binary_i_stream.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_stream.h"
#include "../num/basic_types.h"

// static_cast from TintPtr to pointer gives warning on MSVC, yet both are identical in size [Bramz]
// 
#if LASS_COMPILER_TYPE == LASS_COMPILER_TYPE_MSVC
#   pragma warning(push)
#   pragma warning(disable: 4312) // 'reinterpret_cast' : conversion from 'lass::num::TintPtr' to 'void *' of greater size
#endif

namespace lass
{

namespace io
{

BinaryIStream::BinaryIStream():
    BinaryStreamBase()
{
}



BinaryIStream::~BinaryIStream()
{
}



long BinaryIStream::tellg() const
{
    return doTellg();
}



BinaryIStream& BinaryIStream::seekg(long position)
{
    doSeekg(position, std::ios_base::beg);
    return *this;
}



BinaryIStream& BinaryIStream::seekg(long offset, std::ios_base::seekdir directioin)
{
    doSeekg(offset, directioin);
    return *this;
}



BinaryIStream& BinaryIStream::operator>>( char& x )
{
    return readValue(x);
}



BinaryIStream& BinaryIStream::operator>>( num::Tint8& x )
{
    return readValue(x);
}



BinaryIStream& BinaryIStream::operator>>( num::Tuint8& x )
{
    return readValue(x);
}



BinaryIStream& BinaryIStream::operator>>( num::Tint16& x )
{
    return readValue(x);
}



BinaryIStream& BinaryIStream::operator>>( num::Tuint16& x )
{
    return readValue(x);
}



BinaryIStream& BinaryIStream::operator>>( num::Tint32& x )
{
    return readValue(x);
}



BinaryIStream& BinaryIStream::operator>>( num::Tuint32& x )
{
    return readValue(x);
}



BinaryIStream& BinaryIStream::operator>>( num::Tint64& x )
{
    return readValue(x);
}



BinaryIStream& BinaryIStream::operator>>( num::Tuint64& x )
{
    return readValue(x);
}



BinaryIStream& BinaryIStream::operator>>( num::Tfloat32& x )
{
    return readValue(x);
}



BinaryIStream& BinaryIStream::operator>>( num::Tfloat64& x )
{
    return readValue(x);
}



BinaryIStream& BinaryIStream::operator>>(bool& x)
{
    num::Tuint8 temp;
    *this >> temp;
    if (good())
    {
        x = temp ? true : false;
    }
    return *this;
}



BinaryIStream& BinaryIStream::operator>>(void*& x)
{
    LASS_META_ASSERT(sizeof(num::TintPtr) == sizeof(const void*), TintPtr_should_be_of_pointer_size);
    num::Tint64 temp;
    *this >> temp;
    if (good())
    {
#pragma LASS_FIXME("do something special here if cast causes truncation [Bramz]")
        x = reinterpret_cast<void*>(static_cast<num::TintPtr>(temp));
    }
    return *this;
}



BinaryIStream& BinaryIStream::operator>>( std::string& x )
{
    num::Tuint64 n;
    *this >> n;
    if (good())
    {
        size_t length = static_cast<size_t>(n);
#pragma LASS_FIXME("do something special if there's an overflow [Bramz]")
        LASS_ASSERT(n == static_cast<num::Tuint64>(n));
        std::vector<char> buffer(length + 2, '\0'); // [TDM] null character storage + safety :o)
        doRead(&buffer[0], length);
        if (good())
        {
            x = std::string(&buffer[0]);
        }
    }
    return *this;
}



/** read a number of bytes from stream to buffer
 *
 *  @param iBytes 
 *      pointer to buffer.  Must be able to contain at least @a numBytes bytes.
 *  @param numBytes 
 *      number of bytes to be read
 */
void BinaryIStream::read(void* output, size_t numBytes)
{
    doRead(output, numBytes);
}



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

template <typename T>
BinaryIStream& BinaryIStream::readValue(T& x)
{
    if (good())
    {
        T temp;
        doRead(&temp, sizeof(T));
        if (good())
        {
            x = num::fixEndianness(temp, endianness());
        }
    }
    return *this;
}


}

}