支持brotli和deflate压缩

internal/compressions/writer_brotli.go

@@ -0,0 +1,41 @@
+// Copyright 2021 Liuxiangchao iwind.liu@gmail.com. All rights reserved.
+
+package compressions
+
+import (
+	"github.com/andybalholm/brotli"
+	"io"
+)
+
+type BrotliWriter struct {
+	writer *brotli.Writer
+	level  int
+}
+
+func NewBrotliWriter(writer io.Writer, level int) (Writer, error) {
+	if level <= 0 {
+		level = brotli.BestSpeed
+	} else if level > brotli.BestCompression {
+		level = brotli.BestCompression
+	}
+	return &BrotliWriter{
+		writer: brotli.NewWriterLevel(writer, level),
+		level:  level,
+	}, nil
+}
+
+func (this *BrotliWriter) Write(p []byte) (int, error) {
+	return this.writer.Write(p)
+}
+
+func (this *BrotliWriter) Flush() error {
+	return this.writer.Flush()
+}
+
+func (this *BrotliWriter) Close() error {
+	return this.writer.Close()
+}
+
+func (this *BrotliWriter) Level() int {
+	return this.level
+}