File size: 4,667 Bytes
233f6d4 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 | Encoding = new Object();
Encoding.UTF8 = "utf-8";
Encoding.UTF16 = "utf-16";
Encoding.ASCII = "ascii";
/* protected */
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;
}
};
/* public */
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 ('');
};
/* public */
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);
/*
arrs[0] = String.fromCharCode(0xEF).charAt(0);
arrs[1] = String.fromCharCode(0xBB).charAt(0);
arrs[2] = String.fromCharCode(0xBF).charAt(0);
*/
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) { //(charCode > 0xc0 && charCode < 0xe0) {
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 ('');
};
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