bool FPackageReader::OpenPackageFile(const FString& InPackageFilename)
{
PackageFilename = InPackageFilename;
Loader = IFileManager::Get().CreateFileReader( *PackageFilename );
if( Loader == NULL )
{
// Couldn't open the file
return false;
}
// Read package file summary from the file
*this << PackageFileSummary;
// Validate the summary.
// Make sure this is indeed a package
if( PackageFileSummary.Tag != PACKAGE_FILE_TAG )
{
// Unrecognized or malformed package file
return false;
}
// Don't read packages that are too old
if( PackageFileSummary.GetFileVersionUE4() < VER_UE4_OLDEST_LOADABLE_PACKAGE )
{
return false;
}
// Don't read packages that were saved with an package version newer than the current one.
if( (PackageFileSummary.GetFileVersionUE4() > GPackageFileUE4Version) || (PackageFileSummary.GetFileVersionLicenseeUE4() > GPackageFileLicenseeUE4Version) )
{
return false;
}
// Check serialized custom versions against latest custom versions.
const FCustomVersionContainer& LatestCustomVersions = FCustomVersionContainer::GetRegistered();
const FCustomVersionSet& PackageCustomVersions = PackageFileSummary.GetCustomVersionContainer().GetAllVersions();
for (const FCustomVersion& SerializedCustomVersion : PackageCustomVersions)
{
auto* LatestVersion = LatestCustomVersions.GetVersion(SerializedCustomVersion.Key);
if (!LatestVersion || SerializedCustomVersion.Version > LatestVersion->Version)
{
return false;
}
}
// check if this is a compressed package and decompress header
if ( !!(PackageFileSummary.PackageFlags & PKG_StoreCompressed) )
{
check(PackageFileSummary.CompressedChunks.Num() > 0);
int64 CurPos = Loader->Tell();
if ( !Loader->SetCompressionMap(&PackageFileSummary.CompressedChunks, (ECompressionFlags)PackageFileSummary.CompressionFlags) )
{
delete Loader;
Loader = new FArchiveAsync(*PackageFilename);
check(!Loader->IsError());
verify(Loader->SetCompressionMap(&PackageFileSummary.CompressedChunks, (ECompressionFlags)PackageFileSummary.CompressionFlags));
}
Seek(Loader->Tell());
}
//make sure the filereader gets the correct version number (it defaults to latest version)
SetUE4Ver(PackageFileSummary.GetFileVersionUE4());
SetLicenseeUE4Ver(PackageFileSummary.GetFileVersionLicenseeUE4());
SetEngineVer(PackageFileSummary.SavedByEngineVersion);
Loader->SetUE4Ver(PackageFileSummary.GetFileVersionUE4());
Loader->SetLicenseeUE4Ver(PackageFileSummary.GetFileVersionLicenseeUE4());
Loader->SetEngineVer(PackageFileSummary.SavedByEngineVersion);
const FCustomVersionContainer& PackageFileSummaryVersions = PackageFileSummary.GetCustomVersionContainer();
SetCustomVersions(PackageFileSummaryVersions);
Loader->SetCustomVersions(PackageFileSummaryVersions);
return true;
}
bool FPackageReader::OpenPackageFile(EOpenPackageResult* OutErrorCode)
{
auto SetPackageErrorCode = [&](const EOpenPackageResult InErrorCode)
{
if (OutErrorCode)
{
*OutErrorCode = InErrorCode;
}
};
if( Loader == NULL )
{
// Couldn't open the file
SetPackageErrorCode(EOpenPackageResult::NoLoader);
return false;
}
// Read package file summary from the file
*this << PackageFileSummary;
// Validate the summary.
// Make sure this is indeed a package
if( PackageFileSummary.Tag != PACKAGE_FILE_TAG )
{
// Unrecognized or malformed package file
SetPackageErrorCode(EOpenPackageResult::MalformedTag);
return false;
}
// Don't read packages that are too old
if( PackageFileSummary.GetFileVersionUE4() < VER_UE4_OLDEST_LOADABLE_PACKAGE )
{
SetPackageErrorCode(EOpenPackageResult::VersionTooOld);
return false;
}
// Don't read packages that were saved with an package version newer than the current one.
if( (PackageFileSummary.GetFileVersionUE4() > GPackageFileUE4Version) || (PackageFileSummary.GetFileVersionLicenseeUE4() > GPackageFileLicenseeUE4Version) )
{
SetPackageErrorCode(EOpenPackageResult::VersionTooNew);
return false;
}
// Check serialized custom versions against latest custom versions.
const FCustomVersionContainer& LatestCustomVersions = FCustomVersionContainer::GetRegistered();
const FCustomVersionSet& PackageCustomVersions = PackageFileSummary.GetCustomVersionContainer().GetAllVersions();
for (const FCustomVersion& SerializedCustomVersion : PackageCustomVersions)
{
auto* LatestVersion = LatestCustomVersions.GetVersion(SerializedCustomVersion.Key);
if (!LatestVersion)
{
SetPackageErrorCode(EOpenPackageResult::CustomVersionMissing);
return false;
}
else if (SerializedCustomVersion.Version > LatestVersion->Version)
{
SetPackageErrorCode(EOpenPackageResult::VersionTooNew);
return false;
}
}
// check if this is a compressed package and decompress header
if ( !!(PackageFileSummary.PackageFlags & PKG_StoreCompressed) )
{
#if USE_NEW_ASYNC_IO
check(!"Package level compression cannot be used with the async io scheme.");
#else
check(PackageFileSummary.CompressedChunks.Num() > 0);
int64 CurPos = Loader->Tell();
if ( !Loader->SetCompressionMap(&PackageFileSummary.CompressedChunks, (ECompressionFlags)PackageFileSummary.CompressionFlags) )
{
delete Loader;
Loader = new FArchiveAsync(*PackageFilename);
check(!Loader->IsError());
verify(Loader->SetCompressionMap(&PackageFileSummary.CompressedChunks, (ECompressionFlags)PackageFileSummary.CompressionFlags));
}
Seek(Loader->Tell());
#endif
}
//make sure the filereader gets the correct version number (it defaults to latest version)
SetUE4Ver(PackageFileSummary.GetFileVersionUE4());
SetLicenseeUE4Ver(PackageFileSummary.GetFileVersionLicenseeUE4());
SetEngineVer(PackageFileSummary.SavedByEngineVersion);
Loader->SetUE4Ver(PackageFileSummary.GetFileVersionUE4());
Loader->SetLicenseeUE4Ver(PackageFileSummary.GetFileVersionLicenseeUE4());
Loader->SetEngineVer(PackageFileSummary.SavedByEngineVersion);
const FCustomVersionContainer& PackageFileSummaryVersions = PackageFileSummary.GetCustomVersionContainer();
SetCustomVersions(PackageFileSummaryVersions);
Loader->SetCustomVersions(PackageFileSummaryVersions);
SetPackageErrorCode(EOpenPackageResult::Success);
return true;
}
