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Diffstat (limited to 'src/core/file_sys/fs_path_utility.h')
| -rw-r--r-- | src/core/file_sys/fs_path_utility.h | 1240 |
1 files changed, 1240 insertions, 0 deletions
diff --git a/src/core/file_sys/fs_path_utility.h b/src/core/file_sys/fs_path_utility.h new file mode 100644 index 000000000..276445707 --- /dev/null +++ b/src/core/file_sys/fs_path_utility.h @@ -0,0 +1,1240 @@ +// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project +// SPDX-License-Identifier: GPL-2.0-or-later + +#pragma once + +#include "common/assert.h" +#include "common/common_types.h" +#include "common/scope_exit.h" +#include "core/file_sys/fs_directory.h" +#include "core/file_sys/fs_memory_management.h" +#include "core/file_sys/fs_string_util.h" +#include "core/hle/result.h" + +namespace FileSys { + +constexpr inline size_t MountNameLengthMax = 15; +using Result = ::Result; + +namespace StringTraits { + +constexpr inline char DirectorySeparator = '/'; +constexpr inline char DriveSeparator = ':'; +constexpr inline char Dot = '.'; +constexpr inline char NullTerminator = '\x00'; + +constexpr inline char AlternateDirectorySeparator = '\\'; + +constexpr inline const char InvalidCharacters[6] = {':', '*', '?', '<', '>', '|'}; +constexpr inline const char InvalidCharactersForHostName[6] = {':', '*', '<', '>', '|', '$'}; +constexpr inline const char InvalidCharactersForMountName[5] = {'*', '?', '<', '>', '|'}; + +namespace impl { + +template <const char* InvalidCharacterSet, size_t NumInvalidCharacters> +consteval u64 MakeInvalidCharacterMask(size_t n) { + u64 mask = 0; + for (size_t i = 0; i < NumInvalidCharacters; ++i) { + if ((static_cast<u64>(InvalidCharacterSet[i]) >> 6) == n) { + mask |= static_cast<u64>(1) << (static_cast<u64>(InvalidCharacterSet[i]) & 0x3F); + } + } + return mask; +} + +template <const char* InvalidCharacterSet, size_t NumInvalidCharacters> +constexpr bool IsInvalidCharacterImpl(char c) { + constexpr u64 Masks[4] = { + MakeInvalidCharacterMask<InvalidCharacterSet, NumInvalidCharacters>(0), + MakeInvalidCharacterMask<InvalidCharacterSet, NumInvalidCharacters>(1), + MakeInvalidCharacterMask<InvalidCharacterSet, NumInvalidCharacters>(2), + MakeInvalidCharacterMask<InvalidCharacterSet, NumInvalidCharacters>(3)}; + + return (Masks[static_cast<u64>(c) >> 6] & + (static_cast<u64>(1) << (static_cast<u64>(c) & 0x3F))) != 0; +} + +} // namespace impl + +constexpr bool IsInvalidCharacter(char c) { + return impl::IsInvalidCharacterImpl<InvalidCharacters, size(InvalidCharacters)>(c); +} +constexpr bool IsInvalidCharacterForHostName(char c) { + return impl::IsInvalidCharacterImpl<InvalidCharactersForHostName, + size(InvalidCharactersForHostName)>(c); +} +constexpr bool IsInvalidCharacterForMountName(char c) { + return impl::IsInvalidCharacterImpl<InvalidCharactersForMountName, + size(InvalidCharactersForMountName)>(c); +} + +} // namespace StringTraits + +constexpr inline size_t WindowsDriveLength = 2; +constexpr inline size_t UncPathPrefixLength = 2; +constexpr inline size_t DosDevicePathPrefixLength = 4; + +class PathFlags { +private: + static constexpr u32 WindowsPathFlag = (1 << 0); + static constexpr u32 RelativePathFlag = (1 << 1); + static constexpr u32 EmptyPathFlag = (1 << 2); + static constexpr u32 MountNameFlag = (1 << 3); + static constexpr u32 BackslashFlag = (1 << 4); + static constexpr u32 AllCharactersFlag = (1 << 5); + +private: + u32 m_value; + +public: + constexpr PathFlags() : m_value(0) { /* ... */ + } + +#define DECLARE_PATH_FLAG_HANDLER(__WHICH__) \ + constexpr bool Is##__WHICH__##Allowed() const { return (m_value & __WHICH__##Flag) != 0; } \ + constexpr void Allow##__WHICH__() { m_value |= __WHICH__##Flag; } + + DECLARE_PATH_FLAG_HANDLER(WindowsPath) + DECLARE_PATH_FLAG_HANDLER(RelativePath) + DECLARE_PATH_FLAG_HANDLER(EmptyPath) + DECLARE_PATH_FLAG_HANDLER(MountName) + DECLARE_PATH_FLAG_HANDLER(Backslash) + DECLARE_PATH_FLAG_HANDLER(AllCharacters) + +#undef DECLARE_PATH_FLAG_HANDLER +}; + +template <typename T> + requires(std::same_as<T, char> || std::same_as<T, wchar_t>) +constexpr inline bool IsDosDevicePath(const T* path) { + ASSERT(path != nullptr); + + using namespace StringTraits; + + return path[0] == AlternateDirectorySeparator && path[1] == AlternateDirectorySeparator && + (path[2] == Dot || path[2] == '?') && + (path[3] == DirectorySeparator || path[3] == AlternateDirectorySeparator); +} + +template <typename T> + requires(std::same_as<T, char> || std::same_as<T, wchar_t>) +constexpr inline bool IsUncPath(const T* path, bool allow_forward_slash = true, + bool allow_back_slash = true) { + ASSERT(path != nullptr); + + using namespace StringTraits; + + return (allow_forward_slash && path[0] == DirectorySeparator && + path[1] == DirectorySeparator) || + (allow_back_slash && path[0] == AlternateDirectorySeparator && + path[1] == AlternateDirectorySeparator); +} + +constexpr inline bool IsWindowsDrive(const char* path) { + ASSERT(path != nullptr); + + return (('a' <= path[0] && path[0] <= 'z') || ('A' <= path[0] && path[0] <= 'Z')) && + path[1] == StringTraits::DriveSeparator; +} + +constexpr inline bool IsWindowsPath(const char* path, bool allow_forward_slash_unc) { + return IsWindowsDrive(path) || IsDosDevicePath(path) || + IsUncPath(path, allow_forward_slash_unc, true); +} + +constexpr inline int GetWindowsSkipLength(const char* path) { + if (IsDosDevicePath(path)) { + return DosDevicePathPrefixLength; + } else if (IsWindowsDrive(path)) { + return WindowsDriveLength; + } else if (IsUncPath(path)) { + return UncPathPrefixLength; + } else { + return 0; + } +} + +constexpr inline bool IsPathAbsolute(const char* path) { + return IsWindowsPath(path, false) || path[0] == StringTraits::DirectorySeparator; +} + +constexpr inline bool IsPathRelative(const char* path) { + return path[0] && !IsPathAbsolute(path); +} + +constexpr inline bool IsCurrentDirectory(const char* path) { + return path[0] == StringTraits::Dot && + (path[1] == StringTraits::NullTerminator || path[1] == StringTraits::DirectorySeparator); +} + +constexpr inline bool IsParentDirectory(const char* path) { + return path[0] == StringTraits::Dot && path[1] == StringTraits::Dot && + (path[2] == StringTraits::NullTerminator || path[2] == StringTraits::DirectorySeparator); +} + +constexpr inline bool IsPathStartWithCurrentDirectory(const char* path) { + return IsCurrentDirectory(path) || IsParentDirectory(path); +} + +constexpr inline bool IsSubPath(const char* lhs, const char* rhs) { + /* Check pre-conditions. */ + ASSERT(lhs != nullptr); + ASSERT(rhs != nullptr); + + /* Import StringTraits names for current scope. */ + using namespace StringTraits; + + /* Special case certain paths. */ + if (IsUncPath(lhs) && !IsUncPath(rhs)) { + return false; + } + if (!IsUncPath(lhs) && IsUncPath(rhs)) { + return false; + } + + if (lhs[0] == DirectorySeparator && lhs[1] == NullTerminator && rhs[0] == DirectorySeparator && + rhs[1] != NullTerminator) { + return true; + } + if (rhs[0] == DirectorySeparator && rhs[1] == NullTerminator && lhs[0] == DirectorySeparator && + lhs[1] != NullTerminator) { + return true; + } + + /* Check subpath. */ + for (size_t i = 0; /* ... */; ++i) { + if (lhs[i] == NullTerminator) { + return rhs[i] == DirectorySeparator; + } else if (rhs[i] == NullTerminator) { + return lhs[i] == DirectorySeparator; + } else if (lhs[i] != rhs[i]) { + return false; + } + } +} + +/* Path utilities. */ +constexpr inline void Replace(char* dst, size_t dst_size, char old_char, char new_char) { + ASSERT(dst != nullptr); + for (char* cur = dst; cur < dst + dst_size && *cur; ++cur) { + if (*cur == old_char) { + *cur = new_char; + } + } +} + +constexpr inline Result CheckUtf8(const char* s) { + /* Check pre-conditions. */ + ASSERT(s != nullptr); + + /* Iterate, checking for utf8-validity. */ + while (*s) { + char utf8_buf[4] = {}; + + const auto pick_res = PickOutCharacterFromUtf8String(utf8_buf, std::addressof(s)); + R_UNLESS(pick_res == CharacterEncodingResult_Success, ResultInvalidPathFormat); + + u32 dummy; + const auto cvt_res = ConvertCharacterUtf8ToUtf32(std::addressof(dummy), utf8_buf); + R_UNLESS(cvt_res == CharacterEncodingResult_Success, ResultInvalidPathFormat); + } + + R_SUCCEED(); +} + +/* Path formatting. */ +class PathNormalizer { +private: + enum class PathState { + Start, + Normal, + FirstSeparator, + Separator, + CurrentDir, + ParentDir, + }; + +private: + static constexpr void ReplaceParentDirectoryPath(char* dst, const char* src) { + /* Use StringTraits names for remainder of scope. */ + using namespace StringTraits; + + /* Start with a dir-separator. */ + dst[0] = DirectorySeparator; + + auto i = 1; + while (src[i] != NullTerminator) { + if ((src[i - 1] == DirectorySeparator || src[i - 1] == AlternateDirectorySeparator) && + src[i + 0] == Dot && src[i + 1] == Dot && + (src[i + 2] == DirectorySeparator || src[i + 2] == AlternateDirectorySeparator)) { + dst[i - 1] = DirectorySeparator; + dst[i + 0] = Dot; + dst[i + 1] = Dot; + dst[i + 2] = DirectorySeparator; + i += 3; + } else { + if (src[i - 1] == AlternateDirectorySeparator && src[i + 0] == Dot && + src[i + 1] == Dot && src[i + 2] == NullTerminator) { + dst[i - 1] = DirectorySeparator; + dst[i + 0] = Dot; + dst[i + 1] = Dot; + i += 2; + break; + } + + dst[i] = src[i]; + ++i; + } + } + + dst[i] = StringTraits::NullTerminator; + } + +public: + static constexpr bool IsParentDirectoryPathReplacementNeeded(const char* path) { + /* Use StringTraits names for remainder of scope. */ + using namespace StringTraits; + + if (path[0] != DirectorySeparator && path[0] != AlternateDirectorySeparator) { + return false; + } + + /* Check to find a parent reference using alternate separators. */ + if (path[0] != NullTerminator && path[1] != NullTerminator && path[2] != NullTerminator) { + size_t i; + for (i = 0; path[i + 3] != NullTerminator; ++path) { + if (path[i + 1] != Dot || path[i + 2] != Dot) { + continue; + } + + const char c0 = path[i + 0]; + const char c3 = path[i + 3]; + + if (c0 == AlternateDirectorySeparator && + (c3 == DirectorySeparator || c3 == AlternateDirectorySeparator || + c3 == NullTerminator)) { + return true; + } + + if (c3 == AlternateDirectorySeparator && + (c0 == DirectorySeparator || c0 == AlternateDirectorySeparator)) { + return true; + } + } + + if (path[i + 0] == AlternateDirectorySeparator && path[i + 1] == Dot && + path[i + 2] == Dot /* && path[i + 3] == NullTerminator */) { + return true; + } + } + + return false; + } + + static constexpr Result IsNormalized(bool* out, size_t* out_len, const char* path, + bool allow_all_characters = false) { + /* Use StringTraits names for remainder of scope. */ + using namespace StringTraits; + + /* Parse the path. */ + auto state = PathState::Start; + size_t len = 0; + while (path[len] != NullTerminator) { + /* Get the current character. */ + const char c = path[len++]; + + /* Check the current character is valid. */ + if (!allow_all_characters && state != PathState::Start) { + R_UNLESS(!IsInvalidCharacter(c), ResultInvalidCharacter); + } + + /* Process depending on current state. */ + switch (state) { + /* Import the PathState enums for convenience. */ + using enum PathState; + + case Start: + R_UNLESS(c == DirectorySeparator, ResultInvalidPathFormat); + state = FirstSeparator; + break; + case Normal: + if (c == DirectorySeparator) { + state = Separator; + } + break; + case FirstSeparator: + case Separator: + if (c == DirectorySeparator) { + *out = false; + R_SUCCEED(); + } + + if (c == Dot) { + state = CurrentDir; + } else { + state = Normal; + } + break; + case CurrentDir: + if (c == DirectorySeparator) { + *out = false; + R_SUCCEED(); + } + + if (c == Dot) { + state = ParentDir; + } else { + state = Normal; + } + break; + case ParentDir: + if (c == DirectorySeparator) { + *out = false; + R_SUCCEED(); + } + + state = Normal; + break; + default: + UNREACHABLE(); + break; + } + } + + /* Check the final state. */ + switch (state) { + /* Import the PathState enums for convenience. */ + using enum PathState; + case Start: + R_THROW(ResultInvalidPathFormat); + case Normal: + case FirstSeparator: + *out = true; + break; + case Separator: + case CurrentDir: + case ParentDir: + *out = false; + break; + default: + UNREACHABLE(); + break; + } + + /* Set the output length. */ + *out_len = len; + R_SUCCEED(); + } + + static Result Normalize(char* dst, size_t* out_len, const char* path, size_t max_out_size, + bool is_windows_path, bool is_drive_relative_path, + bool allow_all_characters = false) { + /* Use StringTraits names for remainder of scope. */ + using namespace StringTraits; + + /* Prepare to iterate. */ + const char* cur_path = path; + size_t total_len = 0; + + /* If path begins with a separator, check that we're not drive relative. */ + if (cur_path[0] != DirectorySeparator) { + R_UNLESS(is_drive_relative_path, ResultInvalidPathFormat); + + dst[total_len++] = DirectorySeparator; + } + + /* We're going to need to do path replacement, potentially. */ + char* replacement_path = nullptr; + size_t replacement_path_size = 0; + + SCOPE_EXIT({ + if (replacement_path != nullptr) { + if (std::is_constant_evaluated()) { + delete[] replacement_path; + } else { + Deallocate(replacement_path, replacement_path_size); + } + } + }); + + /* Perform path replacement, if necessary. */ + if (IsParentDirectoryPathReplacementNeeded(cur_path)) { + if (std::is_constant_evaluated()) { + replacement_path_size = EntryNameLengthMax + 1; + replacement_path = new char[replacement_path_size]; + } else { + replacement_path_size = EntryNameLengthMax + 1; + replacement_path = static_cast<char*>(Allocate(replacement_path_size)); + } + + ReplaceParentDirectoryPath(replacement_path, cur_path); + + cur_path = replacement_path; + } + + /* Iterate, normalizing path components. */ + bool skip_next_sep = false; + size_t i = 0; + + while (cur_path[i] != NullTerminator) { + /* Process a directory separator, if we run into one. */ + if (cur_path[i] == DirectorySeparator) { + /* Swallow separators. */ + do { + ++i; + } while (cur_path[i] == DirectorySeparator); + + /* Check if we hit end of string. */ + if (cur_path[i] == NullTerminator) { + break; + } + + /* If we aren't skipping the separator, write it, checking that we remain in bounds. + */ + if (!skip_next_sep) { + if (total_len + 1 == max_out_size) { + dst[total_len] = NullTerminator; + *out_len = total_len; + R_THROW(ResultTooLongPath); + } + + dst[total_len++] = DirectorySeparator; + } + + /* Don't skip the next separator. */ + skip_next_sep = false; + } + + /* Get the length of the current directory component. */ + size_t dir_len = 0; + while (cur_path[i + dir_len] != DirectorySeparator && + cur_path[i + dir_len] != NullTerminator) { + /* Check for validity. */ + if (!allow_all_characters) { + R_UNLESS(!IsInvalidCharacter(cur_path[i + dir_len]), ResultInvalidCharacter); + } + + ++dir_len; + } + + /* Handle the current dir component. */ + if (IsCurrentDirectory(cur_path + i)) { + skip_next_sep = true; + } else if (IsParentDirectory(cur_path + i)) { + /* We should have just written a separator. */ + ASSERT(dst[total_len - 1] == DirectorySeparator); + + /* We should have started with a separator, for non-windows paths. */ + if (!is_windows_path) { + ASSERT(dst[0] == DirectorySeparator); + } + + /* Remove the previous component. */ + if (total_len == 1) { + R_UNLESS(is_windows_path, ResultDirectoryUnobtainable); + + --total_len; + } else { + total_len -= 2; + + do { + if (dst[total_len] == DirectorySeparator) { + break; + } + } while ((--total_len) != 0); + } + + /* We should be pointing to a directory separator, for non-windows paths. */ + if (!is_windows_path) { + ASSERT(dst[total_len] == DirectorySeparator); + } + + /* We should remain in bounds. */ + ASSERT(total_len < max_out_size); + } else { + /* Copy, possibly truncating. */ + if (total_len + dir_len + 1 > max_out_size) { + const size_t copy_len = max_out_size - (total_len + 1); + + for (size_t j = 0; j < copy_len; ++j) { + dst[total_len++] = cur_path[i + j]; + } + + dst[total_len] = NullTerminator; + *out_len = total_len; + R_THROW(ResultTooLongPath); + } + + for (size_t j = 0; j < dir_len; ++j) { + dst[total_len++] = cur_path[i + j]; + } + } + + /* Advance past the current directory component. */ + i += dir_len; + } + + if (skip_next_sep) { + --total_len; + } + + if (total_len == 0 && max_out_size != 0) { + total_len = 1; + dst[0] = DirectorySeparator; + } + + /* NOTE: Probable nintendo bug, as max_out_size must be at least total_len + 1 for the null + * terminator. */ + R_UNLESS(max_out_size >= total_len - 1, ResultTooLongPath); + + dst[total_len] = NullTerminator; + + /* Check that the result path is normalized. */ + bool is_normalized; + size_t dummy; + R_TRY(IsNormalized(std::addressof(is_normalized), std::addressof(dummy), dst, + allow_all_characters)); + + /* Assert that the result path is normalized. */ + ASSERT(is_normalized); + + /* Set the output length. */ + *out_len = total_len; + R_SUCCEED(); + } +}; + +class PathFormatter { +private: + static constexpr Result CheckSharedName(const char* name, size_t len) { + /* Use StringTraits names for remainder of scope. */ + using namespace StringTraits; + + if (len == 1) { + R_UNLESS(name[0] != Dot, ResultInvalidPathFormat); + } else if (len == 2) { + R_UNLESS(name[0] != Dot || name[1] != Dot, ResultInvalidPathFormat); + } + + for (size_t i = 0; i < len; ++i) { + R_UNLESS(!IsInvalidCharacter(name[i]), ResultInvalidCharacter); + } + + R_SUCCEED(); + } + + static constexpr Result CheckHostName(const char* name, size_t len) { + /* Use StringTraits names for remainder of scope. */ + using namespace StringTraits; + + if (len == 2) { + R_UNLESS(name[0] != Dot || name[1] != Dot, ResultInvalidPathFormat); + } + + for (size_t i = 0; i < len; ++i) { + R_UNLESS(!IsInvalidCharacterForHostName(name[i]), ResultInvalidCharacter); + } + + R_SUCCEED(); + } + + static constexpr Result CheckInvalidBackslash(bool* out_contains_backslash, const char* path, + bool allow_backslash) { + /* Use StringTraits names for remainder of scope. */ + using namespace StringTraits; + + /* Default to no backslashes, so we can just write if we see one. */ + *out_contains_backslash = false; + + while (*path != NullTerminator) { + if (*(path++) == AlternateDirectorySeparator) { + *out_contains_backslash = true; + + R_UNLESS(allow_backslash, ResultInvalidCharacter); + } + } + + R_SUCCEED(); + } + +public: + static constexpr Result CheckPathFormat(const char* path, const PathFlags& flags) { + bool normalized; + size_t len; + R_RETURN(IsNormalized(std::addressof(normalized), std::addressof(len), path, flags)); + } + + static constexpr Result SkipMountName(const char** out, size_t* out_len, const char* path) { + R_RETURN(ParseMountName(out, out_len, nullptr, 0, path)); + } + + static constexpr Result ParseMountName(const char** out, size_t* out_len, char* out_mount_name, + size_t out_mount_name_buffer_size, const char* path) { + /* Check pre-conditions. */ + ASSERT(path != nullptr); + ASSERT(out_len != nullptr); + ASSERT(out != nullptr); + ASSERT((out_mount_name == nullptr) == (out_mount_name_buffer_size == 0)); + + /* Use StringTraits names for remainder of scope. */ + using namespace StringTraits; + + /* Determine max mount length. */ + const auto max_mount_len = + out_mount_name_buffer_size == 0 + ? MountNameLengthMax + 1 + : std::min(MountNameLengthMax + 1, out_mount_name_buffer_size); + + /* Parse the path until we see a drive separator. */ + size_t mount_len = 0; + for (/* ... */; mount_len < max_mount_len && path[mount_len]; ++mount_len) { + const char c = path[mount_len]; + + /* If we see a drive separator, advance, then we're done with the pre-drive separator + * part of the mount. */ + if (c == DriveSeparator) { + ++mount_len; + break; + } + + /* If we see a directory separator, we're not in a mount name. */ + if (c == DirectorySeparator || c == AlternateDirectorySeparator) { + *out = path; + *out_len = 0; + R_SUCCEED(); + } + } + + /* Check to be sure we're actually looking at a mount name. */ + if (mount_len <= 2 || path[mount_len - 1] != DriveSeparator) { + *out = path; + *out_len = 0; + R_SUCCEED(); + } + + /* Check that all characters in the mount name are allowable. */ + for (size_t i = 0; i < mount_len; ++i) { + R_UNLESS(!IsInvalidCharacterForMountName(path[i]), ResultInvalidCharacter); + } + + /* Copy out the mount name. */ + if (out_mount_name_buffer_size > 0) { + R_UNLESS(mount_len < out_mount_name_buffer_size, ResultTooLongPath); + + for (size_t i = 0; i < mount_len; ++i) { + out_mount_name[i] = path[i]; + } + out_mount_name[mount_len] = NullTerminator; + } + + /* Set the output. */ + *out = path + mount_len; + *out_len = mount_len; + R_SUCCEED(); + } + + static constexpr Result SkipRelativeDotPath(const char** out, size_t* out_len, + const char* path) { + R_RETURN(ParseRelativeDotPath(out, out_len, nullptr, 0, path)); + } + + static constexpr Result ParseRelativeDotPath(const char** out, size_t* out_len, + char* out_relative, + size_t out_relative_buffer_size, + const char* path) { + /* Check pre-conditions. */ + ASSERT(path != nullptr); + ASSERT(out_len != nullptr); + ASSERT(out != nullptr); + ASSERT((out_relative == nullptr) == (out_relative_buffer_size == 0)); + + /* Use StringTraits names for remainder of scope. */ + using namespace StringTraits; + + /* Initialize the output buffer, if we have one. */ + if (out_relative_buffer_size > 0) { + out_relative[0] = NullTerminator; + } + + /* Check if the path is relative. */ + if (path[0] == Dot && (path[1] == NullTerminator || path[1] == DirectorySeparator || + path[1] == AlternateDirectorySeparator)) { + if (out_relative_buffer_size > 0) { + R_UNLESS(out_relative_buffer_size >= 2, ResultTooLongPath); + + out_relative[0] = Dot; + out_relative[1] = NullTerminator; + } + + *out = path + 1; + *out_len = 1; + R_SUCCEED(); + } + + /* Ensure the path isn't a parent directory. */ + R_UNLESS(!(path[0] == Dot && path[1] == Dot), ResultDirectoryUnobtainable); + + /* There was no relative dot path. */ + *out = path; + *out_len = 0; + R_SUCCEED(); + } + + static constexpr Result SkipWindowsPath(const char** out, size_t* out_len, bool* out_normalized, + const char* path, bool has_mount_name) { + /* We're normalized if and only if the parsing doesn't throw ResultNotNormalized(). */ + *out_normalized = true; + + R_TRY_CATCH(ParseWindowsPath(out, out_len, nullptr, 0, path, has_mount_name)) { + R_CATCH(ResultNotNormalized) { + *out_normalized = false; + } + } + R_END_TRY_CATCH; + ON_RESULT_INCLUDED(ResultNotNormalized) { + *out_normalized = false; + }; + + R_SUCCEED(); + } + + static constexpr Result ParseWindowsPath(const char** out, size_t* out_len, char* out_win, + size_t out_win_buffer_size, const char* path, + bool has_mount_name) { + /* Check pre-conditions. */ + ASSERT(path != nullptr); + ASSERT(out_len != nullptr); + ASSERT(out != nullptr); + ASSERT((out_win == nullptr) == (out_win_buffer_size == 0)); + + /* Use StringTraits names for remainder of scope. */ + using namespace StringTraits; + + /* Initialize the output buffer, if we have one. */ + if (out_win_buffer_size > 0) { + out_win[0] = NullTerminator; + } + + /* Handle path start. */ + const char* cur_path = path; + if (has_mount_name && path[0] == DirectorySeparator) { + if (path[1] == AlternateDirectorySeparator && path[2] == AlternateDirectorySeparator) { + R_UNLESS(out_win_buffer_size > 0, ResultNotNormalized); + + ++cur_path; + } else if (IsWindowsDrive(path + 1)) { + R_UNLESS(out_win_buffer_size > 0, ResultNotNormalized); + + ++cur_path; + } + } + + /* Handle windows drive. */ + if (IsWindowsDrive(cur_path)) { + /* Parse up to separator. */ + size_t win_path_len = WindowsDriveLength; + for (/* ... */; cur_path[win_path_len] != NullTerminator; ++win_path_len) { + R_UNLESS(!IsInvalidCharacter(cur_path[win_path_len]), ResultInvalidCharacter); + + if (cur_path[win_path_len] == DirectorySeparator || + cur_path[win_path_len] == AlternateDirectorySeparator) { + break; + } + } + + /* Ensure that we're normalized, if we're required to be. */ + if (out_win_buffer_size == 0) { + for (size_t i = 0; i < win_path_len; ++i) { + R_UNLESS(cur_path[i] != AlternateDirectorySeparator, ResultNotNormalized); + } + } else { + /* Ensure we can copy into the normalized buffer. */ + R_UNLESS(win_path_len < out_win_buffer_size, ResultTooLongPath); + + for (size_t i = 0; i < win_path_len; ++i) { + out_win[i] = cur_path[i]; + } + out_win[win_path_len] = NullTerminator; + + Replace(out_win, win_path_len, AlternateDirectorySeparator, DirectorySeparator); + } + + *out = cur_path + win_path_len; + *out_len = win_path_len; + R_SUCCEED(); + } + + /* Handle DOS device. */ + if (IsDosDevicePath(cur_path)) { + size_t dos_prefix_len = DosDevicePathPrefixLength; + + if (IsWindowsDrive(cur_path + dos_prefix_len)) { + dos_prefix_len += WindowsDriveLength; + } else { + --dos_prefix_len; + } + + if (out_win_buffer_size > 0) { + /* Ensure we can copy into the normalized buffer. */ + R_UNLESS(dos_prefix_len < out_win_buffer_size, ResultTooLongPath); + + for (size_t i = 0; i < dos_prefix_len; ++i) { + out_win[i] = cur_path[i]; + } + out_win[dos_prefix_len] = NullTerminator; + + Replace(out_win, dos_prefix_len, DirectorySeparator, AlternateDirectorySeparator); + } + + *out = cur_path + dos_prefix_len; + *out_len = dos_prefix_len; + R_SUCCEED(); + } + + /* Handle UNC path. */ + if (IsUncPath(cur_path, false, true)) { + const char* final_path = cur_path; + + R_UNLESS(cur_path[UncPathPrefixLength] != DirectorySeparator, ResultInvalidPathFormat); + R_UNLESS(cur_path[UncPathPrefixLength] != AlternateDirectorySeparator, + ResultInvalidPathFormat); + + size_t cur_component_offset = 0; + size_t pos = UncPathPrefixLength; + for (/* ... */; cur_path[pos] != NullTerminator; ++pos) { + if (cur_path[pos] == DirectorySeparator || + cur_path[pos] == AlternateDirectorySeparator) { + if (cur_component_offset != 0) { + R_TRY(CheckSharedName(cur_path + cur_component_offset, + pos - cur_component_offset)); + + final_path = cur_path + pos; + break; + } + + R_UNLESS(cur_path[pos + 1] != DirectorySeparator, ResultInvalidPathFormat); + R_UNLESS(cur_path[pos + 1] != AlternateDirectorySeparator, + ResultInvalidPathFormat); + + R_TRY(CheckHostName(cur_path + 2, pos - 2)); + + cur_component_offset = pos + 1; + } + } + + R_UNLESS(cur_component_offset != pos, ResultInvalidPathFormat); + + if (cur_component_offset != 0 && final_path == cur_path) { + R_TRY(CheckSharedName(cur_path + cur_component_offset, pos - cur_component_offset)); + + final_path = cur_path + pos; + } + + size_t unc_prefix_len = final_path - cur_path; + + /* Ensure that we're normalized, if we're required to be. */ + if (out_win_buffer_size == 0) { + for (size_t i = 0; i < unc_prefix_len; ++i) { + R_UNLESS(cur_path[i] != DirectorySeparator, ResultNotNormalized); + } + } else { + /* Ensure we can copy into the normalized buffer. */ + R_UNLESS(unc_prefix_len < out_win_buffer_size, ResultTooLongPath); + + for (size_t i = 0; i < unc_prefix_len; ++i) { + out_win[i] = cur_path[i]; + } + out_win[unc_prefix_len] = NullTerminator; + + Replace(out_win, unc_prefix_len, DirectorySeparator, AlternateDirectorySeparator); + } + + *out = cur_path + unc_prefix_len; + *out_len = unc_prefix_len; + R_SUCCEED(); + } + + /* There's no windows path to parse. */ + *out = path; + *out_len = 0; + R_SUCCEED(); + } + + static constexpr Result IsNormalized(bool* out, size_t* out_len, const char* path, + const PathFlags& flags = {}) { + /* Ensure nothing is null. */ + R_UNLESS(out != nullptr, ResultNullptrArgument); + R_UNLESS(out_len != nullptr, ResultNullptrArgument); + R_UNLESS(path != nullptr, ResultNullptrArgument); + + /* Verify that the path is valid utf-8. */ + R_TRY(CheckUtf8(path)); + + /* Use StringTraits names for remainder of scope. */ + using namespace StringTraits; + + /* Handle the case where the path is empty. */ + if (path[0] == NullTerminator) { + R_UNLESS(flags.IsEmptyPathAllowed(), ResultInvalidPathFormat); + + *out = true; + *out_len = 0; + R_SUCCEED(); + } + + /* All normalized paths start with a directory separator...unless they're windows paths, + * relative paths, or have mount names. */ + if (path[0] != DirectorySeparator) { + R_UNLESS(flags.IsWindowsPathAllowed() || flags.IsRelativePathAllowed() || + flags.IsMountNameAllowed(), + ResultInvalidPathFormat); + } + + /* Check that the path is allowed to be a windows path, if it is. */ + if (IsWindowsPath(path, false)) { + R_UNLESS(flags.IsWindowsPathAllowed(), ResultInvalidPathFormat); + } + + /* Skip past the mount name, if one is present. */ + size_t total_len = 0; + size_t mount_name_len = 0; + R_TRY(SkipMountName(std::addressof(path), std::addressof(mount_name_len), path)); + + /* If we had a mount name, check that that was allowed. */ + if (mount_name_len > 0) { + R_UNLESS(flags.IsMountNameAllowed(), ResultInvalidPathFormat); + + total_len += mount_name_len; + } + + /* Check that the path starts as a normalized path should. */ + if (path[0] != DirectorySeparator && !IsPathStartWithCurrentDirectory(path) && + !IsWindowsPath(path, false)) { + R_UNLESS(flags.IsRelativePathAllowed(), ResultInvalidPathFormat); + R_UNLESS(!IsInvalidCharacter(path[0]), ResultInvalidPathFormat); + + *out = false; + R_SUCCEED(); + } + + /* Process relative path. */ + size_t relative_len = 0; + R_TRY(SkipRelativeDotPath(std::addressof(path), std::addressof(relative_len), path)); + + /* If we have a relative path, check that was allowed. */ + if (relative_len > 0) { + R_UNLESS(flags.IsRelativePathAllowed(), ResultInvalidPathFormat); + + total_len += relative_len; + + if (path[0] == NullTerminator) { + *out = true; + *out_len = total_len; + R_SUCCEED(); + } + } + + /* Process windows path. */ + size_t windows_len = 0; + bool normalized_win = false; + R_TRY(SkipWindowsPath(std::addressof(path), std::addressof(windows_len), + std::addressof(normalized_win), path, mount_name_len > 0)); + + /* If the windows path wasn't normalized, we're not normalized. */ + if (!normalized_win) { + R_UNLESS(flags.IsWindowsPathAllowed(), ResultInvalidPathFormat); + + *out = false; + R_SUCCEED(); + } + + /* If we had a windows path, check that was allowed. */ + if (windows_len > 0) { + R_UNLESS(flags.IsWindowsPathAllowed(), ResultInvalidPathFormat); + + total_len += windows_len; + + /* We can't have both a relative path and a windows path. */ + R_UNLESS(relative_len == 0, ResultInvalidPathFormat); + + /* A path ending in a windows path isn't normalized. */ + if (path[0] == NullTerminator) { + *out = false; + R_SUCCEED(); + } + + /* Check that there are no windows directory separators in the path. */ + for (size_t i = 0; path[i] != NullTerminator; ++i) { + if (path[i] == AlternateDirectorySeparator) { + *out = false; + R_SUCCEED(); + } + } + } + + /* Check that parent directory replacement is not needed if backslashes are allowed. */ + if (flags.IsBackslashAllowed() && + PathNormalizer::IsParentDirectoryPathReplacementNeeded(path)) { + *out = false; + R_SUCCEED(); + } + + /* Check that the backslash state is valid. */ + bool is_backslash_contained = false; + R_TRY(CheckInvalidBackslash(std::addressof(is_backslash_contained), path, + flags.IsWindowsPathAllowed() || flags.IsBackslashAllowed())); + + /* Check that backslashes are contained only if allowed. */ + if (is_backslash_contained && !flags.IsBackslashAllowed()) { + *out = false; + R_SUCCEED(); + } + + /* Check that the final result path is normalized. */ + size_t normal_len = 0; + R_TRY(PathNormalizer::IsNormalized(out, std::addressof(normal_len), path, + flags.IsAllCharactersAllowed())); + + /* Add the normal length. */ + total_len += normal_len; + + /* Set the output length. */ + *out_len = total_len; + R_SUCCEED(); + } + + static Result Normalize(char* dst, size_t dst_size, const char* path, size_t path_len, + const PathFlags& flags) { + /* Use StringTraits names for remainder of scope. */ + using namespace StringTraits; + + /* Prepare to iterate. */ + const char* src = path; + size_t cur_pos = 0; + bool is_windows_path = false; + + /* Check if the path is empty. */ + if (src[0] == NullTerminator) { + if (dst_size != 0) { + dst[0] = NullTerminator; + } + + R_UNLESS(flags.IsEmptyPathAllowed(), ResultInvalidPathFormat); + + R_SUCCEED(); + } + + /* Handle a mount name. */ + size_t mount_name_len = 0; + if (flags.IsMountNameAllowed()) { + R_TRY(ParseMountName(std::addressof(src), std::addressof(mount_name_len), dst + cur_pos, + dst_size - cur_pos, src)); + + cur_pos += mount_name_len; + } + + /* Handle a drive-relative prefix. */ + bool is_drive_relative = false; + if (src[0] != DirectorySeparator && !IsPathStartWithCurrentDirectory(src) && + !IsWindowsPath(src, false)) { + R_UNLESS(flags.IsRelativePathAllowed(), ResultInvalidPathFormat); + R_UNLESS(!IsInvalidCharacter(src[0]), ResultInvalidPathFormat); + + dst[cur_pos++] = Dot; + is_drive_relative = true; + } + + size_t relative_len = 0; + if (flags.IsRelativePathAllowed()) { + R_UNLESS(cur_pos < dst_size, ResultTooLongPath); + + R_TRY(ParseRelativeDotPath(std::addressof(src), std::addressof(relative_len), + dst + cur_pos, dst_size - cur_pos, src)); + + cur_pos += relative_len; + + if (src[0] == NullTerminator) { + R_UNLESS(cur_pos < dst_size, ResultTooLongPath); + + dst[cur_pos] = NullTerminator; + R_SUCCEED(); + } + } + + /* Handle a windows path. */ + if (flags.IsWindowsPathAllowed()) { + const char* const orig = src; + + R_UNLESS(cur_pos < dst_size, ResultTooLongPath); + + size_t windows_len = 0; + R_TRY(ParseWindowsPath(std::addressof(src), std::addressof(windows_len), dst + cur_pos, + dst_size - cur_pos, src, mount_name_len != 0)); + + cur_pos += windows_len; + + if (src[0] == NullTerminator) { + /* NOTE: Bug in original code here repeated, should be checking cur_pos + 2. */ + R_UNLESS(cur_pos + 1 < dst_size, ResultTooLongPath); + + dst[cur_pos + 0] = DirectorySeparator; + dst[cur_pos + 1] = NullTerminator; + R_SUCCEED(); + } + + if ((src - orig) > 0) { + is_windows_path = true; + } + } + + /* Check for invalid backslash. */ + bool backslash_contained = false; + R_TRY(CheckInvalidBackslash(std::addressof(backslash_contained), src, + flags.IsWindowsPathAllowed() || flags.IsBackslashAllowed())); + + /* Handle backslash replacement as necessary. */ + if (backslash_contained && flags.IsWindowsPathAllowed()) { + /* Create a temporary buffer holding a slash-replaced version of the path. */ + /* NOTE: Nintendo unnecessarily allocates and replaces here a fully copy of the path, + * despite having skipped some of it already. */ + const size_t replaced_src_len = path_len - (src - path); + + char* replaced_src = nullptr; + SCOPE_EXIT({ + if (replaced_src != nullptr) { + if (std::is_constant_evaluated()) { + delete[] replaced_src; + } else { + Deallocate(replaced_src, replaced_src_len); + } + } + }); + + if (std::is_constant_evaluated()) { + replaced_src = new char[replaced_src_len]; + } else { + replaced_src = static_cast<char*>(Allocate(replaced_src_len)); + } + + Strlcpy<char>(replaced_src, src, replaced_src_len); + + Replace(replaced_src, replaced_src_len, AlternateDirectorySeparator, + DirectorySeparator); + + size_t dummy; + R_TRY(PathNormalizer::Normalize(dst + cur_pos, std::addressof(dummy), replaced_src, + dst_size - cur_pos, is_windows_path, is_drive_relative, + flags.IsAllCharactersAllowed())); + } else { + /* We can just do normalization. */ + size_t dummy; + R_TRY(PathNormalizer::Normalize(dst + cur_pos, std::addressof(dummy), src, + dst_size - cur_pos, is_windows_path, is_drive_relative, + flags.IsAllCharactersAllowed())); + } + + R_SUCCEED(); + } +}; + +} // namespace FileSys |