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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.tools;
import com.drew.imaging.jpeg.JpegProcessingException;
import com.drew.imaging.jpeg.JpegSegmentData;
import com.drew.imaging.jpeg.JpegSegmentReader;
import com.drew.imaging.jpeg.JpegSegmentType;
import com.drew.lang.Iterables;
import com.drew.lang.annotations.NotNull;
import java.io.File;
import java.io.IOException;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
/**
* Extracts JPEG segments and writes them to individual files.
* <p>
* Extracting only the required segment(s) for use in unit testing has several benefits:
* <ul>
* <li>Helps reduce the repository size. For example a small JPEG image may still be 20kB+ in size, yet its
* APPD (IPTC) segment may be as small as 200 bytes.</li>
* <li>Makes unit tests run more rapidly.</li>
* <li>Partially anonymises user-contributed data by removing image portions.</li>
* </ul>
*
* @author Drew Noakes https://drewnoakes.com
*/
public class ExtractJpegSegmentTool
{
public static void main(String[] args) throws IOException, JpegProcessingException
{
if (args.length < 1) {
printUsage();
System.exit(1);
}
String filePath = args[0];
if (!new File(filePath).exists()) {
System.err.println("File does not exist");
printUsage();
System.exit(1);
}
Set<JpegSegmentType> segmentTypes = new HashSet<JpegSegmentType>();
for (int i = 1; i < args.length; i++) {
JpegSegmentType segmentType = JpegSegmentType.valueOf(args[i].toUpperCase());
if (!segmentType.canContainMetadata) {
System.err.printf("WARNING: Segment type %s cannot contain metadata so it may not be necessary to extract it%n", segmentType);
}
segmentTypes.add(segmentType);
}
if (segmentTypes.size() == 0) {
// If none specified, use all that could reasonably contain metadata
segmentTypes.addAll(JpegSegmentType.canContainMetadataTypes);
}
System.out.println("Reading: " + filePath);
JpegSegmentData segmentData = JpegSegmentReader.readSegments(new File(filePath), segmentTypes);
saveSegmentFiles(filePath, segmentData);
}
public static void saveSegmentFiles(@NotNull String jpegFilePath, @NotNull JpegSegmentData segmentData) throws IOException
{
for (JpegSegmentType segmentType : segmentData.getSegmentTypes()) {
List<byte[]> segments = Iterables.toList(segmentData.getSegments(segmentType));
if (segments.size() == 0) {
continue;
}
if (segments.size() > 1) {
for (int i = 0; i < segments.size(); i++) {
String outputFilePath = String.format("%s.%s.%d", jpegFilePath, segmentType.toString().toLowerCase(), i);
System.out.println("Writing: " + outputFilePath);
FileUtil.saveBytes(new File(outputFilePath), segments.get(i));
}
} else {
String outputFilePath = String.format("%s.%s", jpegFilePath, segmentType.toString().toLowerCase());
System.out.println("Writing: " + outputFilePath);
FileUtil.saveBytes(new File(outputFilePath), segments.get(0));
}
}
}
private static void printUsage()
{
System.out.println("USAGE:\n");
System.out.println("\tjava com.drew.tools.ExtractJpegSegmentTool <filename> [<segment> ...]\n");
System.out.print("Where <segment> is zero or more of:");
for (JpegSegmentType segmentType : JpegSegmentType.class.getEnumConstants()) {
if (segmentType.canContainMetadata) {
System.out.print(" " + segmentType.toString());
}
}
System.out.println();
}
}
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