aboutsummaryrefslogtreecommitdiff
path: root/engines/lastexpress/game/savegame.h
blob: 6f0408487fc6e978b99ca476b35eaa0546621928 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.

 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.

 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 */

#ifndef LASTEXPRESS_SAVELOAD_H
#define LASTEXPRESS_SAVELOAD_H

/*
	Savegame format
	---------------

	header: 32 bytes
	    uint32 {4}      - signature: 0x12001200
	    uint32 {4}      - chapter - needs to be [0; 5]
	    uint32 {4}      - time - needs to be >= 32 [1061100; timeMax]
	    uint32 {4}      - ?? needs to be >= 32
	    uint32 {4}      - ?? needs to be = 1
	    uint32 {4}      - Brightness (needs to be [0-6])
	    uint32 {4}      - Volume (needs to be [0-7])
	    uint32 {4}      - ?? needs to be = 9

	Game data Format
	-----------------

	uint32 {4}      - entity
	uint32 {4}      - current time
	uint32 {4}      - time delta (how much a tick is in "real" time)
	uint32 {4}      - time ticks
	uint32 {4}      - scene Index               max: 2500
	byte {1}        - use backup scene
	uint32 {4}      - backup Scene Index 1      max: 2500
	uint32 {4}      - backup Scene Index 2      max: 2500
	uint32 {4}      - selected inventory item   max: 32
	uint32 {4*100*10} - positions (by car)
	uint32 {4*16}   - compartments
	uint32 {4*16}   - compartments ??
	uint32 {4*128}  - game progress
	byte {512}      - game events
	byte {7*32}     - inventory
	byte {5*128}    - objects
	byte {1262*40}  - entities (characters and train entities)

	uint32 {4}      - sound queue state
	uint32 {4}      - ??
	uint32 {4}      - number of sound entries
	byte {count*68} - sound entries

	byte {16*128}   - save point data
	uint32 {4}      - number of save points (max: 128)
	byte {count*16} - save points

	... more unknown stuff

*/

#include "lastexpress/shared.h"

#include "common/savefile.h"
#include "common/serializer.h"
#include "common/memstream.h"

namespace LastExpress {

// Savegame signatures
#define SAVEGAME_SIGNATURE       0x12001200
#define SAVEGAME_ENTRY_SIGNATURE 0xE660E660

class LastExpressEngine;

class SaveLoad {
public:
	SaveLoad(LastExpressEngine *engine);
	~SaveLoad();

	// Init
	void create(GameId id);
	void clear(bool clearStream = false);
	uint32 init(GameId id, bool resetHeaders);

	// Save & Load
	void loadGame(GameId id);
	void loadGame(GameId id, uint32 index);
	void saveGame(SavegameType type, EntityIndex entity, uint32 value);

	void loadVolumeBrightness();
	void saveVolumeBrightness();

	// Getting information
	static bool isSavegamePresent(GameId id);
	static bool isSavegameValid(GameId id);

	bool isGameFinished(uint32 menuIndex, uint32 savegameIndex);

	// Accessors
 	uint32       getTime(uint32 index) { return getEntry(index)->time; }
	ChapterIndex getChapter(uint32 index) { return getEntry(index)->chapter; }
	uint32       getValue(uint32 index) { return getEntry(index)->value; }
	uint32       getLastSavegameTicks() const { return _gameTicksLastSavegame; }

private:
	class SavegameStream : public Common::MemoryWriteStreamDynamic, public Common::SeekableReadStream {
	public:
		SavegameStream() : MemoryWriteStreamDynamic(DisposeAfterUse::YES),
		 _eos(false) {}

		int32 pos() const { return MemoryWriteStreamDynamic::pos(); }
		int32 size() const { return MemoryWriteStreamDynamic::size(); }
		bool seek(int32 offset, int whence = SEEK_SET) { return MemoryWriteStreamDynamic::seek(offset, whence); }
		bool eos() const { return _eos; }
		uint32 read(void *dataPtr, uint32 dataSize) {
			if ((int32)dataSize > size() - pos()) {
				dataSize = size() - pos();
				_eos = true;
			}
			memcpy(dataPtr, getData() + pos(), dataSize);

			seek(dataSize, SEEK_CUR);

			return dataSize;
		}
	private:
		bool _eos;
	};

	LastExpressEngine *_engine;

	struct SavegameMainHeader : Common::Serializable {
		uint32 signature;
		uint32 count;
		uint32 offset;
		uint32 offsetEntry;
		uint32 keepIndex;
		int32 brightness;
		int32 volume;
		uint32 field_1C;

		SavegameMainHeader() {
			signature = SAVEGAME_SIGNATURE;
			count = 0;
			offset = 32;
			offsetEntry = 32;
			keepIndex = 0;
			brightness = 3;
			volume = 7;
			field_1C = 9;
		}

		void saveLoadWithSerializer(Common::Serializer &s) {
			s.syncAsUint32LE(signature);
			s.syncAsUint32LE(count);
			s.syncAsUint32LE(offset);
			s.syncAsUint32LE(offsetEntry);
			s.syncAsUint32LE(keepIndex);
			s.syncAsUint32LE(brightness);
			s.syncAsUint32LE(volume);
			s.syncAsUint32LE(field_1C);
		}

		bool isValid() {
			if (signature != SAVEGAME_SIGNATURE)
				return false;

			/* Check not needed as it can never be < 0
			if (header.chapter < 0)
				return false;*/

			if (offset < 32)
				return false;

			if (offsetEntry < 32)
				return false;

			if (keepIndex != 1 && keepIndex != 0)
				return false;

			if (brightness < 0 || brightness > 6)
				return false;

			if (volume < 0 || volume > 7)
				return false;

			if (field_1C != 9)
				return false;

			return true;
		}
	};

	struct SavegameEntryHeader : Common::Serializable {
		uint32 signature;
		SavegameType type;
		uint32 time;
		int offset;
		ChapterIndex chapter;
		uint32 value;
		int field_18;
		int field_1C;

		SavegameEntryHeader() {
			signature = SAVEGAME_ENTRY_SIGNATURE;
			type = kSavegameTypeIndex;
			time = kTimeNone;
			offset = 0;
			chapter = kChapterAll;
			value = 0;
			field_18 = 0;
			field_1C = 0;
		}

		void saveLoadWithSerializer(Common::Serializer &s) {
			s.syncAsUint32LE(signature);
			s.syncAsUint32LE(type);
			s.syncAsUint32LE(time);
			s.syncAsUint32LE(offset);
			s.syncAsUint32LE(chapter);
			s.syncAsUint32LE(value);
			s.syncAsUint32LE(field_18);
			s.syncAsUint32LE(field_1C);
		}

		bool isValid() {
			if (signature != SAVEGAME_ENTRY_SIGNATURE)
				return false;

			if (type < kSavegameTypeTime || type > kSavegameTypeTickInterval)
				return false;

			if (time < kTimeStartGame || time > kTimeCityConstantinople)
				return false;

			if (offset <= 0 || offset & 15)
				return false;

			/* No check for < 0, as it cannot happen normaly */
			if (chapter == 0)
				return false;

			return true;
		}
	};

	SavegameStream *_savegame;
	Common::Array<SavegameEntryHeader *> _gameHeaders;
	uint32 _gameTicksLastSavegame;

	// Headers
	static bool loadMainHeader(Common::InSaveFile *stream, SavegameMainHeader *header);

	// Entries
	void writeEntry(SavegameType type, EntityIndex entity, uint32 val);
	void readEntry(SavegameType *type, EntityIndex *entity, uint32 *val, bool keepIndex);

	SavegameEntryHeader *getEntry(uint32 index);

	// Opening save files
	static Common::String getFilename(GameId id);
	static Common::InSaveFile  *openForLoading(GameId id);
	static Common::OutSaveFile *openForSaving(GameId id);

	// Savegame stream
	void initStream();
	void loadStream(GameId id);
	void flushStream(GameId id);
};

} // End of namespace LastExpress

#endif // LASTEXPRESS_SAVELOAD_H