Teuchos_FileInputStream.cpp

00001 // @HEADER
00002 // ***********************************************************************
00003 // 
00004 //                    Teuchos: Common Tools Package
00005 //                 Copyright (2004) Sandia Corporation
00006 // 
00007 // Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive
00008 // license for use of this work by or on behalf of the U.S. Government.
00009 // 
00010 // This library is free software; you can redistribute it and/or modify
00011 // it under the terms of the GNU Lesser General Public License as
00012 // published by the Free Software Foundation; either version 2.1 of the
00013 // License, or (at your option) any later version.
00014 //  
00015 // This library is distributed in the hope that it will be useful, but
00016 // WITHOUT ANY WARRANTY; without even the implied warranty of
00017 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00018 // Lesser General Public License for more details.
00019 //  
00020 // You should have received a copy of the GNU Lesser General Public
00021 // License along with this library; if not, write to the Free Software
00022 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
00023 // USA
00024 // Questions? Contact Michael A. Heroux (maherou@sandia.gov) 
00025 // 
00026 // ***********************************************************************
00027 // @HEADER
00028 
00029 #include "Teuchos_FileInputStream.hpp"
00030 #include "Teuchos_TestForException.hpp"
00031 
00032 using namespace Teuchos;
00033 
00034 FileInputStream::FileInputStream(const string& filename)
00035   : XMLInputStream(), file_(fopen(filename.c_str(), "rb"))
00036 {
00037   TEST_FOR_EXCEPTION(file_ == NULL,
00038                      runtime_error,
00039                      "FileInputStream ctor failed to open file: " 
00040                      << filename);
00041 }
00042 
00043 unsigned int FileInputStream::readBytes(unsigned char* const toFill, 
00044                                         const unsigned int maxToRead)
00045 {
00046   if (feof(file_)) return (size_t)0;
00047   int n = ::fread((void*) toFill, sizeof(char), maxToRead, file_);
00048     if (n==0) return (size_t)0; 
00049 
00050   TEST_FOR_EXCEPTION(n < 0 || (n<(int) maxToRead && !feof(file_)),
00051                      runtime_error,
00052                      "FileInputStream::readBytes error");
00053   
00054   return (size_t) n;
00055 }
00056 

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