mirror of
https://github.com/yuzu-emu/yuzu.git
synced 2024-06-03 00:00:01 +00:00
310c1f50be
Allows the use of the macro in constexpr-contexts. Also avoids some potential problems when nesting braces inside it.
1240 lines
43 KiB
C++
1240 lines
43 KiB
C++
// SPDX-FileCopyrightText: Copyright 2024 yuzu Emulator Project
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// SPDX-License-Identifier: GPL-2.0-or-later
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#pragma once
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#include "common/assert.h"
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#include "common/common_funcs.h"
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#include "common/common_types.h"
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#include "common/scope_exit.h"
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#include "core/file_sys/fs_directory.h"
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#include "core/file_sys/fs_memory_management.h"
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#include "core/file_sys/fs_string_util.h"
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#include "core/hle/result.h"
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namespace FileSys {
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constexpr inline size_t MountNameLengthMax = 15;
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namespace StringTraits {
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constexpr inline char DirectorySeparator = '/';
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constexpr inline char DriveSeparator = ':';
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constexpr inline char Dot = '.';
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constexpr inline char NullTerminator = '\x00';
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constexpr inline char AlternateDirectorySeparator = '\\';
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constexpr inline const char InvalidCharacters[6] = {':', '*', '?', '<', '>', '|'};
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constexpr inline const char InvalidCharactersForHostName[6] = {':', '*', '<', '>', '|', '$'};
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constexpr inline const char InvalidCharactersForMountName[5] = {'*', '?', '<', '>', '|'};
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namespace impl {
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template <const char* InvalidCharacterSet, size_t NumInvalidCharacters>
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consteval u64 MakeInvalidCharacterMask(size_t n) {
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u64 mask = 0;
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for (size_t i = 0; i < NumInvalidCharacters; ++i) {
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if ((static_cast<u64>(InvalidCharacterSet[i]) >> 6) == n) {
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mask |= static_cast<u64>(1) << (static_cast<u64>(InvalidCharacterSet[i]) & 0x3F);
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}
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}
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return mask;
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}
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template <const char* InvalidCharacterSet, size_t NumInvalidCharacters>
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constexpr bool IsInvalidCharacterImpl(char c) {
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constexpr u64 Masks[4] = {
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MakeInvalidCharacterMask<InvalidCharacterSet, NumInvalidCharacters>(0),
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MakeInvalidCharacterMask<InvalidCharacterSet, NumInvalidCharacters>(1),
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MakeInvalidCharacterMask<InvalidCharacterSet, NumInvalidCharacters>(2),
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MakeInvalidCharacterMask<InvalidCharacterSet, NumInvalidCharacters>(3)};
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return (Masks[static_cast<u64>(c) >> 6] &
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(static_cast<u64>(1) << (static_cast<u64>(c) & 0x3F))) != 0;
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}
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} // namespace impl
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constexpr bool IsInvalidCharacter(char c) {
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return impl::IsInvalidCharacterImpl<InvalidCharacters, Common::Size(InvalidCharacters)>(c);
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}
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constexpr bool IsInvalidCharacterForHostName(char c) {
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return impl::IsInvalidCharacterImpl<InvalidCharactersForHostName,
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Common::Size(InvalidCharactersForHostName)>(c);
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}
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constexpr bool IsInvalidCharacterForMountName(char c) {
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return impl::IsInvalidCharacterImpl<InvalidCharactersForMountName,
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Common::Size(InvalidCharactersForMountName)>(c);
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}
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} // namespace StringTraits
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constexpr inline size_t WindowsDriveLength = 2;
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constexpr inline size_t UncPathPrefixLength = 2;
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constexpr inline size_t DosDevicePathPrefixLength = 4;
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class PathFlags {
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private:
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static constexpr u32 WindowsPathFlag = (1 << 0);
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static constexpr u32 RelativePathFlag = (1 << 1);
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static constexpr u32 EmptyPathFlag = (1 << 2);
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static constexpr u32 MountNameFlag = (1 << 3);
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static constexpr u32 BackslashFlag = (1 << 4);
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static constexpr u32 AllCharactersFlag = (1 << 5);
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private:
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u32 m_value;
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public:
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constexpr PathFlags() : m_value(0) { /* ... */
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}
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#define DECLARE_PATH_FLAG_HANDLER(__WHICH__) \
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constexpr bool Is##__WHICH__##Allowed() const { return (m_value & __WHICH__##Flag) != 0; } \
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constexpr void Allow##__WHICH__() { m_value |= __WHICH__##Flag; }
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DECLARE_PATH_FLAG_HANDLER(WindowsPath)
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DECLARE_PATH_FLAG_HANDLER(RelativePath)
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DECLARE_PATH_FLAG_HANDLER(EmptyPath)
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DECLARE_PATH_FLAG_HANDLER(MountName)
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DECLARE_PATH_FLAG_HANDLER(Backslash)
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DECLARE_PATH_FLAG_HANDLER(AllCharacters)
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#undef DECLARE_PATH_FLAG_HANDLER
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};
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template <typename T>
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requires(std::same_as<T, char> || std::same_as<T, wchar_t>)
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constexpr inline bool IsDosDevicePath(const T* path) {
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ASSERT(path != nullptr);
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using namespace StringTraits;
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return path[0] == AlternateDirectorySeparator && path[1] == AlternateDirectorySeparator &&
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(path[2] == Dot || path[2] == '?') &&
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(path[3] == DirectorySeparator || path[3] == AlternateDirectorySeparator);
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}
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template <typename T>
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requires(std::same_as<T, char> || std::same_as<T, wchar_t>)
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constexpr inline bool IsUncPath(const T* path, bool allow_forward_slash = true,
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bool allow_back_slash = true) {
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ASSERT(path != nullptr);
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using namespace StringTraits;
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return (allow_forward_slash && path[0] == DirectorySeparator &&
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path[1] == DirectorySeparator) ||
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(allow_back_slash && path[0] == AlternateDirectorySeparator &&
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path[1] == AlternateDirectorySeparator);
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}
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constexpr inline bool IsWindowsDrive(const char* path) {
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ASSERT(path != nullptr);
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return (('a' <= path[0] && path[0] <= 'z') || ('A' <= path[0] && path[0] <= 'Z')) &&
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path[1] == StringTraits::DriveSeparator;
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}
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constexpr inline bool IsWindowsPath(const char* path, bool allow_forward_slash_unc) {
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return IsWindowsDrive(path) || IsDosDevicePath(path) ||
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IsUncPath(path, allow_forward_slash_unc, true);
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}
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constexpr inline int GetWindowsSkipLength(const char* path) {
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if (IsDosDevicePath(path)) {
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return DosDevicePathPrefixLength;
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} else if (IsWindowsDrive(path)) {
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return WindowsDriveLength;
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} else if (IsUncPath(path)) {
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return UncPathPrefixLength;
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} else {
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return 0;
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}
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}
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constexpr inline bool IsPathAbsolute(const char* path) {
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return IsWindowsPath(path, false) || path[0] == StringTraits::DirectorySeparator;
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}
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constexpr inline bool IsPathRelative(const char* path) {
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return path[0] && !IsPathAbsolute(path);
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}
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constexpr inline bool IsCurrentDirectory(const char* path) {
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return path[0] == StringTraits::Dot &&
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(path[1] == StringTraits::NullTerminator || path[1] == StringTraits::DirectorySeparator);
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}
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constexpr inline bool IsParentDirectory(const char* path) {
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return path[0] == StringTraits::Dot && path[1] == StringTraits::Dot &&
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(path[2] == StringTraits::NullTerminator || path[2] == StringTraits::DirectorySeparator);
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}
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constexpr inline bool IsPathStartWithCurrentDirectory(const char* path) {
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return IsCurrentDirectory(path) || IsParentDirectory(path);
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}
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constexpr inline bool IsSubPath(const char* lhs, const char* rhs) {
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// Check pre-conditions
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ASSERT(lhs != nullptr);
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ASSERT(rhs != nullptr);
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// Import StringTraits names for current scope
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using namespace StringTraits;
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// Special case certain paths
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if (IsUncPath(lhs) && !IsUncPath(rhs)) {
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return false;
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}
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if (!IsUncPath(lhs) && IsUncPath(rhs)) {
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return false;
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}
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if (lhs[0] == DirectorySeparator && lhs[1] == NullTerminator && rhs[0] == DirectorySeparator &&
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rhs[1] != NullTerminator) {
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return true;
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}
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if (rhs[0] == DirectorySeparator && rhs[1] == NullTerminator && lhs[0] == DirectorySeparator &&
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lhs[1] != NullTerminator) {
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return true;
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}
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// Check subpath
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for (size_t i = 0; /* ... */; ++i) {
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if (lhs[i] == NullTerminator) {
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return rhs[i] == DirectorySeparator;
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} else if (rhs[i] == NullTerminator) {
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return lhs[i] == DirectorySeparator;
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} else if (lhs[i] != rhs[i]) {
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return false;
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}
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}
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}
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// Path utilities
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constexpr inline void Replace(char* dst, size_t dst_size, char old_char, char new_char) {
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ASSERT(dst != nullptr);
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for (char* cur = dst; cur < dst + dst_size && *cur; ++cur) {
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if (*cur == old_char) {
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*cur = new_char;
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}
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}
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}
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constexpr inline Result CheckUtf8(const char* s) {
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// Check pre-conditions
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ASSERT(s != nullptr);
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// Iterate, checking for utf8-validity
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while (*s) {
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char utf8_buf[4] = {};
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const auto pick_res = PickOutCharacterFromUtf8String(utf8_buf, std::addressof(s));
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R_UNLESS(pick_res == CharacterEncodingResult_Success, ResultInvalidPathFormat);
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u32 dummy;
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const auto cvt_res = ConvertCharacterUtf8ToUtf32(std::addressof(dummy), utf8_buf);
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R_UNLESS(cvt_res == CharacterEncodingResult_Success, ResultInvalidPathFormat);
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}
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R_SUCCEED();
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}
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// Path formatting
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class PathNormalizer {
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private:
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enum class PathState {
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Start,
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Normal,
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FirstSeparator,
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Separator,
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CurrentDir,
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ParentDir,
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};
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private:
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static constexpr void ReplaceParentDirectoryPath(char* dst, const char* src) {
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// Use StringTraits names for remainder of scope
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using namespace StringTraits;
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// Start with a dir-separator
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dst[0] = DirectorySeparator;
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auto i = 1;
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while (src[i] != NullTerminator) {
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if ((src[i - 1] == DirectorySeparator || src[i - 1] == AlternateDirectorySeparator) &&
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src[i + 0] == Dot && src[i + 1] == Dot &&
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(src[i + 2] == DirectorySeparator || src[i + 2] == AlternateDirectorySeparator)) {
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dst[i - 1] = DirectorySeparator;
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dst[i + 0] = Dot;
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dst[i + 1] = Dot;
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dst[i + 2] = DirectorySeparator;
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i += 3;
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} else {
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if (src[i - 1] == AlternateDirectorySeparator && src[i + 0] == Dot &&
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src[i + 1] == Dot && src[i + 2] == NullTerminator) {
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dst[i - 1] = DirectorySeparator;
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dst[i + 0] = Dot;
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dst[i + 1] = Dot;
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i += 2;
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break;
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}
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dst[i] = src[i];
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++i;
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}
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}
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dst[i] = StringTraits::NullTerminator;
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}
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public:
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static constexpr bool IsParentDirectoryPathReplacementNeeded(const char* path) {
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// Use StringTraits names for remainder of scope
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using namespace StringTraits;
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if (path[0] != DirectorySeparator && path[0] != AlternateDirectorySeparator) {
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return false;
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}
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// Check to find a parent reference using alternate separators
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if (path[0] != NullTerminator && path[1] != NullTerminator && path[2] != NullTerminator) {
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size_t i;
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for (i = 0; path[i + 3] != NullTerminator; ++path) {
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if (path[i + 1] != Dot || path[i + 2] != Dot) {
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continue;
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}
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const char c0 = path[i + 0];
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const char c3 = path[i + 3];
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if (c0 == AlternateDirectorySeparator &&
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(c3 == DirectorySeparator || c3 == AlternateDirectorySeparator ||
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c3 == NullTerminator)) {
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return true;
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}
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if (c3 == AlternateDirectorySeparator &&
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(c0 == DirectorySeparator || c0 == AlternateDirectorySeparator)) {
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return true;
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}
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}
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if (path[i + 0] == AlternateDirectorySeparator && path[i + 1] == Dot &&
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path[i + 2] == Dot /* && path[i + 3] == NullTerminator */) {
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return true;
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}
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}
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return false;
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}
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static constexpr Result IsNormalized(bool* out, size_t* out_len, const char* path,
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bool allow_all_characters = false) {
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// Use StringTraits names for remainder of scope
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using namespace StringTraits;
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// Parse the path
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auto state = PathState::Start;
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size_t len = 0;
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while (path[len] != NullTerminator) {
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// Get the current character
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const char c = path[len++];
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// Check the current character is valid
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if (!allow_all_characters && state != PathState::Start) {
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R_UNLESS(!IsInvalidCharacter(c), ResultInvalidCharacter);
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}
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// Process depending on current state
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switch (state) {
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// Import the PathState enums for convenience
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using enum PathState;
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case Start:
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R_UNLESS(c == DirectorySeparator, ResultInvalidPathFormat);
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state = FirstSeparator;
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break;
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case Normal:
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if (c == DirectorySeparator) {
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state = Separator;
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}
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break;
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case FirstSeparator:
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case Separator:
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if (c == DirectorySeparator) {
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*out = false;
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R_SUCCEED();
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}
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if (c == Dot) {
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state = CurrentDir;
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} else {
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state = Normal;
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}
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break;
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case CurrentDir:
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if (c == DirectorySeparator) {
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*out = false;
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R_SUCCEED();
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}
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if (c == Dot) {
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state = ParentDir;
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} else {
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state = Normal;
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}
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break;
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case ParentDir:
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if (c == DirectorySeparator) {
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*out = false;
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R_SUCCEED();
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}
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state = Normal;
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break;
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default:
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UNREACHABLE();
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break;
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}
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}
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// Check the final state
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switch (state) {
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// Import the PathState enums for convenience
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using enum PathState;
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case Start:
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R_THROW(ResultInvalidPathFormat);
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case Normal:
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case FirstSeparator:
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*out = true;
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break;
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case Separator:
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case CurrentDir:
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case ParentDir:
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*out = false;
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break;
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default:
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UNREACHABLE();
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break;
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}
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// Set the output length
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*out_len = len;
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R_SUCCEED();
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}
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static Result Normalize(char* dst, size_t* out_len, const char* path, size_t max_out_size,
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bool is_windows_path, bool is_drive_relative_path,
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bool allow_all_characters = false) {
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// Use StringTraits names for remainder of scope
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using namespace StringTraits;
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// Prepare to iterate
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const char* cur_path = path;
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size_t total_len = 0;
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// If path begins with a separator, check that we're not drive relative
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if (cur_path[0] != DirectorySeparator) {
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R_UNLESS(is_drive_relative_path, ResultInvalidPathFormat);
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dst[total_len++] = DirectorySeparator;
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}
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// We're going to need to do path replacement, potentially
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char* replacement_path = nullptr;
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size_t replacement_path_size = 0;
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SCOPE_EXIT {
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if (replacement_path != nullptr) {
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if (std::is_constant_evaluated()) {
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delete[] replacement_path;
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} else {
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Deallocate(replacement_path, replacement_path_size);
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}
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}
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};
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// Perform path replacement, if necessary
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if (IsParentDirectoryPathReplacementNeeded(cur_path)) {
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if (std::is_constant_evaluated()) {
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replacement_path_size = EntryNameLengthMax + 1;
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replacement_path = new char[replacement_path_size];
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} else {
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replacement_path_size = EntryNameLengthMax + 1;
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replacement_path = static_cast<char*>(Allocate(replacement_path_size));
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}
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ReplaceParentDirectoryPath(replacement_path, cur_path);
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cur_path = replacement_path;
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}
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// Iterate, normalizing path components
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bool skip_next_sep = false;
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size_t i = 0;
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while (cur_path[i] != NullTerminator) {
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// Process a directory separator, if we run into one
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if (cur_path[i] == DirectorySeparator) {
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// Swallow separators
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do {
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++i;
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} while (cur_path[i] == DirectorySeparator);
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// Check if we hit end of string
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if (cur_path[i] == NullTerminator) {
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break;
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}
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// If we aren't skipping the separator, write it, checking that we remain in bounds.
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if (!skip_next_sep) {
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if (total_len + 1 == max_out_size) {
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dst[total_len] = NullTerminator;
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*out_len = total_len;
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R_THROW(ResultTooLongPath);
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}
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dst[total_len++] = DirectorySeparator;
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}
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// Don't skip the next separator
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skip_next_sep = false;
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}
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// Get the length of the current directory component
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size_t dir_len = 0;
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while (cur_path[i + dir_len] != DirectorySeparator &&
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cur_path[i + dir_len] != NullTerminator) {
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// Check for validity
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if (!allow_all_characters) {
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R_UNLESS(!IsInvalidCharacter(cur_path[i + dir_len]), ResultInvalidCharacter);
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}
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++dir_len;
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}
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// Handle the current dir component
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if (IsCurrentDirectory(cur_path + i)) {
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skip_next_sep = true;
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} else if (IsParentDirectory(cur_path + i)) {
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// 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 constexpr 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
|