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// Licensed to the Apache Software Foundation(ASF) under one
// or more contributor license agreements.See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
using System;
using System.Diagnostics;
using System.IO;
using System.Threading;
using System.Threading.Tasks;
namespace Thrift.Transport.Client
{
// ReSharper disable once InconsistentNaming
public class TMemoryBufferTransport : TTransport
{
private bool IsDisposed;
private byte[] Bytes;
private int _bytesUsed;
public TMemoryBufferTransport()
{
Bytes = new byte[2048]; // default size
}
public TMemoryBufferTransport(int initialCapacity)
{
Bytes = new byte[initialCapacity]; // default size
}
public TMemoryBufferTransport(byte[] buf)
{
Bytes = (byte[])buf.Clone();
_bytesUsed = Bytes.Length;
}
public int Position { get; set; }
public int Capacity
{
get
{
Debug.Assert(_bytesUsed <= Bytes.Length);
return Bytes.Length;
}
set
{
Array.Resize(ref Bytes, value);
_bytesUsed = value;
}
}
public int Length
{
get {
Debug.Assert(_bytesUsed <= Bytes.Length);
return _bytesUsed;
}
set {
if ((Bytes.Length < value) || (Bytes.Length > (10 * value)))
Array.Resize(ref Bytes, Math.Max(2048, (int)(value * 1.25)));
_bytesUsed = value;
}
}
public void SetLength(int value)
{
Length = value;
Position = Math.Min(Position, value);
}
public override bool IsOpen => true;
public override async Task OpenAsync(CancellationToken cancellationToken)
{
if (cancellationToken.IsCancellationRequested)
{
await Task.FromCanceled(cancellationToken);
}
}
public override void Close()
{
/** do nothing **/
}
public void Seek(int delta, SeekOrigin origin)
{
int newPos;
switch (origin)
{
case SeekOrigin.Begin:
newPos = delta;
break;
case SeekOrigin.Current:
newPos = Position + delta;
break;
case SeekOrigin.End:
newPos = _bytesUsed + delta;
break;
default:
throw new ArgumentException(nameof(origin));
}
if ((0 > newPos) || (newPos > _bytesUsed))
throw new ArgumentException(nameof(origin));
Position = newPos;
}
public override ValueTask<int> ReadAsync(byte[] buffer, int offset, int length, CancellationToken cancellationToken)
{
var count = Math.Min(Length - Position, length);
Buffer.BlockCopy(Bytes, Position, buffer, offset, count);
Position += count;
return new ValueTask<int>(count);
}
public override Task WriteAsync(byte[] buffer, CancellationToken cancellationToken)
{
return WriteAsync(buffer, 0, buffer.Length, cancellationToken);
}
public override Task WriteAsync(byte[] buffer, int offset, int count, CancellationToken cancellationToken)
{
var free = Length - Position;
Length = Length + count - free;
Buffer.BlockCopy(buffer, offset, Bytes, Position, count);
Position += count;
return Task.CompletedTask;
}
public override async Task FlushAsync(CancellationToken cancellationToken)
{
if (cancellationToken.IsCancellationRequested)
{
await Task.FromCanceled(cancellationToken);
}
}
public byte[] GetBuffer()
{
var retval = new byte[Length];
Buffer.BlockCopy(Bytes, 0, retval, 0, Length);
return retval;
}
internal bool TryGetBuffer(out ArraySegment<byte> bufSegment)
{
bufSegment = new ArraySegment<byte>(Bytes, 0, _bytesUsed);
return true;
}
// IDisposable
protected override void Dispose(bool disposing)
{
if (!IsDisposed)
{
if (disposing)
{
// nothing to do
}
}
IsDisposed = true;
}
}
}
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