131 lines
3.1 KiB
C++
131 lines
3.1 KiB
C++
/*
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* This file is part of libgim.
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*
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* libgim is free software: you can redistribute it and/or modify it under the
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* terms of the GNU General Public License as published by the Free Software
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* Foundation, either version 3 of the License, or (at your option) any later
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* version.
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*
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* libgim is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with libgim. If not, see <http://www.gnu.org/licenses/>.
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*
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* Copyright 2010-2014 Danny Robson <danny@nerdcruft.net>
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*/
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#include "io.hpp"
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#include "debug.hpp"
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#include "except.hpp"
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#include <fcntl.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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using util::detail::posix::mapped_file;
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//----------------------------------------------------------------------------
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mapped_file::mapped_file (const boost::filesystem::path &_path, access_t _access):
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m_fd (_path, _access)
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{ load_fd (_access); }
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//----------------------------------------------------------------------------
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mapped_file::~mapped_file () {
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CHECK (m_data != NULL);
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munmap (m_data, m_size);
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}
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//----------------------------------------------------------------------------
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int
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mapped_file::access_to_flags (access_t a) {
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int flags = 0;
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if (a & ACCESS_READ)
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flags |= PROT_READ;
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if (a & ACCESS_WRITE)
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flags |= PROT_WRITE;
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return flags;
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}
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//----------------------------------------------------------------------------
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void
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mapped_file::load_fd (access_t access) {
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struct stat meta;
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if (fstat (m_fd, &meta) < 0)
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throw errno_error ();
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m_size = (size_t)meta.st_size;
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m_data = (uint8_t *)mmap (NULL, m_size, access_to_flags (access), MAP_SHARED, m_fd, 0);
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if (m_data == MAP_FAILED)
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throw errno_error ();
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}
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//----------------------------------------------------------------------------
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size_t
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mapped_file::size (void) const {
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CHECK (m_size > 0);
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CHECK (m_data != NULL);
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return m_size;
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}
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//----------------------------------------------------------------------------
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uint8_t*
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mapped_file::data (void) {
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CHECK (m_size > 0);
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CHECK (m_data != NULL);
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return m_data;
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}
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//----------------------------------------------------------------------------
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const uint8_t*
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mapped_file::data (void) const {
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CHECK (m_size > 0);
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CHECK (m_data != NULL);
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return m_data;
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}
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//----------------------------------------------------------------------------
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uint8_t*
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mapped_file::begin (void) {
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return data ();
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}
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//----------------------------------------------------------------------------
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uint8_t*
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mapped_file::end (void) {
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return data () + size ();
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}
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//----------------------------------------------------------------------------
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const uint8_t*
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mapped_file::cbegin (void) const {
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return data ();
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}
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//----------------------------------------------------------------------------
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const uint8_t*
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mapped_file::cend (void) const {
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return data () + size ();
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}
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