forked from TencentCloud/tencentcloud-cls-sdk-go
/
zstd.go
52 lines (43 loc) · 1.33 KB
/
zstd.go
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package tencentcloud_cls_sdk_go
import (
"sync"
"github.com/klauspost/compress/zstd"
)
const CompressionLevelDefault = -1000
type ZstdEncoderParams struct {
Level int
}
type ZstdDecoderParams struct {
}
var zstdEncMap, zstdDecMap sync.Map
func getEncoder(params ZstdEncoderParams) *zstd.Encoder {
if ret, ok := zstdEncMap.Load(params); ok {
return ret.(*zstd.Encoder)
}
// It's possible to race and create multiple new writers.
// Only one will survive GC after use.
encoderLevel := zstd.SpeedDefault
if params.Level != CompressionLevelDefault {
encoderLevel = zstd.EncoderLevelFromZstd(params.Level)
}
zstdEnc, _ := zstd.NewWriter(nil, zstd.WithZeroFrames(true),
zstd.WithEncoderLevel(encoderLevel))
zstdEncMap.Store(params, zstdEnc)
return zstdEnc
}
func getDecoder(params ZstdDecoderParams) *zstd.Decoder {
if ret, ok := zstdDecMap.Load(params); ok {
return ret.(*zstd.Decoder)
}
// It's possible to race and create multiple new readers.
// Only one will survive GC after use.
zstdDec, _ := zstd.NewReader(nil)
zstdDecMap.Store(params, zstdDec)
return zstdDec
}
func ZSTDDecompress(params ZstdDecoderParams, dst, src []byte) ([]byte, error) {
return getDecoder(params).DecodeAll(src, dst)
}
func ZSTDCompress(params ZstdEncoderParams, dst, src []byte) ([]byte, error) {
return getEncoder(params).EncodeAll(src, dst), nil
}