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// util.js
// Tim Hughes <tim@twistedfury.com>
/*jslint node: true, shadow:true */
"use strict";
function nibbleToChar(nibble)
{
return String.fromCharCode((nibble < 10 ? 48 : 87) + nibble);
}
function charToNibble(chr)
{
if (chr >= 48 && chr <= 57)
{
return chr - 48;
}
if (chr >= 65 && chr <= 70)
{
return chr - 65 + 10;
}
if (chr >= 97 && chr <= 102)
{
return chr - 97 + 10;
}
return 0;
}
function stringToBytes(str)
{
var bytes = new Uint8Array(str.length);
for (var i = 0; i != str.length; ++i)
{
bytes[i] = str.charCodeAt(i);
}
return bytes;
}
function hexStringToBytes(str)
{
var bytes = new Uint8Array(str.length>>>1);
for (var i = 0; i != bytes.length; ++i)
{
bytes[i] = charToNibble(str.charCodeAt(i<<1 | 0)) << 4;
bytes[i] |= charToNibble(str.charCodeAt(i<<1 | 1));
}
return bytes;
}
function bytesToHexString(bytes)
{
var str = "";
for (var i = 0; i != bytes.length; ++i)
{
str += nibbleToChar(bytes[i] >>> 4);
str += nibbleToChar(bytes[i] & 0xf);
}
return str;
}
function wordsToHexString(words)
{
return bytesToHexString(new Uint8Array(words.buffer));
}
function uint32ToHexString(num)
{
var buf = new Uint8Array(4);
buf[0] = (num >> 24) & 0xff;
buf[1] = (num >> 16) & 0xff;
buf[2] = (num >> 8) & 0xff;
buf[3] = (num >> 0) & 0xff;
return bytesToHexString(buf);
}
function toWords(input)
{
if (input instanceof Uint32Array)
{
return input;
}
else if (input instanceof Uint8Array)
{
var tmp = new Uint8Array((input.length + 3) & ~3);
tmp.set(input);
return new Uint32Array(tmp.buffer);
}
else if (typeof input === typeof "")
{
return toWords(stringToBytes(input));
}
return null;
}
exports.stringToBytes = stringToBytes;
exports.hexStringToBytes = hexStringToBytes;
exports.bytesToHexString = bytesToHexString;
exports.wordsToHexString = wordsToHexString;
exports.uint32ToHexString = uint32ToHexString;
exports.toWords = toWords;