DiskFactory.cc

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#include "DiskFactory.hh"
#include "Reactor.hh"
#include "File.hh"
#include "FileContext.hh"
#include "DSKDiskImage.hh"
#include "XSADiskImage.hh"
#include "DMKDiskImage.hh"
#include "RamDSKDiskImage.hh"
#include "DirAsDSK.hh"
#include "DiskPartition.hh"
#include "MSXException.hh"
#include "StringOp.hh"
#include <memory>
#include <stdexcept>
 
using std::string;
 
namespace openmsx {
 
DiskFactory::DiskFactory(Reactor& reactor_)
        : reactor(reactor_)
        , syncDirAsDSKSetting(
                reactor.getCommandController(), "DirAsDSKmode",
                "type of synchronisation between host directory and dir-as-dsk diskimage",
                DirAsDSK::SYNC_FULL, EnumSetting<DirAsDSK::SyncMode>::Map{
                        {"read_only", DirAsDSK::SYNC_READONLY},
                        {"full",      DirAsDSK::SYNC_FULL}})
        , bootSectorSetting(
                reactor.getCommandController(), "bootsector",
                "boot sector type for dir-as-dsk",
                DirAsDSK::BOOTSECTOR_DOS2, EnumSetting<DirAsDSK::BootSectorType>::Map{
                        {"DOS1", DirAsDSK::BOOTSECTOR_DOS1},
                        {"DOS2", DirAsDSK::BOOTSECTOR_DOS2}})
{
}
 
std::unique_ptr<Disk> DiskFactory::createDisk(
        const string& diskImage, DiskChanger& diskChanger)
{
        if (diskImage == "ramdsk") {
                return std::make_unique<RamDSKDiskImage>();
        }
 
        Filename filename(diskImage, userFileContext());
        try {
                // First try DirAsDSK
                return std::make_unique<DirAsDSK>(
                        diskChanger,
                        reactor.getCliComm(),
                        filename,
                        syncDirAsDSKSetting.getEnum(),
                        bootSectorSetting.getEnum());
        } catch (MSXException&) {
                // DirAsDSK didn't work, no problem
        }
        try {
                auto file = std::make_shared<File>(filename, File::PRE_CACHE);
                try {
                        // first try XSA
                        return std::make_unique<XSADiskImage>(filename, *file);
                } catch (MSXException&) {
                        // XSA didn't work, still no problem
                }
                try {
                        // next try dmk
                        file->seek(0);
                        return std::make_unique<DMKDiskImage>(filename, file);
                } catch (MSXException& /*e*/) {
                        // DMK didn't work, still no problem
                }
                // next try normal DSK
                return std::make_unique<DSKDiskImage>(filename, std::move(file));
 
        } catch (MSXException& e) {
                // File could not be opened or (very rare) something is wrong
                // with the DSK image. Try to interpret the filename as
                //    <filename>:<partition-number>
                // Try this last because the ':' character could be
                // part of the filename itself. So only try this if
                // the name could not be interpreted as a valid
                // filename.
                auto pos = diskImage.find_last_of(':');
                if (pos == string::npos) {
                        // does not contain ':', throw previous exception
                        throw;
                }
                std::shared_ptr<SectorAccessibleDisk> wholeDisk;
                try {
                        Filename filename2(diskImage.substr(0, pos));
                        wholeDisk = std::make_shared<DSKDiskImage>(filename2);
                } catch (MSXException&) {
                        // If this fails we still prefer to show the
                        // previous error message, because it's most
                        // likely more descriptive.
                        throw e;
                }
                unsigned num = [&] {
                        auto n = StringOp::stringToBase<10, unsigned>(std::string_view(diskImage).substr(pos + 1));
                        if (!n) {
                                // not a valid partion number, throw previous exception
                                throw e;
                        }
                        return *n;
                }();
                SectorAccessibleDisk& disk = *wholeDisk;
                return std::make_unique<DiskPartition>(disk, num, std::move(wholeDisk));
        }
}
 
} // namespace openmsx