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zstd.go
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zstd.go
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package gfc
// This file provides compression functionality for gfc.
// Z-standard is the only supported algorithm.
import (
"bytes"
"github.com/klauspost/compress/zstd"
"github.com/pkg/errors"
)
func Compress(compressOption bool, raw Buffer) (Buffer, error) {
if compressOption {
return compressZstd(raw)
}
return raw, nil
}
func compressZstd(raw Buffer) (Buffer, error) {
var compressed Buffer = new(bytes.Buffer)
compressor, err := zstd.NewWriter(compressed)
if err != nil {
return nil, errors.Wrap(err, "new zstd compressor failed")
}
_, err = raw.WriteTo(compressor)
if err != nil {
return nil, errors.Wrap(err, "failed to compress with zstd")
}
defer func() {
if err = compressor.Close(); err != nil {
panic("failed to close zstd compressor: " + err.Error())
}
}()
return compressed, nil
}
func Decompress(decompressOption bool, raw Buffer) (Buffer, error) {
if decompressOption {
return decompressZstd(raw)
}
return raw, nil
}
func decompressZstd(compressed Buffer) (Buffer, error) {
var decompressed Buffer = new(bytes.Buffer)
decompressor, err := zstd.NewReader(compressed)
if err != nil {
return nil, errors.Wrap(err, "new zstd decoder failed")
}
defer decompressor.Close()
_, err = decompressed.ReadFrom(decompressor)
if err != nil {
return nil, errors.Wrap(err, "failed to decompress with zstd")
}
return decompressed, nil
}