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/*
* Copyright (C) 2007-2017 Apple Inc. All rights reserved.
* Copyright (C) 2015 Canon Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include <wtf/FileSystem.h>
#include <wtf/CryptographicallyRandomNumber.h>
#include <wtf/HexNumber.h>
#include <wtf/Scope.h>
#include <wtf/text/CString.h>
#include <wtf/text/StringBuilder.h>
#if !OS(WINDOWS)
#include <sys/mman.h>
#include <sys/param.h>
#include <sys/stat.h>
#endif
#if USE(GLIB)
#include <gio/gfiledescriptorbased.h>
#include <gio/gio.h>
#endif
#if HAVE(STD_FILESYSTEM) || HAVE(STD_EXPERIMENTAL_FILESYSTEM)
#include <wtf/StdFilesystem.h>
#endif
namespace WTF::FileSystemImpl {
#if HAVE(STD_FILESYSTEM) || HAVE(STD_EXPERIMENTAL_FILESYSTEM)
static std::filesystem::path toStdFileSystemPath(StringView path)
{
#if HAVE(MISSING_STD_FILESYSTEM_PATH_CONSTRUCTOR)
ALLOW_DEPRECATED_DECLARATIONS_BEGIN
return std::filesystem::u8path(path.utf8().data());
ALLOW_DEPRECATED_DECLARATIONS_END
#else
return { std::u8string(reinterpret_cast<const char8_t*>(path.utf8().data())) };
#endif
}
static String fromStdFileSystemPath(const std::filesystem::path& path)
{
return String::fromUTF8(reinterpret_cast<const LChar*>(path.u8string().c_str()));
}
#endif // HAVE(STD_FILESYSTEM) || HAVE(STD_EXPERIMENTAL_FILESYSTEM)
// The following lower-ASCII characters need escaping to be used in a filename
// across all systems, including Windows:
// - Unprintable ASCII (00-1F)
// - Space (20)
// - Double quote (22)
// - Percent (25) (escaped because it is our escape character)
// - Asterisk (2A)
// - Slash (2F)
// - Colon (3A)
// - Less-than (3C)
// - Greater-than (3E)
// - Question Mark (3F)
// - Backslash (5C)
// - Pipe (7C)
// - Delete (7F)
static const bool needsEscaping[128] = {
true, true, true, true, true, true, true, true, /* 00-07 */
true, true, true, true, true, true, true, true, /* 08-0F */
true, true, true, true, true, true, true, true, /* 10-17 */
true, true, true, true, true, true, true, true, /* 18-1F */
true, false, true, false, false, true, false, false, /* 20-27 */
false, false, true, false, false, false, false, true, /* 28-2F */
false, false, false, false, false, false, false, false, /* 30-37 */
false, false, true, false, true, false, true, true, /* 38-3F */
false, false, false, false, false, false, false, false, /* 40-47 */
false, false, false, false, false, false, false, false, /* 48-4F */
false, false, false, false, false, false, false, false, /* 50-57 */
false, false, false, false, true, false, false, false, /* 58-5F */
false, false, false, false, false, false, false, false, /* 60-67 */
false, false, false, false, false, false, false, false, /* 68-6F */
false, false, false, false, false, false, false, false, /* 70-77 */
false, false, false, false, true, false, false, true, /* 78-7F */
};
static inline bool shouldEscapeUChar(UChar character, UChar previousCharacter, UChar nextCharacter)
{
if (character <= 127)
return needsEscaping[character];
if (U16_IS_LEAD(character) && !U16_IS_TRAIL(nextCharacter))
return true;
if (U16_IS_TRAIL(character) && !U16_IS_LEAD(previousCharacter))
return true;
return false;
}
#if HAVE(STD_FILESYSTEM) || HAVE(STD_EXPERIMENTAL_FILESYSTEM)
template<typename ClockType, typename = void> struct has_to_time_t : std::false_type { };
template<typename ClockType> struct has_to_time_t<ClockType, std::void_t<
std::enable_if_t<std::is_same_v<std::time_t, decltype(ClockType::to_time_t(std::filesystem::file_time_type()))>>
>> : std::true_type { };
template <typename FileTimeType>
typename std::enable_if_t<has_to_time_t<typename FileTimeType::clock>::value, std::time_t> toTimeT(FileTimeType fileTime)
{
return decltype(fileTime)::clock::to_time_t(fileTime);
}
template <typename FileTimeType>
typename std::enable_if_t<!has_to_time_t<typename FileTimeType::clock>::value, std::time_t> toTimeT(FileTimeType fileTime)
{
return std::chrono::system_clock::to_time_t(std::chrono::time_point_cast<std::chrono::system_clock::duration>(fileTime - decltype(fileTime)::clock::now() + std::chrono::system_clock::now()));
}
static WallTime toWallTime(std::filesystem::file_time_type fileTime)
{
// FIXME: Use std::chrono::file_clock::to_sys() once we can use C++20.
return WallTime::fromRawSeconds(toTimeT(fileTime));
}
#endif // HAVE(STD_FILESYSTEM) || HAVE(STD_EXPERIMENTAL_FILESYSTEM)
String encodeForFileName(const String& inputString)
{
unsigned length = inputString.length();
if (!length)
return inputString;
StringBuilder result;
result.reserveCapacity(length);
UChar previousCharacter = 0;
UChar nextCharacter = inputString[0];
for (unsigned i = 0; i < length; ++i) {
auto character = std::exchange(nextCharacter, i + 1 < length ? inputString[i + 1] : 0);
if (shouldEscapeUChar(character, previousCharacter, nextCharacter)) {
if (character <= 0xFF)
result.append('%', hex(character, 2));
else
result.append("%+", hex(static_cast<uint8_t>(character >> 8), 2), hex(static_cast<uint8_t>(character), 2));
} else
result.append(character);
previousCharacter = character;
}
return result.toString();
}
String decodeFromFilename(const String& inputString)
{
unsigned length = inputString.length();
if (!length)
return inputString;
StringBuilder result;
result.reserveCapacity(length);
for (unsigned i = 0; i < length; ++i) {
if (inputString[i] != '%') {
result.append(inputString[i]);
continue;
}
// If the input string is a valid encoded filename, it must be at least 2 characters longer
// than the current index to account for this percent encoded value.
if (i + 2 >= length)
return { };
if (inputString[i+1] != '+') {
if (!isASCIIHexDigit(inputString[i + 1]))
return { };
if (!isASCIIHexDigit(inputString[i + 2]))
return { };
result.append(toASCIIHexValue(inputString[i + 1], inputString[i + 2]));
i += 2;
continue;
}
// If the input string is a valid encoded filename, it must be at least 5 characters longer
// than the current index to account for this percent encoded value.
if (i + 5 >= length)
return { };
if (!isASCIIHexDigit(inputString[i + 2]))
return { };
if (!isASCIIHexDigit(inputString[i + 3]))
return { };
if (!isASCIIHexDigit(inputString[i + 4]))
return { };
if (!isASCIIHexDigit(inputString[i + 5]))
return { };
UChar encodedCharacter = toASCIIHexValue(inputString[i + 2], inputString[i + 3]) << 8 | toASCIIHexValue(inputString[i + 4], inputString[i + 5]);
result.append(encodedCharacter);
i += 5;
}
return result.toString();
}
String lastComponentOfPathIgnoringTrailingSlash(const String& path)
{
#if OS(WINDOWS)
char pathSeparator = '\\';
#else
char pathSeparator = '/';
#endif
auto position = path.reverseFind(pathSeparator);
if (position == notFound)
return path;
size_t endOfSubstring = path.length() - 1;
if (position == endOfSubstring) {
--endOfSubstring;
position = path.reverseFind(pathSeparator, endOfSubstring);
}
return path.substring(position + 1, endOfSubstring - position);
}
bool appendFileContentsToFileHandle(const String& path, PlatformFileHandle& target)
{
auto source = openFile(path, FileOpenMode::Read);
if (!isHandleValid(source))
return false;
static int bufferSize = 1 << 19;
Vector<uint8_t> buffer(bufferSize);
auto fileCloser = WTF::makeScopeExit([source]() {
PlatformFileHandle handle = source;
closeFile(handle);
});
do {
int readBytes = readFromFile(source, buffer.data(), bufferSize);
if (readBytes < 0)
return false;
if (writeToFile(target, buffer.data(), readBytes) != readBytes)
return false;
if (readBytes < bufferSize)
return true;
} while (true);
ASSERT_NOT_REACHED();
}
bool filesHaveSameVolume(const String& fileA, const String& fileB)
{
auto fsRepFileA = fileSystemRepresentation(fileA);
auto fsRepFileB = fileSystemRepresentation(fileB);
if (fsRepFileA.isNull() || fsRepFileB.isNull())
return false;
bool result = false;
auto fileADev = getFileDeviceId(fsRepFileA);
auto fileBDev = getFileDeviceId(fsRepFileB);
if (fileADev && fileBDev)
result = (fileADev == fileBDev);
return result;
}
#if !PLATFORM(MAC)
void setMetadataURL(const String&, const String&, const String&)
{
}
#endif
MappedFileData::MappedFileData(const String& filePath, MappedFileMode mapMode, bool& success)
{
auto fd = openFile(filePath, FileSystem::FileOpenMode::Read);
success = mapFileHandle(fd, FileSystem::FileOpenMode::Read, mapMode);
closeFile(fd);
}
#if HAVE(MMAP)
MappedFileData::~MappedFileData()
{
if (!m_fileData)
return;
munmap(m_fileData, m_fileSize);
}
bool MappedFileData::mapFileHandle(PlatformFileHandle handle, FileOpenMode openMode, MappedFileMode mapMode)
{
if (!isHandleValid(handle))
return false;
int fd;
#if USE(GLIB)
auto* inputStream = g_io_stream_get_input_stream(G_IO_STREAM(handle));
fd = g_file_descriptor_based_get_fd(G_FILE_DESCRIPTOR_BASED(inputStream));
#else
fd = handle;
#endif
struct stat fileStat;
if (fstat(fd, &fileStat)) {
return false;
}
unsigned size;
if (!WTF::convertSafely(fileStat.st_size, size)) {
return false;
}
if (!size)
return true;
int pageProtection = PROT_READ;
switch (openMode) {
case FileOpenMode::Read:
pageProtection = PROT_READ;
break;
case FileOpenMode::Write:
pageProtection = PROT_WRITE;
break;
case FileOpenMode::ReadWrite:
pageProtection = PROT_READ | PROT_WRITE;
break;
#if OS(DARWIN)
case FileOpenMode::EventsOnly:
ASSERT_NOT_REACHED();
#endif
}
void* data = mmap(0, size, pageProtection, MAP_FILE | (mapMode == MappedFileMode::Shared ? MAP_SHARED : MAP_PRIVATE), fd, 0);
if (data == MAP_FAILED) {
return false;
}
m_fileData = data;
m_fileSize = size;
return true;
}
#endif
PlatformFileHandle openAndLockFile(const String& path, FileOpenMode openMode, OptionSet<FileLockMode> lockMode)
{
auto handle = openFile(path, openMode);
if (handle == invalidPlatformFileHandle)
return invalidPlatformFileHandle;
#if USE(FILE_LOCK)
bool locked = lockFile(handle, lockMode);
ASSERT_UNUSED(locked, locked);
#else
UNUSED_PARAM(lockMode);
#endif
return handle;
}
void unlockAndCloseFile(PlatformFileHandle handle)
{
#if USE(FILE_LOCK)
bool unlocked = unlockFile(handle);
ASSERT_UNUSED(unlocked, unlocked);
#endif
closeFile(handle);
}
#if !PLATFORM(IOS_FAMILY)
bool isSafeToUseMemoryMapForPath(const String&)
{
return true;
}
void makeSafeToUseMemoryMapForPath(const String&)
{
}
#endif
#if !PLATFORM(COCOA)
String createTemporaryZipArchive(const String&)
{
return { };
}
bool excludeFromBackup(const String&)
{
return false;
}
#endif
MappedFileData mapToFile(const String& path, size_t bytesSize, Function<void(const Function<bool(Span<const uint8_t>)>&)>&& apply, PlatformFileHandle* outputHandle)
{
constexpr bool failIfFileExists = true;
auto handle = FileSystem::openFile(path, FileSystem::FileOpenMode::ReadWrite, FileSystem::FileAccessPermission::User, failIfFileExists);
if (!FileSystem::isHandleValid(handle) || !FileSystem::truncateFile(handle, bytesSize)) {
FileSystem::closeFile(handle);
return { };
}
FileSystem::makeSafeToUseMemoryMapForPath(path);
bool success;
FileSystem::MappedFileData mappedFile(handle, FileSystem::FileOpenMode::ReadWrite, FileSystem::MappedFileMode::Shared, success);
if (!success) {
FileSystem::closeFile(handle);
return { };
}
void* map = const_cast<void*>(mappedFile.data());
uint8_t* mapData = static_cast<uint8_t*>(map);
apply([&mapData](Span<const uint8_t> chunk) {
memcpy(mapData, chunk.data(), chunk.size());
mapData += chunk.size();
return true;
});
#if OS(WINDOWS)
DWORD oldProtection;
VirtualProtect(map, bytesSize, FILE_MAP_READ, &oldProtection);
FlushViewOfFile(map, bytesSize);
#else
// Drop the write permission.
mprotect(map, bytesSize, PROT_READ);
// Flush (asynchronously) to file, turning this into clean memory.
msync(map, bytesSize, MS_ASYNC);
#endif
if (outputHandle)
*outputHandle = handle;
else
FileSystem::closeFile(handle);
return mappedFile;
}
static Salt makeSalt()
{
Salt salt;
static_assert(salt.size() == 8, "Salt size");
*reinterpret_cast_ptr<uint32_t*>(&salt[0]) = cryptographicallyRandomNumber();
*reinterpret_cast_ptr<uint32_t*>(&salt[4]) = cryptographicallyRandomNumber();
return salt;
}
std::optional<Salt> readOrMakeSalt(const String& path)
{
if (FileSystem::fileExists(path)) {
auto file = FileSystem::openFile(path, FileSystem::FileOpenMode::Read);
Salt salt;
auto bytesRead = static_cast<std::size_t>(FileSystem::readFromFile(file, salt.data(), salt.size()));
FileSystem::closeFile(file);
if (bytesRead == salt.size())
return salt;
FileSystem::deleteFile(path);
}
Salt salt = makeSalt();
FileSystem::makeAllDirectories(FileSystem::parentPath(path));
auto file = FileSystem::openFile(path, FileSystem::FileOpenMode::Write, FileSystem::FileAccessPermission::User);
if (!FileSystem::isHandleValid(file))
return { };
bool success = static_cast<std::size_t>(FileSystem::writeToFile(file, salt.data(), salt.size())) == salt.size();
FileSystem::closeFile(file);
if (!success)
return { };
return salt;
}
std::optional<Vector<uint8_t>> readEntireFile(PlatformFileHandle handle)
{
if (!FileSystem::isHandleValid(handle))
return std::nullopt;
auto size = FileSystem::fileSize(handle).value_or(0);
if (!size)
return std::nullopt;
size_t bytesToRead;
if (!WTF::convertSafely(size, bytesToRead))
return std::nullopt;
Vector<uint8_t> buffer(bytesToRead);
size_t totalBytesRead = 0;
int bytesRead;
while ((bytesRead = FileSystem::readFromFile(handle, buffer.data() + totalBytesRead, bytesToRead - totalBytesRead)) > 0)
totalBytesRead += bytesRead;
if (totalBytesRead != bytesToRead)
return std::nullopt;
return buffer;
}
std::optional<Vector<uint8_t>> readEntireFile(const String& path)
{
auto handle = FileSystem::openFile(path, FileSystem::FileOpenMode::Read);
auto contents = readEntireFile(handle);
FileSystem::closeFile(handle);
return contents;
}
void deleteAllFilesModifiedSince(const String& directory, WallTime time)
{
// This function may delete directory folder.
if (time == -WallTime::infinity()) {
deleteNonEmptyDirectory(directory);
return;
}
auto children = listDirectory(directory);
for (auto& child : children) {
auto childPath = FileSystem::pathByAppendingComponent(directory, child);
auto childType = fileType(childPath);
if (!childType)
continue;
switch (*childType) {
case FileType::Regular: {
if (auto modificationTime = FileSystem::fileModificationTime(childPath); modificationTime && *modificationTime >= time)
deleteFile(childPath);
break;
}
case FileType::Directory:
deleteAllFilesModifiedSince(childPath, time);
deleteEmptyDirectory(childPath);
break;
case FileType::SymbolicLink:
break;
}
}
FileSystem::deleteEmptyDirectory(directory);
}
#if HAVE(STD_FILESYSTEM) || HAVE(STD_EXPERIMENTAL_FILESYSTEM)
bool deleteEmptyDirectory(const String& path)
{
std::error_code ec;
auto fsPath = toStdFileSystemPath(path);
auto fileStatus = std::filesystem::symlink_status(fsPath, ec);
if (ec || fileStatus.type() != std::filesystem::file_type::directory)
return false;
#if PLATFORM(MAC)
bool containsSingleDSStoreFile = false;
auto entries = std::filesystem::directory_iterator(fsPath, ec);
for (auto it = std::filesystem::begin(entries), end = std::filesystem::end(entries); !ec && it != end; it.increment(ec)) {
if (it->path().filename() == ".DS_Store")
containsSingleDSStoreFile = true;
else {
containsSingleDSStoreFile = false;
break;
}
}
if (containsSingleDSStoreFile)
std::filesystem::remove(fsPath / ".DS_Store", ec);
#endif
// remove() returns false on error so no need to check ec.
return std::filesystem::remove(fsPath, ec);
}
#if !PLATFORM(PLAYSTATION)
bool moveFile(const String& oldPath, const String& newPath)
{
auto fsOldPath = toStdFileSystemPath(oldPath);
auto fsNewPath = toStdFileSystemPath(newPath);
std::error_code ec;
std::filesystem::rename(fsOldPath, fsNewPath, ec);
if (!ec)
return true;
// Fall back to copying and then deleting source as rename() does not work across volumes.
ec = { };
std::filesystem::copy(fsOldPath, fsNewPath, std::filesystem::copy_options::overwrite_existing | std::filesystem::copy_options::recursive, ec);
if (ec)
return false;
return std::filesystem::remove_all(fsOldPath, ec);
}
#endif
std::optional<uint64_t> fileSize(const String& path)
{
std::error_code ec;
auto size = std::filesystem::file_size(toStdFileSystemPath(path), ec);
if (ec)
return std::nullopt;
return size;
}
#if !PLATFORM(PLAYSTATION)
std::optional<uint64_t> volumeFreeSpace(const String& path)
{
std::error_code ec;
auto spaceInfo = std::filesystem::space(toStdFileSystemPath(path), ec);
if (ec)
return std::nullopt;
return spaceInfo.available;
}
#endif
bool createSymbolicLink(const String& targetPath, const String& symbolicLinkPath)
{
std::error_code ec;
std::filesystem::create_symlink(toStdFileSystemPath(targetPath), toStdFileSystemPath(symbolicLinkPath), ec);
return !ec;
}
bool hardLink(const String& targetPath, const String& linkPath)
{
std::error_code ec;
std::filesystem::create_hard_link(toStdFileSystemPath(targetPath), toStdFileSystemPath(linkPath), ec);
return !ec;
}
bool hardLinkOrCopyFile(const String& targetPath, const String& linkPath)
{
auto fsTargetPath = toStdFileSystemPath(targetPath);
auto fsLinkPath = toStdFileSystemPath(linkPath);
std::error_code ec;
std::filesystem::create_hard_link(fsTargetPath, fsLinkPath, ec);
if (!ec)
return true;
std::filesystem::copy_file(fsTargetPath, fsLinkPath, ec);
return !ec;
}
std::optional<uint64_t> hardLinkCount(const String& path)
{
std::error_code ec;
uint64_t linkCount = std::filesystem::hard_link_count(toStdFileSystemPath(path), ec);
return ec ? std::nullopt : std::make_optional(linkCount);
}
#if !PLATFORM(PLAYSTATION)
bool deleteNonEmptyDirectory(const String& path)
{
std::error_code ec;
std::filesystem::remove_all(toStdFileSystemPath(path), ec);
return !ec;
}
#endif
std::optional<WallTime> fileModificationTime(const String& path)
{
std::error_code ec;
auto modificationTime = std::filesystem::last_write_time(toStdFileSystemPath(path), ec);
if (ec)
return std::nullopt;
return toWallTime(modificationTime);
}
bool updateFileModificationTime(const String& path)
{
std::error_code ec;
std::filesystem::last_write_time(toStdFileSystemPath(path), std::filesystem::file_time_type::clock::now(), ec);
return !ec;
}
bool isHiddenFile(const String& path)
{
#if OS(UNIX)
auto fsPath = toStdFileSystemPath(path);
std::filesystem::path::string_type filename = fsPath.filename();
return !filename.empty() && filename[0] == '.';
#else
UNUSED_PARAM(path);
return false;
#endif
}
enum class ShouldFollowSymbolicLinks { No, Yes };
static std::optional<FileType> fileTypePotentiallyFollowingSymLinks(const String& path, ShouldFollowSymbolicLinks shouldFollowSymbolicLinks)
{
std::error_code ec;
auto status = shouldFollowSymbolicLinks == ShouldFollowSymbolicLinks::Yes ? std::filesystem::status(toStdFileSystemPath(path), ec) : std::filesystem::symlink_status(toStdFileSystemPath(path), ec);
if (ec)
return std::nullopt;
switch (status.type()) {
case std::filesystem::file_type::directory:
return FileType::Directory;
case std::filesystem::file_type::symlink:
return FileType::SymbolicLink;
default:
break;
}
return FileType::Regular;
}
std::optional<FileType> fileType(const String& path)
{
return fileTypePotentiallyFollowingSymLinks(path, ShouldFollowSymbolicLinks::No);
}
std::optional<FileType> fileTypeFollowingSymlinks(const String& path)
{
return fileTypePotentiallyFollowingSymLinks(path, ShouldFollowSymbolicLinks::Yes);
}
String pathFileName(const String& path)
{
return fromStdFileSystemPath(toStdFileSystemPath(path).filename());
}
String parentPath(const String& path)
{
return fromStdFileSystemPath(toStdFileSystemPath(path).parent_path());
}
#if !PLATFORM(PLAYSTATION)
String realPath(const String& path)
{
std::error_code ec;
auto canonicalPath = std::filesystem::canonical(toStdFileSystemPath(path), ec);
return ec ? path : fromStdFileSystemPath(canonicalPath);
}
#endif
#if !PLATFORM(PLAYSTATION)
Vector<String> listDirectory(const String& path)
{
Vector<String> fileNames;
std::error_code ec;
auto entries = std::filesystem::directory_iterator(toStdFileSystemPath(path), ec);
for (auto it = std::filesystem::begin(entries), end = std::filesystem::end(entries); !ec && it != end; it.increment(ec)) {
auto fileName = fromStdFileSystemPath(it->path().filename());
if (!fileName.isNull())
fileNames.append(WTFMove(fileName));
}
return fileNames;
}
#endif
#if !ENABLE(FILESYSTEM_POSIX_FAST_PATH)
bool fileExists(const String& path)
{
std::error_code ec;
// exists() returns false on error so no need to check ec.
return std::filesystem::exists(toStdFileSystemPath(path), ec);
}
bool deleteFile(const String& path)
{
std::error_code ec;
auto fsPath = toStdFileSystemPath(path);
auto fileStatus = std::filesystem::symlink_status(fsPath, ec);
if (ec || fileStatus.type() == std::filesystem::file_type::directory)
return false;
// remove() returns false on error so no need to check ec.
return std::filesystem::remove(fsPath, ec);
}
bool makeAllDirectories(const String& path)
{
std::error_code ec;
std::filesystem::create_directories(toStdFileSystemPath(path), ec);
return !ec;
}
String pathByAppendingComponent(const String& path, const String& component)
{
return fromStdFileSystemPath(toStdFileSystemPath(path) / toStdFileSystemPath(component));
}
String pathByAppendingComponents(StringView path, const Vector<StringView>& components)
{
auto fsPath = toStdFileSystemPath(path);
for (auto& component : components)
fsPath /= toStdFileSystemPath(component);
return fromStdFileSystemPath(fsPath);
}
#endif
#endif // HAVE(STD_FILESYSTEM) || HAVE(STD_EXPERIMENTAL_FILESYSTEM)
} // namespace WTF::FileSystemImpl