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00012 #include "../stdafx.h"
00013 #include "../openttd.h"
00014 #include "../debug.h"
00015 #include "../strings_type.h"
00016 #include "../string_func.h"
00017 #include "../settings_type.h"
00018 #include "../fileio_func.h"
00019
00020 #include "table/strings.h"
00021
00022 #include "saveload_internal.h"
00023 #include "oldloader.h"
00024
00025 #include <exception>
00026
00027 static const int TTO_HEADER_SIZE = 41;
00028 static const int TTD_HEADER_SIZE = 49;
00029
00030 uint32 _bump_assert_value;
00031
00032 static inline OldChunkType GetOldChunkType(OldChunkType type) {return (OldChunkType)GB(type, 0, 4);}
00033 static inline OldChunkType GetOldChunkVarType(OldChunkType type) {return (OldChunkType)(GB(type, 8, 8) << 8);}
00034 static inline OldChunkType GetOldChunkFileType(OldChunkType type) {return (OldChunkType)(GB(type, 16, 8) << 16);}
00035
00036 static inline byte CalcOldVarLen(OldChunkType type)
00037 {
00038 static const byte type_mem_size[] = {0, 1, 1, 2, 2, 4, 4, 8};
00039 byte length = GB(type, 8, 8);
00040 assert(length != 0 && length < lengthof(type_mem_size));
00041 return type_mem_size[length];
00042 }
00043
00049 static byte ReadByteFromFile(LoadgameState *ls)
00050 {
00051
00052
00053 if (ls->buffer_cur >= ls->buffer_count) {
00054
00055
00056 int count = (int)fread(ls->buffer, 1, BUFFER_SIZE, ls->file);
00057
00058
00059 if (count == 0) {
00060 DEBUG(oldloader, 0, "Read past end of file, loading failed");
00061 throw std::exception();
00062 }
00063
00064 ls->buffer_count = count;
00065 ls->buffer_cur = 0;
00066 }
00067
00068 return ls->buffer[ls->buffer_cur++];
00069 }
00070
00076 byte ReadByte(LoadgameState *ls)
00077 {
00078
00079
00080
00081
00082
00083
00084 if (ls->chunk_size == 0) {
00085
00086 int8 new_byte = ReadByteFromFile(ls);
00087
00088 if (new_byte < 0) {
00089
00090 ls->decoding = true;
00091 ls->decode_char = ReadByteFromFile(ls);
00092 ls->chunk_size = -new_byte + 1;
00093 } else {
00094 ls->decoding = false;
00095 ls->chunk_size = new_byte + 1;
00096 }
00097 }
00098
00099 ls->total_read++;
00100 ls->chunk_size--;
00101
00102 return ls->decoding ? ls->decode_char : ReadByteFromFile(ls);
00103 }
00104
00110 bool LoadChunk(LoadgameState *ls, void *base, const OldChunks *chunks)
00111 {
00112 byte *base_ptr = (byte*)base;
00113
00114 for (const OldChunks *chunk = chunks; chunk->type != OC_END; chunk++) {
00115 if (((chunk->type & OC_TTD) && _savegame_type == SGT_TTO) ||
00116 ((chunk->type & OC_TTO) && _savegame_type != SGT_TTO)) {
00117
00118 continue;
00119 }
00120
00121 byte *ptr = (byte*)chunk->ptr;
00122 if (chunk->type & OC_DEREFERENCE_POINTER) ptr = *(byte**)ptr;
00123
00124 for (uint i = 0; i < chunk->amount; i++) {
00125
00126 if (GetOldChunkType(chunk->type) != 0) {
00127 switch (GetOldChunkType(chunk->type)) {
00128
00129 case OC_NULL: ReadByte(ls); break;
00130
00131 case OC_CHUNK:
00132
00133
00134 if (!chunk->proc(ls, i)) return false;
00135 break;
00136
00137 case OC_ASSERT:
00138 DEBUG(oldloader, 4, "Assert point: 0x%X / 0x%X", ls->total_read, chunk->offset + _bump_assert_value);
00139 if (ls->total_read != chunk->offset + _bump_assert_value) throw std::exception();
00140 default: break;
00141 }
00142 } else {
00143 uint64 res = 0;
00144
00145
00146 switch (GetOldChunkFileType(chunk->type)) {
00147 case OC_FILE_I8: res = (int8)ReadByte(ls); break;
00148 case OC_FILE_U8: res = ReadByte(ls); break;
00149 case OC_FILE_I16: res = (int16)ReadUint16(ls); break;
00150 case OC_FILE_U16: res = ReadUint16(ls); break;
00151 case OC_FILE_I32: res = (int32)ReadUint32(ls); break;
00152 case OC_FILE_U32: res = ReadUint32(ls); break;
00153 default: NOT_REACHED();
00154 }
00155
00156
00157 if (base_ptr == NULL && chunk->ptr == NULL) continue;
00158
00159
00160 if (chunk->ptr == NULL) ptr = base_ptr + chunk->offset;
00161
00162
00163 switch (GetOldChunkVarType(chunk->type)) {
00164 case OC_VAR_I8: *(int8 *)ptr = GB(res, 0, 8); break;
00165 case OC_VAR_U8: *(uint8 *)ptr = GB(res, 0, 8); break;
00166 case OC_VAR_I16:*(int16 *)ptr = GB(res, 0, 16); break;
00167 case OC_VAR_U16:*(uint16*)ptr = GB(res, 0, 16); break;
00168 case OC_VAR_I32:*(int32 *)ptr = res; break;
00169 case OC_VAR_U32:*(uint32*)ptr = res; break;
00170 case OC_VAR_I64:*(int64 *)ptr = res; break;
00171 case OC_VAR_U64:*(uint64*)ptr = res; break;
00172 default: NOT_REACHED();
00173 }
00174
00175
00176 if (chunk->amount > 1 && chunk->ptr != NULL) ptr += CalcOldVarLen(chunk->type);
00177 }
00178 }
00179 }
00180
00181 return true;
00182 }
00183
00189 static void InitLoading(LoadgameState *ls)
00190 {
00191 ls->chunk_size = 0;
00192 ls->total_read = 0;
00193
00194 ls->decoding = false;
00195 ls->decode_char = 0;
00196
00197 ls->buffer_cur = 0;
00198 ls->buffer_count = 0;
00199 memset(ls->buffer, 0, BUFFER_SIZE);
00200
00201 _bump_assert_value = 0;
00202
00203 _settings_game.construction.freeform_edges = false;
00204 }
00205
00213 static bool VerifyOldNameChecksum(char *title, uint len)
00214 {
00215 uint16 sum = 0;
00216 for (uint i = 0; i < len - 2; i++) {
00217 sum += title[i];
00218 sum = ROL(sum, 1);
00219 }
00220
00221 sum ^= 0xAAAA;
00222
00223 uint16 sum2 = title[len - 2];
00224 SB(sum2, 8, 8, title[len - 1]);
00225
00226 return sum == sum2;
00227 }
00228
00229 static inline bool CheckOldSavegameType(FILE *f, char *temp, const char *last, uint len)
00230 {
00231 assert(last - temp + 1 >= (int)len);
00232
00233 if (fread(temp, 1, len, f) != len) {
00234 temp[0] = '\0';
00235 return false;
00236 }
00237
00238 bool ret = VerifyOldNameChecksum(temp, len);
00239 temp[len - 2] = '\0';
00240 str_validate(temp, last);
00241
00242 return ret;
00243 }
00244
00245 static SavegameType DetermineOldSavegameType(FILE *f, char *title, const char *last)
00246 {
00247 assert_compile(TTD_HEADER_SIZE >= TTO_HEADER_SIZE);
00248 char temp[TTD_HEADER_SIZE];
00249
00250 SavegameType type = SGT_TTO;
00251
00252
00253 long pos = ftell(f);
00254 if (!CheckOldSavegameType(f, temp, lastof(temp), TTO_HEADER_SIZE)) {
00255 type = SGT_TTD;
00256 fseek(f, pos, SEEK_SET);
00257 if (!CheckOldSavegameType(f, temp, lastof(temp), TTD_HEADER_SIZE)) {
00258 type = SGT_INVALID;
00259 }
00260 }
00261
00262 if (title != NULL) {
00263 switch (type) {
00264 case SGT_TTO: title = strecpy(title, "(TTO) ", last); break;
00265 case SGT_TTD: title = strecpy(title, "(TTD) ", last); break;
00266 default: title = strecpy(title, "(broken) ", last); break;
00267 }
00268 title = strecpy(title, temp, last);
00269 }
00270
00271 return type;
00272 }
00273
00274 typedef bool LoadOldMainProc(LoadgameState *ls);
00275
00276 bool LoadOldSaveGame(const char *file)
00277 {
00278 LoadgameState ls;
00279
00280 DEBUG(oldloader, 3, "Trying to load a TTD(Patch) savegame");
00281
00282 InitLoading(&ls);
00283
00284
00285 ls.file = FioFOpenFile(file, "rb");
00286
00287 if (ls.file == NULL) {
00288 DEBUG(oldloader, 0, "Cannot open file '%s'", file);
00289 return false;
00290 }
00291
00292 SavegameType type = DetermineOldSavegameType(ls.file, NULL, NULL);
00293
00294 LoadOldMainProc *proc = NULL;
00295
00296 switch (type) {
00297 case SGT_TTO: proc = &LoadTTOMain; break;
00298 case SGT_TTD: proc = &LoadTTDMain; break;
00299 default: break;
00300 }
00301
00302 _savegame_type = type;
00303
00304 bool game_loaded;
00305 try {
00306 game_loaded = proc != NULL && proc(&ls);
00307 } catch (...) {
00308 game_loaded = false;
00309 }
00310
00311 if (!game_loaded) {
00312 SetSaveLoadError(STR_GAME_SAVELOAD_ERROR_DATA_INTEGRITY_CHECK_FAILED);
00313 fclose(ls.file);
00314 return false;
00315 }
00316
00317 _pause_mode = 2;
00318
00319 return true;
00320 }
00321
00322 void GetOldSaveGameName(const char *file, char *title, const char *last)
00323 {
00324 FILE *f = FioFOpenFile(file, "rb");
00325
00326 if (f == NULL) {
00327 *title = '\0';
00328 return;
00329 }
00330
00331 DetermineOldSavegameType(f, title, last);
00332
00333 fclose(f);
00334 }