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Fix bug in MED mapper protection bit implementation
author Michael Pavone <pavone@retrodev.com>
date Sun, 28 Apr 2024 23:33:11 -0700
parents cb62730d5c99
children
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1 #include <string.h>
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2 #include <stdlib.h>
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3 #include "system.h"
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4 #include "genesis.h"
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5 #include "gen_player.h"
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6 #include "sms.h"
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7 #include "mediaplayer.h"
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8 #include "coleco.h"
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9 #include "paths.h"
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10 #include "util.h"
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11
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12 uint8_t safe_cmp(char *str, long offset, uint8_t *buffer, long filesize)
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13 {
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14 long len = strlen(str);
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15 return filesize >= offset+len && !memcmp(str, buffer + offset, len);
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16 }
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17
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18 system_type detect_system_type(system_media *media)
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19 {
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20 static char *pico_names[] = {
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21 "SEGA PICO", "SEGATOYS PICO", "SEGA TOYS PICO", "SAMSUNG PICO",
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22 "SEGA IAC", "IMA IKUNOUJYUKU", "IMA IKUNOJYUKU"
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23 };
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24 static const int num_pico = sizeof(pico_names)/sizeof(*pico_names);
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25 for (int i = 0; i < num_pico; i++) {
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26 if (safe_cmp(pico_names[i], 0x100, media->buffer, media->size)) {
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27 return SYSTEM_PICO;
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28 }
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29 }
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30 if (safe_cmp("SEGA", 0x100, media->buffer, media->size)) {
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31 //TODO: support other bootable identifiers
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32 if (safe_cmp("SEGADISCSYSTEM", 0, media->buffer, media->size)) {
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33 return SYSTEM_SEGACD;
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34 }
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35 //TODO: Differentiate between vanilla Genesis and 32X games
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36 return SYSTEM_GENESIS;
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37 }
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38 if (safe_cmp("TMR SEGA", 0x1FF0, media->buffer, media->size)
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39 || safe_cmp("TMR SEGA", 0x3FF0, media->buffer, media->size)
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40 || safe_cmp("TMR SEGA", 0x7FF0, media->buffer, media->size)
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41 ) {
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42 return SYSTEM_SMS;
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43 }
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44 if (media->size > 400) {
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45 uint8_t *buffer = media->buffer;
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46 if (!memcmp(buffer + 4, "\x00\x00\x04\x00", 4) && (buffer[0x80] == 0 || buffer[0x80] == 0xFF)) {
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47 int i = 0x81;
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48 for(; i < 0x400; i++)
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49 {
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50 if (buffer[i] != buffer[0x80]) {
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51 break;
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52 }
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53 }
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54 if (i == 0x400) {
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55 return SYSTEM_COPERA;
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56 }
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57 }
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58 }
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59 if (safe_cmp("BLSTEL\x02", 0, media->buffer, media->size)) {
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60 uint8_t *buffer = media->buffer;
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61 if (media->size > 9 && buffer[7] == 0) {
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62 return buffer[8] + 1;
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63 }
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64 }
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65 if (
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66 safe_cmp("Vgm ", 0, media->buffer, media->size)
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67 || safe_cmp("RIFF", 0, media->buffer, media->size)
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68 || safe_cmp("fLaC", 0, media->buffer, media->size)) {
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69 return SYSTEM_MEDIA_PLAYER;
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70 }
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71 if (
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72 (safe_cmp("\xAA\x55", 0, media->buffer, media->size)
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73 || safe_cmp("\x55\xAA", 0, media->buffer, media->size))
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74 && media->size > 0xB) {
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75 uint8_t *buffer = media->buffer;
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76 if (((buffer[0xB] << 8) | buffer[0xA]) > 0x8000) {
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77 return SYSTEM_COLECOVISION;
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78 }
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79 }
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80
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81
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82 //TODO: Detect Jaguar ROMs here
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83
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84 //Header based detection failed, examine filename for clues
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85 if (media->extension) {
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86 if (!strcmp("md", media->extension) || !strcmp("gen", media->extension)) {
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87 return SYSTEM_GENESIS;
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88 }
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89 if (!strcmp("sms", media->extension) || !strcmp("sg", media->extension) || !strcmp("gg", media->extension)) {
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90 return SYSTEM_SMS;
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91 }
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92 if (!strcmp("j64", media->extension)) {
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93 return SYSTEM_JAGUAR;
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94 }
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95 if (!strcmp("col", media->extension)) {
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96 return SYSTEM_COLECOVISION;
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97 }
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98 }
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99
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100 //More certain checks failed, look for a valid 68K reset vector
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101 if (media->size >= 8) {
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102 char *rom = media->buffer;
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103 uint32_t reset = rom[5] << 16 | rom[6] << 8 | rom[7];
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104 if (!(reset & 1) && reset < media->size) {
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105 //we have a valid looking reset vector, assume it's a Genesis ROM
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106 return SYSTEM_GENESIS;
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107 }
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108 }
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109 return SYSTEM_UNKNOWN;
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110 }
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111
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112 system_header *alloc_config_system(system_type stype, system_media *media, uint32_t opts, uint8_t force_region)
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113 {
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114 void *lock_on = NULL;
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115 uint32_t lock_on_size = 0;
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116 if (media->chain) {
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117 lock_on = media->chain->buffer;
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118 lock_on_size = media->chain->size;
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119 }
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120 switch (stype)
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121 {
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122 case SYSTEM_GENESIS:
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123 return &(alloc_config_genesis(media->buffer, media->size, lock_on, lock_on_size, opts, force_region))->header;
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124 case SYSTEM_GENESIS_PLAYER:
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125 return &(alloc_config_gen_player(media->buffer, media->size))->header;
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parents: 1201
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126 case SYSTEM_SEGACD:
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parents: 1503 1595
diff changeset
127 return &(alloc_config_genesis_cdboot(media, opts, force_region))->header;
1117
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents: 1111
diff changeset
128 #ifndef NO_Z80
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents: 1111
diff changeset
129 case SYSTEM_SMS:
1595
360d5bab199f Update controller config when changed in UI without restart
Michael Pavone <pavone@retrodev.com>
parents: 1201
diff changeset
130 return &(alloc_configure_sms(media, opts, force_region))->header;
2413
64cf80e683aa Initial support for Colecovision emulation
Michael Pavone <pavone@retrodev.com>
parents: 2289
diff changeset
131 case SYSTEM_COLECOVISION:
64cf80e683aa Initial support for Colecovision emulation
Michael Pavone <pavone@retrodev.com>
parents: 2289
diff changeset
132 return &(alloc_configure_coleco(media))->header;
1117
928a65750345 Initial support for Genesis/Megadrive PBC mode. VDP still needs Mode 4 to be useful.
Michael Pavone <pavone@retrodev.com>
parents: 1111
diff changeset
133 #endif
2289
92449b47cce8 Integrate VGM player into main blastem binary
Michael Pavone <pavone@retrodev.com>
parents: 2257
diff changeset
134 case SYSTEM_MEDIA_PLAYER:
92449b47cce8 Integrate VGM player into main blastem binary
Michael Pavone <pavone@retrodev.com>
parents: 2257
diff changeset
135 return &(alloc_media_player(media, opts))->header;
2428
65c2e4d990cc WIP Pico emulation
Michael Pavone <pavone@retrodev.com>
parents: 2413
diff changeset
136 case SYSTEM_PICO:
2459
cb62730d5c99 Initial work on Copera emulation
Michael Pavone <pavone@retrodev.com>
parents: 2457
diff changeset
137 case SYSTEM_COPERA:
cb62730d5c99 Initial work on Copera emulation
Michael Pavone <pavone@retrodev.com>
parents: 2457
diff changeset
138 return &(alloc_config_pico(media->buffer, media->size, lock_on, lock_on_size, opts, force_region, stype))->header;
1111
2eb54e24914e Mostly working changes to allow support for multiple emulated system types in main blastem program
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
139 default:
2eb54e24914e Mostly working changes to allow support for multiple emulated system types in main blastem program
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
140 return NULL;
2eb54e24914e Mostly working changes to allow support for multiple emulated system types in main blastem program
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
141 }
2eb54e24914e Mostly working changes to allow support for multiple emulated system types in main blastem program
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
142 }
1946
c3c62dbf1ceb WIP netplay support
Michael Pavone <pavone@retrodev.com>
parents: 1893
diff changeset
143
c3c62dbf1ceb WIP netplay support
Michael Pavone <pavone@retrodev.com>
parents: 1893
diff changeset
144 system_header *alloc_config_player(system_type stype, event_reader *reader)
c3c62dbf1ceb WIP netplay support
Michael Pavone <pavone@retrodev.com>
parents: 1893
diff changeset
145 {
c3c62dbf1ceb WIP netplay support
Michael Pavone <pavone@retrodev.com>
parents: 1893
diff changeset
146 switch(stype)
c3c62dbf1ceb WIP netplay support
Michael Pavone <pavone@retrodev.com>
parents: 1893
diff changeset
147 {
c3c62dbf1ceb WIP netplay support
Michael Pavone <pavone@retrodev.com>
parents: 1893
diff changeset
148 case SYSTEM_GENESIS:
c3c62dbf1ceb WIP netplay support
Michael Pavone <pavone@retrodev.com>
parents: 1893
diff changeset
149 return &(alloc_config_gen_player_reader(reader))->header;
c3c62dbf1ceb WIP netplay support
Michael Pavone <pavone@retrodev.com>
parents: 1893
diff changeset
150 }
c3c62dbf1ceb WIP netplay support
Michael Pavone <pavone@retrodev.com>
parents: 1893
diff changeset
151 return NULL;
c3c62dbf1ceb WIP netplay support
Michael Pavone <pavone@retrodev.com>
parents: 1893
diff changeset
152 }
1980
81df9aa2de9b Less hacky run on audio thread mode
Michael Pavone <pavone@retrodev.com>
parents: 1946
diff changeset
153
81df9aa2de9b Less hacky run on audio thread mode
Michael Pavone <pavone@retrodev.com>
parents: 1946
diff changeset
154 void system_request_exit(system_header *system, uint8_t force_release)
81df9aa2de9b Less hacky run on audio thread mode
Michael Pavone <pavone@retrodev.com>
parents: 1946
diff changeset
155 {
81df9aa2de9b Less hacky run on audio thread mode
Michael Pavone <pavone@retrodev.com>
parents: 1946
diff changeset
156 system->force_release = force_release;
81df9aa2de9b Less hacky run on audio thread mode
Michael Pavone <pavone@retrodev.com>
parents: 1946
diff changeset
157 system->request_exit(system);
81df9aa2de9b Less hacky run on audio thread mode
Michael Pavone <pavone@retrodev.com>
parents: 1946
diff changeset
158 }
2438
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
159
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
160 void* load_media_subfile(const system_media *media, char *path, uint32_t *sizeout)
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
161 {
2457
9da3de58410d Fix libretro build
Michael Pavone <pavone@retrodev.com>
parents: 2438
diff changeset
162 #ifdef IS_LIB
9da3de58410d Fix libretro build
Michael Pavone <pavone@retrodev.com>
parents: 2438
diff changeset
163 //TODO: Figure out how to handle Pico artwork and similar cases in libretro builds
9da3de58410d Fix libretro build
Michael Pavone <pavone@retrodev.com>
parents: 2438
diff changeset
164 return NULL;
9da3de58410d Fix libretro build
Michael Pavone <pavone@retrodev.com>
parents: 2438
diff changeset
165 #else
2438
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
166 char *to_free = NULL;
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
167 void *buffer = NULL;
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
168 uint32_t size = 0;
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
169 if (media->zip) {
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
170 uint32_t i;
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
171 for (i = 0; i < media->zip->num_entries; i++)
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
172 {
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
173 if (!strcasecmp(media->zip->entries[i].name, path)) {
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
174 break;
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
175 }
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
176 }
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
177 if (i < media->zip->num_entries) {
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
178 size_t zsize = media->zip->entries[i].size + 1;
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
179 buffer = zip_read(media->zip, i, &zsize);
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
180 size = zsize;
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
181 if (buffer) {
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
182 ((uint8_t *)buffer)[size] = 0;
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
183 }
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
184 goto end;
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
185 }
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
186 }
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
187 if (!is_absolute_path(path)) {
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
188 to_free = path = path_append(media->dir, path);
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
189 }
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
190 FILE *f = fopen(path, "rb");
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
191 if (!f) {
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
192 goto end;
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
193 }
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
194 size = file_size(f);
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
195 buffer = calloc(1, size + 1);
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
196 size = fread(buffer, 1, size, f);
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
197 fclose(f);
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
198
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
199 end:
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
200 if (sizeout) {
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
201 *sizeout = size;
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
202 }
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
203 free(to_free);
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
204 return buffer;
2457
9da3de58410d Fix libretro build
Michael Pavone <pavone@retrodev.com>
parents: 2438
diff changeset
205 #endif
2438
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
206 }