mirror of
https://github.com/go-gitea/gitea.git
synced 2024-12-05 09:03:48 +08:00
12a1f914f4
* update github.com/alecthomas/chroma v0.8.0 -> v0.8.1 * github.com/blevesearch/bleve v1.0.10 -> v1.0.12 * editorconfig-core-go v2.1.1 -> v2.3.7 * github.com/gliderlabs/ssh v0.2.2 -> v0.3.1 * migrate editorconfig.ParseBytes to Parse * github.com/shurcooL/vfsgen to 0d455de96546 * github.com/go-git/go-git/v5 v5.1.0 -> v5.2.0 * github.com/google/uuid v1.1.1 -> v1.1.2 * github.com/huandu/xstrings v1.3.0 -> v1.3.2 * github.com/klauspost/compress v1.10.11 -> v1.11.1 * github.com/markbates/goth v1.61.2 -> v1.65.0 * github.com/mattn/go-sqlite3 v1.14.0 -> v1.14.4 * github.com/mholt/archiver v3.3.0 -> v3.3.2 * github.com/microcosm-cc/bluemonday 4f7140c49acb -> v1.0.4 * github.com/minio/minio-go v7.0.4 -> v7.0.5 * github.com/olivere/elastic v7.0.9 -> v7.0.20 * github.com/urfave/cli v1.20.0 -> v1.22.4 * github.com/prometheus/client_golang v1.1.0 -> v1.8.0 * github.com/xanzy/go-gitlab v0.37.0 -> v0.38.1 * mvdan.cc/xurls v2.1.0 -> v2.2.0 Co-authored-by: Lauris BH <lauris@nix.lv>
123 lines
2.8 KiB
Go
Vendored
123 lines
2.8 KiB
Go
Vendored
package zstd
|
|
|
|
import (
|
|
"bytes"
|
|
"encoding/binary"
|
|
"errors"
|
|
"fmt"
|
|
"io"
|
|
|
|
"github.com/klauspost/compress/huff0"
|
|
)
|
|
|
|
type dict struct {
|
|
id uint32
|
|
|
|
litEnc *huff0.Scratch
|
|
llDec, ofDec, mlDec sequenceDec
|
|
//llEnc, ofEnc, mlEnc []*fseEncoder
|
|
offsets [3]int
|
|
content []byte
|
|
}
|
|
|
|
var dictMagic = [4]byte{0x37, 0xa4, 0x30, 0xec}
|
|
|
|
// ID returns the dictionary id or 0 if d is nil.
|
|
func (d *dict) ID() uint32 {
|
|
if d == nil {
|
|
return 0
|
|
}
|
|
return d.id
|
|
}
|
|
|
|
// DictContentSize returns the dictionary content size or 0 if d is nil.
|
|
func (d *dict) DictContentSize() int {
|
|
if d == nil {
|
|
return 0
|
|
}
|
|
return len(d.content)
|
|
}
|
|
|
|
// Load a dictionary as described in
|
|
// https://github.com/facebook/zstd/blob/master/doc/zstd_compression_format.md#dictionary-format
|
|
func loadDict(b []byte) (*dict, error) {
|
|
// Check static field size.
|
|
if len(b) <= 8+(3*4) {
|
|
return nil, io.ErrUnexpectedEOF
|
|
}
|
|
d := dict{
|
|
llDec: sequenceDec{fse: &fseDecoder{}},
|
|
ofDec: sequenceDec{fse: &fseDecoder{}},
|
|
mlDec: sequenceDec{fse: &fseDecoder{}},
|
|
}
|
|
if !bytes.Equal(b[:4], dictMagic[:]) {
|
|
return nil, ErrMagicMismatch
|
|
}
|
|
d.id = binary.LittleEndian.Uint32(b[4:8])
|
|
if d.id == 0 {
|
|
return nil, errors.New("dictionaries cannot have ID 0")
|
|
}
|
|
|
|
// Read literal table
|
|
var err error
|
|
d.litEnc, b, err = huff0.ReadTable(b[8:], nil)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
d.litEnc.Reuse = huff0.ReusePolicyMust
|
|
|
|
br := byteReader{
|
|
b: b,
|
|
off: 0,
|
|
}
|
|
readDec := func(i tableIndex, dec *fseDecoder) error {
|
|
if err := dec.readNCount(&br, uint16(maxTableSymbol[i])); err != nil {
|
|
return err
|
|
}
|
|
if br.overread() {
|
|
return io.ErrUnexpectedEOF
|
|
}
|
|
err = dec.transform(symbolTableX[i])
|
|
if err != nil {
|
|
println("Transform table error:", err)
|
|
return err
|
|
}
|
|
if debug {
|
|
println("Read table ok", "symbolLen:", dec.symbolLen)
|
|
}
|
|
// Set decoders as predefined so they aren't reused.
|
|
dec.preDefined = true
|
|
return nil
|
|
}
|
|
|
|
if err := readDec(tableOffsets, d.ofDec.fse); err != nil {
|
|
return nil, err
|
|
}
|
|
if err := readDec(tableMatchLengths, d.mlDec.fse); err != nil {
|
|
return nil, err
|
|
}
|
|
if err := readDec(tableLiteralLengths, d.llDec.fse); err != nil {
|
|
return nil, err
|
|
}
|
|
if br.remain() < 12 {
|
|
return nil, io.ErrUnexpectedEOF
|
|
}
|
|
|
|
d.offsets[0] = int(br.Uint32())
|
|
br.advance(4)
|
|
d.offsets[1] = int(br.Uint32())
|
|
br.advance(4)
|
|
d.offsets[2] = int(br.Uint32())
|
|
br.advance(4)
|
|
if d.offsets[0] <= 0 || d.offsets[1] <= 0 || d.offsets[2] <= 0 {
|
|
return nil, errors.New("invalid offset in dictionary")
|
|
}
|
|
d.content = make([]byte, br.remain())
|
|
copy(d.content, br.unread())
|
|
if d.offsets[0] > len(d.content) || d.offsets[1] > len(d.content) || d.offsets[2] > len(d.content) {
|
|
return nil, fmt.Errorf("initial offset bigger than dictionary content size %d, offsets: %v", len(d.content), d.offsets)
|
|
}
|
|
|
|
return &d, nil
|
|
}
|