Michael Jurka
93 lines
3.3 KiB
Java
93 lines
3.3 KiB
Java
/*
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* Copyright (C) 2012 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.gallery3d.exif;
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import android.util.Log;
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import java.io.IOException;
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import java.io.InputStream;
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/**
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* This class reads the EXIF header of a JPEG file and stores it in
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* {@link ExifData}.
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*/
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class ExifReader {
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private static final String TAG = "ExifReader";
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private final ExifInterface mInterface;
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ExifReader(ExifInterface iRef) {
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mInterface = iRef;
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}
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/**
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* Parses the inputStream and and returns the EXIF data in an
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* {@link ExifData}.
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*
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* @throws ExifInvalidFormatException
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* @throws IOException
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*/
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protected ExifData read(InputStream inputStream) throws ExifInvalidFormatException,
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IOException {
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ExifParser parser = ExifParser.parse(inputStream, mInterface);
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ExifData exifData = new ExifData(parser.getByteOrder());
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ExifTag tag = null;
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int event = parser.next();
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while (event != ExifParser.EVENT_END) {
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switch (event) {
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case ExifParser.EVENT_START_OF_IFD:
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exifData.addIfdData(new IfdData(parser.getCurrentIfd()));
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break;
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case ExifParser.EVENT_NEW_TAG:
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tag = parser.getTag();
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if (!tag.hasValue()) {
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parser.registerForTagValue(tag);
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} else {
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exifData.getIfdData(tag.getIfd()).setTag(tag);
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}
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break;
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case ExifParser.EVENT_VALUE_OF_REGISTERED_TAG:
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tag = parser.getTag();
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if (tag.getDataType() == ExifTag.TYPE_UNDEFINED) {
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parser.readFullTagValue(tag);
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}
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exifData.getIfdData(tag.getIfd()).setTag(tag);
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break;
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case ExifParser.EVENT_COMPRESSED_IMAGE:
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byte buf[] = new byte[parser.getCompressedImageSize()];
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if (buf.length == parser.read(buf)) {
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exifData.setCompressedThumbnail(buf);
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} else {
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Log.w(TAG, "Failed to read the compressed thumbnail");
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}
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break;
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case ExifParser.EVENT_UNCOMPRESSED_STRIP:
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buf = new byte[parser.getStripSize()];
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if (buf.length == parser.read(buf)) {
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exifData.setStripBytes(parser.getStripIndex(), buf);
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} else {
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Log.w(TAG, "Failed to read the strip bytes");
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}
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break;
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}
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event = parser.next();
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}
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return exifData;
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}
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}
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