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/*

 * This program is for setting TTF files to Installable Embedding mode.

 *

 * Note that using this to embed fonts which you are not licensed to embed

 * does not make it legal.

 *

 * This code was written by Tom Murphy 7, and is public domain. Use at your

 * own risk...

*/

#include <stdio.h>

#include <stdlib.h>

void fatal();

int main (int argc, char**argv) {

     FILE * inways;

     if (argc != 2)

        printf("Usage: %s font.ttf\n\nPublic Domain software by Tom 7. Use at your own risk.\n",argv[0]);

     else if (inways = fopen(argv[1],"rb+")) {

        int a,x;

        char type[5];

        type[4]=0;

        fseek(inways,12,0);

        for (;;) {

           for (x=0;x<4;x++) if (EOF == (type[x] = getc(inways))) fatal();

           if (!strcmp(type,"OS/2")) {

              int length;

              unsigned long loc, fstype, sum=0;

              loc=ftell(inways); /* location for checksum */

              for (x=4;x--;) if (EOF == getc(inways)) fatal();

              fstype  = fgetc(inways) << 24;

              fstype |= fgetc(inways) << 16;

              fstype |= fgetc(inways) << 8 ;

              fstype |= fgetc(inways)      ;

              length  = fgetc(inways) << 24;

              length |= fgetc(inways) << 16;

              length |= fgetc(inways) << 8 ;

              length |= fgetc(inways)      ;

/*              printf("fstype: %d length: %d\n",fstype,length);*/

              if (fseek(inways,fstype+8,0)) fatal();

              fputc(0,inways);

              fputc(0,inways);

              fseek(inways,fstype,0);

              for (x=length;x--;)

                  sum += fgetc(inways);

              fseek(inways,loc,0); /* write checksum */

              fputc(sum>>24,inways);

              fputc(255&(sum>>16),inways);

              fputc(255&(sum>>8), inways);

              fputc(255&sum    ,  inways);

              fclose(inways);

              exit(0);

           }

           for (x=12;x--;) if (EOF == getc(inways)) fatal();

        }

     } else

        printf("I wasn't able to open the file %s.\n", argv[1]);

}

void fatal() { fprintf(stderr,"Malformed TTF file.\n");

               exit(-1); }