tests/src/com/android/gallery3d/exif/ExifOutputStreamTest.java

/*
 * Copyright (C) 2012 The Android Open Source Project
 *
 * 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.
 */

package com.android.gallery3d.exif;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;

public class ExifOutputStreamTest extends ExifXmlDataTestCase {

    private File mTmpFile;

    @Override
    public void setUp() throws Exception {
        super.setUp();
        mTmpFile = File.createTempFile("exif_test", ".jpg");
    }

    public ExifOutputStreamTest(int imgRes, int xmlRes) {
        super(imgRes, xmlRes);
    }

    public ExifOutputStreamTest(String imgPath, String xmlPath) {
        super(imgPath, xmlPath);
    }

    public void testExifOutputStream() throws Exception {
        InputStream imageInputStream = null;
        InputStream exifInputStream = null;
        FileInputStream reDecodeInputStream = null;
        FileInputStream reParseInputStream = null;
        try {
            try {
                byte[] imgData = readToByteArray(getImageInputStream());
                imageInputStream = new ByteArrayInputStream(imgData);
                exifInputStream = new ByteArrayInputStream(imgData);

                // Read the image data
                Bitmap bmp = BitmapFactory.decodeStream(imageInputStream);
                // The image is invalid
                if (bmp == null) return;

                // Read exif data
                ExifData exifData = new ExifReader().read(exifInputStream);

                // Encode the image with the exif data
                FileOutputStream outputStream = new FileOutputStream(mTmpFile);
                ExifOutputStream exifOutputStream = new ExifOutputStream(outputStream);
                exifOutputStream.setExifData(exifData);
                bmp.compress(Bitmap.CompressFormat.JPEG, 100, exifOutputStream);
                exifOutputStream.close();

                // Re-decode the temp file and check the data.
                reDecodeInputStream = new FileInputStream(mTmpFile);
                Bitmap decodedBmp = BitmapFactory.decodeStream(reDecodeInputStream);
                assertNotNull(getImageTitle(), decodedBmp);

                // Re-parse the temp file the check EXIF tag
                reParseInputStream = new FileInputStream(mTmpFile);
                ExifData reExifData = new ExifReader().read(reParseInputStream);
                assertEquals(getImageTitle(), exifData, reExifData);
            } finally {
                Util.closeSilently(imageInputStream);
                Util.closeSilently(exifInputStream);
                Util.closeSilently(reDecodeInputStream);
                Util.closeSilently(reParseInputStream);
            }
        } catch (Exception e) {
            throw new Exception(getImageTitle(), e);
        }
    }

    private byte[] readToByteArray(InputStream is) throws IOException {
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        int len;
        byte[] buf = new byte[1024];
        while ((len = is.read(buf)) > -1) {
            bos.write(buf, 0, len);
        }
        bos.flush();
        return bos.toByteArray();
    }

    @Override
    public void tearDown() {
        mTmpFile.delete();
    }
}