128 lines
3.0 KiB
C++
128 lines
3.0 KiB
C++
/*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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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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