diff options
Diffstat (limited to 'src/main/java/com/lowagie/text/pdf/codec/TiffImage.java')
| -rw-r--r-- | src/main/java/com/lowagie/text/pdf/codec/TiffImage.java | 522 |
1 files changed, 522 insertions, 0 deletions
diff --git a/src/main/java/com/lowagie/text/pdf/codec/TiffImage.java b/src/main/java/com/lowagie/text/pdf/codec/TiffImage.java new file mode 100644 index 0000000..cc812d7 --- /dev/null +++ b/src/main/java/com/lowagie/text/pdf/codec/TiffImage.java @@ -0,0 +1,522 @@ +/*
+ * Copyright 2003-2005 by Paulo Soares.
+ *
+ * The contents of this file are subject to the Mozilla Public License Version 1.1
+ * (the "License"); you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the License.
+ *
+ * The Original Code is 'iText, a free JAVA-PDF library'.
+ *
+ * The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
+ * the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
+ * All Rights Reserved.
+ * Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
+ * are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
+ *
+ * Contributor(s): all the names of the contributors are added in the source code
+ * where applicable.
+ *
+ * Alternatively, the contents of this file may be used under the terms of the
+ * LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
+ * provisions of LGPL are applicable instead of those above. If you wish to
+ * allow use of your version of this file only under the terms of the LGPL
+ * License and not to allow others to use your version of this file under
+ * the MPL, indicate your decision by deleting the provisions above and
+ * replace them with the notice and other provisions required by the LGPL.
+ * If you do not delete the provisions above, a recipient may use your version
+ * of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
+ *
+ * This library is free software; you can redistribute it and/or modify it
+ * under the terms of the MPL as stated above or under the terms of the GNU
+ * Library General Public License as published by the Free Software Foundation;
+ * either version 2 of the License, or any later version.
+ *
+ * This library 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 Library general Public License for more
+ * details.
+ *
+ * If you didn't download this code from the following link, you should check if
+ * you aren't using an obsolete version:
+ * http://www.lowagie.com/iText/
+ */
+package com.lowagie.text.pdf.codec;
+import com.lowagie.text.pdf.*;
+import com.lowagie.text.Image;
+import com.lowagie.text.Jpeg;
+import com.lowagie.text.ExceptionConverter;
+import java.io.*;
+import java.util.zip.*;
+import java.awt.color.ICC_Profile;
+
+/** Reads TIFF images
+ * @author Paulo Soares (psoares@consiste.pt)
+ */
+public class TiffImage {
+
+ /** Gets the number of pages the TIFF document has.
+ * @param s the file source
+ * @return the number of pages
+ */
+ public static int getNumberOfPages(RandomAccessFileOrArray s) {
+ try {
+ return TIFFDirectory.getNumDirectories(s);
+ }
+ catch (Exception e) {
+ throw new ExceptionConverter(e);
+ }
+ }
+
+ static int getDpi(TIFFField fd, int resolutionUnit) {
+ if (fd == null)
+ return 0;
+ long res[] = fd.getAsRational(0);
+ float frac = (float)res[0] / (float)res[1];
+ int dpi = 0;
+ switch (resolutionUnit) {
+ case TIFFConstants.RESUNIT_INCH:
+ case TIFFConstants.RESUNIT_NONE:
+ dpi = (int)frac;
+ break;
+ case TIFFConstants.RESUNIT_CENTIMETER:
+ dpi = (int)(frac * 2.54);
+ break;
+ }
+ return dpi;
+ }
+
+ /** Reads a page from a TIFF image. Direct mode is not used.
+ * @param s the file source
+ * @param page the page to get. The first page is 1
+ * @return the <CODE>Image</CODE>
+ */
+ public static Image getTiffImage(RandomAccessFileOrArray s, int page) {
+ return getTiffImage(s, page, false);
+ }
+
+ /** Reads a page from a TIFF image.
+ * @param s the file source
+ * @param page the page to get. The first page is 1
+ * @param direct for single strip, CCITT images, generate the image
+ * by direct byte copying. It's faster but may not work
+ * every time
+ * @return the <CODE>Image</CODE>
+ */
+ public static Image getTiffImage(RandomAccessFileOrArray s, int page, boolean direct) {
+ if (page < 1)
+ throw new IllegalArgumentException("The page number must be >= 1.");
+ try {
+ TIFFDirectory dir = new TIFFDirectory(s, page - 1);
+ if (dir.isTagPresent(TIFFConstants.TIFFTAG_TILEWIDTH))
+ throw new IllegalArgumentException("Tiles are not supported.");
+ int compression = (int)dir.getFieldAsLong(TIFFConstants.TIFFTAG_COMPRESSION);
+ switch (compression) {
+ case TIFFConstants.COMPRESSION_CCITTRLEW:
+ case TIFFConstants.COMPRESSION_CCITTRLE:
+ case TIFFConstants.COMPRESSION_CCITTFAX3:
+ case TIFFConstants.COMPRESSION_CCITTFAX4:
+ break;
+ default:
+ return getTiffImageColor(dir, s);
+ }
+ float rotation = 0;
+ if (dir.isTagPresent(TIFFConstants.TIFFTAG_ORIENTATION)) {
+ int rot = (int)dir.getFieldAsLong(TIFFConstants.TIFFTAG_ORIENTATION);
+ if (rot == TIFFConstants.ORIENTATION_BOTRIGHT || rot == TIFFConstants.ORIENTATION_BOTLEFT)
+ rotation = (float)Math.PI;
+ else if (rot == TIFFConstants.ORIENTATION_LEFTTOP || rot == TIFFConstants.ORIENTATION_LEFTBOT)
+ rotation = (float)(Math.PI / 2.0);
+ else if (rot == TIFFConstants.ORIENTATION_RIGHTTOP || rot == TIFFConstants.ORIENTATION_RIGHTBOT)
+ rotation = -(float)(Math.PI / 2.0);
+ }
+
+ Image img = null;
+ long tiffT4Options = 0;
+ long tiffT6Options = 0;
+ int fillOrder = 1;
+ int h = (int)dir.getFieldAsLong(TIFFConstants.TIFFTAG_IMAGELENGTH);
+ int w = (int)dir.getFieldAsLong(TIFFConstants.TIFFTAG_IMAGEWIDTH);
+ int dpiX = 0;
+ int dpiY = 0;
+ float XYRatio = 0;
+ int resolutionUnit = TIFFConstants.RESUNIT_INCH;
+ if (dir.isTagPresent(TIFFConstants.TIFFTAG_RESOLUTIONUNIT))
+ resolutionUnit = (int)dir.getFieldAsLong(TIFFConstants.TIFFTAG_RESOLUTIONUNIT);
+ dpiX = getDpi(dir.getField(TIFFConstants.TIFFTAG_XRESOLUTION), resolutionUnit);
+ dpiY = getDpi(dir.getField(TIFFConstants.TIFFTAG_YRESOLUTION), resolutionUnit);
+ if (resolutionUnit == TIFFConstants.RESUNIT_NONE) {
+ if (dpiY != 0)
+ XYRatio = (float)dpiX / (float)dpiY;
+ dpiX = 0;
+ dpiY = 0;
+ }
+ long tstrip = 0xFFFFFFFFL;
+ if (dir.isTagPresent(TIFFConstants.TIFFTAG_ROWSPERSTRIP))
+ tstrip = dir.getFieldAsLong(TIFFConstants.TIFFTAG_ROWSPERSTRIP);
+ int rowsStrip = (int)Math.min(h, tstrip);
+ long offset[] = getArrayLongShort(dir, TIFFConstants.TIFFTAG_STRIPOFFSETS);
+ long size[] = getArrayLongShort(dir, TIFFConstants.TIFFTAG_STRIPBYTECOUNTS);
+ if (size == null && h == rowsStrip) { // some TIFF producers are really lousy, so...
+ size = new long[]{s.length() - (int)offset[0]};
+ }
+ boolean reverse = false;
+ TIFFField fillOrderField = dir.getField(TIFFConstants.TIFFTAG_FILLORDER);
+ if (fillOrderField != null)
+ fillOrder = fillOrderField.getAsInt(0);
+ reverse = (fillOrder == TIFFConstants.FILLORDER_LSB2MSB);
+ int params = 0;
+ if (dir.isTagPresent(TIFFConstants.TIFFTAG_PHOTOMETRIC)) {
+ long photo = dir.getFieldAsLong(TIFFConstants.TIFFTAG_PHOTOMETRIC);
+ if (photo == TIFFConstants.PHOTOMETRIC_MINISBLACK)
+ params |= Image.CCITT_BLACKIS1;
+ }
+ int imagecomp = 0;
+ switch (compression) {
+ case TIFFConstants.COMPRESSION_CCITTRLEW:
+ case TIFFConstants.COMPRESSION_CCITTRLE:
+ imagecomp = Image.CCITTG3_1D;
+ params |= Image.CCITT_ENCODEDBYTEALIGN | Image.CCITT_ENDOFBLOCK;
+ break;
+ case TIFFConstants.COMPRESSION_CCITTFAX3:
+ imagecomp = Image.CCITTG3_1D;
+ params |= Image.CCITT_ENDOFLINE | Image.CCITT_ENDOFBLOCK;
+ TIFFField t4OptionsField = dir.getField(TIFFConstants.TIFFTAG_GROUP3OPTIONS);
+ if (t4OptionsField != null) {
+ tiffT4Options = t4OptionsField.getAsLong(0);
+ if ((tiffT4Options & TIFFConstants.GROUP3OPT_2DENCODING) != 0)
+ imagecomp = Image.CCITTG3_2D;
+ if ((tiffT4Options & TIFFConstants.GROUP3OPT_FILLBITS) != 0)
+ params |= Image.CCITT_ENCODEDBYTEALIGN;
+ }
+ break;
+ case TIFFConstants.COMPRESSION_CCITTFAX4:
+ imagecomp = Image.CCITTG4;
+ TIFFField t6OptionsField = dir.getField(TIFFConstants.TIFFTAG_GROUP4OPTIONS);
+ if (t6OptionsField != null)
+ tiffT6Options = t6OptionsField.getAsLong(0);
+ break;
+ }
+ if (direct && rowsStrip == h) { //single strip, direct
+ byte im[] = new byte[(int)size[0]];
+ s.seek(offset[0]);
+ s.readFully(im);
+ img = Image.getInstance(w, h, reverse, imagecomp, params, im);
+ img.setInverted(true);
+ }
+ else {
+ int rowsLeft = h;
+ CCITTG4Encoder g4 = new CCITTG4Encoder(w);
+ for (int k = 0; k < offset.length; ++k) {
+ byte im[] = new byte[(int)size[k]];
+ s.seek(offset[k]);
+ s.readFully(im);
+ int height = Math.min(rowsStrip, rowsLeft);
+ TIFFFaxDecoder decoder = new TIFFFaxDecoder(fillOrder, w, height);
+ byte outBuf[] = new byte[(w + 7) / 8 * height];
+ switch (compression) {
+ case TIFFConstants.COMPRESSION_CCITTRLEW:
+ case TIFFConstants.COMPRESSION_CCITTRLE:
+ decoder.decode1D(outBuf, im, 0, height);
+ g4.fax4Encode(outBuf,height);
+ break;
+ case TIFFConstants.COMPRESSION_CCITTFAX3:
+ try {
+ decoder.decode2D(outBuf, im, 0, height, tiffT4Options);
+ }
+ catch (Exception e) {
+ // let's flip the fill bits and try again...
+ tiffT4Options ^= TIFFConstants.GROUP3OPT_FILLBITS;
+ try {
+ decoder.decode2D(outBuf, im, 0, height, tiffT4Options);
+ }
+ catch (Exception e2) {
+ throw e;
+ }
+ }
+ g4.fax4Encode(outBuf, height);
+ break;
+ case TIFFConstants.COMPRESSION_CCITTFAX4:
+ decoder.decodeT6(outBuf, im, 0, height, tiffT6Options);
+ g4.fax4Encode(outBuf, height);
+ break;
+ }
+ rowsLeft -= rowsStrip;
+ }
+ byte g4pic[] = g4.close();
+ img = Image.getInstance(w, h, false, Image.CCITTG4, params & Image.CCITT_BLACKIS1, g4pic);
+ }
+ img.setDpi(dpiX, dpiY);
+ img.setXYRatio(XYRatio);
+ if (dir.isTagPresent(TIFFConstants.TIFFTAG_ICCPROFILE)) {
+ try {
+ TIFFField fd = dir.getField(TIFFConstants.TIFFTAG_ICCPROFILE);
+ ICC_Profile icc_prof = ICC_Profile.getInstance(fd.getAsBytes());
+ if (icc_prof.getNumComponents() == 1)
+ img.tagICC(icc_prof);
+ }
+ catch (Exception e) {
+ //empty
+ }
+ }
+ img.setOriginalType(Image.ORIGINAL_TIFF);
+ if (rotation != 0)
+ img.setInitialRotation(rotation);
+ return img;
+ }
+ catch (Exception e) {
+ throw new ExceptionConverter(e);
+ }
+ }
+
+ protected static Image getTiffImageColor(TIFFDirectory dir, RandomAccessFileOrArray s) {
+ try {
+ int compression = (int)dir.getFieldAsLong(TIFFConstants.TIFFTAG_COMPRESSION);
+ int predictor = 1;
+ TIFFLZWDecoder lzwDecoder = null;
+ switch (compression) {
+ case TIFFConstants.COMPRESSION_NONE:
+ case TIFFConstants.COMPRESSION_LZW:
+ case TIFFConstants.COMPRESSION_PACKBITS:
+ case TIFFConstants.COMPRESSION_DEFLATE:
+ case TIFFConstants.COMPRESSION_OJPEG:
+ break;
+ default:
+ throw new IllegalArgumentException("The compression " + compression + " is not supported.");
+ }
+ int photometric = (int)dir.getFieldAsLong(TIFFConstants.TIFFTAG_PHOTOMETRIC);
+ switch (photometric) {
+ case TIFFConstants.PHOTOMETRIC_MINISWHITE:
+ case TIFFConstants.PHOTOMETRIC_MINISBLACK:
+ case TIFFConstants.PHOTOMETRIC_RGB:
+ case TIFFConstants.PHOTOMETRIC_SEPARATED:
+ case TIFFConstants.PHOTOMETRIC_PALETTE:
+ break;
+ default:
+ throw new IllegalArgumentException("The photometric " + photometric + " is not supported.");
+ }
+ float rotation = 0;
+ if (dir.isTagPresent(TIFFConstants.TIFFTAG_ORIENTATION)) {
+ int rot = (int)dir.getFieldAsLong(TIFFConstants.TIFFTAG_ORIENTATION);
+ if (rot == TIFFConstants.ORIENTATION_BOTRIGHT || rot == TIFFConstants.ORIENTATION_BOTLEFT)
+ rotation = (float)Math.PI;
+ else if (rot == TIFFConstants.ORIENTATION_LEFTTOP || rot == TIFFConstants.ORIENTATION_LEFTBOT)
+ rotation = (float)(Math.PI / 2.0);
+ else if (rot == TIFFConstants.ORIENTATION_RIGHTTOP || rot == TIFFConstants.ORIENTATION_RIGHTBOT)
+ rotation = -(float)(Math.PI / 2.0);
+ }
+ if (dir.isTagPresent(TIFFConstants.TIFFTAG_PLANARCONFIG)
+ && dir.getFieldAsLong(TIFFConstants.TIFFTAG_PLANARCONFIG) == TIFFConstants.PLANARCONFIG_SEPARATE)
+ throw new IllegalArgumentException("Planar images are not supported.");
+ if (dir.isTagPresent(TIFFConstants.TIFFTAG_EXTRASAMPLES))
+ throw new IllegalArgumentException("Extra samples are not supported.");
+ int samplePerPixel = 1;
+ if (dir.isTagPresent(TIFFConstants.TIFFTAG_SAMPLESPERPIXEL)) // 1,3,4
+ samplePerPixel = (int)dir.getFieldAsLong(TIFFConstants.TIFFTAG_SAMPLESPERPIXEL);
+ int bitsPerSample = 1;
+ if (dir.isTagPresent(TIFFConstants.TIFFTAG_BITSPERSAMPLE))
+ bitsPerSample = (int)dir.getFieldAsLong(TIFFConstants.TIFFTAG_BITSPERSAMPLE);
+ switch (bitsPerSample) {
+ case 1:
+ case 2:
+ case 4:
+ case 8:
+ break;
+ default:
+ throw new IllegalArgumentException("Bits per sample " + bitsPerSample + " is not supported.");
+ }
+ Image img = null;
+
+ int h = (int)dir.getFieldAsLong(TIFFConstants.TIFFTAG_IMAGELENGTH);
+ int w = (int)dir.getFieldAsLong(TIFFConstants.TIFFTAG_IMAGEWIDTH);
+ int dpiX = 0;
+ int dpiY = 0;
+ int resolutionUnit = TIFFConstants.RESUNIT_INCH;
+ if (dir.isTagPresent(TIFFConstants.TIFFTAG_RESOLUTIONUNIT))
+ resolutionUnit = (int)dir.getFieldAsLong(TIFFConstants.TIFFTAG_RESOLUTIONUNIT);
+ dpiX = getDpi(dir.getField(TIFFConstants.TIFFTAG_XRESOLUTION), resolutionUnit);
+ dpiY = getDpi(dir.getField(TIFFConstants.TIFFTAG_YRESOLUTION), resolutionUnit);
+ int rowsStrip = h;
+ if (dir.isTagPresent(TIFFConstants.TIFFTAG_ROWSPERSTRIP)) //another hack for broken tiffs
+ rowsStrip = (int)dir.getFieldAsLong(TIFFConstants.TIFFTAG_ROWSPERSTRIP);
+ long offset[] = getArrayLongShort(dir, TIFFConstants.TIFFTAG_STRIPOFFSETS);
+ long size[] = getArrayLongShort(dir, TIFFConstants.TIFFTAG_STRIPBYTECOUNTS);
+ if (size == null && h == rowsStrip) { // some TIFF producers are really lousy, so...
+ size = new long[]{s.length() - (int)offset[0]};
+ }
+ if (compression == TIFFConstants.COMPRESSION_LZW) {
+ TIFFField predictorField = dir.getField(TIFFConstants.TIFFTAG_PREDICTOR);
+ if (predictorField != null) {
+ predictor = predictorField.getAsInt(0);
+ if (predictor != 1 && predictor != 2) {
+ throw new RuntimeException("Illegal value for Predictor in TIFF file.");
+ }
+ if (predictor == 2 && bitsPerSample != 8) {
+ throw new RuntimeException(bitsPerSample + "-bit samples are not supported for Horizontal differencing Predictor.");
+ }
+ }
+ lzwDecoder = new TIFFLZWDecoder(w, predictor,
+ samplePerPixel);
+ }
+ int rowsLeft = h;
+ ByteArrayOutputStream stream = null;
+ DeflaterOutputStream zip = null;
+ CCITTG4Encoder g4 = null;
+ if (bitsPerSample == 1 && samplePerPixel == 1) {
+ g4 = new CCITTG4Encoder(w);
+ }
+ else {
+ stream = new ByteArrayOutputStream();
+ if (compression != TIFFConstants.COMPRESSION_OJPEG)
+ zip = new DeflaterOutputStream(stream);
+ }
+ for (int k = 0; k < offset.length; ++k) {
+ byte im[] = new byte[(int)size[k]];
+ s.seek(offset[k]);
+ s.readFully(im);
+ int height = Math.min(rowsStrip, rowsLeft);
+ byte outBuf[] = null;
+ if (compression != TIFFConstants.COMPRESSION_NONE)
+ outBuf = new byte[(w * bitsPerSample * samplePerPixel + 7) / 8 * height];
+ switch (compression) {
+ case TIFFConstants.COMPRESSION_DEFLATE:
+ inflate(im, outBuf);
+ break;
+ case TIFFConstants.COMPRESSION_NONE:
+ outBuf = im;
+ break;
+ case TIFFConstants.COMPRESSION_PACKBITS:
+ decodePackbits(im, outBuf);
+ break;
+ case TIFFConstants.COMPRESSION_LZW:
+ lzwDecoder.decode(im, outBuf, height);
+ break;
+ case TIFFConstants.COMPRESSION_OJPEG:
+ stream.write(im);
+ break;
+ }
+ if (bitsPerSample == 1 && samplePerPixel == 1) {
+ g4.fax4Encode(outBuf, height);
+ }
+ else if (compression != TIFFConstants.COMPRESSION_OJPEG) {
+ zip.write(outBuf);
+ }
+ rowsLeft -= rowsStrip;
+ }
+ if (bitsPerSample == 1 && samplePerPixel == 1) {
+ img = Image.getInstance(w, h, false, Image.CCITTG4,
+ photometric == TIFFConstants.PHOTOMETRIC_MINISBLACK ? Image.CCITT_BLACKIS1 : 0, g4.close());
+ }
+ else {
+ if (compression == TIFFConstants.COMPRESSION_OJPEG) {
+ img = new Jpeg(stream.toByteArray());
+ }
+ else {
+ zip.close();
+ img = Image.getInstance(w, h, samplePerPixel, bitsPerSample, stream.toByteArray());
+ img.setDeflated(true);
+ }
+ }
+ img.setDpi(dpiX, dpiY);
+ if (compression != TIFFConstants.COMPRESSION_OJPEG) {
+ if (dir.isTagPresent(TIFFConstants.TIFFTAG_ICCPROFILE)) {
+ try {
+ TIFFField fd = dir.getField(TIFFConstants.TIFFTAG_ICCPROFILE);
+ ICC_Profile icc_prof = ICC_Profile.getInstance(fd.getAsBytes());
+ if (samplePerPixel == icc_prof.getNumComponents())
+ img.tagICC(icc_prof);
+ }
+ catch (Exception e) {
+ //empty
+ }
+ }
+ if (dir.isTagPresent(TIFFConstants.TIFFTAG_COLORMAP)) {
+ TIFFField fd = dir.getField(TIFFConstants.TIFFTAG_COLORMAP);
+ char rgb[] = fd.getAsChars();
+ byte palette[] = new byte[rgb.length];
+ int gColor = rgb.length / 3;
+ int bColor = gColor * 2;
+ for (int k = 0; k < gColor; ++k) {
+ palette[k * 3] = (byte)(rgb[k] >>> 8);
+ palette[k * 3 + 1] = (byte)(rgb[k + gColor] >>> 8);
+ palette[k * 3 + 2] = (byte)(rgb[k + bColor] >>> 8);
+ }
+ PdfArray indexed = new PdfArray();
+ indexed.add(PdfName.INDEXED);
+ indexed.add(PdfName.DEVICERGB);
+ indexed.add(new PdfNumber(gColor - 1));
+ indexed.add(new PdfString(palette));
+ PdfDictionary additional = new PdfDictionary();
+ additional.put(PdfName.COLORSPACE, indexed);
+ img.setAdditional(additional);
+ }
+ img.setOriginalType(Image.ORIGINAL_TIFF);
+ }
+ if (photometric == TIFFConstants.PHOTOMETRIC_MINISWHITE)
+ img.setInverted(true);
+ if (rotation != 0)
+ img.setInitialRotation(rotation);
+ return img;
+ }
+ catch (Exception e) {
+ throw new ExceptionConverter(e);
+ }
+ }
+
+ static long[] getArrayLongShort(TIFFDirectory dir, int tag) {
+ TIFFField field = dir.getField(tag);
+ if (field == null)
+ return null;
+ long offset[];
+ if (field.getType() == TIFFField.TIFF_LONG)
+ offset = field.getAsLongs();
+ else { // must be short
+ char temp[] = field.getAsChars();
+ offset = new long[temp.length];
+ for (int k = 0; k < temp.length; ++k)
+ offset[k] = temp[k];
+ }
+ return offset;
+ }
+
+ // Uncompress packbits compressed image data.
+ public static void decodePackbits(byte data[], byte[] dst) {
+ int srcCount = 0, dstCount = 0;
+ byte repeat, b;
+
+ while (dstCount < dst.length) {
+ b = data[srcCount++];
+ if (b >= 0 && b <= 127) {
+ // literal run packet
+ for (int i=0; i<(b + 1); i++) {
+ dst[dstCount++] = data[srcCount++];
+ }
+
+ } else if (b <= -1 && b >= -127) {
+ // 2 byte encoded run packet
+ repeat = data[srcCount++];
+ for (int i=0; i<(-b + 1); i++) {
+ dst[dstCount++] = repeat;
+ }
+ } else {
+ // no-op packet. Do nothing
+ srcCount++;
+ }
+ }
+ }
+
+ public static void inflate(byte[] deflated, byte[] inflated) {
+ Inflater inflater = new Inflater();
+ inflater.setInput(deflated);
+ try {
+ inflater.inflate(inflated);
+ }
+ catch(DataFormatException dfe) {
+ throw new ExceptionConverter(dfe);
+ }
+ }
+
+}
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