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/**
* Copyright 2015 JogAmp Community. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are
* permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this list of
* conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice, this list
* of conditions and the following disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY JogAmp Community ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JogAmp Community OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* The views and conclusions contained in the software and documentation are those of the
* authors and should not be interpreted as representing official policies, either expressed
* or implied, of JogAmp Community.
*/
package com.jogamp.common.util;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.zip.DataFormatException;
import java.util.zip.Deflater;
import java.util.zip.Inflater;
/**
* All in memory inflater / deflator for small chunks using streams
* <p>
* Stream header of deflated data:
* <ul>
* <li>4 bytes magic 0xDEF1A7E0 (Big Endian)</li>
* <li>4 bytes integer deflated-size (Big Endian)</li>
* <li>4 bytes integer inflated-size (Big Endian)</li>
* <li>deflated bytes</li>
* </ul>
* </p>
*/
public class CustomCompress {
/** Start of stream header for deflated data */
public static final int MAGIC = 0xDEF1A7E0;
/**
*
* @param in {@link InputStream} at start of stream header, i.e. position {@link #MAGIC}.
* @return the inflated bytes from the stream
* @throws IOException if an I/O or deflation exception occurs
* @throws IllegalArgumentException if {@code inLen} ≤ 0 or {@code outLen} ≤ 0, as read from header
*/
public static byte[] inflateFromStream(final InputStream in)
throws IOException, ArrayIndexOutOfBoundsException, IllegalArgumentException
{
final int inLen;
final int outLen;
{
final DataInputStream din = new DataInputStream(in);
final int _magic = din.readInt();
if( _magic != MAGIC ) {
throw new IOException("wrong magic: "+Integer.toHexString(_magic)+", expected "+Integer.toHexString(MAGIC));
}
inLen = din.readInt();
outLen = din.readInt();
}
return inflateFromStream(in, inLen, outLen, new byte[outLen], 0);
}
/**
*
* @param in {@link InputStream} at start of deflated bytes, i.e. after the stream header.
* @param inLen number of deflated bytes in stream {@code in}
* @param outLen number of inflated {@code output} bytes at {@code outOff}
* @param output sink for deflated bytes
* @param outOff offset to {@code output}
* @return the inflated bytes from the stream, passing {@code output} for chaining
* @throws IOException if an I/O or deflation exception occurs
* @throws ArrayIndexOutOfBoundsException if {@code outOff} and {@code outLen} exceeds {@code output}
* @throws IllegalArgumentException if {@code inLen} ≤ 0 or {@code outLen} ≤ 0
*/
public static byte[] inflateFromStream(final InputStream in, final int inLen, final int outLen,
final byte[] output, final int outOff)
throws IOException, ArrayIndexOutOfBoundsException, IllegalArgumentException
{
if (inLen <= 0 || outLen <= 0 ) {
throw new IllegalArgumentException("Length[input "+inLen+", output "+outLen+"]");
}
if (outOff < 0 || output.length < outOff + outLen) {
throw new ArrayIndexOutOfBoundsException("output.length "+output.length+", offset "+outOff+", length "+outLen);
}
final byte[] input = new byte[inLen];
int numBytes = 0;
try {
while (true) {
final int remBytes = inLen - numBytes;
int count;
if ( 0 >= remBytes || (count = in.read(input, numBytes, remBytes)) == -1 ) {
break;
}
numBytes += count;
}
} finally {
in.close();
}
if( inLen != numBytes ) {
throw new IOException("Got "+numBytes+" bytes != expected "+inLen);
}
try {
final Inflater inflater = new Inflater();
inflater.setInput(input, 0, inLen);
final int outSize = inflater.inflate(output, outOff, outLen);
inflater.end();
if( outLen != outSize ) {
throw new IOException("Got inflated "+outSize+" bytes != expected "+outLen);
}
} catch(final DataFormatException dfe) {
throw new IOException(dfe);
}
return output;
}
/**
* @param input raw input bytes
* @param inOff offset to {@code input}
* @param inLen number of {@code input} bytes at {@code inOff}
* @param level compression level 0-9 or {@link Deflater#DEFAULT_COMPRESSION}
* @param out sink for deflated bytes
* @return number of deflated bytes written, not including the header.
* @throws IOException if an I/O or deflation exception occurs
* @throws ArrayIndexOutOfBoundsException if {@code inOff} and {@code inLen} exceeds {@code input}
* @throws IllegalArgumentException if {@code inLen} ≤ 0
*/
public static int deflateToStream(final byte[] input, final int inOff, final int inLen,
final int level, final OutputStream out) throws IOException, ArrayIndexOutOfBoundsException, IllegalArgumentException {
if (inLen <= 0 ) {
throw new IllegalArgumentException("Length[input "+inLen+"]");
}
if (inOff < 0 || input.length < inOff + inLen) {
throw new ArrayIndexOutOfBoundsException("input.length "+input.length+", offset "+inOff+", length "+inLen);
}
final byte[] output = new byte[inLen];
final Deflater deflater = new Deflater(level);
deflater.setInput(input, inOff, inLen);
deflater.finish();
final int outSize = deflater.deflate(output, 0, inLen);
deflater.end();
{
final DataOutputStream dout = new DataOutputStream(out);
dout.writeInt(CustomCompress.MAGIC);
dout.writeInt(outSize);
dout.writeInt(inLen);
}
out.write(output, 0, outSize);
return outSize;
}
}
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