mirror of
https://github.com/Detanup01/gbe_fork.git
synced 2024-12-12 19:57:02 +08:00
568 lines
18 KiB
C++
568 lines
18 KiB
C++
/* Copyright (C) 2019 Mr Goldberg
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This file is part of the Goldberg Emulator
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The Goldberg Emulator is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 3 of the License, or (at your option) any later version.
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The Goldberg Emulator is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the Goldberg Emulator; if not, see
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<http://www.gnu.org/licenses/>. */
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#if defined(WIN64) || defined(_WIN64) || defined(__MINGW64__)
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#define __WINDOWS_64__
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#elif defined(WIN32) || defined(_WIN32) || defined(__MINGW32__)
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#define __WINDOWS_32__
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#endif
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#if defined(__WINDOWS_32__) || defined(__WINDOWS_64__)
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// Nothing to be done here
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#else
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#define STEAM_API_FUNCTIONS_IMPL
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#include "dll/base.h"
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#include "dll/dll.h"
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#define PATH_SEPARATOR_CHAR '/'
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#define STEAM_PATH_CACHE_SIZE 4096
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const char *STEAM_PATH;
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size_t STEAM_PATH_SIZE;
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// Returns a '/' terminated absolute path to the steam folder in user's home,
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// root is returned if env home is not set
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const char *get_steam_path()
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{
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char *home_path = getenv("HOME");
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char steam_path[STEAM_PATH_CACHE_SIZE];
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char *steam_realpath = nullptr;
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// Build steam_path from home
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int required_size = snprintf(steam_path, STEAM_PATH_CACHE_SIZE, "%s/.steam/steam", home_path);
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// Allocate more space for steam_path if needed (required_size does not count terminator)
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if (required_size > 0 && required_size >= STEAM_PATH_CACHE_SIZE) {
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char *large_steam_path = (char *)malloc(sizeof(char) * (required_size + 1));
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int check_size = snprintf(large_steam_path, required_size + 1, "%s/.steam/steam", home_path);
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// Check that path fits this time
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if (check_size == required_size) {
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steam_realpath = realpath(large_steam_path, nullptr);
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}
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free(large_steam_path);
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} else {
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steam_realpath = realpath(steam_path, nullptr);
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}
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// Terminate path with a file separator
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if (steam_realpath && *steam_realpath) {
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size_t path_size = strlen(steam_realpath);
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if (steam_realpath[path_size - 1] != PATH_SEPARATOR_CHAR) {
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steam_realpath = (char *)realloc(steam_realpath, path_size + 2);
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steam_realpath[path_size] = PATH_SEPARATOR_CHAR;
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steam_realpath[path_size + 1] = 0;
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}
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} else {
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// Failsafe to root
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steam_realpath = strdup("/");
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}
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return steam_realpath;
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}
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// Fixes given path by navigating filesystem and lowering case to match
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// existing entries on disk
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bool match_path(char *path, int start, bool accept_same_case)
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{
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if (!path[start + 1]) {
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return true;
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}
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// Snap to the next separator in path
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int separator = start + 1;
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while (path[separator] != PATH_SEPARATOR_CHAR && path[separator]) {
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separator++;
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}
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bool is_last_component = path[separator] != PATH_SEPARATOR_CHAR;
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char stored_char = path[separator];
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path[separator] = 0;
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bool path_accessible = access(path, F_OK) == 0;
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path[separator] = stored_char;
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if (!path_accessible || (!is_last_component && !match_path(path, separator, accept_same_case))) {
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DIR *current_directory = nullptr;
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int component = start + 1;
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if (start) {
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stored_char = path[start];
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path[start] = 0;
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current_directory = opendir(path);
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path[start] = stored_char;
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component = start + 1;
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} else {
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if (*path == PATH_SEPARATOR_CHAR) {
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component = start + 1;
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current_directory = opendir("/");
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} else {
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component = start;
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current_directory = opendir(".");
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}
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}
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// 0123456789012345678901234567890123456789
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// path = /this/is/a/sample/path/to/file.txt
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// ^^ ^
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// ab c
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// a. start = 10
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// b. component = 11
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// c. separator = 17
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// current_directory = /this/is/a/
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if (current_directory) {
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dirent64 *entry = (dirent64 *)readdir64(current_directory);
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while (entry) {
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const char *entry_name = entry->d_name;
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stored_char = path[separator];
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path[separator] = 0;
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// Fix current component if entry with similar name exists
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if (!strcasecmp(&path[component], entry_name)) {
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bool case_differs = strcmp(&path[component], entry_name) != 0;
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path[separator] = stored_char;
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if (case_differs) {
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char *iterator = &path[component];
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// Replace with entry name
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while (*entry_name != PATH_SEPARATOR_CHAR && *entry_name) {
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*(iterator++) = *(entry_name++);
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}
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// Fix next component
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if (is_last_component || match_path(path, separator, accept_same_case)) {
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closedir(current_directory);
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return true;
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}
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}
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} else {
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path[separator] = stored_char;
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}
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entry = (dirent64 *)readdir64(current_directory);
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}
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}
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if (current_directory) {
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closedir(current_directory);
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}
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return accept_same_case && is_last_component;
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}
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return true;
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}
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// Tries to convert the given path to the preferred lower-cased version
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const char *lowercase_path(const char *path, bool accept_same_case, bool stop_at_separator)
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{
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std::locale loc;
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char *path_lowercased = nullptr;
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if (path && *path) {
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// If file does not exist
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if (access(path, F_OK)) {
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// Make a copy of the path on which to work on
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path_lowercased = strdup(path);
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if (!path_lowercased) {
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return nullptr;
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}
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// Load steam path if not done already
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if (!STEAM_PATH) {
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STEAM_PATH = get_steam_path();
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STEAM_PATH_SIZE = strlen(STEAM_PATH);
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}
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char *lowercase_iterator = path_lowercased;
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// Lowercase whole steam path if possible
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bool has_steam_root = false;
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if (!strncasecmp(path_lowercased, STEAM_PATH, STEAM_PATH_SIZE)) {
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memcpy(path_lowercased, STEAM_PATH, STEAM_PATH_SIZE);
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lowercase_iterator = &path_lowercased[STEAM_PATH_SIZE - 1];
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has_steam_root = true;
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}
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// Lowercase rest of the path
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char *iterator = lowercase_iterator;
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while ((!stop_at_separator || *iterator != PATH_SEPARATOR_CHAR) && *iterator) {
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*iterator = std::tolower(*iterator, loc);
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iterator++;
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}
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// Check if we can access the lowered-case path
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int error = access(path_lowercased, F_OK);
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if (!error) {
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// The new path is valid
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return path_lowercased;
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} else {
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if (accept_same_case) {
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const char *name_iterator = &path[lowercase_iterator - path_lowercased];
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while (*lowercase_iterator) {
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*(lowercase_iterator++) = *(name_iterator++);
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}
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}
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// Retry accesing the file again and tweak the path if needed
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if (match_path(path_lowercased, has_steam_root? STEAM_PATH_SIZE - 1 : 0, accept_same_case)) {
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return path_lowercased;
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}
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}
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}
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}
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return path;
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}
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STEAMAPI_API FILE *__wrap_freopen(const char *path, const char *modes, FILE *stream)
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{
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bool is_writable = strpbrk(modes, "wa+") != 0;
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const char *path_lowercased = lowercase_path(path, is_writable, true);
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FILE *result = freopen(path_lowercased, modes, stream);
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if (path_lowercased != path) {
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free((void *)path_lowercased);
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}
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return result;
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}
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STEAMAPI_API FILE *__wrap_fopen(const char *path, const char *modes)
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{
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bool is_writable = strpbrk(modes, "wa+") != 0;
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const char *path_lowercased = lowercase_path(path, is_writable, true);
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FILE *result = fopen(path_lowercased, modes);
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if (path_lowercased != path) {
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free((void *)path_lowercased);
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}
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return result;
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}
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STEAMAPI_API FILE *__wrap_fopen64(const char *path, const char *modes)
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{
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bool is_writable = strpbrk(modes, "wa+") != 0;
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const char *path_lowercased = lowercase_path(path, is_writable, true);
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FILE *result = fopen64(path_lowercased, modes);
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if (path_lowercased != path) {
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free((void *)path_lowercased);
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}
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return result;
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}
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STEAMAPI_API int __wrap_open(const char *path, int flags, mode_t mode)
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{
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bool is_writable = flags & (X_OK | W_OK);
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const char *path_lowercased = lowercase_path(path, is_writable, true);
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int result = open(path_lowercased, flags, mode);
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if (path_lowercased != path) {
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free((void *)path_lowercased);
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}
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return result;
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}
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STEAMAPI_API int __wrap_open64(const char *path, int flags, mode_t mode)
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{
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bool is_writable = flags & (X_OK | W_OK);
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const char *path_lowercased = lowercase_path(path, is_writable, true);
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int result = open64(path_lowercased, flags, mode);
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if (path_lowercased != path) {
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free((void *)path_lowercased);
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}
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return result;
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}
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STEAMAPI_API int __wrap_access(const char *path, int mode)
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{
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const char *path_lowercased = lowercase_path(path, false, false);
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int result = access(path_lowercased, mode);
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if (path_lowercased != path) {
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free((void *)path_lowercased);
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}
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return result;
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}
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STEAMAPI_API int __wrap___xstat(int ver, const char * path, struct stat * stat_buf)
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{
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const char *path_lowercased = lowercase_path(path, false, false);
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int result = stat(path_lowercased, stat_buf);
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if (path_lowercased != path) {
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free((void *)path_lowercased);
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}
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return result;
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}
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STEAMAPI_API int __wrap_stat(const char * path, struct stat * stat_buf)
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{
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return __wrap___xstat(3, path, stat_buf);
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}
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STEAMAPI_API int __wrap___lxstat(int ver, const char * path, struct stat * stat_buf)
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{
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const char *path_lowercased = lowercase_path(path, false, false);
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int result = lstat(path_lowercased, stat_buf);
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if (path_lowercased != path) {
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free((void *)path_lowercased);
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}
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return result;
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}
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STEAMAPI_API int __wrap_lstat(const char * path, struct stat * stat_buf)
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{
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return __wrap___lxstat(3, path, stat_buf);
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}
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STEAMAPI_API int __wrap_scandir(const char *path, struct dirent ***namelist, int (*sel)(const struct dirent *), int (*compar)(const struct dirent **, const struct dirent **))
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{
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const char *path_lowercased = lowercase_path(path, false, false);
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int result = scandir(path_lowercased, namelist, sel, compar);
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if (path_lowercased != path) {
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free((void *)path_lowercased);
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}
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return result;
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}
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STEAMAPI_API int __wrap_scandir64(const char *path, struct dirent64 ***namelist, int (*sel)(const struct dirent64 *), int (*compar)(const struct dirent64 **, const struct dirent64 **))
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{
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const char *path_lowercased = lowercase_path(path, false, false);
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int result = scandir64(path_lowercased, namelist, sel, compar);
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if (path_lowercased != path) {
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free((void *)path_lowercased);
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}
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return result;
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}
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STEAMAPI_API DIR *__wrap_opendir(const char *path)
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{
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const char *path_lowercased = lowercase_path(path, false, false);
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DIR *result = opendir(path_lowercased);
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if (path_lowercased != path) {
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free((void *)path_lowercased);
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}
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return result;
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}
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STEAMAPI_API int __wrap___xstat64(int ver, const char *path, struct stat64 *stat_buf)
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{
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const char *path_lowercased = lowercase_path(path, false, false);
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int result = stat64(path_lowercased, stat_buf);
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if (path_lowercased != path) {
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free((void *)path_lowercased);
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}
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return result;
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}
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STEAMAPI_API int __wrap___lxstat64(int ver, const char *path, struct stat64 *stat_buf)
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{
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const char *path_lowercased = lowercase_path(path, false, false);
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int result = lstat64(path_lowercased, stat_buf);
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if (path_lowercased != path) {
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free((void *)path_lowercased);
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}
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return result;
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}
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STEAMAPI_API int __wrap_statvfs(const char *path, struct statvfs *buf)
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{
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const char *path_lowercased = lowercase_path(path, false, false);
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int result = statvfs(path_lowercased, buf);
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if (path_lowercased != path) {
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free((void *)path_lowercased);
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}
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return result;
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}
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STEAMAPI_API int __wrap_statvfs64(const char *path, struct statvfs64 *buf)
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{
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const char *path_lowercased = lowercase_path(path, false, false);
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int result = statvfs64(path_lowercased, buf);
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if (path_lowercased != path) {
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free((void *)path_lowercased);
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}
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return result;
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}
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STEAMAPI_API int __wrap_chmod(const char *path, mode_t mode)
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{
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const char *path_lowercased = lowercase_path(path, false, false);
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int result = chmod(path_lowercased, mode);
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if (path_lowercased != path) {
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free((void *)path_lowercased);
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}
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return result;
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}
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STEAMAPI_API int __wrap_chown(const char *path, uid_t owner, gid_t group)
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{
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const char *path_lowercased = lowercase_path(path, false, false);
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int result = chown(path_lowercased, owner, group);
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if (path_lowercased != path) {
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free((void *)path_lowercased);
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}
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return result;
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}
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STEAMAPI_API int __wrap_lchown(const char *path, uid_t owner, gid_t group)
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{
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const char *path_lowercased = lowercase_path(path, false, false);
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int result = lchown(path_lowercased, owner, group);
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if (path_lowercased != path) {
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free((void *)path_lowercased);
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}
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return result;
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}
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STEAMAPI_API int __wrap_symlink(const char *path1, const char *path2)
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{
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const char *path_lowercased1 = lowercase_path(path1, true, true);
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const char *path_lowercased2 = lowercase_path(path2, false, false);
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int result = symlink(path_lowercased1, path_lowercased2);
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if (path_lowercased1 != path1) {
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free((void *)path_lowercased1);
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}
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if (path_lowercased2 != path2) {
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free((void *)path_lowercased2);
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}
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return result;
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}
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STEAMAPI_API int __wrap_link(const char *path1, const char *path2)
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{
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const char *path_lowercased1 = lowercase_path(path1, true, true);
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const char *path_lowercased2 = lowercase_path(path2, false, false);
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int result = link(path_lowercased1, path_lowercased2);
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if (path_lowercased1 != path1) {
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free((void *)path_lowercased1);
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}
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if (path_lowercased2 != path2) {
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free((void *)path_lowercased2);
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}
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return result;
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}
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STEAMAPI_API int __wrap_mknod(const char *path, mode_t mode, dev_t dev)
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{
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const char *path_lowercased = lowercase_path(path, true, true);
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int result = mknod(path_lowercased, mode, dev);
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if (path_lowercased != path) {
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free((void *)path_lowercased);
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}
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return result;
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}
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STEAMAPI_API int __wrap_mount(const char *source, const char *target, const char *filesystemtype, unsigned long mountflags, const void *data)
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{
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const char *source_lowercased = lowercase_path(source, false, false);
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const char *target_lowercased = lowercase_path(target, false, false);
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int result = mount(source_lowercased, target_lowercased, filesystemtype, mountflags, data);
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if (source_lowercased != source) {
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free((void *)source_lowercased);
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}
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if (target_lowercased != target) {
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free((void *)target_lowercased);
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}
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return result;
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}
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STEAMAPI_API int __wrap_unlink(const char *path)
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{
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const char *path_lowercased = lowercase_path(path, false, false);
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int result = unlink(path);
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if (path_lowercased != path) {
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free((void *)path_lowercased);
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}
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return result;
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}
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STEAMAPI_API int __wrap_mkfifo(const char *path, mode_t mode)
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{
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const char *path_lowercased = lowercase_path(path, true, true);
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int result = mkfifo(path, mode);
|
|
if (path_lowercased != path) {
|
|
free((void *)path_lowercased);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
STEAMAPI_API int __wrap_rename(const char *old_name, const char *new_name)
|
|
{
|
|
const char *old_name_lowercased = lowercase_path(old_name, true, true);
|
|
const char *new_name_lowercased = lowercase_path(new_name, false, false);
|
|
int result = rename(old_name_lowercased, new_name_lowercased);
|
|
if (old_name_lowercased != old_name) {
|
|
free((void *)old_name_lowercased);
|
|
}
|
|
if (new_name_lowercased != new_name) {
|
|
free((void *)new_name_lowercased);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
STEAMAPI_API int __wrap_utime(const char *path, const struct utimbuf *times)
|
|
{
|
|
const char *path_lowercased = lowercase_path(path, false, false);
|
|
int result = utime(path_lowercased, times);
|
|
if (path_lowercased != path) {
|
|
free((void *)path_lowercased);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
STEAMAPI_API int __wrap_utimes(const char *path, const struct timeval times[2])
|
|
{
|
|
const char *path_lowercased = lowercase_path(path, false, false);
|
|
int result = utimes(path_lowercased, times);
|
|
if (path_lowercased != path) {
|
|
free((void *)path_lowercased);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
STEAMAPI_API int __wrap_mkdir(const char *path, mode_t mode)
|
|
{
|
|
const char *path_lowercased = lowercase_path(path, true, true);
|
|
int result = mkdir(path_lowercased, mode);
|
|
if (path_lowercased != path) {
|
|
free((void *)path_lowercased);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
STEAMAPI_API int __wrap_rmdir(const char *path)
|
|
{
|
|
const char *path_lowercased = lowercase_path(path, false, false);
|
|
int result = rmdir(path_lowercased);
|
|
if (path_lowercased != path) {
|
|
free((void *)path_lowercased);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
STEAMAPI_API void *__wrap_dlopen(const char *path, int mode)
|
|
{
|
|
const char *path_lowercased = lowercase_path(path, false, false);
|
|
void * result = dlopen(path_lowercased, mode);
|
|
if (path_lowercased != path) {
|
|
free((void *)path_lowercased);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
STEAMAPI_API void *__wrap_dlmopen(Lmid_t lmid, const char *path, int flags)
|
|
{
|
|
const char *path_lowercased = lowercase_path(path, false, false);
|
|
void * result = dlmopen(lmid, path_lowercased, flags);
|
|
if (path_lowercased != path) {
|
|
free((void *)path_lowercased);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
#endif
|