Changing endian format

[Amit Gaur]

Hi newbie to python here,
I have a binary file and i need to change the endian format..little to big as well as vice versa..could anyone help me out.
thanks

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[David M. Wilson]

Amit Gaur <am******@yahoo.com> wrote...

Hi newbie to python here,
I have a binary file and i need to change the endian format..little to big as well as vice versa..could anyone help me out.

If you use the struct module to read the file, this appears to be
handled for you.

http://python.org/doc/current/lib/module-struct.html
Example (pack the value 1234 into an unsigned long in little endian,
then big endian format):

py> import struct
py> struct.pack('<L', 1234)
'\xd2\x04\x00\x00'
py> struct.pack('>L', 1234)
'\x00\x00\x04\xd2'
See also 'struct.unpack', 'socket.htons', and 'socket.htonl'.

[Miki Tebeka]

Hell Amit,

I have a binary file and i need to change the endian format..little to big as
well as vice versa..could anyone help me out.

Warning: Not tested!

#!/usr/bin/env python
from sys import argv
from array import array

a = array("H", open(argv[1], "rb").read())
a.byteswap()
open(argv[2], "wb").write(a.tostring())

HTH.
Miki