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- function G_Base64() {
- this.byteToCharMap_ = {};
- this.charToByteMap_ = {};
- this.byteToCharMapWebSafe_ = {};
- this.charToByteMapWebSafe_ = {};
- this.init_();
- }
- G_Base64.ENCODED_VALS = "ABCDEFGHIJKLMNOPQRSTUVWXYZ" +
- "abcdefghijklmnopqrstuvwxyz" +
- "0123456789+/=";
- G_Base64.ENCODED_VALS_WEBSAFE = "ABCDEFGHIJKLMNOPQRSTUVWXYZ" +
- "abcdefghijklmnopqrstuvwxyz" +
- "0123456789-_=";
- G_Base64.prototype.init_ = function() {
- for (var i = 0; i < G_Base64.ENCODED_VALS.length; i++) {
- this.byteToCharMap_[i] = G_Base64.ENCODED_VALS.charAt(i);
- this.charToByteMap_[this.byteToCharMap_[i]] = i;
- this.byteToCharMapWebSafe_[i] = G_Base64.ENCODED_VALS_WEBSAFE.charAt(i);
- this.charToByteMapWebSafe_[this.byteToCharMapWebSafe_[i]] = i;
- }
- }
- G_Base64.prototype.encodeByteArray = function(input, opt_webSafe) {
- if (!(input instanceof Array))
- throw new Error("encodeByteArray takes an array as a parameter");
- var byteToCharMap = opt_webSafe ?
- this.byteToCharMapWebSafe_ :
- this.byteToCharMap_;
- var output = [];
- var i = 0;
- while (i < input.length) {
- var byte1 = input[i];
- var haveByte2 = i + 1 < input.length;
- var byte2 = haveByte2 ? input[i + 1] : 0;
- var haveByte3 = i + 2 < input.length;
- var byte3 = haveByte3 ? input[i + 2] : 0;
- var outByte1 = byte1 >> 2;
- var outByte2 = ((byte1 & 0x03) << 4) | (byte2 >> 4);
- var outByte3 = ((byte2 & 0x0F) << 2) | (byte3 >> 6);
- var outByte4 = byte3 & 0x3F;
- if (!haveByte3) {
- outByte4 = 64;
- if (!haveByte2)
- outByte3 = 64;
- }
- output.push(byteToCharMap[outByte1]);
- output.push(byteToCharMap[outByte2]);
- output.push(byteToCharMap[outByte3]);
- output.push(byteToCharMap[outByte4]);
- i += 3;
- }
- return output.join("");
- }
- G_Base64.prototype.decodeString = function(input, opt_webSafe) {
- if (input.length % 4)
- throw new Error("Length of b64-encoded data must be zero mod four");
- var charToByteMap = opt_webSafe ?
- this.charToByteMapWebSafe_ :
- this.charToByteMap_;
- var output = [];
- var i = 0;
- while (i < input.length) {
- var byte1 = charToByteMap[input.charAt(i)];
- var byte2 = charToByteMap[input.charAt(i + 1)];
- var byte3 = charToByteMap[input.charAt(i + 2)];
- var byte4 = charToByteMap[input.charAt(i + 3)];
- if (byte1 === undefined || byte2 === undefined ||
- byte3 === undefined || byte4 === undefined)
- throw new Error("String contains characters not in our alphabet: " +
- input);
- var outByte1 = (byte1 << 2) | (byte2 >> 4);
- output.push(outByte1);
- if (byte3 != 64) {
- var outByte2 = ((byte2 << 4) & 0xF0) | (byte3 >> 2);
- output.push(outByte2);
- if (byte4 != 64) {
- var outByte3 = ((byte3 << 6) & 0xC0) | byte4;
- output.push(outByte3);
- }
- }
- i += 4;
- }
- return output;
- }
- G_Base64.prototype.arrayifyString = function(str) {
- var output = [];
- for (var i = 0; i < str.length; i++) {
- var c = str.charCodeAt(i);
- while (c > 0xff) {
- output.push(c & 0xff);
- c >>= 8;
- }
- output.push(c);
- }
- return output;
- }
- G_Base64.prototype.stringifyArray = function(array) {
- var output = [];
- for (var i = 0; i < array.length; i++)
- output[i] = String.fromCharCode(array[i]);
- return output.join("");
- }
- function TEST_G_Base64() {
- if (G_GDEBUG) {
- var z = "base64 UNITTEST";
- G_debugService.enableZone(z);
- G_Debug(z, "Starting");
- var b = new G_Base64();
- var tests =
- [ "", "",
- "f", "Zg==",
- "fo", "Zm8=",
- "foo", "Zm9v",
- "foob", "Zm9vYg==",
- "fooba", "Zm9vYmE=",
- "foobar", "Zm9vYmFy",
- "一二三四五六七八九十", "5LiA5LqM5LiJ5Zub5LqU5YWt5LiD5YWr5Lmd5Y2B"];
- for (var i = 0; i < tests.length; i += 2) {
- var enc = b.encodeByteArray(b.arrayifyString(tests[i]));
- G_Assert(z, enc === tests[i + 1],
- "Error encoding: " + tests[i] + " (got " + enc +
- " but wanted " + tests[i + 1] + ")");
- var dec = b.stringifyArray(b.decodeString(enc));
- G_Assert(z, dec === tests[i],
- "Error deocding " + enc + " (got " + dec +
- " but wanted " + tests[i] + ")");
- }
- var numIterations = 100;
- for (var i = 0; i < numIterations; i++) {
- var input = [];
- for (var j = 0; j < i; j++)
- input[j] = j % 256;
- var encoded = b.encodeByteArray(input);
- var decoded = b.decodeString(encoded);
- G_Assert(z, !(encoded.length % 4), "Encoded length not a multiple of 4?");
- G_Assert(z, input.length == decoded.length,
- "Decoded length not equal to input length?");
- for (var j = 0; j < i; j++)
- G_Assert(z, input[j] === decoded[j], "Values differ at position " + j);
- }
- var test = ">>>???>>>???";
- var enc = b.encodeByteArray(b.arrayifyString(test));
- G_Assert(z, enc == "Pj4+Pz8/Pj4+Pz8/", "Non-websafe broken?");
- enc = b.encodeByteArray(b.arrayifyString(test), true /* websafe */);
- G_Assert(z, enc == "Pj4-Pz8_Pj4-Pz8_", "Websafe encoding broken");
- var dec = b.stringifyArray(b.decodeString(enc, true /* websafe */));
- G_Assert(z, dec === test, "Websafe dencoding broken");
- var caught = false;
- try {
- b.decodeString("foooooo+oooo", true /*websafe*/);
- } catch(e) {
- caught = true;
- }
- G_Assert(z, caught, "Didn't throw on malformed input");
- G_Debug(z, "PASSED");
- }
- }
-