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JavaScript generic ASN.1 parser (mirror)
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475// Hex JavaScript decoder// Copyright (c) 2008-2022 Lapo Luchini <lapo@lapo.it>
// Permission to use, copy, modify, and/or distribute this software for any// purpose with or without fee is hereby granted, provided that the above// copyright notice and this permission notice appear in all copies.// // THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
(typeof define != 'undefined' ? define : function (factory) { 'use strict'; if (typeof module == 'object') module.exports = factory(); else window.hex = factory();})(function () {"use strict";
var Hex = {}, decoder, // populated on first usage haveU8 = (typeof Uint8Array == 'function');
/** * Decodes an hexadecimal value. * @param {string|Array|Uint8Array} a - a string representing hexadecimal data, or an array representation of its charcodes */Hex.decode = function(a) { var isString = (typeof a == 'string'); var i; if (decoder === undefined) { var hex = "0123456789ABCDEF", ignore = " \f\n\r\t\u00A0\u2028\u2029"; decoder = []; for (i = 0; i < 16; ++i) decoder[hex.charCodeAt(i)] = i; hex = hex.toLowerCase(); for (i = 10; i < 16; ++i) decoder[hex.charCodeAt(i)] = i; for (i = 0; i < ignore.length; ++i) decoder[ignore.charCodeAt(i)] = -1; } var out = haveU8 ? new Uint8Array(a.length >> 1) : [], bits = 0, char_count = 0, len = 0; for (i = 0; i < a.length; ++i) { var c = isString ? a.charCodeAt(i) : a[i]; c = decoder[c]; if (c == -1) continue; if (c === undefined) throw 'Illegal character at offset ' + i; bits |= c; if (++char_count >= 2) { out[len++] = bits; bits = 0; char_count = 0; } else { bits <<= 4; } } if (char_count) throw "Hex encoding incomplete: 4 bits missing"; if (haveU8 && out.length > len) // in case it was originally longer because of ignored characters out = out.subarray(0, len); return out;};
return Hex;
});