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FileSys: add ExtSaveDataArchive

ExtSaveData is more similar to SaveData, so let it be a subclass of SaveData
This commit is contained in:
wwylele 2016-10-17 20:23:34 +08:00
parent 7166fdc490
commit a879984c06
2 changed files with 115 additions and 1 deletions

View File

@ -11,6 +11,9 @@
#include "common/string_util.h"
#include "core/file_sys/archive_extsavedata.h"
#include "core/file_sys/disk_archive.h"
#include "core/file_sys/errors.h"
#include "core/file_sys/path_parser.h"
#include "core/file_sys/savedata_archive.h"
#include "core/hle/service/fs/archive.h"
////////////////////////////////////////////////////////////////////////////////////////////////////
@ -18,6 +21,116 @@
namespace FileSys {
/**
* A modified version of DiskFile for fixed-size file used by ExtSaveData
* The file size can't be changed by SetSize or Write.
*/
class FixSizeDiskFile : public DiskFile {
public:
FixSizeDiskFile(FileUtil::IOFile&& file, const Mode& mode) : DiskFile(std::move(file), mode) {
size = GetSize();
}
bool SetSize(u64 size) const override {
return false;
}
ResultVal<size_t> Write(u64 offset, size_t length, bool flush,
const u8* buffer) const override {
if (offset > size) {
return ResultCode(ErrorDescription::FS_WriteBeyondEnd, ErrorModule::FS,
ErrorSummary::InvalidArgument, ErrorLevel::Usage);
} else if (offset == size) {
return MakeResult<size_t>(0);
}
if (offset + length > size) {
length = size - offset;
}
return DiskFile::Write(offset, length, flush, buffer);
}
private:
u64 size{};
};
/**
* Archive backend for general extsave data archive type.
* The behaviour of ExtSaveDataArchive is almost the same as SaveDataArchive, except for
* - file size can't be changed once created (thus creating zero-size file and openning with create
* flag are prohibited);
* - always open a file with read+write permission.
*/
class ExtSaveDataArchive : public SaveDataArchive {
public:
ExtSaveDataArchive(const std::string& mount_point) : SaveDataArchive(mount_point) {}
std::string GetName() const override {
return "ExtSaveDataArchive: " + mount_point;
}
ResultVal<std::unique_ptr<FileBackend>> OpenFile(const Path& path,
const Mode& mode) const override {
LOG_DEBUG(Service_FS, "called path=%s mode=%01X", path.DebugStr().c_str(), mode.hex);
const PathParser path_parser(path);
if (!path_parser.IsValid()) {
LOG_ERROR(Service_FS, "Invalid path %s", path.DebugStr().c_str());
return ERROR_INVALID_PATH;
}
if (mode.hex == 0) {
LOG_ERROR(Service_FS, "Empty open mode");
return ERROR_UNSUPPORTED_OPEN_FLAGS;
}
if (mode.create_flag) {
LOG_ERROR(Service_FS, "Create flag is not supported");
return ERROR_UNSUPPORTED_OPEN_FLAGS;
}
const auto full_path = path_parser.BuildHostPath(mount_point);
switch (path_parser.GetHostStatus(mount_point)) {
case PathParser::InvalidMountPoint:
LOG_CRITICAL(Service_FS, "(unreachable) Invalid mount point %s", mount_point.c_str());
return ERROR_FILE_NOT_FOUND;
case PathParser::PathNotFound:
LOG_ERROR(Service_FS, "Path not found %s", full_path.c_str());
return ERROR_PATH_NOT_FOUND;
case PathParser::FileInPath:
case PathParser::DirectoryFound:
LOG_ERROR(Service_FS, "Unexpected file or directory in %s", full_path.c_str());
return ERROR_UNEXPECTED_FILE_OR_DIRECTORY;
case PathParser::NotFound:
LOG_ERROR(Service_FS, "%s not found", full_path.c_str());
return ERROR_FILE_NOT_FOUND;
}
FileUtil::IOFile file(full_path, "r+b");
if (!file.IsOpen()) {
LOG_CRITICAL(Service_FS, "(unreachable) Unknown error opening %s", full_path.c_str());
return ERROR_FILE_NOT_FOUND;
}
Mode rwmode;
rwmode.write_flag.Assign(1);
rwmode.read_flag.Assign(1);
auto disk_file = std::make_unique<FixSizeDiskFile>(std::move(file), rwmode);
return MakeResult<std::unique_ptr<FileBackend>>(std::move(disk_file));
}
ResultCode CreateFile(const Path& path, u64 size) const override {
if (size == 0) {
LOG_ERROR(Service_FS, "Zero-size file is not supported");
return ERROR_UNSUPPORTED_OPEN_FLAGS;
}
return SaveDataArchive::CreateFile(path, size);
}
};
std::string GetExtSaveDataPath(const std::string& mount_point, const Path& path) {
std::vector<u8> vec_data = path.AsBinary();
const u32* data = reinterpret_cast<const u32*>(vec_data.data());
@ -84,7 +197,7 @@ ResultVal<std::unique_ptr<ArchiveBackend>> ArchiveFactory_ExtSaveData::Open(cons
ErrorSummary::InvalidState, ErrorLevel::Status);
}
}
auto archive = std::make_unique<DiskArchive>(fullpath);
auto archive = std::make_unique<ExtSaveDataArchive>(fullpath);
return MakeResult<std::unique_ptr<ArchiveBackend>>(std::move(archive));
}

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@ -34,6 +34,7 @@ enum class ErrorDescription : u32 {
513, // TODO(purpasmart): Check if this name fits its actual usage
GPU_FirstInitialization = 519,
FS_InvalidPath = 702,
FS_WriteBeyondEnd = 705,
FS_UnsupportedOpenFlags = 760,
FS_UnexpectedFileOrDirectory = 770,
InvalidSection = 1000,