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PipeBuffer.h

/***************************************************************
 *
 * Copyright (C) 1990-2007, Condor Team, Computer Sciences Department,
 * University of Wisconsin-Madison, WI.
 * 
 * Licensed 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.
 *
 ***************************************************************/

#ifndef PIPE_BUFFER_H
#define PIPE_BUFFER_H

#include "MyString.h"

/**
 *
 * This class encapsulates a DaemonCore pipe and provides buffering.
 * E.g. it allows you to hold a result read out of the pipe until
 * a full line is read. The getNextLine() and Write() methods are
 * designed to be used in read pipe and write pipe handlers,
 * respectively. Note that an object of this type is to be used
 * either strictly for reading (using getNextLine()) or strictly
 * for writing (using Write()).
 *
 **/

const int PIPE_BUFFER_READAHEAD_SIZE = 1024;

class PipeBuffer {
public:
      PipeBuffer ();
      PipeBuffer (int pipe_end);

      MyString * GetNextLine();
      int Write (const char * toWrite = NULL);

      int getPipeEnd() { return pipe_end; }
      void setPipeEnd(const int _pipe_end) { pipe_end = _pipe_end; }
      const char * getBuffer() { return buffer.Value(); }

      int IsEmpty();
      bool IsError() { return error; }
      bool IsEOF() { return eof; }

protected:
      int pipe_end;
      MyString buffer;

      bool error;
      bool eof;

      bool last_char_was_escape;

      char readahead_buffer[PIPE_BUFFER_READAHEAD_SIZE];
      int readahead_length;
      int readahead_index;
};

#endif

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