8398c9048d
code was modified slightly, so the code differs from the original downloadable 1.9.5 version
59 lines
1.6 KiB
JavaScript
59 lines
1.6 KiB
JavaScript
dojo.provide("dojox.encoding.ascii85");
|
|
|
|
(function(){
|
|
var c = function(input, length, result){
|
|
var i, j, n, b = [0, 0, 0, 0, 0];
|
|
for(i = 0; i < length; i += 4){
|
|
n = ((input[i] * 256 + input[i+1]) * 256 + input[i+2]) * 256 + input[i+3];
|
|
if(!n){
|
|
result.push("z");
|
|
}else{
|
|
for(j = 0; j < 5; b[j++] = n % 85 + 33, n = Math.floor(n / 85));
|
|
}
|
|
result.push(String.fromCharCode(b[4], b[3], b[2], b[1], b[0]));
|
|
}
|
|
};
|
|
|
|
dojox.encoding.ascii85.encode = function(input){
|
|
// summary: encodes input data in ascii85 string
|
|
// input: Array: an array of numbers (0-255) to encode
|
|
var result = [], reminder = input.length % 4, length = input.length - reminder;
|
|
c(input, length, result);
|
|
if(reminder){
|
|
var t = input.slice(length);
|
|
while(t.length < 4){ t.push(0); }
|
|
c(t, 4, result);
|
|
var x = result.pop();
|
|
if(x == "z"){ x = "!!!!!"; }
|
|
result.push(x.substr(0, reminder + 1));
|
|
}
|
|
return result.join(""); // String
|
|
};
|
|
|
|
dojox.encoding.ascii85.decode = function(input){
|
|
// summary: decodes the input string back to array of numbers
|
|
// input: String: the input string to decode
|
|
var n = input.length, r = [], b = [0, 0, 0, 0, 0], i, j, t, x, y, d;
|
|
for(i = 0; i < n; ++i){
|
|
if(input.charAt(i) == "z"){
|
|
r.push(0, 0, 0, 0);
|
|
continue;
|
|
}
|
|
for(j = 0; j < 5; ++j){ b[j] = input.charCodeAt(i + j) - 33; }
|
|
d = n - i;
|
|
if(d < 5){
|
|
for(j = d; j < 4; b[++j] = 0);
|
|
b[d] = 85;
|
|
}
|
|
t = (((b[0] * 85 + b[1]) * 85 + b[2]) * 85 + b[3]) * 85 + b[4];
|
|
x = t & 255;
|
|
t >>>= 8;
|
|
y = t & 255;
|
|
t >>>= 8;
|
|
r.push(t >>> 8, t & 255, y, x);
|
|
for(j = d; j < 5; ++j, r.pop());
|
|
i += 4;
|
|
}
|
|
return r;
|
|
};
|
|
})();
|