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// Copyright 2021 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include "common/fs/file.h"
#include "common/fs/fs.h"
#include "common/fs/path_util.h"
#include "common/logging/log.h"
#ifdef _WIN32
#include <io.h>
#include <share.h>
#else
#include <unistd.h>
#endif
#ifdef _MSC_VER
#define fileno _fileno
#define fseeko _fseeki64
#define ftello _ftelli64
#endif
namespace Common::FS {
namespace fs = std::filesystem;
namespace {
#ifdef _WIN32
/**
* Converts the file access mode and file type enums to a file access mode wide string.
*
* @param mode File access mode
* @param type File type
*
* @returns A pointer to a wide string representing the file access mode.
*/
[[nodiscard]] constexpr const wchar_t* AccessModeToWStr(FileAccessMode mode, FileType type) {
switch (type) {
case FileType::BinaryFile:
switch (mode) {
case FileAccessMode::Read:
return L"rb";
case FileAccessMode::Write:
return L"wb";
case FileAccessMode::Append:
return L"ab";
case FileAccessMode::ReadWrite:
return L"r+b";
case FileAccessMode::ReadAppend:
return L"a+b";
}
break;
case FileType::TextFile:
switch (mode) {
case FileAccessMode::Read:
return L"r";
case FileAccessMode::Write:
return L"w";
case FileAccessMode::Append:
return L"a";
case FileAccessMode::ReadWrite:
return L"r+";
case FileAccessMode::ReadAppend:
return L"a+";
}
break;
}
return L"";
}
/**
* Converts the file-share access flag enum to a Windows defined file-share access flag.
*
* @param flag File-share access flag
*
* @returns Windows defined file-share access flag.
*/
[[nodiscard]] constexpr int ToWindowsFileShareFlag(FileShareFlag flag) {
switch (flag) {
case FileShareFlag::ShareNone:
default:
return _SH_DENYRW;
case FileShareFlag::ShareReadOnly:
return _SH_DENYWR;
case FileShareFlag::ShareWriteOnly:
return _SH_DENYRD;
case FileShareFlag::ShareReadWrite:
return _SH_DENYNO;
}
}
#else
/**
* Converts the file access mode and file type enums to a file access mode string.
*
* @param mode File access mode
* @param type File type
*
* @returns A pointer to a string representing the file access mode.
*/
[[nodiscard]] constexpr const char* AccessModeToStr(FileAccessMode mode, FileType type) {
switch (type) {
case FileType::BinaryFile:
switch (mode) {
case FileAccessMode::Read:
return "rb";
case FileAccessMode::Write:
return "wb";
case FileAccessMode::Append:
return "ab";
case FileAccessMode::ReadWrite:
return "r+b";
case FileAccessMode::ReadAppend:
return "a+b";
}
break;
case FileType::TextFile:
switch (mode) {
case FileAccessMode::Read:
return "r";
case FileAccessMode::Write:
return "w";
case FileAccessMode::Append:
return "a";
case FileAccessMode::ReadWrite:
return "r+";
case FileAccessMode::ReadAppend:
return "a+";
}
break;
}
return "";
}
#endif
/**
* Converts the seek origin enum to a seek origin integer.
*
* @param origin Seek origin
*
* @returns Seek origin integer.
*/
[[nodiscard]] constexpr int ToSeekOrigin(SeekOrigin origin) {
switch (origin) {
case SeekOrigin::SetOrigin:
default:
return SEEK_SET;
case SeekOrigin::CurrentPosition:
return SEEK_CUR;
case SeekOrigin::End:
return SEEK_END;
}
}
} // Anonymous namespace
std::string ReadStringFromFile(const std::filesystem::path& path, FileType type) {
if (!IsFile(path)) {
return "";
}
IOFile io_file{path, FileAccessMode::Read, type};
return io_file.ReadString(io_file.GetSize());
}
size_t WriteStringToFile(const std::filesystem::path& path, FileType type,
std::string_view string) {
if (!IsFile(path)) {
return 0;
}
IOFile io_file{path, FileAccessMode::Write, type};
return io_file.WriteString(string);
}
size_t AppendStringToFile(const std::filesystem::path& path, FileType type,
std::string_view string) {
if (!IsFile(path)) {
return 0;
}
IOFile io_file{path, FileAccessMode::Append, type};
return io_file.WriteString(string);
}
IOFile::IOFile() = default;
IOFile::IOFile(const std::string& path, FileAccessMode mode, FileType type, FileShareFlag flag) {
Open(path, mode, type, flag);
}
IOFile::IOFile(std::string_view path, FileAccessMode mode, FileType type, FileShareFlag flag) {
Open(path, mode, type, flag);
}
IOFile::IOFile(const fs::path& path, FileAccessMode mode, FileType type, FileShareFlag flag) {
Open(path, mode, type, flag);
}
IOFile::~IOFile() {
Close();
}
IOFile::IOFile(IOFile&& other) noexcept {
std::swap(file_path, other.file_path);
std::swap(file_access_mode, other.file_access_mode);
std::swap(file_type, other.file_type);
std::swap(file, other.file);
}
IOFile& IOFile::operator=(IOFile&& other) noexcept {
std::swap(file_path, other.file_path);
std::swap(file_access_mode, other.file_access_mode);
std::swap(file_type, other.file_type);
std::swap(file, other.file);
return *this;
}
fs::path IOFile::GetPath() const {
return file_path;
}
FileAccessMode IOFile::GetAccessMode() const {
return file_access_mode;
}
FileType IOFile::GetType() const {
return file_type;
}
void IOFile::Open(const fs::path& path, FileAccessMode mode, FileType type, FileShareFlag flag) {
Close();
file_path = path;
file_access_mode = mode;
file_type = type;
errno = 0;
#ifdef _WIN32
if (flag != FileShareFlag::ShareNone) {
file = _wfsopen(path.c_str(), AccessModeToWStr(mode, type), ToWindowsFileShareFlag(flag));
} else {
_wfopen_s(&file, path.c_str(), AccessModeToWStr(mode, type));
}
#else
file = std::fopen(path.c_str(), AccessModeToStr(mode, type));
#endif
if (!IsOpen()) {
const auto ec = std::error_code{errno, std::generic_category()};
LOG_ERROR(Common_Filesystem, "Failed to open the file at path={}, ec_message={}",
PathToUTF8String(file_path), ec.message());
}
}
void IOFile::Close() {
if (!IsOpen()) {
return;
}
errno = 0;
const auto close_result = std::fclose(file) == 0;
if (!close_result) {
const auto ec = std::error_code{errno, std::generic_category()};
LOG_ERROR(Common_Filesystem, "Failed to close the file at path={}, ec_message={}",
PathToUTF8String(file_path), ec.message());
}
file = nullptr;
}
bool IOFile::IsOpen() const {
return file != nullptr;
}
std::string IOFile::ReadString(size_t length) const {
std::vector<char> string_buffer(length);
const auto chars_read = ReadSpan<char>(string_buffer);
const auto string_size = chars_read != length ? chars_read : length;
return std::string{string_buffer.data(), string_size};
}
size_t IOFile::WriteString(std::span<const char> string) const {
return WriteSpan(string);
}
bool IOFile::Flush() const {
if (!IsOpen()) {
return false;
}
errno = 0;
const auto flush_result = std::fflush(file) == 0;
if (!flush_result) {
const auto ec = std::error_code{errno, std::generic_category()};
LOG_ERROR(Common_Filesystem, "Failed to flush the file at path={}, ec_message={}",
PathToUTF8String(file_path), ec.message());
}
return flush_result;
}
bool IOFile::SetSize(u64 size) const {
if (!IsOpen()) {
return false;
}
errno = 0;
#ifdef _WIN32
const auto set_size_result = _chsize_s(fileno(file), static_cast<s64>(size)) == 0;
#else
const auto set_size_result = ftruncate(fileno(file), static_cast<s64>(size)) == 0;
#endif
if (!set_size_result) {
const auto ec = std::error_code{errno, std::generic_category()};
LOG_ERROR(Common_Filesystem, "Failed to resize the file at path={}, size={}, ec_message={}",
PathToUTF8String(file_path), size, ec.message());
}
return set_size_result;
}
u64 IOFile::GetSize() const {
if (!IsOpen()) {
return 0;
}
std::error_code ec;
const auto file_size = fs::file_size(file_path, ec);
if (ec) {
LOG_ERROR(Common_Filesystem, "Failed to retrieve the file size of path={}, ec_message={}",
PathToUTF8String(file_path), ec.message());
return 0;
}
return file_size;
}
bool IOFile::Seek(s64 offset, SeekOrigin origin) const {
if (!IsOpen()) {
return false;
}
errno = 0;
const auto seek_result = fseeko(file, offset, ToSeekOrigin(origin)) == 0;
if (!seek_result) {
const auto ec = std::error_code{errno, std::generic_category()};
LOG_ERROR(Common_Filesystem,
"Failed to seek the file at path={}, offset={}, origin={}, ec_message={}",
PathToUTF8String(file_path), offset, origin, ec.message());
}
return seek_result;
}
s64 IOFile::Tell() const {
if (!IsOpen()) {
return 0;
}
errno = 0;
return ftello(file);
}
} // namespace Common::FS
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