001: /*
002: * $RCSfile: TIFFPackBitsUtil.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.TIFFTag;
052:
053: public class TIFFPackBitsUtil {
054:
055: private static final boolean debug = false;
056:
057: byte[] dstData = new byte[8192];
058: int dstIndex = 0;
059:
060: public TIFFPackBitsUtil() {
061: }
062:
063: private void ensureCapacity(int bytesToAdd) {
064: if (dstIndex + bytesToAdd > dstData.length) {
065: byte[] newDstData = new byte[Math.max(
066: (int) (dstData.length * 1.2f), dstIndex
067: + bytesToAdd)];
068: System.arraycopy(dstData, 0, newDstData, 0, dstData.length);
069: dstData = newDstData;
070: }
071: }
072:
073: public byte[] decode(byte[] srcData) throws IOException {
074: int inIndex = 0;
075: while (inIndex < srcData.length) {
076: byte b = srcData[inIndex++];
077:
078: if (b >= 0 && b <= 127) { // second test not needed?
079: // Literal run packet
080:
081: ensureCapacity(b + 1);
082: for (int i = 0; i < b + 1; i++) {
083: dstData[dstIndex++] = srcData[inIndex++];
084: }
085: } else if (b <= -1 && b >= -127) {
086: // 2-byte encoded run packet
087: byte repeat = srcData[inIndex++];
088: ensureCapacity(-b + 1);
089: for (int i = 0; i < (-b + 1); i++) {
090: dstData[dstIndex++] = repeat;
091: }
092: } else {
093: // No-op packet, do nothing
094: ++inIndex;
095: }
096: }
097:
098: byte[] newDstData = new byte[dstIndex];
099: System.arraycopy(dstData, 0, newDstData, 0, dstIndex);
100: return newDstData;
101: }
102: }
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