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/*
syntax: fontdump videobiosdump.rom
scans for vga fonts of size 8x8, 8x14 and 8x16 and dumps them to files
which you can use in the console like this: setfont or consolechars -f 8x16.fnt
gurkan@linuks.mine.nu, www.linuks.mine.nu
character 0 and 255 are "\0"
meaning we have to look for a pattern like this
\0\0\0\0\\0\0\0\0\ + 253*8 bytes + \0\0\0\0\\0\0\0\0\
if we want a 8x8 font
*/
#include <stdio.h>
#include <strings.h>
#define CHARA 65
char* ID_FONT8="\0\0\0\0\0\0\0\0";
char* ID_FONT14="\0\0\0\0\0\0\0\0\0\0\0\0\0\0";
char* ID_FONT16="\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0";
FILE* f;
unsigned char buffer[256*1024];
char filename[32];
long filesize(FILE* stream)
{
long ret;
long savedpos=ftell(stream);
fseek(stream,0L,SEEK_END);
ret = ftell(stream);
fseek(stream,savedpos,SEEK_SET);
return ret;
}
long dd(long skip, long count)
{
fseek(f,skip,SEEK_SET);
return (fread(buffer,count,1,f));
}
void save(char* filename, long size, long offset)
{
FILE* out;
out=fopen(filename,"w");
fwrite(buffer+offset,size,1,out);
fclose(out);
}
void show(long offset, int character, int fontsize)
{
int x,y;
int bittab[8]={1,2,4,8,16,32,64,128};
for(x=0; x<fontsize; x++) {
for(y=0; y<8; y++) {
if ((buffer[offset+(character*fontsize)+x]) & bittab[y]) {
printf("*");
} else {
printf("-");
}
}
printf("\n");
}
}
int checksumchar(long offset, int character, int fontsize)
{
int x;
int csum=0;
for (x=0; x<fontsize; x++) {
csum+=buffer[offset+(character*fontsize)+x];
}
return csum;
}
int main(int argc, char* argv[])
{
long start,last,location,count;
int a,b,s,size;
if (argc<2) {
printf("Syntax: fontdump video.rom\n");
}
f=fopen(argv[1],"r");
if (f==NULL) {
printf("could not open %s\n",argv[1]);
return 1;
}
start=0;
last=filesize(f);
printf("size %d\n",last);
for (a=start; a<=last; a++) { buffer[a]=0xff; }
dd(0,last);
for (a=start; a<=last; a++) {
location=a;
/*printf("[1GPlease wait, scanning... %d",location);*/
if (bcmp(buffer+a,ID_FONT8,8)==0) {
if (bcmp(buffer+a+(255*8),ID_FONT8,8)==0) {
if (a<=last-(256*8)) {
/*sprintf(filename,"%x.rom",location);*/
if ((checksumchar(a, CHARA, 8)!=0) && (checksumchar(a,32,8)==0)) {
printf("Found FONT8 at %ld\n",location);
/*show(a,CHARA,8);*/
/*sleep(1);*/
save("8x8.fnt",8*256,a);
}
}
}
}
if (bcmp(buffer+a,ID_FONT14,14)==0) {
if (bcmp(buffer+a+(255*14),ID_FONT14,14)==0) {
if (a<=last-(256*14)) {
/*sprintf(filename,"%x.rom",location);
save(filename,size);*/
if ((checksumchar(a, CHARA, 14)!=0) && (checksumchar(a,32,14)==0)) {
printf("Found FONT14 at %ld\n",location);
/*show(a,CHARA,14);*/
/*sleep(1);*/
save("8x14.fnt",14*256,a);
}
}
}
}
if (bcmp(buffer+a,ID_FONT16,16)==0) {
if (bcmp(buffer+a+(255*16),ID_FONT16,16)==0) {
if (a<=last-(256*16)) {
/*sprintf(filename,"%x.rom",location);*/
if ((checksumchar(a, CHARA, 16)!=0) && (checksumchar(a,32,16)==0)) {
printf("Found FONT16 at %ld\n",location);
/*show(a,CHARA,16);*/
/*sleep(1);*/
save("8x16.fnt",16*256,a);
}
}
}
}
}
printf("\n");
fclose(f);
return 0;
}
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