remove zstd

fix https://github.com/chrislusf/seaweedfs/issues/1629

weed/util/compression.go

@@ -9,7 +9,7 @@ import (
 	"strings"
 
 	"github.com/chrislusf/seaweedfs/weed/glog"
-	"github.com/klauspost/compress/zstd"
+	// "github.com/klauspost/compress/zstd"
 )
 
 var (
@@ -55,19 +55,16 @@ func GzipData(input []byte) ([]byte, error) {
 	return buf.Bytes(), nil
 }
 
-var zstdEncoder, _ = zstd.NewWriter(nil)
-
-func ZstdData(input []byte) ([]byte, error) {
-	return zstdEncoder.EncodeAll(input, nil), nil
-}
 
 func DecompressData(input []byte) ([]byte, error) {
 	if IsGzippedContent(input) {
 		return ungzipData(input)
 	}
+	/*
 	if IsZstdContent(input) {
 		return unzstdData(input)
 	}
+	*/
 	return input, UnsupportedCompression
 }
 
@@ -82,12 +79,6 @@ func ungzipData(input []byte) ([]byte, error) {
 	return output, err
 }
 
-var decoder, _ = zstd.NewReader(nil)
-
-func unzstdData(input []byte) ([]byte, error) {
-	return decoder.DecodeAll(input, nil)
-}
-
 func IsGzippedContent(data []byte) bool {
 	if len(data) < 2 {
 		return false
@@ -95,12 +86,26 @@ func IsGzippedContent(data []byte) bool {
 	return data[0] == 31 && data[1] == 139
 }
 
+/*
+var zstdEncoder, _ = zstd.NewWriter(nil)
+
+func ZstdData(input []byte) ([]byte, error) {
+	return zstdEncoder.EncodeAll(input, nil), nil
+}
+
+var decoder, _ = zstd.NewReader(nil)
+
+func unzstdData(input []byte) ([]byte, error) {
+	return decoder.DecodeAll(input, nil)
+}
+
 func IsZstdContent(data []byte) bool {
 	if len(data) < 4 {
 		return false
 	}
 	return data[3] == 0xFD && data[2] == 0x2F && data[1] == 0xB5 && data[0] == 0x28
 }
+*/
 
 /*
 * Default not to compressed since compression can be done on client side.