HD.cc

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#include "HD.hh"
#include "FileContext.hh"
#include "FilePool.hh"
#include "DeviceConfig.hh"
#include "CliComm.hh"
#include "HDImageCLI.hh"
#include "MSXMotherBoard.hh"
#include "Reactor.hh"
#include "Display.hh"
#include "GlobalSettings.hh"
#include "MSXException.hh"
#include "Timer.hh"
#include "serialize.hh"
#include "tiger.hh"
#include <cassert>
#include <memory>
 
namespace openmsx {
 
using std::string;
 
HD::HD(const DeviceConfig& config)
        : motherBoard(config.getMotherBoard())
        , name("hdX")
{
        hdInUse = motherBoard.getSharedStuff<HDInUse>("hdInUse");
 
        unsigned id = 0;
        while ((*hdInUse)[id]) {
                ++id;
                if (id == MAX_HD) {
                        throw MSXException("Too many HDs");
                }
        }
        // for exception safety, set hdInUse only at the end
        name[2] = char('a' + id);
 
        // For the initial hd image, savestate should only try exactly this
        // (resolved) filename. For user-specified hd images (commandline or
        // via hda command) savestate will try to re-resolve the filename.
        auto mode = File::NORMAL;
        string cliImage = HDImageCLI::getImageForId(id);
        if (cliImage.empty()) {
                const auto& original = config.getChildData("filename");
                filename = Filename(config.getFileContext().resolveCreate(original));
                mode = File::CREATE;
        } else {
                filename = Filename(std::move(cliImage), userFileContext());
        }
 
        file = File(filename, mode);
        filesize = file.getSize();
        if (mode == File::CREATE && filesize == 0) {
                // OK, the file was just newly created. Now make sure the file
                // is of the right (default) size
                file.truncate(size_t(config.getChildDataAsInt("size", 0)) * 1024 * 1024);
                filesize = file.getSize();
        }
        tigerTree.emplace(*this, filesize, filename.getResolved());
 
        (*hdInUse)[id] = true;
        hdCommand.emplace(
                motherBoard.getCommandController(),
                motherBoard.getStateChangeDistributor(),
                motherBoard.getScheduler(),
                *this,
                motherBoard.getReactor().getGlobalSettings().getPowerSetting());
 
        motherBoard.getMSXCliComm().update(CliComm::HARDWARE, name, "add");
}
 
HD::~HD()
{
        motherBoard.getMSXCliComm().update(CliComm::HARDWARE, name, "remove");
 
        unsigned id = name[2] - 'a';
        assert((*hdInUse)[id]);
        (*hdInUse)[id] = false;
}
 
void HD::switchImage(const Filename& newFilename)
{
        file = File(newFilename);
        filename = newFilename;
        filesize = file.getSize();
        tigerTree.emplace(*this, filesize, filename.getResolved());
        motherBoard.getMSXCliComm().update(CliComm::MEDIA, getName(),
                                           filename.getResolved());
}
 
size_t HD::getNbSectorsImpl() const
{
        return filesize / sizeof(SectorBuffer);
}
 
void HD::readSectorsImpl(
        SectorBuffer* buffers, size_t startSector, size_t num)
{
        file.seek(startSector * sizeof(SectorBuffer));
        file.read(buffers, num * sizeof(SectorBuffer));
}
 
void HD::writeSectorImpl(size_t sector, const SectorBuffer& buf)
{
        file.seek(sector * sizeof(buf));
        file.write(&buf, sizeof(buf));
        tigerTree->notifyChange(sector * sizeof(buf), sizeof(buf),
                                file.getModificationDate());
}
 
bool HD::isWriteProtectedImpl() const
{
        return file.isReadOnly();
}
 
Sha1Sum HD::getSha1SumImpl(FilePool& filePool)
{
        if (hasPatches()) {
                return SectorAccessibleDisk::getSha1SumImpl(filePool);
        }
        return filePool.getSha1Sum(file);
}
 
void HD::showProgress(size_t position, size_t maxPosition)
{
        // only show progress iff:
        //  - 1 second has passed since last progress OR
        //  - we reach completion and did progress before (to show the 100%)
        // This avoids showing any progress if the operation would take less than 1 second.
        auto now = Timer::getTime();
        if (((now - lastProgressTime) > 1000000) ||
            ((position == maxPosition) && everDidProgress)) {
                lastProgressTime = now;
                int percentage = int((100 * position) / maxPosition);
                motherBoard.getMSXCliComm().printProgress(
                        "Calculating hash for ", filename.getResolved(),
                        "... ", percentage, '%');
                motherBoard.getReactor().getDisplay().repaint();
                everDidProgress = true;
        }
}
 
std::string HD::getTigerTreeHash()
{
        lastProgressTime = Timer::getTime();
        everDidProgress = false;
        auto callback = [this](size_t p, size_t t) { showProgress(p, t); };
        return tigerTree->calcHash(callback).toString(); // calls HD::getData()
}
 
uint8_t* HD::getData(size_t offset, size_t size)
{
        assert(size <= TigerTree::BLOCK_SIZE);
        assert((offset % sizeof(SectorBuffer)) == 0);
        assert((size   % sizeof(SectorBuffer)) == 0);
 
        struct Work {
                char extra; // at least one byte before 'bufs'
                // likely here are padding bytes in between
                SectorBuffer bufs[TigerTree::BLOCK_SIZE / sizeof(SectorBuffer)];
        };
        static Work work; // not reentrant
 
        size_t sector = offset / sizeof(SectorBuffer);
        size_t num    = size   / sizeof(SectorBuffer);
        readSectors(work.bufs, sector, num); // This possibly applies IPS patches.
        return work.bufs[0].raw;
}
 
bool HD::isCacheStillValid(time_t& cacheTime)
{
        time_t fileTime = file.getModificationDate();
        bool result = fileTime == cacheTime;
        cacheTime = fileTime;
        return result;
}
 
SectorAccessibleDisk* HD::getSectorAccessibleDisk()
{
        return this;
}
 
std::string_view HD::getContainerName() const
{
        return getName();
}
 
bool HD::diskChanged()
{
        return false; // TODO not implemented
}
 
int HD::insertDisk(const std::string& newFilename)
{
        try {
                switchImage(Filename(newFilename));
                return 0;
        } catch (MSXException&) {
                return -1;
        }
}
 
// version 1: initial version
// version 2: replaced 'checksum'(=sha1) with 'tthsum`
template<typename Archive>
void HD::serialize(Archive& ar, unsigned version)
{
        Filename tmp = file.is_open() ? filename : Filename();
        ar.serialize("filename", tmp);
        if constexpr (Archive::IS_LOADER) {
                if (tmp.empty()) {
                        // Lazily open file specified in config. And close if
                        // it was already opened (in the constructor). The
                        // latter can occur in the following scenario:
                        //  - The hd image doesn't exist yet
                        //  - Reverse creates savestates, these still have
                        //      tmp="" (because file=nullptr)
                        //  - At some later point the hd image gets created
                        //     (e.g. on first access to the image)
                        //  - Now reverse to some point in EmuTime before the
                        //    first disk access
                        //  - The loadstate re-constructs this HD object, but
                        //    because the hd image does exist now, it gets
                        //    opened in the constructor (file!=nullptr).
                        //  - So to get in the same state as the initial
                        //    savestate we again close the file. Otherwise the
                        //    checksum-check code below goes wrong.
                        file.close();
                } else {
                        tmp.updateAfterLoadState();
                        if (filename != tmp) switchImage(tmp);
                        assert(file.is_open());
                }
        }
 
        // store/check checksum
        if (file.is_open()) {
                bool mismatch = false;
 
                if (ar.versionAtLeast(version, 2)) {
                        // use tiger-tree-hash
                        string oldTiger;
                        if constexpr (!Archive::IS_LOADER) {
                                oldTiger = getTigerTreeHash();
                        }
                        ar.serialize("tthsum", oldTiger);
                        if constexpr (Archive::IS_LOADER) {
                                string newTiger = getTigerTreeHash();
                                mismatch = oldTiger != newTiger;
                        }
                } else {
                        // use sha1
                        auto& filepool = motherBoard.getReactor().getFilePool();
                        Sha1Sum oldChecksum;
                        if constexpr (!Archive::IS_LOADER) {
                                oldChecksum = getSha1Sum(filepool);
                        }
                        string oldChecksumStr = oldChecksum.empty()
                                              ? string{}
                                              : oldChecksum.toString();
                        ar.serialize("checksum", oldChecksumStr);
                        oldChecksum = oldChecksumStr.empty()
                                    ? Sha1Sum()
                                    : Sha1Sum(oldChecksumStr);
 
                        if constexpr (Archive::IS_LOADER) {
                                Sha1Sum newChecksum = getSha1Sum(filepool);
                                mismatch = oldChecksum != newChecksum;
                        }
                }
 
                if constexpr (Archive::IS_LOADER) {
                        if (mismatch) {
                                motherBoard.getMSXCliComm().printWarning(
                                        "The content of the harddisk ",
                                        tmp.getResolved(),
                                        " has changed since the time this savestate was "
                                        "created. This might result in emulation problems "
                                        "or even diskcorruption. To prevent the latter, "
                                        "the harddisk is now write-protected.");
                                forceWriteProtect();
                        }
                }
        }
}
INSTANTIATE_SERIALIZE_METHODS(HD);
 
} // namespace openmsx