Mercurial > repos > blastem
annotate system.c @ 2430:fb8d6ebf9d5f
Fix crash when loading new ROM via drag/drop when existing ROM has lock-on
author | Michael Pavone <pavone@retrodev.com> |
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date | Tue, 06 Feb 2024 06:34:49 -0800 |
parents | 65c2e4d990cc |
children | bed4d3db8a3f |
rev | line source |
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1 #include <string.h> |
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2 #include "system.h" |
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3 #include "genesis.h" |
1946 | 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 |
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9 uint8_t safe_cmp(char *str, long offset, uint8_t *buffer, long filesize) |
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10 { |
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11 long len = strlen(str); |
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12 return filesize >= offset+len && !memcmp(str, buffer + offset, len); |
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13 } |
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14 |
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15 system_type detect_system_type(system_media *media) |
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16 { |
2428 | 17 static char *pico_names[] = { |
18 "SEGA PICO", "SEGATOYS PICO", "SEGA TOYS PICO", "SAMSUNG PICO", | |
19 "SEGA IAC", "IMA IKUNOUJYUKU", "IMA IKUNOJYUKU" | |
20 }; | |
21 static const int num_pico = sizeof(pico_names)/sizeof(*pico_names); | |
22 for (int i = 0; i < num_pico; i++) { | |
23 if (safe_cmp(pico_names[i], 0x100, media->buffer, media->size)) { | |
24 return SYSTEM_PICO; | |
25 } | |
26 } | |
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27 if (safe_cmp("SEGA", 0x100, media->buffer, media->size)) { |
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28 //TODO: support other bootable identifiers |
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29 if (safe_cmp("SEGADISCSYSTEM", 0, media->buffer, media->size)) { |
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30 return SYSTEM_SEGACD; |
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31 } |
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32 //TODO: Differentiate between vanilla Genesis and 32X games |
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33 return SYSTEM_GENESIS; |
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34 } |
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35 if (safe_cmp("TMR SEGA", 0x1FF0, media->buffer, media->size) |
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36 || safe_cmp("TMR SEGA", 0x3FF0, media->buffer, media->size) |
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37 || safe_cmp("TMR SEGA", 0x7FF0, media->buffer, media->size) |
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38 ) { |
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39 return SYSTEM_SMS; |
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40 } |
1946 | 41 if (safe_cmp("BLSTEL\x02", 0, media->buffer, media->size)) { |
42 uint8_t *buffer = media->buffer; | |
43 if (media->size > 9 && buffer[7] == 0) { | |
44 return buffer[8] + 1; | |
45 } | |
46 } | |
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47 if ( |
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48 safe_cmp("Vgm ", 0, media->buffer, media->size) |
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49 || safe_cmp("RIFF", 0, media->buffer, media->size) |
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50 || safe_cmp("fLaC", 0, media->buffer, media->size)) { |
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51 return SYSTEM_MEDIA_PLAYER; |
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52 } |
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53 if ( |
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54 (safe_cmp("\xAA\x55", 0, media->buffer, media->size) |
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55 || safe_cmp("\x55\xAA", 0, media->buffer, media->size)) |
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56 && media->size > 0xB) { |
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57 uint8_t *buffer = media->buffer; |
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58 if (((buffer[0xB] << 8) | buffer[0xA]) > 0x8000) { |
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59 return SYSTEM_COLECOVISION; |
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60 } |
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61 } |
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62 |
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63 |
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64 //TODO: Detect Jaguar ROMs here |
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65 |
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66 //Header based detection failed, examine filename for clues |
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67 if (media->extension) { |
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68 if (!strcmp("md", media->extension) || !strcmp("gen", media->extension)) { |
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69 return SYSTEM_GENESIS; |
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70 } |
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71 if (!strcmp("sms", media->extension) || !strcmp("sg", media->extension) || !strcmp("gg", media->extension)) { |
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72 return SYSTEM_SMS; |
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73 } |
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74 if (!strcmp("j64", media->extension)) { |
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75 return SYSTEM_JAGUAR; |
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76 } |
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77 if (!strcmp("col", media->extension)) { |
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78 return SYSTEM_COLECOVISION; |
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79 } |
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80 } |
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81 |
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82 //More certain checks failed, look for a valid 68K reset vector |
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83 if (media->size >= 8) { |
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84 char *rom = media->buffer; |
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85 uint32_t reset = rom[5] << 16 | rom[6] << 8 | rom[7]; |
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86 if (!(reset & 1) && reset < media->size) { |
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87 //we have a valid looking reset vector, assume it's a Genesis ROM |
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88 return SYSTEM_GENESIS; |
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89 } |
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90 } |
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91 return SYSTEM_UNKNOWN; |
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92 } |
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93 |
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94 system_header *alloc_config_system(system_type stype, system_media *media, uint32_t opts, uint8_t force_region) |
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95 { |
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96 void *lock_on = NULL; |
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97 uint32_t lock_on_size = 0; |
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98 if (media->chain) { |
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99 lock_on = media->chain->buffer; |
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100 lock_on_size = media->chain->size; |
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101 } |
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102 switch (stype) |
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103 { |
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104 case SYSTEM_GENESIS: |
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105 return &(alloc_config_genesis(media->buffer, media->size, lock_on, lock_on_size, opts, force_region))->header; |
1946 | 106 case SYSTEM_GENESIS_PLAYER: |
107 return &(alloc_config_gen_player(media->buffer, media->size))->header; | |
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108 case SYSTEM_SEGACD: |
1692 | 109 return &(alloc_config_genesis_cdboot(media, opts, force_region))->header; |
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110 #ifndef NO_Z80 |
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111 case SYSTEM_SMS: |
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112 return &(alloc_configure_sms(media, opts, force_region))->header; |
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113 case SYSTEM_COLECOVISION: |
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114 return &(alloc_configure_coleco(media))->header; |
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115 #endif |
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116 case SYSTEM_MEDIA_PLAYER: |
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117 return &(alloc_media_player(media, opts))->header; |
2428 | 118 case SYSTEM_PICO: |
119 return &(alloc_config_pico(media->buffer, media->size, lock_on, lock_on_size, opts, force_region))->header; | |
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120 default: |
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121 return NULL; |
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122 } |
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123 } |
1946 | 124 |
125 system_header *alloc_config_player(system_type stype, event_reader *reader) | |
126 { | |
127 switch(stype) | |
128 { | |
129 case SYSTEM_GENESIS: | |
130 return &(alloc_config_gen_player_reader(reader))->header; | |
131 } | |
132 return NULL; | |
133 } | |
1980
81df9aa2de9b
Less hacky run on audio thread mode
Michael Pavone <pavone@retrodev.com>
parents:
1946
diff
changeset
|
134 |
81df9aa2de9b
Less hacky run on audio thread mode
Michael Pavone <pavone@retrodev.com>
parents:
1946
diff
changeset
|
135 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
|
136 { |
81df9aa2de9b
Less hacky run on audio thread mode
Michael Pavone <pavone@retrodev.com>
parents:
1946
diff
changeset
|
137 system->force_release = force_release; |
81df9aa2de9b
Less hacky run on audio thread mode
Michael Pavone <pavone@retrodev.com>
parents:
1946
diff
changeset
|
138 system->request_exit(system); |
81df9aa2de9b
Less hacky run on audio thread mode
Michael Pavone <pavone@retrodev.com>
parents:
1946
diff
changeset
|
139 } |