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// Copyright 2014 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <algorithm>
#include <cstdio>
#include "common/common_types.h"
#include "common/file_util.h"
#include "common/logging/log.h"
#include "common/make_unique.h"
#include "core/file_sys/disk_archive.h"
////////////////////////////////////////////////////////////////////////////////////////////////////
// FileSys namespace
namespace FileSys {
ResultVal<std::unique_ptr<FileBackend>> DiskArchive::OpenFile(const Path& path, const Mode mode) const {
LOG_DEBUG(Service_FS, "called path=%s mode=%01X", path.DebugStr().c_str(), mode.hex);
auto file = Common::make_unique<DiskFile>(*this, path, mode);
ResultCode result = file->Open();
if (result.IsError())
return result;
return MakeResult<std::unique_ptr<FileBackend>>(std::move(file));
}
ResultCode DiskArchive::DeleteFile(const Path& path) const {
std::string file_path = mount_point + path.AsString();
if (FileUtil::IsDirectory(file_path))
return ResultCode(ErrorDescription::FS_NotAFile, ErrorModule::FS, ErrorSummary::Canceled, ErrorLevel::Status);
if (!FileUtil::Exists(file_path))
return ResultCode(ErrorDescription::FS_NotFound, ErrorModule::FS, ErrorSummary::NotFound, ErrorLevel::Status);
if (FileUtil::Delete(file_path))
return RESULT_SUCCESS;
return ResultCode(ErrorDescription::FS_NotAFile, ErrorModule::FS, ErrorSummary::Canceled, ErrorLevel::Status);
}
bool DiskArchive::RenameFile(const Path& src_path, const Path& dest_path) const {
return FileUtil::Rename(mount_point + src_path.AsString(), mount_point + dest_path.AsString());
}
bool DiskArchive::DeleteDirectory(const Path& path) const {
return FileUtil::DeleteDir(mount_point + path.AsString());
}
ResultCode DiskArchive::CreateFile(const FileSys::Path& path, u64 size) const {
std::string full_path = mount_point + path.AsString();
if (FileUtil::IsDirectory(full_path))
return ResultCode(ErrorDescription::FS_NotAFile, ErrorModule::FS, ErrorSummary::Canceled, ErrorLevel::Status);
if (FileUtil::Exists(full_path))
return ResultCode(ErrorDescription::FS_AlreadyExists, ErrorModule::FS, ErrorSummary::NothingHappened, ErrorLevel::Status);
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;
return ResultCode(ErrorDescription::TooLarge, ErrorModule::FS, ErrorSummary::OutOfResource, ErrorLevel::Info);
}
bool DiskArchive::CreateDirectory(const Path& path) const {
return FileUtil::CreateDir(mount_point + path.AsString());
}
bool DiskArchive::RenameDirectory(const Path& src_path, const Path& dest_path) const {
return FileUtil::Rename(mount_point + src_path.AsString(), mount_point + dest_path.AsString());
}
std::unique_ptr<DirectoryBackend> DiskArchive::OpenDirectory(const Path& path) const {
LOG_DEBUG(Service_FS, "called path=%s", path.DebugStr().c_str());
auto directory = Common::make_unique<DiskDirectory>(*this, path);
if (!directory->Open())
return nullptr;
return std::move(directory);
}
u64 DiskArchive::GetFreeBytes() const {
// TODO: Stubbed to return 1GiB
return 1024 * 1024 * 1024;
}
////////////////////////////////////////////////////////////////////////////////////////////////////
DiskFile::DiskFile(const DiskArchive& archive, const Path& path, const Mode mode) {
// TODO(Link Mauve): normalize path into an absolute path without "..", it can currently bypass
// the root directory we set while opening the archive.
// For example, opening /../../etc/passwd can give the emulated program your users list.
this->path = archive.mount_point + path.AsString();
this->mode.hex = mode.hex;
}
ResultCode DiskFile::Open() {
if (FileUtil::IsDirectory(path))
return ResultCode(ErrorDescription::FS_NotAFile, ErrorModule::FS, ErrorSummary::Canceled, ErrorLevel::Status);
// Specifying only the Create flag is invalid
if (mode.create_flag && !mode.read_flag && !mode.write_flag) {
return ResultCode(ErrorDescription::FS_InvalidOpenFlags, ErrorModule::FS, ErrorSummary::Canceled, ErrorLevel::Status);
}
if (!FileUtil::Exists(path)) {
if (!mode.create_flag) {
LOG_ERROR(Service_FS, "Non-existing file %s can't be open without mode create.", path.c_str());
return ResultCode(ErrorDescription::FS_NotFound, ErrorModule::FS, ErrorSummary::NotFound, ErrorLevel::Status);
} else {
// Create the file
FileUtil::CreateEmptyFile(path);
}
}
std::string mode_string = "";
if (mode.write_flag)
mode_string += "r+"; // Files opened with Write access can be read from
else if (mode.read_flag)
mode_string += "r";
// Open the file in binary mode, to avoid problems with CR/LF on Windows systems
mode_string += "b";
file = Common::make_unique<FileUtil::IOFile>(path, mode_string.c_str());
if (file->IsOpen())
return RESULT_SUCCESS;
return ResultCode(ErrorDescription::FS_NotFound, ErrorModule::FS, ErrorSummary::NotFound, ErrorLevel::Status);
}
ResultVal<size_t> DiskFile::Read(const u64 offset, const size_t length, u8* buffer) const {
if (!mode.read_flag && !mode.write_flag)
return ResultCode(ErrorDescription::FS_InvalidOpenFlags, ErrorModule::FS, ErrorSummary::Canceled, ErrorLevel::Status);
file->Seek(offset, SEEK_SET);
return MakeResult<size_t>(file->ReadBytes(buffer, length));
}
ResultVal<size_t> DiskFile::Write(const u64 offset, const size_t length, const bool flush, const u8* buffer) const {
if (!mode.write_flag)
return ResultCode(ErrorDescription::FS_InvalidOpenFlags, ErrorModule::FS, ErrorSummary::Canceled, ErrorLevel::Status);
file->Seek(offset, SEEK_SET);
size_t written = file->WriteBytes(buffer, length);
if (flush)
file->Flush();
return MakeResult<size_t>(written);
}
u64 DiskFile::GetSize() const {
return file->GetSize();
}
bool DiskFile::SetSize(const u64 size) const {
file->Resize(size);
file->Flush();
return true;
}
bool DiskFile::Close() const {
return file->Close();
}
////////////////////////////////////////////////////////////////////////////////////////////////////
DiskDirectory::DiskDirectory(const DiskArchive& archive, const Path& path) : directory() {
// TODO(Link Mauve): normalize path into an absolute path without "..", it can currently bypass
// the root directory we set while opening the archive.
// For example, opening /../../usr/bin can give the emulated program your installed programs.
this->path = archive.mount_point + path.AsString();
}
bool DiskDirectory::Open() {
if (!FileUtil::IsDirectory(path))
return false;
unsigned size = FileUtil::ScanDirectoryTree(path, directory);
directory.size = size;
directory.isDirectory = true;
children_iterator = directory.children.begin();
return true;
}
u32 DiskDirectory::Read(const u32 count, Entry* entries) {
u32 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;
}
FileUtil::SplitFilename83(filename, entry.short_name, entry.extension);
entry.is_directory = file.isDirectory;
entry.is_hidden = (filename[0] == '.');
entry.is_read_only = 0;
entry.file_size = file.size;
// We emulate a SD card where the archive bit has never been cleared, as it would be on
// most user SD cards.
// Some homebrews (blargSNES for instance) are known to mistakenly use the archive bit as a
// file bit.
entry.is_archive = !file.isDirectory;
++entries_read;
++children_iterator;
}
return entries_read;
}
} // namespace FileSys
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