Mercurial > repos > blastem
annotate system.c @ 2149:9209858b2f74
Fix a couple of bugs in the TOC file parser
author | Michael Pavone <pavone@retrodev.com> |
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date | Sat, 26 Mar 2022 23:05:08 -0700 |
parents | 3414a4423de1 |
children | 1e626d0ecf9c |
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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 |
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7 uint8_t safe_cmp(char *str, long offset, uint8_t *buffer, long filesize) |
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8 { |
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9 long len = strlen(str); |
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10 return filesize >= offset+len && !memcmp(str, buffer + offset, len); |
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11 } |
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12 |
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13 system_type detect_system_type(system_media *media) |
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14 { |
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15 if (safe_cmp("SEGA", 0x100, media->buffer, media->size)) { |
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16 //TODO: support other bootable identifiers |
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17 if (safe_cmp("SEGADISCSYSTEM", 0, media->buffer, media->size)) { |
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18 return SYSTEM_SEGACD; |
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19 } |
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20 //TODO: Differentiate between vanilla Genesis and 32X games |
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21 return SYSTEM_GENESIS; |
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22 } |
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23 if (safe_cmp("TMR SEGA", 0x1FF0, media->buffer, media->size) |
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24 || safe_cmp("TMR SEGA", 0x3FF0, media->buffer, media->size) |
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25 || safe_cmp("TMR SEGA", 0x7FF0, media->buffer, media->size) |
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26 ) { |
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27 return SYSTEM_SMS; |
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28 } |
1946 | 29 if (safe_cmp("BLSTEL\x02", 0, media->buffer, media->size)) { |
30 uint8_t *buffer = media->buffer; | |
31 if (media->size > 9 && buffer[7] == 0) { | |
32 return buffer[8] + 1; | |
33 } | |
34 } | |
35 | |
36 | |
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37 //TODO: Detect Jaguar ROMs here |
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38 |
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39 //Header based detection failed, examine filename for clues |
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40 if (media->extension) { |
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41 if (!strcmp("md", media->extension) || !strcmp("gen", media->extension)) { |
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42 return SYSTEM_GENESIS; |
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43 } |
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44 if (!strcmp("sms", media->extension)) { |
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45 return SYSTEM_SMS; |
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46 } |
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47 if (!strcmp("j64", media->extension)) { |
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48 return SYSTEM_JAGUAR; |
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49 } |
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50 } |
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51 |
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52 //More certain checks failed, look for a valid 68K reset vector |
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53 if (media->size >= 8) { |
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54 char *rom = media->buffer; |
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55 uint32_t reset = rom[5] << 16 | rom[6] << 8 | rom[7]; |
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56 if (!(reset & 1) && reset < media->size) { |
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57 //we have a valid looking reset vector, assume it's a Genesis ROM |
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58 return SYSTEM_GENESIS; |
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59 } |
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60 } |
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61 return SYSTEM_UNKNOWN; |
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62 } |
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63 |
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64 system_header *alloc_config_system(system_type stype, system_media *media, uint32_t opts, uint8_t force_region) |
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65 { |
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66 void *lock_on = NULL; |
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67 uint32_t lock_on_size = 0; |
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68 if (media->chain) { |
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69 lock_on = media->chain->buffer; |
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70 lock_on_size = media->chain->size; |
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71 } |
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72 switch (stype) |
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73 { |
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74 case SYSTEM_GENESIS: |
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75 return &(alloc_config_genesis(media->buffer, media->size, lock_on, lock_on_size, opts, force_region))->header; |
1946 | 76 case SYSTEM_GENESIS_PLAYER: |
77 return &(alloc_config_gen_player(media->buffer, media->size))->header; | |
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78 case SYSTEM_SEGACD: |
1692 | 79 return &(alloc_config_genesis_cdboot(media, opts, force_region))->header; |
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80 #ifndef NO_Z80 |
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81 case SYSTEM_SMS: |
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82 return &(alloc_configure_sms(media, opts, force_region))->header; |
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83 #endif |
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84 default: |
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85 return NULL; |
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86 } |
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87 } |
1946 | 88 |
89 system_header *alloc_config_player(system_type stype, event_reader *reader) | |
90 { | |
91 switch(stype) | |
92 { | |
93 case SYSTEM_GENESIS: | |
94 return &(alloc_config_gen_player_reader(reader))->header; | |
95 } | |
96 return NULL; | |
97 } | |
1980
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98 |
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99 void system_request_exit(system_header *system, uint8_t force_release) |
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100 { |
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101 system->force_release = force_release; |
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102 system->request_exit(system); |
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103 } |