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// Copyright 2021 Northern.tech AS
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//go:build !nolzma
// +build !nolzma
package artifact
import (
"io"
"github.com/ulikunitz/xz"
"github.com/ulikunitz/xz/lzma"
)
type CompressorLzma struct {
}
func NewCompressorLzma() Compressor {
return &CompressorLzma{}
}
func (c *CompressorLzma) GetFileExtension() string {
return ".xz"
}
func (c *CompressorLzma) NewReader(r io.Reader) (io.ReadCloser, error) {
r, err := rc.NewReader(r)
if err != nil {
return nil, err
}
return io.NopCloser(r), err
}
const xzDictSize = 64 * (1 << 20) // 64 MiB - dict size for preset -9
var (
// Set write config as xz(1) -9
wc = xz.WriterConfig{
DictCap: xzDictSize,
CheckSum: xz.CRC64,
// xz(1): --lzma2 mf:
// The default depends on the preset: 0 uses hc3, 1–3 use hc4,
// and the rest use bt4.
// bt4 = BinaryTree with 4-byte hashing
Matcher: lzma.HashTable4,
// xz(1): --block-size [...]
// In multi-threaded mode [...] The default size is three times
// the LZMA2 dictionary size or 1 MiB, whichever is more.
BlockSize: 3 * xzDictSize,
}
rc = xz.ReaderConfig{DictCap: xzDictSize}
)
func (c *CompressorLzma) NewWriter(w io.Writer) (io.WriteCloser, error) {
return wc.NewWriter(w)
}
func init() {
RegisterCompressor("lzma", &CompressorLzma{})
}
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