public byte[] readDataBlock(int dataBlockIndex) throws IOException {
		return provider.readBytes(blockPointerTable.get(dataBlockIndex),
			compressedBlockSizes.get(dataBlockIndex));
	}
Reads one block from the data pointed to by the CramfsInode.
@param dataBlockIndex the index of the block to read.
@return a byte array representing the compressed data for a compressed block.
@throws IOException if error occurs when reading the data block.
Ghidra/Features/FileFormats/src/main/java/ghidra/file/formats/cramfs/CramFsBlockReader.java