001: /*
002: * $RCSfile: TIFFPackBitsDecompressor.java,v $
003: *
004: *
005: * Copyright (c) 2005 Sun Microsystems, Inc. All Rights Reserved.
006: *
007: * Redistribution and use in source and binary forms, with or without
008: * modification, are permitted provided that the following conditions
009: * are met:
010: *
011: * - Redistribution of source code must retain the above copyright
012: * notice, this list of conditions and the following disclaimer.
013: *
014: * - Redistribution in binary form must reproduce the above copyright
015: * notice, this list of conditions and the following disclaimer in
016: * the documentation and/or other materials provided with the
017: * distribution.
018: *
019: * Neither the name of Sun Microsystems, Inc. or the names of
020: * contributors may be used to endorse or promote products derived
021: * from this software without specific prior written permission.
022: *
023: * This software is provided "AS IS," without a warranty of any
024: * kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
025: * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
026: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY
027: * EXCLUDED. SUN MIDROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL
028: * NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF
029: * USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
030: * DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR
031: * ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
032: * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
033: * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
034: * INABILITY TO USE THIS SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
035: * POSSIBILITY OF SUCH DAMAGES.
036: *
037: * You acknowledge that this software is not designed or intended for
038: * use in the design, construction, operation or maintenance of any
039: * nuclear facility.
040: *
041: * $Revision: 1.1 $
042: * $Date: 2005/02/11 05:01:49 $
043: * $State: Exp $
044: */
045: package com.sun.media.imageioimpl.plugins.tiff;
046:
047: import java.awt.Rectangle;
048: import java.io.IOException;
049: import javax.imageio.ImageReader;
050: import com.sun.media.imageio.plugins.tiff.BaselineTIFFTagSet;
051: import com.sun.media.imageio.plugins.tiff.TIFFDecompressor;
052: import com.sun.media.imageio.plugins.tiff.TIFFTag;
053:
054: public class TIFFPackBitsDecompressor extends TIFFDecompressor {
055:
056: private static final boolean DEBUG = false;
057:
058: public TIFFPackBitsDecompressor() {
059: }
060:
061: public int decode(byte[] srcData, int srcOffset, byte[] dstData,
062: int dstOffset) throws IOException {
063:
064: int srcIndex = srcOffset;
065: int dstIndex = dstOffset;
066:
067: int dstArraySize = dstData.length;
068: int srcArraySize = srcData.length;
069: try {
070: while (dstIndex < dstArraySize && srcIndex < srcArraySize) {
071: byte b = srcData[srcIndex++];
072:
073: if (b >= 0 && b <= 127) { // second test not needed?
074: // Literal run packet
075:
076: for (int i = 0; i < b + 1; i++) {
077: dstData[dstIndex++] = srcData[srcIndex++];
078: }
079: } else if (b <= -1 && b >= -127) {
080: // 2-byte encoded run packet
081: byte repeat = srcData[srcIndex++];
082: for (int i = 0; i < (-b + 1); i++) {
083: dstData[dstIndex++] = repeat;
084: }
085: } else {
086: // No-op packet, do nothing
087: ++srcIndex;
088: }
089: }
090: } catch (ArrayIndexOutOfBoundsException e) {
091: if (reader instanceof TIFFImageReader) {
092: ((TIFFImageReader) reader)
093: .forwardWarningMessage("ArrayIndexOutOfBoundsException ignored in TIFFPackBitsDecompressor.decode()");
094: }
095: }
096:
097: return dstIndex - dstOffset;
098: }
099:
100: public void decodeRaw(byte[] b, int dstOffset, int bitsPerPixel,
101: int scanlineStride) throws IOException {
102: stream.seek(offset);
103:
104: byte[] srcData = new byte[byteCount];
105: stream.readFully(srcData);
106:
107: int bytesPerRow = (srcWidth * bitsPerPixel + 7) / 8;
108: byte[] buf;
109: int bufOffset;
110: if (bytesPerRow == scanlineStride) {
111: buf = b;
112: bufOffset = dstOffset;
113: } else {
114: buf = new byte[bytesPerRow * srcHeight];
115: bufOffset = 0;
116: }
117:
118: decode(srcData, 0, buf, bufOffset);
119:
120: if (bytesPerRow != scanlineStride) {
121: if (DEBUG) {
122: System.out.println("bytesPerRow != scanlineStride");
123: }
124: int off = 0;
125: for (int y = 0; y < srcHeight; y++) {
126: System.arraycopy(buf, off, b, dstOffset, bytesPerRow);
127: off += bytesPerRow;
128: dstOffset += scanlineStride;
129: }
130: }
131: }
132: }
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