com.mchange.lang.CharUtils Maven / Gradle / Ivy
/*
* Distributed as part of mchange-commons-java v.0.2.3
*
* Copyright (C) 2012 Machinery For Change, Inc.
*
* Author: Steve Waldman
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 2.1, as
* published by the Free Software Foundation.
*
* 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. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this software; see the file LICENSE. If not, write to the
* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307, USA.
*/
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()
{}
}