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JPEG Exif parsing optimization.

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This commit is contained in:
Harald Kuhr 2019-08-07 15:47:33 +02:00
parent caef9b6a9e
commit d7fbd6594e
1 changed files with 7 additions and 5 deletions
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12
imageio/imageio-jpeg/src/main/java/com/twelvemonkeys/imageio/plugins/jpeg/JPEGImageReader.java
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@ -42,6 +42,7 @@ import com.twelvemonkeys.imageio.metadata.jpeg.JPEGSegmentUtil;
import com.twelvemonkeys.imageio.metadata.tiff.TIFF;
import com.twelvemonkeys.imageio.metadata.tiff.TIFFReader;
import com.twelvemonkeys.imageio.stream.BufferedImageInputStream;
import com.twelvemonkeys.imageio.stream.ByteArrayImageInputStream;
import com.twelvemonkeys.imageio.stream.SubImageInputStream;
import com.twelvemonkeys.imageio.util.ImageTypeSpecifiers;
import com.twelvemonkeys.imageio.util.ProgressListenerBase;
@ -63,8 +64,8 @@ import java.awt.color.ICC_ColorSpace;
import java.awt.color.ICC_Profile;
import java.awt.image.*;
import java.io.*;
import java.util.*;
import java.util.List;
import java.util.*;
/**
* A JPEG {@code ImageReader} implementation based on the JRE {@code JPEGImageReader},
@ -1120,14 +1121,15 @@ public final class JPEGImageReader extends ImageReaderBase {
List<Application> exifSegments = getAppSegments(JPEG.APP1, "Exif");
if (!exifSegments.isEmpty()) {
Application exif = exifSegments.get(0);
InputStream data = exif.data();
if (data.read() == -1) {
// Pad
// Identifier is "Exif\0" + 1 byte pad
int offset = exif.identifier.length() + 2;
if (exif.data.length <= offset) {
processWarningOccurred("Exif chunk has no data.");
}
else {
ImageInputStream stream = new MemoryCacheImageInputStream(data);
ImageInputStream stream = new ByteArrayImageInputStream(exif.data, offset, exif.data.length - offset);
CompoundDirectory exifMetadata = (CompoundDirectory) new TIFFReader().read(stream);
if (exifMetadata.directoryCount() == 2) {