refactor: mylib 重命名为 libs

更清晰的目录命名，libs/ 存放内嵌的独立协议实现库。

libs/grdp/core/util.go

@@ -0,0 +1,67 @@
+package core
+
+import (
+	"bytes"
+	"crypto/rand"
+	"encoding/binary"
+	"unicode/utf16"
+)
+
+func Reverse(s []byte) []byte {
+	for i, j := 0, len(s)-1; i < j; i, j = i+1, j-1 {
+		s[i], s[j] = s[j], s[i]
+	}
+	return s
+}
+
+func Random(n int) []byte {
+	const alpha = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
+	var bytes = make([]byte, n)
+	rand.Read(bytes)
+	for i, b := range bytes {
+		bytes[i] = alpha[b%byte(len(alpha))]
+	}
+	return bytes
+}
+
+func UTF16ToLittleEndianBytes(u []uint16) []byte {
+	b := make([]byte, 2*len(u))
+	for index, value := range u {
+		binary.LittleEndian.PutUint16(b[index*2:], value)
+	}
+	return b
+}
+
+func LittleEndianBytesToUTF16(u []byte) []uint16 {
+	b := make([]uint16, 0, len(u)/2)
+	n := make([]byte, 2)
+	for i, v := range u {
+		if i%2 == 0 {
+			n[0] = v
+		} else {
+			n[1] = v
+			b = append(b, binary.LittleEndian.Uint16(n))
+		}
+	}
+	return b
+}
+
+// s.encode('utf-16le')
+func UnicodeEncode(p string) []byte {
+	return UTF16ToLittleEndianBytes(utf16.Encode([]rune(p)))
+}
+
+func UnicodeDecode(p []byte) string {
+	r := bytes.NewReader(p)
+	n := make([]uint16, 0, 100)
+	for r.Len() > 0 {
+		a, _ := ReadUint16LE(r)
+		n = append(n, a)
+	}
+	//n := LittleEndianBytesToUTF16(p)
+	return string(utf16.Decode(n))
+}
+
+func BytesToUint64(b []byte) uint64 {
+	return binary.LittleEndian.Uint64(b)
+}