mirror of
https://github.com/go-gitea/gitea.git
synced 2024-12-04 14:46:57 -05:00
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>
306 lines
7.1 KiB
Go
Vendored
306 lines
7.1 KiB
Go
Vendored
// Copyright 2014-2019 Ulrich Kunitz. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package lzma
|
|
|
|
import (
|
|
"bytes"
|
|
"errors"
|
|
"io"
|
|
)
|
|
|
|
// Writer2Config is used to create a Writer2 using parameters.
|
|
type Writer2Config struct {
|
|
// The properties for the encoding. If the it is nil the value
|
|
// {LC: 3, LP: 0, PB: 2} will be chosen.
|
|
Properties *Properties
|
|
// The capacity of the dictionary. If DictCap is zero, the value
|
|
// 8 MiB will be chosen.
|
|
DictCap int
|
|
// Size of the lookahead buffer; value 0 indicates default size
|
|
// 4096
|
|
BufSize int
|
|
// Match algorithm
|
|
Matcher MatchAlgorithm
|
|
}
|
|
|
|
// fill replaces zero values with default values.
|
|
func (c *Writer2Config) fill() {
|
|
if c.Properties == nil {
|
|
c.Properties = &Properties{LC: 3, LP: 0, PB: 2}
|
|
}
|
|
if c.DictCap == 0 {
|
|
c.DictCap = 8 * 1024 * 1024
|
|
}
|
|
if c.BufSize == 0 {
|
|
c.BufSize = 4096
|
|
}
|
|
}
|
|
|
|
// Verify checks the Writer2Config for correctness. Zero values will be
|
|
// replaced by default values.
|
|
func (c *Writer2Config) Verify() error {
|
|
c.fill()
|
|
var err error
|
|
if c == nil {
|
|
return errors.New("lzma: WriterConfig is nil")
|
|
}
|
|
if c.Properties == nil {
|
|
return errors.New("lzma: WriterConfig has no Properties set")
|
|
}
|
|
if err = c.Properties.verify(); err != nil {
|
|
return err
|
|
}
|
|
if !(MinDictCap <= c.DictCap && int64(c.DictCap) <= MaxDictCap) {
|
|
return errors.New("lzma: dictionary capacity is out of range")
|
|
}
|
|
if !(maxMatchLen <= c.BufSize) {
|
|
return errors.New("lzma: lookahead buffer size too small")
|
|
}
|
|
if c.Properties.LC+c.Properties.LP > 4 {
|
|
return errors.New("lzma: sum of lc and lp exceeds 4")
|
|
}
|
|
if err = c.Matcher.verify(); err != nil {
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Writer2 supports the creation of an LZMA2 stream. But note that
|
|
// written data is buffered, so call Flush or Close to write data to the
|
|
// underlying writer. The Close method writes the end-of-stream marker
|
|
// to the stream. So you may be able to concatenate the output of two
|
|
// writers as long the output of the first writer has only been flushed
|
|
// but not closed.
|
|
//
|
|
// Any change to the fields Properties, DictCap must be done before the
|
|
// first call to Write, Flush or Close.
|
|
type Writer2 struct {
|
|
w io.Writer
|
|
|
|
start *state
|
|
encoder *encoder
|
|
|
|
cstate chunkState
|
|
ctype chunkType
|
|
|
|
buf bytes.Buffer
|
|
lbw LimitedByteWriter
|
|
}
|
|
|
|
// NewWriter2 creates an LZMA2 chunk sequence writer with the default
|
|
// parameters and options.
|
|
func NewWriter2(lzma2 io.Writer) (w *Writer2, err error) {
|
|
return Writer2Config{}.NewWriter2(lzma2)
|
|
}
|
|
|
|
// NewWriter2 creates a new LZMA2 writer using the given configuration.
|
|
func (c Writer2Config) NewWriter2(lzma2 io.Writer) (w *Writer2, err error) {
|
|
if err = c.Verify(); err != nil {
|
|
return nil, err
|
|
}
|
|
w = &Writer2{
|
|
w: lzma2,
|
|
start: newState(*c.Properties),
|
|
cstate: start,
|
|
ctype: start.defaultChunkType(),
|
|
}
|
|
w.buf.Grow(maxCompressed)
|
|
w.lbw = LimitedByteWriter{BW: &w.buf, N: maxCompressed}
|
|
m, err := c.Matcher.new(c.DictCap)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
d, err := newEncoderDict(c.DictCap, c.BufSize, m)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
w.encoder, err = newEncoder(&w.lbw, cloneState(w.start), d, 0)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return w, nil
|
|
}
|
|
|
|
// written returns the number of bytes written to the current chunk
|
|
func (w *Writer2) written() int {
|
|
if w.encoder == nil {
|
|
return 0
|
|
}
|
|
return int(w.encoder.Compressed()) + w.encoder.dict.Buffered()
|
|
}
|
|
|
|
// errClosed indicates that the writer is closed.
|
|
var errClosed = errors.New("lzma: writer closed")
|
|
|
|
// Writes data to LZMA2 stream. Note that written data will be buffered.
|
|
// Use Flush or Close to ensure that data is written to the underlying
|
|
// writer.
|
|
func (w *Writer2) Write(p []byte) (n int, err error) {
|
|
if w.cstate == stop {
|
|
return 0, errClosed
|
|
}
|
|
for n < len(p) {
|
|
m := maxUncompressed - w.written()
|
|
if m <= 0 {
|
|
panic("lzma: maxUncompressed reached")
|
|
}
|
|
var q []byte
|
|
if n+m < len(p) {
|
|
q = p[n : n+m]
|
|
} else {
|
|
q = p[n:]
|
|
}
|
|
k, err := w.encoder.Write(q)
|
|
n += k
|
|
if err != nil && err != ErrLimit {
|
|
return n, err
|
|
}
|
|
if err == ErrLimit || k == m {
|
|
if err = w.flushChunk(); err != nil {
|
|
return n, err
|
|
}
|
|
}
|
|
}
|
|
return n, nil
|
|
}
|
|
|
|
// writeUncompressedChunk writes an uncompressed chunk to the LZMA2
|
|
// stream.
|
|
func (w *Writer2) writeUncompressedChunk() error {
|
|
u := w.encoder.Compressed()
|
|
if u <= 0 {
|
|
return errors.New("lzma: can't write empty uncompressed chunk")
|
|
}
|
|
if u > maxUncompressed {
|
|
panic("overrun of uncompressed data limit")
|
|
}
|
|
switch w.ctype {
|
|
case cLRND:
|
|
w.ctype = cUD
|
|
default:
|
|
w.ctype = cU
|
|
}
|
|
w.encoder.state = w.start
|
|
|
|
header := chunkHeader{
|
|
ctype: w.ctype,
|
|
uncompressed: uint32(u - 1),
|
|
}
|
|
hdata, err := header.MarshalBinary()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if _, err = w.w.Write(hdata); err != nil {
|
|
return err
|
|
}
|
|
_, err = w.encoder.dict.CopyN(w.w, int(u))
|
|
return err
|
|
}
|
|
|
|
// writeCompressedChunk writes a compressed chunk to the underlying
|
|
// writer.
|
|
func (w *Writer2) writeCompressedChunk() error {
|
|
if w.ctype == cU || w.ctype == cUD {
|
|
panic("chunk type uncompressed")
|
|
}
|
|
|
|
u := w.encoder.Compressed()
|
|
if u <= 0 {
|
|
return errors.New("writeCompressedChunk: empty chunk")
|
|
}
|
|
if u > maxUncompressed {
|
|
panic("overrun of uncompressed data limit")
|
|
}
|
|
c := w.buf.Len()
|
|
if c <= 0 {
|
|
panic("no compressed data")
|
|
}
|
|
if c > maxCompressed {
|
|
panic("overrun of compressed data limit")
|
|
}
|
|
header := chunkHeader{
|
|
ctype: w.ctype,
|
|
uncompressed: uint32(u - 1),
|
|
compressed: uint16(c - 1),
|
|
props: w.encoder.state.Properties,
|
|
}
|
|
hdata, err := header.MarshalBinary()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if _, err = w.w.Write(hdata); err != nil {
|
|
return err
|
|
}
|
|
_, err = io.Copy(w.w, &w.buf)
|
|
return err
|
|
}
|
|
|
|
// writes a single chunk to the underlying writer.
|
|
func (w *Writer2) writeChunk() error {
|
|
u := int(uncompressedHeaderLen + w.encoder.Compressed())
|
|
c := headerLen(w.ctype) + w.buf.Len()
|
|
if u < c {
|
|
return w.writeUncompressedChunk()
|
|
}
|
|
return w.writeCompressedChunk()
|
|
}
|
|
|
|
// flushChunk terminates the current chunk. The encoder will be reset
|
|
// to support the next chunk.
|
|
func (w *Writer2) flushChunk() error {
|
|
if w.written() == 0 {
|
|
return nil
|
|
}
|
|
var err error
|
|
if err = w.encoder.Close(); err != nil {
|
|
return err
|
|
}
|
|
if err = w.writeChunk(); err != nil {
|
|
return err
|
|
}
|
|
w.buf.Reset()
|
|
w.lbw.N = maxCompressed
|
|
if err = w.encoder.Reopen(&w.lbw); err != nil {
|
|
return err
|
|
}
|
|
if err = w.cstate.next(w.ctype); err != nil {
|
|
return err
|
|
}
|
|
w.ctype = w.cstate.defaultChunkType()
|
|
w.start = cloneState(w.encoder.state)
|
|
return nil
|
|
}
|
|
|
|
// Flush writes all buffered data out to the underlying stream. This
|
|
// could result in multiple chunks to be created.
|
|
func (w *Writer2) Flush() error {
|
|
if w.cstate == stop {
|
|
return errClosed
|
|
}
|
|
for w.written() > 0 {
|
|
if err := w.flushChunk(); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Close terminates the LZMA2 stream with an EOS chunk.
|
|
func (w *Writer2) Close() error {
|
|
if w.cstate == stop {
|
|
return errClosed
|
|
}
|
|
if err := w.Flush(); err != nil {
|
|
return nil
|
|
}
|
|
// write zero byte EOS chunk
|
|
_, err := w.w.Write([]byte{0})
|
|
if err != nil {
|
|
return err
|
|
}
|
|
w.cstate = stop
|
|
return nil
|
|
}
|