mirror of
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* 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>
118 lines
2.7 KiB
Go
Vendored
118 lines
2.7 KiB
Go
Vendored
// Copyright 2014-2019 Ulrich Kunitz. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package xz
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import (
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"errors"
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"fmt"
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"io"
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"github.com/ulikunitz/xz/lzma"
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)
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// LZMA filter constants.
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const (
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lzmaFilterID = 0x21
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lzmaFilterLen = 3
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)
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// lzmaFilter declares the LZMA2 filter information stored in an xz
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// block header.
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type lzmaFilter struct {
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dictCap int64
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}
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// String returns a representation of the LZMA filter.
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func (f lzmaFilter) String() string {
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return fmt.Sprintf("LZMA dict cap %#x", f.dictCap)
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}
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// id returns the ID for the LZMA2 filter.
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func (f lzmaFilter) id() uint64 { return lzmaFilterID }
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// MarshalBinary converts the lzmaFilter in its encoded representation.
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func (f lzmaFilter) MarshalBinary() (data []byte, err error) {
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c := lzma.EncodeDictCap(f.dictCap)
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return []byte{lzmaFilterID, 1, c}, nil
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}
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// UnmarshalBinary unmarshals the given data representation of the LZMA2
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// filter.
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func (f *lzmaFilter) UnmarshalBinary(data []byte) error {
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if len(data) != lzmaFilterLen {
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return errors.New("xz: data for LZMA2 filter has wrong length")
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}
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if data[0] != lzmaFilterID {
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return errors.New("xz: wrong LZMA2 filter id")
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}
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if data[1] != 1 {
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return errors.New("xz: wrong LZMA2 filter size")
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}
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dc, err := lzma.DecodeDictCap(data[2])
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if err != nil {
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return errors.New("xz: wrong LZMA2 dictionary size property")
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}
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f.dictCap = dc
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return nil
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}
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// reader creates a new reader for the LZMA2 filter.
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func (f lzmaFilter) reader(r io.Reader, c *ReaderConfig) (fr io.Reader,
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err error) {
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config := new(lzma.Reader2Config)
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if c != nil {
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config.DictCap = c.DictCap
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}
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dc := int(f.dictCap)
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if dc < 1 {
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return nil, errors.New("xz: LZMA2 filter parameter " +
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"dictionary capacity overflow")
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}
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if dc > config.DictCap {
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config.DictCap = dc
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}
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fr, err = config.NewReader2(r)
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if err != nil {
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return nil, err
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}
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return fr, nil
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}
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// writeCloser creates a io.WriteCloser for the LZMA2 filter.
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func (f lzmaFilter) writeCloser(w io.WriteCloser, c *WriterConfig,
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) (fw io.WriteCloser, err error) {
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config := new(lzma.Writer2Config)
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if c != nil {
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*config = lzma.Writer2Config{
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Properties: c.Properties,
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DictCap: c.DictCap,
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BufSize: c.BufSize,
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Matcher: c.Matcher,
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}
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}
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dc := int(f.dictCap)
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if dc < 1 {
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return nil, errors.New("xz: LZMA2 filter parameter " +
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"dictionary capacity overflow")
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}
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if dc > config.DictCap {
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config.DictCap = dc
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}
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fw, err = config.NewWriter2(w)
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if err != nil {
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return nil, err
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}
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return fw, nil
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}
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// last returns true, because an LZMA2 filter must be the last filter in
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// the filter list.
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func (f lzmaFilter) last() bool { return true }
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