/*
    * Licensed to the Apache Software Foundation (ASF) under one or more
    * contributor license agreements.  See the NOTICE file distributed with
    * this work for additional information regarding copyright ownership.
    * The ASF licenses this file to You under the Apache License, Version 2.0
    * (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.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.apache.commons.imaging.formats.psd;
  
  import java.awt.Dimension;
  import java.awt.image.BufferedImage;
  import java.io.ByteArrayInputStream;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.PrintWriter;
  import java.nio.charset.StandardCharsets;
  import java.util.ArrayList;
  import java.util.List;
  
  import org.apache.commons.imaging.AbstractImageParser;
  import org.apache.commons.imaging.ImageFormat;
  import org.apache.commons.imaging.ImageFormats;
  import org.apache.commons.imaging.ImageInfo;
  import org.apache.commons.imaging.ImagingException;
  import org.apache.commons.imaging.bytesource.ByteSource;
  import org.apache.commons.imaging.common.BinaryFunctions;
  import org.apache.commons.imaging.common.ImageMetadata;
  import org.apache.commons.imaging.common.XmpEmbeddable;
  import org.apache.commons.imaging.common.XmpImagingParameters;
  import org.apache.commons.imaging.formats.psd.dataparsers.AbstractDataParser;
  import org.apache.commons.imaging.formats.psd.dataparsers.DataParserBitmap;
  import org.apache.commons.imaging.formats.psd.dataparsers.DataParserCmyk;
  import org.apache.commons.imaging.formats.psd.dataparsers.DataParserGrayscale;
  import org.apache.commons.imaging.formats.psd.dataparsers.DataParserIndexed;
  import org.apache.commons.imaging.formats.psd.dataparsers.DataParserLab;
  import org.apache.commons.imaging.formats.psd.dataparsers.DataParserRgb;
  import org.apache.commons.imaging.formats.psd.datareaders.CompressedDataReader;
  import org.apache.commons.imaging.formats.psd.datareaders.DataReader;
  import org.apache.commons.imaging.formats.psd.datareaders.UncompressedDataReader;
  import org.apache.commons.io.IOUtils;
  import org.apache.commons.lang3.ArrayUtils;
  
  public class PsdImageParser extends AbstractImageParser<PsdImagingParameters> implements XmpEmbeddable {
  
      private static final String DEFAULT_EXTENSION = ImageFormats.PSD.getDefaultExtension();
      private static final String[] ACCEPTED_EXTENSIONS = ImageFormats.PSD.getExtensions();
      private static final int PSD_SECTION_HEADER = 0;
      private static final int PSD_SECTION_COLOR_MODE = 1;
      private static final int PSD_SECTION_IMAGE_RESOURCES = 2;
      private static final int PSD_SECTION_LAYER_AND_MASK_DATA = 3;
      private static final int PSD_SECTION_IMAGE_DATA = 4;
      private static final int PSD_HEADER_LENGTH = 26;
      private static final int COLOR_MODE_INDEXED = 2;
      public static final int IMAGE_RESOURCE_ID_ICC_PROFILE = 0x040F;
      public static final int IMAGE_RESOURCE_ID_XMP = 0x0424;
      public static final String BLOCK_NAME_XMP = "XMP";
  
      /**
       * Constructs a new instance with the big-endian byte order.
       */
      public PsdImageParser() {
          // empty
      }
  
      @Override
      public boolean dumpImageFile(final PrintWriter pw, final ByteSource byteSource) throws ImagingException, IOException {
          pw.println("gif.dumpImageFile");
  
          final ImageInfo fImageData = getImageInfo(byteSource);
          if (fImageData == null) {
              return false;
          }
  
          fImageData.toString(pw, "");
          final PsdImageContents imageContents = readImageContents(byteSource);
  
          imageContents.dump(pw);
          imageContents.header.dump(pw);
  
          final List<ImageResourceBlock> blocks = readImageResourceBlocks(byteSource,
                  // fImageContents.ImageResources,
                  null, -1);
  
          pw.println("blocks.size(): " + blocks.size());
  
          // System.out.println("gif.blocks: " + blocks.blocks.size());
          for (int i = 0; i < blocks.size(); i++) {
              final ImageResourceBlock block = blocks.get(i);
              pw.println("\t" + i + " (" + Integer.toHexString(block.id) + ", " + "'" + new String(block.nameData, StandardCharsets.ISO_8859_1) + "' ("
                      + block.nameData.length + "), "
                     // + block.getClass().getName()
                     // + ", "
                     + " data: " + block.data.length + " type: '" + ImageResourceType.getDescription(block.id) + "' " + ")");
         }
 
         pw.println("");
 
         return true;
     }
 
     @Override
     protected String[] getAcceptedExtensions() {
         return ACCEPTED_EXTENSIONS.clone();
     }
 
     @Override
     protected ImageFormat[] getAcceptedTypes() {
         return new ImageFormat[] { ImageFormats.PSD, //
         };
     }
 
     @Override
     public BufferedImage getBufferedImage(final ByteSource byteSource, final PsdImagingParameters params) throws ImagingException, IOException {
         final PsdImageContents imageContents = readImageContents(byteSource);
         // ImageContents imageContents = readImage(byteSource, false);
 
         final PsdHeaderInfo header = imageContents.header;
         if (header == null) {
             throw new ImagingException("PSD: Couldn't read Header");
         }
 
         // ImageDescriptor id = (ImageDescriptor)
         // findBlock(fImageContents.blocks,
         // kImageSeperator);
         // if (id == null)
         // throw new ImageReadException("PSD: Couldn't read Image Descriptor");
         // GraphicControlExtension gce = (GraphicControlExtension) findBlock(
         // fImageContents.blocks, kGraphicControlExtension);
 
         readImageResourceBlocks(byteSource,
                 // fImageContents.ImageResources,
                 null, -1);
 
         final int width = header.columns;
         final int height = header.rows;
         // int height = header.Columns;
 
         // int transfer_type;
 
         // transfer_type = DataBuffer.TYPE_BYTE;
 
         final boolean hasAlpha = false;
         final BufferedImage result = getBufferedImageFactory(params).getColorBufferedImage(width, height, hasAlpha);
 
         final AbstractDataParser dataParser;
         switch (imageContents.header.mode) {
         case 0: // bitmap
             dataParser = new DataParserBitmap();
             break;
         case 1:
         case 8: // Duotone=8;
             dataParser = new DataParserGrayscale();
             break;
         case 3:
             dataParser = new DataParserRgb();
             break;
         case 4:
             dataParser = new DataParserCmyk();
             break;
         case 9:
             dataParser = new DataParserLab();
             break;
         case COLOR_MODE_INDEXED: {
             // case 2 : // Indexed=2;
             final byte[] ColorModeData = getData(byteSource, PSD_SECTION_COLOR_MODE);
 
             // ImageResourceBlock block = findImageResourceBlock(blocks,
             // 0x03EB);
             // if (block == null)
             // throw new ImageReadException(
             // "Missing: Indexed Color Image Resource Block");
 
             dataParser = new DataParserIndexed(ColorModeData);
             break;
         }
         case 7: // Multichannel=7;
             // fDataParser = new DataParserStub();
             // break;
 
             // case 1 :
             // fDataReader = new CompressedDataReader();
             // break;
         default:
             throw new ImagingException("Unknown Mode: " + imageContents.header.mode);
         }
         final DataReader fDataReader;
         switch (imageContents.compression) {
         case 0:
             fDataReader = new UncompressedDataReader(dataParser);
             break;
         case 1:
             fDataReader = new CompressedDataReader(dataParser);
             break;
         default:
             throw new ImagingException("Unknown Compression: " + imageContents.compression);
         }
 
         try (InputStream is = getInputStream(byteSource, PSD_SECTION_IMAGE_DATA)) {
             fDataReader.readData(is, result, imageContents, this);
 
             // is.
             // ImageContents imageContents = readImageContents(is);
             // return imageContents;
         }
 
         return result;
 
     }
 
     private int getChannelsPerMode(final int mode) {
         switch (mode) {
         case 0: // Bitmap
             return 1;
         case 1: // Grayscale
             return 1;
         case 2: // Indexed
             return -1;
         case 3: // RGB
             return 3;
         case 4: // CMYK
             return 4;
         case 7: // Multichannel
             return -1;
         case 8: // Duotone
             return -1;
         case 9: // Lab
             return 4;
         default:
             return -1;
 
         }
     }
 
     private byte[] getData(final ByteSource byteSource, final int section) throws ImagingException, IOException {
         try (InputStream is = byteSource.getInputStream()) {
             // PsdHeaderInfo header = readHeader(is);
             if (section == PSD_SECTION_HEADER) {
                 return BinaryFunctions.readBytes("Header", is, PSD_HEADER_LENGTH, "Not a Valid PSD File");
             }
             BinaryFunctions.skipBytes(is, PSD_HEADER_LENGTH);
 
             final int colorModeDataLength = BinaryFunctions.read4Bytes("ColorModeDataLength", is, "Not a Valid PSD File", getByteOrder());
 
             if (section == PSD_SECTION_COLOR_MODE) {
                 return BinaryFunctions.readBytes("ColorModeData", is, colorModeDataLength, "Not a Valid PSD File");
             }
 
             BinaryFunctions.skipBytes(is, colorModeDataLength);
             // byte[] ColorModeData = readByteArray("ColorModeData",
             // ColorModeDataLength, is, "Not a Valid PSD File");
 
             final int imageResourcesLength = BinaryFunctions.read4Bytes("ImageResourcesLength", is, "Not a Valid PSD File", getByteOrder());
 
             if (section == PSD_SECTION_IMAGE_RESOURCES) {
                 return BinaryFunctions.readBytes("ImageResources", is, imageResourcesLength, "Not a Valid PSD File");
             }
 
             BinaryFunctions.skipBytes(is, imageResourcesLength);
             // byte[] ImageResources = readByteArray("ImageResources",
             // ImageResourcesLength, is, "Not a Valid PSD File");
 
             final int layerAndMaskDataLength = BinaryFunctions.read4Bytes("LayerAndMaskDataLength", is, "Not a Valid PSD File", getByteOrder());
 
             if (section == PSD_SECTION_LAYER_AND_MASK_DATA) {
                 return BinaryFunctions.readBytes("LayerAndMaskData", is, layerAndMaskDataLength, "Not a Valid PSD File");
             }
 
             BinaryFunctions.skipBytes(is, layerAndMaskDataLength);
             // byte[] LayerAndMaskData = readByteArray("LayerAndMaskData",
             // LayerAndMaskDataLength, is, "Not a Valid PSD File");
 
             BinaryFunctions.read2Bytes("Compression", is, "Not a Valid PSD File", getByteOrder());
 
             // byte[] ImageData = readByteArray("ImageData",
             // LayerAndMaskDataLength, is, "Not a Valid PSD File");
 
             // if (section == kPSD_SECTION_IMAGE_DATA)
             // return readByteArray("LayerAndMaskData", LayerAndMaskDataLength,
             // is,
             // "Not a Valid PSD File");
         }
         throw new ImagingException("getInputStream: Unknown Section: " + section);
     }
 
     @Override
     public String getDefaultExtension() {
         return DEFAULT_EXTENSION;
     }
 
     @Override
     public PsdImagingParameters getDefaultParameters() {
         return new PsdImagingParameters();
     }
 
     @Override
     public byte[] getIccProfileBytes(final ByteSource byteSource, final PsdImagingParameters params) throws ImagingException, IOException {
         final List<ImageResourceBlock> blocks = readImageResourceBlocks(byteSource, new int[] { IMAGE_RESOURCE_ID_ICC_PROFILE, }, 1);
 
         if (blocks.isEmpty()) {
             return null;
         }
 
         final ImageResourceBlock irb = blocks.get(0);
         final byte[] bytes = irb.data;
         if (bytes == null || bytes.length < 1) {
             return null;
         }
         return bytes.clone();
     }
 
     @Override
     public ImageInfo getImageInfo(final ByteSource byteSource, final PsdImagingParameters params) throws ImagingException, IOException {
         final PsdImageContents imageContents = readImageContents(byteSource);
         // ImageContents imageContents = readImage(byteSource, false);
 
         final PsdHeaderInfo header = imageContents.header;
         if (header == null) {
             throw new ImagingException("PSD: Couldn't read Header");
         }
 
         final int width = header.columns;
         final int height = header.rows;
 
         final List<String> comments = new ArrayList<>();
         // TODO: comments...
 
         int bitsPerPixel = header.depth * getChannelsPerMode(header.mode);
         // System.out.println("header.Depth: " + header.Depth);
         // System.out.println("header.Mode: " + header.Mode);
         // System.out.println("getChannelsPerMode(header.Mode): " +
         // getChannelsPerMode(header.Mode));
         if (bitsPerPixel < 0) {
             bitsPerPixel = 0;
         }
         final ImageFormat format = ImageFormats.PSD;
         final String formatName = "Photoshop";
         final String mimeType = "image/x-photoshop";
         // we ought to count images, but don't yet.
         final int numberOfImages = -1;
         // not accurate ... only reflects first
         final boolean progressive = false;
 
         final int physicalWidthDpi = 72;
         final float physicalWidthInch = (float) ((double) width / (double) physicalWidthDpi);
         final int physicalHeightDpi = 72;
         final float physicalHeightInch = (float) ((double) height / (double) physicalHeightDpi);
 
         final String formatDetails = "Psd";
 
         final boolean transparent = false; // TODO: inaccurate.
         final boolean usesPalette = header.mode == COLOR_MODE_INDEXED;
         final ImageInfo.ColorType colorType = ImageInfo.ColorType.UNKNOWN;
 
         final ImageInfo.CompressionAlgorithm compressionAlgorithm;
         switch (imageContents.compression) {
         case 0:
             compressionAlgorithm = ImageInfo.CompressionAlgorithm.NONE;
             break;
         case 1:
             compressionAlgorithm = ImageInfo.CompressionAlgorithm.PSD;
             break;
         default:
             compressionAlgorithm = ImageInfo.CompressionAlgorithm.UNKNOWN;
         }
 
         return new ImageInfo(formatDetails, bitsPerPixel, comments, format, formatName, height, mimeType, numberOfImages, physicalHeightDpi, physicalHeightInch,
                 physicalWidthDpi, physicalWidthInch, width, progressive, transparent, usesPalette, colorType, compressionAlgorithm);
     }
 
     @Override
     public Dimension getImageSize(final ByteSource byteSource, final PsdImagingParameters params) throws ImagingException, IOException {
         final PsdHeaderInfo bhi = readHeader(byteSource);
 
         return new Dimension(bhi.columns, bhi.rows);
 
     }
 
     private InputStream getInputStream(final ByteSource byteSource, final int section) throws ImagingException, IOException {
         InputStream is = null;
         boolean notFound = false;
         try {
             is = byteSource.getInputStream();
 
             if (section == PSD_SECTION_HEADER) {
                 return is;
             }
 
             BinaryFunctions.skipBytes(is, PSD_HEADER_LENGTH);
             // is.skip(kHeaderLength);
 
             final int colorModeDataLength = BinaryFunctions.read4Bytes("ColorModeDataLength", is, "Not a Valid PSD File", getByteOrder());
 
             if (section == PSD_SECTION_COLOR_MODE) {
                 return is;
             }
 
             BinaryFunctions.skipBytes(is, colorModeDataLength);
             // byte[] ColorModeData = readByteArray("ColorModeData",
             // ColorModeDataLength, is, "Not a Valid PSD File");
 
             final int imageResourcesLength = BinaryFunctions.read4Bytes("ImageResourcesLength", is, "Not a Valid PSD File", getByteOrder());
 
             if (section == PSD_SECTION_IMAGE_RESOURCES) {
                 return is;
             }
 
             BinaryFunctions.skipBytes(is, imageResourcesLength);
             // byte[] ImageResources = readByteArray("ImageResources",
             // ImageResourcesLength, is, "Not a Valid PSD File");
 
             final int layerAndMaskDataLength = BinaryFunctions.read4Bytes("LayerAndMaskDataLength", is, "Not a Valid PSD File", getByteOrder());
 
             if (section == PSD_SECTION_LAYER_AND_MASK_DATA) {
                 return is;
             }
 
             BinaryFunctions.skipBytes(is, layerAndMaskDataLength);
             // byte[] LayerAndMaskData = readByteArray("LayerAndMaskData",
             // LayerAndMaskDataLength, is, "Not a Valid PSD File");
 
             BinaryFunctions.read2Bytes("Compression", is, "Not a Valid PSD File", getByteOrder());
 
             // byte[] ImageData = readByteArray("ImageData",
             // LayerAndMaskDataLength, is, "Not a Valid PSD File");
 
             if (section == PSD_SECTION_IMAGE_DATA) {
                 return is;
             }
             notFound = true;
         } finally {
             if (notFound) {
                 IOUtils.close(is);
             }
         }
         throw new ImagingException("getInputStream: Unknown Section: " + section);
     }
 
     @Override
     public ImageMetadata getMetadata(final ByteSource byteSource, final PsdImagingParameters params) throws ImagingException, IOException {
         return null;
     }
 
     @Override
     public String getName() {
         return "PSD-Custom";
     }
 
     /**
      * Extracts embedded XML metadata as XML string.
      *
      * @param byteSource File containing image data.
      * @param params     Map of optional parameters, defined in ImagingConstants.
      * @return Xmp Xml as String, if present. Otherwise, returns null.
      */
     @Override
     public String getXmpXml(final ByteSource byteSource, final XmpImagingParameters params) throws ImagingException, IOException {
 
         final PsdImageContents imageContents = readImageContents(byteSource);
 
         final PsdHeaderInfo header = imageContents.header;
         if (header == null) {
             throw new ImagingException("PSD: Couldn't read Header");
         }
 
         final List<ImageResourceBlock> blocks = readImageResourceBlocks(byteSource, new int[] { IMAGE_RESOURCE_ID_XMP, }, -1);
 
         if (blocks.isEmpty()) {
             return null;
         }
 
         final List<ImageResourceBlock> xmpBlocks = new ArrayList<>(blocks);
         if (xmpBlocks.isEmpty()) {
             return null;
         }
         if (xmpBlocks.size() > 1) {
             throw new ImagingException("PSD contains more than one XMP block.");
         }
 
         final ImageResourceBlock block = xmpBlocks.get(0);
 
         // segment data is UTF-8 encoded xml.
         return new String(block.data, 0, block.data.length, StandardCharsets.UTF_8);
     }
 
     private boolean keepImageResourceBlock(final int id, final int[] imageResourceIDs) {
         return ArrayUtils.contains(imageResourceIDs, id);
     }
 
     private PsdHeaderInfo readHeader(final ByteSource byteSource) throws ImagingException, IOException {
         try (InputStream is = byteSource.getInputStream()) {
             return readHeader(is);
         }
     }
 
     private PsdHeaderInfo readHeader(final InputStream is) throws ImagingException, IOException {
         BinaryFunctions.readAndVerifyBytes(is, new byte[] { 56, 66, 80, 83 }, "Not a Valid PSD File");
 
         final int version = BinaryFunctions.read2Bytes("Version", is, "Not a Valid PSD File", getByteOrder());
         final byte[] reserved = BinaryFunctions.readBytes("Reserved", is, 6, "Not a Valid PSD File");
         final int channels = BinaryFunctions.read2Bytes("Channels", is, "Not a Valid PSD File", getByteOrder());
         final int rows = BinaryFunctions.read4Bytes("Rows", is, "Not a Valid PSD File", getByteOrder());
         final int columns = BinaryFunctions.read4Bytes("Columns", is, "Not a Valid PSD File", getByteOrder());
         final int depth = BinaryFunctions.read2Bytes("Depth", is, "Not a Valid PSD File", getByteOrder());
         final int mode = BinaryFunctions.read2Bytes("Mode", is, "Not a Valid PSD File", getByteOrder());
 
         return new PsdHeaderInfo(version, reserved, channels, rows, columns, depth, mode);
     }
 
     private PsdImageContents readImageContents(final ByteSource byteSource) throws ImagingException, IOException {
         try (InputStream is = byteSource.getInputStream()) {
             return readImageContents(is);
         }
     }
 
     private PsdImageContents readImageContents(final InputStream is) throws ImagingException, IOException {
         final PsdHeaderInfo header = readHeader(is);
 
         final int colorModeDataLength = BinaryFunctions.read4Bytes("ColorModeDataLength", is, "Not a Valid PSD File", getByteOrder());
         BinaryFunctions.skipBytes(is, colorModeDataLength);
         // is.skip(ColorModeDataLength);
         // byte[] ColorModeData = readByteArray("ColorModeData",
         // ColorModeDataLength, is, "Not a Valid PSD File");
 
         final int imageResourcesLength = BinaryFunctions.read4Bytes("ImageResourcesLength", is, "Not a Valid PSD File", getByteOrder());
         BinaryFunctions.skipBytes(is, imageResourcesLength);
         // long skipped = is.skip(ImageResourcesLength);
         // byte[] ImageResources = readByteArray("ImageResources",
         // ImageResourcesLength, is, "Not a Valid PSD File");
 
         final int layerAndMaskDataLength = BinaryFunctions.read4Bytes("LayerAndMaskDataLength", is, "Not a Valid PSD File", getByteOrder());
         BinaryFunctions.skipBytes(is, layerAndMaskDataLength);
         // is.skip(LayerAndMaskDataLength);
         // byte[] LayerAndMaskData = readByteArray("LayerAndMaskData",
         // LayerAndMaskDataLength, is, "Not a Valid PSD File");
 
         final int compression = BinaryFunctions.read2Bytes("Compression", is, "Not a Valid PSD File", getByteOrder());
 
         // skip_bytes(is, LayerAndMaskDataLength);
         // byte[] ImageData = readByteArray("ImageData", LayerAndMaskDataLength,
         // is, "Not a Valid PSD File");
 
         // System.out.println("Compression: " + Compression);
 
         return new PsdImageContents(header, colorModeDataLength,
                 // ColorModeData,
                 imageResourcesLength,
                 // ImageResources,
                 layerAndMaskDataLength,
                 // LayerAndMaskData,
                 compression);
     }
 
     private List<ImageResourceBlock> readImageResourceBlocks(final byte[] bytes, final int[] imageResourceIDs, final int maxBlocksToRead)
             throws ImagingException, IOException {
         return readImageResourceBlocks(new ByteArrayInputStream(bytes), imageResourceIDs, maxBlocksToRead, bytes.length);
     }
 
     private List<ImageResourceBlock> readImageResourceBlocks(final ByteSource byteSource, final int[] imageResourceIDs, final int maxBlocksToRead)
             throws ImagingException, IOException {
         try (InputStream imageStream = byteSource.getInputStream();
                 InputStream resourceStream = getInputStream(byteSource, PSD_SECTION_IMAGE_RESOURCES)) {
             final PsdImageContents imageContents = readImageContents(imageStream);
             final byte[] ImageResources = BinaryFunctions.readBytes("ImageResources", resourceStream, imageContents.imageResourcesLength,
                     "Not a Valid PSD File");
             return readImageResourceBlocks(ImageResources, imageResourceIDs, maxBlocksToRead);
         }
     }
 
     private List<ImageResourceBlock> readImageResourceBlocks(final InputStream is, final int[] imageResourceIDs, final int maxBlocksToRead, int available)
             throws ImagingException, IOException {
         final List<ImageResourceBlock> result = new ArrayList<>();
 
         while (available > 0) {
             BinaryFunctions.readAndVerifyBytes(is, new byte[] { 56, 66, 73, 77 }, "Not a Valid PSD File");
             available -= 4;
 
             final int id = BinaryFunctions.read2Bytes("ID", is, "Not a Valid PSD File", getByteOrder());
             available -= 2;
 
             final int nameLength = BinaryFunctions.readByte("NameLength", is, "Not a Valid PSD File");
 
             available -= 1;
             final byte[] nameBytes = BinaryFunctions.readBytes("NameData", is, nameLength, "Not a Valid PSD File");
             available -= nameLength;
             if ((nameLength + 1) % 2 != 0) {
                 // final int NameDiscard =
                 BinaryFunctions.readByte("NameDiscard", is, "Not a Valid PSD File");
                 available -= 1;
             }
             // String Name = readPString("Name", 6, is, "Not a Valid PSD File");
             final int dataSize = BinaryFunctions.read4Bytes("Size", is, "Not a Valid PSD File", getByteOrder());
             available -= 4;
             // int ActualDataSize = ((DataSize % 2) == 0)
             // ? DataSize
             // : DataSize + 1; // pad to make even
 
             final byte[] data = BinaryFunctions.readBytes("Data", is, dataSize, "Not a Valid PSD File");
             available -= dataSize;
 
             if (dataSize % 2 != 0) {
                 // final int DataDiscard =
                 BinaryFunctions.readByte("DataDiscard", is, "Not a Valid PSD File");
                 available -= 1;
             }
 
             if (keepImageResourceBlock(id, imageResourceIDs)) {
                 result.add(new ImageResourceBlock(id, nameBytes, data));
 
                 if (maxBlocksToRead >= 0 && result.size() >= maxBlocksToRead) {
                     return result;
                 }
             }
             // debugNumber("ID", ID, 2);
 
         }
 
         return result;
     }
 
 }