// From: http://hg.mozilla.org/mozilla-central/raw-file/ec10630b1a54/js/src/devtools/jint/sunspider/string-base64.js
-/*jslint white: false, bitwise: false, plusplus: false */
+/*jslint white: false */
/*global console */
var Base64 = {
+ /* Convert data (an array of integers) to a Base64 string. */
+ toBase64Table : 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/='.split(''),
+ base64Pad : '=',
+
+ encode: function (data) {
+ "use strict";
+ var result = '';
+ var toBase64Table = Base64.toBase64Table;
+ var length = data.length;
+ var lengthpad = (length % 3);
+ // Convert every three bytes to 4 ascii characters.
+
+ for (var i = 0; i < (length - 2); i += 3) {
+ result += toBase64Table[data[i] >> 2];
+ result += toBase64Table[((data[i] & 0x03) << 4) + (data[i + 1] >> 4)];
+ result += toBase64Table[((data[i + 1] & 0x0f) << 2) + (data[i + 2] >> 6)];
+ result += toBase64Table[data[i + 2] & 0x3f];
+ }
-/* Convert data (an array of integers) to a Base64 string. */
-toBase64Table : 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/='.split(''),
-base64Pad : '=',
-
-encode: function (data) {
- "use strict";
- var result = '';
- var toBase64Table = Base64.toBase64Table;
- var length = data.length
- var lengthpad = (length%3);
- var i = 0, j = 0;
- // Convert every three bytes to 4 ascii characters.
- /* BEGIN LOOP */
- for (i = 0; i < (length - 2); i += 3) {
- result += toBase64Table[data[i] >> 2];
- result += toBase64Table[((data[i] & 0x03) << 4) + (data[i+1] >> 4)];
- result += toBase64Table[((data[i+1] & 0x0f) << 2) + (data[i+2] >> 6)];
- result += toBase64Table[data[i+2] & 0x3f];
- }
- /* END LOOP */
-
- // Convert the remaining 1 or 2 bytes, pad out to 4 characters.
- if (lengthpad === 2) {
- j = length - lengthpad;
- result += toBase64Table[data[j] >> 2];
- result += toBase64Table[((data[j] & 0x03) << 4) + (data[j+1] >> 4)];
- result += toBase64Table[(data[j+1] & 0x0f) << 2];
- result += toBase64Table[64];
- } else if (lengthpad === 1) {
- j = length - lengthpad;
- result += toBase64Table[data[j] >> 2];
- result += toBase64Table[(data[j] & 0x03) << 4];
- result += toBase64Table[64];
- result += toBase64Table[64];
- }
-
- return result;
-},
-
-/* Convert Base64 data to a string */
-toBinaryTable : [
- -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
- -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
- -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,62, -1,-1,-1,63,
- 52,53,54,55, 56,57,58,59, 60,61,-1,-1, -1, 0,-1,-1,
- -1, 0, 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,-1, -1,-1,-1,-1,
- -1,26,27,28, 29,30,31,32, 33,34,35,36, 37,38,39,40,
- 41,42,43,44, 45,46,47,48, 49,50,51,-1, -1,-1,-1,-1
-],
-
-decode: function (data, offset) {
- "use strict";
- offset = typeof(offset) !== 'undefined' ? offset : 0;
- var toBinaryTable = Base64.toBinaryTable;
- var base64Pad = Base64.base64Pad;
- var result, result_length, idx, i, c, padding;
- var leftbits = 0; // number of bits decoded, but yet to be appended
- var leftdata = 0; // bits decoded, but yet to be appended
- var data_length = data.indexOf('=') - offset;
-
- if (data_length < 0) { data_length = data.length - offset; }
-
- /* Every four characters is 3 resulting numbers */
- result_length = (data_length >> 2) * 3 + Math.floor((data_length%4)/1.5);
- result = new Array(result_length);
-
- // Convert one by one.
- /* BEGIN LOOP */
- for (idx = 0, i = offset; i < data.length; i++) {
- c = toBinaryTable[data.charCodeAt(i) & 0x7f];
- padding = (data.charAt(i) === base64Pad);
- // Skip illegal characters and whitespace
- if (c === -1) {
- console.error("Illegal character code " + data.charCodeAt(i) + " at position " + i);
- continue;
+ // Convert the remaining 1 or 2 bytes, pad out to 4 characters.
+ var j = 0;
+ if (lengthpad === 2) {
+ j = length - lengthpad;
+ result += toBase64Table[data[j] >> 2];
+ result += toBase64Table[((data[j] & 0x03) << 4) + (data[j + 1] >> 4)];
+ result += toBase64Table[(data[j + 1] & 0x0f) << 2];
+ result += toBase64Table[64];
+ } else if (lengthpad === 1) {
+ j = length - lengthpad;
+ result += toBase64Table[data[j] >> 2];
+ result += toBase64Table[(data[j] & 0x03) << 4];
+ result += toBase64Table[64];
+ result += toBase64Table[64];
}
-
- // Collect data into leftdata, update bitcount
- leftdata = (leftdata << 6) | c;
- leftbits += 6;
- // If we have 8 or more bits, append 8 bits to the result
- if (leftbits >= 8) {
- leftbits -= 8;
- // Append if not padding.
- if (!padding) {
- result[idx++] = (leftdata >> leftbits) & 0xff;
+ return result;
+ },
+
+ /* Convert Base64 data to a string */
+ /* jshint -W013 */
+ toBinaryTable : [
+ -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
+ -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1,
+ -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,62, -1,-1,-1,63,
+ 52,53,54,55, 56,57,58,59, 60,61,-1,-1, -1, 0,-1,-1,
+ -1, 0, 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,-1, -1,-1,-1,-1,
+ -1,26,27,28, 29,30,31,32, 33,34,35,36, 37,38,39,40,
+ 41,42,43,44, 45,46,47,48, 49,50,51,-1, -1,-1,-1,-1
+ ],
+ /* jshint +W013 */
+
+ decode: function (data, offset) {
+ "use strict";
+ offset = typeof(offset) !== 'undefined' ? offset : 0;
+ var toBinaryTable = Base64.toBinaryTable;
+ var base64Pad = Base64.base64Pad;
+ var result, result_length;
+ var leftbits = 0; // number of bits decoded, but yet to be appended
+ var leftdata = 0; // bits decoded, but yet to be appended
+ var data_length = data.indexOf('=') - offset;
+
+ if (data_length < 0) { data_length = data.length - offset; }
+
+ /* Every four characters is 3 resulting numbers */
+ result_length = (data_length >> 2) * 3 + Math.floor((data_length % 4) / 1.5);
+ result = new Array(result_length);
+
+ // Convert one by one.
+ for (var idx = 0, i = offset; i < data.length; i++) {
+ var c = toBinaryTable[data.charCodeAt(i) & 0x7f];
+ var padding = (data.charAt(i) === base64Pad);
+ // Skip illegal characters and whitespace
+ if (c === -1) {
+ console.error("Illegal character code " + data.charCodeAt(i) + " at position " + i);
+ continue;
+ }
+
+ // Collect data into leftdata, update bitcount
+ leftdata = (leftdata << 6) | c;
+ leftbits += 6;
+
+ // If we have 8 or more bits, append 8 bits to the result
+ if (leftbits >= 8) {
+ leftbits -= 8;
+ // Append if not padding.
+ if (!padding) {
+ result[idx++] = (leftdata >> leftbits) & 0xff;
+ }
+ leftdata &= (1 << leftbits) - 1;
}
- leftdata &= (1 << leftbits) - 1;
}
- }
- /* END LOOP */
- // If there are any bits left, the base64 string was corrupted
- if (leftbits) {
- throw {name: 'Base64-Error',
- message: 'Corrupted base64 string'};
- }
-
- return result;
-}
+ // If there are any bits left, the base64 string was corrupted
+ if (leftbits) {
+ err = new Error('Corrupted base64 string');
+ err.name = 'Base64-Error';
+ throw err;
+ }
+ return result;
+ }
}; /* End of Base64 namespace */