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