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/*
gcc ree.c -o ree.bin
rom extension extractor (ported to shell from the pascal version of 1997)
(and now it is .c, and like 69 times faster or so)
see http://www.firmware.com/support/bios/romext.htm for more info
extracts system, scsi, video bios
gurkan@linuks.mine.nu, www.linuks.mine.nu
a checksum of 0 is ok! any other number indicates it is either not a rom
extension or the rom is defective
scan from c0000 - f0000 in 512 byte blocks
U{l}{code}
l*512=length of the code including headers
*/
#include <stdio.h>
#include <strings.h>
#include <string.h>
char* ID_ROMEXT="U"; /* 0x55aa */
FILE* f;
unsigned char buffer[256*1024];
char filename[32];
void dd(long skip, long count)
{
fseek(f,skip,SEEK_SET);
fread(buffer,count,1,f);
}
void save(char* filename,long size)
{
FILE* out;
out=fopen(filename,"w");
fwrite(buffer,size,1,out);
fclose(out);
}
unsigned char checksum(long size)
{
unsigned sum=0;
int c;
for (c=0; c<size; c++) sum+=buffer[c];
return (sum);
}
int main(int argc, char* argv[])
{
long start,last,location,count;
int a,b,s,size;
f=fopen("/dev/mem","r");
if (f==NULL) {
printf("could not open /dev/mem\n");
printf("(are you root?)\n");
return 1;
}
start=0xc0000;
last=0xf0000;
for (a=start; a<=last; a+=512) {
dd(a,3);
location=a;
printf("[1GPlease wait, scanning... %x",location);
if (strncmp(buffer,ID_ROMEXT,2)==0) {
size=buffer[2]*512;
dd( a,size );
printf("\nFound something at %x (%d bytes) (checksum %d)\n",location,size,checksum(size));
sprintf(filename,"%x.rom",location);
save(filename,size);
}
}
/* save bios rom */
/* start=0xf0000;
count=1*65536;
dd( start,count );
printf("\nFound system bios at F0000 (65536) (checksum %d)\n",checksum(count));
sprintf(filename,"%x.rom",start);
save(filename,count); */
printf("\n");
fclose(f);
return 0;
}
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