/*
* Copyright 2002-2012 Drew Noakes
*
* Licensed 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.
*
* More information about this project is available at:
*
* http://drewnoakes.com/code/exif/
* http://code.google.com/p/metadata-extractor/
*/
package com.drew.metadata.exif;
import com.drew.lang.BufferBoundsException;
import com.drew.lang.BufferReader;
import com.drew.lang.Rational;
import com.drew.lang.annotations.NotNull;
import com.drew.metadata.Directory;
import com.drew.metadata.Metadata;
import com.drew.metadata.MetadataReader;
import java.util.HashSet;
import java.util.Set;
/**
* Decodes Exif binary data, populating a {@link Metadata} object with tag values in {@link ExifSubIFDDirectory},
* {@link ExifThumbnailDirectory}, {@link ExifInteropDirectory}, {@link GpsDirectory} and one of the many camera makernote directories.
*
* @author Drew Noakes http://drewnoakes.com
*/
public class ExifReader implements MetadataReader
{
// TODO extract a reusable TiffReader from this class with hooks for special tag handling and subdir following
/** The number of bytes used per format descriptor. */
@NotNull
private static final int[] BYTES_PER_FORMAT = { 0, 1, 1, 2, 4, 8, 1, 1, 2, 4, 8, 4, 8 };
/** The number of formats known. */
private static final int MAX_FORMAT_CODE = 12;
// Format types
// TODO use an enum for these?
/** An 8-bit unsigned integer. */
private static final int FMT_BYTE = 1;
/** A fixed-length character string. */
private static final int FMT_STRING = 2;
/** An unsigned 16-bit integer. */
private static final int FMT_USHORT = 3;
/** An unsigned 32-bit integer. */
private static final int FMT_ULONG = 4;
private static final int FMT_URATIONAL = 5;
/** An 8-bit signed integer. */
private static final int FMT_SBYTE = 6;
private static final int FMT_UNDEFINED = 7;
/** A signed 16-bit integer. */
private static final int FMT_SSHORT = 8;
/** A signed 32-bit integer. */
private static final int FMT_SLONG = 9;
private static final int FMT_SRATIONAL = 10;
/** A 32-bit floating point number. */
private static final int FMT_SINGLE = 11;
/** A 64-bit floating point number. */
private static final int FMT_DOUBLE = 12;
/** This tag is a pointer to the Exif SubIFD. */
public static final int TAG_EXIF_SUB_IFD_OFFSET = 0x8769;
/** This tag is a pointer to the Exif Interop IFD. */
public static final int TAG_INTEROP_OFFSET = 0xA005;
/** This tag is a pointer to the Exif GPS IFD. */
public static final int TAG_GPS_INFO_OFFSET = 0x8825;
/** This tag is a pointer to the Exif Makernote IFD. */
public static final int TAG_MAKER_NOTE_OFFSET = 0x927C;
public static final int TIFF_HEADER_START_OFFSET = 6;
/**
* Performs the Exif data extraction, adding found values to the specified
* instance of <code>Metadata</code>.
*
* @param reader The buffer reader from which Exif data should be read.
* @param metadata The Metadata object into which extracted values should be merged.
*/
public void extract(@NotNull final BufferReader reader, @NotNull Metadata metadata)
{
final ExifSubIFDDirectory directory = metadata.getOrCreateDirectory(ExifSubIFDDirectory.class);
// check for the header length
if (reader.getLength() <= 14) {
directory.addError("Exif data segment must contain at least 14 bytes");
return;
}
// check for the header preamble
try {
if (!reader.getString(0, 6).equals("Exif\0\0")) {
directory.addError("Exif data segment doesn't begin with 'Exif'");
return;
}
extractIFD(metadata, metadata.getOrCreateDirectory(ExifIFD0Directory.class), TIFF_HEADER_START_OFFSET, reader);
} catch (BufferBoundsException e) {
directory.addError("Exif data segment ended prematurely");
}
}
/**
* Performs the Exif data extraction on a TIFF/RAW, adding found values to the specified
* instance of <code>Metadata</code>.
*
* @param reader The BufferReader from which TIFF data should be read.
* @param metadata The Metadata object into which extracted values should be merged.
*/
public void extractTiff(@NotNull BufferReader reader, @NotNull Metadata metadata)
{
final ExifIFD0Directory directory = metadata.getOrCreateDirectory(ExifIFD0Directory.class);
try {
extractIFD(metadata, directory, 0, reader);
} catch (BufferBoundsException e) {
directory.addError("Exif data segment ended prematurely");
}
}
private void extractIFD(@NotNull Metadata metadata, @NotNull final ExifIFD0Directory directory, int tiffHeaderOffset, @NotNull BufferReader reader) throws BufferBoundsException
{
// this should be either "MM" or "II"
String byteOrderIdentifier = reader.getString(tiffHeaderOffset, 2);
if ("MM".equals(byteOrderIdentifier)) {
reader.setMotorolaByteOrder(true);
} else if ("II".equals(byteOrderIdentifier)) {
reader.setMotorolaByteOrder(false);
} else {
directory.addError("Unclear distinction between Motorola/Intel byte ordering: " + byteOrderIdentifier);
return;
}
// Check the next two values for correctness.
if (reader.getUInt16(2 + tiffHeaderOffset) != 0x2a) {
directory.addError("Invalid Exif start - should have 0x2A at offset 8 in Exif header");
return;
}
int firstDirectoryOffset = reader.getInt32(4 + tiffHeaderOffset) + tiffHeaderOffset;
// David Ekholm sent a digital camera image that has this problem
if (firstDirectoryOffset >= reader.getLength() - 1) {
directory.addError("First exif directory offset is beyond end of Exif data segment");
// First directory normally starts 14 bytes in -- try it here and catch another error in the worst case
firstDirectoryOffset = 14;
}
Set<Integer> processedDirectoryOffsets = new HashSet<Integer>();
processDirectory(directory, processedDirectoryOffsets, firstDirectoryOffset, tiffHeaderOffset, metadata, reader);
// after the extraction process, if we have the correct tags, we may be able to store thumbnail information
ExifThumbnailDirectory thumbnailDirectory = metadata.getDirectory(ExifThumbnailDirectory.class);
if (thumbnailDirectory!=null && thumbnailDirectory.containsTag(ExifThumbnailDirectory.TAG_THUMBNAIL_COMPRESSION)) {
Integer offset = thumbnailDirectory.getInteger(ExifThumbnailDirectory.TAG_THUMBNAIL_OFFSET);
Integer length = thumbnailDirectory.getInteger(ExifThumbnailDirectory.TAG_THUMBNAIL_LENGTH);
if (offset != null && length != null) {
try {
byte[] thumbnailData = reader.getBytes(tiffHeaderOffset + offset, length);
thumbnailDirectory.setThumbnailData(thumbnailData);
} catch (BufferBoundsException ex) {
directory.addError("Invalid thumbnail data specification: " + ex.getMessage());
}
}
}
}
/**
* Process one of the nested Tiff IFD directories.
* <p/>
* Header
* 2 bytes: number of tags
* <p/>
* Then for each tag
* 2 bytes: tag type
* 2 bytes: format code
* 4 bytes: component count
*/
private void processDirectory(@NotNull Directory directory, @NotNull Set<Integer> processedDirectoryOffsets, int dirStartOffset, int tiffHeaderOffset, @NotNull final Metadata metadata, @NotNull final BufferReader reader) throws BufferBoundsException
{
// check for directories we've already visited to avoid stack overflows when recursive/cyclic directory structures exist
if (processedDirectoryOffsets.contains(Integer.valueOf(dirStartOffset)))
return;
// remember that we've visited this directory so that we don't visit it again later
processedDirectoryOffsets.add(dirStartOffset);
if (dirStartOffset >= reader.getLength() || dirStartOffset < 0) {
directory.addError("Ignored directory marked to start outside data segment");
return;
}
// First two bytes in the IFD are the number of tags in this directory
int dirTagCount = reader.getUInt16(dirStartOffset);
int dirLength = (2 + (12 * dirTagCount) + 4);
if (dirLength + dirStartOffset > reader.getLength()) {
directory.addError("Illegally sized directory");
return;
}
// Handle each tag in this directory
for (int tagNumber = 0; tagNumber < dirTagCount; tagNumber++) {
final int tagOffset = calculateTagOffset(dirStartOffset, tagNumber);
// 2 bytes for the tag type
final int tagType = reader.getUInt16(tagOffset);
// 2 bytes for the format code
final int formatCode = reader.getUInt16(tagOffset + 2);
if (formatCode < 1 || formatCode > MAX_FORMAT_CODE) {
// This error suggests that we are processing at an incorrect index and will generate
// rubbish until we go out of bounds (which may be a while). Exit now.
directory.addError("Invalid TIFF tag format code: " + formatCode);
return;
}
// 4 bytes dictate the number of components in this tag's data
final int componentCount = reader.getInt32(tagOffset + 4);
if (componentCount < 0) {
directory.addError("Negative TIFF tag component count");
continue;
}
// each component may have more than one byte... calculate the total number of bytes
final int byteCount = componentCount * BYTES_PER_FORMAT[formatCode];
final int tagValueOffset;
if (byteCount > 4) {
// If it's bigger than 4 bytes, the dir entry contains an offset.
// dirEntryOffset must be passed, as some makernote implementations (e.g. FujiFilm) incorrectly use an
// offset relative to the start of the makernote itself, not the TIFF segment.
final int offsetVal = reader.getInt32(tagOffset + 8);
if (offsetVal + byteCount > reader.getLength()) {
// Bogus pointer offset and / or byteCount value
directory.addError("Illegal TIFF tag pointer offset");
continue;
}
tagValueOffset = tiffHeaderOffset + offsetVal;
} else {
// 4 bytes or less and value is in the dir entry itself
tagValueOffset = tagOffset + 8;
}
if (tagValueOffset < 0 || tagValueOffset > reader.getLength()) {
directory.addError("Illegal TIFF tag pointer offset");
continue;
}
// Check that this tag isn't going to allocate outside the bounds of the data array.
// This addresses an uncommon OutOfMemoryError.
if (byteCount < 0 || tagValueOffset + byteCount > reader.getLength()) {
directory.addError("Illegal number of bytes: " + byteCount);
continue;
}
switch (tagType) {
case TAG_EXIF_SUB_IFD_OFFSET: {
final int subdirOffset = tiffHeaderOffset + reader.getInt32(tagValueOffset);
processDirectory(metadata.getOrCreateDirectory(ExifSubIFDDirectory.class), processedDirectoryOffsets, subdirOffset, tiffHeaderOffset, metadata, reader);
continue;
}
case TAG_INTEROP_OFFSET: {
final int subdirOffset = tiffHeaderOffset + reader.getInt32(tagValueOffset);
processDirectory(metadata.getOrCreateDirectory(ExifInteropDirectory.class), processedDirectoryOffsets, subdirOffset, tiffHeaderOffset, metadata, reader);
continue;
}
case TAG_GPS_INFO_OFFSET: {
final int subdirOffset = tiffHeaderOffset + reader.getInt32(tagValueOffset);
processDirectory(metadata.getOrCreateDirectory(GpsDirectory.class), processedDirectoryOffsets, subdirOffset, tiffHeaderOffset, metadata, reader);
continue;
}
case TAG_MAKER_NOTE_OFFSET: {
processMakerNote(tagValueOffset, processedDirectoryOffsets, tiffHeaderOffset, metadata, reader);
continue;
}
default: {
processTag(directory, tagType, tagValueOffset, componentCount, formatCode, reader);
break;
}
}
}
// at the end of each IFD is an optional link to the next IFD
final int finalTagOffset = calculateTagOffset(dirStartOffset, dirTagCount);
int nextDirectoryOffset = reader.getInt32(finalTagOffset);
if (nextDirectoryOffset != 0) {
nextDirectoryOffset += tiffHeaderOffset;
if (nextDirectoryOffset >= reader.getLength()) {
// Last 4 bytes of IFD reference another IFD with an address that is out of bounds
// Note this could have been caused by jhead 1.3 cropping too much
return;
} else if (nextDirectoryOffset < dirStartOffset) {
// Last 4 bytes of IFD reference another IFD with an address that is before the start of this directory
return;
}
// TODO in Exif, the only known 'follower' IFD is the thumbnail one, however this may not be the case
final ExifThumbnailDirectory nextDirectory = metadata.getOrCreateDirectory(ExifThumbnailDirectory.class);
processDirectory(nextDirectory, processedDirectoryOffsets, nextDirectoryOffset, tiffHeaderOffset, metadata, reader);
}
}
private void processMakerNote(int subdirOffset, @NotNull Set<Integer> processedDirectoryOffsets, int tiffHeaderOffset, @NotNull final Metadata metadata, @NotNull BufferReader reader) throws BufferBoundsException
{
// Determine the camera model and makernote format
Directory ifd0Directory = metadata.getDirectory(ExifIFD0Directory.class);
if (ifd0Directory==null)
return;
String cameraModel = ifd0Directory.getString(ExifIFD0Directory.TAG_MAKE);
//final String firstTwoChars = reader.getString(subdirOffset, 2);
final String firstThreeChars = reader.getString(subdirOffset, 3);
final String firstFourChars = reader.getString(subdirOffset, 4);
final String firstFiveChars = reader.getString(subdirOffset, 5);
final String firstSixChars = reader.getString(subdirOffset, 6);
final String firstSevenChars = reader.getString(subdirOffset, 7);
final String firstEightChars = reader.getString(subdirOffset, 8);
final String firstTwelveChars = reader.getString(subdirOffset, 12);
if ("OLYMP".equals(firstFiveChars) || "EPSON".equals(firstFiveChars) || "AGFA".equals(firstFourChars)) {
// Olympus Makernote
// Epson and Agfa use Olympus maker note standard: http://www.ozhiker.com/electronics/pjmt/jpeg_info/
processDirectory(metadata.getOrCreateDirectory(OlympusMakernoteDirectory.class), processedDirectoryOffsets, subdirOffset + 8, tiffHeaderOffset, metadata, reader);
} else if (cameraModel != null && cameraModel.trim().toUpperCase().startsWith("NIKON")) {
if ("Nikon".equals(firstFiveChars)) {
/* There are two scenarios here:
* Type 1: **
* :0000: 4E 69 6B 6F 6E 00 01 00-05 00 02 00 02 00 06 00 Nikon...........
* :0010: 00 00 EC 02 00 00 03 00-03 00 01 00 00 00 06 00 ................
* Type 3: **
* :0000: 4E 69 6B 6F 6E 00 02 00-00 00 4D 4D 00 2A 00 00 Nikon....MM.*...
* :0010: 00 08 00 1E 00 01 00 07-00 00 00 04 30 32 30 30 ............0200
*/
switch (reader.getUInt8(subdirOffset + 6)) {
case 1:
processDirectory(metadata.getOrCreateDirectory(NikonType1MakernoteDirectory.class), processedDirectoryOffsets, subdirOffset + 8, tiffHeaderOffset, metadata, reader);
break;
case 2:
processDirectory(metadata.getOrCreateDirectory(NikonType2MakernoteDirectory.class), processedDirectoryOffsets, subdirOffset + 18, subdirOffset + 10, metadata, reader);
break;
default:
ifd0Directory.addError("Unsupported Nikon makernote data ignored.");
break;
}
} else {
// The IFD begins with the first MakerNote byte (no ASCII name). This occurs with CoolPix 775, E990 and D1 models.
processDirectory(metadata.getOrCreateDirectory(NikonType2MakernoteDirectory.class), processedDirectoryOffsets, subdirOffset, tiffHeaderOffset, metadata, reader);
}
} else if ("SONY CAM".equals(firstEightChars) || "SONY DSC".equals(firstEightChars)) {
processDirectory(metadata.getOrCreateDirectory(SonyType1MakernoteDirectory.class), processedDirectoryOffsets, subdirOffset + 12, tiffHeaderOffset, metadata, reader);
} else if ("SIGMA\u0000\u0000\u0000".equals(firstEightChars) || "FOVEON\u0000\u0000".equals(firstEightChars)) {
processDirectory(metadata.getOrCreateDirectory(SigmaMakernoteDirectory.class), processedDirectoryOffsets, subdirOffset + 10, tiffHeaderOffset, metadata, reader);
} else if ("SEMC MS\u0000\u0000\u0000\u0000\u0000".equals(firstTwelveChars)) {
// force MM for this directory
boolean isMotorola = reader.isMotorolaByteOrder();
reader.setMotorolaByteOrder(true);
// skip 12 byte header + 2 for "MM" + 6
processDirectory(metadata.getOrCreateDirectory(SonyType6MakernoteDirectory.class), processedDirectoryOffsets, subdirOffset + 20, tiffHeaderOffset, metadata, reader);
reader.setMotorolaByteOrder(isMotorola);
} else if ("KDK".equals(firstThreeChars)) {
processDirectory(metadata.getOrCreateDirectory(KodakMakernoteDirectory.class), processedDirectoryOffsets, subdirOffset + 20, tiffHeaderOffset, metadata, reader);
} else if ("Canon".equalsIgnoreCase(cameraModel)) {
processDirectory(metadata.getOrCreateDirectory(CanonMakernoteDirectory.class), processedDirectoryOffsets, subdirOffset, tiffHeaderOffset, metadata, reader);
} else if (cameraModel != null && cameraModel.toUpperCase().startsWith("CASIO")) {
if ("QVC\u0000\u0000\u0000".equals(firstSixChars))
processDirectory(metadata.getOrCreateDirectory(CasioType2MakernoteDirectory.class), processedDirectoryOffsets, subdirOffset + 6, tiffHeaderOffset, metadata, reader);
else
processDirectory(metadata.getOrCreateDirectory(CasioType1MakernoteDirectory.class), processedDirectoryOffsets, subdirOffset, tiffHeaderOffset, metadata, reader);
} else if ("FUJIFILM".equals(firstEightChars) || "Fujifilm".equalsIgnoreCase(cameraModel)) {
boolean byteOrderBefore = reader.isMotorolaByteOrder();
// bug in fujifilm makernote ifd means we temporarily use Intel byte ordering
reader.setMotorolaByteOrder(false);
// the 4 bytes after "FUJIFILM" in the makernote point to the start of the makernote
// IFD, though the offset is relative to the start of the makernote, not the TIFF
// header (like everywhere else)
int ifdStart = subdirOffset + reader.getInt32(subdirOffset + 8);
processDirectory(metadata.getOrCreateDirectory(FujifilmMakernoteDirectory.class), processedDirectoryOffsets, ifdStart, tiffHeaderOffset, metadata, reader);
reader.setMotorolaByteOrder(byteOrderBefore);
} else if (cameraModel != null && cameraModel.toUpperCase().startsWith("MINOLTA")) {
// Cases seen with the model starting with MINOLTA in capitals seem to have a valid Olympus makernote
// area that commences immediately.
processDirectory(metadata.getOrCreateDirectory(OlympusMakernoteDirectory.class), processedDirectoryOffsets, subdirOffset, tiffHeaderOffset, metadata, reader);
} else if ("KYOCERA".equals(firstSevenChars)) {
// http://www.ozhiker.com/electronics/pjmt/jpeg_info/kyocera_mn.html
processDirectory(metadata.getOrCreateDirectory(KyoceraMakernoteDirectory.class), processedDirectoryOffsets, subdirOffset + 22, tiffHeaderOffset, metadata, reader);
} else if ("Panasonic\u0000\u0000\u0000".equals(reader.getString(subdirOffset, 12))) {
// NON-Standard TIFF IFD Data using Panasonic Tags. There is no Next-IFD pointer after the IFD
// Offsets are relative to the start of the TIFF header at the beginning of the EXIF segment
// more information here: http://www.ozhiker.com/electronics/pjmt/jpeg_info/panasonic_mn.html
processDirectory(metadata.getOrCreateDirectory(PanasonicMakernoteDirectory.class), processedDirectoryOffsets, subdirOffset + 12, tiffHeaderOffset, metadata, reader);
} else if ("AOC\u0000".equals(firstFourChars)) {
// NON-Standard TIFF IFD Data using Casio Type 2 Tags
// IFD has no Next-IFD pointer at end of IFD, and
// Offsets are relative to the start of the current IFD tag, not the TIFF header
// Observed for:
// - Pentax ist D
processDirectory(metadata.getOrCreateDirectory(CasioType2MakernoteDirectory.class), processedDirectoryOffsets, subdirOffset + 6, subdirOffset, metadata, reader);
} else if (cameraModel != null && (cameraModel.toUpperCase().startsWith("PENTAX") || cameraModel.toUpperCase().startsWith("ASAHI"))) {
// NON-Standard TIFF IFD Data using Pentax Tags
// IFD has no Next-IFD pointer at end of IFD, and
// Offsets are relative to the start of the current IFD tag, not the TIFF header
// Observed for:
// - PENTAX Optio 330
// - PENTAX Optio 430
processDirectory(metadata.getOrCreateDirectory(PentaxMakernoteDirectory.class), processedDirectoryOffsets, subdirOffset, subdirOffset, metadata, reader);
// } else if ("KC".equals(firstTwoChars) || "MINOL".equals(firstFiveChars) || "MLY".equals(firstThreeChars) || "+M+M+M+M".equals(firstEightChars)) {
// // This Konica data is not understood. Header identified in accordance with information at this site:
// // http://www.ozhiker.com/electronics/pjmt/jpeg_info/minolta_mn.html
// // TODO add support for minolta/konica cameras
// exifDirectory.addError("Unsupported Konica/Minolta data ignored.");
} else {
// TODO how to store makernote data when it's not from a supported camera model?
// this is difficult as the starting offset is not known. we could look for it...
}
}
private void processTag(@NotNull Directory directory, int tagType, int tagValueOffset, int componentCount, int formatCode, @NotNull final BufferReader reader) throws BufferBoundsException
{
// Directory simply stores raw values
// The display side uses a Descriptor class per directory to turn the raw values into 'pretty' descriptions
switch (formatCode) {
case FMT_UNDEFINED:
// this includes exif user comments
directory.setByteArray(tagType, reader.getBytes(tagValueOffset, componentCount));
break;
case FMT_STRING:
String string = reader.getNullTerminatedString(tagValueOffset, componentCount);
directory.setString(tagType, string);
/*
// special handling for certain known tags, proposed by Yuri Binev but left out for now,
// as it gives the false impression that the image was captured in the same timezone
// in which the string is parsed
if (tagType==ExifSubIFDDirectory.TAG_DATETIME ||
tagType==ExifSubIFDDirectory.TAG_DATETIME_ORIGINAL ||
tagType==ExifSubIFDDirectory.TAG_DATETIME_DIGITIZED) {
String[] datePatterns = {
"yyyy:MM:dd HH:mm:ss",
"yyyy:MM:dd HH:mm",
"yyyy-MM-dd HH:mm:ss",
"yyyy-MM-dd HH:mm"};
for (String datePattern : datePatterns) {
try {
DateFormat parser = new SimpleDateFormat(datePattern);
Date date = parser.parse(string);
directory.setDate(tagType, date);
break;
} catch (ParseException ex) {
// simply try the next pattern
}
}
}
*/
break;
case FMT_SRATIONAL:
if (componentCount == 1) {
directory.setRational(tagType, new Rational(reader.getInt32(tagValueOffset), reader.getInt32(tagValueOffset + 4)));
} else if (componentCount > 1) {
Rational[] rationals = new Rational[componentCount];
for (int i = 0; i < componentCount; i++)
rationals[i] = new Rational(reader.getInt32(tagValueOffset + (8 * i)), reader.getInt32(tagValueOffset + 4 + (8 * i)));
directory.setRationalArray(tagType, rationals);
}
break;
case FMT_URATIONAL:
if (componentCount == 1) {
directory.setRational(tagType, new Rational(reader.getUInt32(tagValueOffset), reader.getUInt32(tagValueOffset + 4)));
} else if (componentCount > 1) {
Rational[] rationals = new Rational[componentCount];
for (int i = 0; i < componentCount; i++)
rationals[i] = new Rational(reader.getUInt32(tagValueOffset + (8 * i)), reader.getUInt32(tagValueOffset + 4 + (8 * i)));
directory.setRationalArray(tagType, rationals);
}
break;
case FMT_SINGLE:
if (componentCount == 1) {
directory.setFloat(tagType, reader.getFloat32(tagValueOffset));
} else {
float[] floats = new float[componentCount];
for (int i = 0; i < componentCount; i++)
floats[i] = reader.getFloat32(tagValueOffset + (i * 4));
directory.setFloatArray(tagType, floats);
}
break;
case FMT_DOUBLE:
if (componentCount == 1) {
directory.setDouble(tagType, reader.getDouble64(tagValueOffset));
} else {
double[] doubles = new double[componentCount];
for (int i = 0; i < componentCount; i++)
doubles[i] = reader.getDouble64(tagValueOffset + (i * 4));
directory.setDoubleArray(tagType, doubles);
}
break;
//
// Note that all integral types are stored as int32 internally (the largest supported by TIFF)
//
case FMT_SBYTE:
if (componentCount == 1) {
directory.setInt(tagType, reader.getInt8(tagValueOffset));
} else {
int[] bytes = new int[componentCount];
for (int i = 0; i < componentCount; i++)
bytes[i] = reader.getInt8(tagValueOffset + i);
directory.setIntArray(tagType, bytes);
}
break;
case FMT_BYTE:
if (componentCount == 1) {
directory.setInt(tagType, reader.getUInt8(tagValueOffset));
} else {
int[] bytes = new int[componentCount];
for (int i = 0; i < componentCount; i++)
bytes[i] = reader.getUInt8(tagValueOffset + i);
directory.setIntArray(tagType, bytes);
}
break;
case FMT_USHORT:
if (componentCount == 1) {
int i = reader.getUInt16(tagValueOffset);
directory.setInt(tagType, i);
} else {
int[] ints = new int[componentCount];
for (int i = 0; i < componentCount; i++)
ints[i] = reader.getUInt16(tagValueOffset + (i * 2));
directory.setIntArray(tagType, ints);
}
break;
case FMT_SSHORT:
if (componentCount == 1) {
int i = reader.getInt16(tagValueOffset);
directory.setInt(tagType, i);
} else {
int[] ints = new int[componentCount];
for (int i = 0; i < componentCount; i++)
ints[i] = reader.getInt16(tagValueOffset + (i * 2));
directory.setIntArray(tagType, ints);
}
break;
case FMT_SLONG:
case FMT_ULONG:
// NOTE 'long' in this case means 32 bit, not 64
if (componentCount == 1) {
int i = reader.getInt32(tagValueOffset);
directory.setInt(tagType, i);
} else {
int[] ints = new int[componentCount];
for (int i = 0; i < componentCount; i++)
ints[i] = reader.getInt32(tagValueOffset + (i * 4));
directory.setIntArray(tagType, ints);
}
break;
default:
directory.addError("Unknown format code " + formatCode + " for tag " + tagType);
}
}
/**
* Determine the offset at which a given InteropArray entry begins within the specified IFD.
*
* @param dirStartOffset the offset at which the IFD starts
* @param entryNumber the zero-based entry number
*/
private int calculateTagOffset(int dirStartOffset, int entryNumber)
{
// add 2 bytes for the tag count
// each entry is 12 bytes, so we skip 12 * the number seen so far
return dirStartOffset + 2 + (12 * entryNumber);
}
}