PLearn 0.1
PrPStreamBuf.cc
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00001 // -*- C++ -*-
00002 
00003 // PrPStreamBuf.cc
00004 //
00005 // Copyright (C) 2004 Christian Hudon 
00006 // 
00007 // Redistribution and use in source and binary forms, with or without
00008 // modification, are permitted provided that the following conditions are met:
00009 // 
00010 //  1. Redistributions of source code must retain the above copyright
00011 //     notice, this list of conditions and the following disclaimer.
00012 // 
00013 //  2. Redistributions in binary form must reproduce the above copyright
00014 //     notice, this list of conditions and the following disclaimer in the
00015 //     documentation and/or other materials provided with the distribution.
00016 // 
00017 //  3. The name of the authors may not be used to endorse or promote
00018 //     products derived from this software without specific prior written
00019 //     permission.
00020 // 
00021 // THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
00022 // IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
00023 // OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
00024 // NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
00025 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
00026 // TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
00027 // PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
00028 // LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
00029 // NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
00030 // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00031 // 
00032 // This file is part of the PLearn library. For more information on the PLearn
00033 // library, go to the PLearn Web site at www.plearn.org
00034 
00035 /* *******************************************************      
00036  * $Id: PrPStreamBuf.cc 9199 2008-07-03 15:00:12Z nouiz $ 
00037  ******************************************************* */
00038 
00039 // Authors: Christian Hudon
00040 
00044 #include "PrPStreamBuf.h"
00045 #include <plearn/base/PrUtils.h>
00046 #include <nspr/prio.h>
00047 #include <stdio.h>
00048 #include "PStream.h"
00049 
00050 namespace PLearn {
00051 using namespace std;
00052 
00053 PrPStreamBuf::PrPStreamBuf(PRFileDesc* in_, PRFileDesc* out_,
00054                            bool own_in_, bool own_out_)
00055     : PStreamBuf(in_ != 0, out_ != 0, 4096, 4096, default_ungetsize), 
00056       in(in_), out(out_), own_in(own_in_), own_out(own_out_)
00057 {}
00058 
00059 PrPStreamBuf::~PrPStreamBuf()
00060 {
00061     const bool in_and_out_equal = (in == out);
00062     
00063     try {
00064         flush();
00065     }
00066     catch(...)
00067     {
00068         fprintf(stderr,"Could not properly clean up (flush) in destructor of PrPStreamBuf\n");
00069     }
00070     if (in && own_in)
00071     {
00072         PR_Close(in);
00073         in = 0;
00074     }
00075     if (out && own_out)
00076     {
00077         // If "in" and "out" were pointing to the same PRFileDesc,
00078         // don't close it a second time.
00079         if (!in_and_out_equal)
00080             PR_Close(out);
00081         out = 0;
00082     }
00083 }
00084 
00085 PrPStreamBuf::streamsize PrPStreamBuf::read_(char* p, streamsize n)
00086 {
00087     PRInt32 nr= PR_Read(in, p, PRInt32(n));
00088     if(nr < 0)
00089         PLERROR((string("in PrPStreamBuf::read_ : no chars read: ") + getPrErrorString()).c_str());
00090     return nr;
00091 }
00092 
00094 void PrPStreamBuf::write_(const char* p, streamsize n)
00095 {
00096     streamsize nwritten = ::PR_Write(out, p, PRInt32(n));
00097     if (nwritten != n)
00098         PLERROR("In PrPStreamBuf::write_ failed to write the requested number "
00099                 "of bytes: wrote %ld instead of %ld",long(nwritten),long(n));
00100 }
00101   
00102 } // end of namespace PLearn
00103 
00104 
00105 /*
00106   Local Variables:
00107   mode:c++
00108   c-basic-offset:4
00109   c-file-style:"stroustrup"
00110   c-file-offsets:((innamespace . 0)(inline-open . 0))
00111   indent-tabs-mode:nil
00112   fill-column:79
00113   End:
00114 */
00115 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=79 :
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