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Added a file with functions to encode/decode base64 with javascript

This commit is contained in:
Alejandro Gallardo Escobar 2015-12-18 13:06:09 +01:00
parent 5ed043eeab
commit 702f008cbe
1 changed files with 201 additions and 0 deletions
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201
pandora_console/include/javascript/pandora.base64.js Normal file
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// pandora.base64.js
// Exports the strToBase64 and base64ToStr functions
(function () {
"use strict";
/*\
|*|
|*| Base64 / binary data / UTF-8 strings utilities
|*|
|*| https://developer.mozilla.org/en-US/docs/Web/JavaScript/Base64_encoding_and_decoding
|*|
\*/
/* Array of bytes to base64 string decoding */
function b64ToUint6 (nChr) {
return nChr > 64 && nChr < 91 ?
nChr - 65
: nChr > 96 && nChr < 123 ?
nChr - 71
: nChr > 47 && nChr < 58 ?
nChr + 4
: nChr === 43 ?
62
: nChr === 47 ?
63
:
0;
}
function base64DecToArr (sBase64, nBlocksSize) {
var
sB64Enc = sBase64.replace(/[^A-Za-z0-9\+\/]/g, ""), nInLen = sB64Enc.length,
nOutLen = nBlocksSize ? Math.ceil((nInLen * 3 + 1 >> 2) / nBlocksSize) * nBlocksSize : nInLen * 3 + 1 >> 2, taBytes = new Uint8Array(nOutLen);
for (var nMod3, nMod4, nUint24 = 0, nOutIdx = 0, nInIdx = 0; nInIdx < nInLen; nInIdx++) {
nMod4 = nInIdx & 3;
nUint24 |= b64ToUint6(sB64Enc.charCodeAt(nInIdx)) << 18 - 6 * nMod4;
if (nMod4 === 3 || nInLen - nInIdx === 1) {
for (nMod3 = 0; nMod3 < 3 && nOutIdx < nOutLen; nMod3++, nOutIdx++) {
taBytes[nOutIdx] = nUint24 >>> (16 >>> nMod3 & 24) & 255;
}
nUint24 = 0;
}
}
return taBytes;
}
/* Base64 string to array encoding */
function uint6ToB64 (nUint6) {
return nUint6 < 26 ?
nUint6 + 65
: nUint6 < 52 ?
nUint6 + 71
: nUint6 < 62 ?
nUint6 - 4
: nUint6 === 62 ?
43
: nUint6 === 63 ?
47
:
65;
}
function base64EncArr (aBytes) {
var nMod3 = 2, sB64Enc = "";
for (var nLen = aBytes.length, nUint24 = 0, nIdx = 0; nIdx < nLen; nIdx++) {
nMod3 = nIdx % 3;
if (nIdx > 0 && (nIdx * 4 / 3) % 76 === 0) { sB64Enc += "\r\n"; }
nUint24 |= aBytes[nIdx] << (16 >>> nMod3 & 24);
if (nMod3 === 2 || aBytes.length - nIdx === 1) {
sB64Enc += String.fromCharCode(uint6ToB64(nUint24 >>> 18 & 63), uint6ToB64(nUint24 >>> 12 & 63), uint6ToB64(nUint24 >>> 6 & 63), uint6ToB64(nUint24 & 63));
nUint24 = 0;
}
}
return sB64Enc.substr(0, sB64Enc.length - 2 + nMod3) + (nMod3 === 2 ? '' : nMod3 === 1 ? '=' : '==');
}
/* UTF-8 array to DOMString and vice versa */
function UTF8ArrToStr (aBytes) {
var sView = "";
for (var nPart, nLen = aBytes.length, nIdx = 0; nIdx < nLen; nIdx++) {
nPart = aBytes[nIdx];
sView += String.fromCharCode(
nPart > 251 && nPart < 254 && nIdx + 5 < nLen ? /* six bytes */
/* (nPart - 252 << 30) may be not so safe in ECMAScript! So...: */
(nPart - 252) * 1073741824 + (aBytes[++nIdx] - 128 << 24) + (aBytes[++nIdx] - 128 << 18) + (aBytes[++nIdx] - 128 << 12) + (aBytes[++nIdx] - 128 << 6) + aBytes[++nIdx] - 128
: nPart > 247 && nPart < 252 && nIdx + 4 < nLen ? /* five bytes */
(nPart - 248 << 24) + (aBytes[++nIdx] - 128 << 18) + (aBytes[++nIdx] - 128 << 12) + (aBytes[++nIdx] - 128 << 6) + aBytes[++nIdx] - 128
: nPart > 239 && nPart < 248 && nIdx + 3 < nLen ? /* four bytes */
(nPart - 240 << 18) + (aBytes[++nIdx] - 128 << 12) + (aBytes[++nIdx] - 128 << 6) + aBytes[++nIdx] - 128
: nPart > 223 && nPart < 240 && nIdx + 2 < nLen ? /* three bytes */
(nPart - 224 << 12) + (aBytes[++nIdx] - 128 << 6) + aBytes[++nIdx] - 128
: nPart > 191 && nPart < 224 && nIdx + 1 < nLen ? /* two bytes */
(nPart - 192 << 6) + aBytes[++nIdx] - 128
: /* nPart < 127 ? */ /* one byte */
nPart
);
}
return sView;
}
function strToUTF8Arr (sDOMStr) {
var aBytes, nChr, nStrLen = sDOMStr.length, nArrLen = 0;
/* mapping... */
for (var nMapIdx = 0; nMapIdx < nStrLen; nMapIdx++) {
nChr = sDOMStr.charCodeAt(nMapIdx);
nArrLen += nChr < 0x80 ? 1 : nChr < 0x800 ? 2 : nChr < 0x10000 ? 3 : nChr < 0x200000 ? 4 : nChr < 0x4000000 ? 5 : 6;
}
aBytes = new Uint8Array(nArrLen);
/* transcription... */
for (var nIdx = 0, nChrIdx = 0; nIdx < nArrLen; nChrIdx++) {
nChr = sDOMStr.charCodeAt(nChrIdx);
if (nChr < 128) {
/* one byte */
aBytes[nIdx++] = nChr;
} else if (nChr < 0x800) {
/* two bytes */
aBytes[nIdx++] = 192 + (nChr >>> 6);
aBytes[nIdx++] = 128 + (nChr & 63);
} else if (nChr < 0x10000) {
/* three bytes */
aBytes[nIdx++] = 224 + (nChr >>> 12);
aBytes[nIdx++] = 128 + (nChr >>> 6 & 63);
aBytes[nIdx++] = 128 + (nChr & 63);
} else if (nChr < 0x200000) {
/* four bytes */
aBytes[nIdx++] = 240 + (nChr >>> 18);
aBytes[nIdx++] = 128 + (nChr >>> 12 & 63);
aBytes[nIdx++] = 128 + (nChr >>> 6 & 63);
aBytes[nIdx++] = 128 + (nChr & 63);
} else if (nChr < 0x4000000) {
/* five bytes */
aBytes[nIdx++] = 248 + (nChr >>> 24);
aBytes[nIdx++] = 128 + (nChr >>> 18 & 63);
aBytes[nIdx++] = 128 + (nChr >>> 12 & 63);
aBytes[nIdx++] = 128 + (nChr >>> 6 & 63);
aBytes[nIdx++] = 128 + (nChr & 63);
} else /* if (nChr <= 0x7fffffff) */ {
/* six bytes */
aBytes[nIdx++] = 252 + (nChr >>> 30);
aBytes[nIdx++] = 128 + (nChr >>> 24 & 63);
aBytes[nIdx++] = 128 + (nChr >>> 18 & 63);
aBytes[nIdx++] = 128 + (nChr >>> 12 & 63);
aBytes[nIdx++] = 128 + (nChr >>> 6 & 63);
aBytes[nIdx++] = 128 + (nChr & 63);
}
}
return aBytes;
}
function strToBase64 (strInput) {
if (typeof strInput !== 'string')
throw new TypeError('The input should be a string')
return base64EncArr(strToUTF8Arr(strInput))
}
function base64ToStr (base64Input) {
if (typeof base64Input !== 'string')
throw new TypeError('The input should be a string')
return UTF8ArrToStr(base64DecToArr(base64Input))
}
// Export the functions to the global scope
if (window) {
if (!window.strToBase64)
window.strToBase64 = strToBase64
if (!window.base64ToStr)
window.base64ToStr = base64ToStr
}
}) ()