ti83-sdk/tool/tilem-src/emu/rom.c

119 lines
2.9 KiB
C

/*
* libtilemcore - Graphing calculator emulation library
*
* Copyright (C) 2009 Benjamin Moody
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see
* <http://www.gnu.org/licenses/>.
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdio.h>
#include <string.h>
#include "tilem.h"
static int find_string(const char *str, FILE *romfile,
dword start, dword limit)
{
char buf[256];
int pos = 0;
int len, i;
len = strlen(str);
fseek(romfile, (long int) start, SEEK_SET);
for (i = 0; i < len-1; i++) {
buf[pos] = fgetc(romfile);
pos = (pos+1)%256;
limit--;
}
while (limit > 0 && !feof(romfile) && !ferror(romfile)) {
buf[pos] = fgetc(romfile);
pos = (pos+1)%256;
limit--;
for (i = 0; i < len; i++) {
if (str[i] != buf[(pos + 256 - len + i)%256])
break;
}
if (i == len)
return 1;
}
return 0;
}
char tilem_guess_rom_type(FILE* romfile)
{
unsigned long initpos;
dword size;
char result;
initpos = ftell(romfile);
fseek(romfile, 0L, SEEK_END);
size = ftell(romfile);
if (size >= 0x8000 && size < 0x9000) {
/* 32k: TI-81 (old or new) */
result = TILEM_CALC_TI81;
}
else if (size >= 0x20000 && size < 0x2C000) {
/* 128k: TI-82 or TI-86 */
if (find_string("CATALOG", romfile, 0, 0x20000))
result = TILEM_CALC_TI85;
else
result = TILEM_CALC_TI82;
}
else if (size >= 0x40000 && size < 0x4C000) {
/* 256k: TI-83 (or a variant) or TI-86 */
if (!find_string("TI82", romfile, 0, 0x40000))
result = TILEM_CALC_TI86;
else if (find_string("Termin\x96", romfile, 0, 0x40000))
result = TILEM_CALC_TI76;
else
result = TILEM_CALC_TI83;
}
else if (size >= 0x80000 && size < 0x8C000) {
/* 512k: TI-83 Plus or TI-73 */
if (find_string("TI-83 Plus", romfile, 0, 8 * 0x4000))
result = TILEM_CALC_TI83P;
else
result = TILEM_CALC_TI73;
}
else if (size >= 0x100000 && size < 0x124000) {
/* 1024k: TI-84 Plus */
result = TILEM_CALC_TI84P;
}
else if (size >= 0x200000 && size < 0x224000) {
/* 2048k: TI-83 Plus SE, TI-84 Plus SE */
if (find_string("\xed\xef", romfile, 0x1FC000, 0x4000))
result = TILEM_CALC_TI84P_NSPIRE;
else if (find_string("Operating", romfile, 0x1FC000, 0x4000))
result = TILEM_CALC_TI84P_SE;
else
result = TILEM_CALC_TI83P_SE;
}
else {
result = 0;
}
fseek(romfile, initpos, SEEK_SET);
return result;
}