/// <summary>
/// Initialises a new instance of the FlowbishStream class.
/// </summary>
/// <param name="stream">The base stream.</param>
/// <param name="mode">The mode of operation.</param>
/// <param name="key">The key used for encryption (usually the filename).</param>
/// <param name="leaveOpen">Whether to leave the file open after disposal.</param>
/// <exception cref="ArgumentNullException"/>
/// <exception cref="ArgumentException"/>
/// <exception cref="InvalidDataException"/>
/// <exception cref="IOException"/>
/// <exception cref="ObjectDisposedException"/>
public FlowbishStream(Stream stream, FlowbishStreamMode mode, string key, bool leaveOpen)
{
if (stream == null || key == null)
{
throw new ArgumentNullException(nameof(stream));
}
_key = key;
this.leaveOpen = leaveOpen;
switch (mode)
{
case FlowbishStreamMode.Decipher:
if (!stream.CanRead)
{
throw new ArgumentException(Strings.NotSupported_UnreadableStream, nameof(stream));
}
if (!stream.CanSeek)
{
throw new ArgumentException(Strings.NotSupported_UnseekableStream, nameof(stream));
}
_box = new FlowbishBox(ToUIntArray(key + secret, FlowbishBox.keyUIntLength));
_stream = stream;
_mode = FlowbishStreamMode.Decipher;
ReadHeader();
_avail_in = 0;
_buffer_offset = 0;
InitialiseBuffer();
break;
case FlowbishStreamMode.Encipher:
if (!stream.CanWrite)
{
throw new ArgumentException(Strings.NotSupported_UnwritableStream, nameof(stream));
}
_box = new FlowbishBox(ToUIntArray(key + secret, FlowbishBox.keyUIntLength));
_stream = stream;
_mode = FlowbishStreamMode.Encipher;
_avail_out = 0;
_buffer_offset = 0;
_position = 0;
_length = 0;
try
{
WriteHeader();
}
catch (EncoderFallbackException)
{
throw new ArgumentException(nameof(key));
}
break;
default:
throw new ArgumentException(Strings.ArgumentOutOfRangeException_Enum, nameof(mode));
}
}
/// <summary>
/// Initialises a new instance of the FlowbishStream class.
/// </summary>
/// <param name="stream">The base stream.</param>
/// <param name="mode">The mode of operation.</param>
/// <param name="key">The key used for encryption (usually the filename).</param>
/// <exception cref="ArgumentNullException"/>
/// <exception cref="ArgumentException"/>
///
public FlowbishStream(Stream stream, FlowbishStreamMode mode, string key) : this(stream, mode, key, false)
{
}
