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annotate system.c @ 2438:bed4d3db8a3f

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More flexible loading of Pico storyware assets
author Michael Pavone <pavone@retrodev.com>
date Sun, 11 Feb 2024 11:04:39 -0800
parents 65c2e4d990cc
children 9da3de58410d
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1 #include <string.h>
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2 #include "system.h"
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3 #include "genesis.h"
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4 #include "gen_player.h"
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5 #include "sms.h"
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6 #include "mediaplayer.h"
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7 #include "coleco.h"
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8 #include "paths.h"
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9 #include "util.h"
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11 uint8_t safe_cmp(char *str, long offset, uint8_t *buffer, long filesize)
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12 {
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13 long len = strlen(str);
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14 return filesize >= offset+len && !memcmp(str, buffer + offset, len);
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15 }
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16
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17 system_type detect_system_type(system_media *media)
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18 {
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19 static char *pico_names[] = {
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20 "SEGA PICO", "SEGATOYS PICO", "SEGA TOYS PICO", "SAMSUNG PICO",
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21 "SEGA IAC", "IMA IKUNOUJYUKU", "IMA IKUNOJYUKU"
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22 };
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23 static const int num_pico = sizeof(pico_names)/sizeof(*pico_names);
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24 for (int i = 0; i < num_pico; i++) {
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25 if (safe_cmp(pico_names[i], 0x100, media->buffer, media->size)) {
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26 return SYSTEM_PICO;
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27 }
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28 }
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29 if (safe_cmp("SEGA", 0x100, media->buffer, media->size)) {
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30 //TODO: support other bootable identifiers
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31 if (safe_cmp("SEGADISCSYSTEM", 0, media->buffer, media->size)) {
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32 return SYSTEM_SEGACD;
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33 }
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34 //TODO: Differentiate between vanilla Genesis and 32X games
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35 return SYSTEM_GENESIS;
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36 }
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37 if (safe_cmp("TMR SEGA", 0x1FF0, media->buffer, media->size)
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38 || safe_cmp("TMR SEGA", 0x3FF0, media->buffer, media->size)
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39 || safe_cmp("TMR SEGA", 0x7FF0, media->buffer, media->size)
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40 ) {
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41 return SYSTEM_SMS;
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42 }
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43 if (safe_cmp("BLSTEL\x02", 0, media->buffer, media->size)) {
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44 uint8_t *buffer = media->buffer;
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45 if (media->size > 9 && buffer[7] == 0) {
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46 return buffer[8] + 1;
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47 }
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48 }
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49 if (
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50 safe_cmp("Vgm ", 0, media->buffer, media->size)
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51 || safe_cmp("RIFF", 0, media->buffer, media->size)
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52 || safe_cmp("fLaC", 0, media->buffer, media->size)) {
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53 return SYSTEM_MEDIA_PLAYER;
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54 }
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55 if (
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56 (safe_cmp("\xAA\x55", 0, media->buffer, media->size)
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57 || safe_cmp("\x55\xAA", 0, media->buffer, media->size))
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58 && media->size > 0xB) {
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59 uint8_t *buffer = media->buffer;
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60 if (((buffer[0xB] << 8) | buffer[0xA]) > 0x8000) {
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61 return SYSTEM_COLECOVISION;
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62 }
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63 }
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64
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65
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66 //TODO: Detect Jaguar ROMs here
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67
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68 //Header based detection failed, examine filename for clues
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69 if (media->extension) {
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70 if (!strcmp("md", media->extension) || !strcmp("gen", media->extension)) {
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71 return SYSTEM_GENESIS;
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72 }
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73 if (!strcmp("sms", media->extension) || !strcmp("sg", media->extension) || !strcmp("gg", media->extension)) {
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74 return SYSTEM_SMS;
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75 }
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76 if (!strcmp("j64", media->extension)) {
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77 return SYSTEM_JAGUAR;
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78 }
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79 if (!strcmp("col", media->extension)) {
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80 return SYSTEM_COLECOVISION;
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81 }
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82 }
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83
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84 //More certain checks failed, look for a valid 68K reset vector
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85 if (media->size >= 8) {
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86 char *rom = media->buffer;
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87 uint32_t reset = rom[5] << 16 | rom[6] << 8 | rom[7];
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88 if (!(reset & 1) && reset < media->size) {
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89 //we have a valid looking reset vector, assume it's a Genesis ROM
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90 return SYSTEM_GENESIS;
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91 }
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92 }
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93 return SYSTEM_UNKNOWN;
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94 }
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95
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96 system_header *alloc_config_system(system_type stype, system_media *media, uint32_t opts, uint8_t force_region)
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97 {
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98 void *lock_on = NULL;
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99 uint32_t lock_on_size = 0;
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100 if (media->chain) {
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101 lock_on = media->chain->buffer;
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102 lock_on_size = media->chain->size;
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103 }
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104 switch (stype)
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105 {
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106 case SYSTEM_GENESIS:
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107 return &(alloc_config_genesis(media->buffer, media->size, lock_on, lock_on_size, opts, force_region))->header;
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108 case SYSTEM_GENESIS_PLAYER:
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109 return &(alloc_config_gen_player(media->buffer, media->size))->header;
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110 case SYSTEM_SEGACD:
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111 return &(alloc_config_genesis_cdboot(media, opts, force_region))->header;
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112 #ifndef NO_Z80
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113 case SYSTEM_SMS:
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114 return &(alloc_configure_sms(media, opts, force_region))->header;
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115 case SYSTEM_COLECOVISION:
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116 return &(alloc_configure_coleco(media))->header;
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117 #endif
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118 case SYSTEM_MEDIA_PLAYER:
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119 return &(alloc_media_player(media, opts))->header;
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120 case SYSTEM_PICO:
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121 return &(alloc_config_pico(media->buffer, media->size, lock_on, lock_on_size, opts, force_region))->header;
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122 default:
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123 return NULL;
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124 }
2eb54e24914e Mostly working changes to allow support for multiple emulated system types in main blastem program
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
125 }
1946
c3c62dbf1ceb WIP netplay support
Michael Pavone <pavone@retrodev.com>
parents: 1893
diff changeset
126
c3c62dbf1ceb WIP netplay support
Michael Pavone <pavone@retrodev.com>
parents: 1893
diff changeset
127 system_header *alloc_config_player(system_type stype, event_reader *reader)
c3c62dbf1ceb WIP netplay support
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parents: 1893
diff changeset
128 {
c3c62dbf1ceb WIP netplay support
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parents: 1893
diff changeset
129 switch(stype)
c3c62dbf1ceb WIP netplay support
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parents: 1893
diff changeset
130 {
c3c62dbf1ceb WIP netplay support
Michael Pavone <pavone@retrodev.com>
parents: 1893
diff changeset
131 case SYSTEM_GENESIS:
c3c62dbf1ceb WIP netplay support
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parents: 1893
diff changeset
132 return &(alloc_config_gen_player_reader(reader))->header;
c3c62dbf1ceb WIP netplay support
Michael Pavone <pavone@retrodev.com>
parents: 1893
diff changeset
133 }
c3c62dbf1ceb WIP netplay support
Michael Pavone <pavone@retrodev.com>
parents: 1893
diff changeset
134 return NULL;
c3c62dbf1ceb WIP netplay support
Michael Pavone <pavone@retrodev.com>
parents: 1893
diff changeset
135 }
1980
81df9aa2de9b Less hacky run on audio thread mode
Michael Pavone <pavone@retrodev.com>
parents: 1946
diff changeset
136
81df9aa2de9b Less hacky run on audio thread mode
Michael Pavone <pavone@retrodev.com>
parents: 1946
diff changeset
137 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
138 {
81df9aa2de9b Less hacky run on audio thread mode
Michael Pavone <pavone@retrodev.com>
parents: 1946
diff changeset
139 system->force_release = force_release;
81df9aa2de9b Less hacky run on audio thread mode
Michael Pavone <pavone@retrodev.com>
parents: 1946
diff changeset
140 system->request_exit(system);
81df9aa2de9b Less hacky run on audio thread mode
Michael Pavone <pavone@retrodev.com>
parents: 1946
diff changeset
141 }
2438
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
142
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
143 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
144 {
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
145 char *to_free = NULL;
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
146 void *buffer = NULL;
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
147 uint32_t size = 0;
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
148 if (media->zip) {
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
149 uint32_t i;
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
150 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
151 {
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
152 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
153 break;
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
154 }
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
155 }
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
156 if (i < media->zip->num_entries) {
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
157 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
158 buffer = zip_read(media->zip, i, &zsize);
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
159 size = zsize;
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
160 if (buffer) {
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
161 ((uint8_t *)buffer)[size] = 0;
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
162 }
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
163 goto end;
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
164 }
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
165 }
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
166 if (!is_absolute_path(path)) {
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
167 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
168 }
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
169 FILE *f = fopen(path, "rb");
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
170 if (!f) {
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
171 goto end;
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 size = file_size(f);
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
174 buffer = calloc(1, size + 1);
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
175 size = fread(buffer, 1, size, f);
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
176 fclose(f);
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
177
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
178 end:
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
179 if (sizeout) {
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
180 *sizeout = size;
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
181 }
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
182 free(to_free);
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
183 return buffer;
bed4d3db8a3f More flexible loading of Pico storyware assets
Michael Pavone <pavone@retrodev.com>
parents: 2428
diff changeset
184 }