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/**
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*/
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using System.IO;
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namespace Thrift.Transport
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{
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public class TFramedTransport : TTransport
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{
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protected TTransport transport = null;
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protected MemoryStream writeBuffer = new MemoryStream(1024);
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protected MemoryStream readBuffer = null;
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public class Factory : TTransportFactory
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{
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public override TTransport GetTransport(TTransport trans)
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{
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return new TFramedTransport(trans);
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}
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}
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public TFramedTransport(TTransport transport)
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{
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this.transport = transport;
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}
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public override void Open()
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{
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transport.Open();
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}
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public override bool IsOpen
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{
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get
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{
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return transport.IsOpen;
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}
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}
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public override void Close()
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{
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transport.Close();
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}
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public override int Read(byte[] buf, int off, int len)
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{
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if (readBuffer != null)
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{
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int got = readBuffer.Read(buf, off, len);
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if (got > 0)
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{
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return got;
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}
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}
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// Read another frame of data
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ReadFrame();
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return readBuffer.Read(buf, off, len);
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}
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private void ReadFrame()
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{
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byte[] i32rd = new byte[4];
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transport.ReadAll(i32rd, 0, 4);
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int size =
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((i32rd[0] & 0xff) << 24) |
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((i32rd[1] & 0xff) << 16) |
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((i32rd[2] & 0xff) << 8) |
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((i32rd[3] & 0xff));
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byte[] buff = new byte[size];
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transport.ReadAll(buff, 0, size);
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readBuffer = new MemoryStream(buff);
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}
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public override void Write(byte[] buf, int off, int len)
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{
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writeBuffer.Write(buf, off, len);
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}
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public override void Flush()
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{
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byte[] buf = writeBuffer.GetBuffer();
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int len = (int)writeBuffer.Length;
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writeBuffer = new MemoryStream(writeBuffer.Capacity);
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byte[] i32out = new byte[4];
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i32out[0] = (byte)(0xff & (len >> 24));
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i32out[1] = (byte)(0xff & (len >> 16));
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i32out[2] = (byte)(0xff & (len >> 8));
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i32out[3] = (byte)(0xff & (len));
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transport.Write(i32out, 0, 4);
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transport.Write(buf, 0, len);
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transport.Flush();
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}
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}
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}
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