bytestreamutils.h

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/*
 Copyright (C) 2001-2006, William Joseph.
 All Rights Reserved.

 This file is part of GtkRadiant.

 GtkRadiant is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation; either version 2 of the License, or
 (at your option) any later version.

 GtkRadiant is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with GtkRadiant; if not, write to the Free Software
 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#if !defined(INCLUDED_BYTESTREAMUTILS_H)
#define INCLUDED_BYTESTREAMUTILS_H

#if defined(__GNUC__)

#define _ISOC9X_SOURCE  1
#define _ISOC99_SOURCE  1

#define __USE_ISOC9X    1
#define __USE_ISOC99    1

#include <stdint.h>

#endif

#include <algorithm>

// if C99 is unavailable, fall back to the types most likely to be the right sizes
#if !defined(int16_t)
typedef signed short int16_t;
#endif
#if !defined(uint16_t)
typedef unsigned short uint16_t;
#endif
#if !defined(int32_t)
typedef signed int int32_t;
#endif
#if !defined(uint32_t)
typedef unsigned int uint32_t;
#endif

template<typename InputStreamType, typename Type>
inline void istream_read_little_endian (InputStreamType& istream, Type& value)
{
    istream.read(reinterpret_cast<typename InputStreamType::byte_type*> (&value), sizeof(Type));
#if defined(__BIG_ENDIAN__)
    std::reverse(reinterpret_cast<typename InputStreamType::byte_type*>(&value), reinterpret_cast<typename InputStreamType::byte_type*>(&value) + sizeof(Type));
#endif
}

template<typename InputStreamType, typename Type>
inline void istream_read_big_endian (InputStreamType& istream, Type& value)
{
    istream.read(reinterpret_cast<typename InputStreamType::byte_type*> (&value), sizeof(Type));
#if !defined(__BIG_ENDIAN__)
    std::reverse(reinterpret_cast<typename InputStreamType::byte_type*> (&value),
            reinterpret_cast<typename InputStreamType::byte_type*> (&value) + sizeof(Type));
#endif
}

template<typename InputStreamType>
inline void istream_read_byte (InputStreamType& istream, typename InputStreamType::byte_type& b)
{
    istream.read(&b, 1);
}

template<typename InputStreamType>
inline int16_t istream_read_int16_le (InputStreamType& istream)
{
    int16_t value;
    istream_read_little_endian(istream, value);
    return value;
}

template<typename InputStreamType>
inline uint16_t istream_read_uint16_le (InputStreamType& istream)
{
    uint16_t value;
    istream_read_little_endian(istream, value);
    return value;
}

template<typename InputStreamType>
inline int32_t istream_read_int32_le (InputStreamType& istream)
{
    int32_t value;
    istream_read_little_endian(istream, value);
    return value;
}

template<typename InputStreamType>
inline uint32_t istream_read_uint32_le (InputStreamType& istream)
{
    uint32_t value;
    istream_read_little_endian(istream, value);
    return value;
}

template<typename InputStreamType>
inline float istream_read_float32_le (InputStreamType& istream)
{
    float value;
    istream_read_little_endian(istream, value);
    return value;
}

template<typename InputStreamType>
inline typename InputStreamType::byte_type istream_read_byte (InputStreamType& istream)
{
    typename InputStreamType::byte_type b;
    istream.read(&b, sizeof(typename InputStreamType::byte_type));
    return b;
}

#endif