private NTStatus OpenFileStream(out Stream stream, string path, FileAccess fileAccess, ShareAccess shareAccess, CreateOptions openOptions)
{
stream = null;
FileShare fileShare = NTFileStoreHelper.ToFileShare(shareAccess);
FileOptions fileOptions = ToFileOptions(openOptions);
string fileShareString = fileShare.ToString().Replace(", ", "|");
string fileOptionsString = ToFileOptionsString(fileOptions);
try
{
stream = m_fileSystem.OpenFile(path, FileMode.Open, fileAccess, fileShare, fileOptions);
}
catch (Exception ex)
{
if (ex is IOException || ex is UnauthorizedAccessException)
{
NTStatus status = ToNTStatus(ex);
Log(Severity.Verbose, "OpenFile: Cannot open '{0}', Access={1}, Share={2}. NTStatus: {3}.", path, fileAccess, fileShareString, status);
return(status);
}
else
{
throw;
}
}
Log(Severity.Information, "OpenFileStream: Opened '{0}', Access={1}, Share={2}, FileOptions={3}", path, fileAccess, fileShareString, fileOptionsString);
return(NTStatus.STATUS_SUCCESS);
}
private NTStatus OpenFileStream(out Stream stream, string path, FileAccess fileAccess, ShareAccess shareAccess, CreateOptions openOptions)
{
stream = null;
// When FILE_OPEN_REPARSE_POINT is specified, the operation should continue normally if the file is not a reparse point.
// FILE_OPEN_REPARSE_POINT is a hint that the caller does not intend to actually read the file, with the exception
// of a file copy operation (where the caller will attempt to simply copy the reparse point).
bool openReparsePoint = (openOptions & CreateOptions.FILE_OPEN_REPARSE_POINT) > 0;
bool disableBuffering = (openOptions & CreateOptions.FILE_NO_INTERMEDIATE_BUFFERING) > 0;
bool buffered = (openOptions & CreateOptions.FILE_SEQUENTIAL_ONLY) > 0 && !disableBuffering && !openReparsePoint;
FileShare fileShare = NTFileStoreHelper.ToFileShare(shareAccess);
string fileShareString = fileShare.ToString().Replace(", ", "|");
try
{
stream = m_fileSystem.OpenFile(path, FileMode.Open, fileAccess, fileShare);
}
catch (Exception ex)
{
NTStatus status = ToNTStatus(ex);
Log(Severity.Verbose, "OpenFile: Cannot open '{0}', Access={1}, Share={2}. NTStatus: {3}.", path, fileAccess, fileShareString, status);
return(status);
}
Log(Severity.Information, "OpenFileStream: Opened '{0}', Access={1}, Share={2}, Buffered={3}", path, fileAccess, fileShareString, buffered);
if (buffered)
{
stream = new PrefetchedStream(stream);
}
return(NTStatus.STATUS_SUCCESS);
}
