cafe-grader-web

Location: cafe-grader-web/lib/assets/libs/_base64.js - annotation

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Commit Description:
Merge pull request #17 from nattee/master...
Commit Description:
Merge pull request #17 from nattee/master upgrade to current working snapshot
References:
r715:88baf2c40c51 merge default
File last commit:
r584:056392c00e67 merge java
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Action:
lib/assets/libs/_base64.js | 162 lines | 4.4 KiB | application/javascript | JavascriptLexer |
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admin
merge with algo and add brython files that were missing
 r584 var $module=(function($B){
var _b_ = $B.builtins,
_keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="
function make_alphabet(altchars){
var alphabet = _keyStr
if(altchars!==undefined && altchars!==_b_.None){
// altchars is an instance of Python bytes
var source = altchars.source
alphabet = alphabet.substr(0,alphabet.length-3)+
_b_.chr(source[0])+_b_.chr(source[1])+'='
}
return alphabet
}
var Base64 = {
encode: function(bytes, altchars) {
var input = bytes.source
var output = "";
var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
var i = 0;
var alphabet = make_alphabet(altchars)
while (i < input.length) {
chr1 = input[i++];
chr2 = input[i++];
chr3 = input[i++];
enc1 = chr1 >> 2;
enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
enc4 = chr3 & 63;
if (isNaN(chr2)) {
enc3 = enc4 = 64;
} else if (isNaN(chr3)) {
enc4 = 64;
}
output = output + alphabet.charAt(enc1) +
alphabet.charAt(enc2) +
alphabet.charAt(enc3) +
alphabet.charAt(enc4);
}
return _b_.bytes(output, 'utf-8', 'strict');
},
decode: function(bytes, altchars, validate) {
var output = [];
var chr1, chr2, chr3;
var enc1, enc2, enc3, enc4;
var alphabet = make_alphabet(altchars)
var input = bytes.source
// If validate is set, check that all characters in input
// are in the alphabet
var _input = ''
for(var i=0, len=input.length;i<len;i++){
var car = String.fromCharCode(input[i])
if(alphabet.search(car)==-1){
if(validate){throw 'binascii_error'}
}else{_input+=car}
}
input = _input;
var i = 0;
while (i < input.length) {
enc1 = alphabet.indexOf(input.charAt(i++));
enc2 = alphabet.indexOf(input.charAt(i++));
enc3 = alphabet.indexOf(input.charAt(i++));
enc4 = alphabet.indexOf(input.charAt(i++));
chr1 = (enc1 << 2) | (enc2 >> 4);
chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
chr3 = ((enc3 & 3) << 6) | enc4;
output.push(chr1);
if (enc3 != 64) {
output.push(chr2);
}
if (enc4 != 64) {
output.push(chr3);
}
}
// return Python bytes
return _b_.bytes(output, 'utf-8', 'strict')
},
_utf8_encode: function(string) {
string = string.replace(/\r\n/g, "\n");
var utftext = "";
for (var n = 0; n < string.length; n++) {
var c = string.charCodeAt(n);
if (c < 128) {
utftext += String.fromCharCode(c);
}
else if ((c > 127) && (c < 2048)) {
utftext += String.fromCharCode((c >> 6) | 192);
utftext += String.fromCharCode((c & 63) | 128);
}
else {
utftext += String.fromCharCode((c >> 12) | 224);
utftext += String.fromCharCode(((c >> 6) & 63) | 128);
utftext += String.fromCharCode((c & 63) | 128);
}
}
return utftext;
},
_utf8_decode: function(utftext) {
var string = "";
var i = 0;
var c = c1 = c2 = 0;
while (i < utftext.length) {
c = utftext.charCodeAt(i);
if (c < 128) {
string += String.fromCharCode(c);
i++;
}
else if ((c > 191) && (c < 224)) {
c2 = utftext.charCodeAt(i + 1);
string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
i += 2;
}
else {
c2 = utftext.charCodeAt(i + 1);
c3 = utftext.charCodeAt(i + 2);
string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
i += 3;
}
}
return string;
}
}
return {Base64:Base64}
}
)(__BRYTHON__)