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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/* This program takes a ttc file and turns it into its component ttf files */
/* This makes two changes to the data: */
/* * The tables are placed at different offsets, therefore */
/* the offset fields in the table header are also different. */
/* * the 'head' table checksumAdjustment field is set correctly */
#define CHR(ch1,ch2,ch3,ch4) (((ch1)<<24)|((ch2)<<16)|((ch3)<<8)|(ch4))
static void putshort(FILE *file,int sval) {
putc((sval>>8)&0xff,file);
putc(sval&0xff,file);
}
static void putlong(FILE *file,int val) {
putc((val>>24)&0xff,file);
putc((val>>16)&0xff,file);
putc((val>>8)&0xff,file);
putc(val&0xff,file);
}
static int getushort(FILE *ttf) {
int ch1 = getc(ttf);
int ch2 = getc(ttf);
if ( ch2==EOF )
return( EOF );
return( (ch1<<8)|ch2 );
}
static int getlong(FILE *ttf) {
int ch1 = getc(ttf);
int ch2 = getc(ttf);
int ch3 = getc(ttf);
int ch4 = getc(ttf);
if ( ch4==EOF )
return( EOF );
return( (ch1<<24)|(ch2<<16)|(ch3<<8)|ch4 );
}
static unsigned int filecheck(FILE *file) {
unsigned int sum = 0, chunk;
rewind(file);
while ( 1 ) {
chunk = getlong(file);
if ( feof(file) || ferror(file))
break;
sum += chunk;
}
return( sum );
}
static void copytable(FILE *ttf,FILE *ttc,int offset,int length) {
int i, ch;
fseek(ttc,offset,SEEK_SET);
for ( i=0; i<length && (ch=getc(ttc))!=EOF ; ++i )
putc(ch,ttf);
if ( ch==EOF )
fprintf( stderr, "File ended before table\n" );
if ( length&1 ) {
putc('\0',ttf);
++length;
}
if ( length & 2 ) {
putshort(ttf,0);
}
}
static int handlefont(char *filename,int which,FILE *ttc,int offset) {
char outfile[2000], *pt;
FILE *ttf;
int i, cnt, *offsets, *lengths, head, tag, pos, headpos;
strcpy(outfile,filename);
pt = strrchr(outfile,'.');
if ( pt==NULL )
pt = outfile + strlen(outfile);
sprintf( pt, "_%02d.ttf", which );
ttf = fopen( outfile,"wb");
if ( ttf==NULL ) {
fprintf( stderr, "Failed to open %s for output.\n", outfile );
return( -3 );
}
printf ( "%s ", outfile );
fseek(ttc,offset,SEEK_SET);
putlong(ttf,getlong(ttc)); /* sfnt version */
putshort(ttf,cnt = getushort(ttc)); /* table cnt */
putshort(ttf,getushort(ttc)); /* binary search header */
putshort(ttf,getushort(ttc));
putshort(ttf,getushort(ttc));
offsets = malloc(cnt*sizeof(int));
lengths = malloc(cnt*sizeof(int));
head = -1;
for ( i=0; i<cnt; ++i ) {
tag = getlong(ttc);
if ( tag==CHR('h','e','a','d'))
head = i;
putlong(ttf,tag);
putlong(ttf,getlong(ttc)); /* checksum */
putlong(ttf,offsets[i] = getlong(ttc)); /* Reserve space for offset, will fix later */
putlong(ttf,lengths[i] = getlong(ttc));
}
headpos = -1;
for ( i=0; i<cnt; ++i ) {
pos = ftell(ttf);
copytable(ttf,ttc,offsets[i],lengths[i]);
if ( i==head ) {
fseek(ttf,pos+8,SEEK_SET);
putlong(ttf,0);
headpos = pos;
}
fseek(ttf,12+i*16+8,SEEK_SET);
putlong(ttf,pos); /* Fix offset here */
fseek(ttf,0,SEEK_END);
}
if ( headpos!=-1 ) {
unsigned int checksum;
checksum = filecheck(ttf);
checksum = 0xb1b0afba-checksum;
fseek(ttf,headpos+2*sizeof(int),SEEK_SET);
putlong(ttf,checksum);
}
fclose(ttf);
free(offsets); free(lengths);
return( 0 );
}
static int handlefile(char *filename) {
FILE *ttc = fopen(filename,"rb");
int version, cnt, e, i;
int *offsets;
if ( ttc==NULL ) {
fprintf( stderr, "Could not open %s\n", filename );
return( -1 );
}
version = getlong(ttc);
if ( version!=CHR('t','t','c','f')) {
fprintf( stderr, "%s does not look like a ttc file, bad version.\n", filename );
fclose(ttc);
return( -2 );
}
version = getlong(ttc);
if ( version!=0x10000 && version != 0x20000 )
fprintf( stderr, "Unexpected ttc version number: %08x\n", (unsigned int)(version) );
cnt = getlong(ttc);
offsets = malloc(cnt*sizeof(int));
for ( i=0; i<cnt; ++i )
offsets[i] = getlong(ttc);
printf( "%s => ", filename );
for ( i=0; i<cnt; ++i )
if ( (e = handlefont(filename,i,ttc,offsets[i])) ) {
fclose(ttc);
free(offsets);
return( e );
};
printf( "\n" );
fclose(ttc);
free(offsets);
return( 0 );
}
int main(int argc, char *argv[]) {
int e, i;
for ( i=1; i<argc; ++i )
if ( (e = handlefile(argv[i])) )
return( e );
return( 0 );
}
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