CODEWITHSUNDEEP
python
hucuhy
hucuhy

Reputation: 829

Convert file to binary (make a hexdump)

I want to display file that convert to binary like binary editer.

For example, it convert PNG to 89 50 4E 47 0D 0A 1A 0A 00 00 00....

f = open(path, "r")
print f.read() # I want to convert this to binary
f.close()

Please advice me.

Upvotes: 4

Views: 20823

Answers (2)

John1024
John1024

Reputation: 113974

Python 3

To get a binary in a hex representation:

bin_data = open(path, 'rb').read()
import codecs
hex_data = codecs.encode(bin_data, "hex_codec")

If path refers to a PNG file, then the first few bytes of bin_data will look like \x89PNG\r\n and the beginning of hex_data will look like 89504e470d0a. To format it nicely, add spaces:

import re
hex_with_spaces =  re.sub('(..)', r'\1 ', hex_data)

The corresponding first few bytes of hex_with_spaces will look like 89 50 4e 47 0d 0a.

As an alternative to codecs, the binascii can be used:

import binascii
hex_data = binascii.hexlify(bin_data)

See jfs's answer for a more detailed example using binascii.

Python 2

To get a binary in a hex representation:

bin_data = open(path, 'rb').read()
hex_data = bin_data.encode('hex')

If path refers to a PNG file, then the first few bytes of bin_data will look like \x89PNG\r\n and the beginning of hex_data will look like 89504e470d0a. To format it nicely, add spaces:

import re
hex_with_spaces =  re.sub('(..)', r'\1 ', hex_data)

The corresponding first few bytes of hex_with_spaces will look like 89 50 4e 47 0d 0a.

Upvotes: 6

jfs
jfs

Reputation: 414825

To support both Python 2 and 3, you could use binascii.hexlify() instead of .encode('hex'):

#!/usr/bin/env python
"""Make a hexdump"""
import re
import sys
from binascii import hexlify
from functools import partial

def hexdump(filename, chunk_size=1<<15):
    add_spaces = partial(re.compile(b'(..)').sub, br'\1 ')
    write = getattr(sys.stdout, 'buffer', sys.stdout).write
    with open(filename, 'rb') as file:
        for chunk in iter(partial(file.read, chunk_size), b''):
            write(add_spaces(hexlify(chunk)))

hexdump(sys.argv[1])

Note: the file is opened in binary mode, to avoid corrupting the data due to newline conversions enabled for text file such as '\r\n' -> '\n'.

Upvotes: 3

Related Questions