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annotate romdb.c @ 765:dc54387ee1cd

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Allow regions to be set in ROM DB. Prefer default region if it is one of the valid regions for the ROM.
author Michael Pavone <pavone@retrodev.com>
date Thu, 02 Jul 2015 20:43:01 -0700
parents bb60259e8edf
children 1b2f8280ba81
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764
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1 #include <stdlib.h>
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2 #include <string.h>
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3 #include "config.h"
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4 #include "romdb.h"
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5 #include "util.h"
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6
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7 #define TITLE_START 0x150
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8 #define TITLE_END (TITLE_START+48)
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9 #define GAME_ID_OFF 0x183
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10 #define GAME_ID_LEN 8
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11 #define REGION_START 0x1F0
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12
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13 tern_node *load_rom_db()
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14 {
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15 char *exe_dir = get_exe_dir();
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16 if (!exe_dir) {
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17 fputs("Failed to find executable path\n", stderr);
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18 exit(1);
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19 }
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20 char *path = alloc_concat(exe_dir, "/rom.db");
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21 tern_node *db = parse_config_file(path);
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22 free(path);
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23 if (!db) {
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24 fputs("Failed to load ROM DB\n", stderr);
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25 }
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26 return db;
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27 }
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28
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29 char *get_header_name(uint8_t *rom)
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30 {
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31 uint8_t *last = rom + TITLE_END - 1;
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32 uint8_t *src = rom + TITLE_START;
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33
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34 while (last > src && (*last <= 0x20 || *last >= 0x80))
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35 {
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36 last--;
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37 }
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38 if (last == src) {
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39 //TODO: Use other name field
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40 return strdup("UNKNOWN");
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41 } else {
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42 last++;
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43 char *ret = malloc(last - (rom + TITLE_START) + 1);
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44 uint8_t *dst;
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45 for (dst = ret; src < last; src++)
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46 {
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47 if (*src >= 0x20 && *src < 0x80) {
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48 *(dst++) = *src;
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49 }
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50 }
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51 *dst = 0;
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52 return ret;
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53 }
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54 }
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55
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56 char *region_chars = "UB4JEA";
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57 uint8_t region_bits[] = {REGION_U, REGION_U, REGION_U, REGION_J, REGION_E, REGION_E};
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58
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59 uint8_t translate_region_char(uint8_t c)
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60 {
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61 for (int i = 0; i < sizeof(region_bits); i++)
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62 {
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63 if (c == region_chars[i]) {
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64 return region_bits[i];
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65 }
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66 }
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67 return 0;
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68 }
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69
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70 uint8_t get_header_regions(uint8_t *rom)
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71 {
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72 uint8_t regions = 0;
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73 for (int i = 0; i < 3; i++)
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74 {
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75 regions |= translate_region_char(rom[REGION_START + i]);
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76 }
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77 return regions;
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78 }
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79
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80
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81 rom_info configure_rom_heuristics(uint8_t *rom)
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82 {
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83 rom_info info;
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84 info.name = get_header_name(rom);
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85 info.regions = get_header_regions(rom);
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86 return info;
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87 }
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88
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89 rom_info configure_rom(tern_node *rom_db, void *vrom)
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90 {
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91 uint8_t product_id[GAME_ID_LEN+1];
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92 uint8_t *rom = vrom;
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93 product_id[GAME_ID_LEN] = 0;
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94 for (int i = 0; i < GAME_ID_LEN; i++)
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95 {
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96 if (rom[GAME_ID_OFF + i] <= ' ') {
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97 product_id[i] = 0;
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98 break;
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99 }
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100 product_id[i] = rom[GAME_ID_OFF + i];
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101
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102 }
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103 tern_node * entry = tern_find_prefix(rom_db, product_id);
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104 if (!entry) {
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105 return configure_rom_heuristics(rom);
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106 }
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107 rom_info info;
765
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108 info.name = tern_find_ptr(entry, "name");
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109 if (info.name) {
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110 info.name = strdup(info.name);
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111 } else {
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112 info.name = get_header_name(rom);
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113 }
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114
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115 char *dbreg = tern_find_ptr(entry, "regions");
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116 info.regions = 0;
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117 if (dbreg) {
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118 while (*dbreg != 0)
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119 {
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120 info.regions |= translate_region_char(*(dbreg++));
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121 }
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122 }
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123 if (!info.regions) {
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124 info.regions = get_header_regions(rom);
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125 }
764
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126 return info;
765
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127 }