binary_i_file.cpp

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/** @file
 *  @author Bram de Greve (bramz@users.sourceforge.net)
 *  @author Tom De Muer (tomdemuer@users.sourceforge.net)
 *
 *  *** BEGIN LICENSE INFORMATION ***
 *  
 *  The contents of this file are subject to the Common Public Attribution License 
 *  Version 1.0 (the "License"); you may not use this file except in compliance with 
 *  the License. You may obtain a copy of the License at 
 *  http://lass.sourceforge.net/cpal-license. The License is based on the 
 *  Mozilla Public License Version 1.1 but Sections 14 and 15 have been added to cover 
 *  use of software over a computer network and provide for limited attribution for 
 *  the Original Developer. In addition, Exhibit A has been modified to be consistent 
 *  with Exhibit B.
 *  
 *  Software distributed under the License is distributed on an "AS IS" basis, WITHOUT 
 *  WARRANTY OF ANY KIND, either express or implied. See the License for the specific 
 *  language governing rights and limitations under the License.
 *  
 *  The Original Code is LASS - Library of Assembled Shared Sources.
 *  
 *  The Initial Developer of the Original Code is Bram de Greve and Tom De Muer.
 *  The Original Developer is the Initial Developer.
 *  
 *  All portions of the code written by the Initial Developer are:
 *  Copyright (C) 2004-2007 the Initial Developer.
 *  All Rights Reserved.
 *  
 *  Contributor(s):
 *
 *  Alternatively, the contents of this file may be used under the terms of the 
 *  GNU General Public License Version 2 or later (the GPL), in which case the 
 *  provisions of GPL are applicable instead of those above.  If you wish to allow use
 *  of your version of this file only under the terms of the GPL and not to allow 
 *  others to use your version of this file under the CPAL, indicate your decision by 
 *  deleting the provisions above and replace them with the notice and other 
 *  provisions required by the GPL License. If you do not delete the provisions above,
 *  a recipient may use your version of this file under either the CPAL or the GPL.
 *  
 *  *** END LICENSE INFORMATION ***
 */

#include "io_common.h"
#include "binary_i_file.h"
#include "../meta/meta_assert.h"

#include <cstdio>

#if LASS_COMPILER_TYPE == LASS_COMPILER_TYPE_MSVC
#   pragma warning(disable: 4996) // 'fopen': This function or variable may be unsafe
#endif

namespace lass
{

namespace io
{

/** Construct an "empty" closed stream..
 */
BinaryIFile::BinaryIFile():
    BinaryIStream(),
    file_(0)
{
}



/** Construct stream by filename and open it.
 */
BinaryIFile::BinaryIFile( const char* iFileName ):
    BinaryIStream(),
    file_(0)
{
    open(iFileName);
}



/** Construct stream by filename and open it.
 */
BinaryIFile::BinaryIFile( const std::string& iFileName ):
    BinaryIStream(),
    file_(0)
{
    open(iFileName);
}



/** Close stream on destruction.
 */
BinaryIFile::~BinaryIFile()
{
    close();
}



void BinaryIFile::open(const char* iFileName)
{
    close();
    file_ = fopen(iFileName, "rb");
    if (!file_)
    {
        setstate(std::ios_base::failbit);
    }
}



void BinaryIFile::open(const std::string& iFileName)
{
    open(iFileName.c_str());
}



void BinaryIFile::close()
{
    if (is_open())
    {
        const int result = ::fclose( file_ );
        if (result != 0)
        {
            setstate(std::ios_base::failbit);
        }
        file_ = 0;
    }
}

bool BinaryIFile::is_open() const
{
    return file_ != 0;
}



// --- private -------------------------------------------------------------------------------------

long BinaryIFile::doTellg() const
{
    return ::ftell(file_);
}



void BinaryIFile::doSeekg(long iOffset, std::ios_base::seekdir iDirection)
{
    LASS_META_ASSERT(std::ios_base::beg == SEEK_SET, ios_base_beg_is_not_equal_to_SEEK_SET);
    LASS_META_ASSERT(std::ios_base::cur == SEEK_CUR, ios_base_cur_is_not_equal_to_SEEK_CUR);
    LASS_META_ASSERT(std::ios_base::end == SEEK_END, ios_base_end_is_not_equal_to_SEEK_END);

    const int result = ::fseek(file_, iOffset, iDirection);
    if (result != 0)
    {
        setstate(std::ios_base::badbit);
    }
}



void BinaryIFile::doRead(void* oOutput, size_t iNumberOfBytes)
{
    if (!file_)
    {
        setstate(std::ios_base::failbit);
        return;
    }
    if (!good())
    {
        return;
    }
    const size_t bytesRead = ::fread(oOutput, 1, iNumberOfBytes, file_);
    if (bytesRead != iNumberOfBytes)
    {
        setstate(std::ios_base::eofbit);
    }
}



}

}