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/**
* Copyright 2014 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.nio;
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.ByteBuffer;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.channels.FileChannel.MapMode;
/**
* An {@link InputStream} implementation based on an underlying {@link ByteBuffer}
* supporting {@link #markSupported() mark}.
* <p>
* May be utilized as well with a {@link MappedByteBuffer memory-mapped} {@link FileChannel#map(MapMode, long, long) FileChannel}
* using a size ≤ {@link Integer#MAX_VALUE}.<br>
* This becomes efficient with files ≥ 10 MiB, depending on the platform
* and whether the traditional method uses a {@link BufferedInputStream} supporting {@code mark} incl. it's buffer size.<br>
* See test case {@code com.jogamp.common.nio.TestByteBufferInputStream}.
* </p>
* @since 2.3.0
*/
public class ByteBufferInputStream extends InputStream {
private final ByteBuffer buf;
private int mark;
/**
* Creates a new byte-buffer input stream.
*
* @param buf the underlying byte buffer.
*/
public ByteBufferInputStream(final ByteBuffer buf) {
this.buf = buf;
this.mark = -1;
}
@Override
public final int available() {
return buf.remaining();
}
/**
* <i>This implementation supports {@code mark}.</i>
* <p>
* {@inheritDoc}
* </p>
*/
@Override
public final boolean markSupported() {
return true;
}
/**
* <i>This implementation supports {@code mark}.</i>
* <p>
* {@inheritDoc}
* </p>
* @see #markSupported()
*/
@Override
public final synchronized void mark(final int unused) {
mark = buf.position();
}
/**
* <i>This implementation supports {@code mark}.</i>
* <p>
* {@inheritDoc}
* </p>
* @see #markSupported()
*/
@Override
public final synchronized void reset() throws IOException {
if ( mark == -1 ) {
throw new IOException();
}
buf.position(mark);
}
@Override
public final long skip(final long n) throws IOException {
if( 0 > n ) {
return 0;
}
final int s = (int) Math.min( buf.remaining(), n );
buf.position(buf.position() + s);
return s;
}
@Override
public final int read() {
if ( ! buf.hasRemaining() ) {
return -1;
}
return buf.get() & 0xFF;
}
@Override
public final int read(final byte[] b, final int off, final int len) {
if (b == null) {
throw new NullPointerException();
} else if (off < 0 || len < 0 || len > b.length - off) {
throw new IndexOutOfBoundsException("offset "+off+", length "+len+", b.length "+b.length);
}
if ( 0 == len ) {
return 0;
}
final int totalRem = buf.remaining();
if ( 0 == totalRem ) {
return -1;
}
final int maxLen = Math.min(totalRem, len);
if( buf.hasArray() ) {
System.arraycopy(buf.array(), buf.arrayOffset() + buf.position(), b, off, maxLen);
buf.position( buf.position() + maxLen );
} else {
buf.get(b, off, maxLen);
}
return maxLen;
}
// @Override
public final int read(final ByteBuffer b, final int len) {
if (b == null) {
throw new NullPointerException();
} else if (len < 0 || len > b.remaining()) {
throw new IndexOutOfBoundsException("length "+len+", b "+b);
}
if ( 0 == len ) {
return 0;
}
final int remaining = buf.remaining();
if ( 0 == remaining ) {
return -1;
}
final int maxLen = Math.min(remaining, len);
if( buf.hasArray() && b.hasArray() ) {
System.arraycopy(buf.array(), buf.arrayOffset() + buf.position(), b.array(), b.arrayOffset() + b.position(), maxLen);
buf.position( buf.position() + maxLen );
b.position( b.position() + maxLen );
} else if( maxLen == remaining ) {
b.put(buf);
} else {
final int _limit = buf.limit();
buf.limit(maxLen);
try {
b.put(buf);
} finally {
buf.limit(_limit);
}
}
return maxLen;
}
public final ByteBuffer getBuffer() { return buf; }
}
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