|
|
@@ -0,0 +1,53 @@ |
|
|
|
/* ./smsrom fname |
|
|
|
|
|
|
|
Transforms binary at fname into an 8K, 16K or 32K Sega Master System ROM with |
|
|
|
a header fit for an Export SMS. The resulting ROM is spit to stdout. |
|
|
|
|
|
|
|
Whether the ROM is 8, 16 or 32K depends on the size of binary at fname. |
|
|
|
*/ |
|
|
|
#include <stdio.h> |
|
|
|
#include <inttypes.h> |
|
|
|
|
|
|
|
int main(int argc, char **argv) |
|
|
|
{ |
|
|
|
if (argc != 2) { |
|
|
|
fprintf(stderr, "Usage: ./smsrom fname\n"); |
|
|
|
return 1; |
|
|
|
} |
|
|
|
FILE *fp = fopen(argv[1], "r"); |
|
|
|
if (!fp) { |
|
|
|
fprintf(stderr, "Can't open %s.\n", argv[1]); |
|
|
|
return 1; |
|
|
|
} |
|
|
|
fseek(fp, 0, SEEK_END); |
|
|
|
long fsize = ftell(fp); |
|
|
|
fseek(fp, 0, SEEK_SET); |
|
|
|
uint8_t hdsz = 0x4a; // size flag in header. either 4a, 4b or 4c. |
|
|
|
int romsize = 0x2000; |
|
|
|
while (romsize-16 < fsize) { |
|
|
|
romsize *= 2; |
|
|
|
hdsz++; |
|
|
|
if (romsize > 0x8000) { |
|
|
|
fprintf(stderr, "binary too big\n"); |
|
|
|
return 1; |
|
|
|
} |
|
|
|
} |
|
|
|
uint16_t chksum = 0; |
|
|
|
for (int i=0; i<romsize-16; i++) { |
|
|
|
int c = getc(fp); |
|
|
|
if (c == EOF) c = 0; |
|
|
|
putchar(c); |
|
|
|
chksum += c; |
|
|
|
} |
|
|
|
// and now, the header |
|
|
|
printf("TMR SEGA"); |
|
|
|
putchar(0); |
|
|
|
putchar(0); |
|
|
|
putchar(chksum & 0xff); |
|
|
|
putchar(chksum >> 8); |
|
|
|
putchar(0); |
|
|
|
putchar(0); |
|
|
|
putchar(0); |
|
|
|
putchar(hdsz); |
|
|
|
return 0; |
|
|
|
} |