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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 "common/stream.h"
#include "common/substream.h"
#include "adl/disk.h"
namespace Adl {
DiskImage::DiskImage() :
_tracks(0),
_sectorsPerTrack(0),
_bytesPerSector(0) {
_f = new Common::File();
}
DiskImage::~DiskImage() {
delete _f;
}
DiskImageDataBlock::DiskImageDataBlock(const DiskImage *disk, uint track, uint sector, uint offset, uint size) :
_track(track),
_sector(sector),
_offset(offset),
_size(size),
_disk(disk) { }
bool DiskImageDataBlock::isValid() const {
return _track != 0 || _sector != 0 || _offset != 0 || _size != 0;
}
Common::SeekableReadStream *DiskImageDataBlock::createReadStream() const {
return _disk->createReadStream(_track, _sector, _offset, _size);
}
// .DSK disk image - 35 tracks, 16 sectors per track, 256 bytes per sector, raw sector layout
const DataBlockPtr DiskImage_DSK::getDataBlock(uint track, uint sector, uint offset, uint size) const {
return Common::SharedPtr<DiskImageDataBlock>(new DiskImageDataBlock(this, track, sector, offset, size));
}
Common::SeekableReadStream *DiskImage_DSK::createReadStream(uint track, uint sector, uint offset, uint size) const {
_f->seek((track * _sectorsPerTrack + sector) * _bytesPerSector + offset);
Common::SeekableReadStream *stream = _f->readStream(size * _bytesPerSector + _bytesPerSector - offset);
if (_f->eos() || _f->err())
error("Error reading disk image");
return stream;
}
bool DiskImage_DSK::open(const Common::String &filename) {
assert(!_f->isOpen());
if (!_f->open(filename))
return false;
uint filesize = _f->size();
switch (filesize) {
case 143360:
_tracks = 35;
_sectorsPerTrack = 16;
_bytesPerSector = 256;
break;
default:
warning("Unrecognized disk image '%s' of size %d bytes", filename.c_str(), filesize);
}
return true;
}
Common::SeekableReadStream *FilesDataBlock::createReadStream() const {
return _files->createReadStream(_filename, _offset);
}
const DataBlockPtr PlainFiles::getDataBlock(const Common::String &filename, uint offset) const {
return Common::SharedPtr<FilesDataBlock>(new FilesDataBlock(this, filename, offset));
}
Common::SeekableReadStream *PlainFiles::createReadStream(const Common::String &filename, uint offset) const {
Common::File *f(new Common::File());
if (!f->open(filename))
error("Failed to open '%s'", filename.c_str());
if (offset == 0)
return f;
else
return new Common::SeekableSubReadStream(f, offset, f->size(), DisposeAfterUse::YES);
}
} // End of namespace Adl
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