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package com.bumptech.glide.gifdecoder;
import com.bumptech.glide.gifdecoder.test.GifBytesTestUtil;
import org.junit.Before;
import org.junit.Test;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertNull;
/**
* Tests for {@link com.bumptech.glide.gifdecoder.GifHeaderParser}.
*/
public class GifHeaderParserTest {
private GifHeaderParser parser;
@Before
public void setUp() {
parser = new GifHeaderParser();
}
@Test
public void testReturnsHeaderWithFormatErrorIfDoesNotStartWithGifHeader() {
parser.setData("wrong_header".getBytes());
GifHeader result = parser.parseHeader();
assertEquals(GifDecoder.STATUS_FORMAT_ERROR, result.status);
}
@Test
public void testCanReadValidHeaderAndLSD() {
final int width = 10;
final int height = 20;
ByteBuffer buffer = ByteBuffer.allocate(GifBytesTestUtil.HEADER_LENGTH).order(ByteOrder.LITTLE_ENDIAN);
GifBytesTestUtil.writeHeaderAndLsd(buffer, width, height, false, 0);
parser.setData(buffer.array());
GifHeader header = parser.parseHeader();
assertEquals(width, header.width);
assertEquals(height, header.height);
assertFalse(header.gctFlag);
// 2^(1+0) == 2^1 == 2.
assertEquals(2, header.gctSize);
assertEquals(0, header.bgIndex);
assertEquals(0, header.pixelAspect);
}
@Test
public void testCanParseHeaderOfTestImageWithoutGraphicalExtension() throws IOException {
byte[] data = readResourceData("gif_without_graphical_control_extension.gif");
parser.setData(data);
GifHeader header = parser.parseHeader();
assertEquals(1, header.frameCount);
assertNotNull(header.frames.get(0));
assertEquals(GifDecoder.STATUS_OK, header.status);
}
@Test
public void testCanReadImageDescriptorWithoutGraphicalExtension() {
final int lzwMinCodeSize = 2;
ByteBuffer buffer = ByteBuffer.allocate(
GifBytesTestUtil.HEADER_LENGTH
+ GifBytesTestUtil.IMAGE_DESCRIPTOR_LENGTH
+ GifBytesTestUtil.getImageDataSize(lzwMinCodeSize)
).order(ByteOrder.LITTLE_ENDIAN);
GifBytesTestUtil.writeHeaderAndLsd(buffer, 1, 1, false, 0);
GifBytesTestUtil.writeImageDescriptor(buffer, 0, 0, 1, 1, false /*hasLct*/, 0);
GifBytesTestUtil.writeFakeImageData(buffer, lzwMinCodeSize);
parser.setData(buffer.array());
GifHeader header = parser.parseHeader();
assertEquals(1, header.width);
assertEquals(1, header.height);
assertEquals(1, header.frameCount);
assertNotNull(header.frames.get(0));
}
@Test
public void testSetsFrameLocalColorTableToNullIfNoColorTable() {
final int lzwMinCodeSize = 2;
ByteBuffer buffer = ByteBuffer.allocate(
GifBytesTestUtil.HEADER_LENGTH
+ GifBytesTestUtil.IMAGE_DESCRIPTOR_LENGTH
+ GifBytesTestUtil.getImageDataSize(lzwMinCodeSize)
).order(ByteOrder.LITTLE_ENDIAN);
GifBytesTestUtil.writeHeaderAndLsd(buffer, 1, 1, false, 0);
GifBytesTestUtil.writeImageDescriptor(buffer, 0, 0, 1, 1, false /*hasLct*/, 0);
GifBytesTestUtil.writeFakeImageData(buffer, lzwMinCodeSize);
parser.setData(buffer.array());
GifHeader header = parser.parseHeader();
assertEquals(1, header.width);
assertEquals(1, header.height);
assertEquals(1, header.frameCount);
assertNotNull(header.frames.get(0));
assertNull(header.frames.get(0).lct);
}
@Test
public void testSetsFrameLocalColorTableIfHasColorTable() {
final int lzwMinCodeSize = 2;
final int numColors = 4;
ByteBuffer buffer = ByteBuffer.allocate(
GifBytesTestUtil.HEADER_LENGTH
+ GifBytesTestUtil.IMAGE_DESCRIPTOR_LENGTH
+ GifBytesTestUtil.getImageDataSize(lzwMinCodeSize)
+ GifBytesTestUtil.getColorTableLength(numColors)
).order(ByteOrder.LITTLE_ENDIAN);
GifBytesTestUtil.writeHeaderAndLsd(buffer, 1, 1, false, 0);
GifBytesTestUtil.writeImageDescriptor(buffer, 0, 0, 1, 1, true /*hasLct*/, numColors);
GifBytesTestUtil.writeColorTable(buffer, numColors);
GifBytesTestUtil.writeFakeImageData(buffer, 2);
parser.setData(buffer.array());
GifHeader header = parser.parseHeader();
assertEquals(1, header.width);
assertEquals(1, header.height);
assertEquals(1, header.frameCount);
assertNotNull(header.frames.get(0));
GifFrame frame = header.frames.get(0);
assertNotNull(frame.lct);
}
@Test
public void testCanParseMultipleFrames() {
final int lzwMinCodeSize = 2;
final int expectedFrames = 3;
final int frameSize = GifBytesTestUtil.IMAGE_DESCRIPTOR_LENGTH
+ GifBytesTestUtil.getImageDataSize(lzwMinCodeSize);
ByteBuffer buffer = ByteBuffer.allocate(
GifBytesTestUtil.HEADER_LENGTH + expectedFrames * frameSize
).order(ByteOrder.LITTLE_ENDIAN);
GifBytesTestUtil.writeHeaderAndLsd(buffer, 1, 1, false, 0);
for (int i = 0; i < expectedFrames; i++) {
GifBytesTestUtil.writeImageDescriptor(buffer, 0, 0, 1, 1, false /*hasLct*/, 0 /*numColors*/);
GifBytesTestUtil.writeFakeImageData(buffer, 2);
}
parser.setData(buffer.array());
GifHeader header = parser.parseHeader();
assertEquals(expectedFrames, header.frameCount);
assertEquals(expectedFrames, header.frames.size());
}
private InputStream openResource(String imageName) throws IOException {
return getClass().getResourceAsStream("/" + imageName);
}
private byte[] readResourceData(String imageName) {
ByteArrayOutputStream os = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
InputStream is = null;
try {
is = openResource(imageName);
int read;
while ((read = is.read(buffer)) != -1) {
os.write(buffer, 0, read);
}
} catch (IOException e) {
throw new RuntimeException(e);
} finally {
if (is != null) {
try {
is.close();
} catch (IOException e) {
// Ignore.
}
}
}
return os.toByteArray();
}
}
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