/*
* This program 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.
*
* You should have received a copy of the GNU Lesser General Public License along with this
* program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* or from the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* This program 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.
*
* Copyright (c) 2006 - 2013 Pentaho Corporation and Contributors. All rights reserved.
*/
package org.pentaho.reporting.libraries.fonts;
import org.pentaho.reporting.libraries.fonts.encoding.ByteBuffer;
import org.pentaho.reporting.libraries.fonts.encoding.CodePointBuffer;
import org.pentaho.reporting.libraries.fonts.encoding.Encoding;
import org.pentaho.reporting.libraries.fonts.encoding.EncodingException;
import org.pentaho.reporting.libraries.fonts.encoding.EncodingRegistry;
import org.pentaho.reporting.libraries.fonts.encoding.manual.Utf16LE;
/**
* Reads byte-data using a Big-Endian access schema. Big-Endian is used for TrueType fonts.
*
* @author Thomas Morgner
*/
public class ByteAccessUtilities
{
private ByteAccessUtilities()
{
}
public static int readUShort (final byte[] data, final int pos)
{
return ((data[pos] & 0xff) << 8) | (data[pos + 1] & 0xff);
}
public static long readULong (final byte[] data, final int pos)
{
final int c1 = (data[pos] & 0xff);
final int c2 = (data[pos + 1] & 0xff);
final int c3 = (data[pos + 2] & 0xff);
final int c4 = (data[pos + 3] & 0xff);
long retval = ((long) c1 << 24);
retval |= (long)c2 << 16;
retval |= (long)c3 << 8;
retval |= (long)c4;
return retval;
}
public static float readFixed (final byte[] data, final int pos)
{
final short mantissa = readShort(data, pos);
final int fraction = readUShort(data, pos + 2);
if (fraction == 0 || mantissa == 0)
{
return 0;
}
return (float) mantissa / (fraction / 16384.0f);
}
public static long readLongDateTime (final byte[] data, final int pos)
{
final int c1 = (data[pos] & 0xff);
final int c2 = (data[pos + 1] & 0xff);
final int c3 = (data[pos + 2] & 0xff);
final int c4 = (data[pos + 3] & 0xff);
final int c5 = (data[pos + 4] & 0xff);
final int c6 = (data[pos + 5] & 0xff);
final int c7 = (data[pos + 6] & 0xff);
final int c8 = (data[pos + 7] & 0xff);
long retval = ((long) c1 << 56);
retval |= (long)c2 << 48;
retval |= (long)c3 << 40;
retval |= (long)c4 << 32;
retval |= (long)c5 << 24;
retval |= (long)c6 << 16;
retval |= (long)c7 << 8;
retval |= (long)c8;
return retval;
}
public static byte[] readBytes (final byte[] data,
final int pos, final int length)
{
final byte[] retval = new byte[length];
System.arraycopy(data, pos, retval, 0, length);
return retval;
}
public static short readShort (final byte[] data, final int pos)
{
return (short) ((data[pos] & 0xff) << 8 | (data[pos + 1] & 0xff));
}
public static int readLong (final byte[] data, final int pos)
{
int retval = 0;
retval |= (long)(data[pos] & 0xff) << 24;
retval |= (long)(data[pos + 1] & 0xff) << 16;
retval |= (long)(data[pos + 2] & 0xff) << 8;
retval |= (long)(data[pos + 3] & 0xff);
return retval;
}
public static int readZStringOffset (final byte[] data, final int pos, final int maxLength)
{
final int lastPos = Math.min (pos + maxLength, pos + data.length);
for (int i = pos; i < lastPos; i++)
{
if (data[i] == 0)
{
return i;
}
}
return lastPos;
}
public static String readZString (final byte[] data, final int pos, final int maxLength, final String encoding)
throws EncodingException
{
final int lastPos = Math.min (pos + maxLength, pos + data.length);
for (int i = pos; i < lastPos; i++)
{
if (data[i] == 0)
{
return readString(data, pos, i - pos, encoding);
}
}
return readString(data, pos, lastPos, encoding);
}
public static String readString (final byte[] data, final int pos,
final int length, final String encoding)
throws EncodingException
{
final Encoding enc;
if ("UTF-16".equals(encoding))
{
enc = EncodingRegistry.getInstance().getEncoding("UTF-16LE");
}
else
{
enc = EncodingRegistry.getInstance().getEncoding(encoding);
}
final ByteBuffer byteBuffer = new ByteBuffer(data, pos, length);
final CodePointBuffer cp = enc.decode(byteBuffer, null);
return Utf16LE.getInstance().encodeString(cp);
}
}