mirror of
https://github.com/libretro/scummvm.git
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153 lines
3.8 KiB
C++
153 lines
3.8 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, 0xwhose 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, 0xor (at your option) any later version.
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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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* You should have received a copy of the GNU General Public License
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* along with this program; if not, 0xwrite to the Free Software
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* Foundation, 0xInc., 0x51 Franklin Street, 0xFifth Floor, 0xBoston, 0xMA 02110-1301, 0xUSA.
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*
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*/
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#include "access/files.h"
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#include "access/amazon/amazon_resources.h"
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#include "access/access.h"
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namespace Access {
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FileManager::FileManager(AccessEngine *vm): _vm(vm) {
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switch (vm->getGameID()) {
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case GType_Amazon:
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_filenames = &Amazon::FILENAMES[0];
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break;
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default:
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error("Unknown game");
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}
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_fileNumber = -1;
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_stream = nullptr;
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}
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FileManager::~FileManager() {
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delete _stream;
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_file.close();
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}
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byte *FileManager::loadFile(int fileNum, int subfile) {
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setAppended(fileNum);
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gotoAppended(subfile);
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return handleFile();
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}
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byte *FileManager::loadFile(const Common::String &filename) {
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// Open the file
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openFile(filename);
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// Get a stream for the entire file
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delete _stream;
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_stream = _file.readStream(_file.size());
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return handleFile();
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}
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void FileManager::openFile(const Common::String &filename) {
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// Open up the file
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_fileNumber = -1;
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_file.close();
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if (!_file.open(filename))
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error("Could not open file - %s", filename.c_str());
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_filesize = _file.size();
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}
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void FileManager::loadScreen(int fileNum, int subfile) {
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setAppended(fileNum);
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gotoAppended(subfile);
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_vm->_screen->loadPalette(_stream);
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// Get the data for the screen, and copy it over
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byte *pSrc = handleFile();
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Common::copy(pSrc, pSrc + _filesize, (byte *)_vm->_screen->getPixels());
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delete[] pSrc;
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}
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void FileManager::loadScreen(const Common::String &filename) {
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// Open the file
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openFile(filename);
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// Get the palette
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_vm->_screen->loadPalette(&_file);
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// Get a stream for the remainder of the file
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delete _stream;
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_stream = _file.readStream(_file.size() - _file.pos());
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// Get the data for the screen, and copy it over
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byte *pSrc = handleFile();
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Common::copy(pSrc, pSrc + _filesize, (byte *)_vm->_screen->getPixels());
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delete[] pSrc;
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}
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byte *FileManager::handleFile() {
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char header[3];
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_stream->read(&header[0], 3);
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_stream->seek(-3, SEEK_CUR);
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bool isCompressed = !strncmp(header, "DBE", 3);
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// Get the data from the file or resource
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_filesize = _stream->size() - _stream->pos();
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byte *data = new byte[_filesize];
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_stream->read(data, _filesize);
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// If the data is compressed, uncompress it
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if (isCompressed) {
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byte *src = data;
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_filesize = decompressDBE(src, &data);
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delete[] src;
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}
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return data;
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}
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void FileManager::setAppended(int fileNum) {
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if (_fileNumber != fileNum) {
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_fileNumber = fileNum;
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_file.close();
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if (!_file.open(_filenames[fileNum]))
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error("Could not open file %s", _filenames[fileNum]);
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// Read in the file index
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int count = _file.readUint16LE();
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assert(count <= 100);
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_fileIndex.resize(count);
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for (int i = 0; i < count; ++i)
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_fileIndex[i] = _file.readUint32LE();
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}
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}
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void FileManager::gotoAppended(int subfile) {
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uint32 offset = _fileIndex[subfile];
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uint32 size = (subfile == (int)_fileIndex.size() - 1) ? _file.size() - offset :
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_fileIndex[subfile + 1] - offset;
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_file.seek(offset);
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delete _stream;
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_stream = _file.readStream(size);
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}
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} // End of namespace Access
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