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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.imaging.png;
import com.drew.lang.Iterables;
import com.drew.lang.StreamReader;
import org.junit.Test;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.List;
import static org.junit.Assert.assertEquals;
/**
* @author Drew Noakes https://drewnoakes.com
*/
public class PngChunkReaderTest
{
public static List<PngChunk> processFile(String filePath) throws PngProcessingException, IOException
{
FileInputStream inputStream = null;
try {
inputStream = new FileInputStream(filePath);
return Iterables.toList(new PngChunkReader().extract(new StreamReader(inputStream), null));
} finally {
if (inputStream != null) {
inputStream.close();
}
}
}
@Test
public void testExtractMspaint() throws Exception
{
List<PngChunk> chunks = processFile("Tests/Data/mspaint-8x10.png");
assertEquals(6, chunks.size());
assertEquals(PngChunkType.IHDR, chunks.get(0).getType());
assertEquals(13, chunks.get(0).getBytes().length);
assertEquals(PngChunkType.sRGB, chunks.get(1).getType());
assertEquals(1, chunks.get(1).getBytes().length);
assertEquals(PngChunkType.gAMA, chunks.get(2).getType());
assertEquals(4, chunks.get(2).getBytes().length);
assertEquals(PngChunkType.pHYs, chunks.get(3).getType());
assertEquals(9, chunks.get(3).getBytes().length);
assertEquals(PngChunkType.IDAT, chunks.get(4).getType());
assertEquals(17, chunks.get(4).getBytes().length);
assertEquals(PngChunkType.IEND, chunks.get(5).getType());
assertEquals(0, chunks.get(5).getBytes().length);
}
@Test
public void testExtractPhotoshop() throws Exception
{
List<PngChunk> chunks = processFile("Tests/Data/photoshop-8x12-rgba32.png");
assertEquals(5, chunks.size());
assertEquals(PngChunkType.IHDR, chunks.get(0).getType());
assertEquals(13, chunks.get(0).getBytes().length);
assertEquals(PngChunkType.tEXt, chunks.get(1).getType());
assertEquals(25, chunks.get(1).getBytes().length);
assertEquals(PngChunkType.iTXt, chunks.get(2).getType());
assertEquals(802, chunks.get(2).getBytes().length);
assertEquals(PngChunkType.IDAT, chunks.get(3).getType());
assertEquals(130, chunks.get(3).getBytes().length);
assertEquals(PngChunkType.IEND, chunks.get(4).getType());
assertEquals(0, chunks.get(4).getBytes().length);
}
}
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