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Просмотр файла: hex.js
"use strict";
// Copyright (C) 2016 Dmitry Chestnykh
// MIT License. See LICENSE file for details.
Object.defineProperty(exports, "__esModule", { value: true });
/**
* Package hex implements hex encoder and decoder.
*/
// 0123456789 ABCDEF | abcdef
// Index: 0 - 9 10-15 | 10-15
// ASCII: 48 - 57 65-70 | 97-102
function encodeNibble(b) {
// b >= 0
var result = b + 48;
// b > 9
result += ((9 - b) >>> 8) & (-48 + 65 - 10);
return String.fromCharCode(result);
}
function encodeNibbleLower(b) {
// b >= 0
var result = b + 48;
// b > 9
result += ((9 - b) >>> 8) & (-48 + 97 - 10);
return String.fromCharCode(result);
}
// Invalid character used in decoding to indicate
// that the character to decode is out of range of
// hex alphabet and cannot be decoded.
var INVALID_HEX_NIBBLE = 256;
function decodeNibble(c) {
var result = INVALID_HEX_NIBBLE;
// 0-9: c > 47 and c < 58
result += (((47 - c) & (c - 58)) >> 8) & (-INVALID_HEX_NIBBLE + c - 48);
// A-F: c > 64 and c < 71
result += (((64 - c) & (c - 71)) >> 8) & (-INVALID_HEX_NIBBLE + c - 65 + 10);
// a-f: c > 96 and c < 103
result += (((96 - c) & (c - 103)) >> 8) & (-INVALID_HEX_NIBBLE + c - 97 + 10);
return result;
}
/**
* Returns string with hex-encoded data.
*/
function encode(data, lowerCase) {
if (lowerCase === void 0) { lowerCase = false; }
var enc = lowerCase ? encodeNibbleLower : encodeNibble;
var s = "";
for (var i = 0; i < data.length; i++) {
s += enc(data[i] >>> 4);
s += enc(data[i] & 0x0f);
}
return s;
}
exports.encode = encode;
/**
* Returns Uint8Array with data decoded from hex string.
*
* Throws error if hex string length is not divisible by 2 or has non-hex
* characters.
*/
function decode(hex) {
if (hex.length === 0) {
return new Uint8Array(0);
}
if (hex.length % 2 !== 0) {
throw new Error("hex: input string must be divisible by two");
}
var result = new Uint8Array(hex.length / 2);
var haveBad = 0;
for (var i = 0; i < hex.length; i += 2) {
var v0 = decodeNibble(hex.charCodeAt(i));
var v1 = decodeNibble(hex.charCodeAt(i + 1));
result[i / 2] = v0 << 4 | v1;
haveBad |= v0 & INVALID_HEX_NIBBLE;
haveBad |= v1 & INVALID_HEX_NIBBLE;
}
if (haveBad !== 0) {
throw new Error("hex: incorrect characters for decoding");
}
return result;
}
exports.decode = decode;
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