new file manager

Added CasaOS own file manager, now you can browse, upload, download files from the system, even edit code online, preview photos and videos through it. It will appear in the first position of Apps.
Added CPU core count display and memory capacity display.

pkg/utils/file/block.go

@@ -3,11 +3,14 @@ package file
 import (
 	"crypto/md5"
 	"encoding/hex"
+	"io"
 	"math"
+	"os"
+	"strconv"
 )
 
 // Get info of block
-func GetBlockInfo(fileSize int) (blockSize int, length int) {
+func GetBlockInfo(fileSize int64) (blockSize int, length int) {
 	switch {
 	case fileSize <= 1<<28: //256M
 		blockSize = 1 << 17 //128kb
@@ -32,13 +35,47 @@ func GetBlockInfo(fileSize int) (blockSize int, length int) {
 }
 
 //get the hash of the data
-func GetHash(data []byte) string {
+func GetHashByContent(data []byte) string {
 	sum := md5.Sum(data)
 	return hex.EncodeToString(sum[:])
 }
 
+//get the hash of the data
+func GetHashByPath(path string) string {
+	pFile, err := os.Open(path)
+	if err != nil {
+		return ""
+	}
+	defer pFile.Close()
+	md5h := md5.New()
+	io.Copy(md5h, pFile)
+	return hex.EncodeToString(md5h.Sum(nil))
+}
+
 //Comparison data hash
 func ComparisonHash(data []byte, hash string) bool {
 	sum := md5.Sum(data)
 	return hex.EncodeToString(sum[:]) == hash
 }
+
+//get prefix byte length
+func PrefixLength(byteLength int) []byte {
+	lengthByte := []byte{'0', '0', '0', '0'}
+	bSize := strconv.Itoa(byteLength)
+	cha := 4 - len(bSize)
+	for i := len(bSize); i > 0; i-- {
+		lengthByte[cha+i-1] = bSize[i-1]
+	}
+	return lengthByte
+}
+
+//get data byte length
+func DataLength(length int) []byte {
+	lengthByte := []byte{'0', '0', '0', '0', '0', '0', '0', '0'}
+	bSize := strconv.Itoa(length)
+	cha := 8 - len(bSize)
+	for i := len(bSize); i > 0; i-- {
+		lengthByte[cha+i-1] = bSize[i-1]
+	}
+	return lengthByte
+}