Programming in C Base 64 Encode File Write a program that accepts two command li

Question

Programming in C Base 64 Encode File

Write a program that accepts two command line arguments. The first is the name of a file that
is to be used as the input file and the second is the name of the output file.

The program is to base-64 encode the first file, which is to be treated as a binary file, into the
second. The first line of the output file, which is a text file, should contain the name of the first
file (so that the reconstructed data can be placed in a file of the correct name later).Your program should print to the console the total number of bytes contained in the input file.

base-64.c

#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>

char map(unsigned value)
{
   if (value < 26) return 'A' + value;
   if (value < 52) return 'a' + value - 26;
   if (value < 62) return '0' + value - 52;
   if (62 == value) return '+';
   if (63 == value) return '/';
      
   return '?';
}

unsigned unmap(char c)
{
   if ('/' == c)   return 63;
   if ('+' == c)   return 62;
   if (isdigit(c)) return 52 + (c - '0');
   if (islower(c)) return 26 + (c - 'a');
   if (isupper(c)) return 0 + (c - 'A');
      
  
   return 0xFFFFFFFF;
}

int main(void)
{
   char *message = "Hello World!";
  
   unsigned data = 062434752; // 0xCA35EA;
   char chars[4];
  
   printf("DATA: %o ", data);
  
   int i;
   for (i = 0; i < 4; i++)
   {
       unsigned value = (data >> (18 - 6 * i)) & 077;
      
       chars[i] = map(value);
   }
  
   printf("MSG : ");
   int i4;
   for (i4 = 0; i4 < 4; i4++)
   {
      
       printf("%c", chars[i4]);
   }
   printf(" ");
  
   data = 0;
   int i2;
   for (i2 = 0; i2 < 4; i2++)
   {
       unsigned value = unmap(chars[i2]);
      
       data <<= 6;
       data += value;
   }
  
   printf("DATA: %o ", data);

   return EXIT_SUCCESS;
}

Explanation / Answer

Hi,

In order to solve your problem,you have to create the objects of file and fileinputstreams and fileoutputstream and after that you need to pass the objects of the files to the fileinputstreams and fileoutputstreams as follows:

File fs1= new File("name");

Fileinputstream fs1=new FileInputstream(fs1);

In the same way you can go with the fileoutputstream and after that you need to use the inbuilt function of file as length to calculate the length of file and after you can copy the file to another file using the inbuilt function of file.

I hope it will solve your problem.

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