mirror of https://github.com/CGAL/cgal
146 lines
3.7 KiB
C++
146 lines
3.7 KiB
C++
// Copyright (c) 1997
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// Utrecht University (The Netherlands),
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// ETH Zurich (Switzerland),
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// INRIA Sophia-Antipolis (France),
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// Max-Planck-Institute Saarbruecken (Germany),
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// and Tel-Aviv University (Israel). All rights reserved.
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//
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// This file is part of CGAL (www.cgal.org)
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//
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// $URL$
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// $Id$
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// SPDX-License-Identifier: LGPL-3.0-or-later OR LicenseRef-Commercial
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//
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//
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// Author(s) : Lutz Kettner <kettner@mpi-sb.mpg.de>
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#ifndef CGAL_IO_BINARY_FILE_IO_H
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#define CGAL_IO_BINARY_FILE_IO_H
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#include <CGAL/config.h>
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#include <CGAL/assertions.h>
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#include <iostream>
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#include <cstdint>
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#include <limits>
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namespace CGAL {
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inline void
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I_Binary_write_uinteger32(std::ostream& out, std::uint32_t u) {
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out.write( (char*)(&u), 4);
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}
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// Special function to write size_t in 32b integer to ensure files
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// written by 64b systems are still readable by 32b ones
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inline void
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I_Binary_write_size_t_into_uinteger32 (std::ostream& out, std::size_t s) {
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CGAL_assertion_msg
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(s <= static_cast<std::size_t>((std::numeric_limits<std::uint32_t>::max)()),
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"Trying to write size_t that does not fit in uint32_t");
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I_Binary_write_uinteger32 (out, static_cast<std::uint32_t>(s));
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}
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inline void
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I_Binary_write_integer32(std::ostream& out, std::int32_t i) {
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out.write( (char*)(&i), 4);
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}
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inline void
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I_Binary_write_float32(std::ostream& out, float f) {
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out.write( (char*)(&f), 4);
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}
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inline void
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I_Binary_write_bool(std::ostream& out, bool b) {
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char c = (b ? 1 : 0);
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out.write(&c, 1);
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}
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// Special function to read size_t from 32b integer to ensure files
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inline void
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I_Binary_read_uinteger32(std::istream& is, std::uint32_t& u) {
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is.read( (char*)(&u), 4);
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}
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// written by 64b systems are still readable by 32b ones
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inline void
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I_Binary_read_size_t_from_uinteger32(std::istream& is, std::size_t& s) {
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std::uint32_t s32;
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I_Binary_read_uinteger32 (is, s32);
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s = static_cast<std::size_t>(s32);
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}
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inline void
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I_Binary_read_integer32(std::istream& is, std::int32_t& i) {
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is.read( (char*)(&i), 4);
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}
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inline void
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I_Binary_read_float32(std::istream& is, float& f) {
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is.read( (char*)(&f), 4);
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}
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inline void
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I_Binary_read_bool(std::istream& is, bool& b) {
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char c;
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is.read(&c, 1);
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b = (c != 0);
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}
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inline void
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I_swap_to_big_endian( std::uint32_t& u) {
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(void) u;
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#ifdef CGAL_LITTLE_ENDIAN
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u = ((u >> 24) | (u << 24) | ((u >> 8) & 0xff00) | ((u << 8) & 0xff0000));
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#endif
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}
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inline void
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I_swap_to_big_endian( std::int32_t& i) {
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// We need to use a union instead of the 2 lines below,
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// otherwise we get aliasing issues.
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// std::uint32_t& u = (std::uint32_t&)i;
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// I_swap_to_big_endian( u);
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union {
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std::int32_t in;
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std::uint32_t ui;
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} u;
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u.in = i;
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I_swap_to_big_endian(u.ui);
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i = u.in;
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}
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inline void
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I_swap_to_big_endian( float& f) {
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// We need to use a union instead of the 2 lines below,
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// otherwise we get aliasing issues.
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// std::uint32_t& u = (std::uint32_t&)f;
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// I_swap_to_big_endian( u);
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union {
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std::uint32_t ui;
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float fl;
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} u;
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u.fl = f;
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I_swap_to_big_endian(u.ui);
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f = u.fl;
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}
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inline void
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I_Binary_write_big_endian_integer32(std::ostream& out, std::int32_t i) {
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I_swap_to_big_endian( i);
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out.write( (char*)(&i), 4);
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}
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inline void
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I_Binary_write_big_endian_float32(std::ostream& out, float f) {
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I_swap_to_big_endian( f);
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out.write( (char*)(&f), 4);
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}
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inline void
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I_Binary_read_big_endian_integer32(std::istream& is, std::int32_t& i) {
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is.read( (char*)(&i), 4);
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I_swap_to_big_endian( i);
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}
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inline void
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I_Binary_read_big_endian_float32(std::istream& is, float& f) {
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is.read( (char*)(&f), 4);
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I_swap_to_big_endian( f);
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}
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} //namespace CGAL
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#endif // CGAL_IO_BINARY_FILE_IO_H
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