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Atmosphere/libraries/libstratosphere/include/stratosphere/fs/fs_path_utility.hpp

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/*
* Copyright (c) Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include <stratosphere/fs/fs_common.hpp>
#include <stratosphere/fssrv/sf/fssrv_sf_path.hpp>
namespace ams::fs {
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 ALWAYS_INLINE 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;
}
}
constexpr ALWAYS_INLINE bool IsInvalidCharacter(char c) { return impl::IsInvalidCharacterImpl<InvalidCharacters, util::size(InvalidCharacters)>(c); }
constexpr ALWAYS_INLINE bool IsInvalidCharacterForHostName(char c) { return impl::IsInvalidCharacterImpl<InvalidCharactersForHostName, util::size(InvalidCharactersForHostName)>(c); }
constexpr ALWAYS_INLINE bool IsInvalidCharacterForMountName(char c) { return impl::IsInvalidCharacterImpl<InvalidCharactersForMountName, util::size(InvalidCharactersForMountName)>(c); }
}
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 ALWAYS_INLINE PathFlags() : m_value(0) { /* ... */ }
#define DECLARE_PATH_FLAG_HANDLER(__WHICH__) \
constexpr ALWAYS_INLINE bool Is ## __WHICH__ ##Allowed() const { return (m_value & __WHICH__ ## Flag) != 0; } \
constexpr ALWAYS_INLINE 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) {
AMS_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) {
AMS_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) {
AMS_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. */
AMS_ASSERT(lhs != nullptr);
AMS_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) {
AMS_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. */
AMS_ASSERT(s != nullptr);
/* Iterate, checking for utf8-validity. */
while (*s) {
char utf8_buf[4] = {};
const auto pick_res = util::PickOutCharacterFromUtf8String(utf8_buf, std::addressof(s));
R_UNLESS(pick_res == util::CharacterEncodingResult_Success, fs::ResultInvalidPathFormat());
u32 dummy;
const auto cvt_res = util::ConvertCharacterUtf8ToUtf32(std::addressof(dummy), utf8_buf);
R_UNLESS(cvt_res == util::CharacterEncodingResult_Success, fs::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), fs::ResultInvalidCharacter());
}
/* Process depending on current state. */
switch (state) {
/* Import the PathState enums for convenience. */
using enum PathState;
case Start:
R_UNLESS(c == DirectorySeparator, fs::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;
AMS_UNREACHABLE_DEFAULT_CASE();
}
}
/* Check the final state. */
switch (state) {
/* Import the PathState enums for convenience. */
using enum PathState;
case Start:
R_THROW(fs::ResultInvalidPathFormat());
case Normal:
case FirstSeparator:
*out = true;
break;
case Separator:
case CurrentDir:
case ParentDir:
*out = false;
break;
AMS_UNREACHABLE_DEFAULT_CASE();
}
/* Set the output length. */
*out_len = len;
R_SUCCEED();
}
static constexpr 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, fs::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;
ON_SCOPE_EXIT {
if (replacement_path != nullptr) {
if (std::is_constant_evaluated()) {
delete[] replacement_path;
} else {
::ams::fs::impl::Deallocate(replacement_path, replacement_path_size);
}
}
};
/* Perform path replacement, if necessary. */
if (IsParentDirectoryPathReplacementNeeded(cur_path)) {
if (std::is_constant_evaluated()) {
replacement_path_size = fs::EntryNameLengthMax + 1;
replacement_path = new char[replacement_path_size];
} else {
replacement_path_size = fs::EntryNameLengthMax + 1;
replacement_path = static_cast<char *>(::ams::fs::impl::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(fs::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]), fs::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. */
AMS_ASSERT(dst[total_len - 1] == DirectorySeparator);
/* We should have started with a separator, for non-windows paths. */
if (!is_windows_path) {
AMS_ASSERT(dst[0] == DirectorySeparator);
}
/* Remove the previous component. */
if (total_len == 1) {
R_UNLESS(is_windows_path, fs::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) {
AMS_ASSERT(dst[total_len] == DirectorySeparator);
}
/* We should remain in bounds. */
AMS_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(fs::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, fs::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. */
AMS_ASSERT(is_normalized);
/* Set the output length. */
*out_len = total_len;
R_SUCCEED();
}
};
class PathFormatter {
private:
static constexpr ALWAYS_INLINE 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, fs::ResultInvalidPathFormat());
} else if (len == 2) {
R_UNLESS(name[0] != Dot || name[1] != Dot, fs::ResultInvalidPathFormat());
}
for (size_t i = 0; i < len; ++i) {
R_UNLESS(!IsInvalidCharacter(name[i]), fs::ResultInvalidCharacter());
}
R_SUCCEED();
}
static constexpr ALWAYS_INLINE 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, fs::ResultInvalidPathFormat());
}
for (size_t i = 0; i < len; ++i) {
R_UNLESS(!IsInvalidCharacterForHostName(name[i]), fs::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, fs::ResultInvalidCharacter());
}
}
R_SUCCEED();
}
public:
static constexpr ALWAYS_INLINE 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 ALWAYS_INLINE Result SkipMountName(const char **out, size_t *out_len, const char *path) {
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. */
AMS_ASSERT(path != nullptr);
AMS_ASSERT(out_len != nullptr);
AMS_ASSERT(out != nullptr);
AMS_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]), fs::ResultInvalidCharacter());
}
/* Copy out the mount name. */
if (out_mount_name_buffer_size > 0) {
R_UNLESS(mount_len < out_mount_name_buffer_size, fs::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 ALWAYS_INLINE Result SkipRelativeDotPath(const char **out, size_t *out_len, const char *path) {
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. */
AMS_ASSERT(path != nullptr);
AMS_ASSERT(out_len != nullptr);
AMS_ASSERT(out != nullptr);
AMS_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, fs::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), fs::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(fs::ResultNotNormalized) { *out_normalized = false; }
} R_END_TRY_CATCH;
ON_RESULT_INCLUDED(fs::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. */
AMS_ASSERT(path != nullptr);
AMS_ASSERT(out_len != nullptr);
AMS_ASSERT(out != nullptr);
AMS_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, fs::ResultNotNormalized());
++cur_path;
} else if (IsWindowsDrive(path + 1)) {
R_UNLESS(out_win_buffer_size > 0, fs::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]), fs::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, fs::ResultNotNormalized());
}
} else {
/* Ensure we can copy into the normalized buffer. */
R_UNLESS(win_path_len < out_win_buffer_size, fs::ResultTooLongPath());
for (size_t i = 0; i < win_path_len; ++i) {
out_win[i] = cur_path[i];
}
out_win[win_path_len] = NullTerminator;
fs::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, fs::ResultTooLongPath());
for (size_t i = 0; i < dos_prefix_len; ++i) {
out_win[i] = cur_path[i];
}
out_win[dos_prefix_len] = NullTerminator;
fs::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, fs::ResultInvalidPathFormat());
R_UNLESS(cur_path[UncPathPrefixLength] != AlternateDirectorySeparator, fs::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, fs::ResultInvalidPathFormat());
R_UNLESS(cur_path[pos + 1] != AlternateDirectorySeparator, fs::ResultInvalidPathFormat());
R_TRY(CheckHostName(cur_path + 2, pos - 2));
cur_component_offset = pos + 1;
}
}
R_UNLESS(cur_component_offset != pos, fs::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, fs::ResultNotNormalized());
}
} else {
/* Ensure we can copy into the normalized buffer. */
R_UNLESS(unc_prefix_len < out_win_buffer_size, fs::ResultTooLongPath());
for (size_t i = 0; i < unc_prefix_len; ++i) {
out_win[i] = cur_path[i];
}
out_win[unc_prefix_len] = NullTerminator;
fs::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, fs::ResultNullptrArgument());
R_UNLESS(out_len != nullptr, fs::ResultNullptrArgument());
R_UNLESS(path != nullptr, fs::ResultNullptrArgument());
/* Verify that the path is valid utf-8. */
R_TRY(fs::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(), fs::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(), fs::ResultInvalidPathFormat());
}
/* Check that the path is allowed to be a windows path, if it is. */
if (fs::IsWindowsPath(path, false)) {
R_UNLESS(flags.IsWindowsPathAllowed(), fs::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(), fs::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(), fs::ResultInvalidPathFormat());
R_UNLESS(!IsInvalidCharacter(path[0]), fs::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(), fs::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(), fs::ResultInvalidPathFormat());
*out = false;
R_SUCCEED();
}
/* If we had a windows path, check that was allowed. */
if (windows_len > 0) {
R_UNLESS(flags.IsWindowsPathAllowed(), fs::ResultInvalidPathFormat());
total_len += windows_len;
/* We can't have both a relative path and a windows path. */
R_UNLESS(relative_len == 0, fs::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(), fs::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(), fs::ResultInvalidPathFormat());
R_UNLESS(!IsInvalidCharacter(src[0]), fs::ResultInvalidPathFormat());
dst[cur_pos++] = Dot;
is_drive_relative = true;
}
size_t relative_len = 0;
if (flags.IsRelativePathAllowed()) {
R_UNLESS(cur_pos < dst_size, fs::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, fs::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, fs::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, fs::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;
ON_SCOPE_EXIT {
if (replaced_src != nullptr) {
if (std::is_constant_evaluated()) {
delete[] replaced_src;
} else {
::ams::fs::impl::Deallocate(replaced_src, replaced_src_len);
}
}
};
if (std::is_constant_evaluated()) {
replaced_src = new char[replaced_src_len];
} else {
replaced_src = static_cast<char *>(::ams::fs::impl::Allocate(replaced_src_len));
}
util::Strlcpy<char>(replaced_src, src, replaced_src_len);
fs::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();
}
};
inline Result ConvertToFspPath(fssrv::sf::FspPath *out, const char *src) {
/* Check pre-conditions. */
AMS_ASSERT(out != nullptr);
AMS_ASSERT(src != nullptr);
/* Copy the path. */
const size_t len = util::Strlcpy<char>(out->str, src, sizeof(out->str));
R_UNLESS(len < sizeof(out->str), fs::ResultTooLongPath());
/* Skip mount name. */
const char *path_split_mount_name;
size_t skip_len;
R_TRY(PathFormatter::SkipMountName(std::addressof(path_split_mount_name), std::addressof(skip_len), src));
/* Perform further validation. */
if (fs::IsWindowsPath(path_split_mount_name, true)) {
if ((skip_len == 0 || !util::Strncmp<char>(src, AMS_FS_IMPL_HOST_ROOT_FILE_SYSTEM_MOUNT_NAME ":", AMS_FS_IMPL_HOST_ROOT_FILE_SYSTEM_MOUNT_NAME_LEN + 1)) && fs::IsUncPath(out->str + skip_len, true, false)) {
out->str[skip_len + 0] = '\\';
out->str[skip_len + 1] = '\\';
}
} else {
fs::Replace(out->str, sizeof(out->str) - 1, '\\', '/');
}
R_SUCCEED();
}
Result FormatToFspPath(fssrv::sf::FspPath *out, const char *fmt, ...) __attribute__((format(printf, 2, 3)));
inline Result FormatToFspPath(fssrv::sf::FspPath *out, const char *fmt, ...) {
/* Check pre-conditions. */
AMS_ASSERT(out != nullptr);
AMS_ASSERT(fmt != nullptr);
/* Format the path. */
std::va_list vl;
va_start(vl, fmt);
const size_t len = util::VSNPrintf(out->str, sizeof(out->str), fmt, vl);
va_end(vl);
R_UNLESS(len < sizeof(out->str), fs::ResultTooLongPath());
/* Skip mount name. */
const char *path_split_mount_name;
size_t skip_len;
R_TRY(PathFormatter::SkipMountName(std::addressof(path_split_mount_name), std::addressof(skip_len), out->str));
/* Perform further validation. */
if (fs::IsWindowsPath(path_split_mount_name, true)) {
if ((skip_len == 0 || !util::Strncmp<char>(out->str, AMS_FS_IMPL_HOST_ROOT_FILE_SYSTEM_MOUNT_NAME ":", AMS_FS_IMPL_HOST_ROOT_FILE_SYSTEM_MOUNT_NAME_LEN + 1)) && fs::IsUncPath(out->str + skip_len, true, false)) {
out->str[skip_len + 0] = '\\';
out->str[skip_len + 1] = '\\';
}
} else {
fs::Replace(out->str, sizeof(out->str) - 1, '\\', '/');
}
R_SUCCEED();
}
}
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