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109 lines
3.2 KiB
C++
109 lines
3.2 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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#include "titanic/true_talk/dialogue_file.h"
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namespace Titanic {
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void DialogueIndexEntry::load(Common::SeekableReadStream &s) {
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_v1 = s.readUint32LE();
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_offset = s.readUint32LE();
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}
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/*------------------------------------------------------------------------*/
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CDialogueFile::CDialogueFile(const CString &filename, uint count) {
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if (!_file.open(filename))
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error("Could not locate dialogue file - %s", filename.c_str());
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_cache.resize(count);
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_file.readUint32LE(); // Skip over file Id
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_index.resize(_file.readUint32LE());
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// Read in the entries
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for (uint idx = 0; idx < _index.size(); ++idx)
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_index[idx].load(_file);
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}
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CDialogueFile::~CDialogueFile() {
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clear();
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}
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void CDialogueFile::clear() {
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_file.close();
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}
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DialogueResource *CDialogueFile::addToCache(int index) {
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if (_index.size() == 0 || index < 0 || index >= (int)_index.size()
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|| _cache.empty())
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return nullptr;
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// Scan cache for a free slot
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uint cacheIndex = 0;
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while (cacheIndex < _cache.size() && _cache[cacheIndex]._active)
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++cacheIndex;
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if (cacheIndex == _cache.size())
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return nullptr;
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DialogueIndexEntry &indexEntry = _index[index];
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DialogueResource &res = _cache[cacheIndex];
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res._active = true;
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res._offset = indexEntry._offset;
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res._bytesRead = 0;
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res._entryPtr = &indexEntry;
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// Figure out the size of the entry
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if (index == ((int)_index.size() - 1)) {
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res._size = _file.size() - indexEntry._offset;
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} else {
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res._size = _index[index + 1]._offset - indexEntry._offset;
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}
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// Return a pointer to the loaded entry
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return &res;
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}
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bool CDialogueFile::closeEntry(DialogueResource *cacheEntry) {
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if (!cacheEntry || !cacheEntry->_active)
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return false;
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cacheEntry->_active = false;
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return true;
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}
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bool CDialogueFile::read(DialogueResource *cacheEntry, byte *buffer, size_t bytesToRead) {
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// Sanity checks that a valid record is passed, and the size can be read
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if (!cacheEntry || !cacheEntry->_active || !bytesToRead
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|| (cacheEntry->_bytesRead + bytesToRead) > cacheEntry->_size)
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return false;
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// Move to the correct position in the file
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_file.seek(cacheEntry->_offset + cacheEntry->_bytesRead);
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bool result = _file.read(buffer, bytesToRead) == bytesToRead;
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cacheEntry->_bytesRead += bytesToRead;
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return result;
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}
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} // End of namespace Titanic
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