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