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FileSys: add PathParser
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5 changed files with 200 additions and 0 deletions
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@ -24,6 +24,7 @@ set(SRCS
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file_sys/archive_systemsavedata.cpp
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file_sys/disk_archive.cpp
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file_sys/ivfc_archive.cpp
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file_sys/path_parser.cpp
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gdbstub/gdbstub.cpp
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hle/config_mem.cpp
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hle/hle.cpp
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@ -168,6 +169,7 @@ set(HEADERS
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file_sys/disk_archive.h
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file_sys/file_backend.h
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file_sys/ivfc_archive.h
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file_sys/path_parser.h
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gdbstub/gdbstub.h
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hle/config_mem.h
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hle/function_wrappers.h
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98
src/core/file_sys/path_parser.cpp
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98
src/core/file_sys/path_parser.cpp
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// Copyright 2016 Citra Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#include <algorithm>
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#include <set>
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#include "common/file_util.h"
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#include "common/string_util.h"
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#include "core/file_sys/path_parser.h"
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namespace FileSys {
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PathParser::PathParser(const Path& path) {
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if (path.GetType() != LowPathType::Char && path.GetType() != LowPathType::Wchar) {
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is_valid = false;
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return;
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}
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auto path_string = path.AsString();
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if (path_string.size() == 0 || path_string[0] != '/') {
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is_valid = false;
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return;
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}
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// Filter out invalid characters for the host system.
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// Although some of these characters are valid on 3DS, they are unlikely to be used by games.
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if (std::find_if(path_string.begin(), path_string.end(), [](char c) {
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static const std::set<char> invalid_chars{'<', '>', '\\', '|', ':', '\"', '*', '?'};
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return invalid_chars.find(c) != invalid_chars.end();
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}) != path_string.end()) {
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is_valid = false;
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return;
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}
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Common::SplitString(path_string, '/', path_sequence);
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auto begin = path_sequence.begin();
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auto end = path_sequence.end();
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end = std::remove_if(begin, end, [](std::string& str) { return str == "" || str == "."; });
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path_sequence = std::vector<std::string>(begin, end);
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// checks if the path is out of bounds.
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int level = 0;
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for (auto& node : path_sequence) {
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if (node == "..") {
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--level;
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if (level < 0) {
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is_valid = false;
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return;
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}
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} else {
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++level;
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}
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}
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is_valid = true;
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is_root = level == 0;
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}
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PathParser::HostStatus PathParser::GetHostStatus(const std::string& mount_point) const {
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auto path = mount_point;
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if (!FileUtil::IsDirectory(path))
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return InvalidMountPoint;
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if (path_sequence.empty()) {
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return DirectoryFound;
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}
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for (auto iter = path_sequence.begin(); iter != path_sequence.end() - 1; iter++) {
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if (path.back() != '/')
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path += '/';
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path += *iter;
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if (!FileUtil::Exists(path))
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return PathNotFound;
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if (FileUtil::IsDirectory(path))
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continue;
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return FileInPath;
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}
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path += "/" + path_sequence.back();
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if (!FileUtil::Exists(path))
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return NotFound;
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if (FileUtil::IsDirectory(path))
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return DirectoryFound;
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return FileFound;
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}
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std::string PathParser::BuildHostPath(const std::string& mount_point) const {
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std::string path = mount_point;
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for (auto& node : path_sequence) {
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if (path.back() != '/')
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path += '/';
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path += node;
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}
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return path;
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}
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} // namespace FileSys
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61
src/core/file_sys/path_parser.h
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src/core/file_sys/path_parser.h
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// Copyright 2016 Citra Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#pragma once
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#include <string>
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#include <vector>
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#include "core/file_sys/archive_backend.h"
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namespace FileSys {
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/**
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* A helper class parsing and verifying a string-type Path.
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* Every archives with a sub file system should use this class to parse the path argument and check
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* the status of the file / directory in question on the host file system.
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*/
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class PathParser {
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public:
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PathParser(const Path& path);
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/**
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* Checks if the Path is valid.
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* This function should be called once a PathParser is constructed.
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* A Path is valid if:
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* - it is a string path (with type LowPathType::Char or LowPathType::Wchar),
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* - it starts with "/" (this seems a hard requirement in real 3DS),
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* - it doesn't contain invalid characters, and
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* - it doesn't go out of the root directory using "..".
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*/
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bool IsValid() const {
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return is_valid;
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}
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/// Checks if the Path represents the root directory.
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bool IsRootDirectory() const {
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return is_root;
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}
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enum HostStatus {
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InvalidMountPoint,
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PathNotFound, // "/a/b/c" when "a" doesn't exist
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FileInPath, // "/a/b/c" when "a" is a file
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FileFound, // "/a/b/c" when "c" is a file
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DirectoryFound, // "/a/b/c" when "c" is a directory
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NotFound // "/a/b/c" when "a/b/" exists but "c" doesn't exist
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};
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/// Checks the status of the specified file / directory by the Path on the host file system.
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HostStatus GetHostStatus(const std::string& mount_point) const;
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/// Builds a full path on the host file system.
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std::string BuildHostPath(const std::string& mount_point) const;
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private:
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std::vector<std::string> path_sequence;
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bool is_valid{};
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bool is_root{};
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};
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} // namespace FileSys
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@ -1,5 +1,6 @@
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set(SRCS
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tests.cpp
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core/file_sys/path_parser.cpp
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)
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set(HEADERS
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38
src/tests/core/file_sys/path_parser.cpp
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38
src/tests/core/file_sys/path_parser.cpp
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// Copyright 2016 Citra Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#include <catch.hpp>
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#include "common/file_util.h"
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#include "core/file_sys/path_parser.h"
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namespace FileSys {
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TEST_CASE("PathParser", "[core][file_sys]") {
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REQUIRE(!PathParser(Path(std::vector<u8>{})).IsValid());
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REQUIRE(!PathParser(Path("a")).IsValid());
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REQUIRE(!PathParser(Path("/|")).IsValid());
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REQUIRE(PathParser(Path("/a")).IsValid());
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REQUIRE(!PathParser(Path("/a/b/../../c/../../d")).IsValid());
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REQUIRE(PathParser(Path("/a/b/../c/../../d")).IsValid());
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REQUIRE(PathParser(Path("/")).IsRootDirectory());
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REQUIRE(!PathParser(Path("/a")).IsRootDirectory());
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REQUIRE(PathParser(Path("/a/..")).IsRootDirectory());
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}
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TEST_CASE("PathParser - Host file system", "[core][file_sys]") {
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std::string test_dir = "./test";
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FileUtil::CreateDir(test_dir);
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FileUtil::CreateDir(test_dir + "/z");
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FileUtil::CreateEmptyFile(test_dir + "/a");
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REQUIRE(PathParser(Path("/a")).GetHostStatus(test_dir) == PathParser::FileFound);
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REQUIRE(PathParser(Path("/b")).GetHostStatus(test_dir) == PathParser::NotFound);
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REQUIRE(PathParser(Path("/z")).GetHostStatus(test_dir) == PathParser::DirectoryFound);
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REQUIRE(PathParser(Path("/a/c")).GetHostStatus(test_dir) == PathParser::FileInPath);
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REQUIRE(PathParser(Path("/b/c")).GetHostStatus(test_dir) == PathParser::PathNotFound);
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FileUtil::DeleteDirRecursively(test_dir);
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}
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} // namespace FileSys
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