saveload.h

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00001 /* $Id$ */
00002 
00003 /*
00004  * This file is part of OpenTTD.
00005  * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
00006  * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
00007  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
00008  */
00009 
00012 #ifndef SAVELOAD_H
00013 #define SAVELOAD_H
00014 
00015 #include "../fileio_type.h"
00016 
00017 #ifdef SIZE_MAX
00018 #undef SIZE_MAX
00019 #endif
00020 
00021 #define SIZE_MAX ((size_t)-1)
00022 
00024 enum SaveOrLoadResult {
00025   SL_OK     = 0, 
00026   SL_ERROR  = 1, 
00027   SL_REINIT = 2, 
00028 };
00029 
00031 enum SaveOrLoadMode {
00032   SL_INVALID    = -1, 
00033   SL_LOAD       =  0, 
00034   SL_SAVE       =  1, 
00035   SL_OLD_LOAD   =  2, 
00036   SL_PNG        =  3, 
00037   SL_BMP        =  4, 
00038   SL_LOAD_CHECK =  5, 
00039 };
00040 
00042 enum SavegameType {
00043   SGT_TTD,    
00044   SGT_TTDP1,  
00045   SGT_TTDP2,  
00046   SGT_OTTD,   
00047   SGT_TTO,    
00048   SGT_INVALID = 0xFF 
00049 };
00050 
00051 void GenerateDefaultSaveName(char *buf, const char *last);
00052 void SetSaveLoadError(uint16 str);
00053 const char *GetSaveLoadErrorString();
00054 SaveOrLoadResult SaveOrLoad(const char *filename, int mode, Subdirectory sb, bool threaded = true);
00055 void WaitTillSaved();
00056 void DoExitSave();
00057 
00058 SaveOrLoadResult SaveWithFilter(struct SaveFilter *writer, bool threaded);
00059 SaveOrLoadResult LoadWithFilter(struct LoadFilter *reader);
00060 
00061 typedef void ChunkSaveLoadProc();
00062 typedef void AutolengthProc(void *arg);
00063 
00065 struct ChunkHandler {
00066   uint32 id;                          
00067   ChunkSaveLoadProc *save_proc;       
00068   ChunkSaveLoadProc *load_proc;       
00069   ChunkSaveLoadProc *ptrs_proc;       
00070   ChunkSaveLoadProc *load_check_proc; 
00071   uint32 flags;                       
00072 };
00073 
00074 struct NullStruct {
00075   byte null;
00076 };
00077 
00079 enum SLRefType {
00080   REF_ORDER         = 0, 
00081   REF_VEHICLE       = 1, 
00082   REF_STATION       = 2, 
00083   REF_TOWN          = 3, 
00084   REF_VEHICLE_OLD   = 4, 
00085   REF_ROADSTOPS     = 5, 
00086   REF_ENGINE_RENEWS = 6, 
00087   REF_CARGO_PACKET  = 7, 
00088   REF_ORDERLIST     = 8, 
00089 };
00090 
00092 #define SL_MAX_VERSION 255
00093 
00095 enum ChunkType {
00096   CH_RIFF         =  0,
00097   CH_ARRAY        =  1,
00098   CH_SPARSE_ARRAY =  2,
00099   CH_TYPE_MASK    =  3,
00100   CH_LAST         =  8, 
00101   CH_AUTO_LENGTH  = 16,
00102 };
00103 
00112 enum VarTypes {
00113   /* 4 bits allocated a maximum of 16 types for NumberType */
00114   SLE_FILE_I8       = 0,
00115   SLE_FILE_U8       = 1,
00116   SLE_FILE_I16      = 2,
00117   SLE_FILE_U16      = 3,
00118   SLE_FILE_I32      = 4,
00119   SLE_FILE_U32      = 5,
00120   SLE_FILE_I64      = 6,
00121   SLE_FILE_U64      = 7,
00122   SLE_FILE_STRINGID = 8, 
00123   SLE_FILE_STRING   = 9,
00124   /* 6 more possible file-primitives */
00125 
00126   /* 4 bits allocated a maximum of 16 types for NumberType */
00127   SLE_VAR_BL    =  0 << 4,
00128   SLE_VAR_I8    =  1 << 4,
00129   SLE_VAR_U8    =  2 << 4,
00130   SLE_VAR_I16   =  3 << 4,
00131   SLE_VAR_U16   =  4 << 4,
00132   SLE_VAR_I32   =  5 << 4,
00133   SLE_VAR_U32   =  6 << 4,
00134   SLE_VAR_I64   =  7 << 4,
00135   SLE_VAR_U64   =  8 << 4,
00136   SLE_VAR_NULL  =  9 << 4, 
00137   SLE_VAR_STRB  = 10 << 4, 
00138   SLE_VAR_STRBQ = 11 << 4, 
00139   SLE_VAR_STR   = 12 << 4, 
00140   SLE_VAR_STRQ  = 13 << 4, 
00141   SLE_VAR_NAME  = 14 << 4, 
00142   /* 1 more possible memory-primitives */
00143 
00144   /* Shortcut values */
00145   SLE_VAR_CHAR = SLE_VAR_I8,
00146 
00147   /* Default combinations of variables. As savegames change, so can variables
00148    * and thus it is possible that the saved value and internal size do not
00149    * match and you need to specify custom combo. The defaults are listed here */
00150   SLE_BOOL         = SLE_FILE_I8  | SLE_VAR_BL,
00151   SLE_INT8         = SLE_FILE_I8  | SLE_VAR_I8,
00152   SLE_UINT8        = SLE_FILE_U8  | SLE_VAR_U8,
00153   SLE_INT16        = SLE_FILE_I16 | SLE_VAR_I16,
00154   SLE_UINT16       = SLE_FILE_U16 | SLE_VAR_U16,
00155   SLE_INT32        = SLE_FILE_I32 | SLE_VAR_I32,
00156   SLE_UINT32       = SLE_FILE_U32 | SLE_VAR_U32,
00157   SLE_INT64        = SLE_FILE_I64 | SLE_VAR_I64,
00158   SLE_UINT64       = SLE_FILE_U64 | SLE_VAR_U64,
00159   SLE_CHAR         = SLE_FILE_I8  | SLE_VAR_CHAR,
00160   SLE_STRINGID     = SLE_FILE_STRINGID | SLE_VAR_U16,
00161   SLE_STRINGBUF    = SLE_FILE_STRING   | SLE_VAR_STRB,
00162   SLE_STRINGBQUOTE = SLE_FILE_STRING   | SLE_VAR_STRBQ,
00163   SLE_STRING       = SLE_FILE_STRING   | SLE_VAR_STR,
00164   SLE_STRINGQUOTE  = SLE_FILE_STRING   | SLE_VAR_STRQ,
00165   SLE_NAME         = SLE_FILE_STRINGID | SLE_VAR_NAME,
00166 
00167   /* Shortcut values */
00168   SLE_UINT  = SLE_UINT32,
00169   SLE_INT   = SLE_INT32,
00170   SLE_STRB  = SLE_STRINGBUF,
00171   SLE_STRBQ = SLE_STRINGBQUOTE,
00172   SLE_STR   = SLE_STRING,
00173   SLE_STRQ  = SLE_STRINGQUOTE,
00174 
00175   /* 8 bits allocated for a maximum of 8 flags
00176    * Flags directing saving/loading of a variable */
00177   SLF_SAVE_NO      = 1 <<  8, 
00178   SLF_CONFIG_NO    = 1 <<  9, 
00179   SLF_NETWORK_NO   = 1 << 10, 
00180   /* 5 more possible flags */
00181 };
00182 
00183 typedef uint32 VarType;
00184 
00186 enum SaveLoadTypes {
00187   SL_VAR         =  0, 
00188   SL_REF         =  1, 
00189   SL_ARR         =  2, 
00190   SL_STR         =  3, 
00191   SL_LST         =  4, 
00192   /* non-normal save-load types */
00193   SL_WRITEBYTE   =  8,
00194   SL_VEH_INCLUDE =  9,
00195   SL_ST_INCLUDE  = 10,
00196   SL_END         = 15
00197 };
00198 
00199 typedef byte SaveLoadType; 
00200 
00202 struct SaveLoad {
00203   bool global;         
00204   SaveLoadType cmd;    
00205   VarType conv;        
00206   uint16 length;       
00207   uint16 version_from; 
00208   uint16 version_to;   
00209   /* NOTE: This element either denotes the address of the variable for a global
00210    * variable, or the offset within a struct which is then bound to a variable
00211    * during runtime. Decision on which one to use is controlled by the function
00212    * that is called to save it. address: global=true, offset: global=false */
00213   void *address;       
00214 };
00215 
00217 typedef SaveLoad SaveLoadGlobVarList;
00218 
00229 #define SLE_GENERAL(cmd, base, variable, type, length, from, to) {false, cmd, type, length, from, to, (void*)cpp_offsetof(base, variable)}
00230 
00239 #define SLE_CONDVAR(base, variable, type, from, to) SLE_GENERAL(SL_VAR, base, variable, type, 0, from, to)
00240 
00249 #define SLE_CONDREF(base, variable, type, from, to) SLE_GENERAL(SL_REF, base, variable, type, 0, from, to)
00250 
00260 #define SLE_CONDARR(base, variable, type, length, from, to) SLE_GENERAL(SL_ARR, base, variable, type, length, from, to)
00261 
00271 #define SLE_CONDSTR(base, variable, type, length, from, to) SLE_GENERAL(SL_STR, base, variable, type, length, from, to)
00272 
00281 #define SLE_CONDLST(base, variable, type, from, to) SLE_GENERAL(SL_LST, base, variable, type, 0, from, to)
00282 
00289 #define SLE_VAR(base, variable, type) SLE_CONDVAR(base, variable, type, 0, SL_MAX_VERSION)
00290 
00297 #define SLE_REF(base, variable, type) SLE_CONDREF(base, variable, type, 0, SL_MAX_VERSION)
00298 
00306 #define SLE_ARR(base, variable, type, length) SLE_CONDARR(base, variable, type, length, 0, SL_MAX_VERSION)
00307 
00315 #define SLE_STR(base, variable, type, length) SLE_CONDSTR(base, variable, type, length, 0, SL_MAX_VERSION)
00316 
00323 #define SLE_LST(base, variable, type) SLE_CONDLST(base, variable, type, 0, SL_MAX_VERSION)
00324 
00329 #define SLE_NULL(length) SLE_CONDNULL(length, 0, SL_MAX_VERSION)
00330 
00337 #define SLE_CONDNULL(length, from, to) SLE_CONDARR(NullStruct, null, SLE_FILE_U8 | SLE_VAR_NULL | SLF_CONFIG_NO, length, from, to)
00338 
00340 #define SLE_WRITEBYTE(base, variable, value) SLE_GENERAL(SL_WRITEBYTE, base, variable, 0, 0, value, value)
00341 
00342 #define SLE_VEH_INCLUDE() {false, SL_VEH_INCLUDE, 0, 0, 0, SL_MAX_VERSION, NULL}
00343 #define SLE_ST_INCLUDE() {false, SL_ST_INCLUDE, 0, 0, 0, SL_MAX_VERSION, NULL}
00344 
00346 #define SLE_END() {false, SL_END, 0, 0, 0, 0, NULL}
00347 
00357 #define SLEG_GENERAL(cmd, variable, type, length, from, to) {true, cmd, type, length, from, to, (void*)&variable}
00358 
00366 #define SLEG_CONDVAR(variable, type, from, to) SLEG_GENERAL(SL_VAR, variable, type, 0, from, to)
00367 
00375 #define SLEG_CONDREF(variable, type, from, to) SLEG_GENERAL(SL_REF, variable, type, 0, from, to)
00376 
00385 #define SLEG_CONDARR(variable, type, length, from, to) SLEG_GENERAL(SL_ARR, variable, type, length, from, to)
00386 
00395 #define SLEG_CONDSTR(variable, type, length, from, to) SLEG_GENERAL(SL_STR, variable, type, length, from, to)
00396 
00404 #define SLEG_CONDLST(variable, type, from, to) SLEG_GENERAL(SL_LST, variable, type, 0, from, to)
00405 
00411 #define SLEG_VAR(variable, type) SLEG_CONDVAR(variable, type, 0, SL_MAX_VERSION)
00412 
00418 #define SLEG_REF(variable, type) SLEG_CONDREF(variable, type, 0, SL_MAX_VERSION)
00419 
00425 #define SLEG_ARR(variable, type) SLEG_CONDARR(variable, type, lengthof(variable), 0, SL_MAX_VERSION)
00426 
00432 #define SLEG_STR(variable, type) SLEG_CONDSTR(variable, type, lengthof(variable), 0, SL_MAX_VERSION)
00433 
00439 #define SLEG_LST(variable, type) SLEG_CONDLST(variable, type, 0, SL_MAX_VERSION)
00440 
00447 #define SLEG_CONDNULL(length, from, to) {true, SL_ARR, SLE_FILE_U8 | SLE_VAR_NULL | SLF_CONFIG_NO, length, from, to, (void*)NULL}
00448 
00450 #define SLEG_END() {true, SL_END, 0, 0, 0, 0, NULL}
00451 
00458 static inline bool IsSavegameVersionBefore(uint16 major, byte minor = 0)
00459 {
00460   extern uint16 _sl_version;
00461   extern byte   _sl_minor_version;
00462   return _sl_version < major || (minor > 0 && _sl_version == major && _sl_minor_version < minor);
00463 }
00464 
00472 static inline bool SlIsObjectCurrentlyValid(uint16 version_from, uint16 version_to)
00473 {
00474   extern const uint16 SAVEGAME_VERSION;
00475   if (SAVEGAME_VERSION < version_from || SAVEGAME_VERSION > version_to) return false;
00476 
00477   return true;
00478 }
00479 
00486 static inline VarType GetVarMemType(VarType type)
00487 {
00488   return type & 0xF0; // GB(type, 4, 4) << 4;
00489 }
00490 
00497 static inline VarType GetVarFileType(VarType type)
00498 {
00499   return type & 0xF; // GB(type, 0, 4);
00500 }
00501 
00507 static inline bool IsNumericType(VarType conv)
00508 {
00509   return GetVarMemType(conv) <= SLE_VAR_U64;
00510 }
00511 
00518 static inline void *GetVariableAddress(const void *object, const SaveLoad *sld)
00519 {
00520   return (byte*)(sld->global ? NULL : object) + (ptrdiff_t)sld->address;
00521 }
00522 
00523 int64 ReadValue(const void *ptr, VarType conv);
00524 void WriteValue(void *ptr, VarType conv, int64 val);
00525 
00526 void SlSetArrayIndex(uint index);
00527 int SlIterateArray();
00528 
00529 void SlAutolength(AutolengthProc *proc, void *arg);
00530 size_t SlGetFieldLength();
00531 void SlSetLength(size_t length);
00532 size_t SlCalcObjMemberLength(const void *object, const SaveLoad *sld);
00533 size_t SlCalcObjLength(const void *object, const SaveLoad *sld);
00534 
00535 byte SlReadByte();
00536 void SlWriteByte(byte b);
00537 
00538 void SlGlobList(const SaveLoadGlobVarList *sldg);
00539 void SlArray(void *array, size_t length, VarType conv);
00540 void SlObject(void *object, const SaveLoad *sld);
00541 bool SlObjectMember(void *object, const SaveLoad *sld);
00542 void NORETURN SlErrorCorrupt(const char *msg);
00543 
00544 bool SaveloadCrashWithMissingNewGRFs();
00545 
00546 extern char _savegame_format[8];
00547 extern bool _do_autosave;
00548 
00549 #endif /* SAVELOAD_H */

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