPool.Get().(*fseDecoder)
}
err := seq.fse.readNCount(&br, uint16(maxTableSymbol[i]))
if err != nil {
println("Read table error:", err)
return err
}
err = dec.transform(symbolTableX[i])
err = seq.fse.transform(symbolTableX[i])
if err != nil {
println("Transform table error:", err)
return err
}
if debugDecoder {
println("Read table ok", "symbolLen:", dec.symbolLen)
println("Read table ok", "symbolLen:", seq.fse.symbolLen)
}
seq.fse = dec
case compModeRepeat:
seq.repeat = true
}
@ -585,140 +597,88 @@ func (b *blockDec) decodeCompressed(hist *history) error {
}
in = br.unread()
}
// Wait for history.
// All time spent after this is critical since it is strictly sequential.
if hist == nil {
hist = <-b.history
if hist.error {
return ErrDecoderClosed
}
}
// Decode treeless literal block.
if litType == literalsBlockTreeless {
// TODO: We could send the history early WITHOUT the stream history.
// This would allow decoding treeless literals before the byte history is available.
// Silencia stats: Treeless 4393, with: 32775, total: 37168, 11% treeless.
// So not much obvious gain here.
if hist.huffTree == nil {
return errors.New("literal block was treeless, but no history was defined")
}
// Ensure we have space to store it.
if cap(b.literalBuf) < litRegenSize {
if b.lowMem {
b.literalBuf = make([]byte, 0, litRegenSize)
} else {
b.literalBuf = make([]byte, 0, maxCompressedLiteralSize)
}
}
var err error
// Use our out buffer.
huff = hist.huffTree
if fourStreams {
literals, err = huff.Decoder().Decompress4X(b.literalBuf[:0:litRegenSize], literals)
} else {
literals, err = huff.Decoder().Decompress1X(b.literalBuf[:0:litRegenSize], literals)
}
// Make sure we don't leak our literals buffer
if err != nil {
println("decompressing literals:", err)
return err
}
if len(literals) != litRegenSize {
return fmt.Errorf("literal output size mismatch want %d, got %d", litRegenSize, len(literals))
}
} else {
if hist.huffTree != nil && huff != nil {
if hist.dict == nil || hist.dict.litEnc != hist.huffTree {
huffDecoderPool.Put(hist.huffTree)
}
hist.huffTree = nil
}
}
if huff != nil {
hist.huffTree = huff
}
if debugDecoder {
println("Final literals:", len(literals), "hash:", xxhash.Sum64(literals), "and", nSeqs, "sequences.")
println("Literals:", len(seqs.literals), "hash:", xxhash.Sum64(seqs.literals), "and", seqs.nSeqs, "sequences.")
}
if nSeqs == 0 {
// Decompressed content is defined entirely as Literals Section content.
b.dst = append(b.dst, literals...)
if delayedHistory {
hist.append(literals)
if len(b.sequence) > 0 {
b.sequence = b.sequence[:0]
}
return nil
}
seqs, err := seqs.mergeHistory(&hist.decoders)
if err != nil {
return err
br := seqs.br
if br == nil {
br = &bitReader{}
}
if debugDecoder {
println("History merged ok")
}
br := &bitReader{}
if err := br.init(in); err != nil {
return err
}
// TODO: Investigate if sending history without decoders are faster.
// This would allow the sequences to be decoded async and only have to construct stream history.
// If only recent offsets were not transferred, this would be an obvious win.
// Also, if first 3 sequences don't reference recent offsets, all sequences can be decoded.
if err := seqs.initialize(br, hist, b.dst); err != nil {
println("initializing sequences:", err)
return err
}
return nil
}
func (b *blockDec) decodeSequences(hist *history) error {
if cap(b.sequence) < hist.decoders.nSeqs {
if b.lowMem {
b.sequence = make([]seqVals, 0, hist.decoders.nSeqs)
} else {
b.sequence = make([]seqVals, 0, 0x7F00+0xffff)
}
}
b.sequence = b.sequence[:hist.decoders.nSeqs]
if hist.decoders.nSeqs == 0 {
hist.decoders.seqSize = len(hist.decoders.literals)
return nil
}
hist.decoders.prevOffset = hist.recentOffsets
err := hist.decoders.decode(b.sequence)
hist.recentOffsets = hist.decoders.prevOffset
return err
}
func (b *blockDec) executeSequences(hist *history) error {
hbytes := hist.b
if len(hbytes) > hist.windowSize {
hbytes = hbytes[len(hbytes)-hist.windowSize:]
// We do not need history any more.
// We do not need history anymore.
if hist.dict != nil {
hist.dict.content = nil
}
}
if err := seqs.initialize(br, hist, literals, b.dst); err != nil {
println("initializing sequences:", err)
return err
}
err = seqs.decode(nSeqs, br, hbytes)
hist.decoders.windowSize = hist.windowSize
hist.decoders.out = b.dst[:0]
err := hist.decoders.execute(b.sequence, hbytes)
if err != nil {
return err
}
if !br.finished() {
return fmt.Errorf("%d extra bits on block, should be 0", br.remain())
}
return b.updateHistory(hist)
}
err = br.close()
if err != nil {
printf("Closing sequences: %v, %+v\n", err, *br)
}
func (b *blockDec) updateHistory(hist *history) error {
if len(b.data) > maxCompressedBlockSize {
return fmt.Errorf("compressed block size too large (%d)", len(b.data))
}
// Set output and release references.
b.dst = seqs.out
seqs.out, seqs.literals, seqs.hist = nil, nil, nil
b.dst = hist.decoders.out
hist.recentOffsets = hist.decoders.prevOffset
if !delayedHistory {
// If we don't have delayed history, no need to update.
hist.recentOffsets = seqs.prevOffset
return nil
}
if b.Last {
// if last block we don't care about history.
println("Last block, no history returned")
hist.b = hist.b[:0]
return nil
} else {
hist.append(b.dst)
if debugDecoder {
println("Finished block with ", len(b.sequence), "sequences. Added", len(b.dst), "to history, now length", len(hist.b))
}
}
hist.append(b.dst)
hist.recentOffsets = seqs.prevOffset
if debugDecoder {
println("Finished block with literals:", len(literals), "and", nSeqs, "sequences.")
}
hist.decoders.out, hist.decoders.literals = nil, nil
return nil
}

3
vendor/github.com/klauspost/compress/zstd/bytebuf.go generated vendored
View File

@ -113,6 +113,9 @@ func (r *readerWrapper) readBig(n int, dst []byte) ([]byte, error) {
func (r *readerWrapper) readByte() (byte, error) {
n2, err := r.r.Read(r.tmp[:1])
if err != nil {
if err == io.EOF {
err = io.ErrUnexpectedEOF
}
return 0, err
}
if n2 != 1 {

644
vendor/github.com/klauspost/compress/zstd/decoder.go generated vendored
View File

@ -5,9 +5,13 @@
package zstd
import (
"errors"
"bytes"
"context"
"encoding/binary"
"io"
"sync"
"github.com/klauspost/compress/zstd/internal/xxhash"
)
// Decoder provides decoding of zstandard streams.
@ -22,12 +26,19 @@ type Decoder struct {
// Unreferenced decoders, ready for use.
decoders chan *blockDec
// Streams ready to be decoded.
stream chan decodeStream
// Current read position used for Reader functionality.
current decoderState
// sync stream decoding
syncStream struct {
decodedFrame uint64
br readerWrapper
enabled bool
inFrame bool
}
frame *frameDec
// Custom dictionaries.
// Always uses copies.
dicts map[uint32]dict
@ -46,7 +57,10 @@ type decoderState struct {
output chan decodeOutput
// cancel remaining output.
cancel chan struct{}
cancel context.CancelFunc
// crc of current frame
crc *xxhash.Digest
flushed bool
}
@ -81,7 +95,7 @@ func NewReader(r io.Reader, opts ...DOption) (*Decoder, error) {
return nil, err
}
}
d.current.output = make(chan decodeOutput, d.o.concurrent)
d.current.crc = xxhash.New()
d.current.flushed = true
if r == nil {
@ -130,7 +144,7 @@ func (d *Decoder) Read(p []byte) (int, error) {
break
}
if !d.nextBlock(n == 0) {
return n, nil
return n, d.current.err
}
}
}
@ -162,6 +176,7 @@ func (d *Decoder) Reset(r io.Reader) error {
d.drainOutput()
d.syncStream.br.r = nil
if r == nil {
d.current.err = ErrDecoderNilInput
if len(d.current.b) > 0 {
@ -195,33 +210,39 @@ func (d *Decoder) Reset(r io.Reader) error {
}
return nil
}
if d.stream == nil {
d.stream = make(chan decodeStream, 1)
d.streamWg.Add(1)
go d.startStreamDecoder(d.stream)
}
// Remove current block.
d.stashDecoder()
d.current.decodeOutput = decodeOutput{}
d.current.err = nil
d.current.cancel = make(chan struct{})
d.current.flushed = false
d.current.d = nil
d.stream <- decodeStream{
r: r,
output: d.current.output,
cancel: d.current.cancel,
// Ensure no-one else is still running...
d.streamWg.Wait()
if d.frame == nil {
d.frame = newFrameDec(d.o)
}
if d.o.concurrent == 1 {
return d.startSyncDecoder(r)
}
d.current.output = make(chan decodeOutput, d.o.concurrent)
ctx, cancel := context.WithCancel(context.Background())
d.current.cancel = cancel
d.streamWg.Add(1)
go d.startStreamDecoder(ctx, r, d.current.output)
return nil
}
// drainOutput will drain the output until errEndOfStream is sent.
func (d *Decoder) drainOutput() {
if d.current.cancel != nil {
println("cancelling current")
close(d.current.cancel)
if debugDecoder {
println("cancelling current")
}
d.current.cancel()
d.current.cancel = nil
}
if d.current.d != nil {
@ -243,12 +264,9 @@ func (d *Decoder) drainOutput() {
}
d.decoders <- v.d
}
if v.err == errEndOfStream {
println("current flushed")
d.current.flushed = true
return
}
}
d.current.output = nil
d.current.flushed = true
}
// WriteTo writes data to w until there's no more data to write or when an error occurs.
@ -287,7 +305,7 @@ func (d *Decoder) WriteTo(w io.Writer) (int64, error) {
// DecodeAll can be used concurrently.
// The Decoder concurrency limits will be respected.
func (d *Decoder) DecodeAll(input, dst []byte) ([]byte, error) {
if d.current.err == ErrDecoderClosed {
if d.decoders == nil {
return dst, ErrDecoderClosed
}
@ -300,6 +318,9 @@ func (d *Decoder) DecodeAll(input, dst []byte) ([]byte, error) {
}
frame.rawInput = nil
frame.bBuf = nil
if frame.history.decoders.br != nil {
frame.history.decoders.br.in = nil
}
d.decoders <- block
}()
frame.bBuf = input
@ -307,27 +328,31 @@ func (d *Decoder) DecodeAll(input, dst []byte) ([]byte, error) {
for {
frame.history.reset()
err := frame.reset(&frame.bBuf)
if err == io.EOF {
if debugDecoder {
println("frame reset return EOF")
if err != nil {
if err == io.EOF {
if debugDecoder {
println("frame reset return EOF")
}
return dst, nil
}
return dst, nil
return dst, err
}
if frame.DictionaryID != nil {
dict, ok := d.dicts[*frame.DictionaryID]
if !ok {
return nil, ErrUnknownDictionary
}
if debugDecoder {
println("setting dict", frame.DictionaryID)
}
frame.history.setDict(&dict)
}
if err != nil {
return dst, err
}
if frame.FrameContentSize > d.o.maxDecodedSize-uint64(len(dst)) {
return dst, ErrDecoderSizeExceeded
}
if frame.FrameContentSize > 0 && frame.FrameContentSize < 1<<30 {
// Never preallocate moe than 1 GB up front.
// Never preallocate more than 1 GB up front.
if cap(dst)-len(dst) < int(frame.FrameContentSize) {
dst2 := make([]byte, len(dst), len(dst)+int(frame.FrameContentSize))
copy(dst2, dst)
@ -368,6 +393,161 @@ func (d *Decoder) DecodeAll(input, dst []byte) ([]byte, error) {
// If non-blocking mode is used the returned boolean will be false
// if no data was available without blocking.
func (d *Decoder) nextBlock(blocking bool) (ok bool) {
if d.current.err != nil {
// Keep error state.
return false
}
d.current.b = d.current.b[:0]
// SYNC:
if d.syncStream.enabled {
if !blocking {
return false
}
ok = d.nextBlockSync()
if !ok {
d.stashDecoder()
}
return ok
}
//ASYNC:
d.stashDecoder()
if blocking {
d.current.decodeOutput, ok = <-d.current.output
} else {
select {
case d.current.decodeOutput, ok = <-d.current.output:
default:
return false
}
}
if !ok {
// This should not happen, so signal error state...
d.current.err = io.ErrUnexpectedEOF
return false
}
next := d.current.decodeOutput
if next.d != nil && next.d.async.newHist != nil {
d.current.crc.Reset()
}
if debugDecoder {
var tmp [4]byte
binary.LittleEndian.PutUint32(tmp[:], uint32(xxhash.Sum64(next.b)))
println("got", len(d.current.b), "bytes, error:", d.current.err, "data crc:", tmp)
}
if len(next.b) > 0 {
n, err := d.current.crc.Write(next.b)
if err == nil {
if n != len(next.b) {
d.current.err = io.ErrShortWrite
}
}
}
if next.err == nil && next.d != nil && len(next.d.checkCRC) != 0 {
got := d.current.crc.Sum64()
var tmp [4]byte
binary.LittleEndian.PutUint32(tmp[:], uint32(got))
if !bytes.Equal(tmp[:], next.d.checkCRC) && !ignoreCRC {
if debugDecoder {
println("CRC Check Failed:", tmp[:], " (got) !=", next.d.checkCRC, "(on stream)")
}
d.current.err = ErrCRCMismatch
} else {
if debugDecoder {
println("CRC ok", tmp[:])
}
}
}
return true
}
func (d *Decoder) nextBlockSync() (ok bool) {
if d.current.d == nil {
d.current.d = <-d.decoders
}
for len(d.current.b) == 0 {
if !d.syncStream.inFrame {
d.frame.history.reset()
d.current.err = d.frame.reset(&d.syncStream.br)
if d.current.err != nil {
return false
}
if d.frame.DictionaryID != nil {
dict, ok := d.dicts[*d.frame.DictionaryID]
if !ok {
d.current.err = ErrUnknownDictionary
return false
} else {
d.frame.history.setDict(&dict)
}
}
if d.frame.WindowSize > d.o.maxDecodedSize || d.frame.WindowSize > d.o.maxWindowSize {
d.current.err = ErrDecoderSizeExceeded
return false
}
d.syncStream.decodedFrame = 0
d.syncStream.inFrame = true
}
d.current.err = d.frame.next(d.current.d)
if d.current.err != nil {
return false
}
d.frame.history.ensureBlock()
if debugDecoder {
println("History trimmed:", len(d.frame.history.b), "decoded already:", d.syncStream.decodedFrame)
}
histBefore := len(d.frame.history.b)
d.current.err = d.current.d.decodeBuf(&d.frame.history)
if d.current.err != nil {
println("error after:", d.current.err)
return false
}
d.current.b = d.frame.history.b[histBefore:]
if debugDecoder {
println("history after:", len(d.frame.history.b))
}
// Check frame size (before CRC)
d.syncStream.decodedFrame += uint64(len(d.current.b))
if d.frame.FrameContentSize > 0 && d.syncStream.decodedFrame > d.frame.FrameContentSize {
if debugDecoder {
printf("DecodedFrame (%d) > FrameContentSize (%d)\n", d.syncStream.decodedFrame, d.frame.FrameContentSize)
}
d.current.err = ErrFrameSizeExceeded
return false
}
// Check FCS
if d.current.d.Last && d.frame.FrameContentSize > 0 && d.syncStream.decodedFrame != d.frame.FrameContentSize {
if debugDecoder {
printf("DecodedFrame (%d) != FrameContentSize (%d)\n", d.syncStream.decodedFrame, d.frame.FrameContentSize)
}
d.current.err = ErrFrameSizeMismatch
return false
}
// Update/Check CRC
if d.frame.HasCheckSum {
d.frame.crc.Write(d.current.b)
if d.current.d.Last {
d.current.err = d.frame.checkCRC()
if d.current.err != nil {
println("CRC error:", d.current.err)
return false
}
}
}
d.syncStream.inFrame = !d.current.d.Last
}
return true
}
func (d *Decoder) stashDecoder() {
if d.current.d != nil {
if debugDecoder {
printf("re-adding current decoder %p", d.current.d)
@ -375,24 +555,6 @@ func (d *Decoder) nextBlock(blocking bool) (ok bool) {
d.decoders <- d.current.d
d.current.d = nil
}
if d.current.err != nil {
// Keep error state.
return blocking
}
if blocking {
d.current.decodeOutput = <-d.current.output
} else {
select {
case d.current.decodeOutput = <-d.current.output:
default:
return false
}
}
if debugDecoder {
println("got", len(d.current.b), "bytes, error:", d.current.err)
}
return true
}
// Close will release all resources.
@ -402,10 +564,10 @@ func (d *Decoder) Close() {
return
}
d.drainOutput()
if d.stream != nil {
close(d.stream)
if d.current.cancel != nil {
d.current.cancel()
d.streamWg.Wait()
d.stream = nil
d.current.cancel = nil
}
if d.decoders != nil {
close(d.decoders)
@ -456,100 +618,306 @@ type decodeOutput struct {
err error
}
type decodeStream struct {
r io.Reader
// Blocks ready to be written to output.
output chan decodeOutput
// cancel reading from the input
cancel chan struct{}
func (d *Decoder) startSyncDecoder(r io.Reader) error {
d.frame.history.reset()
d.syncStream.br = readerWrapper{r: r}
d.syncStream.inFrame = false
d.syncStream.enabled = true
d.syncStream.decodedFrame = 0
return nil
}
// errEndOfStream indicates that everything from the stream was read.
var errEndOfStream = errors.New("end-of-stream")
// Create Decoder:
// Spawn n block decoders. These accept tasks to decode a block.
// Create goroutine that handles stream processing, this will send history to decoders as they are available.
// Decoders update the history as they decode.
// When a block is returned:
// a) history is sent to the next decoder,
// b) content written to CRC.
// c) return data to WRITER.
// d) wait for next block to return data.
// Once WRITTEN, the decoders reused by the writer frame decoder for re-use.
func (d *Decoder) startStreamDecoder(inStream chan decodeStream) {
// ASYNC:
// Spawn 4 go routines.
// 0: Read frames and decode blocks.
// 1: Decode block and literals. Receives hufftree and seqdecs, returns seqdecs and huff tree.
// 2: Wait for recentOffsets if needed. Decode sequences, send recentOffsets.
// 3: Wait for stream history, execute sequences, send stream history.
func (d *Decoder) startStreamDecoder(ctx context.Context, r io.Reader, output chan decodeOutput) {
defer d.streamWg.Done()
frame := newFrameDec(d.o)
for stream := range inStream {
if debugDecoder {
println("got new stream")
br := readerWrapper{r: r}
var seqPrepare = make(chan *blockDec, d.o.concurrent)
var seqDecode = make(chan *blockDec, d.o.concurrent)
var seqExecute = make(chan *blockDec, d.o.concurrent)
// Async 1: Prepare blocks...
go func() {
var hist history
var hasErr bool
for block := range seqPrepare {
if hasErr {
if block != nil {
seqDecode <- block
}
continue
}
if block.async.newHist != nil {
if debugDecoder {
println("Async 1: new history")
}
hist.reset()
if block.async.newHist.dict != nil {
hist.setDict(block.async.newHist.dict)
}
}
if block.err != nil || block.Type != blockTypeCompressed {
hasErr = block.err != nil
seqDecode <- block
continue
}
remain, err := block.decodeLiterals(block.data, &hist)
block.err = err
hasErr = block.err != nil
if err == nil {
block.async.literals = hist.decoders.literals
block.async.seqData = remain
} else if debugDecoder {
println("decodeLiterals error:", err)
}
seqDecode <- block
}
br := readerWrapper{r: stream.r}
decodeStream:
for {
frame.history.reset()
err := frame.reset(&br)
if debugDecoder && err != nil {
println("Frame decoder returned", err)
close(seqDecode)
}()
// Async 2: Decode sequences...
go func() {
var hist history
var hasErr bool
for block := range seqDecode {
if hasErr {
if block != nil {
seqExecute <- block
}
continue
}
if err == nil && frame.DictionaryID != nil {
dict, ok := d.dicts[*frame.DictionaryID]
if !ok {
err = ErrUnknownDictionary
if block.async.newHist != nil {
if debugDecoder {
println("Async 2: new history, recent:", block.async.newHist.recentOffsets)
}
hist.decoders = block.async.newHist.decoders
hist.recentOffsets = block.async.newHist.recentOffsets
if block.async.newHist.dict != nil {
hist.setDict(block.async.newHist.dict)
}
}
if block.err != nil || block.Type != blockTypeCompressed {
hasErr = block.err != nil
seqExecute <- block
continue
}
hist.decoders.literals = block.async.literals
block.err = block.prepareSequences(block.async.seqData, &hist)
if debugDecoder && block.err != nil {
println("prepareSequences returned:", block.err)
}
hasErr = block.err != nil
if block.err == nil {
block.err = block.decodeSequences(&hist)
if debugDecoder && block.err != nil {
println("decodeSequences returned:", block.err)
}
hasErr = block.err != nil
// block.async.sequence = hist.decoders.seq[:hist.decoders.nSeqs]
block.async.seqSize = hist.decoders.seqSize
}
seqExecute <- block
}
close(seqExecute)
}()
var wg sync.WaitGroup
wg.Add(1)
// Async 3: Execute sequences...
frameHistCache := d.frame.history.b
go func() {
var hist history
var decodedFrame uint64
var fcs uint64
var hasErr bool
for block := range seqExecute {
out := decodeOutput{err: block.err, d: block}
if block.err != nil || hasErr {
hasErr = true
output <- out
continue
}
if block.async.newHist != nil {
if debugDecoder {
println("Async 3: new history")
}
hist.windowSize = block.async.newHist.windowSize
hist.allocFrameBuffer = block.async.newHist.allocFrameBuffer
if block.async.newHist.dict != nil {
hist.setDict(block.async.newHist.dict)
}
if cap(hist.b) < hist.allocFrameBuffer {
if cap(frameHistCache) >= hist.allocFrameBuffer {
hist.b = frameHistCache
} else {
hist.b = make([]byte, 0, hist.allocFrameBuffer)
println("Alloc history sized", hist.allocFrameBuffer)
}
}
hist.b = hist.b[:0]
fcs = block.async.fcs
decodedFrame = 0
}
do := decodeOutput{err: block.err, d: block}
switch block.Type {
case blockTypeRLE:
if debugDecoder {
println("add rle block length:", block.RLESize)
}
if cap(block.dst) < int(block.RLESize) {
if block.lowMem {
block.dst = make([]byte, block.RLESize)
} else {
block.dst = make([]byte, maxBlockSize)
}
}
block.dst = block.dst[:block.RLESize]
v := block.data[0]
for i := range block.dst {
block.dst[i] = v
}
hist.append(block.dst)
do.b = block.dst
case blockTypeRaw:
if debugDecoder {
println("add raw block length:", len(block.data))
}
hist.append(block.data)
do.b = block.data
case blockTypeCompressed:
if debugDecoder {
println("execute with history length:", len(hist.b), "window:", hist.windowSize)
}
hist.decoders.seqSize = block.async.seqSize
hist.decoders.literals = block.async.literals
do.err = block.executeSequences(&hist)
hasErr = do.err != nil
if debugDecoder && hasErr {
println("executeSequences returned:", do.err)
}
do.b = block.dst
}
if !hasErr {
decodedFrame += uint64(len(do.b))
if fcs > 0 && decodedFrame > fcs {
println("fcs exceeded", block.Last, fcs, decodedFrame)
do.err = ErrFrameSizeExceeded
hasErr = true
} else if block.Last && fcs > 0 && decodedFrame != fcs {
do.err = ErrFrameSizeMismatch
hasErr = true
} else {
frame.history.setDict(&dict)
if debugDecoder {
println("fcs ok", block.Last, fcs, decodedFrame)
}
}
}
if err != nil {
stream.output <- decodeOutput{
err: err,
output <- do
}
close(output)
frameHistCache = hist.b
wg.Done()
if debugDecoder {
println("decoder goroutines finished")
}
}()
decodeStream:
for {
frame := d.frame
if debugDecoder {
println("New frame...")
}
var historySent bool
frame.history.reset()
err := frame.reset(&br)
if debugDecoder && err != nil {
println("Frame decoder returned", err)
}
if err == nil && frame.DictionaryID != nil {
dict, ok := d.dicts[*frame.DictionaryID]
if !ok {
err = ErrUnknownDictionary
} else {
frame.history.setDict(&dict)
}
}
if err == nil && d.frame.WindowSize > d.o.maxWindowSize {
err = ErrDecoderSizeExceeded
}
if err != nil {
select {
case <-ctx.Done():
case dec := <-d.decoders:
dec.sendErr(err)
seqPrepare <- dec
}
break decodeStream
}
// Go through all blocks of the frame.
for {
var dec *blockDec
select {
case <-ctx.Done():
break decodeStream
case dec = <-d.decoders:
// Once we have a decoder, we MUST return it.
}
err := frame.next(dec)
if !historySent {
h := frame.history
if debugDecoder {
println("Alloc History:", h.allocFrameBuffer)
}
dec.async.newHist = &h
dec.async.fcs = frame.FrameContentSize
historySent = true
} else {
dec.async.newHist = nil
}
if debugDecoder && err != nil {
println("next block returned error:", err)
}
dec.err = err
dec.checkCRC = nil
if dec.Last && frame.HasCheckSum && err == nil {
crc, err := frame.rawInput.readSmall(4)
if err != nil {
println("CRC missing?", err)
dec.err = err
}
var tmp [4]byte
copy(tmp[:], crc)
dec.checkCRC = tmp[:]
if debugDecoder {
println("found crc to check:", dec.checkCRC)
}
}
err = dec.err
last := dec.Last
seqPrepare <- dec
if err != nil {
break decodeStream
}
if last {
break
}
if debugDecoder {
println("starting frame decoder")
}
// This goroutine will forward history between frames.
frame.frameDone.Add(1)
frame.initAsync()
go frame.startDecoder(stream.output)
decodeFrame:
// Go through all blocks of the frame.
for {
dec := <-d.decoders
select {
case <-stream.cancel:
if !frame.sendErr(dec, io.EOF) {
// To not let the decoder dangle, send it back.
stream.output <- decodeOutput{d: dec}
}
break decodeStream
default:
}
err := frame.next(dec)
switch err {
case io.EOF:
// End of current frame, no error
println("EOF on next block")
break decodeFrame
case nil:
continue
default:
println("block decoder returned", err)
break decodeStream
}
}
// All blocks have started decoding, check if there are more frames.
println("waiting for done")
frame.frameDone.Wait()
println("done waiting...")
}
frame.frameDone.Wait()
println("Sending EOS")
stream.output <- decodeOutput{err: errEndOfStream}
}
close(seqPrepare)
wg.Wait()
d.frame.history.b = frameHistCache
}

24
vendor/github.com/klauspost/compress/zstd/decoder_options.go generated vendored
View File

@ -28,6 +28,9 @@ func (o *decoderOptions) setDefault() {
concurrent: runtime.GOMAXPROCS(0),
maxWindowSize: MaxWindowSize,
}
if o.concurrent > 4 {
o.concurrent = 4
}
o.maxDecodedSize = 1 << 63
}
@ -37,16 +40,25 @@ func WithDecoderLowmem(b bool) DOption {
return func(o *decoderOptions) error { o.lowMem = b; return nil }
}
// WithDecoderConcurrency will set the concurrency,
// meaning the maximum number of decoders to run concurrently.
// The value supplied must be at least 1.
// By default this will be set to GOMAXPROCS.
// WithDecoderConcurrency sets the number of created decoders.
// When decoding block with DecodeAll, this will limit the number
// of possible concurrently running decodes.
// When decoding streams, this will limit the number of
// inflight blocks.
// When decoding streams and setting maximum to 1,
// no async decoding will be done.
// When a value of 0 is provided GOMAXPROCS will be used.
// By default this will be set to 4 or GOMAXPROCS, whatever is lower.
func WithDecoderConcurrency(n int) DOption {
return func(o *decoderOptions) error {
if n <= 0 {
if n < 0 {
return errors.New("concurrency must be at least 1")
}
o.concurrent = n
if n == 0 {
o.concurrent = runtime.GOMAXPROCS(0)
} else {
o.concurrent = n
}
return nil
}
}

66
vendor/github.com/klauspost/compress/zstd/encoder.go generated vendored
View File

@ -98,23 +98,25 @@ func (e *Encoder) Reset(w io.Writer) {
if cap(s.filling) == 0 {
s.filling = make([]byte, 0, e.o.blockSize)
}
if cap(s.current) == 0 {
s.current = make([]byte, 0, e.o.blockSize)
}
if cap(s.previous) == 0 {
s.previous = make([]byte, 0, e.o.blockSize)
if e.o.concurrent > 1 {
if cap(s.current) == 0 {
s.current = make([]byte, 0, e.o.blockSize)
}
if cap(s.previous) == 0 {
s.previous = make([]byte, 0, e.o.blockSize)
}
s.current = s.current[:0]
s.previous = s.previous[:0]
if s.writing == nil {
s.writing = &blockEnc{lowMem: e.o.lowMem}
s.writing.init()
}
s.writing.initNewEncode()
}
if s.encoder == nil {
s.encoder = e.o.encoder()
}
if s.writing == nil {
s.writing = &blockEnc{lowMem: e.o.lowMem}
s.writing.init()
}
s.writing.initNewEncode()
s.filling = s.filling[:0]
s.current = s.current[:0]
s.previous = s.previous[:0]
s.encoder.Reset(e.o.dict, false)
s.headerWritten = false
s.eofWritten = false
@ -258,6 +260,46 @@ func (e *Encoder) nextBlock(final bool) error {
return s.err
}
// SYNC:
if e.o.concurrent == 1 {
src := s.filling
s.nInput += int64(len(s.filling))
if debugEncoder {
println("Adding sync block,", len(src), "bytes, final:", final)
}
enc := s.encoder
blk := enc.Block()
blk.reset(nil)
enc.Encode(blk, src)
blk.last = final
if final {
s.eofWritten = true
}
err := errIncompressible
// If we got the exact same number of literals as input,
// assume the literals cannot be compressed.
if len(src) != len(blk.literals) || len(src) != e.o.blockSize {
err = blk.encode(src, e.o.noEntropy, !e.o.allLitEntropy)
}
switch err {
case errIncompressible:
if debugEncoder {
println("Storing incompressible block as raw")
}
blk.encodeRaw(src)
// In fast mode, we do not transfer offsets, so we don't have to deal with changing the.
case nil:
default:
s.err = err
return err
}
_, s.err = s.w.Write(blk.output)
s.nWritten += int64(len(blk.output))
s.filling = s.filling[:0]
return s.err
}
// Move blocks forward.
s.filling, s.current, s.previous = s.previous[:0], s.filling, s.current
s.nInput += int64(len(s.current))

1
vendor/github.com/klauspost/compress/zstd/encoder_options.go generated vendored
View File

@ -76,6 +76,7 @@ func WithEncoderCRC(b bool) EOption {
// WithEncoderConcurrency will set the concurrency,
// meaning the maximum number of encoders to run concurrently.
// The value supplied must be at least 1.
// For streams, setting a value of 1 will disable async compression.
// By default this will be set to GOMAXPROCS.
func WithEncoderConcurrency(n int) EOption {
return func(o *encoderOptions) error {

202
vendor/github.com/klauspost/compress/zstd/framedec.go generated vendored
View File

@ -8,23 +8,17 @@ import (
"bytes"
"encoding/hex"
"errors"
"hash"
"io"
"sync"
"github.com/klauspost/compress/zstd/internal/xxhash"
)
type frameDec struct {
o decoderOptions
crc hash.Hash64
offset int64
o decoderOptions
crc *xxhash.Digest
WindowSize uint64
// In order queue of blocks being decoded.
decoding chan *blockDec
// Frame history passed between blocks
history history
@ -34,15 +28,10 @@ type frameDec struct {
bBuf byteBuf
FrameContentSize uint64
frameDone sync.WaitGroup
DictionaryID *uint32
HasCheckSum bool
SingleSegment bool
// asyncRunning indicates whether the async routine processes input on 'decoding'.
asyncRunningMu sync.Mutex
asyncRunning bool
}
const (
@ -229,9 +218,10 @@ func (d *frameDec) reset(br byteBuffer) error {
d.FrameContentSize = uint64(d1) | (uint64(d2) << 32)
}
if debugDecoder {
println("field size bits:", v, "fcsSize:", fcsSize, "FrameContentSize:", d.FrameContentSize, hex.EncodeToString(b[:fcsSize]), "singleseg:", d.SingleSegment, "window:", d.WindowSize)
println("Read FCS:", d.FrameContentSize)
}
}
// Move this to shared.
d.HasCheckSum = fhd&(1<<2) != 0
if d.HasCheckSum {
@ -264,10 +254,16 @@ func (d *frameDec) reset(br byteBuffer) error {
}
d.history.windowSize = int(d.WindowSize)
if d.o.lowMem && d.history.windowSize < maxBlockSize {
d.history.maxSize = d.history.windowSize * 2
d.history.allocFrameBuffer = d.history.windowSize * 2
// TODO: Maybe use FrameContent size
} else {
d.history.maxSize = d.history.windowSize + maxBlockSize
d.history.allocFrameBuffer = d.history.windowSize + maxBlockSize
}
if debugDecoder {
println("Frame: Dict:", d.DictionaryID, "FrameContentSize:", d.FrameContentSize, "singleseg:", d.SingleSegment, "window:", d.WindowSize, "crc:", d.HasCheckSum)
}
// history contains input - maybe we do something
d.rawInput = br
return nil
@ -276,49 +272,18 @@ func (d *frameDec) reset(br byteBuffer) error {
// next will start decoding the next block from stream.
func (d *frameDec) next(block *blockDec) error {
if debugDecoder {
printf("decoding new block %p:%p", block, block.data)
println("decoding new block")
}
err := block.reset(d.rawInput, d.WindowSize)
if err != nil {
println("block error:", err)
// Signal the frame decoder we have a problem.
d.sendErr(block, err)
block.sendErr(err)
return err
}
block.input <- struct{}{}
if debugDecoder {
println("next block:", block)
}
d.asyncRunningMu.Lock()
defer d.asyncRunningMu.Unlock()
if !d.asyncRunning {
return nil
}
if block.Last {
// We indicate the frame is done by sending io.EOF
d.decoding <- block
return io.EOF
}
d.decoding <- block
return nil
}
// sendEOF will queue an error block on the frame.
// This will cause the frame decoder to return when it encounters the block.
// Returns true if the decoder was added.
func (d *frameDec) sendErr(block *blockDec, err error) bool {
d.asyncRunningMu.Lock()
defer d.asyncRunningMu.Unlock()
if !d.asyncRunning {
return false
}
println("sending error", err.Error())
block.sendErr(err)
d.decoding <- block
return true
}
// checkCRC will check the checksum if the frame has one.
// Will return ErrCRCMismatch if crc check failed, otherwise nil.
func (d *frameDec) checkCRC() error {
@ -340,7 +305,7 @@ func (d *frameDec) checkCRC() error {
return err
}
if !bytes.Equal(tmp[:], want) {
if !bytes.Equal(tmp[:], want) && !ignoreCRC {
if debugDecoder {
println("CRC Check Failed:", tmp[:], "!=", want)
}
@ -352,131 +317,13 @@ func (d *frameDec) checkCRC() error {
return nil
}
func (d *frameDec) initAsync() {
if !d.o.lowMem && !d.SingleSegment {
// set max extra size history to 2MB.
d.history.maxSize = d.history.windowSize + maxBlockSize
}
// re-alloc if more than one extra block size.
if d.o.lowMem && cap(d.history.b) > d.history.maxSize+maxBlockSize {
d.history.b = make([]byte, 0, d.history.maxSize)
}
if cap(d.history.b) < d.history.maxSize {
d.history.b = make([]byte, 0, d.history.maxSize)
}
if cap(d.decoding) < d.o.concurrent {
d.decoding = make(chan *blockDec, d.o.concurrent)
}
if debugDecoder {
h := d.history
printf("history init. len: %d, cap: %d", len(h.b), cap(h.b))
}
d.asyncRunningMu.Lock()
d.asyncRunning = true
d.asyncRunningMu.Unlock()
}
// startDecoder will start decoding blocks and write them to the writer.
// The decoder will stop as soon as an error occurs or at end of frame.
// When the frame has finished decoding the *bufio.Reader
// containing the remaining input will be sent on frameDec.frameDone.
func (d *frameDec) startDecoder(output chan decodeOutput) {
written := int64(0)
defer func() {
d.asyncRunningMu.Lock()
d.asyncRunning = false
d.asyncRunningMu.Unlock()
// Drain the currently decoding.
d.history.error = true
flushdone:
for {
select {
case b := <-d.decoding:
b.history <- &d.history
output <- <-b.result
default:
break flushdone
}
}
println("frame decoder done, signalling done")
d.frameDone.Done()
}()
// Get decoder for first block.
block := <-d.decoding
block.history <- &d.history
for {
var next *blockDec
// Get result
r := <-block.result
if r.err != nil {
println("Result contained error", r.err)
output <- r
return
}
if debugDecoder {
println("got result, from ", d.offset, "to", d.offset+int64(len(r.b)))
d.offset += int64(len(r.b))
}
if !block.Last {
// Send history to next block
select {
case next = <-d.decoding:
if debugDecoder {
println("Sending ", len(d.history.b), "bytes as history")
}
next.history <- &d.history
default:
// Wait until we have sent the block, so
// other decoders can potentially get the decoder.
next = nil
}
}
// Add checksum, async to decoding.
if d.HasCheckSum {
n, err := d.crc.Write(r.b)
if err != nil {
r.err = err
if n != len(r.b) {
r.err = io.ErrShortWrite
}
output <- r
return
}
}
written += int64(len(r.b))
if d.SingleSegment && uint64(written) > d.FrameContentSize {
println("runDecoder: single segment and", uint64(written), ">", d.FrameContentSize)
r.err = ErrFrameSizeExceeded
output <- r
return
}
if block.Last {
r.err = d.checkCRC()
output <- r
return
}
output <- r
if next == nil {
// There was no decoder available, we wait for one now that we have sent to the writer.
if debugDecoder {
println("Sending ", len(d.history.b), " bytes as history")
}
next = <-d.decoding
next.history <- &d.history
}
block = next
}
}
// runDecoder will create a sync decoder that will decode a block of data.
func (d *frameDec) runDecoder(dst []byte, dec *blockDec) ([]byte, error) {
saved := d.history.b
// We use the history for output to avoid copying it.
d.history.b = dst
d.history.ignoreBuffer = len(dst)
// Store input length, so we only check new data.
crcStart := len(dst)
var err error
@ -489,7 +336,7 @@ func (d *frameDec) runDecoder(dst []byte, dec *blockDec) ([]byte, error) {
println("next block:", dec)
}
err = dec.decodeBuf(&d.history)
if err != nil || dec.Last {
if err != nil {
break
}
if uint64(len(d.history.b)) > d.o.maxDecodedSize {
@ -501,10 +348,23 @@ func (d *frameDec) runDecoder(dst []byte, dec *blockDec) ([]byte, error) {
err = ErrFrameSizeExceeded
break
}
if d.FrameContentSize > 0 && uint64(len(d.history.b)-crcStart) > d.FrameContentSize {
println("runDecoder: FrameContentSize exceeded", uint64(len(d.history.b)-crcStart), ">", d.FrameContentSize)
err = ErrFrameSizeExceeded
break
}
if dec.Last {
break
}
if debugDecoder && d.FrameContentSize > 0 {
println("runDecoder: FrameContentSize", uint64(len(d.history.b)-crcStart), "<=", d.FrameContentSize)
}
}
dst = d.history.b
if err == nil {
if d.HasCheckSum {
if d.FrameContentSize > 0 && uint64(len(d.history.b)-crcStart) != d.FrameContentSize {
err = ErrFrameSizeMismatch
} else if d.HasCheckSum {
var n int
n, err = d.crc.Write(dst[crcStart:])
if err == nil {

11
vendor/github.com/klauspost/compress/zstd/fuzz.go generated vendored Normal file
View File

@ -0,0 +1,11 @@
//go:build gofuzz
// +build gofuzz
// Copyright 2019+ Klaus Post. All rights reserved.
// License information can be found in the LICENSE file.
// Based on work by Yann Collet, released under BSD License.
package zstd
// ignoreCRC can be used for fuzz testing to ignore CRC values...
const ignoreCRC = true

11
vendor/github.com/klauspost/compress/zstd/fuzz_none.go generated vendored Normal file
View File

@ -0,0 +1,11 @@
//go:build !gofuzz
// +build !gofuzz
// Copyright 2019+ Klaus Post. All rights reserved.
// License information can be found in the LICENSE file.
// Based on work by Yann Collet, released under BSD License.
package zstd
// ignoreCRC can be used for fuzz testing to ignore CRC values...
const ignoreCRC = false

46
vendor/github.com/klauspost/compress/zstd/history.go generated vendored
View File

@ -10,20 +10,31 @@ import (
// history contains the information transferred between blocks.
type history struct {
b []byte
huffTree *huff0.Scratch
recentOffsets [3]int
// Literal decompression
huffTree *huff0.Scratch
// Sequence decompression
decoders sequenceDecs
windowSize int
maxSize int
error bool
dict *dict
recentOffsets [3]int
// History buffer...
b []byte
// ignoreBuffer is meant to ignore a number of bytes
// when checking for matches in history
ignoreBuffer int
windowSize int
allocFrameBuffer int // needed?
error bool
dict *dict
}
// reset will reset the history to initial state of a frame.
// The history must already have been initialized to the desired size.
func (h *history) reset() {
h.b = h.b[:0]
h.ignoreBuffer = 0
h.error = false
h.recentOffsets = [3]int{1, 4, 8}
if f := h.decoders.litLengths.fse; f != nil && !f.preDefined {
@ -35,7 +46,7 @@ func (h *history) reset() {
if f := h.decoders.matchLengths.fse; f != nil && !f.preDefined {
fseDecoderPool.Put(f)
}
h.decoders = sequenceDecs{}
h.decoders = sequenceDecs{br: h.decoders.br}
if h.huffTree != nil {
if h.dict == nil || h.dict.litEnc != h.huffTree {
huffDecoderPool.Put(h.huffTree)
@ -54,6 +65,7 @@ func (h *history) setDict(dict *dict) {
h.decoders.litLengths = dict.llDec
h.decoders.offsets = dict.ofDec
h.decoders.matchLengths = dict.mlDec
h.decoders.dict = dict.content
h.recentOffsets = dict.offsets
h.huffTree = dict.litEnc
}
@ -83,6 +95,24 @@ func (h *history) append(b []byte) {
copy(h.b[h.windowSize-len(b):], b)
}
// ensureBlock will ensure there is space for at least one block...
func (h *history) ensureBlock() {
if cap(h.b) < h.allocFrameBuffer {
h.b = make([]byte, 0, h.allocFrameBuffer)
return
}
avail := cap(h.b) - len(h.b)
if avail >= h.windowSize || avail > maxCompressedBlockSize {
return
}
// Move data down so we only have window size left.
// We know we have less than window size in b at this point.
discard := len(h.b) - h.windowSize
copy(h.b, h.b[discard:])
h.b = h.b[:h.windowSize]
}
// append bytes to history without ever discarding anything.
func (h *history) appendKeep(b []byte) {
h.b = append(h.b, b...)

335
vendor/github.com/klauspost/compress/zstd/seqdec.go generated vendored
View File

@ -20,6 +20,10 @@ type seq struct {
llCode, mlCode, ofCode uint8
}
type seqVals struct {
ll, ml, mo int
}
func (s seq) String() string {
if s.offset <= 3 {
if s.offset == 0 {
@ -61,16 +65,18 @@ type sequenceDecs struct {
offsets sequenceDec
matchLengths sequenceDec
prevOffset [3]int
hist []byte
dict []byte
literals []byte
out []byte
nSeqs int
br *bitReader
seqSize int
windowSize int
maxBits uint8
}
// initialize all 3 decoders from the stream input.
func (s *sequenceDecs) initialize(br *bitReader, hist *history, literals, out []byte) error {
func (s *sequenceDecs) initialize(br *bitReader, hist *history, out []byte) error {
if err := s.litLengths.init(br); err != nil {
return errors.New("litLengths:" + err.Error())
}
@ -80,8 +86,7 @@ func (s *sequenceDecs) initialize(br *bitReader, hist *history, literals, out []
if err := s.matchLengths.init(br); err != nil {
return errors.New("matchLengths:" + err.Error())
}
s.literals = literals
s.hist = hist.b
s.br = br
s.prevOffset = hist.recentOffsets
s.maxBits = s.litLengths.fse.maxBits + s.offsets.fse.maxBits + s.matchLengths.fse.maxBits
s.windowSize = hist.windowSize
@ -94,11 +99,254 @@ func (s *sequenceDecs) initialize(br *bitReader, hist *history, literals, out []
}
// decode sequences from the stream with the provided history.
func (s *sequenceDecs) decode(seqs int, br *bitReader, hist []byte) error {
func (s *sequenceDecs) decode(seqs []seqVals) error {
br := s.br
// Grab full sizes tables, to avoid bounds checks.
llTable, mlTable, ofTable := s.litLengths.fse.dt[:maxTablesize], s.matchLengths.fse.dt[:maxTablesize], s.offsets.fse.dt[:maxTablesize]
llState, mlState, ofState := s.litLengths.state.state, s.matchLengths.state.state, s.offsets.state.state
s.seqSize = 0
litRemain := len(s.literals)
for i := range seqs {
var ll, mo, ml int
if br.off > 4+((maxOffsetBits+16+16)>>3) {
// inlined function:
// ll, mo, ml = s.nextFast(br, llState, mlState, ofState)
// Final will not read from stream.
var llB, mlB, moB uint8
ll, llB = llState.final()
ml, mlB = mlState.final()
mo, moB = ofState.final()
// extra bits are stored in reverse order.
br.fillFast()
mo += br.getBits(moB)
if s.maxBits > 32 {
br.fillFast()
}
ml += br.getBits(mlB)
ll += br.getBits(llB)
if moB > 1 {
s.prevOffset[2] = s.prevOffset[1]
s.prevOffset[1] = s.prevOffset[0]
s.prevOffset[0] = mo
} else {
// mo = s.adjustOffset(mo, ll, moB)
// Inlined for rather big speedup
if ll == 0 {
// There is an exception though, when current sequence's literals_length = 0.
// In this case, repeated offsets are shifted by one, so an offset_value of 1 means Repeated_Offset2,
// an offset_value of 2 means Repeated_Offset3, and an offset_value of 3 means Repeated_Offset1 - 1_byte.
mo++
}
if mo == 0 {
mo = s.prevOffset[0]
} else {
var temp int
if mo == 3 {
temp = s.prevOffset[0] - 1
} else {
temp = s.prevOffset[mo]
}
if temp == 0 {
// 0 is not valid; input is corrupted; force offset to 1
println("WARNING: temp was 0")
temp = 1
}
if mo != 1 {
s.prevOffset[2] = s.prevOffset[1]
}
s.prevOffset[1] = s.prevOffset[0]
s.prevOffset[0] = temp
mo = temp
}
}
br.fillFast()
} else {
if br.overread() {
if debugDecoder {
printf("reading sequence %d, exceeded available data\n", i)
}
return io.ErrUnexpectedEOF
}
ll, mo, ml = s.next(br, llState, mlState, ofState)
br.fill()
}
if debugSequences {
println("Seq", i, "Litlen:", ll, "mo:", mo, "(abs) ml:", ml)
}
// Evaluate.
// We might be doing this async, so do it early.
if mo == 0 && ml > 0 {
return fmt.Errorf("zero matchoff and matchlen (%d) > 0", ml)
}
if ml > maxMatchLen {
return fmt.Errorf("match len (%d) bigger than max allowed length", ml)
}
s.seqSize += ll + ml
if s.seqSize > maxBlockSize {
return fmt.Errorf("output (%d) bigger than max block size", s.seqSize)
}
litRemain -= ll
if litRemain < 0 {
return fmt.Errorf("unexpected literal count, want %d bytes, but only %d is available", ll, litRemain+ll)
}
seqs[i] = seqVals{
ll: ll,
ml: ml,
mo: mo,
}
if i == len(seqs)-1 {
// This is the last sequence, so we shouldn't update state.
break
}
// Manually inlined, ~ 5-20% faster
// Update all 3 states at once. Approx 20% faster.
nBits := llState.nbBits() + mlState.nbBits() + ofState.nbBits()
if nBits == 0 {
llState = llTable[llState.newState()&maxTableMask]
mlState = mlTable[mlState.newState()&maxTableMask]
ofState = ofTable[ofState.newState()&maxTableMask]
} else {
bits := br.get32BitsFast(nBits)
lowBits := uint16(bits >> ((ofState.nbBits() + mlState.nbBits()) & 31))
llState = llTable[(llState.newState()+lowBits)&maxTableMask]
lowBits = uint16(bits >> (ofState.nbBits() & 31))
lowBits &= bitMask[mlState.nbBits()&15]
mlState = mlTable[(mlState.newState()+lowBits)&maxTableMask]
lowBits = uint16(bits) & bitMask[ofState.nbBits()&15]
ofState = ofTable[(ofState.newState()+lowBits)&maxTableMask]
}
}
s.seqSize += litRemain
if s.seqSize > maxBlockSize {
return fmt.Errorf("output (%d) bigger than max block size", s.seqSize)
}
err := br.close()
if err != nil {
printf("Closing sequences: %v, %+v\n", err, *br)
}
return err
}
// execute will execute the decoded sequence with the provided history.
// The sequence must be evaluated before being sent.
func (s *sequenceDecs) execute(seqs []seqVals, hist []byte) error {
// Ensure we have enough output size...
if len(s.out)+s.seqSize > cap(s.out) {
addBytes := s.seqSize + len(s.out)
s.out = append(s.out, make([]byte, addBytes)...)
s.out = s.out[:len(s.out)-addBytes]
}
if debugDecoder {
printf("Execute %d seqs with hist %d, dict %d, literals: %d into %d bytes\n", len(seqs), len(hist), len(s.dict), len(s.literals), s.seqSize)
}
var t = len(s.out)
out := s.out[:t+s.seqSize]
for _, seq := range seqs {
// Add literals
copy(out[t:], s.literals[:seq.ll])
t += seq.ll
s.literals = s.literals[seq.ll:]
// Copy from dictionary...
if seq.mo > t+len(hist) || seq.mo > s.windowSize {
if len(s.dict) == 0 {
return fmt.Errorf("match offset (%d) bigger than current history (%d)", seq.mo, t+len(hist))
}
// we may be in dictionary.
dictO := len(s.dict) - (seq.mo - (t + len(hist)))
if dictO < 0 || dictO >= len(s.dict) {
return fmt.Errorf("match offset (%d) bigger than current history+dict (%d)", seq.mo, t+len(hist)+len(s.dict))
}
end := dictO + seq.ml
if end > len(s.dict) {
n := len(s.dict) - dictO
copy(out[t:], s.dict[dictO:])
t += n
seq.ml -= n
} else {
copy(out[t:], s.dict[dictO:end])
t += end - dictO
continue
}
}
// Copy from history.
if v := seq.mo - t; v > 0 {
// v is the start position in history from end.
start := len(hist) - v
if seq.ml > v {
// Some goes into current block.
// Copy remainder of history
copy(out[t:], hist[start:])
t += v
seq.ml -= v
} else {
copy(out[t:], hist[start:start+seq.ml])
t += seq.ml
continue
}
}
// We must be in current buffer now
if seq.ml > 0 {
start := t - seq.mo
if seq.ml <= t-start {
// No overlap
copy(out[t:], out[start:start+seq.ml])
t += seq.ml
continue
} else {
// Overlapping copy
// Extend destination slice and copy one byte at the time.
src := out[start : start+seq.ml]
dst := out[t:]
dst = dst[:len(src)]
t += len(src)
// Destination is the space we just added.
for i := range src {
dst[i] = src[i]
}
}
}
}
// Add final literals
copy(out[t:], s.literals)
if debugDecoder {
t += len(s.literals)
if t != len(out) {
panic(fmt.Errorf("length mismatch, want %d, got %d, ss: %d", len(out), t, s.seqSize))
}
}
s.out = out
return nil
}
// decode sequences from the stream with the provided history.
func (s *sequenceDecs) decodeSync(history *history) error {
br := s.br
seqs := s.nSeqs
startSize := len(s.out)
// Grab full sizes tables, to avoid bounds checks.
llTable, mlTable, ofTable := s.litLengths.fse.dt[:maxTablesize], s.matchLengths.fse.dt[:maxTablesize], s.offsets.fse.dt[:maxTablesize]
llState, mlState, ofState := s.litLengths.state.state, s.matchLengths.state.state, s.offsets.state.state
hist := history.b[history.ignoreBuffer:]
out := s.out
for i := seqs - 1; i >= 0; i-- {
if br.overread() {
@ -151,7 +399,7 @@ func (s *sequenceDecs) decode(seqs int, br *bitReader, hist []byte) error {
if temp == 0 {
// 0 is not valid; input is corrupted; force offset to 1
println("temp was 0")
println("WARNING: temp was 0")
temp = 1
}
@ -176,51 +424,49 @@ func (s *sequenceDecs) decode(seqs int, br *bitReader, hist []byte) error {
if ll > len(s.literals) {
return fmt.Errorf("unexpected literal count, want %d bytes, but only %d is available", ll, len(s.literals))
}
size := ll + ml + len(s.out)
size := ll + ml + len(out)
if size-startSize > maxBlockSize {
return fmt.Errorf("output (%d) bigger than max block size", size)
}
if size > cap(s.out) {
if size > cap(out) {
// Not enough size, which can happen under high volume block streaming conditions
// but could be if destination slice is too small for sync operations.
// over-allocating here can create a large amount of GC pressure so we try to keep
// it as contained as possible
used := len(s.out) - startSize
used := len(out) - startSize
addBytes := 256 + ll + ml + used>>2
// Clamp to max block size.
if used+addBytes > maxBlockSize {
addBytes = maxBlockSize - used
}
s.out = append(s.out, make([]byte, addBytes)...)
s.out = s.out[:len(s.out)-addBytes]
out = append(out, make([]byte, addBytes)...)
out = out[:len(out)-addBytes]
}
if ml > maxMatchLen {
return fmt.Errorf("match len (%d) bigger than max allowed length", ml)
}
// Add literals
s.out = append(s.out, s.literals[:ll]...)
out = append(out, s.literals[:ll]...)
s.literals = s.literals[ll:]
out := s.out
if mo == 0 && ml > 0 {
return fmt.Errorf("zero matchoff and matchlen (%d) > 0", ml)
}
if mo > len(s.out)+len(hist) || mo > s.windowSize {
if mo > len(out)+len(hist) || mo > s.windowSize {
if len(s.dict) == 0 {
return fmt.Errorf("match offset (%d) bigger than current history (%d)", mo, len(s.out)+len(hist))
return fmt.Errorf("match offset (%d) bigger than current history (%d)", mo, len(out)+len(hist))
}
// we may be in dictionary.
dictO := len(s.dict) - (mo - (len(s.out) + len(hist)))
dictO := len(s.dict) - (mo - (len(out) + len(hist)))
if dictO < 0 || dictO >= len(s.dict) {
return fmt.Errorf("match offset (%d) bigger than current history (%d)", mo, len(s.out)+len(hist))
return fmt.Errorf("match offset (%d) bigger than current history (%d)", mo, len(out)+len(hist))
}
end := dictO + ml
if end > len(s.dict) {
out = append(out, s.dict[dictO:]...)
mo -= len(s.dict) - dictO
ml -= len(s.dict) - dictO
} else {
out = append(out, s.dict[dictO:end]...)
@ -231,26 +477,25 @@ func (s *sequenceDecs) decode(seqs int, br *bitReader, hist []byte) error {
// Copy from history.
// TODO: Blocks without history could be made to ignore this completely.
if v := mo - len(s.out); v > 0 {
if v := mo - len(out); v > 0 {
// v is the start position in history from end.
start := len(s.hist) - v
start := len(hist) - v
if ml > v {
// Some goes into current block.
// Copy remainder of history
out = append(out, s.hist[start:]...)
mo -= v
out = append(out, hist[start:]...)
ml -= v
} else {
out = append(out, s.hist[start:start+ml]...)
out = append(out, hist[start:start+ml]...)
ml = 0
}
}
// We must be in current buffer now
if ml > 0 {
start := len(s.out) - mo
if ml <= len(s.out)-start {
start := len(out) - mo
if ml <= len(out)-start {
// No overlap
out = append(out, s.out[start:start+ml]...)
out = append(out, out[start:start+ml]...)
} else {
// Overlapping copy
// Extend destination slice and copy one byte at the time.
@ -264,7 +509,6 @@ func (s *sequenceDecs) decode(seqs int, br *bitReader, hist []byte) error {
}
}
}
s.out = out
if i == 0 {
// This is the last sequence, so we shouldn't update state.
break
@ -292,8 +536,8 @@ func (s *sequenceDecs) decode(seqs int, br *bitReader, hist []byte) error {
}
// Add final literals
s.out = append(s.out, s.literals...)
return nil
s.out = append(out, s.literals...)
return br.close()
}
// update states, at least 27 bits must be available.
@ -457,36 +701,3 @@ func (s *sequenceDecs) adjustOffset(offset, litLen int, offsetB uint8) int {
s.prevOffset[0] = temp
return temp
}
// mergeHistory will merge history.
func (s *sequenceDecs) mergeHistory(hist *sequenceDecs) (*sequenceDecs, error) {
for i := uint(0); i < 3; i++ {
var sNew, sHist *sequenceDec
switch i {
default:
// same as "case 0":
sNew = &s.litLengths
sHist = &hist.litLengths
case 1:
sNew = &s.offsets
sHist = &hist.offsets
case 2:
sNew = &s.matchLengths
sHist = &hist.matchLengths
}
if sNew.repeat {
if sHist.fse == nil {
return nil, fmt.Errorf("sequence stream %d, repeat requested, but no history", i)
}
continue
}
if sNew.fse == nil {
return nil, fmt.Errorf("sequence stream %d, no fse found", i)
}
if sHist.fse != nil && !sHist.fse.preDefined {
fseDecoderPool.Put(sHist.fse)
}
sHist.fse = sNew.fse
}
return hist, nil
}

4
vendor/github.com/klauspost/compress/zstd/zstd.go generated vendored
View File

@ -75,6 +75,10 @@ var (
// This is only returned if SingleSegment is specified on the frame.
ErrFrameSizeExceeded = errors.New("frame size exceeded")
// ErrFrameSizeMismatch is returned if the stated frame size does not match the expected size.
// This is only returned if SingleSegment is specified on the frame.
ErrFrameSizeMismatch = errors.New("frame size does not match size on stream")
// ErrCRCMismatch is returned if CRC mismatches.
ErrCRCMismatch = errors.New("CRC check failed")

2
vendor/modules.txt vendored
View File

@ -138,7 +138,7 @@ github.com/gorilla/mux
github.com/imdario/mergo
# github.com/inconshreveable/mousetrap v1.0.0
github.com/inconshreveable/mousetrap
# github.com/klauspost/compress v1.14.3
# github.com/klauspost/compress v1.15.0
## explicit
github.com/klauspost/compress
github.com/klauspost/compress/fse