public override async Task <Stream> OpenStreamAsync(CancellationToken ct, FileAccessMode accessMode, StorageOpenOptions options)
{
Func <Stream> streamBuilder = () => File.Open(Path, FileMode.Open, ToFileAccess(accessMode), ToFileShare(options));
var streamWrapper = new SecurityScopeStreamWrapper(_nsUrl, streamBuilder);
return(streamWrapper);
}
public override IOutputStream GetOutputStreamAt(ulong position)
{
if (!CanWrite)
{
throw new NotSupportedException("The file has not been opened for write.");
}
Func <Stream> streamBuilder = () => File.Open(_url.Path, FileMode.OpenOrCreate, FileAccess.Write, _share);
var securityScopedStream = new SecurityScopeStreamWrapper(_url, streamBuilder);
securityScopedStream.Seek((long)position, SeekOrigin.Begin);
return(new FileOutputStream(securityScopedStream));
}
public static SecurityScoped Create(NSUrl url, FileAccess access, FileShare share)
{
// In order to be able to CloneStream() and Get<Input|Output>Stream(),
// no matter the provided share, we enforce to 'share' the 'access'.
var readWriteAccess = (FileShare)(access & FileAccess.ReadWrite);
share &= ~readWriteAccess;
share |= readWriteAccess;
Func <Stream> streamBuilder = () => File.Open(url.Path, FileMode.OpenOrCreate, access, share);
var securityScopedStream = new SecurityScopeStreamWrapper(url, streamBuilder);
return(new SecurityScoped(securityScopedStream, url, access, share));
}