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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} &le; 0 or {@code outLen} &le; 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} &le; 0 or {@code outLen} &le; 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} &le; 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;
+ }
+
+}