public TIFFNode getExifMetadata() throws IOException {
readHeader();
return er.getMetaDataTree();
}
/** Reads the header. Does nothing if the header has already been loaded. */
private void readHeader() throws IOException {
if (numImages == -1) {
ImageInputStream in = (ImageInputStream) getInput();
in.seek(0);
er = new EXIFReader(in);
er.setFirstImageOnly(false);
er.read();
// Get some information that is easy to obtain through a map
{
HashMap<TIFFTag, TIFFField> m = er.getMetaDataMap();
TIFFField mde;
if ((mde = m.get(MPFTagSet.get(MPFTagSet.TAG_NumberOfImages))) != null) {
numImages = ((Number) mde.getData()).intValue();
} else {
numImages = 1;
}
if ((mde = m.get(EXIFTagSet.PixelXDimension)) != null) {
width = ((Number) mde.getData()).intValue();
}
if ((mde = m.get(EXIFTagSet.PixelYDimension)) != null) {
height = ((Number) mde.getData()).intValue();
}
}
imageOffsets = new long[numImages];
imageLengths = new long[numImages];
if (numImages == 1) {
imageOffsets[0] = 0;
imageLengths[0] = in.length();
}
// Get now at the tough part
int index = 0;
for (Iterator<TIFFNode> e = er.getMetaDataTree().preorderIterator(); e.hasNext(); ) {
TIFFNode n = e.next();
if (n instanceof TIFFDirectory) {
TIFFDirectory dir = (TIFFDirectory) n;
// System.out.println("dir:" + dir.getName());
if (dir.getName() != null && dir.getName().equals("MPEntry")) {
long dirOffset = dir.getFileSegments().get(0).getOffset();
TIFFField offsetField = dir.getField(MPEntryTagSet.IndividualImageDataOffset);
TIFFField lengthField = dir.getField(MPEntryTagSet.IndividualImageSize);
if (offsetField != null && lengthField != null) {
long dataOffset = (Long) offsetField.getData();
imageOffsets[index] = dataOffset == 0 ? 0 : dirOffset + dataOffset;
imageLengths[index] = (Long) lengthField.getData();
index++;
}
}
}
}
// Store metadata for later access
String formatName = "com_sun_media_imageio_plugins_tiff_image_1.0";
imageMetadata = new IIOMetadata[numImages];
for (int i = 0; i < numImages; i++) {
imageMetadata[i] = new DefaultIIOMetadata(formatName, er.getIIOMetadataTree(formatName, i));
}
in.seek(0);
}
}