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/* 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
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