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annotate system.c @ 2000:e45a317802bd

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Fix broken enum definitions that cause multiple definition errors when building with -fno-common which is now the default in GCC 10
author Mike Pavone <pavone@retrodev.com>
date Sat, 11 Jul 2020 21:16:32 -0700
parents 81df9aa2de9b
children 3414a4423de1
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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
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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: Differentiate between vanilla Genesis and Sega CD/32X games
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17 return SYSTEM_GENESIS;
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18 }
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19 if (safe_cmp("TMR SEGA", 0x1FF0, media->buffer, media->size)
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20 || safe_cmp("TMR SEGA", 0x3FF0, media->buffer, media->size)
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21 || safe_cmp("TMR SEGA", 0x7FF0, media->buffer, media->size)
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22 ) {
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23 return SYSTEM_SMS;
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24 }
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25 if (safe_cmp("BLSTEL\x02", 0, media->buffer, media->size)) {
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26 uint8_t *buffer = media->buffer;
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27 if (media->size > 9 && buffer[7] == 0) {
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28 return buffer[8] + 1;
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29 }
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30 }
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31
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32
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33 //TODO: Detect Jaguar ROMs here
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34
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35 //Header based detection failed, examine filename for clues
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36 if (media->extension) {
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37 if (!strcmp("md", media->extension) || !strcmp("gen", media->extension)) {
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38 return SYSTEM_GENESIS;
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39 }
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40 if (!strcmp("sms", media->extension)) {
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41 return SYSTEM_SMS;
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42 }
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43 if (!strcmp("j64", media->extension)) {
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44 return SYSTEM_JAGUAR;
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45 }
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46 }
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47
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48 //More certain checks failed, look for a valid 68K reset vector
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49 if (media->size >= 8) {
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50 char *rom = media->buffer;
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51 uint32_t reset = rom[5] << 16 | rom[6] << 8 | rom[7];
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52 if (!(reset & 1) && reset < media->size) {
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53 //we have a valid looking reset vector, assume it's a Genesis ROM
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54 return SYSTEM_GENESIS;
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55 }
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56 }
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57 return SYSTEM_UNKNOWN;
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58 }
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59
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60 system_header *alloc_config_system(system_type stype, system_media *media, uint32_t opts, uint8_t force_region)
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61 {
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62 void *lock_on = NULL;
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63 uint32_t lock_on_size = 0;
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64 if (media->chain) {
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65 lock_on = media->chain->buffer;
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66 lock_on_size = media->chain->size;
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67 }
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68 switch (stype)
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69 {
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70 case SYSTEM_GENESIS:
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71 return &(alloc_config_genesis(media->buffer, media->size, lock_on, lock_on_size, opts, force_region))->header;
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72 case SYSTEM_GENESIS_PLAYER:
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73 return &(alloc_config_gen_player(media->buffer, media->size))->header;
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74 #ifndef NO_Z80
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75 case SYSTEM_SMS:
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76 return &(alloc_configure_sms(media, opts, force_region))->header;
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77 #endif
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78 default:
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79 return NULL;
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80 }
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81 }
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82
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83 system_header *alloc_config_player(system_type stype, event_reader *reader)
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84 {
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85 switch(stype)
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86 {
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87 case SYSTEM_GENESIS:
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88 return &(alloc_config_gen_player_reader(reader))->header;
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89 }
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90 return NULL;
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91 }
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92
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93 void system_request_exit(system_header *system, uint8_t force_release)
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94 {
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95 system->force_release = force_release;
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96 system->request_exit(system);
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97 }