Method constructPadFile

ffsengine.cpp:3017–3048

Construction routines

// Construction routines
UINT8 FfsEngine::constructPadFile(const QByteArray &guid, const UINT32 size, const UINT8 revision, const UINT8 erasePolarity, QByteArray & pad)
{
    if (size < sizeof(EFI_FFS_FILE_HEADER) || erasePolarity == ERASE_POLARITY_UNKNOWN)
        return ERR_INVALID_PARAMETER;

    if (size >= 0xFFFFFF) // TODO: large file support
        return ERR_INVALID_PARAMETER;

    pad = QByteArray(size - guid.size(), erasePolarity == ERASE_POLARITY_TRUE ? '\xFF' : '\x00');
    pad.prepend(guid);
    EFI_FFS_FILE_HEADER* header = (EFI_FFS_FILE_HEADER*)pad.data();
    uint32ToUint24(size, header->Size);
    header->Attributes = 0x00;
    header->Type = EFI_FV_FILETYPE_PAD;
    header->State = EFI_FILE_HEADER_CONSTRUCTION | EFI_FILE_HEADER_VALID | EFI_FILE_DATA_VALID;
    // Invert state bits if erase polarity is true
    if (erasePolarity == ERASE_POLARITY_TRUE)
        header->State = ~header->State;

    // Calculate header checksum
    header->IntegrityCheck.Checksum.Header = 0;
    header->IntegrityCheck.Checksum.File = 0;
    header->IntegrityCheck.Checksum.Header = calculateChecksum8((const UINT8*)header, sizeof(EFI_FFS_FILE_HEADER) - 1);

    // Set data checksum
    if (revision == 1)
        header->IntegrityCheck.Checksum.File = FFS_FIXED_CHECKSUM;
    else
        header->IntegrityCheck.Checksum.File = FFS_FIXED_CHECKSUM2;

    return ERR_SUCCESS;
}

UINT8 FfsEngine::reconstructIntelImage(const QModelIndex& index, QByteArray& reconstructed)
{