com.mchange.lang.CharUtils Maven / Gradle / Ivy
/*
* Distributed as part of mchange-commons-java 0.2.11
*
* Copyright (C) 2015 Machinery For Change, Inc.
*
* Author: Steve Waldman
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of EITHER:
*
* 1) The GNU Lesser General Public License (LGPL), version 2.1, as
* published by the Free Software Foundation
*
* OR
*
* 2) The Eclipse Public License (EPL), version 1.0
*
* You may choose which license to accept if you wish to redistribute
* or modify this work. You may offer derivatives of this work
* under the license you have chosen, or you may provide the same
* choice of license which you have been offered here.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* You should have received copies of both LGPL v2.1 and EPL v1.0
* along with this software; see the files LICENSE-EPL and LICENSE-LGPL.
* If not, the text of these licenses are currently available at
*
* LGPL v2.1: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* EPL v1.0: http://www.eclipse.org/org/documents/epl-v10.php
*
*/
package com.mchange.lang;
import java.io.StringWriter;
public final class CharUtils
{
public static int charFromByteArray(byte[] bytes, int offset)
{
int out = 0;
out |= ((int) ByteUtils.toUnsigned(bytes[offset + 0])) << 8;
out |= ((int) ByteUtils.toUnsigned(bytes[offset + 1])) << 0;
return out;
}
public static byte[] byteArrayFromChar(char i)
{
byte[] out = new byte[2];
charIntoByteArray(i, 0, out);
return out;
}
public static void charIntoByteArray(int i, int offset, byte[] bytes)
{
bytes[offset + 0] = (byte) ((i >>> 8) & 0xFF);
bytes[offset + 1] = (byte) ((i >>> 0) & 0xFF);
}
public static String toHexAscii(char c)
{
StringWriter sw = new StringWriter(4);
ByteUtils.addHexAscii((byte) ((c >>> 8) & 0xFF), sw);
ByteUtils.addHexAscii((byte) (c & 0xFF), sw);
return sw.toString();
}
public static char[] fromHexAscii( String s )
{
int len = s.length();
if ((len % 4) != 0)
throw new NumberFormatException("Hex ascii must be exactly four digits per char.");
byte[] bytes = ByteUtils.fromHexAscii( s );
int out_len = len / 4;
char[] out = new char[out_len];
for (int i = 0; len < out_len; ++i)
out[i] = (char) charFromByteArray( bytes, (i * 2) );
return out;
}
private CharUtils()
{}
}