aboutsummaryrefslogtreecommitdiff
path: root/engines/titanic/sound/music_song.cpp
blob: ea5f29a5362fe278a093281f85437e76ed2523ce (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
/* 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 "titanic/sound/music_song.h"
#include "titanic/support/files_manager.h"
#include "titanic/titanic.h"
#include "common/util.h"

namespace Titanic {

CMusicSong::CMusicSong(int index) {
	// Read in the list of song strings
	Common::SeekableReadStream *res = g_vm->_filesManager->getResource("MUSIC/PARSER");
	Common::StringArray parserStrings;
	while (res->pos() < res->size())
		parserStrings.push_back(readStringFromStream(res));
	delete res;

	// Set up a new song parser with the desired string
	CSongParser parser(parserStrings[index].c_str());

	// Count how many encoded values there are
	CValuePair r;
	int count = 0;
	while (parser.parse(r))
		++count;
	assert(count > 0);

	// Read in the values to the array
	_data.resize(count);
	parser.reset();
	for (int idx = 0; idx < count; ++idx)
		parser.parse(_data[idx]);

	// Figure out the range of values in the array
	_minVal = 0x7FFFFFFF;
	int maxVal = -0x7FFFFFFF;

	for (int idx = 0; idx < count; ++idx) {
		CValuePair &vp = _data[idx];
		if (vp._data != 0x7FFFFFFF) {
			if (vp._data < _minVal)
				_minVal = vp._data;
			if (vp._data > maxVal)
				maxVal = vp._data;
		}
	}

	_range = maxVal - _minVal;
}

CMusicSong::~CMusicSong() {
	_data.clear();
}

/*------------------------------------------------------------------------*/

#define FETCH_CHAR _currentChar = _str[_strIndex++]

CSongParser::CSongParser(const char *str) : _str(str), _strIndex(0),
		_field8(0), _priorChar('A'), _field10(32), _field14(0), _flag(false),
		_field1C(0), _currentChar(' '), _numValue(1) {
}

void CSongParser::reset() {
	_strIndex = 0;
	_field8 = 0;
	_field10 = 0;
	_field14 = 0;
	_currentChar = ' ';
	_priorChar = 'A';
	_numValue = 1;
	_field1C = 0;
}

bool CSongParser::parse(CValuePair &r) {
	const int INDEXES[8] = { 0, 2, 3, 5, 7, 8, 10, 0 };

	while (_currentChar) {
		skipSpaces();

		if (Common::isDigit(_currentChar)) {
			// Parse the number
			Common::String numStr;
			do {
				numStr += _currentChar;
				FETCH_CHAR;
			} while (_currentChar && Common::isDigit(_currentChar));

			_numValue = atoi(numStr.c_str());
		} else if (_currentChar == ',') {
			_field10 = _numValue;
			FETCH_CHAR;
		} else if (_currentChar == ':') {
			_priorChar = 'A';
			_field8 = _numValue * 12;
			FETCH_CHAR;
		} else if (_currentChar == '/') {
			r._length += _field10;
			_field1C += _field10;
			FETCH_CHAR;
		} else if (_currentChar == '+') {
			++_field14;
			FETCH_CHAR;
		} else if (_currentChar == '-') {
			--_field14;
			FETCH_CHAR;
		} else if (_currentChar == '^') {
			if (_flag)
				break;
			
			_flag = true;
			r._data = 0x7FFFFFFF;
			r._length = _field10;
			_field14 = 0;
			_field1C += _field10;
			FETCH_CHAR;
		} else if (_currentChar == '|') {
			_field1C = 0;
			FETCH_CHAR;
		} else if (Common::isAlpha(_currentChar)) {
			if (_flag)
				break;

			int val1 = INDEXES[tolower(_currentChar) - 'a'];
			int val2 = INDEXES[tolower(_priorChar) - 'a'];
			bool flag = true;

			if (_currentChar == _priorChar) {
				r._data = _field8;
			} else if (_currentChar >= 'a' && _currentChar <= 'g') {
				val1 -= val2;
				if (val1 >= 0)
					val1 -= 12;
				r._data = _field8 + val1;
			} else if (_currentChar >= 'A' && _currentChar <= 'G') {
				val1 -= val2;
				if (val1 <= 0)
					val1 += 12;
				r._data = _field8 + val1;
			} else {
				flag = false;
			}

			if (flag) {
				r._length = _field10;
				_field1C += _field10;
				_field8 = r._data;
				_priorChar = _currentChar;
				r._data += _field14;
				_field14 = 0;
				_flag = true;
			}

			FETCH_CHAR;
		} else {
			FETCH_CHAR;
		}
	}
	
	if (!_flag)
		return false;

	_flag = false;
	return true;
}

void CSongParser::skipSpaces() {
	while (_currentChar && Common::isSpace(_currentChar)) {
		FETCH_CHAR;
	}
}

} // End of namespace Titanic