47 lines
1.4 KiB
JavaScript
47 lines
1.4 KiB
JavaScript
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dojo.provide("dojox.encoding.easy64");
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(function(){
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var c = function(input, length, result){
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for(var i = 0; i < length; i += 3){
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result.push(
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String.fromCharCode((input[i] >>> 2) + 33),
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String.fromCharCode(((input[i] & 3) << 4) + (input[i + 1] >>> 4) + 33),
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String.fromCharCode(((input[i + 1] & 15) << 2) + (input[i + 2] >>> 6) + 33),
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String.fromCharCode((input[i + 2] & 63) + 33)
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);
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}
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};
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dojox.encoding.easy64.encode = function(input){
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// summary: encodes input data in easy64 string
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// input: Array: an array of numbers (0-255) to encode
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var result = [], reminder = input.length % 3, length = input.length - reminder;
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c(input, length, result);
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if(reminder){
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var t = input.slice(length);
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while(t.length < 3){ t.push(0); }
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c(t, 3, result);
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for(var i = 3; i > reminder; result.pop(), --i);
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}
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return result.join(""); // String
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};
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dojox.encoding.easy64.decode = function(input){
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// summary: decodes the input string back to array of numbers
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// input: String: the input string to decode
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var n = input.length, r = [], b = [0, 0, 0, 0], i, j, d;
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for(i = 0; i < n; i += 4){
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for(j = 0; j < 4; ++j){ b[j] = input.charCodeAt(i + j) - 33; }
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d = n - i;
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for(j = d; j < 4; b[++j] = 0);
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r.push(
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(b[0] << 2) + (b[1] >>> 4),
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((b[1] & 15) << 4) + (b[2] >>> 2),
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((b[2] & 3) << 6) + b[3]
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);
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for(j = d; j < 4; ++j, r.pop());
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}
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return r;
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};
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})();
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