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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 enum {
00026 TTO_HEADER_SIZE = 41,
00027 TTD_HEADER_SIZE = 49,
00028 };
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 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 ls->failed = true;
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 if (ls->failed) return false;
00125
00126
00127 if (GetOldChunkType(chunk->type) != 0) {
00128 switch (GetOldChunkType(chunk->type)) {
00129
00130 case OC_NULL: ReadByte(ls); break;
00131
00132 case OC_CHUNK:
00133
00134
00135 if (!chunk->proc(ls, i)) return false;
00136 break;
00137
00138 case OC_ASSERT:
00139 DEBUG(oldloader, 4, "Assert point: 0x%X / 0x%X", ls->total_read, chunk->offset + _bump_assert_value);
00140 if (ls->total_read != chunk->offset + _bump_assert_value) ls->failed = true;
00141 default: break;
00142 }
00143 } else {
00144 uint64 res = 0;
00145
00146
00147 switch (GetOldChunkFileType(chunk->type)) {
00148 case OC_FILE_I8: res = (int8)ReadByte(ls); break;
00149 case OC_FILE_U8: res = ReadByte(ls); break;
00150 case OC_FILE_I16: res = (int16)ReadUint16(ls); break;
00151 case OC_FILE_U16: res = ReadUint16(ls); break;
00152 case OC_FILE_I32: res = (int32)ReadUint32(ls); break;
00153 case OC_FILE_U32: res = ReadUint32(ls); break;
00154 default: NOT_REACHED();
00155 }
00156
00157
00158 if (base_ptr == NULL && chunk->ptr == NULL) continue;
00159
00160
00161 if (chunk->ptr == NULL) ptr = base_ptr + chunk->offset;
00162
00163
00164 switch (GetOldChunkVarType(chunk->type)) {
00165 case OC_VAR_I8: *(int8 *)ptr = GB(res, 0, 8); break;
00166 case OC_VAR_U8: *(uint8 *)ptr = GB(res, 0, 8); break;
00167 case OC_VAR_I16:*(int16 *)ptr = GB(res, 0, 16); break;
00168 case OC_VAR_U16:*(uint16*)ptr = GB(res, 0, 16); break;
00169 case OC_VAR_I32:*(int32 *)ptr = res; break;
00170 case OC_VAR_U32:*(uint32*)ptr = res; break;
00171 case OC_VAR_I64:*(int64 *)ptr = res; break;
00172 case OC_VAR_U64:*(uint64*)ptr = res; break;
00173 default: NOT_REACHED();
00174 }
00175
00176
00177 if (chunk->amount > 1 && chunk->ptr != NULL) ptr += CalcOldVarLen(chunk->type);
00178 }
00179 }
00180 }
00181
00182 return true;
00183 }
00184
00190 static void InitLoading(LoadgameState *ls)
00191 {
00192 ls->chunk_size = 0;
00193 ls->total_read = 0;
00194 ls->failed = false;
00195
00196 ls->decoding = false;
00197 ls->decode_char = 0;
00198
00199 ls->buffer_cur = 0;
00200 ls->buffer_count = 0;
00201 memset(ls->buffer, 0, BUFFER_SIZE);
00202
00203 _bump_assert_value = 0;
00204
00205 _settings_game.construction.freeform_edges = false;
00206 }
00207
00215 static bool VerifyOldNameChecksum(char *title, uint len)
00216 {
00217 uint16 sum = 0;
00218 for (uint i = 0; i < len - 2; i++) {
00219 sum += title[i];
00220 sum = ROL(sum, 1);
00221 }
00222
00223 sum ^= 0xAAAA;
00224
00225 uint16 sum2 = title[len - 2];
00226 SB(sum2, 8, 8, title[len - 1]);
00227
00228 return sum == sum2;
00229 }
00230
00231 static inline bool CheckOldSavegameType(FILE *f, char *temp, const char *last, uint len)
00232 {
00233 assert(last - temp + 1 >= (int)len);
00234
00235 if (fread(temp, 1, len, f) != len) {
00236 temp[0] = '\0';
00237 return false;
00238 }
00239
00240 bool ret = VerifyOldNameChecksum(temp, len);
00241 temp[len - 2] = '\0';
00242 str_validate(temp, last);
00243
00244 return ret;
00245 }
00246
00247 static SavegameType DetermineOldSavegameType(FILE *f, char *title, const char *last)
00248 {
00249 assert_compile(TTD_HEADER_SIZE >= TTO_HEADER_SIZE);
00250 char temp[TTD_HEADER_SIZE];
00251
00252 SavegameType type = SGT_TTO;
00253
00254
00255 long pos = ftell(f);
00256 if (!CheckOldSavegameType(f, temp, lastof(temp), TTO_HEADER_SIZE)) {
00257 type = SGT_TTD;
00258 fseek(f, pos, SEEK_SET);
00259 if (!CheckOldSavegameType(f, temp, lastof(temp), TTD_HEADER_SIZE)) {
00260 type = SGT_INVALID;
00261 }
00262 }
00263
00264 if (title != NULL) {
00265 switch (type) {
00266 case SGT_TTO: title = strecpy(title, "(TTO) ", last); break;
00267 case SGT_TTD: title = strecpy(title, "(TTD) ", last); break;
00268 default: title = strecpy(title, "(broken) ", last); break;
00269 }
00270 title = strecpy(title, temp, last);
00271 }
00272
00273 return type;
00274 }
00275
00276 typedef bool LoadOldMainProc(LoadgameState *ls);
00277
00278 bool LoadOldSaveGame(const char *file)
00279 {
00280 LoadgameState ls;
00281
00282 DEBUG(oldloader, 3, "Trying to load a TTD(Patch) savegame");
00283
00284 InitLoading(&ls);
00285
00286
00287 ls.file = FioFOpenFile(file, "rb");
00288
00289 if (ls.file == NULL) {
00290 DEBUG(oldloader, 0, "Cannot open file '%s'", file);
00291 return false;
00292 }
00293
00294 SavegameType type = DetermineOldSavegameType(ls.file, NULL, NULL);
00295
00296 LoadOldMainProc *proc = NULL;
00297
00298 switch (type) {
00299 case SGT_TTO: proc = &LoadTTOMain; break;
00300 case SGT_TTD: proc = &LoadTTDMain; break;
00301 default: break;
00302 }
00303
00304 _savegame_type = type;
00305
00306 if (proc == NULL || !proc(&ls)) {
00307 SetSaveLoadError(STR_GAME_SAVELOAD_ERROR_DATA_INTEGRITY_CHECK_FAILED);
00308 fclose(ls.file);
00309 return false;
00310 }
00311
00312 _pause_mode = 2;
00313
00314 return true;
00315 }
00316
00317 void GetOldSaveGameName(const char *file, char *title, const char *last)
00318 {
00319 FILE *f = FioFOpenFile(file, "rb");
00320
00321 if (f == NULL) {
00322 *title = '\0';
00323 return;
00324 }
00325
00326 DetermineOldSavegameType(f, title, last);
00327
00328 fclose(f);
00329 }