🐛 fix determine gbk

utils/file.go

@@ -1,12 +1,9 @@
 package utils
 
 import (
-	"bytes"
 	"encoding/json"
 	"github.com/Xhofe/alist/conf"
 	log "github.com/sirupsen/logrus"
-	"golang.org/x/text/encoding/simplifiedchinese"
-	"golang.org/x/text/transform"
 	"io/ioutil"
 	"os"
 	"path/filepath"
@@ -92,37 +89,3 @@ func ParsePath(path string) string {
 	return path
 }
 
-func IsGBK(data []byte) bool {
-	length := len(data)
-	var i int = 0
-	for i < length {
-		//fmt.Printf("for %x\n", data[i])
-		if data[i] <= 0xff {
-			//编码小于等于127,只有一个字节的编码，兼容ASCII吗
-			i++
-			continue
-		} else {
-			//大于127的使用双字节编码
-			if  data[i] >= 0x81 &&
-				data[i] <= 0xfe &&
-				data[i + 1] >= 0x40 &&
-				data[i + 1] <= 0xfe &&
-				data[i + 1] != 0xf7 {
-				i += 2
-				continue
-			} else {
-				return false
-			}
-		}
-	}
-	return true
-}
-
-func GbkToUtf8(s []byte) ([]byte, error) {
-	reader := transform.NewReader(bytes.NewReader(s), simplifiedchinese.GBK.NewDecoder())
-	d, e := ioutil.ReadAll(reader)
-	if e != nil {
-		return nil, e
-	}
-	return d, nil
-}