blocxx

BaseStreamBuffer.hpp

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00001 /*******************************************************************************
00002 * Copyright (C) 2005, Vintela, Inc. All rights reserved.
00003 * Copyright (C) 2006, Novell, Inc. All rights reserved.
00004 * 
00005 * Redistribution and use in source and binary forms, with or without
00006 * modification, are permitted provided that the following conditions are met:
00007 * 
00008 *     * Redistributions of source code must retain the above copyright notice,
00009 *       this list of conditions and the following disclaimer.
00010 *     * Redistributions in binary form must reproduce the above copyright
00011 *       notice, this list of conditions and the following disclaimer in the
00012 *       documentation and/or other materials provided with the distribution.
00013 *     * Neither the name of 
00014 *       Vintela, Inc., 
00015 *       nor Novell, Inc., 
00016 *       nor the names of its contributors or employees may be used to 
00017 *       endorse or promote products derived from this software without 
00018 *       specific prior written permission.
00019 * 
00020 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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00032 
00033 
00039 #ifndef BLOCXX_BASESTREAMBUFFER_HPP_INCLUDE_GUARD_
00040 #define BLOCXX_BASESTREAMBUFFER_HPP_INCLUDE_GUARD_
00041 #include "blocxx/BLOCXX_config.h"
00042 
00043 #ifdef BLOCXX_HAVE_STREAMBUF
00044 #include <streambuf>
00045 #else
00046 #include <streambuf.h>
00047 #endif
00048 
00049 // The classes and functions defined in this file are not meant for general
00050 // use, they are internal implementation details.  They may change at any time.
00051 
00052 namespace BLOCXX_NAMESPACE
00053 {
00054 
00055 const size_t BASE_BUF_SIZE = 256;
00056 const size_t HTTP_BUF_SIZE = 4096;
00057 class BLOCXX_COMMON_API BaseStreamBuffer : public std::streambuf
00058 {
00059 public:
00060    enum EDirectionFlag
00061    {
00062       E_IN,
00063       E_OUT,
00064       E_IN_OUT
00065    };
00071    BaseStreamBuffer(EDirectionFlag direction, size_t bufSize = BASE_BUF_SIZE);
00072 
00073    ~BaseStreamBuffer();
00074 protected:
00075    // for input
00076    int underflow();
00077    //int pbackfail(int c);
00078    // for output
00079    std::streamsize xsputn(const char* s, std::streamsize n);
00080    virtual int overflow(int c);
00081    virtual int sync();
00082    virtual void initBuffers();
00083    virtual void initGetBuffer();
00084    virtual void initPutBuffer();
00085    // meant to be overwritten (at least one of them)
00093    virtual int buffer_to_device(const char* c, int n);
00094    
00105    virtual int buffer_from_device(char* c, int n);
00106 private:
00107    std::streamsize m_bufSize;
00108    char* m_inputBuffer;
00109    char* m_outputBuffer;
00110    int buffer_in();
00111    int buffer_out();
00112    // prohibit copying and assigning
00113    // NO IMPLEMENTATION
00114    BaseStreamBuffer(const BaseStreamBuffer& arg);
00115    BaseStreamBuffer& operator=(const BaseStreamBuffer& arg);
00116 };
00117 
00118 } // end namespace BLOCXX_NAMESPACE
00119 
00120 #endif