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350 lines
9.0 KiB
C++
350 lines
9.0 KiB
C++
/**************************************************************************/
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/* file_access_unix.cpp */
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/**************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/**************************************************************************/
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/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
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/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/**************************************************************************/
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#include "file_access_unix.h"
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#if defined(UNIX_ENABLED)
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#include "core/os/os.h"
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#include "core/string/print_string.h"
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#include <errno.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#if defined(UNIX_ENABLED)
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#include <unistd.h>
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#endif
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#ifdef MSVC
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#define S_ISREG(m) ((m)&_S_IFREG)
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#include <io.h>
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#endif
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#ifndef S_ISREG
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#define S_ISREG(m) ((m)&S_IFREG)
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#endif
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void FileAccessUnix::check_errors() const {
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ERR_FAIL_COND_MSG(!f, "File must be opened before use.");
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if (feof(f)) {
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last_error = ERR_FILE_EOF;
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}
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}
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Error FileAccessUnix::open_internal(const String &p_path, int p_mode_flags) {
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_close();
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path_src = p_path;
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path = fix_path(p_path);
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//printf("opening %s, %i\n", path.utf8().get_data(), Memory::get_static_mem_usage());
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ERR_FAIL_COND_V_MSG(f, ERR_ALREADY_IN_USE, "File is already in use.");
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const char *mode_string;
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if (p_mode_flags == READ) {
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mode_string = "rb";
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} else if (p_mode_flags == WRITE) {
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mode_string = "wb";
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} else if (p_mode_flags == READ_WRITE) {
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mode_string = "rb+";
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} else if (p_mode_flags == WRITE_READ) {
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mode_string = "wb+";
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} else {
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return ERR_INVALID_PARAMETER;
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}
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/* pretty much every implementation that uses fopen as primary
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backend (unix-compatible mostly) supports utf8 encoding */
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//printf("opening %s as %s\n", p_path.utf8().get_data(), path.utf8().get_data());
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struct stat st = {};
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int err = stat(path.utf8().get_data(), &st);
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if (!err) {
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switch (st.st_mode & S_IFMT) {
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case S_IFLNK:
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case S_IFREG:
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break;
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default:
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return ERR_FILE_CANT_OPEN;
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}
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}
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if (is_backup_save_enabled() && (p_mode_flags == WRITE)) {
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save_path = path;
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// Create a temporary file in the same directory as the target file.
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path = path + "-XXXXXX";
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CharString cs = path.utf8();
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int fd = mkstemp(cs.ptrw());
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if (fd == -1) {
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last_error = ERR_FILE_CANT_OPEN;
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return last_error;
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}
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fchmod(fd, 0666);
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path = String::utf8(cs.ptr());
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f = fdopen(fd, mode_string);
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if (f == nullptr) {
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// Delete temp file and close descriptor if open failed.
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::unlink(cs.ptr());
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::close(fd);
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last_error = ERR_FILE_CANT_OPEN;
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return last_error;
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}
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} else {
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f = fopen(path.utf8().get_data(), mode_string);
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}
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if (f == nullptr) {
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switch (errno) {
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case ENOENT: {
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last_error = ERR_FILE_NOT_FOUND;
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} break;
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default: {
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last_error = ERR_FILE_CANT_OPEN;
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} break;
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}
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return last_error;
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}
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// Set close on exec to avoid leaking it to subprocesses.
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int fd = fileno(f);
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if (fd != -1) {
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int opts = fcntl(fd, F_GETFD);
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fcntl(fd, F_SETFD, opts | FD_CLOEXEC);
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}
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last_error = OK;
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flags = p_mode_flags;
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return OK;
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}
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void FileAccessUnix::_close() {
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if (!f) {
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return;
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}
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fclose(f);
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f = nullptr;
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if (close_notification_func) {
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close_notification_func(path, flags);
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}
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if (!save_path.is_empty()) {
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int rename_error = rename(path.utf8().get_data(), save_path.utf8().get_data());
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if (rename_error && close_fail_notify) {
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close_fail_notify(save_path);
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}
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save_path = "";
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ERR_FAIL_COND(rename_error != 0);
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}
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}
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bool FileAccessUnix::is_open() const {
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return (f != nullptr);
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}
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String FileAccessUnix::get_path() const {
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return path_src;
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}
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String FileAccessUnix::get_path_absolute() const {
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return path;
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}
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void FileAccessUnix::seek(uint64_t p_position) {
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ERR_FAIL_COND_MSG(!f, "File must be opened before use.");
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last_error = OK;
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if (fseeko(f, p_position, SEEK_SET)) {
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check_errors();
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}
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}
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void FileAccessUnix::seek_end(int64_t p_position) {
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ERR_FAIL_COND_MSG(!f, "File must be opened before use.");
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if (fseeko(f, p_position, SEEK_END)) {
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check_errors();
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}
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}
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uint64_t FileAccessUnix::get_position() const {
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ERR_FAIL_COND_V_MSG(!f, 0, "File must be opened before use.");
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int64_t pos = ftello(f);
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if (pos < 0) {
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check_errors();
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ERR_FAIL_V(0);
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}
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return pos;
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}
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uint64_t FileAccessUnix::get_length() const {
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ERR_FAIL_COND_V_MSG(!f, 0, "File must be opened before use.");
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int64_t pos = ftello(f);
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ERR_FAIL_COND_V(pos < 0, 0);
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ERR_FAIL_COND_V(fseeko(f, 0, SEEK_END), 0);
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int64_t size = ftello(f);
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ERR_FAIL_COND_V(size < 0, 0);
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ERR_FAIL_COND_V(fseeko(f, pos, SEEK_SET), 0);
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return size;
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}
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bool FileAccessUnix::eof_reached() const {
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return last_error == ERR_FILE_EOF;
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}
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uint8_t FileAccessUnix::get_8() const {
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ERR_FAIL_COND_V_MSG(!f, 0, "File must be opened before use.");
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uint8_t b;
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if (fread(&b, 1, 1, f) == 0) {
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check_errors();
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b = '\0';
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}
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return b;
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}
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uint64_t FileAccessUnix::get_buffer(uint8_t *p_dst, uint64_t p_length) const {
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ERR_FAIL_COND_V(!p_dst && p_length > 0, -1);
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ERR_FAIL_COND_V_MSG(!f, -1, "File must be opened before use.");
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uint64_t read = fread(p_dst, 1, p_length, f);
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check_errors();
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return read;
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}
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Error FileAccessUnix::get_error() const {
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return last_error;
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}
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void FileAccessUnix::flush() {
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ERR_FAIL_COND_MSG(!f, "File must be opened before use.");
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fflush(f);
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}
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void FileAccessUnix::store_8(uint8_t p_dest) {
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ERR_FAIL_COND_MSG(!f, "File must be opened before use.");
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ERR_FAIL_COND(fwrite(&p_dest, 1, 1, f) != 1);
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}
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void FileAccessUnix::store_buffer(const uint8_t *p_src, uint64_t p_length) {
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ERR_FAIL_COND_MSG(!f, "File must be opened before use.");
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ERR_FAIL_COND(!p_src && p_length > 0);
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ERR_FAIL_COND(fwrite(p_src, 1, p_length, f) != p_length);
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}
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bool FileAccessUnix::file_exists(const String &p_path) {
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int err;
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struct stat st = {};
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String filename = fix_path(p_path);
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// Does the name exist at all?
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err = stat(filename.utf8().get_data(), &st);
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if (err) {
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return false;
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}
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#ifdef UNIX_ENABLED
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// See if we have access to the file
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if (access(filename.utf8().get_data(), F_OK)) {
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return false;
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}
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#else
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if (_access(filename.utf8().get_data(), 4) == -1) {
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return false;
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}
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#endif
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// See if this is a regular file
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switch (st.st_mode & S_IFMT) {
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case S_IFLNK:
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case S_IFREG:
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return true;
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default:
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return false;
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}
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}
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uint64_t FileAccessUnix::_get_modified_time(const String &p_file) {
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String file = fix_path(p_file);
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struct stat status = {};
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int err = stat(file.utf8().get_data(), &status);
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if (!err) {
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return status.st_mtime;
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} else {
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print_verbose("Failed to get modified time for: " + p_file + "");
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return 0;
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}
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}
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uint32_t FileAccessUnix::_get_unix_permissions(const String &p_file) {
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String file = fix_path(p_file);
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struct stat status = {};
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int err = stat(file.utf8().get_data(), &status);
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if (!err) {
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return status.st_mode & 0x7FF; //only permissions
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} else {
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ERR_FAIL_V_MSG(0, "Failed to get unix permissions for: " + p_file + ".");
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}
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}
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Error FileAccessUnix::_set_unix_permissions(const String &p_file, uint32_t p_permissions) {
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String file = fix_path(p_file);
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int err = chmod(file.utf8().get_data(), p_permissions);
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if (!err) {
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return OK;
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}
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return FAILED;
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}
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void FileAccessUnix::close() {
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_close();
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}
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CloseNotificationFunc FileAccessUnix::close_notification_func = nullptr;
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FileAccessUnix::~FileAccessUnix() {
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_close();
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}
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#endif // UNIX_ENABLED
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