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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, 0xwhose 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, 0xor (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, 0xwrite to the Free Software
* Foundation, 0xInc., 0x51 Franklin Street, 0xFifth Floor, 0xBoston, 0xMA 02110-1301, 0xUSA.
*
*/
#include "common/substream.h"
#include "access/files.h"
#include "access/amazon/amazon_resources.h"
#include "access/martian/martian_resources.h"
#include "access/access.h"
namespace Access {
FileIdent::FileIdent() {
_fileNum = -1;
_subfile = 0;
}
void FileIdent::load(Common::SeekableReadStream &s) {
_fileNum = s.readSint16LE();
_subfile = s.readUint16LE();
}
/*------------------------------------------------------------------------*/
CellIdent::CellIdent(int cell, int fileNum, int subfile) {
_cell = cell;
_fileNum = fileNum;
_subfile = subfile;
}
/*------------------------------------------------------------------------*/
Resource::Resource() {
_stream = nullptr;
_size = 0;
_data = nullptr;
}
Resource::~Resource() {
delete _data;
delete _stream;
}
byte *Resource::data() {
if (_data == nullptr) {
_data = new byte[_size];
_stream->seek(0);
_stream->read(_data, _size);
}
return _data;
}
/*------------------------------------------------------------------------*/
FileManager::FileManager(AccessEngine *vm): _vm(vm) {
switch (vm->getGameID()) {
case GType_Amazon:
_filenames = &Amazon::FILENAMES[0];
break;
case GType_MartianMemorandum:
_filenames = &Martian::FILENAMES[0];
break;
default:
error("Unknown game");
}
_fileNumber = -1;
}
FileManager::~FileManager() {
}
Resource *FileManager::loadFile(int fileNum, int subfile) {
Resource *res = new Resource();
setAppended(res, fileNum);
gotoAppended(res, subfile);
handleFile(res);
return res;
}
Resource *FileManager::loadFile(FileIdent &fileIdent) {
return loadFile(fileIdent._fileNum, fileIdent._subfile);
}
Resource *FileManager::loadFile(const Common::String &filename) {
Resource *res = new Resource();
// Open the file
openFile(res, filename);
// Set up stream for the entire file
res->_size = res->_file.size();
res->_stream = res->_file.readStream(res->_size);
handleFile(res);
return res;
}
bool FileManager::existFile(const Common::String &filename) {
Common::File f;
return f.exists(filename);
}
void FileManager::openFile(Resource *res, const Common::String &filename) {
// Open up the file
_fileNumber = -1;
if (!res->_file.open(filename))
error("Could not open file - %s", filename.c_str());
}
void FileManager::loadScreen(Graphics::Surface *dest, int fileNum, int subfile) {
Resource *res = loadFile(fileNum, subfile);
handleScreen(dest, res);
delete res;
}
void FileManager::handleScreen(Graphics::Surface *dest, Resource *res) {
_vm->_screen->loadPalette(res->_stream);
if (dest != _vm->_screen)
dest->w = _vm->_screen->w;
if (dest->w == dest->pitch) {
res->_stream->read((byte *)dest->getPixels(), dest->w * dest->h);
} else {
for (int y = 0; y < dest->h; ++y) {
byte *pDest = (byte *)dest->getBasePtr(0, y);
res->_stream->read(pDest, dest->w);
}
}
}
void FileManager::loadScreen(int fileNum, int subfile) {
loadScreen(_vm->_screen, fileNum, subfile);
}
void FileManager::loadScreen(const Common::String &filename) {
Resource *res = loadFile(filename);
handleScreen(_vm->_screen, res);
delete res;
}
void FileManager::handleFile(Resource *res) {
char header[3];
res->_stream->read(&header[0], 3);
res->_stream->seek(-3, SEEK_CUR);
bool isCompressed = !strncmp(header, "DBE", 3);
// If the data is compressed, uncompress it and replace the stream
// in the resource with the decompressed one
if (isCompressed) {
// Read in the entire compressed data
byte *src = new byte[res->_size];
res->_stream->read(src, res->_size);
// Decompress the data
res->_size = decompressDBE(src, &res->_data);
// Replace the default resource stream with a stream for the decompressed data
delete res->_stream;
res->_file.close();
res->_stream = new Common::MemoryReadStream(res->_data, res->_size);
delete[] src;
}
}
void FileManager::setAppended(Resource *res, int fileNum) {
// Open the file for access
if (!res->_file.open(_filenames[fileNum]))
error("Could not open file %s", _filenames[fileNum]);
// If a different file has been opened then previously, load it's index
if (_fileNumber != fileNum) {
_fileNumber = fileNum;
// Read in the file index
int count = res->_file.readUint16LE();
assert(count <= 100);
_fileIndex.resize(count);
for (int i = 0; i < count; ++i)
_fileIndex[i] = res->_file.readUint32LE();
}
}
void FileManager::gotoAppended(Resource *res, int subfile) {
uint32 offset = _fileIndex[subfile];
uint32 size = (subfile == (int)_fileIndex.size() - 1) ? res->_file.size() - offset :
_fileIndex[subfile + 1] - offset;
res->_size = size;
res->_stream = new Common::SeekableSubReadStream(&res->_file, offset, offset + size);
}
} // End of namespace Access
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