DiskPartition.cc

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#include "DiskPartition.hh"
#include "DiskImageUtils.hh"
#include "Filename.hh"
#include "strCat.hh"
#include <cassert>
 
namespace openmsx {
 
using namespace DiskImageUtils;
 
[[nodiscard]] static DiskName getDiskName(SectorAccessibleDisk* disk, unsigned partition)
{
        if (auto* dsk = dynamic_cast<Disk*>(disk)) {
                return {dsk->getName().getFilename(),
                        strCat(':', partition)};
        } else {
                return {Filename("dummy")};
        }
}
 
DiskPartition::DiskPartition(SectorAccessibleDisk& disk, unsigned partition,
                             std::shared_ptr<SectorAccessibleDisk> owned_)
        : SectorBasedDisk(getDiskName(&disk, partition))
        , parent(disk)
        , owned(std::move(owned_))
{
        assert(!owned || (owned.get() == &disk));
 
        if (partition == 0) {
                start = 0;
                setNbSectors(disk.getNbSectors());
        } else {
                checkValidPartition(disk, partition); // throws
                SectorBuffer buf;
                disk.readSector(0, buf);
                auto& p = buf.pt.part[31 - partition];
                start = p.start;
                setNbSectors(p.size);
        }
}
 
DiskPartition::DiskPartition(SectorAccessibleDisk& parent_,
                             size_t start_, size_t length)
        : SectorBasedDisk(getDiskName(nullptr, 0))
        , parent(parent_)
        , start(start_)
{
        setNbSectors(length);
}
 
void DiskPartition::readSectorImpl(size_t sector, SectorBuffer& buf)
{
        parent.readSector(start + sector, buf);
}
 
void DiskPartition::writeSectorImpl(size_t sector, const SectorBuffer& buf)
{
        parent.writeSector(start + sector, buf);
}
 
bool DiskPartition::isWriteProtectedImpl() const
{
        return parent.isWriteProtected();
}
 
} // namespace openmsx