binary_i_stream.cpp

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/** @file
 *  @author Bram de Greve (bram@cocamware.com)
 *  @author Tom De Muer (tom@cocamware.com)
 *
 *  *** 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) 2004-2011 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 "lass_common.h"
#include "binary_i_stream.h"
#include "../num/basic_types.h"
#include "../num/num_cast.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()
{
}
 
 
 
BinaryIStream::pos_type BinaryIStream::tellg() const
{
    return doTellg();
}
 
 
 
BinaryIStream& BinaryIStream::seekg(pos_type position)
{
    clear(rdstate() & ~std::ios_base::eofbit); // clear eofbit
    if (good())
    {
        doSeekg(position);
    }   
    return *this;
}
 
 
 
BinaryIStream& BinaryIStream::seekg(off_type offset, std::ios_base::seekdir direction)
{
    clear(rdstate() & ~std::ios_base::eofbit); // clear eofbit
    if (good())
    {
        doSeekg(offset, direction);
    }   
    return *this;
}
 
 
#if !defined(LASS_HAVE_STDINT_H_INT8_T_IS_CHAR)
 
BinaryIStream& BinaryIStream::operator>>( char& x )
{
    return readValue(x);
}
 
#endif
 
 
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)
{
    static_assert(sizeof(num::TintPtr) == sizeof(const void*), "TintPtr must have same size as pointers");
    static_assert(sizeof(num::TintPtr) <= sizeof(num::Tint64), "TintPtr must be no wider than 64-bit");
    num::Tint64 temp;
    *this >> temp;
    if (good())
    {
        num::TintPtr address = static_cast<num::TintPtr>(temp);
        if (temp != static_cast<num::Tint64>(address))
        {
            LASS_THROW("address overflow" << std::hex << temp);
        }
        x = reinterpret_cast<void*>(address);
    }
    return *this;
}
 
 
 
BinaryIStream& BinaryIStream::operator>>( std::string& x )
{
    typedef std::string::size_type size_type;
    num::Tuint64 n;
    *this >> n;
    if (good())
    {
        const size_type length = num::numCast<size_type>(n);
        std::string buffer(length, '\0');
        doRead(&buffer[0], length);
        if (good())
        {
            x = std::move(buffer);
        }
    }
    return *this;
}
 
 
 
#if LASS_HAVE_WCHAR_SUPPORT
 
BinaryIStream& BinaryIStream::operator>>( std::wstring& x )
{
    std::string utf8;
    *this >> utf8;
    if (good())
    {
        util::utf8ToWchar( utf8.data(), utf8.length(), x );
    }
    return *this;
}
 
#endif
 
 
 
/** 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
 */
size_t BinaryIStream::read(void* output, size_t numBytes)
{
    return 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;
}
 
 
}
 
}