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// Copyright 2018 yuzu emulator team
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <cstring>
#include <memory>
#include "common/common_types.h"
#include "common/logging/log.h"
#include "core/file_sys/disk_filesystem.h"
#include "core/file_sys/errors.h"
namespace FileSys {
static std::string ModeFlagsToString(Mode mode) {
std::string mode_str;
u32 mode_flags = static_cast<u32>(mode);
// Calculate the correct open mode for the file.
if ((mode_flags & static_cast<u32>(Mode::Read)) &&
(mode_flags & static_cast<u32>(Mode::Write))) {
if (mode_flags & static_cast<u32>(Mode::Append))
mode_str = "a+";
else
mode_str = "r+";
} else {
if (mode_flags & static_cast<u32>(Mode::Read))
mode_str = "r";
else if (mode_flags & static_cast<u32>(Mode::Append))
mode_str = "a";
else if (mode_flags & static_cast<u32>(Mode::Write))
mode_str = "w";
}
mode_str += "b";
return mode_str;
}
std::string Disk_FileSystem::GetName() const {
return "Disk";
}
ResultVal<std::unique_ptr<StorageBackend>> Disk_FileSystem::OpenFile(const std::string& path,
Mode mode) const {
// Calculate the correct open mode for the file.
std::string mode_str = ModeFlagsToString(mode);
std::string full_path = base_directory + path;
auto file = std::make_shared<FileUtil::IOFile>(full_path, mode_str.c_str());
if (!file->IsOpen()) {
return ERROR_PATH_NOT_FOUND;
}
return MakeResult<std::unique_ptr<StorageBackend>>(
std::make_unique<Disk_Storage>(std::move(file)));
}
ResultCode Disk_FileSystem::DeleteFile(const std::string& path) const {
if (!FileUtil::Exists(path)) {
return ERROR_PATH_NOT_FOUND;
}
FileUtil::Delete(path);
return RESULT_SUCCESS;
}
ResultCode Disk_FileSystem::RenameFile(const Path& src_path, const Path& dest_path) const {
LOG_WARNING(Service_FS, "(STUBBED) called");
// TODO(wwylele): Use correct error code
return ResultCode(-1);
}
ResultCode Disk_FileSystem::DeleteDirectory(const Path& path) const {
LOG_WARNING(Service_FS, "(STUBBED) called");
// TODO(wwylele): Use correct error code
return ResultCode(-1);
}
ResultCode Disk_FileSystem::DeleteDirectoryRecursively(const Path& path) const {
LOG_WARNING(Service_FS, "(STUBBED) called");
// TODO(wwylele): Use correct error code
return ResultCode(-1);
}
ResultCode Disk_FileSystem::CreateFile(const std::string& path, u64 size) const {
LOG_WARNING(Service_FS, "(STUBBED) called");
std::string full_path = base_directory + path;
if (size == 0) {
FileUtil::CreateEmptyFile(full_path);
return RESULT_SUCCESS;
}
FileUtil::IOFile file(full_path, "wb");
// Creates a sparse file (or a normal file on filesystems without the concept of sparse files)
// We do this by seeking to the right size, then writing a single null byte.
if (file.Seek(size - 1, SEEK_SET) && file.WriteBytes("", 1) == 1) {
return RESULT_SUCCESS;
}
LOG_ERROR(Service_FS, "Too large file");
// TODO(Subv): Find out the correct error code
return ResultCode(-1);
}
ResultCode Disk_FileSystem::CreateDirectory(const std::string& path) const {
// TODO(Subv): Perform path validation to prevent escaping the emulator sandbox.
std::string full_path = base_directory + path;
if (FileUtil::CreateDir(full_path)) {
return RESULT_SUCCESS;
}
LOG_CRITICAL(Service_FS, "(unreachable) Unknown error creating %s", full_path.c_str());
// TODO(wwylele): Use correct error code
return ResultCode(-1);
}
ResultCode Disk_FileSystem::RenameDirectory(const Path& src_path, const Path& dest_path) const {
LOG_WARNING(Service_FS, "(STUBBED) called");
// TODO(wwylele): Use correct error code
return ResultCode(-1);
}
ResultVal<std::unique_ptr<DirectoryBackend>> Disk_FileSystem::OpenDirectory(
const std::string& path) const {
std::string full_path = base_directory + path;
if (!FileUtil::IsDirectory(full_path)) {
// TODO(Subv): Find the correct error code for this.
return ResultCode(-1);
}
auto directory = std::make_unique<Disk_Directory>(full_path);
return MakeResult<std::unique_ptr<DirectoryBackend>>(std::move(directory));
}
u64 Disk_FileSystem::GetFreeSpaceSize() const {
LOG_WARNING(Service_FS, "(STUBBED) called");
return 0;
}
ResultVal<FileSys::EntryType> Disk_FileSystem::GetEntryType(const std::string& path) const {
std::string full_path = base_directory + path;
if (!FileUtil::Exists(full_path)) {
return ERROR_PATH_NOT_FOUND;
}
if (FileUtil::IsDirectory(full_path))
return MakeResult(EntryType::Directory);
return MakeResult(EntryType::File);
}
ResultVal<size_t> Disk_Storage::Read(const u64 offset, const size_t length, u8* buffer) const {
LOG_TRACE(Service_FS, "called offset=%llu, length=%zu", offset, length);
file->Seek(offset, SEEK_SET);
return MakeResult<size_t>(file->ReadBytes(buffer, length));
}
ResultVal<size_t> Disk_Storage::Write(const u64 offset, const size_t length, const bool flush,
const u8* buffer) const {
LOG_WARNING(Service_FS, "(STUBBED) called");
file->Seek(offset, SEEK_SET);
size_t written = file->WriteBytes(buffer, length);
if (flush) {
file->Flush();
}
return MakeResult<size_t>(written);
}
u64 Disk_Storage::GetSize() const {
return file->GetSize();
}
bool Disk_Storage::SetSize(const u64 size) const {
file->Resize(size);
file->Flush();
return true;
}
Disk_Directory::Disk_Directory(const std::string& path) {
unsigned size = FileUtil::ScanDirectoryTree(path, directory);
directory.size = size;
directory.isDirectory = true;
children_iterator = directory.children.begin();
}
u64 Disk_Directory::Read(const u64 count, Entry* entries) {
u64 entries_read = 0;
while (entries_read < count && children_iterator != directory.children.cend()) {
const FileUtil::FSTEntry& file = *children_iterator;
const std::string& filename = file.virtualName;
Entry& entry = entries[entries_read];
LOG_TRACE(Service_FS, "File %s: size=%llu dir=%d", filename.c_str(), file.size,
file.isDirectory);
// TODO(Link Mauve): use a proper conversion to UTF-16.
for (size_t j = 0; j < FILENAME_LENGTH; ++j) {
entry.filename[j] = filename[j];
if (!filename[j])
break;
}
if (file.isDirectory) {
entry.file_size = 0;
entry.type = EntryType::Directory;
} else {
entry.file_size = file.size;
entry.type = EntryType::File;
}
++entries_read;
++children_iterator;
}
return entries_read;
}
u64 Disk_Directory::GetEntryCount() const {
// We convert the children iterator into a const_iterator to allow template argument deduction
// in std::distance.
std::vector<FileUtil::FSTEntry>::const_iterator current = children_iterator;
return std::distance(current, directory.children.end());
}
} // namespace FileSys
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