BaseStreamBuffer.hpp

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00001 /*******************************************************************************
00002 * Copyright (C) 2004 Vintela, Inc. All rights reserved.
00003 * Copyright (C) 2005 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 *
00011 *  - Redistributions in binary form must reproduce the above copyright notice,
00012 *    this list of conditions and the following disclaimer in the documentation
00013 *    and/or other materials provided with the distribution.
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00015 *  - Neither the name of Vintela, Inc., Novell, Inc., nor the names of its
00016 *    contributors may be used to endorse or promote products derived from this
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00019 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS''
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00031 
00032 
00038 #ifndef BLOCXX_BASESTREAMBUFFER_HPP_INCLUDE_GUARD_
00039 #define BLOCXX_BASESTREAMBUFFER_HPP_INCLUDE_GUARD_
00040 #include "blocxx/BLOCXX_config.h"
00041 
00042 #ifdef BLOCXX_HAVE_STREAMBUF
00043 #include <streambuf>
00044 #else
00045 #include <streambuf.h>
00046 #endif
00047 
00048 // The classes and functions defined in this file are not meant for general
00049 // use, they are internal implementation details.  They may change at any time.
00050 
00051 namespace BLOCXX_NAMESPACE
00052 {
00053 
00054 const size_t BASE_BUF_SIZE = 256;
00055 const size_t HTTP_BUF_SIZE = 4096;
00056 class BLOCXX_COMMON_API BaseStreamBuffer : public std::streambuf
00057 {
00058 public:
00065    BaseStreamBuffer(size_t bufSize = BASE_BUF_SIZE,
00066          const char* direction = "io");
00067    ~BaseStreamBuffer();
00068 protected:
00069    // for input
00070    int underflow();
00071    //int pbackfail(int c);
00072    // for output
00073    std::streamsize xsputn(const char* s, std::streamsize n);
00074    virtual int overflow(int c);
00075    virtual int sync();
00076    virtual void initBuffers();
00077    virtual void initGetBuffer();
00078    virtual void initPutBuffer();
00079    // meant to be overwritten (at least one of them)
00087    virtual int buffer_to_device(const char* c, int n);
00088    
00098    virtual int buffer_from_device(char* c, int n);
00099 private:
00100    std::streamsize m_bufSize;
00101    char* m_inputBuffer;
00102    char* m_outputBuffer;
00103    int buffer_in();
00104    int buffer_out();
00105    // prohibit copying and assigning
00106    // NO IMPLEMENTATION
00107    BaseStreamBuffer(const BaseStreamBuffer& arg);
00108    BaseStreamBuffer& operator=(const BaseStreamBuffer& arg);
00109 };
00110 
00111 } // end namespace BLOCXX_NAMESPACE
00112 
00113 #endif

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