convert little Endian file into big Endian

Question

how can i convert a liitle Endian binary file into big Endian binary file. i have a binary binary written in C and i am reading this file in Java with DataInputStream which

Answer 1

I recently wrote a blog post on doing exactly this. On how you can convert binary files between endianness. Adding it here for future reference for anyone coming here.

You can get this done from the following simple code

FileChannel fc = (FileChannel) Files.newByteChannel(Paths.get(filename), StandardOpenOption.READ);
ByteBuffer byteBuffer = ByteBuffer.allocate((int)fc.size());
byteBuffer.order(ByteOrder.BIG_ENDIAN);
fc.read(byteBuffer);
byteBuffer.flip();

Buffer buffer = byteBuffer.asShortBuffer();
short[] shortArray = new short[(int)fc.size()/2];
((ShortBuffer)buffer).get(shortArray);

byteBuffer.clear();
byteBuffer.order(ByteOrder.LITTLE_ENDIAN);
ShortBuffer shortOutputBuffer = byteBuffer.asShortBuffer();
shortOutputBuffer.put(shortArray);

FileChannel out = new FileOutputStream(outputfilename).getChannel();
out.write(byteBuffer);
out.close();

For detailed information about how this works you can refer to the original blog post - http://pulasthisupun.blogspot.com/2016/06/reading-and-writing-binary-files-in.html

Or the code is available at - https://github.com/pulasthi/binary-format-converter