HLE/FS: Implemented FSFile::OpenSubFile.
The File class now holds a list of connected sessions along with data unique to each session. A subfile is a window into an existing file. They have a few limitations compared to normal files: * They can't be written to. * They can't be flushed. * Their size can not be changed. * New subfiles can't be created from another subfile.
This commit is contained in:
Subv
parent
b88ed528a3
commit
c9ddd5b0ae
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@ -54,7 +54,7 @@ public:
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* associated ServerSession.
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* @param server_session ServerSession associated with the connection.
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*/
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void ClientDisconnected(SharedPtr<ServerSession> server_session);
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virtual void ClientDisconnected(SharedPtr<ServerSession> server_session);
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protected:
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/// List of sessions that are connected to this handler.
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@ -909,16 +909,12 @@ void BeginImportProgram(Service::Interface* self) {
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const FileSys::Path cia_path = {};
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auto file =
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std::make_shared<Service::FS::File>(std::make_unique<CIAFile>(media_type), cia_path);
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auto sessions = Kernel::ServerSession::CreateSessionPair(file->GetName());
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file->ClientConnected(std::get<Kernel::SharedPtr<Kernel::ServerSession>>(sessions));
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cia_installing = true;
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IPC::RequestBuilder rb = rp.MakeBuilder(1, 2);
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rb.Push(RESULT_SUCCESS); // No error
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rb.PushCopyHandles(
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Kernel::g_handle_table.Create(std::get<Kernel::SharedPtr<Kernel::ClientSession>>(sessions))
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.Unwrap());
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rb.PushCopyHandles(Kernel::g_handle_table.Create(file->Connect()).Unwrap());
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LOG_WARNING(Service_AM, "(STUBBED) media_type=%u", static_cast<u32>(media_type));
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}
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@ -2,6 +2,7 @@
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#include <algorithm>
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#include <cinttypes>
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#include <cstddef>
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#include <memory>
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@ -67,8 +68,9 @@ enum class DirectoryCommand : u32 {
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};
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File::File(std::unique_ptr<FileSys::FileBackend>&& backend, const FileSys::Path& path)
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: ServiceFramework("", 1), path(path), priority(0), backend(std::move(backend)) {
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: ServiceFramework("", 1), path(path), backend(std::move(backend)) {
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static const FunctionInfo functions[] = {
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{0x08010100, &File::OpenSubFile, "OpenSubFile"},
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{0x080200C2, &File::Read, "Read"},
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{0x08030102, &File::Write, "Write"},
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{0x08040000, &File::GetSize, "GetSize"},
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@ -90,6 +92,16 @@ void File::Read(Kernel::HLERequestContext& ctx) {
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LOG_TRACE(Service_FS, "Read %s: offset=0x%" PRIx64 " length=0x%08X", GetName().c_str(), offset,
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length);
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const SessionSlot& file = GetSessionSlot(ctx.Session());
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if (file.subfile && length > file.size) {
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LOG_WARNING(Service_FS, "Trying to read beyond the subfile size, truncating");
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length = file.size;
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}
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// This file session might have a specific offset from where to start reading, apply it.
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offset += file.offset;
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if (offset + length > backend->GetSize()) {
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LOG_ERROR(Service_FS, "Reading from out of bounds offset=0x%" PRIx64
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" length=0x%08X file_size=0x%" PRIx64,
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@ -122,6 +134,16 @@ void File::Write(Kernel::HLERequestContext& ctx) {
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IPC::RequestBuilder rb = rp.MakeBuilder(2, 2);
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const SessionSlot& file = GetSessionSlot(ctx.Session());
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// Subfiles can not be written to
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if (file.subfile) {
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rb.Push(FileSys::ERROR_UNSUPPORTED_OPEN_FLAGS);
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rb.Push<u32>(0);
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rb.PushMappedBuffer(buffer);
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return;
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}
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std::vector<u8> data(length);
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buffer.Read(data.data(), 0, data.size());
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ResultVal<size_t> written = backend->Write(offset, data.size(), flush != 0, data.data());
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@ -137,20 +159,41 @@ void File::Write(Kernel::HLERequestContext& ctx) {
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void File::GetSize(Kernel::HLERequestContext& ctx) {
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IPC::RequestParser rp(ctx, 0x0804, 0, 0);
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const SessionSlot& file = GetSessionSlot(ctx.Session());
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IPC::RequestBuilder rb = rp.MakeBuilder(3, 0);
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rb.Push(RESULT_SUCCESS);
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rb.Push(backend->GetSize());
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rb.Push<u64>(file.size);
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}
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void File::SetSize(Kernel::HLERequestContext& ctx) {
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IPC::RequestParser rp(ctx, 0x0805, 2, 0);
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backend->SetSize(rp.Pop<u64>());
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u64 size = rp.Pop<u64>();
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SessionSlot& file = GetSessionSlot(ctx.Session());
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IPC::RequestBuilder rb = rp.MakeBuilder(1, 0);
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// SetSize can not be called on subfiles.
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if (file.subfile) {
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rb.Push(FileSys::ERROR_UNSUPPORTED_OPEN_FLAGS);
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return;
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}
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file.size = size;
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backend->SetSize(size);
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rb.Push(RESULT_SUCCESS);
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}
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void File::Close(Kernel::HLERequestContext& ctx) {
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IPC::RequestParser rp(ctx, 0x0808, 0, 0);
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// TODO(Subv): Only close the backend if this client is the only one left.
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if (session_slots.size() > 1)
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LOG_WARNING(Service_FS, "Closing File backend but %zu clients still connected",
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session_slots.size());
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backend->Close();
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IPC::RequestBuilder rb = rp.MakeBuilder(1, 0);
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rb.Push(RESULT_SUCCESS);
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@ -158,23 +201,38 @@ void File::Close(Kernel::HLERequestContext& ctx) {
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void File::Flush(Kernel::HLERequestContext& ctx) {
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IPC::RequestParser rp(ctx, 0x0809, 0, 0);
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backend->Flush();
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IPC::RequestBuilder rb = rp.MakeBuilder(1, 0);
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const SessionSlot& file = GetSessionSlot(ctx.Session());
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// Subfiles can not be flushed.
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if (file.subfile) {
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rb.Push(FileSys::ERROR_UNSUPPORTED_OPEN_FLAGS);
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return;
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}
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backend->Flush();
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rb.Push(RESULT_SUCCESS);
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}
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void File::SetPriority(Kernel::HLERequestContext& ctx) {
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IPC::RequestParser rp(ctx, 0x080A, 1, 0);
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priority = rp.Pop<u32>();
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SessionSlot& file = GetSessionSlot(ctx.Session());
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file.priority = rp.Pop<u32>();
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IPC::RequestBuilder rb = rp.MakeBuilder(1, 0);
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rb.Push(RESULT_SUCCESS);
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}
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void File::GetPriority(Kernel::HLERequestContext& ctx) {
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IPC::RequestParser rp(ctx, 0x080B, 0, 0);
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const SessionSlot& file = GetSessionSlot(ctx.Session());
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IPC::RequestBuilder rb = rp.MakeBuilder(2, 0);
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rb.Push(RESULT_SUCCESS);
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rb.Push(priority);
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rb.Push(file.priority);
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}
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void File::OpenLinkFile(Kernel::HLERequestContext& ctx) {
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@ -185,13 +243,104 @@ void File::OpenLinkFile(Kernel::HLERequestContext& ctx) {
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IPC::RequestParser rp(ctx, 0x080C, 0, 0);
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IPC::RequestBuilder rb = rp.MakeBuilder(1, 2);
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auto sessions = ServerSession::CreateSessionPair(GetName());
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ClientConnected(std::get<SharedPtr<ServerSession>>(sessions));
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auto server = std::get<SharedPtr<ServerSession>>(sessions);
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ClientConnected(server);
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const SessionSlot& original_file = GetSessionSlot(ctx.Session());
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SessionSlot slot{};
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slot.priority = original_file.priority;
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slot.offset = 0;
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slot.size = backend->GetSize();
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slot.session = server;
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slot.subfile = false;
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session_slots.emplace_back(std::move(slot));
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rb.Push(RESULT_SUCCESS);
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rb.PushMoveObjects(std::get<SharedPtr<ClientSession>>(sessions));
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}
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File::~File() {}
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void File::OpenSubFile(Kernel::HLERequestContext& ctx) {
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IPC::RequestParser rp(ctx, 0x0801, 4, 0);
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s64 offset = rp.PopRaw<s64>();
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s64 size = rp.PopRaw<s64>();
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IPC::RequestBuilder rb = rp.MakeBuilder(1, 2);
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const SessionSlot& original_file = GetSessionSlot(ctx.Session());
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if (original_file.subfile) {
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// OpenSubFile can not be called on a file which is already as subfile
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rb.Push(FileSys::ERROR_UNSUPPORTED_OPEN_FLAGS);
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return;
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}
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if (offset < 0 || size < 0) {
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rb.Push(FileSys::ERR_WRITE_BEYOND_END);
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return;
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}
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size_t end = offset + size;
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// TODO(Subv): Check for overflow and return ERR_WRITE_BEYOND_END
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if (end > original_file.size) {
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rb.Push(FileSys::ERR_WRITE_BEYOND_END);
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return;
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}
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using Kernel::ClientSession;
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using Kernel::ServerSession;
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using Kernel::SharedPtr;
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auto sessions = ServerSession::CreateSessionPair(GetName());
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auto server = std::get<SharedPtr<ServerSession>>(sessions);
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ClientConnected(server);
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SessionSlot slot{};
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slot.priority = original_file.priority;
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slot.offset = offset;
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slot.size = size;
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slot.session = server;
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slot.subfile = true;
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session_slots.emplace_back(std::move(slot));
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rb.Push(RESULT_SUCCESS);
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rb.PushMoveObjects(std::get<SharedPtr<ClientSession>>(sessions));
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}
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File::SessionSlot& File::GetSessionSlot(Kernel::SharedPtr<Kernel::ServerSession> session) {
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auto itr = std::find_if(session_slots.begin(), session_slots.end(),
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[&](const SessionSlot& slot) { return slot.session == session; });
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ASSERT(itr != session_slots.end());
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return *itr;
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}
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void File::ClientDisconnected(Kernel::SharedPtr<Kernel::ServerSession> server_session) {
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session_slots.erase(
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std::remove_if(session_slots.begin(), session_slots.end(),
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[&](const SessionSlot& slot) { return slot.session == server_session; }),
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session_slots.end());
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SessionRequestHandler::ClientDisconnected(server_session);
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}
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Kernel::SharedPtr<Kernel::ClientSession> File::Connect() {
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auto sessions = Kernel::ServerSession::CreateSessionPair(GetName());
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auto server = std::get<Kernel::SharedPtr<Kernel::ServerSession>>(sessions);
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ClientConnected(server);
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SessionSlot slot{};
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slot.priority = 0;
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slot.offset = 0;
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slot.size = backend->GetSize();
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slot.session = server;
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slot.subfile = false;
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session_slots.emplace_back(std::move(slot));
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return std::get<Kernel::SharedPtr<Kernel::ClientSession>>(sessions);
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}
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Directory::Directory(std::unique_ptr<FileSys::DirectoryBackend>&& backend,
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const FileSys::Path& path)
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@ -6,16 +6,18 @@
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#include <memory>
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#include <string>
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#include <vector>
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#include "common/common_types.h"
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#include "core/file_sys/archive_backend.h"
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#include "core/hle/kernel/hle_ipc.h"
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#include "core/hle/kernel/kernel.h"
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#include "core/hle/result.h"
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#include "core/hle/service/service.h"
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namespace FileSys {
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class DirectoryBackend;
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class FileBackend;
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}
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} // namespace FileSys
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/// The unique system identifier hash, also known as ID0
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static constexpr char SYSTEM_ID[]{"00000000000000000000000000000000"};
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@ -53,16 +55,20 @@ typedef u64 ArchiveHandle;
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class File final : public ServiceFramework<File> {
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public:
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File(std::unique_ptr<FileSys::FileBackend>&& backend, const FileSys::Path& path);
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~File();
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~File() = default;
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std::string GetName() const {
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return "Path: " + path.DebugStr();
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}
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FileSys::Path path; ///< Path of the file
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u32 priority; ///< Priority of the file. TODO(Subv): Find out what this means
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FileSys::Path path; ///< Path of the file
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std::unique_ptr<FileSys::FileBackend> backend; ///< File backend interface
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/// Creates a new session to this File and returns the ClientSession part of the connection.
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Kernel::SharedPtr<Kernel::ClientSession> Connect();
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void ClientDisconnected(Kernel::SharedPtr<Kernel::ServerSession> server_session) override;
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private:
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void Read(Kernel::HLERequestContext& ctx);
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void Write(Kernel::HLERequestContext& ctx);
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@ -73,6 +79,19 @@ private:
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void SetPriority(Kernel::HLERequestContext& ctx);
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void GetPriority(Kernel::HLERequestContext& ctx);
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void OpenLinkFile(Kernel::HLERequestContext& ctx);
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void OpenSubFile(Kernel::HLERequestContext& ctx);
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struct SessionSlot {
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Kernel::SharedPtr<Kernel::ServerSession> session; ///< The session that this slot refers to.
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u32 priority; ///< Priority of the file. TODO(Subv): Find out what this means
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u64 offset; ///< Offset that this session will start reading from.
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u64 size; ///< Max size of the file that this session is allowed to access
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bool subfile; ///< Whether this file was opened via OpenSubFile or not.
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};
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std::vector<SessionSlot> session_slots;
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SessionSlot& GetSessionSlot(Kernel::SharedPtr<Kernel::ServerSession> session);
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};
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class Directory final : public Kernel::SessionRequestHandler {
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@ -86,11 +86,7 @@ static void OpenFile(Service::Interface* self) {
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rb.Push(file_res.Code());
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if (file_res.Succeeded()) {
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std::shared_ptr<File> file = *file_res;
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auto sessions = ServerSession::CreateSessionPair(file->GetName());
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file->ClientConnected(std::get<SharedPtr<ServerSession>>(sessions));
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rb.PushMoveHandles(
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Kernel::g_handle_table.Create(std::get<SharedPtr<ClientSession>>(sessions)).Unwrap());
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rb.PushMoveHandles(Kernel::g_handle_table.Create(file->Connect()).Unwrap());
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} else {
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rb.PushMoveHandles(0);
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LOG_ERROR(Service_FS, "failed to get a handle for file %s", file_path.DebugStr().c_str());
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@ -152,11 +148,7 @@ static void OpenFileDirectly(Service::Interface* self) {
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cmd_buff[1] = file_res.Code().raw;
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if (file_res.Succeeded()) {
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std::shared_ptr<File> file = *file_res;
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auto sessions = ServerSession::CreateSessionPair(file->GetName());
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file->ClientConnected(std::get<SharedPtr<ServerSession>>(sessions));
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cmd_buff[3] =
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Kernel::g_handle_table.Create(std::get<SharedPtr<ClientSession>>(sessions)).Unwrap();
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cmd_buff[3] = Kernel::g_handle_table.Create(file->Connect()).Unwrap();
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} else {
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cmd_buff[3] = 0;
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LOG_ERROR(Service_FS, "failed to get a handle for file %s mode=%u attributes=%u",
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