From 18df35aa301c29bc6a85f8f8eabe0bd9407d8be6 Mon Sep 17 00:00:00 2001
From: Sven Gothel <sgothel@jausoft.com>
Date: Tue, 9 Jul 2013 16:41:45 +0200
Subject: PNGJ: Bump to git sha1 a0b1101ba2d37de39428ed55c8189502e24a3125 of
https://code.google.com/p/pngj Part 2/2 - Started w/
51427b92a2d9cd3fc619854e26536c9c6adad947
Missed rejected patches ..
---
.../classes/jogamp/opengl/util/pngj/PngReader.java | 1940 ++++++++++----------
1 file changed, 1000 insertions(+), 940 deletions(-)
(limited to 'src/jogl/classes/jogamp/opengl/util/pngj/PngReader.java')
diff --git a/src/jogl/classes/jogamp/opengl/util/pngj/PngReader.java b/src/jogl/classes/jogamp/opengl/util/pngj/PngReader.java
index 8cb4295a5..e42dd8733 100644
--- a/src/jogl/classes/jogamp/opengl/util/pngj/PngReader.java
+++ b/src/jogl/classes/jogamp/opengl/util/pngj/PngReader.java
@@ -1,940 +1,1000 @@
-package jogamp.opengl.util.pngj;
-
-import java.io.IOException;
-import java.io.InputStream;
-import java.util.Arrays;
-import java.util.HashSet;
-import java.util.zip.CRC32;
-import java.util.zip.InflaterInputStream;
-
-import jogamp.opengl.util.pngj.ImageInfo;
-import jogamp.opengl.util.pngj.ImageLine.SampleType;
-import jogamp.opengl.util.pngj.chunks.ChunkHelper;
-import jogamp.opengl.util.pngj.chunks.ChunkLoadBehaviour;
-import jogamp.opengl.util.pngj.chunks.ChunkRaw;
-import jogamp.opengl.util.pngj.chunks.ChunksList;
-import jogamp.opengl.util.pngj.chunks.PngChunk;
-import jogamp.opengl.util.pngj.chunks.PngChunkIDAT;
-import jogamp.opengl.util.pngj.chunks.PngChunkIHDR;
-import jogamp.opengl.util.pngj.chunks.PngChunkSkipped;
-import jogamp.opengl.util.pngj.chunks.PngMetadata;
-
-/**
- * Reads a PNG image, line by line.
- * <p>
- * The reading sequence is as follows: <br>
- * 1. At construction time, the header and IHDR chunk are read (basic image info) <br>
- * 2. Afterwards you can set some additional global options. Eg. {@link #setUnpackedMode(boolean)},
- * {@link #setCrcCheckDisabled()}.<br>
- * 3. Optional: If you call getMetadata() or getChunksLisk() before start reading the rows, all the chunks before IDAT
- * are automatically loaded and available <br>
- * 4a. The rows are read onen by one of the <tt>readRowXXX</tt> methods: {@link #readRowInt(int)},
- * {@link PngReader#readRowByte(int)}, etc, in order, from 0 to nrows-1 (you can skip or repeat rows, but not go
- * backwards)<br>
- * 4b. Alternatively, you can read all rows, or a subset, in a single call: {@link #readRowsInt()},
- * {@link #readRowsByte()} ,etc. In general this consumes more memory, but for interlaced images this is equally
- * efficient, and more so if reading a small subset of rows.<br>
- * 5. Read of the last row auyomatically loads the trailing chunks, and ends the reader.<br>
- * 6. end() forcibly finishes/aborts the reading and closes the stream
- */
-public class PngReader {
- /**
- * Basic image info - final and inmutable.
- */
- public final ImageInfo imgInfo;
-
- /**
- * not necesarily a filename, can be a description - merely informative
- */
- protected final String filename;
-
- private ChunkLoadBehaviour chunkLoadBehaviour = ChunkLoadBehaviour.LOAD_CHUNK_ALWAYS; // see setter/getter
-
- private boolean shouldCloseStream = true; // true: closes stream after ending - see setter/getter
-
- // some performance/defensive limits
- private long maxTotalBytesRead = 200 * 1024 * 1024; // 200MB
- private int maxBytesMetadata = 5 * 1024 * 1024; // for ancillary chunks - see setter/getter
- private int skipChunkMaxSize = 2 * 1024 * 1024; // chunks exceeding this size will be skipped (nor even CRC checked)
- private String[] skipChunkIds = { "fdAT" }; // chunks with these ids will be skipped (nor even CRC checked)
- private HashSet<String> skipChunkIdsSet; // lazily created from skipChunksById
-
- protected final PngMetadata metadata; // this a wrapper over chunks
- protected final ChunksList chunksList;
-
- protected ImageLine imgLine;
-
- // line as bytes, counting from 1 (index 0 is reserved for filter type)
- protected byte[] rowb = null;
- protected byte[] rowbprev = null; // rowb previous
- protected byte[] rowbfilter = null; // current line 'filtered': exactly as in uncompressed stream
-
- // only set for interlaced PNG
- private final boolean interlaced;
- private final PngDeinterlacer deinterlacer;
-
- private boolean crcEnabled = true;
-
- // this only influences the 1-2-4 bitdepth format
- private boolean unpackedMode = false;
- /**
- * Current chunk group, (0-6) already read or reading
- * <p>
- * see {@link ChunksList}
- */
- protected int currentChunkGroup = -1;
-
- protected int rowNum = -1; // last read row number, starting from 0
- private long offset = 0; // offset in InputStream = bytes read
- private int bytesChunksLoaded; // bytes loaded from anciallary chunks
-
- protected final InputStream inputStream;
- protected InflaterInputStream idatIstream;
- protected PngIDatChunkInputStream iIdatCstream;
-
- protected CRC32 crctest; // If set to non null, it gets a CRC of the unfiltered bytes, to check for images equality
-
- /**
- * Constructs a PngReader from an InputStream.
- * <p>
- * See also <code>FileHelper.createPngReader(File f)</code> if available.
- *
- * Reads only the signature and first chunk (IDHR)
- *
- * @param filenameOrDescription
- * : Optional, can be a filename or a description. Just for error/debug messages
- *
- */
- public PngReader(InputStream inputStream, String filenameOrDescription) {
- this.filename = filenameOrDescription == null ? "" : filenameOrDescription;
- this.inputStream = inputStream;
- this.chunksList = new ChunksList(null);
- this.metadata = new PngMetadata(chunksList);
- // starts reading: signature
- byte[] pngid = new byte[8];
- PngHelperInternal.readBytes(inputStream, pngid, 0, pngid.length);
- offset += pngid.length;
- if (!Arrays.equals(pngid, PngHelperInternal.getPngIdSignature()))
- throw new PngjInputException("Bad PNG signature");
- // reads first chunk
- currentChunkGroup = ChunksList.CHUNK_GROUP_0_IDHR;
- int clen = PngHelperInternal.readInt4(inputStream);
- offset += 4;
- if (clen != 13)
- throw new PngjInputException("IDHR chunk len != 13 ?? " + clen);
- byte[] chunkid = new byte[4];
- PngHelperInternal.readBytes(inputStream, chunkid, 0, 4);
- if (!Arrays.equals(chunkid, ChunkHelper.b_IHDR))
- throw new PngjInputException("IHDR not found as first chunk??? [" + ChunkHelper.toString(chunkid) + "]");
- offset += 4;
- PngChunkIHDR ihdr = (PngChunkIHDR) readChunk(chunkid, clen, false);
- boolean alpha = (ihdr.getColormodel() & 0x04) != 0;
- boolean palette = (ihdr.getColormodel() & 0x01) != 0;
- boolean grayscale = (ihdr.getColormodel() == 0 || ihdr.getColormodel() == 4);
- // creates ImgInfo and imgLine, and allocates buffers
- imgInfo = new ImageInfo(ihdr.getCols(), ihdr.getRows(), ihdr.getBitspc(), alpha, grayscale, palette);
- // allocation: one extra byte for filter type one pixel
- rowbfilter = new byte[imgInfo.bytesPerRow + 1];
- rowb = new byte[imgInfo.bytesPerRow + 1];
- rowbprev = new byte[rowb.length];
- interlaced = ihdr.getInterlaced() == 1;
- deinterlacer = interlaced ? new PngDeinterlacer(imgInfo) : null;
- // some checks
- if (ihdr.getFilmeth() != 0 || ihdr.getCompmeth() != 0 || (ihdr.getInterlaced() & 0xFFFE) != 0)
- throw new PngjInputException("compression method o filter method or interlaced unrecognized ");
- if (ihdr.getColormodel() < 0 || ihdr.getColormodel() > 6 || ihdr.getColormodel() == 1
- || ihdr.getColormodel() == 5)
- throw new PngjInputException("Invalid colormodel " + ihdr.getColormodel());
- if (ihdr.getBitspc() != 1 && ihdr.getBitspc() != 2 && ihdr.getBitspc() != 4 && ihdr.getBitspc() != 8
- && ihdr.getBitspc() != 16)
- throw new PngjInputException("Invalid bit depth " + ihdr.getBitspc());
- }
-
- private boolean firstChunksNotYetRead() {
- return currentChunkGroup < ChunksList.CHUNK_GROUP_1_AFTERIDHR;
- }
-
- /**
- * Reads last Internally called after having read the last line. It reads extra chunks after IDAT, if present.
- */
- private void readLastAndClose() {
- // offset = iIdatCstream.getOffset();
- if (currentChunkGroup < ChunksList.CHUNK_GROUP_5_AFTERIDAT) {
- try {
- idatIstream.close();
- } catch (Exception e) {
- }
- readLastChunks();
- }
- close();
- }
-
- private void close() {
- if (currentChunkGroup < ChunksList.CHUNK_GROUP_6_END) { // this could only happen if forced close
- try {
- idatIstream.close();
- } catch (Exception e) {
- }
- currentChunkGroup = ChunksList.CHUNK_GROUP_6_END;
- }
- if (shouldCloseStream) {
- try {
- inputStream.close();
- } catch (Exception e) {
- throw new PngjInputException("error closing input stream!", e);
- }
- }
- }
-
- // nbytes: NOT including the filter byte. leaves result in rowb
- private void unfilterRow(int nbytes) {
- int ftn = rowbfilter[0];
- FilterType ft = FilterType.getByVal(ftn);
- if (ft == null)
- throw new PngjInputException("Filter type " + ftn + " invalid");
- switch (ft) {
- case FILTER_NONE:
- unfilterRowNone(nbytes);
- break;
- case FILTER_SUB:
- unfilterRowSub(nbytes);
- break;
- case FILTER_UP:
- unfilterRowUp(nbytes);
- break;
- case FILTER_AVERAGE:
- unfilterRowAverage(nbytes);
- break;
- case FILTER_PAETH:
- unfilterRowPaeth(nbytes);
- break;
- default:
- throw new PngjInputException("Filter type " + ftn + " not implemented");
- }
- if (crctest != null)
- crctest.update(rowb, 1, rowb.length - 1);
- }
-
- private void unfilterRowAverage(final int nbytes) {
- int i, j, x;
- for (j = 1 - imgInfo.bytesPixel, i = 1; i <= nbytes; i++, j++) {
- x = j > 0 ? (rowb[j] & 0xff) : 0;
- rowb[i] = (byte) (rowbfilter[i] + (x + (rowbprev[i] & 0xFF)) / 2);
- }
- }
-
- private void unfilterRowNone(final int nbytes) {
- for (int i = 1; i <= nbytes; i++) {
- rowb[i] = (byte) (rowbfilter[i]);
- }
- }
-
- private void unfilterRowPaeth(final int nbytes) {
- int i, j, x, y;
- for (j = 1 - imgInfo.bytesPixel, i = 1; i <= nbytes; i++, j++) {
- x = j > 0 ? (rowb[j] & 0xFF) : 0;
- y = j > 0 ? (rowbprev[j] & 0xFF) : 0;
- rowb[i] = (byte) (rowbfilter[i] + PngHelperInternal.filterPaethPredictor(x, rowbprev[i] & 0xFF, y));
- }
- }
-
- private void unfilterRowSub(final int nbytes) {
- int i, j;
- for (i = 1; i <= imgInfo.bytesPixel; i++) {
- rowb[i] = (byte) (rowbfilter[i]);
- }
- for (j = 1, i = imgInfo.bytesPixel + 1; i <= nbytes; i++, j++) {
- rowb[i] = (byte) (rowbfilter[i] + rowb[j]);
- }
- }
-
- private void unfilterRowUp(final int nbytes) {
- for (int i = 1; i <= nbytes; i++) {
- rowb[i] = (byte) (rowbfilter[i] + rowbprev[i]);
- }
- }
-
- /**
- * Reads chunks before first IDAT. Normally this is called automatically
- * <p>
- * Position before: after IDHR (crc included) Position after: just after the first IDAT chunk id
- * <P>
- * This can be called several times (tentatively), it does nothing if already run
- * <p>
- * (Note: when should this be called? in the constructor? hardly, because we loose the opportunity to call
- * setChunkLoadBehaviour() and perhaps other settings before reading the first row? but sometimes we want to access
- * some metadata (plte, phys) before. Because of this, this method can be called explicitly but is also called
- * implicititly in some methods (getMetatada(), getChunksList())
- */
- private final void readFirstChunks() {
- if (!firstChunksNotYetRead())
- return;
- int clen = 0;
- boolean found = false;
- byte[] chunkid = new byte[4]; // it's important to reallocate in each iteration
- currentChunkGroup = ChunksList.CHUNK_GROUP_1_AFTERIDHR;
- while (!found) {
- clen = PngHelperInternal.readInt4(inputStream);
- offset += 4;
- if (clen < 0)
- break;
- PngHelperInternal.readBytes(inputStream, chunkid, 0, 4);
- offset += 4;
- if (Arrays.equals(chunkid, ChunkHelper.b_IDAT)) {
- found = true;
- currentChunkGroup = ChunksList.CHUNK_GROUP_4_IDAT;
- // add dummy idat chunk to list
- chunksList.appendReadChunk(new PngChunkIDAT(imgInfo, clen, offset - 8), currentChunkGroup);
- break;
- } else if (Arrays.equals(chunkid, ChunkHelper.b_IEND)) {
- throw new PngjInputException("END chunk found before image data (IDAT) at offset=" + offset);
- }
- if (Arrays.equals(chunkid, ChunkHelper.b_PLTE))
- currentChunkGroup = ChunksList.CHUNK_GROUP_2_PLTE;
- readChunk(chunkid, clen, false);
- if (Arrays.equals(chunkid, ChunkHelper.b_PLTE))
- currentChunkGroup = ChunksList.CHUNK_GROUP_3_AFTERPLTE;
- }
- int idatLen = found ? clen : -1;
- if (idatLen < 0)
- throw new PngjInputException("first idat chunk not found!");
- iIdatCstream = new PngIDatChunkInputStream(inputStream, idatLen, offset);
- idatIstream = new InflaterInputStream(iIdatCstream);
- if (!crcEnabled)
- iIdatCstream.disableCrcCheck();
- }
-
- /**
- * Reads (and processes) chunks after last IDAT.
- **/
- void readLastChunks() {
- // PngHelper.logdebug("idat ended? " + iIdatCstream.isEnded());
- currentChunkGroup = ChunksList.CHUNK_GROUP_5_AFTERIDAT;
- if (!iIdatCstream.isEnded())
- iIdatCstream.forceChunkEnd();
- int clen = iIdatCstream.getLenLastChunk();
- byte[] chunkid = iIdatCstream.getIdLastChunk();
- boolean endfound = false;
- boolean first = true;
- boolean skip = false;
- while (!endfound) {
- skip = false;
- if (!first) {
- clen = PngHelperInternal.readInt4(inputStream);
- offset += 4;
- if (clen < 0)
- throw new PngjInputException("bad chuck len " + clen);
- PngHelperInternal.readBytes(inputStream, chunkid, 0, 4);
- offset += 4;
- }
- first = false;
- if (Arrays.equals(chunkid, ChunkHelper.b_IDAT)) {
- skip = true; // extra dummy (empty?) idat chunk, it can happen, ignore it
- } else if (Arrays.equals(chunkid, ChunkHelper.b_IEND)) {
- currentChunkGroup = ChunksList.CHUNK_GROUP_6_END;
- endfound = true;
- }
- readChunk(chunkid, clen, skip);
- }
- if (!endfound)
- throw new PngjInputException("end chunk not found - offset=" + offset);
- // PngHelper.logdebug("end chunk found ok offset=" + offset);
- }
-
- /**
- * Reads chunkd from input stream, adds to ChunksList, and returns it. If it's skipped, a PngChunkSkipped object is
- * created
- */
- private PngChunk readChunk(byte[] chunkid, int clen, boolean skipforced) {
- if (clen < 0)
- throw new PngjInputException("invalid chunk lenght: " + clen);
- // skipChunksByIdSet is created lazyly, if fist IHDR has already been read
- if (skipChunkIdsSet == null && currentChunkGroup > ChunksList.CHUNK_GROUP_0_IDHR)
- skipChunkIdsSet = new HashSet<String>(Arrays.asList(skipChunkIds));
- String chunkidstr = ChunkHelper.toString(chunkid);
- boolean critical = ChunkHelper.isCritical(chunkidstr);
- PngChunk pngChunk = null;
- boolean skip = skipforced;
- if (maxTotalBytesRead > 0 && clen + offset > maxTotalBytesRead)
- throw new PngjInputException("Maximum total bytes to read exceeeded: " + maxTotalBytesRead + " offset:"
- + offset + " clen=" + clen);
- // an ancillary chunks can be skipped because of several reasons:
- if (currentChunkGroup > ChunksList.CHUNK_GROUP_0_IDHR && !critical)
- skip = skip || (skipChunkMaxSize > 0 && clen >= skipChunkMaxSize) || skipChunkIdsSet.contains(chunkidstr)
- || (maxBytesMetadata > 0 && clen > maxBytesMetadata - bytesChunksLoaded)
- || !ChunkHelper.shouldLoad(chunkidstr, chunkLoadBehaviour);
- if (skip) {
- PngHelperInternal.skipBytes(inputStream, clen);
- PngHelperInternal.readInt4(inputStream); // skip - we dont call PngHelperInternal.skipBytes(inputStream,
- // clen + 4) for risk of overflow
- pngChunk = new PngChunkSkipped(chunkidstr, imgInfo, clen);
- } else {
- ChunkRaw chunk = new ChunkRaw(clen, chunkid, true);
- chunk.readChunkData(inputStream, crcEnabled || critical);
- pngChunk = PngChunk.factory(chunk, imgInfo);
- if (!pngChunk.crit)
- bytesChunksLoaded += chunk.len;
- }
- pngChunk.setOffset(offset - 8L);
- chunksList.appendReadChunk(pngChunk, currentChunkGroup);
- offset += clen + 4L;
- return pngChunk;
- }
-
- /**
- * Logs/prints a warning.
- * <p>
- * The default behaviour is print to stderr, but it can be overriden.
- * <p>
- * This happens rarely - most errors are fatal.
- */
- protected void logWarn(String warn) {
- System.err.println(warn);
- }
-
- /**
- * @see #setChunkLoadBehaviour(ChunkLoadBehaviour)
- */
- public ChunkLoadBehaviour getChunkLoadBehaviour() {
- return chunkLoadBehaviour;
- }
-
- /**
- * Determines which ancillary chunks (metada) are to be loaded
- *
- * @param chunkLoadBehaviour
- * {@link ChunkLoadBehaviour}
- */
- public void setChunkLoadBehaviour(ChunkLoadBehaviour chunkLoadBehaviour) {
- this.chunkLoadBehaviour = chunkLoadBehaviour;
- }
-
- /**
- * All loaded chunks (metada). If we have not yet end reading the image, this will include only the chunks before
- * the pixels data (IDAT)
- * <p>
- * Critical chunks are included, except that all IDAT chunks appearance are replaced by a single dummy-marker IDAT
- * chunk. These might be copied to the PngWriter
- * <p>
- *
- * @see #getMetadata()
- */
- public ChunksList getChunksList() {
- if (firstChunksNotYetRead())
- readFirstChunks();
- return chunksList;
- }
-
- int getCurrentChunkGroup() {
- return currentChunkGroup;
- }
-
- /**
- * High level wrapper over chunksList
- *
- * @see #getChunksList()
- */
- public PngMetadata getMetadata() {
- if (firstChunksNotYetRead())
- readFirstChunks();
- return metadata;
- }
-
- /**
- * If called for first time, calls readRowInt. Elsewhere, it calls the appropiate readRowInt/readRowByte
- * <p>
- * In general, specifying the concrete readRowInt/readRowByte is preferrable
- *
- * @see #readRowInt(int) {@link #readRowByte(int)}
- */
- public ImageLine readRow(int nrow) {
- if (imgLine == null)
- imgLine = new ImageLine(imgInfo, SampleType.INT, unpackedMode);
- return imgLine.sampleType != SampleType.BYTE ? readRowInt(nrow) : readRowByte(nrow);
- }
-
- /**
- * Reads the row as INT, storing it in the {@link #imgLine} property and returning it.
- *
- * The row must be greater or equal than the last read row.
- *
- * @param nrow
- * Row number, from 0 to rows-1. Increasing order.
- * @return ImageLine object, also available as field. Data is in {@link ImageLine#scanline} (int) field.
- */
- public ImageLine readRowInt(int nrow) {
- if (imgLine == null)
- imgLine = new ImageLine(imgInfo, SampleType.INT, unpackedMode);
- if (imgLine.getRown() == nrow) // already read
- return imgLine;
- readRowInt(imgLine.scanline, nrow);
- imgLine.setFilterUsed(FilterType.getByVal(rowbfilter[0]));
- imgLine.setRown(nrow);
- return imgLine;
- }
-
- /**
- * Reads the row as BYTES, storing it in the {@link #imgLine} property and returning it.
- *
- * The row must be greater or equal than the last read row. This method allows to pass the same row that was last
- * read.
- *
- * @param nrow
- * Row number, from 0 to rows-1. Increasing order.
- * @return ImageLine object, also available as field. Data is in {@link ImageLine#scanlineb} (byte) field.
- */
- public ImageLine readRowByte(int nrow) {
- if (imgLine == null)
- imgLine = new ImageLine(imgInfo, SampleType.BYTE, unpackedMode);
- if (imgLine.getRown() == nrow) // already read
- return imgLine;
- readRowByte(imgLine.scanlineb, nrow);
- imgLine.setFilterUsed(FilterType.getByVal(rowbfilter[0]));
- imgLine.setRown(nrow);
- return imgLine;
- }
-
- /**
- * @see #readRowInt(int[], int)
- */
- public final int[] readRow(int[] buffer, final int nrow) {
- return readRowInt(buffer, nrow);
- }
-
- /**
- * Reads a line and returns it as a int[] array.
- * <p>
- * You can pass (optionally) a prealocatted buffer.
- * <p>
- * If the bitdepth is less than 8, the bytes are packed - unless {@link #unpackedMode} is true.
- *
- * @param buffer
- * Prealocated buffer, or null.
- * @param nrow
- * Row number (0 is top). Most be strictly greater than the last read row.
- *
- * @return The scanline in the same passwd buffer if it was allocated, a newly allocated one otherwise
- */
- public final int[] readRowInt(int[] buffer, final int nrow) {
- if (buffer == null)
- buffer = new int[unpackedMode ? imgInfo.samplesPerRow : imgInfo.samplesPerRowPacked];
- if (!interlaced) {
- if (nrow <= rowNum)
- throw new PngjInputException("rows must be read in increasing order: " + nrow);
- int bytesread = 0;
- while (rowNum < nrow)
- bytesread = readRowRaw(rowNum + 1); // read rows, perhaps skipping if necessary
- decodeLastReadRowToInt(buffer, bytesread);
- } else { // interlaced
- if (deinterlacer.getImageInt() == null)
- deinterlacer.setImageInt(readRowsInt().scanlines); // read all image and store it in deinterlacer
- System.arraycopy(deinterlacer.getImageInt()[nrow], 0, buffer, 0, unpackedMode ? imgInfo.samplesPerRow
- : imgInfo.samplesPerRowPacked);
- }
- return buffer;
- }
-
- /**
- * Reads a line and returns it as a byte[] array.
- * <p>
- * You can pass (optionally) a prealocatted buffer.
- * <p>
- * If the bitdepth is less than 8, the bytes are packed - unless {@link #unpackedMode} is true. <br>
- * If the bitdepth is 16, the least significant byte is lost.
- * <p>
- *
- * @param buffer
- * Prealocated buffer, or null.
- * @param nrow
- * Row number (0 is top). Most be strictly greater than the last read row.
- *
- * @return The scanline in the same passwd buffer if it was allocated, a newly allocated one otherwise
- */
- public final byte[] readRowByte(byte[] buffer, final int nrow) {
- if (buffer == null)
- buffer = new byte[unpackedMode ? imgInfo.samplesPerRow : imgInfo.samplesPerRowPacked];
- if (!interlaced) {
- if (nrow <= rowNum)
- throw new PngjInputException("rows must be read in increasing order: " + nrow);
- int bytesread = 0;
- while (rowNum < nrow)
- bytesread = readRowRaw(rowNum + 1); // read rows, perhaps skipping if necessary
- decodeLastReadRowToByte(buffer, bytesread);
- } else { // interlaced
- if (deinterlacer.getImageByte() == null)
- deinterlacer.setImageByte(readRowsByte().scanlinesb); // read all image and store it in deinterlacer
- System.arraycopy(deinterlacer.getImageByte()[nrow], 0, buffer, 0, unpackedMode ? imgInfo.samplesPerRow
- : imgInfo.samplesPerRowPacked);
- }
- return buffer;
- }
-
- /**
- * @param nrow
- * @deprecated Now {@link #readRow(int)} implements the same funcion. This method will be removed in future releases
- */
- public ImageLine getRow(int nrow) {
- return readRow(nrow);
- }
-
- private void decodeLastReadRowToInt(int[] buffer, int bytesRead) {
- if (imgInfo.bitDepth <= 8)
- for (int i = 0, j = 1; i < bytesRead; i++)
- buffer[i] = (rowb[j++] & 0xFF); // http://www.libpng.org/pub/png/spec/1.2/PNG-DataRep.html
- else
- for (int i = 0, j = 1; j <= bytesRead; i++)
- buffer[i] = ((rowb[j++] & 0xFF) << 8) + (rowb[j++] & 0xFF); // 16 bitspc
- if (imgInfo.packed && unpackedMode)
- ImageLine.unpackInplaceInt(imgInfo, buffer, buffer, false);
- }
-
- private void decodeLastReadRowToByte(byte[] buffer, int bytesRead) {
- if (imgInfo.bitDepth <= 8)
- System.arraycopy(rowb, 1, buffer, 0, bytesRead);
- else
- for (int i = 0, j = 1; j < bytesRead; i++, j += 2)
- buffer[i] = rowb[j];// 16 bits in 1 byte: this discards the LSB!!!
- if (imgInfo.packed && unpackedMode)
- ImageLine.unpackInplaceByte(imgInfo, buffer, buffer, false);
- }
-
- /**
- * Reads a set of lines and returns it as a ImageLines object, which wraps matrix. Internally it reads all lines,
- * but decodes and stores only the wanted ones. This starts and ends the reading, and cannot be combined with other
- * reading methods.
- * <p>
- * This it's more efficient (speed an memory) that doing calling readRowInt() for each desired line only if the
- * image is interlaced.
- * <p>
- * Notice that the columns in the matrix is not the pixel width of the image, but rather pixels x channels
- *
- * @see #readRowInt(int) to read about the format of each row
- *
- * @param rowOffset
- * Number of rows to be skipped
- * @param nRows
- * Total number of rows to be read. -1: read all available
- * @param rowStep
- * Row increment. If 1, we read consecutive lines; if 2, we read even/odd lines, etc
- * @return Set of lines as a ImageLines, which wraps a matrix
- */
- public ImageLines readRowsInt(int rowOffset, int nRows, int rowStep) {
- if (nRows < 0)
- nRows = (imgInfo.rows - rowOffset) / rowStep;
- if (rowStep < 1 || rowOffset < 0 || nRows * rowStep + rowOffset > imgInfo.rows)
- throw new PngjInputException("bad args");
- ImageLines imlines = new ImageLines(imgInfo, SampleType.INT, unpackedMode, rowOffset, nRows, rowStep);
- if (!interlaced) {
- for (int j = 0; j < imgInfo.rows; j++) {
- int bytesread = readRowRaw(j); // read and perhaps discards
- int mrow = imlines.imageRowToMatrixRowStrict(j);
- if (mrow >= 0)
- decodeLastReadRowToInt(imlines.scanlines[mrow], bytesread);
- }
- } else { // and now, for something completely different (interlaced)
- int[] buf = new int[unpackedMode ? imgInfo.samplesPerRow : imgInfo.samplesPerRowPacked];
- for (int p = 1; p <= 7; p++) {
- deinterlacer.setPass(p);
- for (int i = 0; i < deinterlacer.getRows(); i++) {
- int bytesread = readRowRaw(i);
- int j = deinterlacer.getCurrRowReal();
- int mrow = imlines.imageRowToMatrixRowStrict(j);
- if (mrow >= 0) {
- decodeLastReadRowToInt(buf, bytesread);
- deinterlacer.deinterlaceInt(buf, imlines.scanlines[mrow], !unpackedMode);
- }
- }
- }
- }
- end();
- return imlines;
- }
-
- /**
- * Same as readRowsInt(0, imgInfo.rows, 1)
- *
- * @see #readRowsInt(int, int, int)
- */
- public ImageLines readRowsInt() {
- return readRowsInt(0, imgInfo.rows, 1);
- }
-
- /**
- * Reads a set of lines and returns it as a ImageLines object, which wrapas a byte[][] matrix. Internally it reads
- * all lines, but decodes and stores only the wanted ones. This starts and ends the reading, and cannot be combined
- * with other reading methods.
- * <p>
- * This it's more efficient (speed an memory) that doing calling readRowByte() for each desired line only if the
- * image is interlaced.
- * <p>
- * Notice that the columns in the matrix is not the pixel width of the image, but rather pixels x channels
- *
- * @see #readRowByte(int) to read about the format of each row. Notice that if the bitdepth is 16 this will lose
- * information
- *
- * @param rowOffset
- * Number of rows to be skipped
- * @param nRows
- * Total number of rows to be read. -1: read all available
- * @param rowStep
- * Row increment. If 1, we read consecutive lines; if 2, we read even/odd lines, etc
- * @return Set of lines as a matrix
- */
- public ImageLines readRowsByte(int rowOffset, int nRows, int rowStep) {
- if (nRows < 0)
- nRows = (imgInfo.rows - rowOffset) / rowStep;
- if (rowStep < 1 || rowOffset < 0 || nRows * rowStep + rowOffset > imgInfo.rows)
- throw new PngjInputException("bad args");
- ImageLines imlines = new ImageLines(imgInfo, SampleType.BYTE, unpackedMode, rowOffset, nRows, rowStep);
- if (!interlaced) {
- for (int j = 0; j < imgInfo.rows; j++) {
- int bytesread = readRowRaw(j); // read and perhaps discards
- int mrow = imlines.imageRowToMatrixRowStrict(j);
- if (mrow >= 0)
- decodeLastReadRowToByte(imlines.scanlinesb[mrow], bytesread);
- }
- } else { // and now, for something completely different (interlaced)
- byte[] buf = new byte[unpackedMode ? imgInfo.samplesPerRow : imgInfo.samplesPerRowPacked];
- for (int p = 1; p <= 7; p++) {
- deinterlacer.setPass(p);
- for (int i = 0; i < deinterlacer.getRows(); i++) {
- int bytesread = readRowRaw(i);
- int j = deinterlacer.getCurrRowReal();
- int mrow = imlines.imageRowToMatrixRowStrict(j);
- if (mrow >= 0) {
- decodeLastReadRowToByte(buf, bytesread);
- deinterlacer.deinterlaceByte(buf, imlines.scanlinesb[mrow], !unpackedMode);
- }
- }
- }
- }
- end();
- return imlines;
- }
-
- /**
- * Same as readRowsByte(0, imgInfo.rows, 1)
- *
- * @see #readRowsByte(int, int, int)
- */
- public ImageLines readRowsByte() {
- return readRowsByte(0, imgInfo.rows, 1);
- }
-
- /*
- * For the interlaced case, nrow indicates the subsampled image - the pass must be set already.
- *
- * This must be called in strict order, both for interlaced or no interlaced.
- *
- * Updates rowNum.
- *
- * Leaves raw result in rowb
- *
- * Returns bytes actually read (not including the filter byte)
- */
- private int readRowRaw(final int nrow) {
- //
- if (nrow == 0 && firstChunksNotYetRead())
- readFirstChunks();
- if (nrow == 0 && interlaced)
- Arrays.fill(rowb, (byte) 0); // new subimage: reset filters: this is enough, see the swap that happens lines
- // below
- int bytesRead = imgInfo.bytesPerRow; // NOT including the filter byte
- if (interlaced) {
- if (nrow < 0 || nrow > deinterlacer.getRows() || (nrow != 0 && nrow != deinterlacer.getCurrRowSubimg() + 1))
- throw new PngjInputException("invalid row in interlaced mode: " + nrow);
- deinterlacer.setRow(nrow);
- bytesRead = (imgInfo.bitspPixel * deinterlacer.getPixelsToRead() + 7) / 8;
- if (bytesRead < 1)
- throw new PngjExceptionInternal("wtf??");
- } else { // check for non interlaced
- if (nrow < 0 || nrow >= imgInfo.rows || nrow != rowNum + 1)
- throw new PngjInputException("invalid row: " + nrow);
- }
- rowNum = nrow;
- // swap buffers
- byte[] tmp = rowb;
- rowb = rowbprev;
- rowbprev = tmp;
- // loads in rowbfilter "raw" bytes, with filter
- PngHelperInternal.readBytes(idatIstream, rowbfilter, 0, bytesRead + 1);
- offset = iIdatCstream.getOffset();
- if (offset < 0)
- throw new PngjExceptionInternal("bad offset ??" + offset);
- if (maxTotalBytesRead > 0 && offset >= maxTotalBytesRead)
- throw new PngjInputException("Reading IDAT: Maximum total bytes to read exceeeded: " + maxTotalBytesRead
- + " offset:" + offset);
- rowb[0] = 0;
- unfilterRow(bytesRead);
- rowb[0] = rowbfilter[0];
- if ((rowNum == imgInfo.rows - 1 && !interlaced) || (interlaced && deinterlacer.isAtLastRow()))
- readLastAndClose();
- return bytesRead;
- }
-
- /**
- * Reads all the (remaining) file, skipping the pixels data. This is much more efficient that calling readRow(),
- * specially for big files (about 10 times faster!), because it doesn't even decompress the IDAT stream and disables
- * CRC check Use this if you are not interested in reading pixels,only metadata.
- */
- public void readSkippingAllRows() {
- if (firstChunksNotYetRead())
- readFirstChunks();
- // we read directly from the compressed stream, we dont decompress nor chec CRC
- iIdatCstream.disableCrcCheck();
- try {
- int r;
- do {
- r = iIdatCstream.read(rowbfilter, 0, rowbfilter.length);
- } while (r >= 0);
- } catch (IOException e) {
- throw new PngjInputException("error in raw read of IDAT", e);
- }
- offset = iIdatCstream.getOffset();
- if (offset < 0)
- throw new PngjExceptionInternal("bad offset ??" + offset);
- if (maxTotalBytesRead > 0 && offset >= maxTotalBytesRead)
- throw new PngjInputException("Reading IDAT: Maximum total bytes to read exceeeded: " + maxTotalBytesRead
- + " offset:" + offset);
- readLastAndClose();
- }
-
- /**
- * Set total maximum bytes to read (0: unlimited; default: 200MB). <br>
- * These are the bytes read (not loaded) in the input stream. If exceeded, an exception will be thrown.
- */
- public void setMaxTotalBytesRead(long maxTotalBytesToRead) {
- this.maxTotalBytesRead = maxTotalBytesToRead;
- }
-
- /**
- * @return Total maximum bytes to read.
- */
- public long getMaxTotalBytesRead() {
- return maxTotalBytesRead;
- }
-
- /**
- * Set total maximum bytes to load from ancillary chunks (0: unlimited; default: 5Mb).<br>
- * If exceeded, some chunks will be skipped
- */
- public void setMaxBytesMetadata(int maxBytesChunksToLoad) {
- this.maxBytesMetadata = maxBytesChunksToLoad;
- }
-
- /**
- * @return Total maximum bytes to load from ancillary ckunks.
- */
- public int getMaxBytesMetadata() {
- return maxBytesMetadata;
- }
-
- /**
- * Set maximum size in bytes for individual ancillary chunks (0: unlimited; default: 2MB). <br>
- * Chunks exceeding this length will be skipped (the CRC will not be checked) and the chunk will be saved as a
- * PngChunkSkipped object. See also setSkipChunkIds
- */
- public void setSkipChunkMaxSize(int skipChunksBySize) {
- this.skipChunkMaxSize = skipChunksBySize;
- }
-
- /**
- * @return maximum size in bytes for individual ancillary chunks.
- */
- public int getSkipChunkMaxSize() {
- return skipChunkMaxSize;
- }
-
- /**
- * Chunks ids to be skipped. <br>
- * These chunks will be skipped (the CRC will not be checked) and the chunk will be saved as a PngChunkSkipped
- * object. See also setSkipChunkMaxSize
- */
- public void setSkipChunkIds(String[] skipChunksById) {
- this.skipChunkIds = skipChunksById == null ? new String[] {} : skipChunksById;
- }
-
- /**
- * @return Chunk-IDs to be skipped.
- */
- public String[] getSkipChunkIds() {
- return skipChunkIds;
- }
-
- /**
- * if true, input stream will be closed after ending read
- * <p>
- * default=true
- */
- public void setShouldCloseStream(boolean shouldCloseStream) {
- this.shouldCloseStream = shouldCloseStream;
- }
-
- /**
- * Normally this does nothing, but it can be used to force a premature closing. Its recommended practice to call it
- * after reading the image pixels.
- */
- public void end() {
- if (currentChunkGroup < ChunksList.CHUNK_GROUP_6_END)
- close();
- }
-
- /**
- * Interlaced PNG is accepted -though not welcomed- now...
- */
- public boolean isInterlaced() {
- return interlaced;
- }
-
- /**
- * set/unset "unpackedMode"<br>
- * If false (default) packed types (bitdepth=1,2 or 4) will keep several samples packed in one element (byte or int) <br>
- * If true, samples will be unpacked on reading, and each element in the scanline will be sample. This implies more
- * processing and memory, but it's the most efficient option if you intend to read individual pixels. <br>
- * This option should only be set before start reading.
- *
- * @param unPackedMode
- */
- public void setUnpackedMode(boolean unPackedMode) {
- this.unpackedMode = unPackedMode;
- }
-
- /**
- * @see PngReader#setUnpackedMode(boolean)
- */
- public boolean isUnpackedMode() {
- return unpackedMode;
- }
-
- /**
- * Disables the CRC integrity check in IDAT chunks and ancillary chunks, this gives a slight increase in reading
- * speed for big files
- */
- public void setCrcCheckDisabled() {
- crcEnabled = false;
- }
-
- /**
- * Just for testing. TO be called after ending reading, only if initCrctest() was called before start
- *
- * @return CRC of the raw pixels values
- */
- long getCrctestVal() {
- return crctest.getValue();
- }
-
- /**
- * Inits CRC object and enables CRC calculation
- */
- void initCrctest() {
- this.crctest = new CRC32();
- }
-
- /**
- * Basic info, for debugging.
- */
- public String toString() { // basic info
- return "filename=" + filename + " " + imgInfo.toString();
- }
-
-}
+package jogamp.opengl.util.pngj;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.Arrays;
+import java.util.HashSet;
+import java.util.zip.CRC32;
+import java.util.zip.Inflater;
+import java.util.zip.InflaterInputStream;
+
+import jogamp.opengl.util.pngj.ImageLine.SampleType;
+import jogamp.opengl.util.pngj.chunks.ChunkHelper;
+import jogamp.opengl.util.pngj.chunks.ChunkLoadBehaviour;
+import jogamp.opengl.util.pngj.chunks.ChunkRaw;
+import jogamp.opengl.util.pngj.chunks.ChunksList;
+import jogamp.opengl.util.pngj.chunks.PngChunk;
+import jogamp.opengl.util.pngj.chunks.PngChunkIDAT;
+import jogamp.opengl.util.pngj.chunks.PngChunkIHDR;
+import jogamp.opengl.util.pngj.chunks.PngChunkSkipped;
+import jogamp.opengl.util.pngj.chunks.PngMetadata;
+
+/**
+ * Reads a PNG image, line by line.
+ * <p>
+ * The reading sequence is as follows: <br>
+ * 1. At construction time, the header and IHDR chunk are read (basic image
+ * info) <br>
+ * 2. Afterwards you can set some additional global options. Eg.
+ * {@link #setUnpackedMode(boolean)}, {@link #setCrcCheckDisabled()}.<br>
+ * 3. Optional: If you call getMetadata() or getChunksLisk() before start
+ * reading the rows, all the chunks before IDAT are automatically loaded and
+ * available <br>
+ * 4a. The rows are read onen by one of the <tt>readRowXXX</tt> methods:
+ * {@link #readRowInt(int)}, {@link PngReader#readRowByte(int)}, etc, in order,
+ * from 0 to nrows-1 (you can skip or repeat rows, but not go backwards)<br>
+ * 4b. Alternatively, you can read all rows, or a subset, in a single call:
+ * {@link #readRowsInt()}, {@link #readRowsByte()} ,etc. In general this
+ * consumes more memory, but for interlaced images this is equally efficient,
+ * and more so if reading a small subset of rows.<br>
+ * 5. Read of the last row auyomatically loads the trailing chunks, and ends the
+ * reader.<br>
+ * 6. end() forcibly finishes/aborts the reading and closes the stream
+ */
+public class PngReader {
+
+ /**
+ * Basic image info - final and inmutable.
+ */
+ public final ImageInfo imgInfo;
+ /**
+ * not necesarily a filename, can be a description - merely informative
+ */
+ protected final String filename;
+ private ChunkLoadBehaviour chunkLoadBehaviour = ChunkLoadBehaviour.LOAD_CHUNK_ALWAYS; // see setter/getter
+ private boolean shouldCloseStream = true; // true: closes stream after ending - see setter/getter
+ // some performance/defensive limits
+ private long maxTotalBytesRead = 200 * 1024 * 1024; // 200MB
+ private int maxBytesMetadata = 5 * 1024 * 1024; // for ancillary chunks - see setter/getter
+ private int skipChunkMaxSize = 2 * 1024 * 1024; // chunks exceeding this size will be skipped (nor even CRC checked)
+ private String[] skipChunkIds = { "fdAT" }; // chunks with these ids will be skipped (nor even CRC checked)
+ private HashSet<String> skipChunkIdsSet; // lazily created from skipChunksById
+ protected final PngMetadata metadata; // this a wrapper over chunks
+ protected final ChunksList chunksList;
+ protected ImageLine imgLine;
+ // line as bytes, counting from 1 (index 0 is reserved for filter type)
+ protected final int buffersLen; // nominal length is imgInfo.bytesPerRow + 1 but it can be larger
+ protected byte[] rowb = null;
+ protected byte[] rowbprev = null; // rowb previous
+ protected byte[] rowbfilter = null; // current line 'filtered': exactly as in uncompressed stream
+ // only set for interlaced PNG
+ private final boolean interlaced;
+ private final PngDeinterlacer deinterlacer;
+ private boolean crcEnabled = true;
+ // this only influences the 1-2-4 bitdepth format
+ private boolean unpackedMode = false;
+ private Inflater inflater = null; // can be reused among several objects. see reuseBuffersFrom()
+ /**
+ * Current chunk group, (0-6) already read or reading
+ * <p>
+ * see {@link ChunksList}
+ */
+ protected int currentChunkGroup = -1;
+ protected int rowNum = -1; // last read row number, starting from 0
+ private long offset = 0; // offset in InputStream = bytes read
+ private int bytesChunksLoaded; // bytes loaded from anciallary chunks
+ protected final InputStream inputStream;
+ protected InflaterInputStream idatIstream;
+ protected PngIDatChunkInputStream iIdatCstream;
+ protected CRC32 crctest; // If set to non null, it gets a CRC of the unfiltered bytes, to check for images equality
+
+ /**
+ * Constructs a PngReader from an InputStream.
+ * <p>
+ * See also <code>FileHelper.createPngReader(File f)</code> if available.
+ *
+ * Reads only the signature and first chunk (IDHR)
+ *
+ * @param filenameOrDescription
+ * : Optional, can be a filename or a description. Just for
+ * error/debug messages
+ *
+ */
+ public PngReader(InputStream inputStream, String filenameOrDescription) {
+ this.filename = filenameOrDescription == null ? "" : filenameOrDescription;
+ this.inputStream = inputStream;
+ this.chunksList = new ChunksList(null);
+ this.metadata = new PngMetadata(chunksList);
+ // starts reading: signature
+ byte[] pngid = new byte[8];
+ PngHelperInternal.readBytes(inputStream, pngid, 0, pngid.length);
+ offset += pngid.length;
+ if (!Arrays.equals(pngid, PngHelperInternal.getPngIdSignature()))
+ throw new PngjInputException("Bad PNG signature");
+ // reads first chunk
+ currentChunkGroup = ChunksList.CHUNK_GROUP_0_IDHR;
+ int clen = PngHelperInternal.readInt4(inputStream);
+ offset += 4;
+ if (clen != 13)
+ throw new PngjInputException("IDHR chunk len != 13 ?? " + clen);
+ byte[] chunkid = new byte[4];
+ PngHelperInternal.readBytes(inputStream, chunkid, 0, 4);
+ if (!Arrays.equals(chunkid, ChunkHelper.b_IHDR))
+ throw new PngjInputException("IHDR not found as first chunk??? [" + ChunkHelper.toString(chunkid) + "]");
+ offset += 4;
+ PngChunkIHDR ihdr = (PngChunkIHDR) readChunk(chunkid, clen, false);
+ boolean alpha = (ihdr.getColormodel() & 0x04) != 0;
+ boolean palette = (ihdr.getColormodel() & 0x01) != 0;
+ boolean grayscale = (ihdr.getColormodel() == 0 || ihdr.getColormodel() == 4);
+ // creates ImgInfo and imgLine, and allocates buffers
+ imgInfo = new ImageInfo(ihdr.getCols(), ihdr.getRows(), ihdr.getBitspc(), alpha, grayscale, palette);
+ interlaced = ihdr.getInterlaced() == 1;
+ deinterlacer = interlaced ? new PngDeinterlacer(imgInfo) : null;
+ buffersLen = imgInfo.bytesPerRow + 1;
+ // some checks
+ if (ihdr.getFilmeth() != 0 || ihdr.getCompmeth() != 0 || (ihdr.getInterlaced() & 0xFFFE) != 0)
+ throw new PngjInputException("compression method o filter method or interlaced unrecognized ");
+ if (ihdr.getColormodel() < 0 || ihdr.getColormodel() > 6 || ihdr.getColormodel() == 1
+ || ihdr.getColormodel() == 5)
+ throw new PngjInputException("Invalid colormodel " + ihdr.getColormodel());
+ if (ihdr.getBitspc() != 1 && ihdr.getBitspc() != 2 && ihdr.getBitspc() != 4 && ihdr.getBitspc() != 8
+ && ihdr.getBitspc() != 16)
+ throw new PngjInputException("Invalid bit depth " + ihdr.getBitspc());
+ }
+
+ private boolean firstChunksNotYetRead() {
+ return currentChunkGroup < ChunksList.CHUNK_GROUP_1_AFTERIDHR;
+ }
+
+ private void allocateBuffers() { // only if needed
+ if (rowbfilter == null || rowbfilter.length < buffersLen) {
+ rowbfilter = new byte[buffersLen];
+ rowb = new byte[buffersLen];
+ rowbprev = new byte[buffersLen];
+ }
+ }
+
+ /**
+ * Reads last Internally called after having read the last line. It reads
+ * extra chunks after IDAT, if present.
+ */
+ private void readLastAndClose() {
+ // offset = iIdatCstream.getOffset();
+ if (currentChunkGroup < ChunksList.CHUNK_GROUP_5_AFTERIDAT) {
+ try {
+ idatIstream.close();
+ } catch (Exception e) {
+ }
+ readLastChunks();
+ }
+ close();
+ }
+
+ private void close() {
+ if (currentChunkGroup < ChunksList.CHUNK_GROUP_6_END) { // this could only happen if forced close
+ try {
+ idatIstream.close();
+ } catch (Exception e) {
+ }
+ currentChunkGroup = ChunksList.CHUNK_GROUP_6_END;
+ }
+ if (shouldCloseStream) {
+ try {
+ inputStream.close();
+ } catch (Exception e) {
+ throw new PngjInputException("error closing input stream!", e);
+ }
+ }
+ }
+
+ // nbytes: NOT including the filter byte. leaves result in rowb
+ private void unfilterRow(int nbytes) {
+ int ftn = rowbfilter[0];
+ FilterType ft = FilterType.getByVal(ftn);
+ if (ft == null)
+ throw new PngjInputException("Filter type " + ftn + " invalid");
+ switch (ft) {
+ case FILTER_NONE:
+ unfilterRowNone(nbytes);
+ break;
+ case FILTER_SUB:
+ unfilterRowSub(nbytes);
+ break;
+ case FILTER_UP:
+ unfilterRowUp(nbytes);
+ break;
+ case FILTER_AVERAGE:
+ unfilterRowAverage(nbytes);
+ break;
+ case FILTER_PAETH:
+ unfilterRowPaeth(nbytes);
+ break;
+ default:
+ throw new PngjInputException("Filter type " + ftn + " not implemented");
+ }
+ if (crctest != null)
+ crctest.update(rowb, 1, buffersLen - 1);
+ }
+
+ private void unfilterRowAverage(final int nbytes) {
+ int i, j, x;
+ for (j = 1 - imgInfo.bytesPixel, i = 1; i <= nbytes; i++, j++) {
+ x = j > 0 ? (rowb[j] & 0xff) : 0;
+ rowb[i] = (byte) (rowbfilter[i] + (x + (rowbprev[i] & 0xFF)) / 2);
+ }
+ }
+
+ private void unfilterRowNone(final int nbytes) {
+ for (int i = 1; i <= nbytes; i++) {
+ rowb[i] = (byte) (rowbfilter[i]);
+ }
+ }
+
+ private void unfilterRowPaeth(final int nbytes) {
+ int i, j, x, y;
+ for (j = 1 - imgInfo.bytesPixel, i = 1; i <= nbytes; i++, j++) {
+ x = j > 0 ? (rowb[j] & 0xFF) : 0;
+ y = j > 0 ? (rowbprev[j] & 0xFF) : 0;
+ rowb[i] = (byte) (rowbfilter[i] + PngHelperInternal.filterPaethPredictor(x, rowbprev[i] & 0xFF, y));
+ }
+ }
+
+ private void unfilterRowSub(final int nbytes) {
+ int i, j;
+ for (i = 1; i <= imgInfo.bytesPixel; i++) {
+ rowb[i] = (byte) (rowbfilter[i]);
+ }
+ for (j = 1, i = imgInfo.bytesPixel + 1; i <= nbytes; i++, j++) {
+ rowb[i] = (byte) (rowbfilter[i] + rowb[j]);
+ }
+ }
+
+ private void unfilterRowUp(final int nbytes) {
+ for (int i = 1; i <= nbytes; i++) {
+ rowb[i] = (byte) (rowbfilter[i] + rowbprev[i]);
+ }
+ }
+
+ /**
+ * Reads chunks before first IDAT. Normally this is called automatically
+ * <p>
+ * Position before: after IDHR (crc included) Position after: just after the
+ * first IDAT chunk id
+ * <P>
+ * This can be called several times (tentatively), it does nothing if
+ * already run
+ * <p>
+ * (Note: when should this be called? in the constructor? hardly, because we
+ * loose the opportunity to call setChunkLoadBehaviour() and perhaps other
+ * settings before reading the first row? but sometimes we want to access
+ * some metadata (plte, phys) before. Because of this, this method can be
+ * called explicitly but is also called implicititly in some methods
+ * (getMetatada(), getChunksList())
+ */
+ private final void readFirstChunks() {
+ if (!firstChunksNotYetRead())
+ return;
+ int clen = 0;
+ boolean found = false;
+ byte[] chunkid = new byte[4]; // it's important to reallocate in each iteration
+ currentChunkGroup = ChunksList.CHUNK_GROUP_1_AFTERIDHR;
+ while (!found) {
+ clen = PngHelperInternal.readInt4(inputStream);
+ offset += 4;
+ if (clen < 0)
+ break;
+ PngHelperInternal.readBytes(inputStream, chunkid, 0, 4);
+ offset += 4;
+ if (Arrays.equals(chunkid, ChunkHelper.b_IDAT)) {
+ found = true;
+ currentChunkGroup = ChunksList.CHUNK_GROUP_4_IDAT;
+ // add dummy idat chunk to list
+ chunksList.appendReadChunk(new PngChunkIDAT(imgInfo, clen, offset - 8), currentChunkGroup);
+ break;
+ } else if (Arrays.equals(chunkid, ChunkHelper.b_IEND)) {
+ throw new PngjInputException("END chunk found before image data (IDAT) at offset=" + offset);
+ }
+ if (Arrays.equals(chunkid, ChunkHelper.b_PLTE))
+ currentChunkGroup = ChunksList.CHUNK_GROUP_2_PLTE;
+ readChunk(chunkid, clen, false);
+ if (Arrays.equals(chunkid, ChunkHelper.b_PLTE))
+ currentChunkGroup = ChunksList.CHUNK_GROUP_3_AFTERPLTE;
+ }
+ int idatLen = found ? clen : -1;
+ if (idatLen < 0)
+ throw new PngjInputException("first idat chunk not found!");
+ iIdatCstream = new PngIDatChunkInputStream(inputStream, idatLen, offset);
+ if(inflater == null) {
+ inflater = new Inflater();
+ } else {
+ inflater.reset();
+ }
+ idatIstream = new InflaterInputStream(iIdatCstream, inflater);
+ if (!crcEnabled)
+ iIdatCstream.disableCrcCheck();
+ }
+
+ /**
+ * Reads (and processes) chunks after last IDAT.
+ **/
+ void readLastChunks() {
+ // PngHelper.logdebug("idat ended? " + iIdatCstream.isEnded());
+ currentChunkGroup = ChunksList.CHUNK_GROUP_5_AFTERIDAT;
+ if (!iIdatCstream.isEnded())
+ iIdatCstream.forceChunkEnd();
+ int clen = iIdatCstream.getLenLastChunk();
+ byte[] chunkid = iIdatCstream.getIdLastChunk();
+ boolean endfound = false;
+ boolean first = true;
+ boolean skip = false;
+ while (!endfound) {
+ skip = false;
+ if (!first) {
+ clen = PngHelperInternal.readInt4(inputStream);
+ offset += 4;
+ if (clen < 0)
+ throw new PngjInputException("bad chuck len " + clen);
+ PngHelperInternal.readBytes(inputStream, chunkid, 0, 4);
+ offset += 4;
+ }
+ first = false;
+ if (Arrays.equals(chunkid, ChunkHelper.b_IDAT)) {
+ skip = true; // extra dummy (empty?) idat chunk, it can happen, ignore it
+ } else if (Arrays.equals(chunkid, ChunkHelper.b_IEND)) {
+ currentChunkGroup = ChunksList.CHUNK_GROUP_6_END;
+ endfound = true;
+ }
+ readChunk(chunkid, clen, skip);
+ }
+ if (!endfound)
+ throw new PngjInputException("end chunk not found - offset=" + offset);
+ // PngHelper.logdebug("end chunk found ok offset=" + offset);
+ }
+
+ /**
+ * Reads chunkd from input stream, adds to ChunksList, and returns it. If
+ * it's skipped, a PngChunkSkipped object is created
+ */
+ private PngChunk readChunk(byte[] chunkid, int clen, boolean skipforced) {
+ if (clen < 0)
+ throw new PngjInputException("invalid chunk lenght: " + clen);
+ // skipChunksByIdSet is created lazyly, if fist IHDR has already been read
+ if (skipChunkIdsSet == null && currentChunkGroup > ChunksList.CHUNK_GROUP_0_IDHR)
+ skipChunkIdsSet = new HashSet<String>(Arrays.asList(skipChunkIds));
+ String chunkidstr = ChunkHelper.toString(chunkid);
+ boolean critical = ChunkHelper.isCritical(chunkidstr);
+ PngChunk pngChunk = null;
+ boolean skip = skipforced;
+ if (maxTotalBytesRead > 0 && clen + offset > maxTotalBytesRead)
+ throw new PngjInputException("Maximum total bytes to read exceeeded: " + maxTotalBytesRead + " offset:"
+ + offset + " clen=" + clen);
+ // an ancillary chunks can be skipped because of several reasons:
+ if (currentChunkGroup > ChunksList.CHUNK_GROUP_0_IDHR && !critical)
+ skip = skip || (skipChunkMaxSize > 0 && clen >= skipChunkMaxSize) || skipChunkIdsSet.contains(chunkidstr)
+ || (maxBytesMetadata > 0 && clen > maxBytesMetadata - bytesChunksLoaded)
+ || !ChunkHelper.shouldLoad(chunkidstr, chunkLoadBehaviour);
+ if (skip) {
+ PngHelperInternal.skipBytes(inputStream, clen);
+ PngHelperInternal.readInt4(inputStream); // skip - we dont call PngHelperInternal.skipBytes(inputStream,
+ // clen + 4) for risk of overflow
+ pngChunk = new PngChunkSkipped(chunkidstr, imgInfo, clen);
+ } else {
+ ChunkRaw chunk = new ChunkRaw(clen, chunkid, true);
+ chunk.readChunkData(inputStream, crcEnabled || critical);
+ pngChunk = PngChunk.factory(chunk, imgInfo);
+ if (!pngChunk.crit)
+ bytesChunksLoaded += chunk.len;
+ }
+ pngChunk.setOffset(offset - 8L);
+ chunksList.appendReadChunk(pngChunk, currentChunkGroup);
+ offset += clen + 4L;
+ return pngChunk;
+ }
+
+ /**
+ * Logs/prints a warning.
+ * <p>
+ * The default behaviour is print to stderr, but it can be overriden.
+ * <p>
+ * This happens rarely - most errors are fatal.
+ */
+ protected void logWarn(String warn) {
+ System.err.println(warn);
+ }
+
+ /**
+ * @see #setChunkLoadBehaviour(ChunkLoadBehaviour)
+ */
+ public ChunkLoadBehaviour getChunkLoadBehaviour() {
+ return chunkLoadBehaviour;
+ }
+
+ /**
+ * Determines which ancillary chunks (metada) are to be loaded
+ *
+ * @param chunkLoadBehaviour
+ * {@link ChunkLoadBehaviour}
+ */
+ public void setChunkLoadBehaviour(ChunkLoadBehaviour chunkLoadBehaviour) {
+ this.chunkLoadBehaviour = chunkLoadBehaviour;
+ }
+
+ /**
+ * All loaded chunks (metada). If we have not yet end reading the image,
+ * this will include only the chunks before the pixels data (IDAT)
+ * <p>
+ * Critical chunks are included, except that all IDAT chunks appearance are
+ * replaced by a single dummy-marker IDAT chunk. These might be copied to
+ * the PngWriter
+ * <p>
+ *
+ * @see #getMetadata()
+ */
+ public ChunksList getChunksList() {
+ if (firstChunksNotYetRead())
+ readFirstChunks();
+ return chunksList;
+ }
+
+ int getCurrentChunkGroup() {
+ return currentChunkGroup;
+ }
+
+ /**
+ * High level wrapper over chunksList
+ *
+ * @see #getChunksList()
+ */
+ public PngMetadata getMetadata() {
+ if (firstChunksNotYetRead())
+ readFirstChunks();
+ return metadata;
+ }
+
+ /**
+ * If called for first time, calls readRowInt. Elsewhere, it calls the
+ * appropiate readRowInt/readRowByte
+ * <p>
+ * In general, specifying the concrete readRowInt/readRowByte is preferrable
+ *
+ * @see #readRowInt(int) {@link #readRowByte(int)}
+ */
+ public ImageLine readRow(int nrow) {
+ if (imgLine == null)
+ imgLine = new ImageLine(imgInfo, SampleType.INT, unpackedMode);
+ return imgLine.sampleType != SampleType.BYTE ? readRowInt(nrow) : readRowByte(nrow);
+ }
+
+ /**
+ * Reads the row as INT, storing it in the {@link #imgLine} property and
+ * returning it.
+ *
+ * The row must be greater or equal than the last read row.
+ *
+ * @param nrow
+ * Row number, from 0 to rows-1. Increasing order.
+ * @return ImageLine object, also available as field. Data is in
+ * {@link ImageLine#scanline} (int) field.
+ */
+ public ImageLine readRowInt(int nrow) {
+ if (imgLine == null)
+ imgLine = new ImageLine(imgInfo, SampleType.INT, unpackedMode);
+ if (imgLine.getRown() == nrow) // already read
+ return imgLine;
+ readRowInt(imgLine.scanline, nrow);
+ imgLine.setFilterUsed(FilterType.getByVal(rowbfilter[0]));
+ imgLine.setRown(nrow);
+ return imgLine;
+ }
+
+ /**
+ * Reads the row as BYTES, storing it in the {@link #imgLine} property and
+ * returning it.
+ *
+ * The row must be greater or equal than the last read row. This method
+ * allows to pass the same row that was last read.
+ *
+ * @param nrow
+ * Row number, from 0 to rows-1. Increasing order.
+ * @return ImageLine object, also available as field. Data is in
+ * {@link ImageLine#scanlineb} (byte) field.
+ */
+ public ImageLine readRowByte(int nrow) {
+ if (imgLine == null)
+ imgLine = new ImageLine(imgInfo, SampleType.BYTE, unpackedMode);
+ if (imgLine.getRown() == nrow) // already read
+ return imgLine;
+ readRowByte(imgLine.scanlineb, nrow);
+ imgLine.setFilterUsed(FilterType.getByVal(rowbfilter[0]));
+ imgLine.setRown(nrow);
+ return imgLine;
+ }
+
+ /**
+ * @see #readRowInt(int[], int)
+ */
+ public final int[] readRow(int[] buffer, final int nrow) {
+ return readRowInt(buffer, nrow);
+ }
+
+ /**
+ * Reads a line and returns it as a int[] array.
+ * <p>
+ * You can pass (optionally) a prealocatted buffer.
+ * <p>
+ * If the bitdepth is less than 8, the bytes are packed - unless
+ * {@link #unpackedMode} is true.
+ *
+ * @param buffer
+ * Prealocated buffer, or null.
+ * @param nrow
+ * Row number (0 is top). Most be strictly greater than the last
+ * read row.
+ *
+ * @return The scanline in the same passwd buffer if it was allocated, a
+ * newly allocated one otherwise
+ */
+ public final int[] readRowInt(int[] buffer, final int nrow) {
+ if (buffer == null)
+ buffer = new int[unpackedMode ? imgInfo.samplesPerRow : imgInfo.samplesPerRowPacked];
+ if (!interlaced) {
+ if (nrow <= rowNum)
+ throw new PngjInputException("rows must be read in increasing order: " + nrow);
+ int bytesread = 0;
+ while (rowNum < nrow)
+ bytesread = readRowRaw(rowNum + 1); // read rows, perhaps skipping if necessary
+ decodeLastReadRowToInt(buffer, bytesread);
+ } else { // interlaced
+ if (deinterlacer.getImageInt() == null)
+ deinterlacer.setImageInt(readRowsInt().scanlines); // read all image and store it in deinterlacer
+ System.arraycopy(deinterlacer.getImageInt()[nrow], 0, buffer, 0, unpackedMode ? imgInfo.samplesPerRow
+ : imgInfo.samplesPerRowPacked);
+ }
+ return buffer;
+ }
+
+ /**
+ * Reads a line and returns it as a byte[] array.
+ * <p>
+ * You can pass (optionally) a prealocatted buffer.
+ * <p>
+ * If the bitdepth is less than 8, the bytes are packed - unless
+ * {@link #unpackedMode} is true. <br>
+ * If the bitdepth is 16, the least significant byte is lost.
+ * <p>
+ *
+ * @param buffer
+ * Prealocated buffer, or null.
+ * @param nrow
+ * Row number (0 is top). Most be strictly greater than the last
+ * read row.
+ *
+ * @return The scanline in the same passwd buffer if it was allocated, a
+ * newly allocated one otherwise
+ */
+ public final byte[] readRowByte(byte[] buffer, final int nrow) {
+ if (buffer == null)
+ buffer = new byte[unpackedMode ? imgInfo.samplesPerRow : imgInfo.samplesPerRowPacked];
+ if (!interlaced) {
+ if (nrow <= rowNum)
+ throw new PngjInputException("rows must be read in increasing order: " + nrow);
+ int bytesread = 0;
+ while (rowNum < nrow)
+ bytesread = readRowRaw(rowNum + 1); // read rows, perhaps skipping if necessary
+ decodeLastReadRowToByte(buffer, bytesread);
+ } else { // interlaced
+ if (deinterlacer.getImageByte() == null)
+ deinterlacer.setImageByte(readRowsByte().scanlinesb); // read all image and store it in deinterlacer
+ System.arraycopy(deinterlacer.getImageByte()[nrow], 0, buffer, 0, unpackedMode ? imgInfo.samplesPerRow
+ : imgInfo.samplesPerRowPacked);
+ }
+ return buffer;
+ }
+
+ /**
+ * @param nrow
+ * @deprecated Now {@link #readRow(int)} implements the same funcion. This
+ * method will be removed in future releases
+ */
+ public ImageLine getRow(int nrow) {
+ return readRow(nrow);
+ }
+
+ private void decodeLastReadRowToInt(int[] buffer, int bytesRead) {
+ if (imgInfo.bitDepth <= 8)
+ for (int i = 0, j = 1; i < bytesRead; i++)
+ buffer[i] = (rowb[j++] & 0xFF); // http://www.libpng.org/pub/png/spec/1.2/PNG-DataRep.html
+ else
+ for (int i = 0, j = 1; j <= bytesRead; i++)
+ buffer[i] = ((rowb[j++] & 0xFF) << 8) + (rowb[j++] & 0xFF); // 16 bitspc
+ if (imgInfo.packed && unpackedMode)
+ ImageLine.unpackInplaceInt(imgInfo, buffer, buffer, false);
+ }
+
+ private void decodeLastReadRowToByte(byte[] buffer, int bytesRead) {
+ if (imgInfo.bitDepth <= 8)
+ System.arraycopy(rowb, 1, buffer, 0, bytesRead);
+ else
+ for (int i = 0, j = 1; j < bytesRead; i++, j += 2)
+ buffer[i] = rowb[j];// 16 bits in 1 byte: this discards the LSB!!!
+ if (imgInfo.packed && unpackedMode)
+ ImageLine.unpackInplaceByte(imgInfo, buffer, buffer, false);
+ }
+
+ /**
+ * Reads a set of lines and returns it as a ImageLines object, which wraps
+ * matrix. Internally it reads all lines, but decodes and stores only the
+ * wanted ones. This starts and ends the reading, and cannot be combined
+ * with other reading methods.
+ * <p>
+ * This it's more efficient (speed an memory) that doing calling
+ * readRowInt() for each desired line only if the image is interlaced.
+ * <p>
+ * Notice that the columns in the matrix is not the pixel width of the
+ * image, but rather pixels x channels
+ *
+ * @see #readRowInt(int) to read about the format of each row
+ *
+ * @param rowOffset
+ * Number of rows to be skipped
+ * @param nRows
+ * Total number of rows to be read. -1: read all available
+ * @param rowStep
+ * Row increment. If 1, we read consecutive lines; if 2, we read
+ * even/odd lines, etc
+ * @return Set of lines as a ImageLines, which wraps a matrix
+ */
+ public ImageLines readRowsInt(int rowOffset, int nRows, int rowStep) {
+ if (nRows < 0)
+ nRows = (imgInfo.rows - rowOffset) / rowStep;
+ if (rowStep < 1 || rowOffset < 0 || nRows * rowStep + rowOffset > imgInfo.rows)
+ throw new PngjInputException("bad args");
+ ImageLines imlines = new ImageLines(imgInfo, SampleType.INT, unpackedMode, rowOffset, nRows, rowStep);
+ if (!interlaced) {
+ for (int j = 0; j < imgInfo.rows; j++) {
+ int bytesread = readRowRaw(j); // read and perhaps discards
+ int mrow = imlines.imageRowToMatrixRowStrict(j);
+ if (mrow >= 0)
+ decodeLastReadRowToInt(imlines.scanlines[mrow], bytesread);
+ }
+ } else { // and now, for something completely different (interlaced)
+ int[] buf = new int[unpackedMode ? imgInfo.samplesPerRow : imgInfo.samplesPerRowPacked];
+ for (int p = 1; p <= 7; p++) {
+ deinterlacer.setPass(p);
+ for (int i = 0; i < deinterlacer.getRows(); i++) {
+ int bytesread = readRowRaw(i);
+ int j = deinterlacer.getCurrRowReal();
+ int mrow = imlines.imageRowToMatrixRowStrict(j);
+ if (mrow >= 0) {
+ decodeLastReadRowToInt(buf, bytesread);
+ deinterlacer.deinterlaceInt(buf, imlines.scanlines[mrow], !unpackedMode);
+ }
+ }
+ }
+ }
+ end();
+ return imlines;
+ }
+
+ /**
+ * Same as readRowsInt(0, imgInfo.rows, 1)
+ *
+ * @see #readRowsInt(int, int, int)
+ */
+ public ImageLines readRowsInt() {
+ return readRowsInt(0, imgInfo.rows, 1);
+ }
+
+ /**
+ * Reads a set of lines and returns it as a ImageLines object, which wrapas
+ * a byte[][] matrix. Internally it reads all lines, but decodes and stores
+ * only the wanted ones. This starts and ends the reading, and cannot be
+ * combined with other reading methods.
+ * <p>
+ * This it's more efficient (speed an memory) that doing calling
+ * readRowByte() for each desired line only if the image is interlaced.
+ * <p>
+ * Notice that the columns in the matrix is not the pixel width of the
+ * image, but rather pixels x channels
+ *
+ * @see #readRowByte(int) to read about the format of each row. Notice that
+ * if the bitdepth is 16 this will lose information
+ *
+ * @param rowOffset
+ * Number of rows to be skipped
+ * @param nRows
+ * Total number of rows to be read. -1: read all available
+ * @param rowStep
+ * Row increment. If 1, we read consecutive lines; if 2, we read
+ * even/odd lines, etc
+ * @return Set of lines as a matrix
+ */
+ public ImageLines readRowsByte(int rowOffset, int nRows, int rowStep) {
+ if (nRows < 0)
+ nRows = (imgInfo.rows - rowOffset) / rowStep;
+ if (rowStep < 1 || rowOffset < 0 || nRows * rowStep + rowOffset > imgInfo.rows)
+ throw new PngjInputException("bad args");
+ ImageLines imlines = new ImageLines(imgInfo, SampleType.BYTE, unpackedMode, rowOffset, nRows, rowStep);
+ if (!interlaced) {
+ for (int j = 0; j < imgInfo.rows; j++) {
+ int bytesread = readRowRaw(j); // read and perhaps discards
+ int mrow = imlines.imageRowToMatrixRowStrict(j);
+ if (mrow >= 0)
+ decodeLastReadRowToByte(imlines.scanlinesb[mrow], bytesread);
+ }
+ } else { // and now, for something completely different (interlaced)
+ byte[] buf = new byte[unpackedMode ? imgInfo.samplesPerRow : imgInfo.samplesPerRowPacked];
+ for (int p = 1; p <= 7; p++) {
+ deinterlacer.setPass(p);
+ for (int i = 0; i < deinterlacer.getRows(); i++) {
+ int bytesread = readRowRaw(i);
+ int j = deinterlacer.getCurrRowReal();
+ int mrow = imlines.imageRowToMatrixRowStrict(j);
+ if (mrow >= 0) {
+ decodeLastReadRowToByte(buf, bytesread);
+ deinterlacer.deinterlaceByte(buf, imlines.scanlinesb[mrow], !unpackedMode);
+ }
+ }
+ }
+ }
+ end();
+ return imlines;
+ }
+
+ /**
+ * Same as readRowsByte(0, imgInfo.rows, 1)
+ *
+ * @see #readRowsByte(int, int, int)
+ */
+ public ImageLines readRowsByte() {
+ return readRowsByte(0, imgInfo.rows, 1);
+ }
+
+ /*
+ * For the interlaced case, nrow indicates the subsampled image - the pass must be set already.
+ *
+ * This must be called in strict order, both for interlaced or no interlaced.
+ *
+ * Updates rowNum.
+ *
+ * Leaves raw result in rowb
+ *
+ * Returns bytes actually read (not including the filter byte)
+ */
+ private int readRowRaw(final int nrow) {
+ if (nrow == 0) {
+ if (firstChunksNotYetRead())
+ readFirstChunks();
+ allocateBuffers();
+ if (interlaced)
+ Arrays.fill(rowb, (byte) 0); // new subimage: reset filters: this is enough, see the swap that happens lines
+ }
+ // below
+ int bytesRead = imgInfo.bytesPerRow; // NOT including the filter byte
+ if (interlaced) {
+ if (nrow < 0 || nrow > deinterlacer.getRows() || (nrow != 0 && nrow != deinterlacer.getCurrRowSubimg() + 1))
+ throw new PngjInputException("invalid row in interlaced mode: " + nrow);
+ deinterlacer.setRow(nrow);
+ bytesRead = (imgInfo.bitspPixel * deinterlacer.getPixelsToRead() + 7) / 8;
+ if (bytesRead < 1)
+ throw new PngjExceptionInternal("wtf??");
+ } else { // check for non interlaced
+ if (nrow < 0 || nrow >= imgInfo.rows || nrow != rowNum + 1)
+ throw new PngjInputException("invalid row: " + nrow);
+ }
+ rowNum = nrow;
+ // swap buffers
+ byte[] tmp = rowb;
+ rowb = rowbprev;
+ rowbprev = tmp;
+ // loads in rowbfilter "raw" bytes, with filter
+ PngHelperInternal.readBytes(idatIstream, rowbfilter, 0, bytesRead + 1);
+ offset = iIdatCstream.getOffset();
+ if (offset < 0)
+ throw new PngjExceptionInternal("bad offset ??" + offset);
+ if (maxTotalBytesRead > 0 && offset >= maxTotalBytesRead)
+ throw new PngjInputException("Reading IDAT: Maximum total bytes to read exceeeded: " + maxTotalBytesRead
+ + " offset:" + offset);
+ rowb[0] = 0;
+ unfilterRow(bytesRead);
+ rowb[0] = rowbfilter[0];
+ if ((rowNum == imgInfo.rows - 1 && !interlaced) || (interlaced && deinterlacer.isAtLastRow()))
+ readLastAndClose();
+ return bytesRead;
+ }
+
+ /**
+ * Reads all the (remaining) file, skipping the pixels data. This is much
+ * more efficient that calling readRow(), specially for big files (about 10
+ * times faster!), because it doesn't even decompress the IDAT stream and
+ * disables CRC check Use this if you are not interested in reading
+ * pixels,only metadata.
+ */
+ public void readSkippingAllRows() {
+ if (firstChunksNotYetRead())
+ readFirstChunks();
+ // we read directly from the compressed stream, we dont decompress nor chec CRC
+ iIdatCstream.disableCrcCheck();
+ allocateBuffers();
+ try {
+ int r;
+ do {
+ r = iIdatCstream.read(rowbfilter, 0, buffersLen);
+ } while (r >= 0);
+ } catch (IOException e) {
+ throw new PngjInputException("error in raw read of IDAT", e);
+ }
+ offset = iIdatCstream.getOffset();
+ if (offset < 0)
+ throw new PngjExceptionInternal("bad offset ??" + offset);
+ if (maxTotalBytesRead > 0 && offset >= maxTotalBytesRead)
+ throw new PngjInputException("Reading IDAT: Maximum total bytes to read exceeeded: " + maxTotalBytesRead
+ + " offset:" + offset);
+ readLastAndClose();
+ }
+
+ /**
+ * Set total maximum bytes to read (0: unlimited; default: 200MB). <br>
+ * These are the bytes read (not loaded) in the input stream. If exceeded,
+ * an exception will be thrown.
+ */
+ public void setMaxTotalBytesRead(long maxTotalBytesToRead) {
+ this.maxTotalBytesRead = maxTotalBytesToRead;
+ }
+
+ /**
+ * @return Total maximum bytes to read.
+ */
+ public long getMaxTotalBytesRead() {
+ return maxTotalBytesRead;
+ }
+
+ /**
+ * Set total maximum bytes to load from ancillary chunks (0: unlimited;
+ * default: 5Mb).<br>
+ * If exceeded, some chunks will be skipped
+ */
+ public void setMaxBytesMetadata(int maxBytesChunksToLoad) {
+ this.maxBytesMetadata = maxBytesChunksToLoad;
+ }
+
+ /**
+ * @return Total maximum bytes to load from ancillary ckunks.
+ */
+ public int getMaxBytesMetadata() {
+ return maxBytesMetadata;
+ }
+
+ /**
+ * Set maximum size in bytes for individual ancillary chunks (0: unlimited;
+ * default: 2MB). <br>
+ * Chunks exceeding this length will be skipped (the CRC will not be
+ * checked) and the chunk will be saved as a PngChunkSkipped object. See
+ * also setSkipChunkIds
+ */
+ public void setSkipChunkMaxSize(int skipChunksBySize) {
+ this.skipChunkMaxSize = skipChunksBySize;
+ }
+
+ /**
+ * @return maximum size in bytes for individual ancillary chunks.
+ */
+ public int getSkipChunkMaxSize() {
+ return skipChunkMaxSize;
+ }
+
+ /**
+ * Chunks ids to be skipped. <br>
+ * These chunks will be skipped (the CRC will not be checked) and the chunk
+ * will be saved as a PngChunkSkipped object. See also setSkipChunkMaxSize
+ */
+ public void setSkipChunkIds(String[] skipChunksById) {
+ this.skipChunkIds = skipChunksById == null ? new String[] {} : skipChunksById;
+ }
+
+ /**
+ * @return Chunk-IDs to be skipped.
+ */
+ public String[] getSkipChunkIds() {
+ return skipChunkIds;
+ }
+
+ /**
+ * if true, input stream will be closed after ending read
+ * <p>
+ * default=true
+ */
+ public void setShouldCloseStream(boolean shouldCloseStream) {
+ this.shouldCloseStream = shouldCloseStream;
+ }
+
+ /**
+ * Normally this does nothing, but it can be used to force a premature
+ * closing. Its recommended practice to call it after reading the image
+ * pixels.
+ */
+ public void end() {
+ if (currentChunkGroup < ChunksList.CHUNK_GROUP_6_END)
+ close();
+ }
+
+ /**
+ * Interlaced PNG is accepted -though not welcomed- now...
+ */
+ public boolean isInterlaced() {
+ return interlaced;
+ }
+
+ /**
+ * set/unset "unpackedMode"<br>
+ * If false (default) packed types (bitdepth=1,2 or 4) will keep several
+ * samples packed in one element (byte or int) <br>
+ * If true, samples will be unpacked on reading, and each element in the
+ * scanline will be sample. This implies more processing and memory, but
+ * it's the most efficient option if you intend to read individual pixels. <br>
+ * This option should only be set before start reading.
+ *
+ * @param unPackedMode
+ */
+ public void setUnpackedMode(boolean unPackedMode) {
+ this.unpackedMode = unPackedMode;
+ }
+
+ /**
+ * @see PngReader#setUnpackedMode(boolean)
+ */
+ public boolean isUnpackedMode() {
+ return unpackedMode;
+ }
+
+ /**
+ * Tries to reuse the allocated buffers from other already used PngReader
+ * object. This will have no effect if the buffers are smaller than necessary.
+ * It also reuses the inflater.
+ *
+ * @param other A PngReader that has already finished reading pixels. Can be null.
+ */
+ public void reuseBuffersFrom(PngReader other) {
+ if(other==null) return;
+ if (other.currentChunkGroup < ChunksList.CHUNK_GROUP_5_AFTERIDAT)
+ throw new PngjInputException("PngReader to be reused have not yet ended reading pixels");
+ if (other.rowbfilter != null && other.rowbfilter.length >= buffersLen) {
+ rowbfilter = other.rowbfilter;
+ rowb = other.rowb;
+ rowbprev = other.rowbprev;
+ }
+ inflater = other.inflater;
+ }
+
+ /**
+ * Disables the CRC integrity check in IDAT chunks and ancillary chunks,
+ * this gives a slight increase in reading speed for big files
+ */
+ public void setCrcCheckDisabled() {
+ crcEnabled = false;
+ }
+
+ /**
+ * Just for testing. TO be called after ending reading, only if
+ * initCrctest() was called before start
+ *
+ * @return CRC of the raw pixels values
+ */
+ long getCrctestVal() {
+ return crctest.getValue();
+ }
+
+ /**
+ * Inits CRC object and enables CRC calculation
+ */
+ void initCrctest() {
+ this.crctest = new CRC32();
+ }
+
+ /**
+ * Basic info, for debugging.
+ */
+ public String toString() { // basic info
+ return "filename=" + filename + " " + imgInfo.toString();
+ }
+}
--
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