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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/true_talk/dialogue_file.h"
namespace Titanic {
void DialogueIndexEntry::load(Common::SeekableReadStream &s) {
_v1 = s.readUint32LE();
_offset = s.readUint32LE();
}
/*------------------------------------------------------------------------*/
CDialogueFile::CDialogueFile(const CString &filename, uint count) {
if (!_file.open(filename))
error("Could not locate dialogue file - %s", filename.c_str());
_cache.resize(count);
_file.readUint32LE(); // Skip over file Id
_index.resize(_file.readUint32LE());
// Read in the entries
for (uint idx = 0; idx < _index.size(); ++idx)
_index[idx].load(_file);
}
CDialogueFile::~CDialogueFile() {
clear();
}
void CDialogueFile::clear() {
_file.close();
}
DialogueResource *CDialogueFile::addToCache(int index) {
if (_index.size() == 0 || index < 0 || index >= (int)_index.size()
|| _cache.empty())
return nullptr;
// Scan cache for a free slot
uint cacheIndex = 0;
while (cacheIndex < _cache.size() && !_cache[cacheIndex]._active)
++cacheIndex;
if (cacheIndex == _cache.size())
return nullptr;
DialogueIndexEntry &indexEntry = _index[index];
DialogueResource &res = _cache[cacheIndex];
res._active = true;
res._offset = indexEntry._offset;
res._bytesRead = 0;
res._entryPtr = &indexEntry;
// Figure out the size of the entry
if (index == ((int)_index.size() - 1)) {
res._size = _file.size() - indexEntry._offset;
} else {
res._size = _index[index + 1]._offset - indexEntry._offset;
}
// Return a pointer to the loaded entry
return &res;
}
bool CDialogueFile::closeEntry(DialogueResource *cacheEntry) {
if (!cacheEntry || !cacheEntry->_active)
return false;
cacheEntry->_active = false;
return true;
}
bool CDialogueFile::read(DialogueResource *cacheEntry, byte *buffer, size_t bytesToRead) {
// Sanity checks that a valid record is passed, and the size can be read
if (!cacheEntry || !cacheEntry->_active || !bytesToRead
|| (cacheEntry->_bytesRead + bytesToRead) > cacheEntry->_size)
return false;
// Move to the correct position in the file
_file.seek(cacheEntry->_offset + cacheEntry->_bytesRead);
bool result = _file.read(buffer, bytesToRead) == bytesToRead;
cacheEntry->_bytesRead += bytesToRead;
return result;
}
} // End of namespace Titanic
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