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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.io.IOException;
import java.io.InputStream;
/**
* This class reads the EXIF header of a JPEG file and stores it in {@link ExifData}.
*/
public class ExifReader {
/**
* Parses the inputStream and and returns the EXIF data in an {@link ExifData}.
* @throws ExifInvalidFormatException
* @throws IOException
*/
public ExifData read(InputStream inputStream) throws ExifInvalidFormatException,
IOException {
ExifParser parser = ExifParser.parse(inputStream);
ExifData exifData = new ExifData(parser.getByteOrder());
int event = parser.next();
while (event != ExifParser.EVENT_END) {
switch (event) {
case ExifParser.EVENT_START_OF_IFD:
exifData.addIfdData(new IfdData(parser.getCurrentIfd()));
break;
case ExifParser.EVENT_NEW_TAG:
ExifTag tag = parser.getTag();
if (!tag.hasValue()) {
parser.registerForTagValue(tag);
} else {
exifData.getIfdData(tag.getIfd()).setTag(tag);
}
break;
case ExifParser.EVENT_VALUE_OF_REGISTERED_TAG:
tag = parser.getTag();
if (tag.getDataType() == ExifTag.TYPE_UNDEFINED) {
byte[] buf = new byte[tag.getComponentCount()];
parser.read(buf);
tag.setValue(buf);
}
exifData.getIfdData(tag.getIfd()).setTag(tag);
break;
case ExifParser.EVENT_COMPRESSED_IMAGE:
byte buf[] = new byte[parser.getCompressedImageSize()];
parser.read(buf);
exifData.setCompressedThumbnail(buf);
break;
case ExifParser.EVENT_UNCOMPRESSED_STRIP:
buf = new byte[parser.getStripSize()];
parser.read(buf);
exifData.setStripBytes(parser.getStripIndex(), buf);
break;
}
event = parser.next();
}
return exifData;
}
}
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