@proton/ccxt
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A JavaScript / TypeScript / Python / C# / PHP cryptocurrency trading library with support for 130+ exchanges
71 lines (68 loc) • 2.58 kB
JavaScript
// ----------------------------------------------------------------------------
// PLEASE DO NOT EDIT THIS FILE, IT IS GENERATED AND WILL BE OVERWRITTEN:
// https://github.com/ccxt/ccxt/blob/master/CONTRIBUTING.md#how-to-contribute-code
// EDIT THE CORRESPONDENT .ts FILE INSTEAD
// Hex JavaScript decoder
// Copyright (c) 2008-2013 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.
/*jshint browser: true, strict: true, immed: true, latedef: true, undef: true, regexdash: false */
let decoder;
export const Hex = {
decode(a) {
let i;
if (decoder === undefined) {
let hex = "0123456789ABCDEF";
const ignore = " \f\n\r\t\u00A0\u2028\u2029";
decoder = {};
for (i = 0; i < 16; ++i) {
decoder[hex.charAt(i)] = i;
}
hex = hex.toLowerCase();
for (i = 10; i < 16; ++i) {
decoder[hex.charAt(i)] = i;
}
for (i = 0; i < ignore.length; ++i) {
decoder[ignore.charAt(i)] = -1;
}
}
const out = [];
let bits = 0;
let char_count = 0;
for (i = 0; i < a.length; ++i) {
let c = a.charAt(i);
if (c == "=") {
break;
}
c = decoder[c];
if (c == -1) {
continue;
}
if (c === undefined) {
throw new Error("Illegal character at offset " + i);
}
bits |= c;
if (++char_count >= 2) {
out[out.length] = bits;
bits = 0;
char_count = 0;
}
else {
bits <<= 4;
}
}
if (char_count) {
throw new Error("Hex encoding incomplete: 4 bits missing");
}
return out;
}
};