1 Encoding = new Object();
2 Encoding.UTF8 = "utf-8";
3 Encoding.UTF16 = "utf-16";
4 Encoding.ASCII = "ascii";
7 Encoding.guessEncoding = function (str) {
8 if (str.charCodeAt(0) == 0xEF && str.charCodeAt(1) == 0xBB && str.charCodeAt(2) == 0xBF) {
10 } else if (str.charCodeAt(0) == 0xFF && str.charCodeAt(1) == 0xFE) {
11 return Encoding.UTF16;
13 return Encoding.ASCII;
17 Encoding.readUTF8 = function (str) {
18 var encoding = this.guessEncoding(str);
20 if (encoding == Encoding.UTF8) {
22 } else if (encoding == Encoding.UTF16) {
25 var arrs = new Array();
26 for (var i = startIdx; i < str.length; i++) {
27 var charCode = str.charCodeAt(i);
28 if (charCode < 0x80) {
29 arrs[arrs.length] = str.charAt(i);
30 } else if (charCode > 0xc0 && charCode < 0xe0) {
31 var c1 = charCode & 0x1f;
33 var c2 = str.charCodeAt(i) & 0x3f;
34 var c = (c1 << 6) + c2;
35 arrs[arrs.length] = String.fromCharCode(c);
36 } else if (charCode >= 0xe0) {
37 var c1 = charCode & 0x0f;
39 var c2 = str.charCodeAt(i) & 0x3f;
41 var c3 = str.charCodeAt(i) & 0x3f;
42 var c = (c1 << 12) + (c2 << 6) + c3;
43 arrs[arrs.length] = String.fromCharCode(c);
46 return arrs.join ('');
49 Encoding.convert2UTF8 = function (str) {
50 var encoding = this.guessEncoding(str);
52 if (encoding == Encoding.UTF8) {
54 } else if (encoding == Encoding.UTF16) {
59 var arrs = new Array(offset + str.length - startIdx);
61 arrs[0] = String.fromCharCode(0xEF).charAt(0);
62 arrs[1] = String.fromCharCode(0xBB).charAt(0);
63 arrs[2] = String.fromCharCode(0xBF).charAt(0);
65 for (var i = startIdx; i < str.length; i++) {
66 var charCode = str.charCodeAt(i);
67 if (charCode < 0x80) {
68 arrs[offset + i - startIdx] = str.charAt(i);
69 } else if (charCode <= 0x07ff) { //(charCode > 0xc0 && charCode < 0xe0) {
70 var c1 = 0xc0 + ((charCode & 0x07c0) >> 6);
71 var c2 = 0x80 + (charCode & 0x003f);
72 arrs[offset + i - startIdx] = String.fromCharCode(c1) + String.fromCharCode(c2);
74 var c1 = 0xe0 + ((charCode & 0xf000) >> 12);
75 var c2 = 0x80 + ((charCode & 0x0fc0) >> 6);
76 var c3 = 0x80 + (charCode & 0x003f);
77 arrs[offset + i - startIdx] = String.fromCharCode(c1) + String.fromCharCode(c2) + String.fromCharCode(c3);
80 return arrs.join ('');
82 Encoding.base64Chars = new Array(
83 'A','B','C','D','E','F','G','H',
84 'I','J','K','L','M','N','O','P',
85 'Q','R','S','T','U','V','W','X',
86 'Y','Z','a','b','c','d','e','f',
87 'g','h','i','j','k','l','m','n',
88 'o','p','q','r','s','t','u','v',
89 'w','x','y','z','0','1','2','3',
90 '4','5','6','7','8','9','+','/'
92 Encoding.encodeBase64 = function (str) {
93 if (str == null || str.length == 0) return str;
94 var b64 = Encoding.base64Chars;
95 var length = str.length;
99 while (index < length) {
100 c0 = str.charCodeAt (index++);
101 buf[buf.length] = b64[c0 >> 2];
102 if (index < length) {
103 c1 = str.charCodeAt (index++);
104 buf[buf.length] = b64[((c0 << 4 ) & 0x30) | (c1 >> 4)];
106 c2 = str.charCodeAt (index++);
107 buf[buf.length] = b64[((c1 << 2) & 0x3c) | (c2 >> 6)];
108 buf[buf.length] = b64[c2 & 0x3F];
110 buf[buf.length] = b64[((c1 << 2) & 0x3c)];
111 buf[buf.length] = '=';
114 buf[buf.length] = b64[(c0 << 4) & 0x30];
115 buf[buf.length] = '=';
116 buf[buf.length] = '=';
119 return buf.join ('');
121 Encoding.decodeBase64 = function (str) {
122 if (str == null || str.length == 0) return str;
123 var b64 = Encoding.base64Chars;
124 var xb64 = Encoding.xBase64Chars;
125 if (Encoding.xBase64Chars == null) {
127 for (var i = 0; i < b64.length; i++){
130 Encoding.xBase64Chars = xb64;
132 var length = str.length;
137 while (index < length && c++ < 60000) {
138 c0 = xb64[str.charAt (index++)];
139 c1 = xb64[str.charAt (index++)];
140 c2 = xb64[str.charAt (index++)];
141 c3 = xb64[str.charAt (index++)];
142 buf[buf.length] = String.fromCharCode(((c0 << 2) & 0xff) | c1 >> 4);
144 buf[buf.length] = String.fromCharCode(((c1 << 4) & 0xff) | c2 >> 2);
146 buf[buf.length] = String.fromCharCode(((c2 << 6) & 0xff) | c3);
150 return buf.join ('');