620 lines
22 KiB
C++
620 lines
22 KiB
C++
// This file Copyright 2013-2022 Mnemosyne LLC.
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// It may be used under GPLv2 (SPDX: GPL-2.0-only), GPLv3 (SPDX: GPL-3.0-only),
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// or any future license endorsed by Mnemosyne LLC.
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// License text can be found in the licenses/ folder.
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#pragma once
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#include <cstddef> // size_t
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#include <cstdint> // uint64_t
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#include <ctime> // time_t
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#include <optional>
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#include <string>
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#include <string_view>
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#ifdef _WIN32
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#include <windows.h>
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#endif
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#include "tr-macros.h"
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struct tr_error;
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/**
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* @addtogroup file_io File IO
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* @{
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*/
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#ifndef _WIN32
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/** @brief Platform-specific file descriptor type. */
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using tr_sys_file_t = int;
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/** @brief Platform-specific invalid file descriptor constant. */
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#define TR_BAD_SYS_FILE (-1)
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/** @brief Platform-specific directory descriptor type. */
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using tr_sys_dir_t = void*;
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/** @brief Platform-specific end-of-line sequence. */
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#define TR_NATIVE_EOL_STR "\n"
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/** @brief Platform-specific end-of-line sequence length. */
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#define TR_NATIVE_EOL_STR_SIZE 1
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#else
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using tr_sys_file_t = HANDLE;
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#define TR_BAD_SYS_FILE INVALID_HANDLE_VALUE
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struct tr_sys_dir_win32;
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using tr_sys_dir_t = tr_sys_dir_win32*;
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#define TR_NATIVE_EOL_STR "\r\n"
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#define TR_NATIVE_EOL_STR_SIZE 2
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#endif
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/** @brief Platform-specific invalid directory descriptor constant. */
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#define TR_BAD_SYS_DIR ((tr_sys_dir_t) nullptr)
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enum tr_std_sys_file_t
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{
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TR_STD_SYS_FILE_IN,
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TR_STD_SYS_FILE_OUT,
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TR_STD_SYS_FILE_ERR
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};
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enum tr_sys_file_open_flags_t
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{
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TR_SYS_FILE_READ = (1 << 0),
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TR_SYS_FILE_WRITE = (1 << 1),
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TR_SYS_FILE_CREATE = (1 << 2),
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TR_SYS_FILE_APPEND = (1 << 3),
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TR_SYS_FILE_TRUNCATE = (1 << 4),
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TR_SYS_FILE_SEQUENTIAL = (1 << 5)
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};
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enum tr_sys_file_lock_flags_t
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{
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TR_SYS_FILE_LOCK_SH = (1 << 0),
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TR_SYS_FILE_LOCK_EX = (1 << 1),
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TR_SYS_FILE_LOCK_NB = (1 << 2),
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TR_SYS_FILE_LOCK_UN = (1 << 3)
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};
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enum tr_sys_path_get_info_flags_t
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{
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TR_SYS_PATH_NO_FOLLOW = (1 << 0)
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};
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enum tr_sys_file_advice_t
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{
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TR_SYS_FILE_ADVICE_WILL_NEED,
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TR_SYS_FILE_ADVICE_DONT_NEED
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};
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enum tr_sys_file_preallocate_flags_t
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{
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TR_SYS_FILE_PREALLOC_SPARSE = (1 << 0)
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};
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enum tr_sys_dir_create_flags_t
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{
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TR_SYS_DIR_CREATE_PARENTS = (1 << 0)
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};
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enum tr_sys_path_type_t
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{
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TR_SYS_PATH_IS_FILE,
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TR_SYS_PATH_IS_DIRECTORY,
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TR_SYS_PATH_IS_OTHER
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};
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struct tr_sys_path_info
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{
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tr_sys_path_type_t type = {};
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uint64_t size = {};
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time_t last_modified_at = {};
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[[nodiscard]] constexpr auto isFile() const noexcept
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{
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return type == TR_SYS_PATH_IS_FILE;
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}
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[[nodiscard]] constexpr auto isFolder() const noexcept
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{
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return type == TR_SYS_PATH_IS_DIRECTORY;
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}
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};
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/**
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* @name Platform-specific wrapper functions
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*
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* Following functions accept paths in UTF-8 encoding and convert them to native
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* encoding internally if needed.
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* Descriptors returned (@ref tr_sys_file_t and @ref tr_sys_dir_t) may have
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* different type depending on platform and should generally not be passed to
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* native functions, but to wrapper functions instead.
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*
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* @{
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*/
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/* Path-related wrappers */
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/**
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* @brief Portability wrapper for various in-kernel file copy functions, with a
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* fallback to a userspace read/write loop.
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*
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* @param[in] src_path Path to source file.
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* @param[in] dst_path Path to destination file.
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* @param[out] error Pointer to error object. Optional, pass `nullptr` if
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* you are not interested in error details.
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*
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* @return `True` on success, `false` otherwise (with `error` set accordingly).
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*/
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bool tr_sys_path_copy(char const* src_path, char const* dst_path, struct tr_error** error = nullptr);
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/**
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* @brief Portability wrapper for `stat()`.
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*
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* @param[in] path Path to file or directory.
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* @param[in] flags Combination of @ref tr_sys_path_get_info_flags_t values.
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* @param[out] error Pointer to error object. Optional, pass `nullptr` if you
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* are not interested in error details.
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*
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* @return info on success, or nullopt with `error` set accordingly.
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*/
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[[nodiscard]] std::optional<tr_sys_path_info> tr_sys_path_get_info(
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std::string_view path,
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int flags = 0,
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tr_error** error = nullptr);
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/**
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* @brief Portability wrapper for `access()`.
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*
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* @param[in] path Path to file or directory.
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* @param[out] error Pointer to error object. Optional, pass `nullptr` if you
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* are not interested in error details.
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*
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* @return `True` if path exists, `false` otherwise. Note that `false` will also
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* be returned in case of error; if you need to distinguish the two,
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* check if `error` is `nullptr` afterwards.
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*/
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bool tr_sys_path_exists(char const* path, struct tr_error** error = nullptr);
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template<typename T, typename = decltype(&T::c_str)>
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bool tr_sys_path_exists(T const& path, struct tr_error** error = nullptr)
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{
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return tr_sys_path_exists(path.c_str(), error);
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}
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/**
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* @brief Check whether path is relative.
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*
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* This function only analyzes the string, so no error reporting is needed.
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*
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* @param[in] path Path to file or directory.
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*
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* @return `True` if path is relative, `false` otherwise
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*/
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bool tr_sys_path_is_relative(std::string_view path);
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/**
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* @brief Test to see if the two filenames point to the same file.
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*
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* @param[in] path1 Path to first file or directory.
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* @param[in] path2 Path to second file or directory.
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* @param[out] error Pointer to error object. Optional, pass `nullptr` if
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* you are not interested in error details.
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*
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* @return `True` if two paths point to the same file or directory, `false`
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* otherwise. Note that `false` will also be returned in case of error;
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* if you need to distinguish the two, check if `error` is `nullptr`
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* afterwards.
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*/
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bool tr_sys_path_is_same(char const* path1, char const* path2, struct tr_error** error = nullptr);
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template<typename T, typename U, typename = decltype(&T::c_str), typename = decltype(&U::c_str)>
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bool tr_sys_path_is_same(T const& path1, U const& path2, struct tr_error** error = nullptr)
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{
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return tr_sys_path_is_same(path1.c_str(), path2.c_str(), error);
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}
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/**
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* @brief Portability wrapper for `realpath()`.
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*
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* @param[in] path Path to file or directory.
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* @param[out] error Pointer to error object. Optional, pass `nullptr` if you
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* are not interested in error details.
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*
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* @return Full path with symbolic links, `.` and `..` resolved on success,
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* or an empty string otherwise (with `error` set accordingly).
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*/
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std::string tr_sys_path_resolve(std::string_view path, struct tr_error** error = nullptr);
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/**
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* @brief Portability wrapper for `basename()`.
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*
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* @param[in] path Path to file or directory.
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* @param[out] error Pointer to error object. Optional, pass `nullptr` if you
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* are not interested in error details.
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*
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* @return base name (last path component; parent path removed) on success,
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* or empty string otherwise (with `error` set accordingly).
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*/
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std::string_view tr_sys_path_basename(std::string_view path, struct tr_error** error = nullptr);
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/**
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* @brief Portability wrapper for `dirname()`.
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*
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* @param[in] path Path to file or directory.
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*
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* @return parent path substring of `path` (last path component removed) on
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* success, or empty string otherwise with `error` set accordingly).
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*/
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std::string_view tr_sys_path_dirname(std::string_view path);
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/**
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* @brief Portability wrapper for `rename()`.
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*
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* @param[in] src_path Path to source file or directory.
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* @param[in] dst_path Path to destination file or directory.
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* @param[out] error Pointer to error object. Optional, pass `nullptr` if you
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* are not interested in error details.
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*
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* @return `True` on success, `false` otherwise (with `error` set accordingly).
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* Rename will generally only succeed if both source and destination are
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* on the same partition.
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*/
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bool tr_sys_path_rename(char const* src_path, char const* dst_path, struct tr_error** error = nullptr);
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template<typename T, typename U, typename = decltype(&T::c_str), typename = decltype(&U::c_str)>
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bool tr_sys_path_rename(T const& src_path, U const& dst_path, struct tr_error** error = nullptr)
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{
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return tr_sys_path_rename(src_path.c_str(), dst_path.c_str(), error);
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}
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/**
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* @brief Portability wrapper for `remove()`.
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*
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* @param[in] path Path to file or directory.
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* @param[out] error Pointer to error object. Optional, pass `nullptr` if you
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* are not interested in error details.
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*
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* @return `True` on success, `false` otherwise (with `error` set accordingly).
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* Directory removal will only succeed if it is empty (contains no other
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* files and directories).
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*/
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bool tr_sys_path_remove(char const* path, struct tr_error** error = nullptr);
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template<typename T, typename = decltype(&T::c_str)>
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bool tr_sys_path_remove(T const& path, struct tr_error** error = nullptr)
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{
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return tr_sys_path_remove(path.c_str(), error);
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}
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/**
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* @brief Transform path separators to native ones, in-place.
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*
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* @param[in,out] path Path to transform.
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*
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* @return Same path but with native (and uniform) separators.
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*/
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char* tr_sys_path_native_separators(char* path);
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/* File-related wrappers */
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/**
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* @brief Get handle to one of standard I/O files.
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*
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* @param[in] std_file Standard file identifier.
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* @param[out] error Pointer to error object. Optional, pass `nullptr` if you
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* are not interested in error details.
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*
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* @return Opened file descriptor on success, `TR_BAD_SYS_FILE` otherwise (with
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* `error` set accordingly). DO NOT pass this descriptor to
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* @ref tr_sys_file_close (unless you know what you are doing).
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*/
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tr_sys_file_t tr_sys_file_get_std(tr_std_sys_file_t std_file, struct tr_error** error = nullptr);
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/**
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* @brief Portability wrapper for `open()`.
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*
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* @param[in] path Path to file.
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* @param[in] flags Combination of @ref tr_sys_file_open_flags_t values.
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* @param[in] permissions Permissions to create file with (in case
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@ref TR_SYS_FILE_CREATE is used). Not used on Windows.
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* @param[out] error Pointer to error object. Optional, pass `nullptr` if
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* you are not interested in error details.
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*
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* @return Opened file descriptor on success, `TR_BAD_SYS_FILE` otherwise (with
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* `error` set accordingly).
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*/
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tr_sys_file_t tr_sys_file_open(char const* path, int flags, int permissions, struct tr_error** error = nullptr);
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/**
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* @brief Portability wrapper for `mkstemp()`.
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*
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* @param[in,out] path_template Template path to file. Should end with at least
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* six 'X' characters. Upon success, trailing 'X'
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* characters are replaced with actual random
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* characters used to form a unique path to
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* temporary file.
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* @param[out] error Pointer to error object. Optional, pass `nullptr`
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* if you are not interested in error details.
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*
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* @return Opened file descriptor on success, `TR_BAD_SYS_FILE` otherwise (with
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* `error` set accordingly).
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*/
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tr_sys_file_t tr_sys_file_open_temp(char* path_template, struct tr_error** error = nullptr);
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/**
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* @brief Portability wrapper for `close()`.
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*
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* @param[in] handle Valid file descriptor.
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* @param[out] error Pointer to error object. Optional, pass `nullptr` if you
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* are not interested in error details.
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*
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* @return `True` on success, `false` otherwise (with `error` set accordingly).
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*/
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bool tr_sys_file_close(tr_sys_file_t handle, struct tr_error** error = nullptr);
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/**
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* @brief Portability wrapper for `read()`.
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*
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* @param[in] handle Valid file descriptor.
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* @param[out] buffer Buffer to store read data to.
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* @param[in] size Number of bytes to read.
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* @param[out] bytes_read Number of bytes actually read. Optional, pass `nullptr`
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* if you are not interested.
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* @param[out] error Pointer to error object. Optional, pass `nullptr` if
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* you are not interested in error details.
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*
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* @return `True` on success, `false` otherwise (with `error` set accordingly).
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*/
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bool tr_sys_file_read(
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tr_sys_file_t handle,
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void* buffer,
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uint64_t size,
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uint64_t* bytes_read,
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struct tr_error** error = nullptr);
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/**
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* @brief Like `pread()`, except that the position is undefined afterwards.
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* Not thread-safe.
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*
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* @param[in] handle Valid file descriptor.
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* @param[out] buffer Buffer to store read data to.
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* @param[in] size Number of bytes to read.
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* @param[in] offset File offset in bytes to start reading from.
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* @param[out] bytes_read Number of bytes actually read. Optional, pass `nullptr`
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* if you are not interested.
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* @param[out] error Pointer to error object. Optional, pass `nullptr` if
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* you are not interested in error details.
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*
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* @return `True` on success, `false` otherwise (with `error` set accordingly).
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*/
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bool tr_sys_file_read_at(
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tr_sys_file_t handle,
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void* buffer,
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uint64_t size,
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uint64_t offset,
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uint64_t* bytes_read,
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struct tr_error** error = nullptr);
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/**
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* @brief Portability wrapper for `write()`.
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*
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* @param[in] handle Valid file descriptor.
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* @param[in] buffer Buffer to get data being written from.
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* @param[in] size Number of bytes to write.
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* @param[out] bytes_written Number of bytes actually written. Optional, pass
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* `nullptr` if you are not interested.
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* @param[out] error Pointer to error object. Optional, pass `nullptr` if
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* you are not interested in error details.
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*
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* @return `True` on success, `false` otherwise (with `error` set accordingly).
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*/
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bool tr_sys_file_write(
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tr_sys_file_t handle,
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void const* buffer,
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uint64_t size,
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uint64_t* bytes_written,
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struct tr_error** error = nullptr);
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/**
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* @brief Like `pwrite()`, except that the position is undefined afterwards.
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* Not thread-safe.
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*
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* @param[in] handle Valid file descriptor.
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* @param[in] buffer Buffer to get data being written from.
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* @param[in] size Number of bytes to write.
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* @param[in] offset File offset in bytes to start writing from.
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* @param[out] bytes_written Number of bytes actually written. Optional, pass
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* `nullptr` if you are not interested.
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* @param[out] error Pointer to error object. Optional, pass `nullptr`
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* if you are not interested in error details.
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*
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* @return `True` on success, `false` otherwise (with `error` set accordingly).
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*/
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bool tr_sys_file_write_at(
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tr_sys_file_t handle,
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void const* buffer,
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uint64_t size,
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uint64_t offset,
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uint64_t* bytes_written,
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struct tr_error** error = nullptr);
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/**
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* @brief Portability wrapper for `fsync()`.
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*
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* @param[in] handle Valid file descriptor.
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* @param[out] error Pointer to error object. Optional, pass `nullptr` if you
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* are not interested in error details.
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*
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* @return `True` on success, `false` otherwise (with `error` set accordingly).
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*/
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bool tr_sys_file_flush(tr_sys_file_t handle, struct tr_error** error = nullptr);
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/**
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* @brief Portability wrapper for `ftruncate()`.
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*
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* @param[in] handle Valid file descriptor.
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* @param[in] size Number of bytes to truncate (or extend) file to.
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* @param[out] error Pointer to error object. Optional, pass `nullptr` if you
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* are not interested in error details.
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*
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* @return `True` on success, `false` otherwise (with `error` set accordingly).
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*/
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bool tr_sys_file_truncate(tr_sys_file_t handle, uint64_t size, struct tr_error** error = nullptr);
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/**
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* @brief Tell system to prefetch or discard some part of file which is [not] to be read soon.
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*
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* @param[in] handle Valid file descriptor.
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* @param[in] offset Offset in file to prefetch from.
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* @param[in] size Number of bytes to prefetch.
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* @param[out] error Pointer to error object. Optional, pass `nullptr` if you
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* are not interested in error details.
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*
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* @return `True` on success, `false` otherwise (with `error` set accordingly).
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*/
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bool tr_sys_file_advise(
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tr_sys_file_t handle,
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uint64_t offset,
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uint64_t size,
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tr_sys_file_advice_t advice,
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struct tr_error** error = nullptr);
|
|
|
|
/**
|
|
* @brief Preallocate file to specified size in full or sparse mode.
|
|
*
|
|
* @param[in] handle Valid file descriptor.
|
|
* @param[in] size Number of bytes to preallocate file to.
|
|
* @param[in] flags Combination of @ref tr_sys_file_preallocate_flags_t values.
|
|
* @param[out] error Pointer to error object. Optional, pass `nullptr` if you
|
|
* are not interested in error details.
|
|
*
|
|
* @return `True` on success, `false` otherwise (with `error` set accordingly).
|
|
*/
|
|
bool tr_sys_file_preallocate(tr_sys_file_t handle, uint64_t size, int flags, struct tr_error** error = nullptr);
|
|
|
|
/**
|
|
* @brief Portability wrapper for `flock()`.
|
|
*
|
|
* Don't try to upgrade or downgrade the lock unless you know what you are
|
|
* doing, as behavior varies a bit between platforms.
|
|
*
|
|
* @param[in] handle Valid file descriptor.
|
|
* @param[in] operation Combination of @ref tr_sys_file_lock_flags_t values.
|
|
* @param[out] error Pointer to error object. Optional, pass `nullptr` if you
|
|
* are not interested in error details.
|
|
*
|
|
* @return `True` on success, `false` otherwise (with `error` set accordingly).
|
|
*/
|
|
bool tr_sys_file_lock(tr_sys_file_t handle, int operation, struct tr_error** error = nullptr);
|
|
|
|
/* File-related wrappers (utility) */
|
|
|
|
/**
|
|
* @brief Portability wrapper for `fputs()`, appending EOL internally.
|
|
*
|
|
* Special care should be taken when writing to one of standard output streams
|
|
* (@ref tr_std_sys_file_t) since no UTF-8 conversion is currently being made.
|
|
*
|
|
* Writing to other streams (files, pipes) also leaves data untouched, so it
|
|
* should already be in UTF-8 encoding, or whichever else you expect.
|
|
*
|
|
* @param[in] handle Valid file descriptor.
|
|
* @param[in] buffer String to write.
|
|
* @param[out] error Pointer to error object. Optional, pass `nullptr` if you
|
|
* are not interested in error details.
|
|
*
|
|
* @return `True` on success, `false` otherwise (with `error` set accordingly).
|
|
*/
|
|
bool tr_sys_file_write_line(tr_sys_file_t handle, std::string_view buffer, struct tr_error** error = nullptr);
|
|
|
|
/* Directory-related wrappers */
|
|
|
|
/**
|
|
* @brief Portability wrapper for `getcwd()`.
|
|
*
|
|
* @param[out] error Pointer to error object. Optional, pass `nullptr` if you are
|
|
* not interested in error details.
|
|
*
|
|
* @return current directory on success, or an empty string otherwise
|
|
* (with `error` set accordingly).
|
|
*/
|
|
std::string tr_sys_dir_get_current(struct tr_error** error = nullptr);
|
|
|
|
/**
|
|
* @brief Like `mkdir()`, but makes parent directories if needed.
|
|
*
|
|
* @param[in] path Path to directory.
|
|
* @param[in] flags Combination of @ref tr_sys_dir_create_flags_t values.
|
|
* @param[in] permissions Permissions to create directory with. Not used on
|
|
Windows.
|
|
* @param[out] error Pointer to error object. Optional, pass `nullptr` if
|
|
* you are not interested in error details.
|
|
*
|
|
* @return `True` on success, `false` otherwise (with `error` set accordingly).
|
|
*/
|
|
bool tr_sys_dir_create(char const* path, int flags, int permissions, struct tr_error** error = nullptr);
|
|
|
|
template<typename T, typename = decltype(&T::c_str)>
|
|
bool tr_sys_dir_create(T const& path, int flags, int permissions, struct tr_error** error = nullptr)
|
|
{
|
|
return tr_sys_dir_create(path.c_str(), flags, permissions, error);
|
|
}
|
|
|
|
/**
|
|
* @brief Portability wrapper for `mkdtemp()`.
|
|
*
|
|
* @param[in,out] path_template Template path to directory. Should end with at
|
|
* least six 'X' characters. Upon success, trailing
|
|
* 'X' characters are replaced with actual random
|
|
* characters used to form a unique path to
|
|
* temporary directory.
|
|
* @param[out] error Pointer to error object. Optional, pass `nullptr`
|
|
* if you are not interested in error details.
|
|
*
|
|
* @return `True` on success, `false` otherwise (with `error` set accordingly).
|
|
*/
|
|
bool tr_sys_dir_create_temp(char* path_template, struct tr_error** error = nullptr);
|
|
|
|
/**
|
|
* @brief Portability wrapper for `opendir()`.
|
|
*
|
|
* @param[in] path Path to directory.
|
|
* @param[out] error Pointer to error object. Optional, pass `nullptr` if you are
|
|
* not interested in error details.
|
|
*
|
|
* @return Opened directory descriptor on success, `TR_BAD_SYS_DIR` otherwise
|
|
* (with `error` set accordingly).
|
|
*/
|
|
tr_sys_dir_t tr_sys_dir_open(char const* path, struct tr_error** error = nullptr);
|
|
|
|
/**
|
|
* @brief Portability wrapper for `readdir()`.
|
|
*
|
|
* @param[in] handle Valid directory descriptor.
|
|
* @param[out] error Pointer to error object. Optional, pass `nullptr` if you
|
|
* are not interested in error details.
|
|
*
|
|
* @return Pointer to next directory entry name (stored internally, DO NOT free
|
|
* it) on success, `nullptr` otherwise (with `error` set accordingly).
|
|
* Note that `nullptr` will also be returned in case of end of directory.
|
|
* If you need to distinguish the two, check if `error` is `nullptr`
|
|
* afterwards.
|
|
*/
|
|
char const* tr_sys_dir_read_name(tr_sys_dir_t handle, struct tr_error** error = nullptr);
|
|
|
|
/**
|
|
* @brief Portability wrapper for `closedir()`.
|
|
*
|
|
* @param[in] handle Valid directory descriptor.
|
|
* @param[out] error Pointer to error object. Optional, pass `nullptr` if you
|
|
* are not interested in error details.
|
|
*
|
|
* @return `True` on success, `false` otherwise (with `error` set accordingly).
|
|
*/
|
|
bool tr_sys_dir_close(tr_sys_dir_t handle, struct tr_error** error = nullptr);
|
|
|
|
/** @} */
|
|
/** @} */
|