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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* $Id$ */
package org.apache.fop.render.afp.tools;
import java.io.ByteArrayOutputStream;
/**
* Library of utility useful conversion methods.
*
*/
public final class BinaryUtils {
/**
* Convert an int into the corresponding byte array by encoding each
* two hexadecimal digits as a char. This will return a byte array
* to the length specified by bufsize.
* @param integer The int representation.
* @param bufsize The required byte array size.
*/
public static byte[] convert(int integer, int bufsize) {
StringBuffer buf = new StringBuffer(Integer.toHexString(integer));
if (buf.length() % 2 == 0) {
// Ignore even number of digits
} else {
// Convert to an even number of digits
buf.insert(0, "0");
}
int size = buf.length() / 2;
while (size < bufsize) {
buf.insert(0, "00");
size++;
};
return convert(buf.toString());
}
/**
* Convert an int into the corresponding byte array by encoding each
* two hexadecimal digits as a char.
* @param integer The int representation
*/
public static byte[] convert(int integer) {
return convert(Integer.toHexString(integer));
}
/**
* Convert a String of hexadecimal digits into the corresponding
* byte array by encoding each two hexadecimal digits as a byte.
* @param digits The hexadecimal digits representation.
*/
public static byte[] convert(String digits) {
if (digits.length() % 2 == 0) {
// Even number of digits, so ignore
} else {
// Convert to an even number of digits
digits = "0" + digits;
}
ByteArrayOutputStream baos = new ByteArrayOutputStream();
for (int i = 0; i < digits.length(); i += 2) {
char c1 = digits.charAt(i);
char c2 = digits.charAt(i + 1);
byte b = 0;
if ((c1 >= '0') && (c1 <= '9'))
b += ((c1 - '0') * 16);
else if ((c1 >= 'a') && (c1 <= 'f'))
b += ((c1 - 'a' + 10) * 16);
else if ((c1 >= 'A') && (c1 <= 'F'))
b += ((c1 - 'A' + 10) * 16);
else
throw new IllegalArgumentException("Bad hexadecimal digit");
if ((c2 >= '0') && (c2 <= '9'))
b += (c2 - '0');
else if ((c2 >= 'a') && (c2 <= 'f'))
b += (c2 - 'a' + 10);
else if ((c2 >= 'A') && (c2 <= 'F'))
b += (c2 - 'A' + 10);
else
throw new IllegalArgumentException("Bad hexadecimal digit");
baos.write(b);
}
return (baos.toByteArray());
}
/**
* Convert the specified short into a byte array.
* @param value The value to be converted.
* @param array The array to receive the data.
* @param offset The offset into the byte array for the start of the value.
*/
public static void shortToByteArray(
short value,
byte[] array,
int offset) {
array[offset] = (byte) (value >>> 8);
array[offset + 1] = (byte) value;
}
/**
* Convert the specified short into a byte array.
* @param value The value to be converted.
* @return The byte array
*/
public static byte[] shortToByteArray(short value) {
byte[] serverValue = new byte[2];
shortToByteArray(value, serverValue, 0);
return serverValue;
}
}
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