How can I convert a binary file to another binary representation, like an image

Question

I want to take a binary file (exe, msi, dll, whatever) and be able to actually \"see\" the binary code or whatever base I\'d like (hexadecimal whatever). Figured the easiest

Answer 1

Here's the code to print out the bytes at 1's and 0's in C:

#include 

void putbits(unsigned char byte)
{
    unsigned char mask = 0x01;

    for (int bit = 7; bit >= 0; bit--)
    {
        if ((mask << bit) & byte)
        {
            printf("1");
        }
        else
        {
            printf("0");
        }
    }

    // Uncomment the following line to get each byte on it's own line.
    //printf("\n");
}

int main (int argc, const char * argv[])
{
    int c;

    while ((c = getchar()) != EOF)
    {
        putbits(c);
    }

    return 0;
}

You can build and run it on the command line like this:

gcc main.c --std=c99 -o printer
./printer < printer > printer.txt

It will then output it's 1's and 0's to printer.txt.