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/*
* Copyright (C) 2012 The Android Open Source Project
*
* 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.
*/
package com.android.gallery3d.exif;
import java.nio.ByteOrder;
import java.util.ArrayList;
import java.util.Arrays;
/**
* This class stores the EXIF header in IFDs according to the JPEG specification.
* It is the result produced by {@link ExifReader}.
* @see ExifReader
* @see IfdData
*/
public class ExifData {
private final IfdData[] mIfdDatas = new IfdData[IfdId.TYPE_IFD_COUNT];
private byte[] mThumbnail;
private ArrayList<byte[]> mStripBytes = new ArrayList<byte[]>();
private final ByteOrder mByteOrder;
public ExifData(ByteOrder order) {
mByteOrder = order;
}
/**
* Gets the IFD data of the specified IFD.
*
* @see IfdId#TYPE_IFD_0
* @see IfdId#TYPE_IFD_1
* @see IfdId#TYPE_IFD_EXIF
* @see IfdId#TYPE_IFD_GPS
* @see IfdId#TYPE_IFD_INTEROPERABILITY
*/
public IfdData getIfdData(int ifdId) {
return mIfdDatas[ifdId];
}
/**
* Adds IFD data. If IFD data of the same type already exists,
* it will be replaced by the new data.
*/
public void addIfdData(IfdData data) {
mIfdDatas[data.getId()] = data;
}
/**
* Gets the compressed thumbnail. Returns null if there is no compressed thumbnail.
*
* @see #hasCompressedThumbnail()
*/
public byte[] getCompressedThumbnail() {
return mThumbnail;
}
/**
* Sets the compressed thumbnail.
*/
public void setCompressedThumbnail(byte[] thumbnail) {
mThumbnail = thumbnail;
}
/**
* Returns true it this header contains a compressed thumbnail.
*/
public boolean hasCompressedThumbnail() {
return mThumbnail != null;
}
/**
* Adds an uncompressed strip.
*/
public void setStripBytes(int index, byte[] strip) {
if (index < mStripBytes.size()) {
mStripBytes.set(index, strip);
} else {
for (int i = mStripBytes.size(); i < index; i++) {
mStripBytes.add(null);
}
mStripBytes.add(strip);
}
}
/**
* Gets the strip count
*/
public int getStripCount() {
return mStripBytes.size();
}
/**
* Gets the strip at the specified index.
* @exceptions #IndexOutOfBoundException
*/
public byte[] getStrip(int index) {
return mStripBytes.get(index);
}
/**
* Gets the byte order.
*/
public ByteOrder getByteOrder() {
return mByteOrder;
}
/**
* Returns true if this header contains compressed strip of thumbnail.
*/
public boolean hasUncompressedStrip() {
return mStripBytes.size() != 0;
}
@Override
public boolean equals(Object obj) {
if (obj instanceof ExifData) {
ExifData data = (ExifData) obj;
if (data.mByteOrder != mByteOrder
|| !Arrays.equals(data.mThumbnail, mThumbnail)
|| data.mStripBytes.size() != mStripBytes.size()) return false;
for (int i = 0; i < mStripBytes.size(); i++) {
if (!Arrays.equals(data.mStripBytes.get(i), mStripBytes.get(i))) return false;
}
for (int i = 0; i < IfdId.TYPE_IFD_COUNT; i++) {
if (!Util.equals(data.getIfdData(i), getIfdData(i))) return false;
}
return true;
}
return false;
}
public void addGpsTags(double latitude, double longitude) {
IfdData gpsIfd = getIfdData(IfdId.TYPE_IFD_GPS);
if (gpsIfd == null) {
gpsIfd = new IfdData(IfdId.TYPE_IFD_GPS);
addIfdData(gpsIfd);
}
ExifTag latTag = new ExifTag(ExifTag.GPS_TAG.TAG_GPS_LATITUDE, ExifTag.TYPE_RATIONAL,
3, IfdId.TYPE_IFD_GPS);
ExifTag longTag = new ExifTag(ExifTag.GPS_TAG.TAG_GPS_LONGITUDE, ExifTag.TYPE_RATIONAL,
3, IfdId.TYPE_IFD_GPS);
ExifTag latRefTag = new ExifTag(ExifTag.GPS_TAG.TAG_GPS_LATITUDE_REF,
ExifTag.TYPE_ASCII, 2, IfdId.TYPE_IFD_GPS);
ExifTag longRefTag = new ExifTag(ExifTag.GPS_TAG.TAG_GPS_LONGITUDE_REF,
ExifTag.TYPE_ASCII, 2, IfdId.TYPE_IFD_GPS);
latTag.setValue(toExifLatLong(latitude));
longTag.setValue(toExifLatLong(longitude));
latRefTag.setValue(latitude >= 0 ? "N" : "S");
longRefTag.setValue(longitude >= 0 ? "E" : "W");
gpsIfd.setTag(latTag);
gpsIfd.setTag(longTag);
gpsIfd.setTag(latRefTag);
gpsIfd.setTag(longRefTag);
}
private static Rational[] toExifLatLong(double value) {
// convert to the format dd/1 mm/1 ssss/100
value = Math.abs(value);
int degrees = (int) value;
value = (value - degrees) * 60;
int minutes = (int) value;
value = (value - minutes) * 6000;
int seconds = (int) value;
return new Rational[] {
new Rational(degrees, 1), new Rational(minutes, 1), new Rational(seconds, 100)};
}
}
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