00001
00002
00005 #include "../stdafx.h"
00006 #include "../openttd.h"
00007 #include "../tile_type.h"
00008 #include "../debug.h"
00009 #include "../strings_type.h"
00010 #include "../string_func.h"
00011 #include "../settings_type.h"
00012 #include "../fileio_func.h"
00013
00014 #include "table/strings.h"
00015
00016 #include "saveload_internal.h"
00017 #include "oldloader.h"
00018
00019 enum {
00020 TTO_HEADER_SIZE = 41,
00021 TTD_HEADER_SIZE = 49,
00022 };
00023
00024 uint32 _bump_assert_value;
00025
00026 static inline OldChunkType GetOldChunkType(OldChunkType type) {return (OldChunkType)GB(type, 0, 4);}
00027 static inline OldChunkType GetOldChunkVarType(OldChunkType type) {return (OldChunkType)(GB(type, 8, 8) << 8);}
00028 static inline OldChunkType GetOldChunkFileType(OldChunkType type) {return (OldChunkType)(GB(type, 16, 8) << 16);}
00029
00030 static inline byte CalcOldVarLen(OldChunkType type)
00031 {
00032 static const byte type_mem_size[] = {0, 1, 1, 2, 2, 4, 4, 8};
00033 byte length = GB(type, 8, 8);
00034 assert(length != 0 && length < lengthof(type_mem_size));
00035 return type_mem_size[length];
00036 }
00037
00043 static byte ReadByteFromFile(LoadgameState *ls)
00044 {
00045
00046
00047 if (ls->buffer_cur >= ls->buffer_count) {
00048
00049 int count = (int)fread(ls->buffer, 1, BUFFER_SIZE, ls->file);
00050
00051
00052 if (count == 0) {
00053 DEBUG(oldloader, 0, "Read past end of file, loading failed");
00054 ls->failed = true;
00055 }
00056
00057 ls->buffer_count = count;
00058 ls->buffer_cur = 0;
00059 }
00060
00061 return ls->buffer[ls->buffer_cur++];
00062 }
00063
00069 byte ReadByte(LoadgameState *ls)
00070 {
00071
00072
00073
00074
00075
00076
00077 if (ls->chunk_size == 0) {
00078
00079 int8 new_byte = ReadByteFromFile(ls);
00080
00081 if (new_byte < 0) {
00082
00083 ls->decoding = true;
00084 ls->decode_char = ReadByteFromFile(ls);
00085 ls->chunk_size = -new_byte + 1;
00086 } else {
00087 ls->decoding = false;
00088 ls->chunk_size = new_byte + 1;
00089 }
00090 }
00091
00092 ls->total_read++;
00093 ls->chunk_size--;
00094
00095 return ls->decoding ? ls->decode_char : ReadByteFromFile(ls);
00096 }
00097
00103 bool LoadChunk(LoadgameState *ls, void *base, const OldChunks *chunks)
00104 {
00105 byte *base_ptr = (byte*)base;
00106
00107 for (const OldChunks *chunk = chunks; chunk->type != OC_END; chunk++) {
00108 if (((chunk->type & OC_TTD) && (_savegame_type == SGT_TTO)) ||
00109 ((chunk->type & OC_TTO) && (_savegame_type != SGT_TTO))) {
00110
00111 continue;
00112 }
00113
00114 byte *ptr = (byte*)chunk->ptr;
00115 if (chunk->type & OC_DEREFERENCE_POINTER) ptr = *(byte**)ptr;
00116
00117 for (uint i = 0; i < chunk->amount; i++) {
00118 if (ls->failed) return false;
00119
00120
00121 if (GetOldChunkType(chunk->type) != 0) {
00122 switch (GetOldChunkType(chunk->type)) {
00123
00124 case OC_NULL: ReadByte(ls); break;
00125
00126 case OC_CHUNK:
00127
00128
00129 if (!chunk->proc(ls, i)) return false;
00130 break;
00131
00132 case OC_ASSERT:
00133 DEBUG(oldloader, 4, "Assert point: 0x%X / 0x%X", ls->total_read, chunk->offset + _bump_assert_value);
00134 if (ls->total_read != chunk->offset + _bump_assert_value) ls->failed = true;
00135 default: break;
00136 }
00137 } else {
00138 uint64 res = 0;
00139
00140
00141 switch (GetOldChunkFileType(chunk->type)) {
00142 case OC_FILE_I8: res = (int8)ReadByte(ls); break;
00143 case OC_FILE_U8: res = ReadByte(ls); break;
00144 case OC_FILE_I16: res = (int16)ReadUint16(ls); break;
00145 case OC_FILE_U16: res = ReadUint16(ls); break;
00146 case OC_FILE_I32: res = (int32)ReadUint32(ls); break;
00147 case OC_FILE_U32: res = ReadUint32(ls); break;
00148 default: NOT_REACHED();
00149 }
00150
00151
00152 assert(base_ptr != NULL || chunk->ptr != NULL);
00153
00154
00155 if (chunk->ptr == NULL) ptr = base_ptr + chunk->offset;
00156
00157
00158 switch (GetOldChunkVarType(chunk->type)) {
00159 case OC_VAR_I8: *(int8 *)ptr = GB(res, 0, 8); break;
00160 case OC_VAR_U8: *(uint8 *)ptr = GB(res, 0, 8); break;
00161 case OC_VAR_I16:*(int16 *)ptr = GB(res, 0, 16); break;
00162 case OC_VAR_U16:*(uint16*)ptr = GB(res, 0, 16); break;
00163 case OC_VAR_I32:*(int32 *)ptr = res; break;
00164 case OC_VAR_U32:*(uint32*)ptr = res; break;
00165 case OC_VAR_I64:*(int64 *)ptr = res; break;
00166 case OC_VAR_U64:*(uint64*)ptr = res; break;
00167 default: NOT_REACHED();
00168 }
00169
00170
00171 if (chunk->amount > 1 && chunk->ptr != NULL) ptr += CalcOldVarLen(chunk->type);
00172 }
00173 }
00174 }
00175
00176 return true;
00177 }
00178
00184 static void InitLoading(LoadgameState *ls)
00185 {
00186 ls->chunk_size = 0;
00187 ls->total_read = 0;
00188 ls->failed = false;
00189
00190 ls->decoding = false;
00191 ls->decode_char = 0;
00192
00193 ls->buffer_cur = 0;
00194 ls->buffer_count = 0;
00195 memset(ls->buffer, 0, BUFFER_SIZE);
00196
00197 _bump_assert_value = 0;
00198
00199 _settings_game.construction.freeform_edges = false;
00200 }
00201
00208 static bool VerifyOldNameChecksum(char *title, uint len)
00209 {
00210 uint16 sum = 0;
00211 for (uint i = 0; i < len - 2; i++) {
00212 sum += title[i];
00213 sum = ROL(sum, 1);
00214 }
00215
00216 sum ^= 0xAAAA;
00217
00218 uint16 sum2 = title[len - 2];
00219 SB(sum2, 8, 8, title[len - 1]);
00220
00221 return sum == sum2;
00222 }
00223
00224 static inline bool CheckOldSavegameType(FILE *f, char *temp, const char *last, uint len)
00225 {
00226 assert(last - temp + 1 >= (int)len);
00227
00228 if (fread(temp, 1, len, f) != len) {
00229 temp[0] = '\0';
00230 return false;
00231 }
00232
00233 bool ret = VerifyOldNameChecksum(temp, len);
00234 temp[len - 2] = '\0';
00235 str_validate(temp, last);
00236
00237 return ret;
00238 }
00239
00240 assert_compile(TTD_HEADER_SIZE >= TTO_HEADER_SIZE);
00241 static SavegameType DetermineOldSavegameType(FILE *f, char *title, const char *last)
00242 {
00243 char temp[TTD_HEADER_SIZE];
00244
00245 SavegameType type = SGT_TTO;
00246
00247
00248 long pos = ftell(f);
00249 if (!CheckOldSavegameType(f, temp, lastof(temp), TTO_HEADER_SIZE)) {
00250 type = SGT_TTD;
00251 fseek(f, pos, SEEK_SET);
00252 if (!CheckOldSavegameType(f, temp, lastof(temp), TTD_HEADER_SIZE)) {
00253 type = SGT_INVALID;
00254 }
00255 }
00256
00257 if (title != NULL) {
00258 switch (type) {
00259 case SGT_TTO: title = strecpy(title, "(TTO) ", last); break;
00260 case SGT_TTD: title = strecpy(title, "(TTD) ", last); break;
00261 default: title = strecpy(title, "(broken) ", last); break;
00262 }
00263 title = strecpy(title, temp, last);
00264 }
00265
00266 return type;
00267 }
00268
00269 typedef bool LoadOldMainProc(LoadgameState *ls);
00270
00271 bool LoadOldSaveGame(const char *file)
00272 {
00273 LoadgameState ls;
00274
00275 DEBUG(oldloader, 3, "Trying to load a TTD(Patch) savegame");
00276
00277 InitLoading(&ls);
00278
00279
00280 ls.file = FioFOpenFile(file, "rb");
00281
00282 if (ls.file == NULL) {
00283 DEBUG(oldloader, 0, "Cannot open file '%s'", file);
00284 return false;
00285 }
00286
00287 SavegameType type = DetermineOldSavegameType(ls.file, NULL, NULL);
00288
00289 LoadOldMainProc *proc = NULL;
00290
00291 switch (type) {
00292 case SGT_TTO: proc = &LoadTTOMain; break;
00293 case SGT_TTD: proc = &LoadTTDMain; break;
00294 default: break;
00295 }
00296
00297 _savegame_type = type;
00298
00299 if (proc == NULL || !proc(&ls)) {
00300 SetSaveLoadError(STR_GAME_SAVELOAD_ERROR_DATA_INTEGRITY_CHECK_FAILED);
00301 fclose(ls.file);
00302 return false;
00303 }
00304
00305 _pause_game = 2;
00306
00307 return true;
00308 }
00309
00310 void GetOldSaveGameName(const char *file, char *title, const char *last)
00311 {
00312 FILE *f = FioFOpenFile(file, "rb");
00313
00314 if (f == NULL) {
00315 *title = '\0';
00316 return;
00317 }
00318
00319 DetermineOldSavegameType(f, title, last);
00320
00321 fclose(f);
00322 }