| Encoding = new Object();
|
| Encoding.UTF8 = "utf-8";
|
| Encoding.UTF16 = "utf-16";
|
| Encoding.ASCII = "ascii";
|
|
|
|
|
| Encoding.guessEncoding = function (str) {
|
| if (str.charCodeAt(0) == 0xEF && str.charCodeAt(1) == 0xBB && str.charCodeAt(2) == 0xBF) {
|
| return Encoding.UTF8;
|
| } else if (str.charCodeAt(0) == 0xFF && str.charCodeAt(1) == 0xFE) {
|
| return Encoding.UTF16;
|
| } else {
|
| return Encoding.ASCII;
|
| }
|
| };
|
|
|
| Encoding.readUTF8 = function (str) {
|
| var encoding = this.guessEncoding(str);
|
| var startIdx = 0;
|
| if (encoding == Encoding.UTF8) {
|
| startIdx = 3;
|
| } else if (encoding == Encoding.UTF16) {
|
| startIdx = 2;
|
| }
|
| var arrs = new Array();
|
| for (var i = startIdx; i < str.length; i++) {
|
| var charCode = str.charCodeAt(i);
|
| if (charCode < 0x80) {
|
| arrs[arrs.length] = str.charAt(i);
|
| } else if (charCode > 0xc0 && charCode < 0xe0) {
|
| var c1 = charCode & 0x1f;
|
| i++;
|
| var c2 = str.charCodeAt(i) & 0x3f;
|
| var c = (c1 << 6) + c2;
|
| arrs[arrs.length] = String.fromCharCode(c);
|
| } else if (charCode >= 0xe0) {
|
| var c1 = charCode & 0x0f;
|
| i++;
|
| var c2 = str.charCodeAt(i) & 0x3f;
|
| i++;
|
| var c3 = str.charCodeAt(i) & 0x3f;
|
| var c = (c1 << 12) + (c2 << 6) + c3;
|
| arrs[arrs.length] = String.fromCharCode(c);
|
| }
|
| }
|
| return arrs.join ('');
|
| };
|
|
|
| Encoding.convert2UTF8 = function (str) {
|
| var encoding = this.guessEncoding(str);
|
| var startIdx = 0;
|
| if (encoding == Encoding.UTF8) {
|
| return str;
|
| } else if (encoding == Encoding.UTF16) {
|
| startIdx = 2;
|
| }
|
|
|
| var offset = 0;
|
| var arrs = new Array(offset + str.length - startIdx);
|
| |
| |
| |
| |
|
|
| for (var i = startIdx; i < str.length; i++) {
|
| var charCode = str.charCodeAt(i);
|
| if (charCode < 0x80) {
|
| arrs[offset + i - startIdx] = str.charAt(i);
|
| } else if (charCode <= 0x07ff) {
|
| var c1 = 0xc0 + ((charCode & 0x07c0) >> 6);
|
| var c2 = 0x80 + (charCode & 0x003f);
|
| arrs[offset + i - startIdx] = String.fromCharCode(c1) + String.fromCharCode(c2);
|
| } else {
|
| var c1 = 0xe0 + ((charCode & 0xf000) >> 12);
|
| var c2 = 0x80 + ((charCode & 0x0fc0) >> 6);
|
| var c3 = 0x80 + (charCode & 0x003f);
|
| arrs[offset + i - startIdx] = String.fromCharCode(c1) + String.fromCharCode(c2) + String.fromCharCode(c3);
|
| }
|
| }
|
| return arrs.join ('');
|
| };
|
| Encoding.base64Chars = new Array(
|
| 'A','B','C','D','E','F','G','H',
|
| 'I','J','K','L','M','N','O','P',
|
| 'Q','R','S','T','U','V','W','X',
|
| 'Y','Z','a','b','c','d','e','f',
|
| 'g','h','i','j','k','l','m','n',
|
| 'o','p','q','r','s','t','u','v',
|
| 'w','x','y','z','0','1','2','3',
|
| '4','5','6','7','8','9','+','/'
|
| );
|
| Encoding.encodeBase64 = function (str) {
|
| if (str == null || str.length == 0) return str;
|
| var b64 = Encoding.base64Chars;
|
| var length = str.length;
|
| var index = 0;
|
| var buf = [];
|
| var c0, c1, c2;
|
| while (index < length) {
|
| c0 = str.charCodeAt (index++);
|
| buf[buf.length] = b64[c0 >> 2];
|
| if (index < length) {
|
| c1 = str.charCodeAt (index++);
|
| buf[buf.length] = b64[((c0 << 4 ) & 0x30) | (c1 >> 4)];
|
| if (index < length){
|
| c2 = str.charCodeAt (index++);
|
| buf[buf.length] = b64[((c1 << 2) & 0x3c) | (c2 >> 6)];
|
| buf[buf.length] = b64[c2 & 0x3F];
|
| } else {
|
| buf[buf.length] = b64[((c1 << 2) & 0x3c)];
|
| buf[buf.length] = '=';
|
| }
|
| } else {
|
| buf[buf.length] = b64[(c0 << 4) & 0x30];
|
| buf[buf.length] = '=';
|
| buf[buf.length] = '=';
|
| }
|
| }
|
| return buf.join ('');
|
| };
|
| Encoding.decodeBase64 = function (str) {
|
| if (str == null || str.length == 0) return str;
|
| var b64 = Encoding.base64Chars;
|
| var xb64 = Encoding.xBase64Chars;
|
| if (Encoding.xBase64Chars == null) {
|
| xb64 = new Object();
|
| for (var i = 0; i < b64.length; i++){
|
| xb64[b64[i]] = i;
|
| }
|
| Encoding.xBase64Chars = xb64;
|
| }
|
| var length = str.length;
|
| var index = 0;
|
| var buf = [];
|
| var c0, c1, c2, c3;
|
| var c = 0;
|
| while (index < length && c++ < 60000) {
|
| c0 = xb64[str.charAt (index++)];
|
| c1 = xb64[str.charAt (index++)];
|
| c2 = xb64[str.charAt (index++)];
|
| c3 = xb64[str.charAt (index++)];
|
| buf[buf.length] = String.fromCharCode(((c0 << 2) & 0xff) | c1 >> 4);
|
| if (c2 != null) {
|
| buf[buf.length] = String.fromCharCode(((c1 << 4) & 0xff) | c2 >> 2);
|
| if (c3 != null) {
|
| buf[buf.length] = String.fromCharCode(((c2 << 6) & 0xff) | c3);
|
| }
|
| }
|
| }
|
| return buf.join ('');
|
| };
|
|
|
