/*
* Copyright (c) 2005, 2015, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code 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 General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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*/
package com.sun.imageio.plugins.tiff;
import java.io.IOException;
public class TIFFPackBitsDecompressor extends TIFFDecompressor {
public TIFFPackBitsDecompressor() {
}
public int decode(byte[] srcData, int srcOffset,
byte[] dstData, int dstOffset)
throws IOException {
int srcIndex = srcOffset;
int dstIndex = dstOffset;
int dstArraySize = dstData.length;
int srcArraySize = srcData.length;
try {
while (dstIndex < dstArraySize && srcIndex < srcArraySize) {
byte b = srcData[srcIndex++];
if (b >= 0 && b <= 127) {
// Literal run packet
for (int i = 0; i < b + 1; i++) {
dstData[dstIndex++] = srcData[srcIndex++];
}
} else if (b <= -1 && b >= -127) {
// 2-byte encoded run packet
byte repeat = srcData[srcIndex++];
for (int i = 0; i < (-b + 1); i++) {
dstData[dstIndex++] = repeat;
}
} else {
// No-op packet, do nothing
++srcIndex;
}
}
} catch(ArrayIndexOutOfBoundsException e) {
if(reader instanceof TIFFImageReader) {
((TIFFImageReader)reader).forwardWarningMessage
("ArrayIndexOutOfBoundsException ignored in TIFFPackBitsDecompressor.decode()");
}
}
return dstIndex - dstOffset;
}
public void decodeRaw(byte[] b,
int dstOffset,
int bitsPerPixel,
int scanlineStride) throws IOException {
stream.seek(offset);
byte[] srcData = new byte[byteCount];
stream.readFully(srcData);
int bytesPerRow = (srcWidth*bitsPerPixel + 7)/8;
byte[] buf;
int bufOffset;
if(bytesPerRow == scanlineStride) {
buf = b;
bufOffset = dstOffset;
} else {
buf = new byte[bytesPerRow*srcHeight];
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