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00012 #include "../stdafx.h"
00013 #include "../debug.h"
00014 #include "../strings_type.h"
00015 #include "../string_func.h"
00016 #include "../settings_type.h"
00017 #include "../fileio_func.h"
00018
00019 #include "table/strings.h"
00020
00021 #include "saveload_internal.h"
00022 #include "oldloader.h"
00023
00024 #include <exception>
00025
00026 static const int TTO_HEADER_SIZE = 41;
00027 static const int TTD_HEADER_SIZE = 49;
00028
00029 uint32 _bump_assert_value;
00030
00031 static inline OldChunkType GetOldChunkType(OldChunkType type) {return (OldChunkType)GB(type, 0, 4);}
00032 static inline OldChunkType GetOldChunkVarType(OldChunkType type) {return (OldChunkType)(GB(type, 8, 8) << 8);}
00033 static inline OldChunkType GetOldChunkFileType(OldChunkType type) {return (OldChunkType)(GB(type, 16, 8) << 16);}
00034
00035 static inline byte CalcOldVarLen(OldChunkType type)
00036 {
00037 static const byte type_mem_size[] = {0, 1, 1, 2, 2, 4, 4, 8};
00038 byte length = GB(type, 8, 8);
00039 assert(length != 0 && length < lengthof(type_mem_size));
00040 return type_mem_size[length];
00041 }
00042
00048 static byte ReadByteFromFile(LoadgameState *ls)
00049 {
00050
00051
00052 if (ls->buffer_cur >= ls->buffer_count) {
00053
00054
00055 int count = (int)fread(ls->buffer, 1, BUFFER_SIZE, ls->file);
00056
00057
00058 if (count == 0) {
00059 DEBUG(oldloader, 0, "Read past end of file, loading failed");
00060 throw std::exception();
00061 }
00062
00063 ls->buffer_count = count;
00064 ls->buffer_cur = 0;
00065 }
00066
00067 return ls->buffer[ls->buffer_cur++];
00068 }
00069
00075 byte ReadByte(LoadgameState *ls)
00076 {
00077
00078
00079
00080
00081
00082
00083 if (ls->chunk_size == 0) {
00084
00085 int8 new_byte = ReadByteFromFile(ls);
00086
00087 if (new_byte < 0) {
00088
00089 ls->decoding = true;
00090 ls->decode_char = ReadByteFromFile(ls);
00091 ls->chunk_size = -new_byte + 1;
00092 } else {
00093 ls->decoding = false;
00094 ls->chunk_size = new_byte + 1;
00095 }
00096 }
00097
00098 ls->total_read++;
00099 ls->chunk_size--;
00100
00101 return ls->decoding ? ls->decode_char : ReadByteFromFile(ls);
00102 }
00103
00109 bool LoadChunk(LoadgameState *ls, void *base, const OldChunks *chunks)
00110 {
00111 byte *base_ptr = (byte*)base;
00112
00113 for (const OldChunks *chunk = chunks; chunk->type != OC_END; chunk++) {
00114 if (((chunk->type & OC_TTD) && _savegame_type == SGT_TTO) ||
00115 ((chunk->type & OC_TTO) && _savegame_type != SGT_TTO)) {
00116
00117 continue;
00118 }
00119
00120 byte *ptr = (byte*)chunk->ptr;
00121 if (chunk->type & OC_DEREFERENCE_POINTER) ptr = *(byte**)ptr;
00122
00123 for (uint i = 0; i < chunk->amount; i++) {
00124
00125 if (GetOldChunkType(chunk->type) != 0) {
00126 switch (GetOldChunkType(chunk->type)) {
00127
00128 case OC_NULL: ReadByte(ls); break;
00129
00130 case OC_CHUNK:
00131
00132
00133 if (!chunk->proc(ls, i)) return false;
00134 break;
00135
00136 case OC_ASSERT:
00137 DEBUG(oldloader, 4, "Assert point: 0x%X / 0x%X", ls->total_read, chunk->offset + _bump_assert_value);
00138 if (ls->total_read != chunk->offset + _bump_assert_value) throw std::exception();
00139 default: break;
00140 }
00141 } else {
00142 uint64 res = 0;
00143
00144
00145 switch (GetOldChunkFileType(chunk->type)) {
00146 case OC_FILE_I8: res = (int8)ReadByte(ls); break;
00147 case OC_FILE_U8: res = ReadByte(ls); break;
00148 case OC_FILE_I16: res = (int16)ReadUint16(ls); break;
00149 case OC_FILE_U16: res = ReadUint16(ls); break;
00150 case OC_FILE_I32: res = (int32)ReadUint32(ls); break;
00151 case OC_FILE_U32: res = ReadUint32(ls); break;
00152 default: NOT_REACHED();
00153 }
00154
00155
00156 if (base_ptr == NULL && chunk->ptr == NULL) continue;
00157
00158
00159 if (chunk->ptr == NULL) ptr = base_ptr + chunk->offset;
00160
00161
00162 switch (GetOldChunkVarType(chunk->type)) {
00163 case OC_VAR_I8: *(int8 *)ptr = GB(res, 0, 8); break;
00164 case OC_VAR_U8: *(uint8 *)ptr = GB(res, 0, 8); break;
00165 case OC_VAR_I16:*(int16 *)ptr = GB(res, 0, 16); break;
00166 case OC_VAR_U16:*(uint16*)ptr = GB(res, 0, 16); break;
00167 case OC_VAR_I32:*(int32 *)ptr = res; break;
00168 case OC_VAR_U32:*(uint32*)ptr = res; break;
00169 case OC_VAR_I64:*(int64 *)ptr = res; break;
00170 case OC_VAR_U64:*(uint64*)ptr = res; break;
00171 default: NOT_REACHED();
00172 }
00173
00174
00175 if (chunk->amount > 1 && chunk->ptr != NULL) ptr += CalcOldVarLen(chunk->type);
00176 }
00177 }
00178 }
00179
00180 return true;
00181 }
00182
00188 static void InitLoading(LoadgameState *ls)
00189 {
00190 ls->chunk_size = 0;
00191 ls->total_read = 0;
00192
00193 ls->decoding = false;
00194 ls->decode_char = 0;
00195
00196 ls->buffer_cur = 0;
00197 ls->buffer_count = 0;
00198 memset(ls->buffer, 0, BUFFER_SIZE);
00199
00200 _bump_assert_value = 0;
00201
00202 _settings_game.construction.freeform_edges = false;
00203 }
00204
00212 static bool VerifyOldNameChecksum(char *title, uint len)
00213 {
00214 uint16 sum = 0;
00215 for (uint i = 0; i < len - 2; i++) {
00216 sum += title[i];
00217 sum = ROL(sum, 1);
00218 }
00219
00220 sum ^= 0xAAAA;
00221
00222 uint16 sum2 = title[len - 2];
00223 SB(sum2, 8, 8, title[len - 1]);
00224
00225 return sum == sum2;
00226 }
00227
00228 static inline bool CheckOldSavegameType(FILE *f, char *temp, const char *last, uint len)
00229 {
00230 assert(last - temp + 1 >= (int)len);
00231
00232 if (fread(temp, 1, len, f) != len) {
00233 temp[0] = '\0';
00234 return false;
00235 }
00236
00237 bool ret = VerifyOldNameChecksum(temp, len);
00238 temp[len - 2] = '\0';
00239 str_validate(temp, last);
00240
00241 return ret;
00242 }
00243
00244 static SavegameType DetermineOldSavegameType(FILE *f, char *title, const char *last)
00245 {
00246 assert_compile(TTD_HEADER_SIZE >= TTO_HEADER_SIZE);
00247 char temp[TTD_HEADER_SIZE];
00248
00249 SavegameType type = SGT_TTO;
00250
00251
00252 long pos = ftell(f);
00253 if (!CheckOldSavegameType(f, temp, lastof(temp), TTO_HEADER_SIZE)) {
00254 type = SGT_TTD;
00255 fseek(f, pos, SEEK_SET);
00256 if (!CheckOldSavegameType(f, temp, lastof(temp), TTD_HEADER_SIZE)) {
00257 type = SGT_INVALID;
00258 }
00259 }
00260
00261 if (title != NULL) {
00262 switch (type) {
00263 case SGT_TTO: title = strecpy(title, "(TTO) ", last); break;
00264 case SGT_TTD: title = strecpy(title, "(TTD) ", last); break;
00265 default: title = strecpy(title, "(broken) ", last); break;
00266 }
00267 title = strecpy(title, temp, last);
00268 }
00269
00270 return type;
00271 }
00272
00273 typedef bool LoadOldMainProc(LoadgameState *ls);
00274
00275 bool LoadOldSaveGame(const char *file)
00276 {
00277 LoadgameState ls;
00278
00279 DEBUG(oldloader, 3, "Trying to load a TTD(Patch) savegame");
00280
00281 InitLoading(&ls);
00282
00283
00284 ls.file = FioFOpenFile(file, "rb");
00285
00286 if (ls.file == NULL) {
00287 DEBUG(oldloader, 0, "Cannot open file '%s'", file);
00288 return false;
00289 }
00290
00291 SavegameType type = DetermineOldSavegameType(ls.file, NULL, NULL);
00292
00293 LoadOldMainProc *proc = NULL;
00294
00295 switch (type) {
00296 case SGT_TTO: proc = &LoadTTOMain; break;
00297 case SGT_TTD: proc = &LoadTTDMain; break;
00298 default: break;
00299 }
00300
00301 _savegame_type = type;
00302
00303 bool game_loaded;
00304 try {
00305 game_loaded = proc != NULL && proc(&ls);
00306 } catch (...) {
00307 game_loaded = false;
00308 }
00309
00310 if (!game_loaded) {
00311 SetSaveLoadError(STR_GAME_SAVELOAD_ERROR_DATA_INTEGRITY_CHECK_FAILED);
00312 fclose(ls.file);
00313 return false;
00314 }
00315
00316 _pause_mode = 2;
00317
00318 return true;
00319 }
00320
00321 void GetOldSaveGameName(const char *file, char *title, const char *last)
00322 {
00323 FILE *f = FioFOpenFile(file, "rb");
00324
00325 if (f == NULL) {
00326 *title = '\0';
00327 return;
00328 }
00329
00330 DetermineOldSavegameType(f, title, last);
00331
00332 fclose(f);
00333 }