aboutsummaryrefslogtreecommitdiff
path: root/engines/sci/engine/message.cpp
blob: 49be25d7f182a2686d28fb7ea154694a3f3dfca1 (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
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
/* 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.
 *
 */


#include "sci/engine/message.h"
#include "sci/engine/kernel.h"
#include "sci/engine/seg_manager.h"
#include "sci/util.h"

namespace Sci {

struct MessageRecord {
	MessageTuple tuple;
	MessageTuple refTuple;
	const char *string;
	byte talker;
};

class MessageReader {
public:
	bool init() {
		if (_headerSize > _size)
			return false;

		// Read message count from last word in header
		_messageCount = READ_SCI11ENDIAN_UINT16(_data + _headerSize - 2);

		if (_messageCount * _recordSize + _headerSize > _size)
			return false;

		return true;
	}

	virtual bool findRecord(const MessageTuple &tuple, MessageRecord &record) = 0;

	virtual ~MessageReader() { }

protected:
	MessageReader(const byte *data, uint size, uint headerSize, uint recordSize)
		: _data(data), _size(size), _headerSize(headerSize), _recordSize(recordSize) { }

	const byte *_data;
	const uint _size;
	const uint _headerSize;
	const uint _recordSize;
	uint _messageCount;
};

class MessageReaderV2 : public MessageReader {
public:
	MessageReaderV2(byte *data, uint size) : MessageReader(data, size, 6, 4) { }

	bool findRecord(const MessageTuple &tuple, MessageRecord &record) {
		const byte *recordPtr = _data + _headerSize;

		for (uint i = 0; i < _messageCount; i++) {
			if ((recordPtr[0] == tuple.noun) && (recordPtr[1] == tuple.verb)) {
				record.tuple = tuple;
				record.refTuple = MessageTuple();
				record.talker = 0;
				record.string = (const char *)_data + READ_LE_UINT16(recordPtr + 2);
				return true;
			}
			recordPtr += _recordSize;
		}

		return false;
	}
};

class MessageReaderV3 : public MessageReader {
public:
	MessageReaderV3(byte *data, uint size) : MessageReader(data, size, 8, 10) { }

	bool findRecord(const MessageTuple &tuple, MessageRecord &record) {
		const byte *recordPtr = _data + _headerSize;

		for (uint i = 0; i < _messageCount; i++) {
			if ((recordPtr[0] == tuple.noun) && (recordPtr[1] == tuple.verb)
				&& (recordPtr[2] == tuple.cond) && (recordPtr[3] == tuple.seq)) {
				record.tuple = tuple;
				record.refTuple = MessageTuple();
				record.talker = recordPtr[4];
				record.string = (const char *)_data + READ_LE_UINT16(recordPtr + 5);
				return true;
			}
			recordPtr += _recordSize;
		}

		return false;
	}
};

class MessageReaderV4 : public MessageReader {
public:
	MessageReaderV4(byte *data, uint size) : MessageReader(data, size, 10, 11) { }

	bool findRecord(const MessageTuple &tuple, MessageRecord &record) {
		const byte *recordPtr = _data + _headerSize;

		for (uint i = 0; i < _messageCount; i++) {
			if ((recordPtr[0] == tuple.noun) && (recordPtr[1] == tuple.verb)
				&& (recordPtr[2] == tuple.cond) && (recordPtr[3] == tuple.seq)) {
				record.tuple = tuple;
				record.refTuple = MessageTuple(recordPtr[7], recordPtr[8], recordPtr[9]);
				record.talker = recordPtr[4];
				record.string = (const char *)_data + READ_SCI11ENDIAN_UINT16(recordPtr + 5);
				return true;
			}
			recordPtr += _recordSize;
		}

		return false;
	}
};

#ifdef ENABLE_SCI32
// SCI32 Mac decided to add an extra byte (currently unknown in meaning) between
// the talker and the string...
class MessageReaderV4_MacSCI32 : public MessageReader {
public:
	MessageReaderV4_MacSCI32(byte *data, uint size) : MessageReader(data, size, 10, 12) { }

	bool findRecord(const MessageTuple &tuple, MessageRecord &record) {
		const byte *recordPtr = _data + _headerSize;

		for (uint i = 0; i < _messageCount; i++) {
			if ((recordPtr[0] == tuple.noun) && (recordPtr[1] == tuple.verb)
				&& (recordPtr[2] == tuple.cond) && (recordPtr[3] == tuple.seq)) {
				record.tuple = tuple;
				record.refTuple = MessageTuple(recordPtr[8], recordPtr[9], recordPtr[10]);
				record.talker = recordPtr[4];
				record.string = (const char *)_data + READ_BE_UINT16(recordPtr + 6);
				return true;
			}
			recordPtr += _recordSize;
		}

		return false;
	}
};
#endif

bool MessageState::getRecord(CursorStack &stack, bool recurse, MessageRecord &record) {
	Resource *res = g_sci->getResMan()->findResource(ResourceId(kResourceTypeMessage, stack.getModule()), 0);

	if (!res) {
		warning("Failed to open message resource %d", stack.getModule());
		return false;
	}

	MessageReader *reader;
	int version = READ_SCI11ENDIAN_UINT32(res->data) / 1000;

	switch (version) {
	case 2:
		reader = new MessageReaderV2(res->data, res->size);
		break;
	case 3:
		reader = new MessageReaderV3(res->data, res->size);
		break;
	case 4:
#ifdef ENABLE_SCI32
	case 5: // v5 seems to be compatible with v4
		// SCI32 Mac is different than SCI32 DOS/Win here
		if (g_sci->getPlatform() == Common::kPlatformMacintosh && getSciVersion() >= SCI_VERSION_2_1)
			reader = new MessageReaderV4_MacSCI32(res->data, res->size);
		else
#endif
			reader = new MessageReaderV4(res->data, res->size);
		break;
	default:
		error("Message: unsupported resource version %d", version);
		return false;
	}

	if (!reader->init()) {
		delete reader;

		warning("Message: failed to read resource header");
		return false;
	}

	while (1) {
		MessageTuple &t = stack.top();

		// Fix known incorrect message tuples
		if (g_sci->getGameId() == GID_QFG1VGA && stack.getModule() == 322 &&
			t.noun == 14 && t.verb == 1 && t.cond == 19 && t.seq == 1) {
			// Talking to Kaspar the shopkeeper - bug #3604944
			t.verb = 2;
		}

		if (g_sci->getGameId() == GID_PQ1 && stack.getModule() == 38 &&
			t.noun == 10 && t.verb == 4 && t.cond == 8 && t.seq == 1) {
			// Using the hand icon on Keith in the Blue Room - bug #3605654
			t.cond = 9;
		}

		if (g_sci->getGameId() == GID_PQ1 && stack.getModule() == 38 &&
			t.noun == 10 && t.verb == 1 && t.cond == 0 && t.seq == 1) {
			// Using the eye icon on Keith in the Blue Room - bug #3605654
			t.cond = 13;
		}

		// Fill in known missing message tuples
		if (g_sci->getGameId() == GID_SQ4 && stack.getModule() == 16 &&
			t.noun == 7 && t.verb == 0 && t.cond == 3 && t.seq == 1) {
			// This fixes the error message shown when speech and subtitles are
			// enabled simultaneously in SQ4 - the (very) long dialog when Roger
			// is talking with the aliens is missing - bug #3538416.
			record.tuple = t;
			record.refTuple = MessageTuple();
			record.talker = 7;	// Roger
			// The missing text is just too big to fit in one speech bubble, and
			// if it's added here manually and drawn on screen, it's painted over
			// the entrance in the back where the Sequel Police enters, so it
			// looks very ugly. Perhaps this is why this particular text is missing,
			// as the text shown in this screen is very short (one-liners).
			// Just output an empty string here instead of showing an error.
			record.string = "";
			delete reader;
			return true;
		}

		if (!reader->findRecord(t, record)) {
			// Tuple not found
			if (recurse && (stack.size() > 1)) {
				stack.pop();
				continue;
			}

			delete reader;
			return false;
		}

		if (recurse) {
			MessageTuple &ref = record.refTuple;

			if (ref.noun || ref.verb || ref.cond) {
				t.seq++;
				stack.push(ref);
				continue;
			}
		}

		delete reader;
		return true;
	}
}

int MessageState::getMessage(int module, MessageTuple &t, reg_t buf) {
	_cursorStack.init(module, t);
	return nextMessage(buf);
}

int MessageState::nextMessage(reg_t buf) {
	MessageRecord record;

	if (!buf.isNull()) {
		if (getRecord(_cursorStack, true, record)) {
			outputString(buf, processString(record.string));
			_lastReturned = record.tuple;
			_lastReturnedModule = _cursorStack.getModule();
			_cursorStack.top().seq++;
			return record.talker;
		} else {
			MessageTuple &t = _cursorStack.top();
			outputString(buf, Common::String::format("Msg %d: %d %d %d %d not found", _cursorStack.getModule(), t.noun, t.verb, t.cond, t.seq));
			return 0;
		}
	} else {
		CursorStack stack = _cursorStack;

		if (getRecord(stack, true, record))
			return record.talker;
		else
			return 0;
	}
}

int MessageState::messageSize(int module, MessageTuple &t) {
	CursorStack stack;
	MessageRecord record;

	stack.init(module, t);
	if (getRecord(stack, true, record))
		return strlen(record.string) + 1;
	else
		return 0;
}

bool MessageState::messageRef(int module, const MessageTuple &t, MessageTuple &ref) {
	CursorStack stack;
	MessageRecord record;

	stack.init(module, t);
	if (getRecord(stack, false, record)) {
		ref = record.refTuple;
		return true;
	}

	return false;
}

void MessageState::pushCursorStack() {
	_cursorStackStack.push(_cursorStack);
}

void MessageState::popCursorStack() {
	if (!_cursorStackStack.empty())
		_cursorStack = _cursorStackStack.pop();
	else
		error("Message: attempt to pop from empty stack");
}

int MessageState::hexDigitToInt(char h) {
	if ((h >= 'A') && (h <= 'F'))
		return h - 'A' + 10;

	if ((h >= 'a') && (h <= 'f'))
		return h - 'a' + 10;

	if ((h >= '0') && (h <= '9'))
		return h - '0';

	return -1;
}

bool MessageState::stringHex(Common::String &outStr, const Common::String &inStr, uint &index) {
	// Hex escape sequences of the form \nn, where n is a hex digit
	if (inStr[index] != '\\')
		return false;

	// Check for enough room for a hex escape sequence
	if (index + 2 >= inStr.size())
		return false;

	int digit1 = hexDigitToInt(inStr[index + 1]);
	int digit2 = hexDigitToInt(inStr[index + 2]);

	// Check for hex
	if ((digit1 == -1) || (digit2 == -1))
		return false;

	outStr += digit1 * 16 + digit2;
	index += 3;

	return true;
}

bool MessageState::stringLit(Common::String &outStr, const Common::String &inStr, uint &index) {
	// Literal escape sequences of the form \n
	if (inStr[index] != '\\')
		return false;

	// Check for enough room for a literal escape sequence
	if (index + 1 >= inStr.size())
		return false;

	outStr += inStr[index + 1];
	index += 2;

	return true;
}

bool MessageState::stringStage(Common::String &outstr, const Common::String &inStr, uint &index) {
	// Stage directions of the form (n *), where n is anything but a digit or a lowercase character
	if (inStr[index] != '(')
		return false;

	for (uint i = index + 1; i < inStr.size(); i++) {
		if (inStr[i] == ')') {
			// Stage direction found, skip it
			index = i + 1;

			// Skip trailing white space
			while ((index < inStr.size()) && ((inStr[index] == '\n') || (inStr[index] == '\r') || (inStr[index] == ' ')))
				index++;

			return true;
		}

		// If we find a lowercase character or a digit, it's not a stage direction
		// SCI32 seems to support having digits in stage directions
		if (((inStr[i] >= 'a') && (inStr[i] <= 'z')) || ((inStr[i] >= '0') && (inStr[i] <= '9') && (getSciVersion() < SCI_VERSION_2)))
			return false;
	}

	// We ran into the end of the string without finding a closing bracket
	return false;
}

Common::String MessageState::processString(const char *s) {
	Common::String outStr;
	Common::String inStr = Common::String(s);

	uint index = 0;

	while (index < inStr.size()) {
		// Check for hex escape sequence
		if (stringHex(outStr, inStr, index))
			continue;

		// Check for literal escape sequence
		if (stringLit(outStr, inStr, index))
			continue;

		// Check for stage direction
		if (stringStage(outStr, inStr, index))
			continue;

		// None of the above, copy char
		outStr += inStr[index++];
	}

	return outStr;
}

void MessageState::outputString(reg_t buf, const Common::String &str) {
#ifdef ENABLE_SCI32
	if (getSciVersion() >= SCI_VERSION_2) {
		if (_segMan->getSegmentType(buf.getSegment()) == SEG_TYPE_STRING) {
			SciString *sciString = _segMan->lookupString(buf);
			sciString->setSize(str.size() + 1);
			for (uint32 i = 0; i < str.size(); i++)
				sciString->setValue(i, str.c_str()[i]);
			sciString->setValue(str.size(), 0);
		} else if (_segMan->getSegmentType(buf.getSegment()) == SEG_TYPE_ARRAY) {
			// Happens in the intro of LSL6, we are asked to write the string
			// into an array
			SciArray<reg_t> *sciString = _segMan->lookupArray(buf);
			sciString->setSize(str.size() + 1);
			for (uint32 i = 0; i < str.size(); i++)
				sciString->setValue(i, make_reg(0, str.c_str()[i]));
			sciString->setValue(str.size(), NULL_REG);
		}
	} else {
#endif
		SegmentRef buffer_r = _segMan->dereference(buf);

		if ((unsigned)buffer_r.maxSize >= str.size() + 1) {
			_segMan->strcpy(buf, str.c_str());
		} else {
			// LSL6 sets an exit text here, but the buffer size allocated
			// is too small. Don't display a warning in this case, as we
			// don't use the exit text anyway - bug report #3035533
			if (g_sci->getGameId() == GID_LSL6 && str.hasPrefix("\r\n(c) 1993 Sierra On-Line, Inc")) {
				// LSL6 buggy exit text, don't show warning
			} else {
				warning("Message: buffer %04x:%04x invalid or too small to hold the following text of %i bytes: '%s'", PRINT_REG(buf), str.size() + 1, str.c_str());
			}

			// Set buffer to empty string if possible
			if (buffer_r.maxSize > 0)
				_segMan->strcpy(buf, "");
		}
#ifdef ENABLE_SCI32
	}
#endif
}

void MessageState::lastQuery(int &module, MessageTuple &tuple) {
	module = _lastReturnedModule;
	tuple = _lastReturned;
}

} // End of namespace Sci