basic/geometry/IGS/IGS_FileIo.cpp

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#include <assert.h>
#include <direct.h>
#include "IGS_FileIo.h"

//=============================================================================
// Constructor
//
// Description: Constructor
//=============================================================================
IGS_FileIo::IGS_FileIo()
:
        m_Buffer( NULL ),
        m_BufferSize( 0 )
{
}

//=============================================================================
// Copy Constructor
//
// Description: Copy Constructor
//=============================================================================
IGS_FileIo::IGS_FileIo( const IGS_FileIo& right )
{
        assert( false );
}

//=============================================================================
// Destructor
//
// Description: Destructor
//=============================================================================
IGS_FileIo::~IGS_FileIo()
{
        delete[] m_Buffer;
        m_BufferSize = 0;

}

//=============================================================================
// AddObject
//
// Description: Adds and object to the current set of objects to save
//=============================================================================
void IGS_FileIo::AddObject( IGS_Object* addme )
{
        m_Objects.push_back( addme );
}

//=============================================================================
// SaveObjectsToFile
//
// Description: Saves all the objects added to a single file
//=============================================================================
void IGS_FileIo::ClearObjects()
{
        m_Objects.clear();
}

//=============================================================================
// ReallocateBuffer
//
// Description: Reallocates the memorybuffer used to save the files
//=============================================================================
void IGS_FileIo::ReallocateBuffer( const int bufferSize )
{
        delete[] m_Buffer;
        m_Buffer = new char[ bufferSize ];
        m_BufferSize = bufferSize;
}

//=============================================================================
// SaveObjectsToFile
//
// Description: Saves all the objects added to a single file
//=============================================================================
void IGS_FileIo::SaveObjectsToFile( const char* filename )
{
        //determine the size of the buffer that we're going to need
        int bufferSize = 0;
        int i;
        int size = m_Objects.size();
        for( i = 0; i < size; i++ )
        {
                IGS_Object* object = m_Objects[ i ];
                bufferSize += object->BinaryFileSize();
        }

        //allocate the buffer in RAM
        this->ReallocateBuffer( bufferSize );
        char* bufferIndex = m_Buffer;

        //write the objects out to the buffer
        for( i = 0; i < size; i++ )
        {
                IGS_Object* object = m_Objects[ i ];
                object->WriteBinary( bufferIndex );
        }

        //open the file on disk
        FILE* file = ::fopen( filename, "wb" );
        assert( file != NULL );

        //write the buffer into the file
        int written = ::fwrite( m_Buffer, m_BufferSize, 1, file );
        if( written != 1 )
        {
                char directory[ 256 ] = "";
                ::getcwd( directory, 256 );
                assert( written == 1 );
        }

        //close the file
        ::fclose( file );
}

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