Package com.drew.imaging.jpeg

Examples of com.drew.imaging.jpeg.JpegSegmentReader.readSegment()

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            JpegSegmentReader segmentReader;
            try {
                segmentReader = new JpegSegmentReader(new ByteArrayInputStream(b));

                final byte[] exifSegment = segmentReader.readSegment(JpegSegmentReader.SEGMENT_APP1);
                final byte[] iptcSegment = segmentReader.readSegment(JpegSegmentReader.SEGMENT_APPD);
                final Metadata metadata = new Metadata();
                new ExifReader(exifSegment).extract(metadata);
                new IptcReader(iptcSegment).extract(metadata);
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            JpegSegmentReader segmentReader;
            try {
                segmentReader = new JpegSegmentReader(new ByteArrayInputStream(b));

                final byte[] exifSegment = segmentReader.readSegment(JpegSegmentReader.SEGMENT_APP1);
                final byte[] iptcSegment = segmentReader.readSegment(JpegSegmentReader.SEGMENT_APPD);
                final Metadata metadata = new Metadata();
                new ExifReader(exifSegment).extract(metadata);
                new IptcReader(iptcSegment).extract(metadata);

                @SuppressWarnings("unchecked")
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        // Approach 3
        // As fast as approach 1 (this is what goes on inside the JpegMetadataReader's readMetadata() method), this code
        // is handy if you want to look into other Jpeg segments as well.
        try {
            JpegSegmentReader segmentReader = new JpegSegmentReader(file);
            byte[] exifSegment = segmentReader.readSegment(JpegSegmentReader.SEGMENT_APP1);
            byte[] iptcSegment = segmentReader.readSegment(JpegSegmentReader.SEGMENT_APPD);
            Metadata metadata = new Metadata();
            if (exifSegment != null)
                new ExifReader().extract(new ByteArrayReader(exifSegment), metadata);
            if (iptcSegment != null)
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        // As fast as approach 1 (this is what goes on inside the JpegMetadataReader's readMetadata() method), this code
        // is handy if you want to look into other Jpeg segments as well.
        try {
            JpegSegmentReader segmentReader = new JpegSegmentReader(file);
            byte[] exifSegment = segmentReader.readSegment(JpegSegmentReader.SEGMENT_APP1);
            byte[] iptcSegment = segmentReader.readSegment(JpegSegmentReader.SEGMENT_APPD);
            Metadata metadata = new Metadata();
            if (exifSegment != null)
                new ExifReader().extract(new ByteArrayReader(exifSegment), metadata);
            if (iptcSegment != null)
                new IptcReader().extract(new ByteArrayReader(iptcSegment), metadata);
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    public void testReadApp1Segment() throws Exception
    {
        File jpeg = new File("Source/com/drew/metadata/exif/test/withExif.jpg");
        JpegSegmentReader segmentReader = new JpegSegmentReader(jpeg);
        byte[] exifData = segmentReader.readSegment(JpegSegmentReader.SEGMENT_APP1);
        assertTrue("exif data too short", exifData.length > 4);
        assertEquals("Exif", new String(exifData, 0, 4));
    }

    public void testReadDQTSegment() throws Exception
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    public void testReadDQTSegment() throws Exception
    {
        File jpeg = new File("Source/com/drew/metadata/exif/test/withExif.jpg");
        JpegSegmentReader segmentReader = new JpegSegmentReader(jpeg);
        byte[] quantizationTableData = segmentReader.readSegment(JpegSegmentReader.SEGMENT_DQT);
        assertTrue("shouldn't have zero length quantizationTableData", quantizationTableData.length > 0);
        assertTrue("quantizationTableData shouldn't start with 'Exif'", !"Exif".equals(new String(quantizationTableData, 0, 4)));
    }

    public void testReadJpegByteArray() throws Exception
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            fail("Error constructing JpegSegmentReader using InputStream");
        }
        // this will never happen, as fail() is guaranteed to throw an AssertionException
        if (reader==null)
            return;
        byte[] exifData = reader.readSegment(JpegSegmentReader.SEGMENT_APP1);
        assertEquals("Exif", new String(exifData, 0, 4));
    }

    public void testReadSecondSegmentInstanace() throws Exception
    {
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    public void testReadSecondSegmentInstanace() throws Exception
    {
        File jpeg = new File("Source/com/drew/imaging/jpeg/test/withExifAndIptc.jpg");
        JpegSegmentReader reader = new JpegSegmentReader(jpeg);
        byte[] exifData0 = reader.readSegment(JpegSegmentReader.SEGMENT_APP1, 0);
        byte[] exifData1 = reader.readSegment(JpegSegmentReader.SEGMENT_APP1, 1);
        assertEquals("Exif", new String(exifData0, 0, 4));
        assertEquals("http", new String(exifData1, 0, 4));
    }
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    public void testReadSecondSegmentInstanace() throws Exception
    {
        File jpeg = new File("Source/com/drew/imaging/jpeg/test/withExifAndIptc.jpg");
        JpegSegmentReader reader = new JpegSegmentReader(jpeg);
        byte[] exifData0 = reader.readSegment(JpegSegmentReader.SEGMENT_APP1, 0);
        byte[] exifData1 = reader.readSegment(JpegSegmentReader.SEGMENT_APP1, 1);
        assertEquals("Exif", new String(exifData0, 0, 4));
        assertEquals("http", new String(exifData1, 0, 4));
    }

    public void testReadNonExistantSegmentInstance() throws Exception
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    public void testReadNonExistantSegmentInstance() throws Exception
    {
        File jpeg = new File("Source/com/drew/imaging/jpeg/test/withExifAndIptc.jpg");
        JpegSegmentReader reader = new JpegSegmentReader(jpeg);
        assertNull("third exif segment shouldn't exist", reader.readSegment(JpegSegmentReader.SEGMENT_APP1, 3));
    }

    public void testGetSegmentCount() throws Exception
    {
        File jpeg = new File("Source/com/drew/imaging/jpeg/test/withExifAndIptc.jpg");
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