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fsp_srv: Implement ISaveDataInfoReader

An object to read SaveDataInfo objects, which describe a unique save on the system. This implementation iterates through all the directories in the save data space and uses the paths to reconstruct the metadata.
This commit is contained in:
Zach Hilman 2018-10-28 14:59:17 -04:00
parent 2e8177f0c9
commit 5ee19add1b

View file

@ -11,6 +11,7 @@
#include "common/assert.h"
#include "common/common_types.h"
#include "common/hex_util.h"
#include "common/logging/log.h"
#include "common/string_util.h"
#include "core/file_sys/directory.h"
@ -451,6 +452,149 @@ private:
VfsDirectoryServiceWrapper backend;
};
class ISaveDataInfoReader final : public ServiceFramework<ISaveDataInfoReader> {
public:
explicit ISaveDataInfoReader(FileSys::SaveDataSpaceId space)
: ServiceFramework("ISaveDataInfoReader") {
static const FunctionInfo functions[] = {
{0, &ISaveDataInfoReader::ReadSaveDataInfo, "ReadSaveDataInfo"},
};
RegisterHandlers(functions);
FindAllSaves(space);
}
void ReadSaveDataInfo(Kernel::HLERequestContext& ctx) {
// Calculate how many entries we can fit in the output buffer
const u64 count_entries = ctx.GetWriteBufferSize() / sizeof(SaveDataInfo);
// Cap at total number of entries.
const u64 actual_entries = std::min(count_entries, info.size() - next_entry_index);
// Determine data start and end
const auto* begin = reinterpret_cast<u8*>(info.data() + next_entry_index);
const auto* end = reinterpret_cast<u8*>(info.data() + next_entry_index + actual_entries);
const auto range_size = static_cast<std::size_t>(std::distance(begin, end));
next_entry_index += actual_entries;
// Write the data to memory
ctx.WriteBuffer(begin, range_size);
IPC::ResponseBuilder rb{ctx, 4};
rb.Push(RESULT_SUCCESS);
rb.Push(actual_entries);
}
private:
static u64 stoull_be(std::string_view str) {
if (str.size() != 16)
return 0;
const auto bytes = Common::HexStringToArray<0x8>(str);
u64 out{};
std::memcpy(&out, bytes.data(), sizeof(u64));
return Common::swap64(out);
}
static std::array<u8, 0x10> ArraySwap(const std::array<u8, 0x10>& in) {
std::array<u8, 0x10> out;
for (std::size_t i = 0; i < in.size(); ++i) {
out[0xF - i] = in[i];
}
return out;
}
void FindAllSaves(FileSys::SaveDataSpaceId space) {
const auto save_root = OpenSaveDataSpace(space);
ASSERT(save_root.Succeeded());
for (const auto& type : (*save_root)->GetSubdirectories()) {
if (type->GetName() == "save") {
for (const auto& save_id : type->GetSubdirectories()) {
for (const auto& user_id : save_id->GetSubdirectories()) {
const auto save_id_numeric = stoull_be(save_id->GetName());
const auto user_id_numeric =
ArraySwap(Common::HexStringToArray<0x10>(user_id->GetName()));
if (save_id_numeric != 0) {
// System Save Data
info.emplace_back(SaveDataInfo{
0,
space,
FileSys::SaveDataType::SystemSaveData,
{},
user_id_numeric,
save_id_numeric,
0,
user_id->GetSize(),
{},
});
continue;
}
for (const auto& title_id : user_id->GetSubdirectories()) {
const auto device =
std::all_of(user_id_numeric.begin(), user_id_numeric.end(),
[](u8 val) { return val == 0; });
info.emplace_back(SaveDataInfo{
0,
space,
device ? FileSys::SaveDataType::DeviceSaveData
: FileSys::SaveDataType::SaveData,
{},
user_id_numeric,
save_id_numeric,
stoull_be(title_id->GetName()),
title_id->GetSize(),
{},
});
}
}
}
} else if (space == FileSys::SaveDataSpaceId::TemporaryStorage) {
// Temporary Storage
for (const auto& user_id : type->GetSubdirectories()) {
for (const auto& title_id : user_id->GetSubdirectories()) {
if (!title_id->GetFiles().empty() ||
!title_id->GetSubdirectories().empty()) {
info.emplace_back(SaveDataInfo{
0,
space,
FileSys::SaveDataType::TemporaryStorage,
{},
Common::HexStringToArray<0x10, true>(user_id->GetName()),
stoull_be(type->GetName()),
stoull_be(title_id->GetName()),
title_id->GetSize(),
{},
});
}
}
}
}
}
}
struct SaveDataInfo {
u64_le save_id_unknown;
FileSys::SaveDataSpaceId space;
FileSys::SaveDataType type;
INSERT_PADDING_BYTES(0x6);
std::array<u8, 0x10> user_id;
u64_le save_id;
u64_le title_id;
u64_le save_image_size;
INSERT_PADDING_BYTES(0x28);
};
static_assert(sizeof(SaveDataInfo) == 0x60, "SaveDataInfo has incorrect size.");
std::vector<SaveDataInfo> info;
u64 next_entry_index = 0;
};
FSP_SRV::FSP_SRV() : ServiceFramework("fsp-srv") {
// clang-format off
static const FunctionInfo functions[] = {