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/*
* Copyright 2002-2017 Drew Noakes
*
* 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.
*
* More information about this project is available at:
*
* https://drewnoakes.com/code/exif/
* https://github.com/drewnoakes/metadata-extractor
*/
package com.drew.metadata.adobe;
import com.drew.imaging.jpeg.JpegSegmentMetadataReader;
import com.drew.imaging.jpeg.JpegSegmentType;
import com.drew.lang.SequentialByteArrayReader;
import com.drew.lang.SequentialReader;
import com.drew.lang.annotations.NotNull;
import com.drew.metadata.Directory;
import com.drew.metadata.Metadata;
import java.io.IOException;
import java.util.Collections;
/**
* Decodes Adobe formatted data stored in JPEG files, normally in the APPE (App14) segment.
*
* @author Philip
* @author Drew Noakes https://drewnoakes.com
*/
@SuppressWarnings("WeakerAccess")
public class AdobeJpegReader implements JpegSegmentMetadataReader
{
public static final String PREAMBLE = "Adobe";
@NotNull
public Iterable<JpegSegmentType> getSegmentTypes()
{
return Collections.singletonList(JpegSegmentType.APPE);
}
public void readJpegSegments(@NotNull Iterable<byte[]> segments, @NotNull Metadata metadata, @NotNull JpegSegmentType segmentType)
{
for (byte[] bytes : segments) {
if (bytes.length == 12 && PREAMBLE.equalsIgnoreCase(new String(bytes, 0, PREAMBLE.length())))
extract(new SequentialByteArrayReader(bytes), metadata);
}
}
public void extract(@NotNull SequentialReader reader, @NotNull Metadata metadata)
{
Directory directory = new AdobeJpegDirectory();
metadata.addDirectory(directory);
try {
reader.setMotorolaByteOrder(false);
if (!reader.getString(PREAMBLE.length()).equals(PREAMBLE)) {
directory.addError("Invalid Adobe JPEG data header.");
return;
}
directory.setInt(AdobeJpegDirectory.TAG_DCT_ENCODE_VERSION, reader.getUInt16());
directory.setInt(AdobeJpegDirectory.TAG_APP14_FLAGS0, reader.getUInt16());
directory.setInt(AdobeJpegDirectory.TAG_APP14_FLAGS1, reader.getUInt16());
directory.setInt(AdobeJpegDirectory.TAG_COLOR_TRANSFORM, reader.getInt8());
} catch (IOException ex) {
directory.addError("IO exception processing data: " + ex.getMessage());
}
}
}
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