aboutsummaryrefslogtreecommitdiff
path: root/engines/kyra/saveload.cpp
blob: fe0b168f61c72937e8e880442a2020392ba31dfd (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
/* 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.
 *
 * $URL$
 * $Id$
 *
 */

#include "common/endian.h"
#include "common/savefile.h"
#include "common/system.h"
#include "graphics/thumbnail.h"

#include "kyra/kyra_v1.h"
#include "kyra/util.h"

#define CURRENT_SAVE_VERSION 16

#define GF_FLOPPY  (1 <<  0)
#define GF_TALKIE  (1 <<  1)
#define GF_FMTOWNS (1 <<  2)

namespace Kyra {

KyraEngine_v1::kReadSaveHeaderError KyraEngine_v1::readSaveHeader(Common::SeekableReadStream *in, bool loadThumbnail, SaveHeader &header) {
	uint32 type = in->readUint32BE();
	header.originalSave = false;
	header.oldHeader = false;
	header.flags = 0;
	header.thumbnail = 0;

	if (type == MKID_BE('KYRA') || type == MKID_BE('ARYK')) { // old Kyra1 header ID
		header.gameID = GI_KYRA1;
		header.oldHeader = true;
	} else if (type == MKID_BE('HOFS')) { // old Kyra2 header ID
		header.gameID = GI_KYRA2;
		header.oldHeader = true;
	} else if (type == MKID_BE('WWSV')) {
		header.gameID = in->readByte();
	} else {
		// try checking for original save header
		const int descriptionSize[2] = { 30, 80 };
		char descriptionBuffer[81];

		bool saveOk = false;

		for (uint i = 0; i < ARRAYSIZE(descriptionSize) && !saveOk; ++i) {
			in->seek(0, SEEK_SET);
			in->read(descriptionBuffer, descriptionSize[i]);
			descriptionBuffer[descriptionSize[i]] = 0;

			Util::convertDOSToISO(descriptionBuffer);

			type = in->readUint32BE();
			header.version = in->readUint16LE();
			if (type == MKID_BE('MBL3') && header.version == 100) {
				saveOk = true;
				header.description = descriptionBuffer;
				header.gameID = GI_KYRA2;
				break;
			} else if (type == MKID_BE('MBL4') && header.version == 102) {
				saveOk = true;
				header.description = descriptionBuffer;
				header.gameID = GI_KYRA3;
				break;
			}
		}

		if (saveOk) {
			header.originalSave = true;
			header.description = descriptionBuffer;
			return kRSHENoError;
		} else {
			return kRSHEInvalidType;
		}
	}

	header.version = in->readUint32BE();
	if (header.version > CURRENT_SAVE_VERSION || (header.oldHeader && header.version > 8) || (type == MKID_BE('ARYK') && header.version > 3))
		return kRSHEInvalidVersion;

	// Versions prior to 9 are using a fixed length description field
	if (header.version <= 8) {
		char buffer[31];
		in->read(buffer, 31);
		// WORKAROUND: Old savegames could contain a missing termination 0 at the
		// end so we manually add it.
		buffer[30] = 0;
		header.description = buffer;
	} else {
		header.description = "";
		for (char c = 0; (c = in->readByte()) != 0;)
			header.description += c;
	}

	if (header.version >= 2)
		header.flags = in->readUint32BE();

	if (header.version >= 14) {
		if (loadThumbnail) {
			header.thumbnail = new Graphics::Surface();
			assert(header.thumbnail);
			if (!Graphics::loadThumbnail(*in, *header.thumbnail)) {
				delete header.thumbnail;
				header.thumbnail = 0;
			}
		} else {
			Graphics::skipThumbnailHeader(*in);
		}
	}

	return ((in->err() || in->eos()) ? kRSHEIoError : kRSHENoError);
}

Common::SeekableReadStream *KyraEngine_v1::openSaveForReading(const char *filename, SaveHeader &header) {
	Common::SeekableReadStream *in = 0;
	if (!(in = _saveFileMan->openForLoading(filename)))
		return 0;

	kReadSaveHeaderError errorCode = KyraEngine_v1::readSaveHeader(in, false, header);
	if (errorCode != kRSHENoError) {
		if (errorCode == kRSHEInvalidType)
			warning("No ScummVM Kyra engine savefile header.");
		else if (errorCode == kRSHEInvalidVersion)
			warning("Savegame is not the right version (%u, '%s')", header.version, header.oldHeader ? "true" : "false");
		else if (errorCode == kRSHEIoError)
			warning("Load failed '%s'", filename);

		delete in;
		return 0;
	}

	if (!header.originalSave) {
		if (!header.oldHeader) {
			if (header.gameID != _flags.gameID) {
				warning("Trying to load game state from other game (save game: %u, running game: %u)", header.gameID, _flags.gameID);
				delete in;
				return 0;
			}
		}

		if (header.version < 2) {
			warning("Make sure your savefile was from this version! (too old savefile version to detect that)");
		} else {
			if ((header.flags & GF_FLOPPY) && (_flags.isTalkie || _flags.platform == Common::kPlatformFMTowns || _flags.platform == Common::kPlatformPC98)) {
				warning("Can not load DOS Floppy savefile for this (non DOS Floppy) gameversion");
				delete in;
				return 0;
			} else if ((header.flags & GF_TALKIE) && !(_flags.isTalkie)) {
				warning("Can not load DOS CD-ROM savefile for this (non DOS CD-ROM) gameversion");
				delete in;
				return 0;
			} else if ((header.flags & GF_FMTOWNS) && !(_flags.platform == Common::kPlatformFMTowns || _flags.platform == Common::kPlatformPC98)) {
				warning("Can not load FM-TOWNS/PC98 savefile for this (non FM-TOWNS/PC98) gameversion");
				delete in;
				return 0;
			}
		}
	}

	return in;
}

Common::WriteStream *KyraEngine_v1::openSaveForWriting(const char *filename, const char *saveName, const Graphics::Surface *thumbnail) const {
	if (shouldQuit())
		return 0;

	Common::WriteStream *out = 0;
	if (!(out = _saveFileMan->openForSaving(filename))) {
		warning("Can't create file '%s', game not saved", filename);
		return 0;
	}

	// Savegame version
	out->writeUint32BE(MKID_BE('WWSV'));
	out->writeByte(_flags.gameID);
	out->writeUint32BE(CURRENT_SAVE_VERSION);
	out->write(saveName, strlen(saveName)+1);
	if (_flags.isTalkie)
		out->writeUint32BE(GF_TALKIE);
	else if (_flags.platform == Common::kPlatformFMTowns || _flags.platform == Common::kPlatformPC98)
		out->writeUint32BE(GF_FMTOWNS);
	else
		out->writeUint32BE(GF_FLOPPY);

	if (out->err()) {
		warning("Can't write file '%s'. (Disk full?)", filename);
		delete out;
		return 0;
	}

	Graphics::Surface *genThumbnail = 0;
	if (!thumbnail)
		thumbnail = genThumbnail = generateSaveThumbnail();

	if (thumbnail)
		Graphics::saveThumbnail(*out, *thumbnail);
	else
		Graphics::saveThumbnail(*out);

	if (genThumbnail) {
		genThumbnail->free();
		delete genThumbnail;
	}

	return out;
}

const char *KyraEngine_v1::getSavegameFilename(int num) {
	static Common::String filename;
	filename = getSavegameFilename(_targetName, num);
	return filename.c_str();
}

Common::String KyraEngine_v1::getSavegameFilename(const Common::String &target, int num) {
	assert(num >= 0 && num <= 999);
	return target + Common::String::printf(".%03d", num);
}

bool KyraEngine_v1::saveFileLoadable(int slot) {
	if (slot < 0 || slot > 999)
		return false;

	SaveHeader header;
	Common::SeekableReadStream *in = openSaveForReading(getSavegameFilename(slot), header);

	if (in) {
		delete in;
		return true;
	}

	return false;
}

void KyraEngine_v1::checkAutosave() {
	if (shouldPerformAutoSave(_lastAutosave)) {
		saveGameState(999, "Autosave", 0);
		_lastAutosave = _system->getMillis();
	}
}

void KyraEngine_v1::loadGameStateCheck(int slot) {
	if (loadGameState(slot) != Common::kNoError) {
		const char *filename = getSavegameFilename(slot);
		Common::String errorMessage = "Could not load savegame: '";
		errorMessage += filename;
		errorMessage += "'";

		GUIErrorMessage(errorMessage);
		error("%s", errorMessage.c_str());
	}
}

} // end of namespace Kyra