| /* |
| * 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; |
| } |
| } |