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annotate src/saveload.h @ 6853:735550a14c63 draft

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(svn r10093) -Revert: removed 16x zoom-out as it is broken beyond repair
author truelight <truelight@openttd.org>
date Mon, 11 Jun 2007 11:59:36 +0000 (2007-06-11)
parents f25c4cfd1893
children bb43858bed10
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1 /* $Id$ */
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2
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3 /** @file saveload.h */
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4
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5 #ifndef SAVELOAD_H
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6 #define SAVELOAD_H
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7
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8 #ifdef SIZE_MAX
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9 #undef SIZE_MAX
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10 #endif
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12 #define SIZE_MAX ((size_t)-1)
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14 enum SaveOrLoadResult {
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15 SL_OK = 0, ///< completed successfully
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16 SL_ERROR = 1, ///< error that was caught before internal structures were modified
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17 SL_REINIT = 2, ///< error that was caught in the middle of updating game state, need to clear it. (can only happen during load)
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18 };
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20 enum SaveOrLoadMode {
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21 SL_INVALID = -1,
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22 SL_LOAD = 0,
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23 SL_SAVE = 1,
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24 SL_OLD_LOAD = 2,
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25 SL_PNG = 3,
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26 SL_BMP = 4,
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27 };
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28
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29 SaveOrLoadResult SaveOrLoad(const char *filename, int mode);
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30 void WaitTillSaved();
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31 void DoExitSave();
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34 typedef void ChunkSaveLoadProc();
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35 typedef void AutolengthProc(void *arg);
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37 struct ChunkHandler {
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38 uint32 id;
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39 ChunkSaveLoadProc *save_proc;
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40 ChunkSaveLoadProc *load_proc;
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41 uint32 flags;
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42 };
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44 struct NullStruct {
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45 byte null;
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46 };
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48 enum SLRefType {
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49 REF_ORDER = 0,
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50 REF_VEHICLE = 1,
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51 REF_STATION = 2,
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52 REF_TOWN = 3,
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53 REF_VEHICLE_OLD = 4,
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54 REF_ROADSTOPS = 5,
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55 REF_ENGINE_RENEWS = 6,
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56 };
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57
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58 #define SL_MAX_VERSION 255
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59
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60 enum {
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61 INC_VEHICLE_COMMON = 0,
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62 };
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63
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64 enum {
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65 CH_RIFF = 0,
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66 CH_ARRAY = 1,
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67 CH_SPARSE_ARRAY = 2,
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68 CH_TYPE_MASK = 3,
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69 CH_LAST = 8,
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70 CH_AUTO_LENGTH = 16,
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71
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72 CH_PRI_0 = 0 << 4,
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73 CH_PRI_1 = 1 << 4,
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74 CH_PRI_2 = 2 << 4,
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75 CH_PRI_3 = 3 << 4,
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76 CH_PRI_SHL = 4,
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77 CH_NUM_PRI_LEVELS = 4,
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78 };
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79
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80 /** VarTypes is the general bitmasked magic type that tells us
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81 * certain characteristics about the variable it refers to. For example
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82 * SLE_FILE_* gives the size(type) as it would be in the savegame and
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83 * SLE_VAR_* the size(type) as it is in memory during runtime. These are
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84 * the first 8 bytes (0-3 SLE_FILE, 4-7 SLE_VAR).
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85 * Bytes 8-15 are reserved for various flags as explained below */
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86 enum VarTypes {
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87 /* 4 bytes allocated a maximum of 16 types for NumberType */
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88 SLE_FILE_I8 = 0,
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89 SLE_FILE_U8 = 1,
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90 SLE_FILE_I16 = 2,
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91 SLE_FILE_U16 = 3,
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92 SLE_FILE_I32 = 4,
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93 SLE_FILE_U32 = 5,
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94 SLE_FILE_I64 = 6,
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95 SLE_FILE_U64 = 7,
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96 SLE_FILE_STRINGID = 8, ///< StringID offset into strings-array
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97 SLE_FILE_STRING = 9,
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98 /* 6 more possible file-primitives */
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99
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100 /* 4 bytes allocated a maximum of 16 types for NumberType */
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101 SLE_VAR_BL = 0 << 4,
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102 SLE_VAR_I8 = 1 << 4,
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103 SLE_VAR_U8 = 2 << 4,
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104 SLE_VAR_I16 = 3 << 4,
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105 SLE_VAR_U16 = 4 << 4,
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106 SLE_VAR_I32 = 5 << 4,
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107 SLE_VAR_U32 = 6 << 4,
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108 SLE_VAR_I64 = 7 << 4,
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109 SLE_VAR_U64 = 8 << 4,
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110 SLE_VAR_NULL = 9 << 4, ///< useful to write zeros in savegame.
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111 SLE_VAR_STRB = 10 << 4, ///< string (with pre-allocated buffer)
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112 SLE_VAR_STRBQ = 11 << 4, ///< string enclosed in quotes (with pre-allocated buffer)
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113 SLE_VAR_STR = 12 << 4, ///< string pointer
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114 SLE_VAR_STRQ = 13 << 4, ///< string pointer enclosed in quotes
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115 /* 2 more possible memory-primitives */
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116
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117 /* Shortcut values */
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118 SLE_VAR_CHAR = SLE_VAR_I8,
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119
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120 /* Default combinations of variables. As savegames change, so can variables
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121 * and thus it is possible that the saved value and internal size do not
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122 * match and you need to specify custom combo. The defaults are listed here */
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123 SLE_BOOL = SLE_FILE_I8 | SLE_VAR_BL,
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124 SLE_INT8 = SLE_FILE_I8 | SLE_VAR_I8,
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125 SLE_UINT8 = SLE_FILE_U8 | SLE_VAR_U8,
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126 SLE_INT16 = SLE_FILE_I16 | SLE_VAR_I16,
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127 SLE_UINT16 = SLE_FILE_U16 | SLE_VAR_U16,
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128 SLE_INT32 = SLE_FILE_I32 | SLE_VAR_I32,
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129 SLE_UINT32 = SLE_FILE_U32 | SLE_VAR_U32,
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130 SLE_INT64 = SLE_FILE_I64 | SLE_VAR_I64,
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131 SLE_UINT64 = SLE_FILE_U64 | SLE_VAR_U64,
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132 SLE_CHAR = SLE_FILE_I8 | SLE_VAR_CHAR,
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133 SLE_STRINGID = SLE_FILE_STRINGID | SLE_VAR_U16,
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134 SLE_STRINGBUF = SLE_FILE_STRING | SLE_VAR_STRB,
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135 SLE_STRINGBQUOTE = SLE_FILE_STRING | SLE_VAR_STRBQ,
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136 SLE_STRING = SLE_FILE_STRING | SLE_VAR_STR,
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137 SLE_STRINGQUOTE = SLE_FILE_STRING | SLE_VAR_STRQ,
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138
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139 /* Shortcut values */
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140 SLE_UINT = SLE_UINT32,
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141 SLE_INT = SLE_INT32,
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142 SLE_STRB = SLE_STRINGBUF,
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143 SLE_STRBQ = SLE_STRINGBQUOTE,
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144 SLE_STR = SLE_STRING,
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145 SLE_STRQ = SLE_STRINGQUOTE,
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146
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147 /* 8 bytes allocated for a maximum of 8 flags
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148 * Flags directing saving/loading of a variable */
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149 SLF_SAVE_NO = 1 << 8, ///< do not save with savegame, basically player-based
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150 SLF_CONFIG_NO = 1 << 9, ///< do not save to config file
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151 SLF_NETWORK_NO = 1 << 10, ///< do not synchronize over network (but it is saved if SSF_SAVE_NO is not set)
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152 /* 5 more possible flags */
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153 };
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154
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155 typedef uint32 VarType;
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156
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157 enum SaveLoadTypes {
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158 SL_VAR = 0,
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159 SL_REF = 1,
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160 SL_ARR = 2,
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161 SL_STR = 3,
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162 SL_LST = 4,
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163 // non-normal save-load types
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164 SL_WRITEBYTE = 8,
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165 SL_INCLUDE = 9,
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166 SL_END = 15
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167 };
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168
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169 typedef byte SaveLoadType;
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170
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171 /** SaveLoad type struct. Do NOT use this directly but use the SLE_ macros defined just below! */
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172 struct SaveLoad {
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173 SaveLoadType cmd; ///< the action to take with the saved/loaded type, All types need different action
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174 VarType conv; ///< type of the variable to be saved, int
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175 uint16 length; ///< (conditional) length of the variable (eg. arrays) (max array size is 65536 elements)
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176 uint16 version_from; ///< save/load the variable starting from this savegame version
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177 uint16 version_to; ///< save/load the variable until this savegame version
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178 /* NOTE: This element either denotes the address of the variable for a global
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179 * variable, or the offset within a struct which is then bound to a variable
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180 * during runtime. Decision on which one to use is controlled by the function
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181 * that is called to save it. address: SlGlobList, offset: SlObject */
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182 void *address; ///< address of variable OR offset of variable in the struct (max offset is 65536)
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183 };
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184
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185 /* Same as SaveLoad but global variables are used (for better readability); */
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186 typedef SaveLoad SaveLoadGlobVarList;
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187
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188 /* Simple variables, references (pointers) and arrays */
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189 #define SLE_GENERAL(cmd, base, variable, type, length, from, to) {cmd, type, length, from, to, (void*)cpp_offsetof(base, variable)}
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190 #define SLE_CONDVAR(base, variable, type, from, to) SLE_GENERAL(SL_VAR, base, variable, type, 0, from, to)
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191 #define SLE_CONDREF(base, variable, type, from, to) SLE_GENERAL(SL_REF, base, variable, type, 0, from, to)
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192 #define SLE_CONDARR(base, variable, type, length, from, to) SLE_GENERAL(SL_ARR, base, variable, type, length, from, to)
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193 #define SLE_CONDSTR(base, variable, type, length, from, to) SLE_GENERAL(SL_STR, base, variable, type, length, from, to)
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194 #define SLE_CONDLST(base, variable, type, from, to) SLE_GENERAL(SL_LST, base, variable, type, 0, from, to)
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195
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196 #define SLE_VAR(base, variable, type) SLE_CONDVAR(base, variable, type, 0, SL_MAX_VERSION)
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197 #define SLE_REF(base, variable, type) SLE_CONDREF(base, variable, type, 0, SL_MAX_VERSION)
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198 #define SLE_ARR(base, variable, type, length) SLE_CONDARR(base, variable, type, length, 0, SL_MAX_VERSION)
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199 #define SLE_STR(base, variable, type, length) SLE_CONDSTR(base, variable, type, length, 0, SL_MAX_VERSION)
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200 #define SLE_LST(base, variable, type) SLE_CONDLST(base, variable, type, 0, SL_MAX_VERSION)
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201
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202 #define SLE_CONDNULL(length, from, to) SLE_CONDARR(NullStruct, null, SLE_FILE_U8 | SLE_VAR_NULL | SLF_CONFIG_NO, length, from, to)
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203
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204 /* Translate values ingame to different values in the savegame and vv */
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205 #define SLE_WRITEBYTE(base, variable, value) SLE_GENERAL(SL_WRITEBYTE, base, variable, 0, 0, value, value)
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206 /* Load common code and put it into each struct (currently only for vehicles */
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207 #define SLE_INCLUDE(base, variable, include_index) SLE_GENERAL(SL_INCLUDE, base, variable, 0, 0, include_index, 0)
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208
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209 /* The same as the ones at the top, only the offset is given directly; used for unions */
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210 #define SLE_GENERALX(cmd, offset, type, param1, param2) {cmd, type, 0, param1, param2, (void*)(offset)}
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211 #define SLE_CONDVARX(offset, type, from, to) SLE_GENERALX(SL_VAR, offset, type, from, to)
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212 #define SLE_CONDREFX(offset, type, from, to) SLE_GENERALX(SL_REF, offset, type, from, to)
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213
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214 #define SLE_VARX(offset, type) SLE_CONDVARX(offset, type, 0, SL_MAX_VERSION)
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215 #define SLE_REFX(offset, type) SLE_CONDREFX(offset, type, 0, SL_MAX_VERSION)
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216
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217 #define SLE_WRITEBYTEX(offset, something) SLE_GENERALX(SL_WRITEBYTE, offset, 0, something, 0)
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218 #define SLE_INCLUDEX(offset, type) SLE_GENERALX(SL_INCLUDE, offset, type, 0, SL_MAX_VERSION)
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219
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220 /* End marker */
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221 #define SLE_END() {SL_END, 0, 0, 0, 0, NULL}
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222
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223 /* Simple variables, references (pointers) and arrays, but for global variables */
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224 #define SLEG_GENERAL(cmd, variable, type, length, from, to) {cmd, type, length, from, to, (void*)&variable}
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225
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226 #define SLEG_CONDVAR(variable, type, from, to) SLEG_GENERAL(SL_VAR, variable, type, 0, from, to)
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227 #define SLEG_CONDREF(variable, type, from, to) SLEG_GENERAL(SL_REF, variable, type, 0, from, to)
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228 #define SLEG_CONDARR(variable, type, length, from, to) SLEG_GENERAL(SL_ARR, variable, type, length, from, to)
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229 #define SLEG_CONDSTR(variable, type, length, from, to) SLEG_GENERAL(SL_STR, variable, type, length, from, to)
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230 #define SLEG_CONDLST(variable, type, from, to) SLEG_GENERAL(SL_LST, variable, type, 0, from, to)
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231
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232 #define SLEG_VAR(variable, type) SLEG_CONDVAR(variable, type, 0, SL_MAX_VERSION)
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233 #define SLEG_REF(variable, type) SLEG_CONDREF(variable, type, 0, SL_MAX_VERSION)
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234 #define SLEG_ARR(variable, type) SLEG_CONDARR(variable, type, lengthof(variable), 0, SL_MAX_VERSION)
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235 #define SLEG_STR(variable, type) SLEG_CONDSTR(variable, type, lengthof(variable), 0, SL_MAX_VERSION)
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236 #define SLEG_LST(variable, type) SLEG_CONDLST(variable, type, 0, SL_MAX_VERSION)
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237
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238 #define SLEG_CONDNULL(length, from, to) {SL_ARR, SLE_FILE_U8 | SLE_VAR_NULL | SLF_CONFIG_NO, length, from, to, (void*)NULL}
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239
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240 #define SLEG_END() {SL_END, 0, 0, 0, 0, NULL}
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241
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242 /** Checks if the savegame is below major.minor.
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243 */
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244 static inline bool CheckSavegameVersionOldStyle(uint16 major, byte minor)
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245 {
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246 extern uint16 _sl_version;
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247 extern byte _sl_minor_version;
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248 return (_sl_version < major) || (_sl_version == major && _sl_minor_version < minor);
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249 }
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250
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251 /** Checks if the savegame is below version.
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252 */
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253 static inline bool CheckSavegameVersion(uint16 version)
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254 {
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255 extern uint16 _sl_version;
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256 return _sl_version < version;
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257 }
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258
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259 /** Checks if some version from/to combination falls within the range of the
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260 * active savegame version */
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261 static inline bool SlIsObjectCurrentlyValid(uint16 version_from, uint16 version_to)
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262 {
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263 extern const uint16 SAVEGAME_VERSION;
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264 if (SAVEGAME_VERSION < version_from || SAVEGAME_VERSION > version_to) return false;
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265
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266 return true;
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267 }
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268
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269 /* Get the NumberType of a setting. This describes the integer type
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270 * as it is represented in memory
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271 * @param type VarType holding information about the variable-type
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272 * @return return the SLE_VAR_* part of a variable-type description */
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273 static inline VarType GetVarMemType(VarType type)
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274 {
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275 return type & 0xF0; // GB(type, 4, 4) << 4;
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276 }
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277
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278 /* Get the FileType of a setting. This describes the integer type
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279 * as it is represented in a savegame/file
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280 * @param type VarType holding information about the variable-type
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281 * @param return the SLE_FILE_* part of a variable-type description */
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282 static inline VarType GetVarFileType(VarType type)
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283 {
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284 return type & 0xF; // GB(type, 0, 4);
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285 }
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286
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287 /** Get the address of the variable. Which one to pick depends on the object
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288 * pointer. If it is NULL we are dealing with global variables so the address
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289 * is taken. If non-null only the offset is stored in the union and we need
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290 * to add this to the address of the object */
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291 static inline void *GetVariableAddress(const void *object, const SaveLoad *sld)
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292 {
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293 return (byte*)object + (ptrdiff_t)sld->address;
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294 }
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295
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296 int64 ReadValue(const void *ptr, VarType conv);
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297 void WriteValue(void *ptr, VarType conv, int64 val);
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298
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299 void SlSetArrayIndex(uint index);
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300 int SlIterateArray();
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301
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302 void SlAutolength(AutolengthProc *proc, void *arg);
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303 uint SlGetFieldLength();
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304 void SlSetLength(size_t length);
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305 size_t SlCalcObjMemberLength(const void *object, const SaveLoad *sld);
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306
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307 byte SlReadByte();
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308 void SlWriteByte(byte b);
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309
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310 void SlGlobList(const SaveLoadGlobVarList *sldg);
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311 void SlArray(void *array, uint length, VarType conv);
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312 void SlObject(void *object, const SaveLoad *sld);
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313 bool SlObjectMember(void *object, const SaveLoad *sld);
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314
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315 void SaveFileStart();
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316 void SaveFileDone();
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317 void SaveFileError();
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318 #endif /* SAVELOAD_H */