Java – convert small endian files to large endian files

How to convert a liitle endian binary file into a large endian binary file I have a binary file written in C. I read this file with datainputstream in Java and read it into greater India format I've also seen the ByteBuffer class, but I don't know how to use it to get the results I want Please help.

Thank you.

Solution

Open NiO filechannel:

FileInputStream fs = new FileInputStream("myfile.bin");
FileChannel fc = fs.getChannel();

Set ByteBuffer endianness (used by [get put]) int(), [get put] long(), [get put] short(), [get put] double()

ByteBuffer buf = ByteBuffer.allocate(0x10000);
buf.order(ByteOrder.LITTLE_ENDIAN); // or ByteOrder.BIG_ENDIAN

Read ByteBuffer from filechannel

fc.read(buf);
buf.flip();
// here you take data from the buffer by either of getShort(),getInt(),getLong(),getDouble(),or get(byte[],offset,len)
buf.compact();

To correctly handle the byte order of input, you need to know exactly what is stored in the file and in what order (so-called protocol or format)