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/*
* Copyright (c) 2016, Harald Kuhr
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* * 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.
*
* * Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 THE COPYRIGHT HOLDER 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.
*/
package com.twelvemonkeys.imageio.plugins.tiff;
import java.io.FilterInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import static com.twelvemonkeys.lang.Validate.notNull;
/**
* BitPaddingStream.
*
* @author Harald Kuhr
* @author last modified by $Author: harald.kuhr$
* @version $Id: Foo.java,v 1.0 15/11/2016 harald.kuhr Exp$
*/
final class BitPaddingStream extends FilterInputStream {
// Bit masks 0 - 32 bits
private static final int[] MASK = {
0x0,
0x1, 0x3, 0x7, 0xf,
0x1f, 0x3f, 0x7f, 0xff,
0x1ff, 0x3ff, 0x7ff, 0xfff,
0x1fff, 0x3fff, 0x7fff, 0xffff,
0x1ffff, 0x3ffff, 0x7ffff, 0xfffff,
0x1fffff, 0x3fffff, 0x7fffff, 0xffffff,
0x1ffffff, 0x3ffffff, 0x7ffffff, 0xfffffff,
0x1fffffff, 0x3fffffff, 0x7fffffff, 0xffffffff
};
private final int bitsPerSample;
private final byte[] inputBuffer;
private final ByteBuffer buffer;
private int componentSize;
BitPaddingStream(final InputStream stream, int samplesPerPixel, final int bitsPerSample, final int colsInTile, final ByteOrder byteOrder) {
super(notNull(stream, "stream"));
this.bitsPerSample = bitsPerSample;
notNull(byteOrder, "byteOrder");
switch (bitsPerSample) {
case 2:
case 4:
case 6:
// Byte
componentSize = 1;
break;
case 10:
case 12:
case 14:
// Short
componentSize = 2;
break;
case 18:
case 20:
case 22:
case 24:
case 26:
case 28:
case 30:
// Int
componentSize = 4;
break;
default:
throw new IllegalArgumentException("Unsupported BitsPerSample value: " + bitsPerSample);
}
int rowByteLength = (samplesPerPixel * bitsPerSample * colsInTile + 7) / 8;
inputBuffer = new byte[rowByteLength];
int rowLength = samplesPerPixel * colsInTile * componentSize;
buffer = ByteBuffer.allocate(rowLength);
buffer.order(byteOrder);
buffer.position(buffer.limit()); // Make sure we start by filling the buffer
}
@Override
public int read() throws IOException {
if (!buffer.hasRemaining()) {
if (!fillBuffer()) {
return -1;
}
}
return buffer.get() & 0xff;
}
private boolean readFully(final byte[] bytes) throws IOException {
int rest = bytes.length;
while (rest > 0) {
int read = in.read(bytes, bytes.length - rest, rest);
if (read == -1) {
// NOTE: If we did a partial read here, we are in trouble...
// Most likely an EOFException will happen up-stream
return false;
}
rest -= read;
}
return true;
}
@Override
public int read(final byte[] b, final int off, final int len) throws IOException {
if (!buffer.hasRemaining()) {
if (!fillBuffer()) {
return -1;
}
}
int length = Math.min(len, buffer.remaining());
buffer.get(b, off, length);
return length;
}
@Override
public long skip(final long n) throws IOException {
if (n <= 0) {
return 0;
}
if (!buffer.hasRemaining()) {
if (!fillBuffer()) {
return 0;
}
}
int length = (int) Math.min(n, buffer.remaining());
buffer.position(buffer.position() + length);
return length;
}
private boolean fillBuffer() throws IOException {
if (!readFully(inputBuffer)) {
return false;
}
buffer.clear();
padBits(buffer, componentSize, bitsPerSample, inputBuffer);
buffer.rewind();
return true;
}
private void padBits(final ByteBuffer buffer, final int componentSize, final int bitsPerSample, final byte[] samples) {
int offset = 0;
int remainingBits = 0;
int temp = 0;
while (true) {
int value = temp & MASK[remainingBits];
// Read smallest number of bytes > bits
while (remainingBits < bitsPerSample) {
if (offset >= samples.length) {
// End of data
return;
}
temp = samples[offset++] & 0xff;
value = value << 8 | temp;
remainingBits += 8;
}
remainingBits -= bitsPerSample;
value = (value >> remainingBits) & MASK[bitsPerSample];
switch (componentSize) {
case 1:
buffer.put((byte) value);
break;
case 2:
buffer.putShort((short) value);
break;
case 4:
buffer.putInt(value);
break;
default:
// Guarded in constructor
throw new AssertionError();
}
}
}
}
