binary_file_io.h

很多二维 三维几何计算算法 C++ 类库

// Copyright (c) 1997  Utrecht University (The Netherlands),
// ETH Zurich (Switzerland), Freie Universitaet Berlin (Germany),
// INRIA Sophia-Antipolis (France), Martin-Luther-University Halle-Wittenberg
// (Germany), Max-Planck-Institute Saarbruecken (Germany), RISC Linz (Austria),
// and Tel-Aviv University (Israel).  All rights reserved.
//
// This file is part of CGAL (www.cgal.org); you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public License as
// published by the Free Software Foundation; version 2.1 of the License.
// See the file LICENSE.LGPL distributed with CGAL.
//
// Licensees holding a valid commercial license may use this file in
// accordance with the commercial license agreement provided with the software.
//
// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
//
// $URL: svn+ssh://scm.gforge.inria.fr/svn/cgal/branches/CGAL-3.3-branch/Stream_support/include/CGAL/IO/binary_file_io.h $
// $Id: binary_file_io.h 28567 2006-02-16 14:30:13Z lsaboret $
// 
//
// Author(s)     : Lutz Kettner  <[e-mail]>


#ifndef CGAL_IO_BINARY_FILE_IO_H
#define CGAL_IO_BINARY_FILE_IO_H

#include <CGAL/basic.h>
#include <CGAL/known_bit_size_integers.h>
#include <iostream>

CGAL_BEGIN_NAMESPACE

inline void
I_Binary_write_integer32(std::ostream& out, Integer32 i) {
    out.write( (char*)(&i), 4);
}
inline void
I_Binary_write_float32(std::ostream& out, float f) {
    out.write( (char*)(&f), 4);
}

inline void
I_Binary_read_integer32(std::istream& in, Integer32& i) {
    in.read( (char*)(&i), 4);
}
inline void
I_Binary_read_float32(std::istream& in, float& f) {
    in.read( (char*)(&f), 4);
}

inline void
I_swap_to_big_endian( UInteger32& u) {
    (void) u;
#ifdef CGAL_LITTLE_ENDIAN
    u = ((u >> 24) | (u << 24) | ((u >> 8) & 0xff00) | ((u << 8) & 0xff0000));
#endif
}

inline void
I_swap_to_big_endian( Integer32& i) {
    // We need to use a union instead of the 2 lines below,
    // otherwise we get aliasing issues.
    // UInteger32& u = (UInteger32&)i;
    // I_swap_to_big_endian( u);
    union {
      Integer32  in;
      UInteger32 ui;
    } u;
    u.in = i;
    I_swap_to_big_endian(u.ui);
    i = u.in;
}

inline void
I_swap_to_big_endian( float& f) {
    // We need to use a union instead of the 2 lines below,
    // otherwise we get aliasing issues.
    // UInteger32& u = (UInteger32&)f;
    // I_swap_to_big_endian( u);
    union {
      UInteger32 ui;
      float      fl;
    } u;
    u.fl = f;
    I_swap_to_big_endian(u.ui);
    f = u.fl;
}

inline void
I_Binary_write_big_endian_integer32(std::ostream& out, Integer32 i) {
    I_swap_to_big_endian( i);
    out.write( (char*)(&i), 4);
}
inline void
I_Binary_write_big_endian_float32(std::ostream& out, float f) {
    I_swap_to_big_endian( f);
    out.write( (char*)(&f), 4);
}

inline void
I_Binary_read_big_endian_integer32(std::istream& in, Integer32& i) {
    in.read( (char*)(&i), 4);
    I_swap_to_big_endian( i);
}
inline void
I_Binary_read_big_endian_float32(std::istream& in, float& f) {
    in.read( (char*)(&f), 4);
    I_swap_to_big_endian( f);
}

CGAL_END_NAMESPACE

#endif // CGAL_IO_BINARY_FILE_IO_H