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Commit aebe2347 authored by Sungsoo's avatar Sungsoo Committed by Sungsoo Lim
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DO NOT MERGE) ExifInterface: Make saveAttributes throw an exception before change 

ExifInterface object can be created with a unsupported file format.
If saveAttribute is called with an unsupported file format, ExifInterface
makes the file corrupted. This CL prevents those cases by throwing
an exception before making any change on the file.

Bug: 30936376
Change-Id: I915f56b00ec9422b53591ac5534e070a1d6798e6
parent 7ec85f9d

media/java/android/media/ExifInterface.java

+7 −0
Original line number Diff line number Diff line
@@ -1034,6 +1034,7 @@ public class ExifInterface { 
    private int mThumbnailOffset;

    private int mThumbnailLength;

    private byte[] mThumbnailBytes;

    private boolean mIsSupportedFile;



    // Pattern to check non zero timestamp

    private static final Pattern sNonZeroTimePattern = Pattern.compile(".*[1-9].*");
@@ -1332,9 +1333,11 @@ public class ExifInterface { 
        try {

            InputStream in = new FileInputStream(mFilename);

            getJpegAttributes(in);

            mIsSupportedFile = true;

        } catch (IOException e) {

            // Ignore exceptions in order to keep the compatibility with the old versions of

            // ExifInterface.

            mIsSupportedFile = false;

            Log.w(TAG, "Invalid image.", e);

        } finally {

            addDefaultValuesForCompatibility();
@@ -1363,6 +1366,10 @@ public class ExifInterface { 
     * and make a single call rather than multiple calls for each attribute.

     */

    public void saveAttributes() throws IOException {

        if (!mIsSupportedFile) {

            throw new UnsupportedOperationException(

                    "ExifInterface only supports saving attributes on JPEG formats.");

        }

        // Keep the thumbnail in memory

        mThumbnailBytes = getThumbnail();