Method readData

src/main/java/com/jmatio/io/MatFileReader.java:758–837

Reads data form byte buffer. Searches for either miCOMPRESSED data or miMATRIX data. Compressed data are inflated and the product is recursively passed back to this same method. Modifies buf position. @param buf - input byte buffer @throws IOExcep

(ByteBuffer buf)

	 * @throws IOException when error occurs while reading the buffer.
	 */
	void readData(ByteBuffer buf) throws IOException {
		//read data
		ISMatTag tag = new ISMatTag(buf);
		switch (tag.type) {
		case MatDataTypes.miCOMPRESSED:
			int numOfBytes = tag.size;
			//inflate and recur
			if (buf.remaining() < numOfBytes) {
				throw new MatlabIOException("Compressed buffer length miscalculated!");
			}
			//instead of standard Inlater class instance I use an inflater input
			//stream... gives a great boost to the performance
			InflaterInputStream iis = new InflaterInputStream(new ByteBufferInputStream(buf, numOfBytes));

			//process data decompression
			byte[] result = new byte[1024];

			HeapBufferDataOutputStream dos = new HeapBufferDataOutputStream();
			int i;
			try {
				do {
					i = iis.read(result, 0, result.length);
					int len = Math.max(0, i);
					dos.write(result, 0, len);
				} while (i > 0);
			} catch (EOFException eofe) {
				System.out.println("EOFException detected!");
			} catch (IOException e) {
				throw new MatlabIOException("Could not decompress data: " + e);
			} finally {
				iis.close();
				dos.flush();
			}
			//create a ByteBuffer from the deflated data
			ByteBuffer out = dos.getByteBuffer();

			//with proper byte ordering
			out.order(matFileHeader.getByteOrder());

			try {
				readData(out);
			} catch (IOException e) {
				throw e;
			} finally {
				dos.close();
			}
			break;
		case MatDataTypes.miMATRIX:
			//read in the matrix
			int pos = buf.position();

			MLArray element = readMatrix(buf, true);
			if (element != null) {
				// Sometimes a MAT file will contain more than one unnamed
				// element.  This ensures that all of them will be accessible
				// in the end result.
				if (!data.containsKey(element.getName())) {
					data.put(element.getName(), element);