/*
    * 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.tiff;
  
  import java.awt.image.BufferedImage;
  import java.io.IOException;
  import java.nio.ByteOrder;
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.Iterator;
  import java.util.List;
  
  import org.apache.commons.imaging.ImagingException;
  import org.apache.commons.imaging.common.Allocator;
  import org.apache.commons.imaging.common.ByteConversions;
  import org.apache.commons.imaging.common.RationalNumber;
  import org.apache.commons.imaging.formats.tiff.constants.TiffConstants;
  import org.apache.commons.imaging.formats.tiff.constants.TiffDirectoryConstants;
  import org.apache.commons.imaging.formats.tiff.constants.TiffTagConstants;
  import org.apache.commons.imaging.formats.tiff.fieldtypes.AbstractFieldType;
  import org.apache.commons.imaging.formats.tiff.taginfos.TagInfo;
  import org.apache.commons.imaging.formats.tiff.taginfos.TagInfoAscii;
  import org.apache.commons.imaging.formats.tiff.taginfos.TagInfoByte;
  import org.apache.commons.imaging.formats.tiff.taginfos.TagInfoBytes;
  import org.apache.commons.imaging.formats.tiff.taginfos.TagInfoDouble;
  import org.apache.commons.imaging.formats.tiff.taginfos.TagInfoDoubles;
  import org.apache.commons.imaging.formats.tiff.taginfos.TagInfoFloat;
  import org.apache.commons.imaging.formats.tiff.taginfos.TagInfoFloats;
  import org.apache.commons.imaging.formats.tiff.taginfos.TagInfoGpsText;
  import org.apache.commons.imaging.formats.tiff.taginfos.TagInfoLong;
  import org.apache.commons.imaging.formats.tiff.taginfos.TagInfoLongs;
  import org.apache.commons.imaging.formats.tiff.taginfos.TagInfoRational;
  import org.apache.commons.imaging.formats.tiff.taginfos.TagInfoRationals;
  import org.apache.commons.imaging.formats.tiff.taginfos.TagInfoSByte;
  import org.apache.commons.imaging.formats.tiff.taginfos.TagInfoSBytes;
  import org.apache.commons.imaging.formats.tiff.taginfos.TagInfoSLong;
  import org.apache.commons.imaging.formats.tiff.taginfos.TagInfoSLongs;
  import org.apache.commons.imaging.formats.tiff.taginfos.TagInfoSRational;
  import org.apache.commons.imaging.formats.tiff.taginfos.TagInfoSRationals;
  import org.apache.commons.imaging.formats.tiff.taginfos.TagInfoSShort;
  import org.apache.commons.imaging.formats.tiff.taginfos.TagInfoSShorts;
  import org.apache.commons.imaging.formats.tiff.taginfos.TagInfoShort;
  import org.apache.commons.imaging.formats.tiff.taginfos.TagInfoShortOrLong;
  import org.apache.commons.imaging.formats.tiff.taginfos.TagInfoShorts;
  import org.apache.commons.imaging.formats.tiff.taginfos.TagInfoXpString;
  
  /**
   * Provides methods and elements for accessing an Image File Directory (IFD) from a TIFF file. In the TIFF specification, the IFD is the main container for
   * individual images or sets of metadata. While not all Directories contain images, images are always stored in a Directory.
   */
  public class TiffDirectory extends AbstractTiffElement implements Iterable<TiffField> {
  
      public static final class ImageDataElement extends AbstractTiffElement {
          public ImageDataElement(final long offset, final int length) {
              super(offset, length);
          }
  
          @Override
          public String getElementDescription() {
              return "ImageDataElement";
          }
      }
  
      public static String description(final int type) {
          switch (type) {
          case TiffDirectoryConstants.DIRECTORY_TYPE_UNKNOWN:
              return "Unknown";
          case TiffDirectoryConstants.DIRECTORY_TYPE_ROOT:
              return "Root";
          case TiffDirectoryConstants.DIRECTORY_TYPE_SUB:
              return "Sub";
          case TiffDirectoryConstants.DIRECTORY_TYPE_THUMBNAIL:
              return "Thumbnail";
          case TiffDirectoryConstants.DIRECTORY_TYPE_EXIF:
              return "Exif";
          case TiffDirectoryConstants.DIRECTORY_TYPE_GPS:
              return "Gps";
          case TiffDirectoryConstants.DIRECTORY_TYPE_INTEROPERABILITY:
              return "Interoperability";
          default:
              return "Bad Type";
          }
      }
  
      private final List<TiffField> entries;
 
     /**
      * Preserves the byte order derived from the TIFF file header. Some of the legacy methods in this class require byte order as an argument, though that use
      * could be phased out eventually.
      */
     private final ByteOrder headerByteOrder;
 
     private JpegImageData jpegImageData;
 
     private final long nextDirectoryOffset;
 
     private AbstractTiffImageData abstractTiffImageData;
 
     public final int type;
 
     public TiffDirectory(final int type, final List<TiffField> entries, final long offset, final long nextDirectoryOffset, final ByteOrder byteOrder) {
         super(offset,
                 TiffConstants.TIFF_DIRECTORY_HEADER_LENGTH + entries.size() * TiffConstants.TIFF_ENTRY_LENGTH + TiffConstants.TIFF_DIRECTORY_FOOTER_LENGTH);
 
         this.type = type;
         this.entries = Collections.unmodifiableList(entries);
         this.nextDirectoryOffset = nextDirectoryOffset;
         this.headerByteOrder = byteOrder;
     }
 
     public String description() {
         return TiffDirectory.description(type);
     }
 
     public void dump() {
         for (final TiffField entry : entries) {
             entry.dump();
         }
     }
 
     public TiffField findField(final TagInfo tag) throws ImagingException {
         final boolean failIfMissing = false;
         return findField(tag, failIfMissing);
     }
 
     public TiffField findField(final TagInfo tag, final boolean failIfMissing) throws ImagingException {
         for (final TiffField field : entries) {
             if (field.getTag() == tag.tag) {
                 return field;
             }
         }
 
         if (failIfMissing) {
             throw new ImagingException("Missing expected field: " + tag.getDescription());
         }
 
         return null;
     }
 
     /**
      * Gets the byte order used by the source file for storing this directory and its content.
      *
      * @return A valid byte order instance.
      */
     public ByteOrder getByteOrder() {
         return headerByteOrder;
     }
 
     public List<TiffField> getDirectoryEntries() {
         return new ArrayList<>(entries);
     }
 
     @Override
     public String getElementDescription() {
         long entryOffset = offset + TiffConstants.TIFF_DIRECTORY_HEADER_LENGTH;
 
         final StringBuilder result = new StringBuilder();
         for (final TiffField entry : entries) {
             result.append(String.format("\t[%d]: %s (%d, 0x%x), %s, %d: %s%n", entryOffset, entry.getTagInfo().name, entry.getTag(), entry.getTag(),
                     entry.getFieldType().getName(), entry.getBytesLength(), entry.getValueDescription()));
 
             entryOffset += TiffConstants.TIFF_ENTRY_LENGTH;
         }
         return result.toString();
     }
 
     public Object getFieldValue(final TagInfo tag) throws ImagingException {
         final TiffField field = findField(tag);
         if (field == null) {
             return null;
         }
         return field.getValue();
     }
 
     public String[] getFieldValue(final TagInfoAscii tag, final boolean mustExist) throws ImagingException {
         final TiffField field = findField(tag);
         if (field == null) {
             if (mustExist) {
                 throw new ImagingException("Required field \"" + tag.name + "\" is missing");
             }
             return null;
         }
         if (!tag.dataTypes.contains(field.getFieldType())) {
             if (mustExist) {
                 throw new ImagingException("Required field \"" + tag.name + "\" has incorrect type " + field.getFieldType().getName());
             }
             return null;
         }
         final byte[] bytes = field.getByteArrayValue();
         return tag.getValue(field.getByteOrder(), bytes);
     }
 
     public byte getFieldValue(final TagInfoByte tag) throws ImagingException {
         final TiffField field = findField(tag);
         if (field == null) {
             throw new ImagingException("Required field \"" + tag.name + "\" is missing");
         }
         if (!tag.dataTypes.contains(field.getFieldType())) {
             throw new ImagingException("Required field \"" + tag.name + "\" has incorrect type " + field.getFieldType().getName());
         }
         if (field.getCount() != 1) {
             throw new ImagingException("Field \"" + tag.name + "\" has wrong count " + field.getCount());
         }
         return field.getByteArrayValue()[0];
     }
 
     public byte[] getFieldValue(final TagInfoBytes tag, final boolean mustExist) throws ImagingException {
         final TiffField field = findField(tag);
         if (field == null) {
             if (mustExist) {
                 throw new ImagingException("Required field \"" + tag.name + "\" is missing");
             }
             return null;
         }
         if (!tag.dataTypes.contains(field.getFieldType())) {
             if (mustExist) {
                 throw new ImagingException("Required field \"" + tag.name + "\" has incorrect type " + field.getFieldType().getName());
             }
             return null;
         }
         return field.getByteArrayValue();
     }
 
     public double getFieldValue(final TagInfoDouble tag) throws ImagingException {
         final TiffField field = findField(tag);
         if (field == null) {
             throw new ImagingException("Required field \"" + tag.name + "\" is missing");
         }
         if (!tag.dataTypes.contains(field.getFieldType())) {
             throw new ImagingException("Required field \"" + tag.name + "\" has incorrect type " + field.getFieldType().getName());
         }
         if (field.getCount() != 1) {
             throw new ImagingException("Field \"" + tag.name + "\" has wrong count " + field.getCount());
         }
         final byte[] bytes = field.getByteArrayValue();
         return tag.getValue(field.getByteOrder(), bytes);
     }
 
     public double[] getFieldValue(final TagInfoDoubles tag, final boolean mustExist) throws ImagingException {
         final TiffField field = findField(tag);
         if (field == null) {
             if (mustExist) {
                 throw new ImagingException("Required field \"" + tag.name + "\" is missing");
             }
             return null;
         }
         if (!tag.dataTypes.contains(field.getFieldType())) {
             if (mustExist) {
                 throw new ImagingException("Required field \"" + tag.name + "\" has incorrect type " + field.getFieldType().getName());
             }
             return null;
         }
         final byte[] bytes = field.getByteArrayValue();
         return tag.getValue(field.getByteOrder(), bytes);
     }
 
     public float getFieldValue(final TagInfoFloat tag) throws ImagingException {
         final TiffField field = findField(tag);
         if (field == null) {
             throw new ImagingException("Required field \"" + tag.name + "\" is missing");
         }
         if (!tag.dataTypes.contains(field.getFieldType())) {
             throw new ImagingException("Required field \"" + tag.name + "\" has incorrect type " + field.getFieldType().getName());
         }
         if (field.getCount() != 1) {
             throw new ImagingException("Field \"" + tag.name + "\" has wrong count " + field.getCount());
         }
         final byte[] bytes = field.getByteArrayValue();
         return tag.getValue(field.getByteOrder(), bytes);
     }
 
     public float[] getFieldValue(final TagInfoFloats tag, final boolean mustExist) throws ImagingException {
         final TiffField field = findField(tag);
         if (field == null) {
             if (mustExist) {
                 throw new ImagingException("Required field \"" + tag.name + "\" is missing");
             }
             return null;
         }
         if (!tag.dataTypes.contains(field.getFieldType())) {
             if (mustExist) {
                 throw new ImagingException("Required field \"" + tag.name + "\" has incorrect type " + field.getFieldType().getName());
             }
             return null;
         }
         final byte[] bytes = field.getByteArrayValue();
         return tag.getValue(field.getByteOrder(), bytes);
     }
 
     public String getFieldValue(final TagInfoGpsText tag, final boolean mustExist) throws ImagingException {
         final TiffField field = findField(tag);
         if (field == null) {
             if (mustExist) {
                 throw new ImagingException("Required field \"" + tag.name + "\" is missing");
             }
             return null;
         }
         return tag.getValue(field);
     }
 
     public int getFieldValue(final TagInfoLong tag) throws ImagingException {
         final TiffField field = findField(tag);
         if (field == null) {
             throw new ImagingException("Required field \"" + tag.name + "\" is missing");
         }
         if (!tag.dataTypes.contains(field.getFieldType())) {
             throw new ImagingException("Required field \"" + tag.name + "\" has incorrect type " + field.getFieldType().getName());
         }
         if (field.getCount() != 1) {
             throw new ImagingException("Field \"" + tag.name + "\" has wrong count " + field.getCount());
         }
         final byte[] bytes = field.getByteArrayValue();
         return tag.getValue(field.getByteOrder(), bytes);
     }
 
     public int[] getFieldValue(final TagInfoLongs tag, final boolean mustExist) throws ImagingException {
         final TiffField field = findField(tag);
         if (field == null) {
             if (mustExist) {
                 throw new ImagingException("Required field \"" + tag.name + "\" is missing");
             }
             return null;
         }
         if (!tag.dataTypes.contains(field.getFieldType())) {
             if (mustExist) {
                 throw new ImagingException("Required field \"" + tag.name + "\" has incorrect type " + field.getFieldType().getName());
             }
             return null;
         }
         final byte[] bytes = field.getByteArrayValue();
         return tag.getValue(field.getByteOrder(), bytes);
     }
 
     public RationalNumber getFieldValue(final TagInfoRational tag) throws ImagingException {
         final TiffField field = findField(tag);
         if (field == null) {
             throw new ImagingException("Required field \"" + tag.name + "\" is missing");
         }
         if (!tag.dataTypes.contains(field.getFieldType())) {
             throw new ImagingException("Required field \"" + tag.name + "\" has incorrect type " + field.getFieldType().getName());
         }
         if (field.getCount() != 1) {
             throw new ImagingException("Field \"" + tag.name + "\" has wrong count " + field.getCount());
         }
         final byte[] bytes = field.getByteArrayValue();
         return tag.getValue(field.getByteOrder(), bytes);
     }
 
     public RationalNumber[] getFieldValue(final TagInfoRationals tag, final boolean mustExist) throws ImagingException {
         final TiffField field = findField(tag);
         if (field == null) {
             if (mustExist) {
                 throw new ImagingException("Required field \"" + tag.name + "\" is missing");
             }
             return null;
         }
         if (!tag.dataTypes.contains(field.getFieldType())) {
             if (mustExist) {
                 throw new ImagingException("Required field \"" + tag.name + "\" has incorrect type " + field.getFieldType().getName());
             }
             return null;
         }
         final byte[] bytes = field.getByteArrayValue();
         return tag.getValue(field.getByteOrder(), bytes);
     }
 
     public byte getFieldValue(final TagInfoSByte tag) throws ImagingException {
         final TiffField field = findField(tag);
         if (field == null) {
             throw new ImagingException("Required field \"" + tag.name + "\" is missing");
         }
         if (!tag.dataTypes.contains(field.getFieldType())) {
             throw new ImagingException("Required field \"" + tag.name + "\" has incorrect type " + field.getFieldType().getName());
         }
         if (field.getCount() != 1) {
             throw new ImagingException("Field \"" + tag.name + "\" has wrong count " + field.getCount());
         }
         return field.getByteArrayValue()[0];
     }
 
     public byte[] getFieldValue(final TagInfoSBytes tag, final boolean mustExist) throws ImagingException {
         final TiffField field = findField(tag);
         if (field == null) {
             if (mustExist) {
                 throw new ImagingException("Required field \"" + tag.name + "\" is missing");
             }
             return null;
         }
         if (!tag.dataTypes.contains(field.getFieldType())) {
             if (mustExist) {
                 throw new ImagingException("Required field \"" + tag.name + "\" has incorrect type " + field.getFieldType().getName());
             }
             return null;
         }
         return field.getByteArrayValue();
     }
 
     public short getFieldValue(final TagInfoShort tag) throws ImagingException {
         final TiffField field = findField(tag);
         if (field == null) {
             throw new ImagingException("Required field \"" + tag.name + "\" is missing");
         }
         if (!tag.dataTypes.contains(field.getFieldType())) {
             throw new ImagingException("Required field \"" + tag.name + "\" has incorrect type " + field.getFieldType().getName());
         }
         if (field.getCount() != 1) {
             throw new ImagingException("Field \"" + tag.name + "\" has wrong count " + field.getCount());
         }
         final byte[] bytes = field.getByteArrayValue();
         return tag.getValue(field.getByteOrder(), bytes);
     }
 
     public int[] getFieldValue(final TagInfoShortOrLong tag, final boolean mustExist) throws ImagingException {
         final TiffField field = findField(tag);
         if (field == null) {
             if (mustExist) {
                 throw new ImagingException("Required field \"" + tag.name + "\" is missing");
             }
             return null;
         }
         if (!tag.dataTypes.contains(field.getFieldType())) {
             if (mustExist) {
                 throw new ImagingException("Required field \"" + tag.name + "\" has incorrect type " + field.getFieldType().getName());
             }
             return null;
         }
         final byte[] bytes = field.getByteArrayValue();
         if (field.getFieldType() == AbstractFieldType.SHORT) {
             return ByteConversions.toUInt16s(bytes, field.getByteOrder());
         }
         return ByteConversions.toInts(bytes, field.getByteOrder());
     }
 
     public short[] getFieldValue(final TagInfoShorts tag, final boolean mustExist) throws ImagingException {
         final TiffField field = findField(tag);
         if (field == null) {
             if (mustExist) {
                 throw new ImagingException("Required field \"" + tag.name + "\" is missing");
             }
             return null;
         }
         if (!tag.dataTypes.contains(field.getFieldType())) {
             if (mustExist) {
                 throw new ImagingException("Required field \"" + tag.name + "\" has incorrect type " + field.getFieldType().getName());
             }
             return null;
         }
         final byte[] bytes = field.getByteArrayValue();
         return tag.getValue(field.getByteOrder(), bytes);
     }
 
     public int getFieldValue(final TagInfoSLong tag) throws ImagingException {
         final TiffField field = findField(tag);
         if (field == null) {
             throw new ImagingException("Required field \"" + tag.name + "\" is missing");
         }
         if (!tag.dataTypes.contains(field.getFieldType())) {
             throw new ImagingException("Required field \"" + tag.name + "\" has incorrect type " + field.getFieldType().getName());
         }
         if (field.getCount() != 1) {
             throw new ImagingException("Field \"" + tag.name + "\" has wrong count " + field.getCount());
         }
         final byte[] bytes = field.getByteArrayValue();
         return tag.getValue(field.getByteOrder(), bytes);
     }
 
     public int[] getFieldValue(final TagInfoSLongs tag, final boolean mustExist) throws ImagingException {
         final TiffField field = findField(tag);
         if (field == null) {
             if (mustExist) {
                 throw new ImagingException("Required field \"" + tag.name + "\" is missing");
             }
             return null;
         }
         if (!tag.dataTypes.contains(field.getFieldType())) {
             if (mustExist) {
                 throw new ImagingException("Required field \"" + tag.name + "\" has incorrect type " + field.getFieldType().getName());
             }
             return null;
         }
         final byte[] bytes = field.getByteArrayValue();
         return tag.getValue(field.getByteOrder(), bytes);
     }
 
     public RationalNumber getFieldValue(final TagInfoSRational tag) throws ImagingException {
         final TiffField field = findField(tag);
         if (field == null) {
             throw new ImagingException("Required field \"" + tag.name + "\" is missing");
         }
         if (!tag.dataTypes.contains(field.getFieldType())) {
             throw new ImagingException("Required field \"" + tag.name + "\" has incorrect type " + field.getFieldType().getName());
         }
         if (field.getCount() != 1) {
             throw new ImagingException("Field \"" + tag.name + "\" has wrong count " + field.getCount());
         }
         final byte[] bytes = field.getByteArrayValue();
         return tag.getValue(field.getByteOrder(), bytes);
     }
 
     public RationalNumber[] getFieldValue(final TagInfoSRationals tag, final boolean mustExist) throws ImagingException {
         final TiffField field = findField(tag);
         if (field == null) {
             if (mustExist) {
                 throw new ImagingException("Required field \"" + tag.name + "\" is missing");
             }
             return null;
         }
         if (!tag.dataTypes.contains(field.getFieldType())) {
             if (mustExist) {
                 throw new ImagingException("Required field \"" + tag.name + "\" has incorrect type " + field.getFieldType().getName());
             }
             return null;
         }
         final byte[] bytes = field.getByteArrayValue();
         return tag.getValue(field.getByteOrder(), bytes);
     }
 
     public short getFieldValue(final TagInfoSShort tag) throws ImagingException {
         final TiffField field = findField(tag);
         if (field == null) {
             throw new ImagingException("Required field \"" + tag.name + "\" is missing");
         }
         if (!tag.dataTypes.contains(field.getFieldType())) {
             throw new ImagingException("Required field \"" + tag.name + "\" has incorrect type " + field.getFieldType().getName());
         }
         if (field.getCount() != 1) {
             throw new ImagingException("Field \"" + tag.name + "\" has wrong count " + field.getCount());
         }
         final byte[] bytes = field.getByteArrayValue();
         return tag.getValue(field.getByteOrder(), bytes);
     }
 
     public short[] getFieldValue(final TagInfoSShorts tag, final boolean mustExist) throws ImagingException {
         final TiffField field = findField(tag);
         if (field == null) {
             if (mustExist) {
                 throw new ImagingException("Required field \"" + tag.name + "\" is missing");
             }
             return null;
         }
         if (!tag.dataTypes.contains(field.getFieldType())) {
             if (mustExist) {
                 throw new ImagingException("Required field \"" + tag.name + "\" has incorrect type " + field.getFieldType().getName());
             }
             return null;
         }
         final byte[] bytes = field.getByteArrayValue();
         return tag.getValue(field.getByteOrder(), bytes);
     }
 
     public String getFieldValue(final TagInfoXpString tag, final boolean mustExist) throws ImagingException {
         final TiffField field = findField(tag);
         if (field == null) {
             if (mustExist) {
                 throw new ImagingException("Required field \"" + tag.name + "\" is missing");
             }
             return null;
         }
         return tag.getValue(field);
     }
 
     public JpegImageData getJpegImageData() {
         return jpegImageData;
     }
 
     public ImageDataElement getJpegRawImageDataElement() throws ImagingException {
         final TiffField jpegInterchangeFormat = findField(TiffTagConstants.TIFF_TAG_JPEG_INTERCHANGE_FORMAT);
         final TiffField jpegInterchangeFormatLength = findField(TiffTagConstants.TIFF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH);
 
         if (jpegInterchangeFormat != null && jpegInterchangeFormatLength != null) {
             final int offSet = jpegInterchangeFormat.getIntArrayValue()[0];
             final int byteCount = jpegInterchangeFormatLength.getIntArrayValue()[0];
 
             return new ImageDataElement(offSet, byteCount);
         }
         throw new ImagingException("Couldn't find image data.");
     }
 
     public long getNextDirectoryOffset() {
         return nextDirectoryOffset;
     }
 
     /**
      * Reads the numerical data stored in this TIFF directory, if available. Note that this method is defined only for TIFF directories that contain
      * floating-point data or two-byte signed integer data.
      * <p>
      * TIFF directories that provide numerical data do not directly specify images, though it is possible to interpret the data as an image using this library.
      * TIFF files may contain multiple directories which are allowed to have different formats. Thus it is possible for a TIFF file to contain a mix of image
      * and floating-point raster data.
      * <p>
      * If desired, sub-image data can be read from the file by using a Java Map instance to specify the subsection of the image that is required. The following
      * code illustrates the approach:
      *
      * <pre>
      * int x; // coordinate (column) of corner of sub-image
      * int y; // coordinate (row) of corner of sub-image
      * int width; // width of sub-image
      * int height; // height of sub-image
      *
      * Map&lt;String, Object&gt; params = new HashMap&lt;&gt;();
      * params.put(TiffConstants.PARAM_KEY_SUBIMAGE_X, x);
      * params.put(TiffConstants.PARAM_KEY_SUBIMAGE_Y, y);
      * params.put(TiffConstants.PARAM_KEY_SUBIMAGE_WIDTH, width);
      * params.put(TiffConstants.PARAM_KEY_SUBIMAGE_HEIGHT, height);
      * TiffRasterData raster = directory.readFloatingPointRasterData(params);
      * </pre>
      *
      * @param params an optional parameter map instance
      * @return a valid instance
      * @throws ImagingException in the event of incompatible or malformed data
      * @throws IOException      in the event of an I/O error
      */
     public TiffRasterData getRasterData(final TiffImagingParameters params) throws ImagingException, IOException {
 
         final TiffImageParser parser = new TiffImageParser();
         return parser.getRasterData(this, headerByteOrder, params);
     }
 
     private List<ImageDataElement> getRawImageDataElements(final TiffField offsetsField, final TiffField byteCountsField) throws ImagingException {
         final long[] offsets = offsetsField.getLongArrayValue();
         final int[] byteCounts = byteCountsField.getIntArrayValue();
 
         if (offsets.length != byteCounts.length) {
             throw new ImagingException("offsets.length(" + offsets.length + ") != byteCounts.length(" + byteCounts.length + ")");
         }
 
         final List<ImageDataElement> result = Allocator.arrayList(offsets.length);
         for (int i = 0; i < offsets.length; i++) {
             result.add(new ImageDataElement(offsets[i], byteCounts[i]));
         }
         return result;
     }
 
     public String getSingleFieldValue(final TagInfoAscii tag) throws ImagingException {
         final String[] result = getFieldValue(tag, true);
         if (result.length != 1) {
             throw new ImagingException("Field \"" + tag.name + "\" has incorrect length " + result.length);
         }
         return result[0];
     }
 
     public int getSingleFieldValue(final TagInfoShortOrLong tag) throws ImagingException {
         final int[] result = getFieldValue(tag, true);
         if (result.length != 1) {
             throw new ImagingException("Field \"" + tag.name + "\" has incorrect length " + result.length);
         }
         return result[0];
     }
 
     /**
      * Gets the image associated with the directory, if any. Note that not all directories contain images.
      *
      * @return if successful, a valid BufferedImage instance.
      * @throws ImagingException in the event of an invalid or incompatible data format.
      * @throws IOException      in the event of an I/O error.
      */
     public BufferedImage getTiffImage() throws ImagingException, IOException {
         if (null == abstractTiffImageData) {
             return null;
         }
 
         return new TiffImageParser().getBufferedImage(this, headerByteOrder, null);
     }
 
     /**
      * Gets the image associated with the directory, if any. Note that not all directories contain images.
      * <p>
      * This method comes from an older version of this class in which byte order was required from an external source. Developers are encouraged to use the
      * simpler version of getTiffImage that does not require the byte-order argument.
      *
      * @param byteOrder byte-order obtained from the containing TIFF file
      * @return if successful, a valid BufferedImage instance.
      * @throws ImagingException in the event of an invalid or incompatible data format.
      * @throws IOException      in the event of an I/O error.
      */
     public BufferedImage getTiffImage(final ByteOrder byteOrder) throws ImagingException, IOException {
         return getTiffImage(byteOrder, new TiffImagingParameters());
     }
 
     /**
      * Gets the image associated with the directory, if any. Note that not all directories contain images.
      * <p>
      * This method comes from an older version of this class in which byte order was required from an external source. Developers are encouraged to use the
      * simpler version of getTiffImage that does not require the byte-order argument.
      *
      * @param byteOrder byte-order obtained from the containing TIFF file
      * @param params    an object containing optional parameters to be applied to the read operation.
      * @return if successful, a valid BufferedImage instance.
      * @throws ImagingException in the event of an invalid or incompatible data format.
      * @throws IOException      in the event of an I/O error.
      */
     public BufferedImage getTiffImage(final ByteOrder byteOrder, final TiffImagingParameters params) throws ImagingException, IOException {
         if (null == abstractTiffImageData) {
             return null;
         }
 
         return new TiffImageParser().getBufferedImage(this, byteOrder, params);
     }
 
     /**
      * Gets the image associated with the directory, if any. Note that not all directories contain images.
      * <p>
      * The optional parameters object can be used to specify image access or rendering options such as reading only a part of the overall image (i.e. reading a
      * sub-image) or applying a custom photometric interpreter.
      *
      * @param params an object containing optional parameters to be applied to the read operation.
      * @return if successful, a valid BufferedImage instance.
      * @throws ImagingException in the event of an invalid or incompatible data format.
      * @throws IOException      in the event of an I/O error.
      */
     public BufferedImage getTiffImage(final TiffImagingParameters params) throws ImagingException, IOException {
         if (null == abstractTiffImageData) {
             return null;
         }
 
         return new TiffImageParser().getBufferedImage(this, headerByteOrder, params);
     }
 
     public AbstractTiffImageData getTiffImageData() {
         return abstractTiffImageData;
     }
 
     public List<ImageDataElement> getTiffRawImageDataElements() throws ImagingException {
         final TiffField tileOffsets = findField(TiffTagConstants.TIFF_TAG_TILE_OFFSETS);
         final TiffField tileByteCounts = findField(TiffTagConstants.TIFF_TAG_TILE_BYTE_COUNTS);
         final TiffField stripOffsets = findField(TiffTagConstants.TIFF_TAG_STRIP_OFFSETS);
         final TiffField stripByteCounts = findField(TiffTagConstants.TIFF_TAG_STRIP_BYTE_COUNTS);
 
         if (tileOffsets != null && tileByteCounts != null) {
             return getRawImageDataElements(tileOffsets, tileByteCounts);
         }
         if (stripOffsets != null && stripByteCounts != null) {
             return getRawImageDataElements(stripOffsets, stripByteCounts);
         }
         throw new ImagingException("Couldn't find image data.");
     }
 
     public boolean hasJpegImageData() throws ImagingException {
         return null != findField(TiffTagConstants.TIFF_TAG_JPEG_INTERCHANGE_FORMAT);
     }
 
     /**
      * Indicates whether the directory definition specifies a float-point data format.
      *
      * @return {@code true} if the directory contains floating point data; otherwise, {@code false}
      *
      * @throws ImagingException in the event of an invalid or malformed specification.
      */
     public boolean hasTiffFloatingPointRasterData() throws ImagingException {
         if (!this.hasTiffImageData()) {
             return false;
         }
         final short[] s = getFieldValue(TiffTagConstants.TIFF_TAG_SAMPLE_FORMAT, false);
         return s != null && s.length > 0 && s[0] == TiffTagConstants.SAMPLE_FORMAT_VALUE_IEEE_FLOATING_POINT;
 
     }
 
     public boolean hasTiffImageData() throws ImagingException {
         if (null != findField(TiffTagConstants.TIFF_TAG_TILE_OFFSETS)) {
             return true;
         }
 
         return null != findField(TiffTagConstants.TIFF_TAG_STRIP_OFFSETS);
     }
 
     /**
      * Indicates whether the content associated with the directory is given in a supported numerical-data format. If this method returns {@code true}, the
      * Imaging API will be able to extract a TiffRasterData instance from the associated TIFF file using this directory.
      *
      * @return {@code true} if the directory contains a supported raster data format; otherwise, {@code false}.
      * @throws ImagingException in the event of an invalid or malformed specification.
      */
     public boolean hasTiffRasterData() throws ImagingException {
         if (!this.hasTiffImageData()) {
             return false;
         }
         final short[] s = getFieldValue(TiffTagConstants.TIFF_TAG_SAMPLE_FORMAT, false);
         return s != null && s.length > 0 && (s[0] == TiffTagConstants.SAMPLE_FORMAT_VALUE_IEEE_FLOATING_POINT
                 || s[0] == TiffTagConstants.SAMPLE_FORMAT_VALUE_TWOS_COMPLEMENT_SIGNED_INTEGER);
     }
 
     public boolean imageDataInStrips() throws ImagingException {
         final TiffField tileOffsets = findField(TiffTagConstants.TIFF_TAG_TILE_OFFSETS);
         final TiffField tileByteCounts = findField(TiffTagConstants.TIFF_TAG_TILE_BYTE_COUNTS);
         final TiffField stripOffsets = findField(TiffTagConstants.TIFF_TAG_STRIP_OFFSETS);
         final TiffField stripByteCounts = findField(TiffTagConstants.TIFF_TAG_STRIP_BYTE_COUNTS);
 
         if (tileOffsets != null && tileByteCounts != null) {
             return false;
         }
         if (stripOffsets != null && stripByteCounts != null) {
             return true;
         }
         throw new ImagingException("Couldn't find image data.");
     }
 
     @Override
     public Iterator<TiffField> iterator() {
         return entries.iterator();
     }
 
     public void setJpegImageData(final JpegImageData value) {
         this.jpegImageData = value;
     }
 
     public void setTiffImageData(final AbstractTiffImageData rawImageData) {
         this.abstractTiffImageData = rawImageData;
     }
 
     public int size() {
         return entries.size();
     }
 }