package org.red5.io.utils;
/*
* RED5 Open Source Flash Server - http://www.osflash.org/red5
*
* Copyright (c) 2006-2009 by respective authors (see below). All rights reserved.
*
* This library is free software; you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License as published by the Free Software
* Foundation; either version 2.1 of the License, or (at your option) any later
* version.
*
* This library 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 library; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
import org.apache.mina.common.ByteBuffer;
/**
* Buffer Utility class which reads/writes intergers to the input/output buffer
*
* @author The Red5 Project (red5@osflash.org)
* @author Luke Hubbard, Codegent Ltd (luke@codegent.com)
*/
public class BufferUtils {
/**
* Writes a Medium Int to the output buffer
*
* @param out Container to write to
* @param value Integer to write
*/
public static void writeMediumInt(ByteBuffer out, int value) {
byte[] bytes = new byte[3];
bytes[0] = (byte) ((value >>> 16) & 0x000000FF);
bytes[1] = (byte) ((value >>> 8) & 0x000000FF);
bytes[2] = (byte) (value & 0x00FF);
out.put(bytes);
}
/**
* Reads an unsigned Medium Int from the in buffer
*
* @param in Source
* @return int Integer value
*/
public static int readUnsignedMediumInt(ByteBuffer in) {
byte[] bytes = new byte[3];
in.get(bytes);
int val = 0;
val += (bytes[0] & 0xFF) * 256 * 256;
val += (bytes[1] & 0xFF) * 256;
val += (bytes[2] & 0xFF);
return val;
}
/**
* Reads a Medium Int to the in buffer
*
* @param in Source
* @return int Medium int
*/
public static int readMediumInt(ByteBuffer in) {
byte[] bytes = new byte[3];
in.get(bytes);
int val = 0;
val += bytes[0] * 256 * 256;
val += bytes[1] * 256;
val += bytes[2];
if (val < 0) {
val += 256;
}
return val;
}
/**
* Puts input buffer stream to output buffer
* and returns number of bytes written
* @param out Output buffer
* @param in Input buffer
* @param numBytesMax Number of bytes max
* @return int Number of bytes written
*/
public static int put(ByteBuffer out, ByteBuffer in, int numBytesMax) {
final int limit = in.limit();
final int numBytesRead = (numBytesMax > in.remaining()) ? in
.remaining() : numBytesMax;
in.limit(in.position() + numBytesRead);
out.put(in);
in.limit(limit);
return numBytesRead;
}
}