#!/usr/bin/env python

# Display a binary (or any) file in chars (if printable), hex and decimal.
# Similar to what od -xc used to do before GNU got hold of it,
# or what xxd (part of the vim package) does,
# but (IMO) with cleaner and more readable output.

# Copyright 2009 by Akkana Peck. Share and enjoy under the GPL v2 or later.

import sys, os
import curses.ascii

do_char = False
do_hex = False
do_dec = False
file_list = []
multi_format = False

def Usage() :
    print "Usage:", os.path.basename(sys.argv[0]), "[-cxd] file ..."
    exit(1)

def parse_opts() :
    global do_char, do_hex, do_dec, file_list, multi_format
    num_formats = 0
    for i in range(1, len(sys.argv)) :
        if sys.argv[i][0] != '-' :
            file_list = sys.argv[i:]
            break
        for c in sys.argv[i][1:] :
            if c == 'c' :
                do_char = True
                num_formats = num_formats + 1
            elif c == 'x' :
                do_hex = True
                num_formats = num_formats + 1
            elif c == 'd' :
                do_dec = True
                num_formats = num_formats + 1
            elif c == 'h' :
                Usage()

    if num_formats == 0 :
        do_char = True
        do_hex = True
        do_dec = True
        num_formats = 3

    if num_formats > 1 :
        multi_format = True

def bdump(filename, do_char, do_hex, do_dec) :
    if len(file_list) > 1 :
        print filename + ":"

    if filename :
        try :
            fp = open(filename, "r")

        except IOError, e:
            print "Can't open", filename, ":\n   ", e
            #sys.exit(e.errno)
            return
    else :
        fp = sys.stdin

    try :
        while True :
            line = fp.read(16)
            if line == "" : break
        
            if do_char :
                for c in line :
                    if curses.ascii.isprint(c) :
                        print "%4c" % (c),
                    elif curses.ascii.iscntrl(c) :
                        print "  ^" + chr(ord(c) + ord('A') - 1),
                    else :
                        print '    ',
                print
        
            if do_hex :
                for c in line :
                    print "%4x" % (ord(c)),
                print
        
            if do_dec :
                for c in line :
                    print "%4d" % (ord(c)),
                print
    
            if multi_format :
                print

    except IOError, e :
        if e.errno == 32 :      # Broken pipe
            sys.exit(0)
        print e
        sys.exit(e)

    fp.close()

# main() :
parse_opts()

if len(file_list) == 0 :
    bdump(None, do_char, do_hex, do_dec)
else :
    for filename in file_list :
        bdump(filename, do_char, do_hex, do_dec)