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Просмотр файла: base32.js
/*
* [hi-base32]{@link https://github.com/emn178/hi-base32}
*
* @version 0.5.0
* @author Chen, Yi-Cyuan [emn178@gmail.com]
* @copyright Chen, Yi-Cyuan 2015-2018
* @license MIT
*/
/*jslint bitwise: true */
(function () {
'use strict';
var root = typeof window === 'object' ? window : {};
var NODE_JS = !root.HI_BASE32_NO_NODE_JS && typeof process === 'object' && process.versions && process.versions.node;
if (NODE_JS) {
root = global;
}
var COMMON_JS = !root.HI_BASE32_NO_COMMON_JS && typeof module === 'object' && module.exports;
var AMD = typeof define === 'function' && define.amd;
var BASE32_ENCODE_CHAR = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ234567'.split('');
var BASE32_DECODE_CHAR = {
'A': 0, 'B': 1, 'C': 2, 'D': 3, 'E': 4, 'F': 5, 'G': 6, 'H': 7, 'I': 8,
'J': 9, 'K': 10, 'L': 11, 'M': 12, 'N': 13, 'O': 14, 'P': 15, 'Q': 16,
'R': 17, 'S': 18, 'T': 19, 'U': 20, 'V': 21, 'W': 22, 'X': 23, 'Y': 24,
'Z': 25, '2': 26, '3': 27, '4': 28, '5': 29, '6': 30, '7': 31
};
var blocks = [0, 0, 0, 0, 0, 0, 0, 0];
var throwInvalidUtf8 = function (position, partial) {
if (partial.length > 10) {
partial = '...' + partial.substr(-10);
}
var err = new Error('Decoded data is not valid UTF-8.'
+ ' Maybe try base32.decode.asBytes()?'
+ ' Partial data after reading ' + position + ' bytes: ' + partial + ' <-');
err.position = position;
throw err;
};
var toUtf8String = function (bytes) {
var str = '', length = bytes.length, i = 0, followingChars = 0, b, c;
while (i < length) {
b = bytes[i++];
if (b <= 0x7F) {
str += String.fromCharCode(b);
continue;
} else if (b > 0xBF && b <= 0xDF) {
c = b & 0x1F;
followingChars = 1;
} else if (b <= 0xEF) {
c = b & 0x0F;
followingChars = 2;
} else if (b <= 0xF7) {
c = b & 0x07;
followingChars = 3;
} else {
throwInvalidUtf8(i, str);
}
for (var j = 0; j < followingChars; ++j) {
b = bytes[i++];
if (b < 0x80 || b > 0xBF) {
throwInvalidUtf8(i, str);
}
c <<= 6;
c += b & 0x3F;
}
if (c >= 0xD800 && c <= 0xDFFF) {
throwInvalidUtf8(i, str);
}
if (c > 0x10FFFF) {
throwInvalidUtf8(i, str);
}
if (c <= 0xFFFF) {
str += String.fromCharCode(c);
} else {
c -= 0x10000;
str += String.fromCharCode((c >> 10) + 0xD800);
str += String.fromCharCode((c & 0x3FF) + 0xDC00);
}
}
return str;
};
var decodeAsBytes = function (base32Str) {
if (base32Str === '') {
return [];
} else if (!/^[A-Z2-7=]+$/.test(base32Str)) {
throw new Error('Invalid base32 characters');
}
base32Str = base32Str.replace(/=/g, '');
var v1, v2, v3, v4, v5, v6, v7, v8, bytes = [], index = 0, length = base32Str.length;
// 4 char to 3 bytes
for (var i = 0, count = length >> 3 << 3; i < count;) {
v1 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v2 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v3 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v4 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v5 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v6 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v7 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v8 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
bytes[index++] = (v1 << 3 | v2 >>> 2) & 255;
bytes[index++] = (v2 << 6 | v3 << 1 | v4 >>> 4) & 255;
bytes[index++] = (v4 << 4 | v5 >>> 1) & 255;
bytes[index++] = (v5 << 7 | v6 << 2 | v7 >>> 3) & 255;
bytes[index++] = (v7 << 5 | v8) & 255;
}
// remain bytes
var remain = length - count;
if (remain === 2) {
v1 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v2 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
bytes[index++] = (v1 << 3 | v2 >>> 2) & 255;
} else if (remain === 4) {
v1 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v2 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v3 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v4 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
bytes[index++] = (v1 << 3 | v2 >>> 2) & 255;
bytes[index++] = (v2 << 6 | v3 << 1 | v4 >>> 4) & 255;
} else if (remain === 5) {
v1 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v2 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v3 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v4 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v5 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
bytes[index++] = (v1 << 3 | v2 >>> 2) & 255;
bytes[index++] = (v2 << 6 | v3 << 1 | v4 >>> 4) & 255;
bytes[index++] = (v4 << 4 | v5 >>> 1) & 255;
} else if (remain === 7) {
v1 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v2 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v3 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v4 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v5 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v6 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v7 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
bytes[index++] = (v1 << 3 | v2 >>> 2) & 255;
bytes[index++] = (v2 << 6 | v3 << 1 | v4 >>> 4) & 255;
bytes[index++] = (v4 << 4 | v5 >>> 1) & 255;
bytes[index++] = (v5 << 7 | v6 << 2 | v7 >>> 3) & 255;
}
return bytes;
};
var encodeAscii = function (str) {
var v1, v2, v3, v4, v5, base32Str = '', length = str.length;
for (var i = 0, count = parseInt(length / 5) * 5; i < count;) {
v1 = str.charCodeAt(i++);
v2 = str.charCodeAt(i++);
v3 = str.charCodeAt(i++);
v4 = str.charCodeAt(i++);
v5 = str.charCodeAt(i++);
base32Str += BASE32_ENCODE_CHAR[v1 >>> 3] +
BASE32_ENCODE_CHAR[(v1 << 2 | v2 >>> 6) & 31] +
BASE32_ENCODE_CHAR[(v2 >>> 1) & 31] +
BASE32_ENCODE_CHAR[(v2 << 4 | v3 >>> 4) & 31] +
BASE32_ENCODE_CHAR[(v3 << 1 | v4 >>> 7) & 31] +
BASE32_ENCODE_CHAR[(v4 >>> 2) & 31] +
BASE32_ENCODE_CHAR[(v4 << 3 | v5 >>> 5) & 31] +
BASE32_ENCODE_CHAR[v5 & 31];
}
// remain char
var remain = length - count;
if (remain === 1) {
v1 = str.charCodeAt(i);
base32Str += BASE32_ENCODE_CHAR[v1 >>> 3] +
BASE32_ENCODE_CHAR[(v1 << 2) & 31] +
'======';
} else if (remain === 2) {
v1 = str.charCodeAt(i++);
v2 = str.charCodeAt(i);
base32Str += BASE32_ENCODE_CHAR[v1 >>> 3] +
BASE32_ENCODE_CHAR[(v1 << 2 | v2 >>> 6) & 31] +
BASE32_ENCODE_CHAR[(v2 >>> 1) & 31] +
BASE32_ENCODE_CHAR[(v2 << 4) & 31] +
'====';
} else if (remain === 3) {
v1 = str.charCodeAt(i++);
v2 = str.charCodeAt(i++);
v3 = str.charCodeAt(i);
base32Str += BASE32_ENCODE_CHAR[v1 >>> 3] +
BASE32_ENCODE_CHAR[(v1 << 2 | v2 >>> 6) & 31] +
BASE32_ENCODE_CHAR[(v2 >>> 1) & 31] +
BASE32_ENCODE_CHAR[(v2 << 4 | v3 >>> 4) & 31] +
BASE32_ENCODE_CHAR[(v3 << 1) & 31] +
'===';
} else if (remain === 4) {
v1 = str.charCodeAt(i++);
v2 = str.charCodeAt(i++);
v3 = str.charCodeAt(i++);
v4 = str.charCodeAt(i);
base32Str += BASE32_ENCODE_CHAR[v1 >>> 3] +
BASE32_ENCODE_CHAR[(v1 << 2 | v2 >>> 6) & 31] +
BASE32_ENCODE_CHAR[(v2 >>> 1) & 31] +
BASE32_ENCODE_CHAR[(v2 << 4 | v3 >>> 4) & 31] +
BASE32_ENCODE_CHAR[(v3 << 1 | v4 >>> 7) & 31] +
BASE32_ENCODE_CHAR[(v4 >>> 2) & 31] +
BASE32_ENCODE_CHAR[(v4 << 3) & 31] +
'=';
}
return base32Str;
};
var encodeUtf8 = function (str) {
var v1, v2, v3, v4, v5, code, end = false, base32Str = '',
index = 0, i, start = 0, bytes = 0, length = str.length;
if (str === '') {
return base32Str;
}
do {
blocks[0] = blocks[5];
blocks[1] = blocks[6];
blocks[2] = blocks[7];
for (i = start; index < length && i < 5; ++index) {
code = str.charCodeAt(index);
if (code < 0x80) {
blocks[i++] = code;
} else if (code < 0x800) {
blocks[i++] = 0xc0 | (code >> 6);
blocks[i++] = 0x80 | (code & 0x3f);
} else if (code < 0xd800 || code >= 0xe000) {
blocks[i++] = 0xe0 | (code >> 12);
blocks[i++] = 0x80 | ((code >> 6) & 0x3f);
blocks[i++] = 0x80 | (code & 0x3f);
} else {
code = 0x10000 + (((code & 0x3ff) << 10) | (str.charCodeAt(++index) & 0x3ff));
blocks[i++] = 0xf0 | (code >> 18);
blocks[i++] = 0x80 | ((code >> 12) & 0x3f);
blocks[i++] = 0x80 | ((code >> 6) & 0x3f);
blocks[i++] = 0x80 | (code & 0x3f);
}
}
bytes += i - start;
start = i - 5;
if (index === length) {
++index;
}
if (index > length && i < 6) {
end = true;
}
v1 = blocks[0];
if (i > 4) {
v2 = blocks[1];
v3 = blocks[2];
v4 = blocks[3];
v5 = blocks[4];
base32Str += BASE32_ENCODE_CHAR[v1 >>> 3] +
BASE32_ENCODE_CHAR[(v1 << 2 | v2 >>> 6) & 31] +
BASE32_ENCODE_CHAR[(v2 >>> 1) & 31] +
BASE32_ENCODE_CHAR[(v2 << 4 | v3 >>> 4) & 31] +
BASE32_ENCODE_CHAR[(v3 << 1 | v4 >>> 7) & 31] +
BASE32_ENCODE_CHAR[(v4 >>> 2) & 31] +
BASE32_ENCODE_CHAR[(v4 << 3 | v5 >>> 5) & 31] +
BASE32_ENCODE_CHAR[v5 & 31];
} else if (i === 1) {
base32Str += BASE32_ENCODE_CHAR[v1 >>> 3] +
BASE32_ENCODE_CHAR[(v1 << 2) & 31] +
'======';
} else if (i === 2) {
v2 = blocks[1];
base32Str += BASE32_ENCODE_CHAR[v1 >>> 3] +
BASE32_ENCODE_CHAR[(v1 << 2 | v2 >>> 6) & 31] +
BASE32_ENCODE_CHAR[(v2 >>> 1) & 31] +
BASE32_ENCODE_CHAR[(v2 << 4) & 31] +
'====';
} else if (i === 3) {
v2 = blocks[1];
v3 = blocks[2];
base32Str += BASE32_ENCODE_CHAR[v1 >>> 3] +
BASE32_ENCODE_CHAR[(v1 << 2 | v2 >>> 6) & 31] +
BASE32_ENCODE_CHAR[(v2 >>> 1) & 31] +
BASE32_ENCODE_CHAR[(v2 << 4 | v3 >>> 4) & 31] +
BASE32_ENCODE_CHAR[(v3 << 1) & 31] +
'===';
} else {
v2 = blocks[1];
v3 = blocks[2];
v4 = blocks[3];
base32Str += BASE32_ENCODE_CHAR[v1 >>> 3] +
BASE32_ENCODE_CHAR[(v1 << 2 | v2 >>> 6) & 31] +
BASE32_ENCODE_CHAR[(v2 >>> 1) & 31] +
BASE32_ENCODE_CHAR[(v2 << 4 | v3 >>> 4) & 31] +
BASE32_ENCODE_CHAR[(v3 << 1 | v4 >>> 7) & 31] +
BASE32_ENCODE_CHAR[(v4 >>> 2) & 31] +
BASE32_ENCODE_CHAR[(v4 << 3) & 31] +
'=';
}
} while (!end);
return base32Str;
};
var encodeBytes = function (bytes) {
var v1, v2, v3, v4, v5, base32Str = '', length = bytes.length;
for (var i = 0, count = parseInt(length / 5) * 5; i < count;) {
v1 = bytes[i++];
v2 = bytes[i++];
v3 = bytes[i++];
v4 = bytes[i++];
v5 = bytes[i++];
base32Str += BASE32_ENCODE_CHAR[v1 >>> 3] +
BASE32_ENCODE_CHAR[(v1 << 2 | v2 >>> 6) & 31] +
BASE32_ENCODE_CHAR[(v2 >>> 1) & 31] +
BASE32_ENCODE_CHAR[(v2 << 4 | v3 >>> 4) & 31] +
BASE32_ENCODE_CHAR[(v3 << 1 | v4 >>> 7) & 31] +
BASE32_ENCODE_CHAR[(v4 >>> 2) & 31] +
BASE32_ENCODE_CHAR[(v4 << 3 | v5 >>> 5) & 31] +
BASE32_ENCODE_CHAR[v5 & 31];
}
// remain char
var remain = length - count;
if (remain === 1) {
v1 = bytes[i];
base32Str += BASE32_ENCODE_CHAR[v1 >>> 3] +
BASE32_ENCODE_CHAR[(v1 << 2) & 31] +
'======';
} else if (remain === 2) {
v1 = bytes[i++];
v2 = bytes[i];
base32Str += BASE32_ENCODE_CHAR[v1 >>> 3] +
BASE32_ENCODE_CHAR[(v1 << 2 | v2 >>> 6) & 31] +
BASE32_ENCODE_CHAR[(v2 >>> 1) & 31] +
BASE32_ENCODE_CHAR[(v2 << 4) & 31] +
'====';
} else if (remain === 3) {
v1 = bytes[i++];
v2 = bytes[i++];
v3 = bytes[i];
base32Str += BASE32_ENCODE_CHAR[v1 >>> 3] +
BASE32_ENCODE_CHAR[(v1 << 2 | v2 >>> 6) & 31] +
BASE32_ENCODE_CHAR[(v2 >>> 1) & 31] +
BASE32_ENCODE_CHAR[(v2 << 4 | v3 >>> 4) & 31] +
BASE32_ENCODE_CHAR[(v3 << 1) & 31] +
'===';
} else if (remain === 4) {
v1 = bytes[i++];
v2 = bytes[i++];
v3 = bytes[i++];
v4 = bytes[i];
base32Str += BASE32_ENCODE_CHAR[v1 >>> 3] +
BASE32_ENCODE_CHAR[(v1 << 2 | v2 >>> 6) & 31] +
BASE32_ENCODE_CHAR[(v2 >>> 1) & 31] +
BASE32_ENCODE_CHAR[(v2 << 4 | v3 >>> 4) & 31] +
BASE32_ENCODE_CHAR[(v3 << 1 | v4 >>> 7) & 31] +
BASE32_ENCODE_CHAR[(v4 >>> 2) & 31] +
BASE32_ENCODE_CHAR[(v4 << 3) & 31] +
'=';
}
return base32Str;
};
var encode = function (input, asciiOnly) {
var notString = typeof(input) !== 'string';
if (notString && input.constructor === ArrayBuffer) {
input = new Uint8Array(input);
}
if (notString) {
return encodeBytes(input);
} else if (asciiOnly) {
return encodeAscii(input);
} else {
return encodeUtf8(input);
}
};
var decode = function (base32Str, asciiOnly) {
if (!asciiOnly) {
return toUtf8String(decodeAsBytes(base32Str));
}
if (base32Str === '') {
return '';
} else if (!/^[A-Z2-7=]+$/.test(base32Str)) {
throw new Error('Invalid base32 characters');
}
var v1, v2, v3, v4, v5, v6, v7, v8, str = '', length = base32Str.indexOf('=');
if (length === -1) {
length = base32Str.length;
}
// 8 char to 5 bytes
for (var i = 0, count = length >> 3 << 3; i < count;) {
v1 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v2 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v3 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v4 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v5 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v6 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v7 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v8 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
str += String.fromCharCode((v1 << 3 | v2 >>> 2) & 255) +
String.fromCharCode((v2 << 6 | v3 << 1 | v4 >>> 4) & 255) +
String.fromCharCode((v4 << 4 | v5 >>> 1) & 255) +
String.fromCharCode((v5 << 7 | v6 << 2 | v7 >>> 3) & 255) +
String.fromCharCode((v7 << 5 | v8) & 255);
}
// remain bytes
var remain = length - count;
if (remain === 2) {
v1 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v2 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
str += String.fromCharCode((v1 << 3 | v2 >>> 2) & 255);
} else if (remain === 4) {
v1 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v2 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v3 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v4 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
str += String.fromCharCode((v1 << 3 | v2 >>> 2) & 255) +
String.fromCharCode((v2 << 6 | v3 << 1 | v4 >>> 4) & 255);
} else if (remain === 5) {
v1 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v2 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v3 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v4 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v5 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
str += String.fromCharCode((v1 << 3 | v2 >>> 2) & 255) +
String.fromCharCode((v2 << 6 | v3 << 1 | v4 >>> 4) & 255) +
String.fromCharCode((v4 << 4 | v5 >>> 1) & 255);
} else if (remain === 7) {
v1 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v2 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v3 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v4 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v5 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v6 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
v7 = BASE32_DECODE_CHAR[base32Str.charAt(i++)];
str += String.fromCharCode((v1 << 3 | v2 >>> 2) & 255) +
String.fromCharCode((v2 << 6 | v3 << 1 | v4 >>> 4) & 255) +
String.fromCharCode((v4 << 4 | v5 >>> 1) & 255) +
String.fromCharCode((v5 << 7 | v6 << 2 | v7 >>> 3) & 255);
}
return str;
};
var exports = {
encode: encode,
decode: decode
};
decode.asBytes = decodeAsBytes;
if (COMMON_JS) {
module.exports = exports;
} else {
root.base32 = exports;
if (AMD) {
define(function() {
return exports;
});
}
}
})();
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