diff options
Diffstat (limited to 'wallpaper_picker_src/com/android/gallery3d/exif/ExifReader.java')
-rw-r--r-- | wallpaper_picker_src/com/android/gallery3d/exif/ExifReader.java | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/wallpaper_picker_src/com/android/gallery3d/exif/ExifReader.java b/wallpaper_picker_src/com/android/gallery3d/exif/ExifReader.java new file mode 100644 index 000000000..68e972fb7 --- /dev/null +++ b/wallpaper_picker_src/com/android/gallery3d/exif/ExifReader.java @@ -0,0 +1,92 @@ +/* + * 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 android.util.Log; + +import java.io.IOException; +import java.io.InputStream; + +/** + * This class reads the EXIF header of a JPEG file and stores it in + * {@link ExifData}. + */ +class ExifReader { + private static final String TAG = "ExifReader"; + + private final ExifInterface mInterface; + + ExifReader(ExifInterface iRef) { + mInterface = iRef; + } + + /** + * Parses the inputStream and and returns the EXIF data in an + * {@link ExifData}. + * + * @throws ExifInvalidFormatException + * @throws IOException + */ + protected ExifData read(InputStream inputStream) throws ExifInvalidFormatException, + IOException { + ExifParser parser = ExifParser.parse(inputStream, mInterface); + ExifData exifData = new ExifData(parser.getByteOrder()); + ExifTag tag = null; + + 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: + 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) { + parser.readFullTagValue(tag); + } + exifData.getIfdData(tag.getIfd()).setTag(tag); + break; + case ExifParser.EVENT_COMPRESSED_IMAGE: + byte buf[] = new byte[parser.getCompressedImageSize()]; + if (buf.length == parser.read(buf)) { + exifData.setCompressedThumbnail(buf); + } else { + Log.w(TAG, "Failed to read the compressed thumbnail"); + } + break; + case ExifParser.EVENT_UNCOMPRESSED_STRIP: + buf = new byte[parser.getStripSize()]; + if (buf.length == parser.read(buf)) { + exifData.setStripBytes(parser.getStripIndex(), buf); + } else { + Log.w(TAG, "Failed to read the strip bytes"); + } + break; + } + event = parser.next(); + } + return exifData; + } +} |