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Diffstat (limited to 'src/saveload/oldloader.h')
-rw-r--r-- | src/saveload/oldloader.h | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/src/saveload/oldloader.h b/src/saveload/oldloader.h new file mode 100644 index 000000000..5cde06cc5 --- /dev/null +++ b/src/saveload/oldloader.h @@ -0,0 +1,124 @@ +/* $Id$ */ + +/** @file oldloader.h Declarations of strctures and function used in loader of old savegames */ + +#ifndef OLDLOADER_H +#define OLDLOADER_H + +#include "saveload.h" + +enum { + BUFFER_SIZE = 4096, + OLD_MAP_SIZE = 256 * 256, +}; + +struct LoadgameState { + FILE *file; + + uint chunk_size; + + bool decoding; + byte decode_char; + + uint buffer_count; + uint buffer_cur; + byte buffer[BUFFER_SIZE]; + + uint total_read; + bool failed; +}; + +/* OldChunk-Type */ +enum OldChunkType { + OC_SIMPLE = 0, + OC_NULL = 1, + OC_CHUNK = 2, + OC_ASSERT = 3, + /* 8 bits allocated (256 max) */ + + OC_VAR_I8 = 1 << 8, + OC_VAR_U8 = 2 << 8, + OC_VAR_I16 = 3 << 8, + OC_VAR_U16 = 4 << 8, + OC_VAR_I32 = 5 << 8, + OC_VAR_U32 = 6 << 8, + OC_VAR_I64 = 7 << 8, + /* 8 bits allocated (256 max) */ + + OC_FILE_I8 = 1 << 16, + OC_FILE_U8 = 2 << 16, + OC_FILE_I16 = 3 << 16, + OC_FILE_U16 = 4 << 16, + OC_FILE_I32 = 5 << 16, + OC_FILE_U32 = 6 << 16, + /* 8 bits allocated (256 max) */ + + OC_INT8 = OC_VAR_I8 | OC_FILE_I8, + OC_UINT8 = OC_VAR_U8 | OC_FILE_U8, + OC_INT16 = OC_VAR_I16 | OC_FILE_I16, + OC_UINT16 = OC_VAR_U16 | OC_FILE_U16, + OC_INT32 = OC_VAR_I32 | OC_FILE_I32, + OC_UINT32 = OC_VAR_U32 | OC_FILE_U32, + + OC_TILE = OC_VAR_U32 | OC_FILE_U16, + + /** + * Dereference the pointer once before writing to it, + * so we do not have to use big static arrays. + */ + OC_DEREFERENCE_POINTER = 1 << 31, + + OC_END = 0 ///< End of the whole chunk, all 32 bits set to zero +}; + +DECLARE_ENUM_AS_BIT_SET(OldChunkType); + +typedef bool OldChunkProc(LoadgameState *ls, int num); + +struct OldChunks { + OldChunkType type; ///< Type of field + uint32 amount; ///< Amount of fields + + void *ptr; ///< Pointer where to save the data (may only be set if offset is 0) + uint offset; ///< Offset from basepointer (may only be set if ptr is NULL) + OldChunkProc *proc; ///< Pointer to function that is called with OC_CHUNK +}; + +/* If it fails, check lines above.. */ +assert_compile(sizeof(TileIndex) == 4); + +extern uint _bump_assert_value; +byte ReadByte(LoadgameState *ls); +bool LoadChunk(LoadgameState *ls, void *base, const OldChunks *chunks); + +bool LoadOldMain(LoadgameState *ls); + +static inline uint16 ReadUint16(LoadgameState *ls) +{ + byte x = ReadByte(ls); + return x | ReadByte(ls) << 8; +} + +static inline uint32 ReadUint32(LoadgameState *ls) +{ + uint16 x = ReadUint16(ls); + return x | ReadUint16(ls) << 16; +} + +/* Help: + * - OCL_SVAR: load 'type' to offset 'offset' in a struct of type 'base', which must also + * be given via base in LoadChunk() as real pointer + * - OCL_VAR: load 'type' to a global var + * - OCL_END: every struct must end with this + * - OCL_NULL: read 'amount' of bytes and send them to /dev/null or something + * - OCL_CHUNK: load an other proc to load a part of the savegame, 'amount' times + * - OCL_ASSERT: to check if we are really at the place we expect to be.. because old savegames are too binary to be sure ;) + */ +#define OCL_SVAR(type, base, offset) { type, 1, NULL, (uint)cpp_offsetof(base, offset), NULL } +#define OCL_VAR(type, amount, pointer) { type, amount, pointer, 0, NULL } +#define OCL_END() { OC_END, 0, NULL, 0, NULL } +#define OCL_NULL(amount) { OC_NULL, amount, NULL, 0, NULL } +#define OCL_CHUNK(amount, proc) { OC_CHUNK, amount, NULL, 0, proc } +#define OCL_ASSERT(size) { OC_ASSERT, 1, NULL, size, NULL } + +#endif /* OLDLOADER_H */ |