| /* |
| * Copyright (c) 2019 ARM Limited. |
| * |
| * SPDX-License-Identifier: MIT |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a copy |
| * of this software and associated documentation files (the "Software"), to |
| * deal in the Software without restriction, including without limitation the |
| * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or |
| * sell copies of the Software, and to permit persons to whom the Software is |
| * furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included in all |
| * copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| * SOFTWARE. |
| */ |
| #if !defined(BARE_METAL) |
| |
| #include "arm_compute/core/utils/misc/MMappedFile.h" |
| |
| #include <cstdio> |
| #include <cstring> |
| #include <tuple> |
| |
| #include <fcntl.h> |
| #include <sys/mman.h> |
| #include <sys/stat.h> |
| #include <sys/types.h> |
| #include <unistd.h> |
| |
| namespace arm_compute |
| { |
| namespace utils |
| { |
| namespace mmap_io |
| { |
| namespace |
| { |
| /** File size accessor |
| * |
| * @param[in] filename File to extract its size |
| * |
| * @return A pair of size and status. |
| */ |
| std::pair<size_t, bool> get_file_size(const std::string &filename) |
| { |
| struct stat st; // NOLINT |
| memset(&st, 0, sizeof(struct stat)); |
| if(stat(filename.c_str(), &st) == 0) |
| { |
| return std::make_pair(st.st_size, true); |
| } |
| else |
| { |
| return std::make_pair(0, false); |
| } |
| } |
| |
| /** Get OS page size |
| * |
| * @return Page size |
| */ |
| size_t get_page_size() |
| { |
| return sysconf(_SC_PAGESIZE); |
| } |
| } // namespace |
| |
| MMappedFile::MMappedFile() |
| : _filename(), _file_size(0), _map_size(0), _map_offset(0), _fp(nullptr), _data(nullptr) |
| { |
| } |
| |
| MMappedFile::MMappedFile(std::string filename, size_t size, size_t offset) |
| : _filename(std::move(filename)), _file_size(0), _map_size(size), _map_offset(offset), _fp(nullptr), _data(nullptr) |
| { |
| map(_filename, _map_size, _map_offset); |
| } |
| |
| MMappedFile::~MMappedFile() |
| { |
| release(); |
| } |
| |
| bool MMappedFile::map(const std::string &filename, size_t size, size_t offset) |
| { |
| // Check if file is mapped |
| if(is_mapped()) |
| { |
| return false; |
| } |
| |
| // Open file |
| _fp = fopen(filename.c_str(), "a+be"); |
| if(_fp == nullptr) |
| { |
| return false; |
| } |
| |
| // Extract file descriptor |
| int fd = fileno(_fp); |
| bool status = fd >= 0; |
| if(status) |
| { |
| // Get file size |
| std::tie(_file_size, status) = get_file_size(_filename); |
| |
| if(status) |
| { |
| // Map all file from offset if map size is 0 |
| _map_size = (size == 0) ? _file_size : size; |
| _map_offset = offset; |
| |
| // Check offset mapping |
| if((_map_offset > _file_size) || (_map_offset % get_page_size() != 0)) |
| { |
| status = false; |
| } |
| else |
| { |
| // Truncate to file size |
| if(_map_offset + _map_size > _file_size) |
| { |
| _map_size = _file_size - _map_offset; |
| } |
| |
| // Perform mapping |
| _data = ::mmap(nullptr, _map_size, PROT_WRITE, MAP_SHARED, fd, _map_offset); |
| } |
| } |
| } |
| |
| if(!status) |
| { |
| fclose(_fp); |
| } |
| |
| return status; |
| } |
| |
| void MMappedFile::release() |
| { |
| // Unmap file |
| if(_data != nullptr) |
| { |
| ::munmap(_data, _file_size); |
| _data = nullptr; |
| } |
| |
| // Close file |
| if(_fp != nullptr) |
| { |
| fclose(_fp); |
| _fp = nullptr; |
| } |
| |
| // Clear variables |
| _file_size = 0; |
| _map_size = 0; |
| _map_offset = 0; |
| } |
| |
| unsigned char *MMappedFile::data() |
| { |
| return static_cast<unsigned char *>(_data); |
| } |
| |
| size_t MMappedFile::file_size() const |
| { |
| return _file_size; |
| } |
| |
| size_t MMappedFile::map_size() const |
| { |
| return _map_size; |
| } |
| |
| bool MMappedFile::is_mapped() const |
| { |
| return _data != nullptr; |
| } |
| } // namespace mmap_io |
| } // namespace utils |
| } // namespace arm_compute |
| #endif // !defined(BARE_METAL) |