1 /*
2 * libtilemcore - Graphing calculator emulation library
3 *
4 * Copyright (C) 2009 Benjamin Moody
5 *
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public License
8 * as published by the Free Software Foundation; either version 2.1 of
9 * the License, or (at your option) any later version.
10 *
11 * This library is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, see
18 * <http://www.gnu.org/licenses/>.
19 */
20
21 #ifdef HAVE_CONFIG_H
22 # include <config.h>
23 #endif
24
25 #include <stdio.h>
26 #include <string.h>
27 #include "tilem.h"
28
find_string(const char * str,FILE * romfile,dword start,dword limit)29 static int find_string(const char *str, FILE *romfile,
30 dword start, dword limit)
31 {
32 char buf[256];
33 int pos = 0;
34 int len, i;
35
36 len = strlen(str);
37
38 fseek(romfile, (long int) start, SEEK_SET);
39
40 for (i = 0; i < len-1; i++) {
41 buf[pos] = fgetc(romfile);
42 pos = (pos+1)%256;
43 limit--;
44 }
45
46 while (limit > 0 && !feof(romfile) && !ferror(romfile)) {
47 buf[pos] = fgetc(romfile);
48 pos = (pos+1)%256;
49 limit--;
50
51 for (i = 0; i < len; i++) {
52 if (str[i] != buf[(pos + 256 - len + i)%256])
53 break;
54 }
55 if (i == len)
56 return 1;
57 }
58 return 0;
59 }
60
tilem_guess_rom_type(FILE * romfile)61 char tilem_guess_rom_type(FILE* romfile)
62 {
63 unsigned long initpos;
64 dword size;
65 char result;
66
67 initpos = ftell(romfile);
68
69 fseek(romfile, 0L, SEEK_END);
70 size = ftell(romfile);
71
72 if (size >= 0x8000 && size < 0x9000) {
73 /* 32k: TI-81 (old or new) */
74 result = TILEM_CALC_TI81;
75 }
76 else if (size >= 0x20000 && size < 0x2C000) {
77 /* 128k: TI-82 or TI-86 */
78 if (find_string("CATALOG", romfile, 0, 0x20000))
79 result = TILEM_CALC_TI85;
80 else
81 result = TILEM_CALC_TI82;
82 }
83 else if (size >= 0x40000 && size < 0x4C000) {
84 /* 256k: TI-83 (or a variant) or TI-86 */
85 if (!find_string("TI82", romfile, 0, 0x40000))
86 result = TILEM_CALC_TI86;
87 else if (find_string("Termin\x96", romfile, 0, 0x40000))
88 result = TILEM_CALC_TI76;
89 else
90 result = TILEM_CALC_TI83;
91 }
92 else if (size >= 0x80000 && size < 0x8C000) {
93 /* 512k: TI-83 Plus or TI-73 */
94 if (find_string("TI-83 Plus", romfile, 0, 8 * 0x4000))
95 result = TILEM_CALC_TI83P;
96 else
97 result = TILEM_CALC_TI73;
98 }
99 else if (size >= 0x100000 && size < 0x124000) {
100 /* 1024k: TI-84 Plus */
101 result = TILEM_CALC_TI84P;
102 }
103 else if (size >= 0x200000 && size < 0x224000) {
104 /* 2048k: TI-83 Plus SE, TI-84 Plus SE */
105 if (find_string("\xed\xef", romfile, 0x1FC000, 0x4000))
106 result = TILEM_CALC_TI84P_NSPIRE;
107 else if (find_string("Operating", romfile, 0x1FC000, 0x4000))
108 result = TILEM_CALC_TI84P_SE;
109 else
110 result = TILEM_CALC_TI83P_SE;
111 }
112 else {
113 result = 0;
114 }
115
116 fseek(romfile, initpos, SEEK_SET);
117 return result;
118 }
119