PLearn 0.1
pl_fdstream.h
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00001 // -*- C++ -*-
00002 
00003 // PLearn (A C++ Machine Learning Library)
00004 // Copyright (C) 1998 Pascal Vincent
00005 // Copyright (C) 1999-2002 Pascal Vincent, Yoshua Bengio and University of Montreal
00006 // Copyright (C) 2002 Xavier Saint-Mleux <saintmlx@iro.umontreal.ca>
00007 //
00008 
00009 // Redistribution and use in source and binary forms, with or without
00010 // modification, are permitted provided that the following conditions are met:
00011 // 
00012 //  1. Redistributions of source code must retain the above copyright
00013 //     notice, this list of conditions and the following disclaimer.
00014 // 
00015 //  2. Redistributions in binary form must reproduce the above copyright
00016 //     notice, this list of conditions and the following disclaimer in the
00017 //     documentation and/or other materials provided with the distribution.
00018 // 
00019 //  3. The name of the authors may not be used to endorse or promote
00020 //     products derived from this software without specific prior written
00021 //     permission.
00022 // 
00023 // THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
00024 // IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
00025 // OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
00026 // NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
00027 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
00028 // TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
00029 // PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
00030 // LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
00031 // NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
00032 // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00033 // 
00034 // This file is part of the PLearn library. For more information on the PLearn
00035 // library, go to the PLearn Web site at www.plearn.org
00036 
00044 #ifndef pl_fdstream_INC
00045 #define pl_fdstream_INC
00046 
00047 #include <iostream>
00048 #include <plearn/base/PP.h>
00049 
00050 namespace PLearn {
00051 using namespace std;
00052 
00053 const int pl_dftbuflen= 4096;
00054 
00056 class pl_fdstreambuf : public streambuf, public PPointable
00057 {
00058 protected:  
00059     int fd;  
00060     char* inbuf; 
00061     int inbuf_capacity; 
00062   
00063 protected:
00064   
00066     inline void reserveInputBuffer(int buflen)
00067     {
00068         if(buflen>inbuf_capacity)
00069         {
00070             if(inbuf)
00071                 delete[] inbuf;
00072             inbuf = new char[buflen];
00073             inbuf_capacity = buflen;
00074         }
00075     }
00076   
00077     virtual int overflow(int c=EOF);
00078     virtual int underflow();
00079     virtual streamsize showmanyc();
00080     virtual streamsize xsputn(const char* s, streamsize n);
00081     virtual streamsize xsgetn(char* s, streamsize n);
00082     virtual streambuf* setbuf(char* p, int len);
00083     virtual int sync();
00084   
00085 public:
00086     pl_fdstreambuf(int fd_, int inbufsize);
00087     virtual ~pl_fdstreambuf();
00088   
00089 };
00090 
00091 class pl_fdstream: public iostream
00092 {
00093 protected:
00094     char* outbuffer;
00095   
00096 public:
00097   
00098     pl_fdstream()
00099         :iostream(0), outbuffer(0)
00100     {}
00101   
00102     pl_fdstream(int fd, int inbufsize= pl_dftbuflen, int outbufsize= pl_dftbuflen)
00103         :iostream(0), outbuffer(0)
00104     { init(fd, inbufsize, outbufsize); }
00105   
00106     void init(int fd, int inbufsize= pl_dftbuflen, int outbufsize= pl_dftbuflen);
00107   
00109     void attach(int fd);
00110 
00111     ~pl_fdstream();
00112 };
00113 
00114 } // end of namespace PLearn
00115 
00116 #endif //ndef pl_fdstream_INC
00117 
00118 
00119 /*
00120   Local Variables:
00121   mode:c++
00122   c-basic-offset:4
00123   c-file-style:"stroustrup"
00124   c-file-offsets:((innamespace . 0)(inline-open . 0))
00125   indent-tabs-mode:nil
00126   fill-column:79
00127   End:
00128 */
00129 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=79 :
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