支持ZSTD压缩

internal/compressions/writer_zstd.go

@@ -0,0 +1,57 @@
+// Copyright 2021 Liuxiangchao iwind.liu@gmail.com. All rights reserved.
+
+package compressions
+
+import (
+	"github.com/klauspost/compress/zstd"
+	"io"
+)
+
+type ZSTDWriter struct {
+	BaseWriter
+
+	writer *zstd.Encoder
+	level  int
+}
+
+func NewZSTDWriter(writer io.Writer, level int) (Writer, error) {
+	return sharedZSTDWriterPool.Get(writer, level)
+}
+
+func newZSTDWriter(writer io.Writer, level int) (Writer, error) {
+	var zstdLevel = zstd.EncoderLevelFromZstd(level)
+
+	zstdWriter, err := zstd.NewWriter(writer, zstd.WithEncoderLevel(zstdLevel))
+	if err != nil {
+		return nil, err
+	}
+
+	return &ZSTDWriter{
+		writer: zstdWriter,
+		level:  level,
+	}, nil
+}
+
+func (this *ZSTDWriter) Write(p []byte) (int, error) {
+	return this.writer.Write(p)
+}
+
+func (this *ZSTDWriter) Flush() error {
+	return this.writer.Flush()
+}
+
+func (this *ZSTDWriter) Reset(writer io.Writer) {
+	this.writer.Reset(writer)
+}
+
+func (this *ZSTDWriter) RawClose() error {
+	return this.writer.Close()
+}
+
+func (this *ZSTDWriter) Close() error {
+	return this.Finish(this)
+}
+
+func (this *ZSTDWriter) Level() int {
+	return this.level
+}