source: thomson/tools/saptofd.c@ e18627d

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

int main(int argc, char* argv[]) {
        FILE *sap, *fd;
        int c, k, j;
        puts("sap2fd - Thomson diskimage converter\nPulkoMandy / Shinra - 2010\n"
                "wtfpl Licance\n");

        if (argc != 2) {
                printf("%s file.sap\n",argv[0]);
                exit(1);
        }

        if (strcasecmp(argv[1] + strlen(argv[1]) - 4,".sap")) {
                printf("%s is no sap\n",argv[1]);
                exit(2);
        }

        printf("Infile : %s\n",argv[1]);

        sap = fopen(argv[1], "rb");
        strcpy((argv[1] + strlen(argv[1]) - 4),".fd");
        fd = fopen(argv[1], "wb");

        printf("Outfile : %s\n",argv[1]);

        for (c = 0; c < 0x40; c++)
                getc(sap);

        k = 0;
        while((c=getc(sap)) != EOF) {
                if (k % 256 == 0)
                        for (j = 0; j <= 5; j++) c = getc(sap);
                if (c == EOF) break;
                putc(c^0xB3,fd);        
                k++;
        }
        

        fclose(sap);
        fclose(fd);
}