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/* $Id$ */
#ifndef SAVELOAD_H
#define SAVELOAD_H
#include <setjmp.h>
typedef enum SaveOrLoadResult {
SL_OK = 0, // completed successfully
SL_ERROR = 1, // error that was caught before internal structures were modified
SL_REINIT = 2, // error that was caught in the middle of updating game state, need to clear it. (can only happen during load)
} SaveOrLoadResult;
typedef enum SaveOrLoadMode {
SL_INVALID = -1,
SL_LOAD = 0,
SL_SAVE = 1,
SL_OLD_LOAD = 2,
} SaveOrLoadMode;
SaveOrLoadResult SaveOrLoad(const char *filename, int mode);
typedef void ChunkSaveLoadProc(void);
typedef void AutolengthProc(void *arg);
typedef struct SaveLoadGlobVarList {
void *address;
byte conv;
byte from_version;
byte to_version;
} SaveLoadGlobVarList;
typedef struct {
uint32 id;
ChunkSaveLoadProc *save_proc;
ChunkSaveLoadProc *load_proc;
uint32 flags;
} ChunkHandler;
typedef struct {
byte null;
} NullStruct;
typedef void WriterProc(uint len);
typedef uint ReaderProc(void);
typedef enum SLRefType {
REF_ORDER = 0,
REF_VEHICLE = 1,
REF_STATION = 2,
REF_TOWN = 3,
REF_VEHICLE_OLD = 4,
REF_ROADSTOPS = 5
} SLRefType;
typedef uint ReferenceToIntProc(const void *obj, SLRefType rt);
typedef void *IntToReferenceProc(uint index, SLRefType rt);
typedef struct SaveLoad SaveLoad;
/** The saveload struct, containing reader-writer functions, bufffer, version, etc. */
typedef struct {
bool save; /// are we doing a save or a load atm. True when saving
byte need_length; /// ???
byte block_mode; /// ???
bool error; /// did an error occur or not
byte version; /// the major savegame version identifier
uint16 full_version; /// the full version of the savegame
int obj_len; /// the length of the current object we are busy with
int array_index, last_array_index; /// in the case of an array, the current and last positions
uint32 offs_base; /// the offset in number of bytes since we started writing data (eg uncompressed savegame size)
WriterProc *write_bytes; /// savegame writer function
ReaderProc *read_bytes; /// savegame loader function
ReferenceToIntProc *ref_to_int_proc; /// function to convert pointers to numbers when saving a game
IntToReferenceProc *int_to_ref_proc; /// function to convert numbers to pointers when loading a game
const ChunkHandler* const *chs; /// the chunk of data that is being processed atm (vehicles, signs, etc.)
const SaveLoad* const *includes; /// the internal layouf of the given chunk
/** When saving/loading savegames, they are always saved to a temporary memory-place
* to be flushed to file (save) or to final place (load) when full. */
byte *bufp, *bufe; /// bufp(ointer) gives the current position in the buffer bufe(nd) gives the end of the buffer
// these 3 may be used by compressor/decompressors.
byte *buf; /// pointer to temporary memory to read/write, initialized by SaveLoadFormat->initread/write
uint bufsize; /// the size of the temporary memory *buf
FILE *fh; /// the file from which is read or written to
void (*excpt_uninit)(void); /// the function to execute on any encountered error
const char *excpt_msg; /// the error message
jmp_buf excpt; /// @todo used to jump to "exception handler"; really ugly
} SaverLoader;
extern SaverLoader _sl;
enum {
INC_VEHICLE_COMMON = 0,
};
enum {
CH_RIFF = 0,
CH_ARRAY = 1,
CH_SPARSE_ARRAY = 2,
CH_TYPE_MASK = 3,
CH_LAST = 8,
CH_AUTO_LENGTH = 16,
CH_PRI_0 = 0 << 4,
CH_PRI_1 = 1 << 4,
CH_PRI_2 = 2 << 4,
CH_PRI_3 = 3 << 4,
CH_PRI_SHL = 4,
CH_NUM_PRI_LEVELS = 4,
};
typedef enum VarTypes {
SLE_FILE_I8 = 0,
SLE_FILE_U8 = 1,
SLE_FILE_I16 = 2,
SLE_FILE_U16 = 3,
SLE_FILE_I32 = 4,
SLE_FILE_U32 = 5,
SLE_FILE_I64 = 6,
SLE_FILE_U64 = 7,
SLE_FILE_STRINGID = 8,
// SLE_FILE_IVAR = 8,
// SLE_FILE_UVAR = 9,
SLE_VAR_I8 = 0 << 4,
SLE_VAR_U8 = 1 << 4,
SLE_VAR_I16 = 2 << 4,
SLE_VAR_U16 = 3 << 4,
SLE_VAR_I32 = 4 << 4,
SLE_VAR_U32 = 5 << 4,
SLE_VAR_I64 = 6 << 4,
SLE_VAR_U64 = 7 << 4,
SLE_VAR_NULL = 8 << 4, // useful to write zeros in savegame.
SLE_VAR_INT = SLE_VAR_I32,
SLE_VAR_UINT = SLE_VAR_U32,
SLE_INT8 = SLE_FILE_I8 | SLE_VAR_I8,
SLE_UINT8 = SLE_FILE_U8 | SLE_VAR_U8,
SLE_INT16 = SLE_FILE_I16 | SLE_VAR_I16,
SLE_UINT16 = SLE_FILE_U16 | SLE_VAR_U16,
SLE_INT32 = SLE_FILE_I32 | SLE_VAR_I32,
SLE_UINT32 = SLE_FILE_U32 | SLE_VAR_U32,
SLE_INT64 = SLE_FILE_I64 | SLE_VAR_I64,
SLE_UINT64 = SLE_FILE_U64 | SLE_VAR_U64,
SLE_STRINGID = SLE_FILE_STRINGID | SLE_VAR_U16,
} VarType;
enum SaveLoadTypes {
SL_VAR = 0,
SL_REF = 1,
SL_ARR = 2,
SL_CONDVAR = 0 | (1 << 2), // 4
SL_CONDREF = 1 | (1 << 2), // 5
SL_CONDARR = 2 | (1 << 2), // 6
// non-normal save-load types
SL_WRITEBYTE = 8,
SL_INCLUDE = 9,
SL_END = 15
};
/** SaveLoad type struct. Do NOT use this directly but use the SLE_ macros defined just below! */
struct SaveLoad {
byte cmd; /// the action to take with the saved/loaded type, All types need different action
VarType type; /// type of the variable to be saved, int
uint16 offset; /// offset of this variable in the struct (max offset is 65536)
uint16 length; /// (conditional) length of the variable (eg. arrays) (max array size is 65536 elements)
uint16 version_from; /// save/load the variable starting from this savegame version
uint16 version_to; /// save/load the variable until this savegame version
};
/* Simple variables, references (pointers) and arrays */
#define SLE_VAR(base, variable, type) {SL_VAR, type, offsetof(base, variable), 0, 0, 0}
#define SLE_REF(base, variable, type) {SL_REF, type, offsetof(base, variable), 0, 0, 0}
#define SLE_ARR(base, variable, type, length) {SL_ARR, type, offsetof(base, variable), length, 0, 0}
/* Conditional variables, references (pointers) and arrays that are only valid for certain savegame versions */
#define SLE_CONDVAR(base, variable, type, from, to) {SL_CONDVAR, type, offsetof(base, variable), 0, from, to}
#define SLE_CONDREF(base, variable, type, from, to) {SL_CONDREF, type, offsetof(base, variable), 0, from, to}
#define SLE_CONDARR(base, variable, type, length, from, to) {SL_CONDARR, type, offsetof(base, variable), length, from, to}
/* Translate values ingame to different values in the savegame and vv */
#define SLE_WRITEBYTE(base, variable, game_value, file_value) {SL_WRITEBYTE, 0, offsetof(base, variable), 0, game_value, file_value}
/* Load common code and put it into each struct (currently only for vehicles */
#define SLE_INCLUDE(base, variable, include_index) {SL_INCLUDE, 0, offsetof(base, variable), 0, include_index, 0}
/* The same as the ones at the top, only the offset is given directly; used for unions */
#define SLE_VARX(offset, type) {SL_VAR, type, offset, 0, 0, 0}
#define SLE_REFX(offset, type) {SL_REF, type, offset, 0, 0, 0}
#define SLE_CONDVARX(offset, type, from, to) {SL_CONDVAR, type, offset, 0, from, to}
#define SLE_CONDREFX(offset, type, from, to) {SL_CONDREF, type, offset, 0, from, to}
#define SLE_WRITEBYTEX(offset, something) {SL_WRITEBYTE, 0, offset, 0, something, 0}
#define SLE_INCLUDEX(offset, type) {SL_INCLUDE, type, offset, 0, 0, 0}
/* End marker */
#define SLE_END() {SL_END, 0, 0, 0, 0, 0}
void SlSetArrayIndex(uint index);
int SlIterateArray(void);
void SlArray(void *array, uint length, VarType conv);
void SlObject(void *object, const SaveLoad *desc);
void SlAutolength(AutolengthProc *proc, void *arg);
uint SlGetFieldLength(void);
int SlReadByte(void);
void SlSetLength(size_t length);
void SlWriteByte(byte b);
void SlGlobList(const SaveLoadGlobVarList *desc);
#endif /* SAVELOAD_H */
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