520bps to 512bps

520to512.c

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

int main(int argc, const char *argv[]) {
        const char *filename = argv[1];
        uint8_t *buffer;
        fprintf(stderr, "Converting %s from 520bps to 512bps\n", filename);

        FILE * inFile = fopen(filename, "rb");
        buffer = (uint8_t*) malloc(sizeof(uint8_t)*512);
        fprintf(stderr, "Buffer size: %i\n", sizeof(uint8_t)*512);

        while(fread(buffer, 512, 1, inFile) == 1) {
                fwrite(buffer, 512, 1, stdout);
                if(fseek(inFile, 8, SEEK_CUR) && (feof(inFile) == 0))
                {
                        fprintf(stderr, "Error reading file: %i\n", ferror(inFile));
                        break;
                }
                if(feof(inFile))
                {
                        break;
                }
        }
}

Usage: ./520to512 Disk0.520.img | pv > Disk0.512.img