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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.jpeg;
import com.drew.imaging.jpeg.JpegSegmentData;
import com.drew.imaging.jpeg.JpegSegmentReader;
import com.drew.imaging.jpeg.JpegSegmentType;
import com.drew.lang.SequentialByteArrayReader;
import com.drew.lang.annotations.NotNull;
import com.drew.metadata.Metadata;
import com.drew.metadata.jpeg.HuffmanTablesDirectory.HuffmanTable.HuffmanTableClass;
import org.junit.Before;
import org.junit.Test;
import java.io.File;
import java.util.Collections;
import static org.junit.Assert.*;
/**
* @author Nadahar
*/
public class JpegDhtReaderTest
{
@NotNull
public static HuffmanTablesDirectory processBytes(String filePath) throws Exception
{
Metadata metadata = new Metadata();
JpegSegmentData segmentData = JpegSegmentReader.readSegments(
new File(filePath),
Collections.singletonList(JpegSegmentType.DHT));
Iterable<byte[]> segments = segmentData.getSegments(JpegSegmentType.DHT);
for (byte[] segment : segments) {
new JpegDhtReader().extract(new SequentialByteArrayReader(segment), metadata);
}
HuffmanTablesDirectory directory = metadata.getFirstDirectoryOfType(HuffmanTablesDirectory.class);
assertNotNull(directory);
assertEquals(1, metadata.getDirectoriesOfType(HuffmanTablesDirectory.class).size());
return directory;
}
private HuffmanTablesDirectory _directory;
@Before
public void setUp() throws Exception
{
_directory = processBytes("Tests/Data/withExifAndIptc.jpg");
}
@Test
public void testExtract_NumberOfTables() throws Exception
{
assertEquals(4, _directory.getInt(HuffmanTablesDirectory.TAG_NUMBER_OF_TABLES));
assertEquals(4, _directory.getNumberOfTables());
}
@Test
public void testExtract_Tables() throws Exception
{
byte[] l = {0, 1, 4, 1, 2, 3, 3, 8, 5, 9, 6, 4, 6, 2, 3, 0};
byte[] v = {0, 1, 3, 2, 4, 5};
assertArrayEquals(l, _directory.getTable(1).getLengthBytes());
assertArrayEquals(v, _directory.getTable(2).getValueBytes());
assertEquals(HuffmanTableClass.DC, _directory.getTable(0).getTableClass());
assertEquals(HuffmanTableClass.AC, _directory.getTable(1).getTableClass());
assertEquals(HuffmanTableClass.DC, _directory.getTable(2).getTableClass());
assertEquals(HuffmanTableClass.AC, _directory.getTable(3).getTableClass());
assertEquals(0, _directory.getTable(0).getTableDestinationId());
assertEquals(0, _directory.getTable(1).getTableDestinationId());
assertEquals(1, _directory.getTable(2).getTableDestinationId());
assertEquals(1, _directory.getTable(3).getTableDestinationId());
assertEquals(25, _directory.getTable(0).getTableLength());
assertEquals(74, _directory.getTable(1).getTableLength());
assertEquals(23, _directory.getTable(2).getTableLength());
assertEquals(38, _directory.getTable(3).getTableLength());
}
}
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