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using System;
using System.IO;
using System.Threading;
#if NETCOREAPP1_0_OR_GREATER || NET45_OR_GREATER || NETSTANDARD1_0_OR_GREATER
using System.Threading.Tasks;
#endif
namespace Org.BouncyCastle.Utilities.IO
{
public abstract class BaseInputStream
: Stream
{
public sealed override bool CanRead { get { return true; } }
public sealed override bool CanSeek { get { return false; } }
public sealed override bool CanWrite { get { return false; } }
#if NETCOREAPP2_0_OR_GREATER || NETSTANDARD2_1_OR_GREATER
public override void CopyTo(Stream destination, int bufferSize)
{
Streams.CopyTo(this, destination, bufferSize);
}
#endif
#if NETCOREAPP1_0_OR_GREATER || NET45_OR_GREATER || NETSTANDARD1_0_OR_GREATER
public override Task CopyToAsync(Stream destination, int bufferSize, CancellationToken cancellationToken)
{
return Streams.CopyToAsync(this, destination, bufferSize, cancellationToken);
}
#endif
public sealed override void Flush() {}
public sealed override long Length { get { throw new NotSupportedException(); } }
public sealed override long Position
{
get { throw new NotSupportedException(); }
set { throw new NotSupportedException(); }
}
public override int Read(byte[] buffer, int offset, int count)
{
Streams.ValidateBufferArguments(buffer, offset, count);
int pos = 0;
try
{
while (pos < count)
{
int b = ReadByte();
if (b < 0)
break;
buffer[offset + pos++] = (byte)b;
}
}
catch (IOException)
{
if (pos == 0)
throw;
}
return pos;
}
#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
public override int Read(Span<byte> buffer)
{
int count = buffer.Length, pos = 0;
try
{
while (pos < count)
{
int b = ReadByte();
if (b < 0)
break;
buffer[pos++] = (byte)b;
}
}
catch (IOException)
{
if (pos == 0)
throw;
}
return pos;
}
public override ValueTask<int> ReadAsync(Memory<byte> buffer, CancellationToken cancellationToken = default)
{
return Streams.ReadAsync(this, buffer, cancellationToken);
}
#endif
public sealed override long Seek(long offset, SeekOrigin origin) { throw new NotSupportedException(); }
public sealed override void SetLength(long value) { throw new NotSupportedException(); }
public sealed override void Write(byte[] buffer, int offset, int count) { throw new NotSupportedException(); }
#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
// TODO[api] sealed
public override void Write(ReadOnlySpan<byte> buffer) { throw new NotSupportedException(); }
// TODO[api] sealed
public override ValueTask WriteAsync(ReadOnlyMemory<byte> buffer, CancellationToken cancellationToken = default)
{
throw new NotSupportedException();
}
#endif
}
}
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