public IIOMetadata getStreamMetadata(int imageIndex) throws IIOException {
readHeader();
TIFFStreamMetadata sm = new TIFFStreamMetadata();
Node root = sm.getAsTree(TIFFStreamMetadata.nativeMetadataFormatName);
sm.setFromTree(TIFFStreamMetadata.nativeMetadataFormatName, root);
return sm;
}
// Do not seek to the beginning of the stream so as to allow users to
// point us at an IFD within some other file format
private void readHeader() throws IIOException {
if (gotHeader) {
return;
}
if (stream == null) {
throw new IllegalStateException("Input not set!");
}
// Create an object to store the stream metadata
this.streamMetadata = new TIFFStreamMetadata();
try {
int byteOrder = stream.readUnsignedShort();
if (byteOrder == 0x4d4d) {
streamMetadata.byteOrder = ByteOrder.BIG_ENDIAN;
stream.setByteOrder(ByteOrder.BIG_ENDIAN);
} else if (byteOrder == 0x4949) {
streamMetadata.byteOrder = ByteOrder.LITTLE_ENDIAN;
stream.setByteOrder(ByteOrder.LITTLE_ENDIAN);
} else {
processWarningOccurred("Bad byte order in header, assuming little-endian");
streamMetadata.byteOrder = ByteOrder.LITTLE_ENDIAN;
stream.setByteOrder(ByteOrder.LITTLE_ENDIAN);
}
int magic = stream.readUnsignedShort();
if (magic != 42) {
processWarningOccurred("Bad magic number in header, continuing");
}
// Seek to start of first IFD
long offset = stream.readUnsignedInt();
imageStartPosition.add(new Long(offset));
stream.seek(offset);
} catch (IOException e) {
throw new IIOException("I/O error reading header!", e);
}
gotHeader = true;
}
