Hexdump and Reverse Hexdump by C and Python.

hex.c

#include <stdio.h>
 
int main(int argc, char *argv[])
{
    int n;
    unsigned long long int count = 0;
    FILE *fp;
 
    if(argc != 2){
        puts("Usage: hex [file_name]");
        return 0;
    }
 
    if((fp = fopen(argv[1], "rb")) == NULL)
        printf("Error: %s is not found.\n", argv[1]);
    else{
        while((n = fgetc(fp)) >= 0){
            printf("%02x ", n);
            count++;
            if(count%16 == 0)
                putchar('\n');
        }
        fclose(fp);
    }
 
    return 0;
}

hex.py

#!/usr/bin/env python
#-*- coding: utf-8 -*-

import sys
 
argv = sys.argv
argc = len(argv)
 
if argc != 2:
    print 'Usage: python hex.py [file_name]'
    quit()
 
count = 0
 
try:
    f = open(argv[1], 'rb')

except:
    print 'Error: %s is not found.' % argv[1]
    quit()

for char in f.read():
    print '%02x' % ord(char),
    count += 1
    if count % 16 == 0:
        print

f.close()

unhex.c

#include <stdio.h>
#include <stdlib.h>
 
int main(int argc, char *argv[])
{
    int n;
    char str[255];
    FILE *fp,*fp2;
 
    if(argc != 2){
        puts("Usage: unhex [file_name]");
        return 0;
    }
 
    if((fp = fopen(argv[1], "rb")) == NULL){
        printf("Error: %s Not Available.\n", argv[1]);
        return 0;
    }
 
    printf("out file name:");
    scanf("%254s%*[^\n]", str);
 
    if((fp2 = fopen(str, "wb")) == NULL){
        printf("Error: %s Not Available.\n", str);
        return 0;
    }
 
    while(fscanf(fp, "%x", &n) != EOF)
        fputc(n, fp2);
 
    fclose(fp);
    fclose(fp2);
 
    return 0;
}

unhex.py

#!/usr/bin/env python
#-*- coding: utf:8 -*-

import sys
 
argv = sys.argv
argc = len(argv)
 
if argc != 2:
    print 'Usage: python unhex.py [file_name]'
    quit()
 
try:
    infile = open(argv[1], 'rb')

except:
    print 'Error: %s is not found.' % argv[1]
    quit()

outfile = open(raw_input('out file name:'), 'wb')
 
a = [str(x) for x in infile.read().split()]

for i in a:
    outfile.write(chr(int(i, 16)))
 
infile.close()
outfile.close()

unhex2.py

#!/usr/bin/env python
#-*- coding: utf:8 -*-

import sys

argv = sys.argv
argc = len(argv)
 
if argc != 2:
    print 'Usage: python unhex.py [file_name]'
    quit()
 
try:
    infile = open(argv[1], 'rb')
    data = infile.read()

except:
    print 'Error: %s is not found.' % argv[1]
    quit()

outfile = open(raw_input('out file name:'), 'wb')

i=0

while i+1 < len(data):
    outfile.write(chr(int(data[i:i+2],16)))
    i+=2

infile.close()
outfile.close()