Method reconstructVolume

ffsengine.cpp:3339–3711

}

UINT8 FfsEngine::reconstructVolume(const QModelIndex & index, QByteArray & reconstructed)
{
    if (!index.isValid())
        return ERR_SUCCESS;

    UINT8 result;

    // No action
    if (model->action(index) == Actions::NoAction || model->action(index) == Actions::DoNotRebuild) {
        reconstructed = model->header(index).append(model->body(index));
        return ERR_SUCCESS;
    }
    else if (model->action(index) == Actions::Remove) {
        reconstructed.clear();
        return ERR_SUCCESS;
    }
    else if (model->action(index) == Actions::Replace ||
        model->action(index) == Actions::Rebuild) {
        QByteArray header = model->header(index);
        QByteArray body = model->body(index);
        EFI_FIRMWARE_VOLUME_HEADER* volumeHeader = (EFI_FIRMWARE_VOLUME_HEADER*)header.data();

        // Check sanity of HeaderLength
        if (volumeHeader->HeaderLength > header.size()) {
            msg(tr("reconstructVolume: invalid volume header length, reconstruction is not possible"), index);
            return ERR_INVALID_VOLUME;
        }

        // Recalculate volume header checksum
        volumeHeader->Checksum = 0;
        volumeHeader->Checksum = calculateChecksum16((const UINT16*)volumeHeader, volumeHeader->HeaderLength);

        // Get volume size
        UINT32 volumeSize = header.size() + body.size();

        // Reconstruct volume body
        UINT32 freeSpaceOffset = 0;
        if (model->rowCount(index)) {
            reconstructed.clear();
            UINT8 polarity = volumeHeader->Attributes & EFI_FVB_ERASE_POLARITY ? ERASE_POLARITY_TRUE : ERASE_POLARITY_FALSE;
            char empty = volumeHeader->Attributes & EFI_FVB_ERASE_POLARITY ? '\xFF' : '\x00';

            // Calculate volume base for volume
            UINT32 volumeBase;
            QByteArray file;
            bool baseFound = false;

            // Search for VTF
            for (int i = 0; i < model->rowCount(index); i++) {
                file = model->header(index.child(i, 0));
                // VTF found
                if (file.left(sizeof(EFI_GUID)) == EFI_FFS_VOLUME_TOP_FILE_GUID) {
                    baseFound = true;
                    volumeBase = (UINT32)(0x100000000 - volumeSize);
                    break;
                }
            }