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gzip_compressor.go
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/
gzip_compressor.go
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// (c) 2021, Ava Labs, Inc. All rights reserved.
// See the file LICENSE for licensing terms.
package compression
import (
"bytes"
"compress/gzip"
"io/ioutil"
"sync"
"github.com/ava-labs/avalanchego/utils"
)
// gzipCompressor implements Compressor
type gzipCompressor struct {
lock sync.Mutex
writeBuffer *bytes.Buffer
gzipWriter *gzip.Writer
bytesReader *bytes.Reader
gzipReader *gzip.Reader
}
// Compress [msg] and returns the compressed bytes.
func (g *gzipCompressor) Compress(msg []byte) ([]byte, error) {
g.lock.Lock()
defer g.lock.Unlock()
g.writeBuffer.Reset()
g.gzipWriter.Reset(g.writeBuffer)
if _, err := g.gzipWriter.Write(msg); err != nil {
return nil, err
}
if err := g.gzipWriter.Close(); err != nil {
return nil, err
}
compressed := g.writeBuffer.Bytes()
compressedCopy := utils.CopyBytes(compressed)
return compressedCopy, nil
}
// Decompress decompresses [msg].
func (g *gzipCompressor) Decompress(msg []byte) ([]byte, error) {
g.lock.Lock()
defer g.lock.Unlock()
g.bytesReader.Reset(msg)
if err := g.gzipReader.Reset(g.bytesReader); err != nil {
return nil, err
}
decompressed, err := ioutil.ReadAll(g.gzipReader)
if err != nil {
return nil, err
}
return decompressed, g.gzipReader.Close()
}
// NewGzipCompressor returns a new gzip Compressor that compresses
func NewGzipCompressor() Compressor {
var buf bytes.Buffer
return &gzipCompressor{
writeBuffer: &buf,
gzipWriter: gzip.NewWriter(&buf),
bytesReader: &bytes.Reader{},
gzipReader: &gzip.Reader{},
}
}