mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
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255 lines
12 KiB
C++
255 lines
12 KiB
C++
/*
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* Copyright (c) Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stratosphere.hpp>
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#include "sysupdater_fs_utils.hpp"
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namespace ams::mitm::sysupdater {
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namespace {
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constexpr inline const char * const NcaExtension = ".nca";
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constexpr inline const char * const NspExtension = ".nsp";
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constexpr inline const size_t NcaExtensionSize = 4;
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constexpr inline const size_t NspExtensionSize = 4;
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constexpr const ams::fs::PathFlags SdCardContentMetaPathNormalizePathFlags = [] {
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fs::PathFlags flags{};
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flags.AllowMountName();
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return flags;
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}();
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static_assert(NcaExtensionSize == NspExtensionSize);
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constexpr inline const size_t NcaNspExtensionSize = NcaExtensionSize;
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Result CheckNcaOrNsp(const char **path) {
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/* Ensure that the path is currently at the mount name delimeter. */
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R_UNLESS(util::Strncmp(*path, ams::fs::impl::MountNameDelimiter, util::Strnlen(ams::fs::impl::MountNameDelimiter, ams::fs::EntryNameLengthMax)) == 0, fs::ResultPathNotFound());
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/* Advance past the :. */
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static_assert(ams::fs::impl::MountNameDelimiter[0] == ':');
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*path += 1;
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/* Ensure path is long enough for the extension. */
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const size_t path_len = util::Strnlen(*path, ams::fs::EntryNameLengthMax);
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R_UNLESS(path_len > NcaNspExtensionSize, fs::ResultPathNotFound());
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/* Get the extension. */
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const char * const extension = *path + path_len - NcaNspExtensionSize;
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/* Ensure nca or nsp. */
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const bool is_nca = util::Strnicmp(extension, NcaExtension, NcaNspExtensionSize) == 0;
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const bool is_nsp = util::Strnicmp(extension, NspExtension, NcaNspExtensionSize) == 0;
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R_UNLESS(is_nca || is_nsp, fs::ResultPathNotFound());
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R_SUCCEED();
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}
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Result ParseMountName(const char **path, std::shared_ptr<ams::fs::fsa::IFileSystem> *out) {
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/* The equivalent function here supports all the common mount names; we'll only support the SD card, system content storage. */
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if (const auto mount_len = util::Strnlen(ams::fs::impl::SdCardFileSystemMountName, ams::fs::MountNameLengthMax); util::Strncmp(*path, ams::fs::impl::SdCardFileSystemMountName, mount_len) == 0) {
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/* Advance the path. */
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*path += mount_len;
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/* Open the SD card. This uses libnx bindings. */
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FsFileSystem fs;
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R_TRY(fsOpenSdCardFileSystem(std::addressof(fs)));
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/* Allocate a new filesystem wrapper. */
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auto fsa = std::make_shared<ams::fs::RemoteFileSystem>(fs);
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R_UNLESS(fsa != nullptr, fs::ResultAllocationMemoryFailedInSdCardA());
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/* Set the output fs. */
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*out = std::move(fsa);
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} else if (const auto mount_len = util::Strnlen(ams::fs::impl::ContentStorageSystemMountName, ams::fs::MountNameLengthMax); util::Strncmp(*path, ams::fs::impl::ContentStorageSystemMountName, mount_len) == 0) {
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/* Advance the path. */
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*path += mount_len;
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/* Open the system content storage. This uses libnx bindings. */
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FsFileSystem fs;
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R_TRY(fsOpenContentStorageFileSystem(std::addressof(fs), FsContentStorageId_System));
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/* Allocate a new filesystem wrapper. */
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auto fsa = std::make_shared<ams::fs::RemoteFileSystem>(fs);
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R_UNLESS(fsa != nullptr, fs::ResultAllocationMemoryFailedInContentStorageA());
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/* Set the output fs. */
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*out = std::move(fsa);
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} else {
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R_THROW(fs::ResultPathNotFound());
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}
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/* Ensure that there's something that could be a mount name delimiter. */
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R_UNLESS(util::Strnlen(*path, fs::EntryNameLengthMax) != 0, fs::ResultPathNotFound());
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R_SUCCEED();
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}
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Result ParseNsp(const char **path, std::shared_ptr<ams::fs::fsa::IFileSystem> *out, std::shared_ptr<ams::fs::fsa::IFileSystem> base_fs) {
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const char *work_path = *path;
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/* Advance to the nsp extension. */
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while (true) {
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if (util::Strnicmp(work_path, NspExtension, NspExtensionSize) == 0) {
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if (work_path[NspExtensionSize] == '\x00' || work_path[NspExtensionSize] == '/') {
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break;
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}
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work_path += NspExtensionSize;
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} else {
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R_UNLESS(*work_path != '\x00', fs::ResultPathNotFound());
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work_path += 1;
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}
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}
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/* Advance past the extension. */
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work_path += NspExtensionSize;
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/* Get the nsp path. */
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ams::fs::Path nsp_path;
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R_TRY(nsp_path.InitializeWithNormalization(*path, work_path - *path));
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/* Open the file storage. */
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std::shared_ptr<ams::fs::FileStorageBasedFileSystem> file_storage = fssystem::AllocateShared<ams::fs::FileStorageBasedFileSystem>();
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R_UNLESS(file_storage != nullptr, fs::ResultAllocationMemoryFailedInNcaFileSystemServiceImplA());
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R_TRY(file_storage->Initialize(std::move(base_fs), nsp_path, ams::fs::OpenMode_Read));
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/* Create a partition fs. */
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R_TRY(fssystem::GetFileSystemCreatorInterfaces()->partition_fs_creator->Create(out, std::move(file_storage)));
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/* Update the path. */
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*path = work_path;
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R_SUCCEED();
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}
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Result ParseNca(const char **path, std::shared_ptr<fssystem::NcaReader> *out, std::shared_ptr<ams::fs::fsa::IFileSystem> base_fs) {
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/* Open the file storage. */
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std::shared_ptr<ams::fs::FileStorageBasedFileSystem> file_storage = fssystem::AllocateShared<ams::fs::FileStorageBasedFileSystem>();
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R_UNLESS(file_storage != nullptr, fs::ResultAllocationMemoryFailedInNcaFileSystemServiceImplB());
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/* Get the nca path. */
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ams::fs::Path nca_path;
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R_TRY(nca_path.InitializeWithNormalization(*path));
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R_TRY(file_storage->Initialize(std::move(base_fs), nca_path, ams::fs::OpenMode_Read));
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/* Create the nca reader. */
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std::shared_ptr<fssystem::NcaReader> nca_reader;
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R_TRY(fssystem::GetFileSystemCreatorInterfaces()->storage_on_nca_creator->CreateNcaReader(std::addressof(nca_reader), file_storage));
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/* NOTE: Here Nintendo validates program ID, but this does not need checking in the meta case. */
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/* Set output reader. */
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*out = std::move(nca_reader);
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R_SUCCEED();
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}
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Result OpenMetaStorage(std::shared_ptr<ams::fs::IStorage> *out, std::shared_ptr<fssystem::IAsynchronousAccessSplitter> *out_splitter, std::shared_ptr<fssystem::NcaReader> nca_reader, fssystem::NcaFsHeader::FsType *out_fs_type) {
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/* Ensure the nca is a meta nca. */
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R_UNLESS(nca_reader->GetContentType() == fssystem::NcaHeader::ContentType::Meta, fs::ResultPreconditionViolation());
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/* We only support SD card ncas, so ensure this isn't a gamecard nca. */
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R_UNLESS(nca_reader->GetDistributionType() != fssystem::NcaHeader::DistributionType::GameCard, fs::ResultPermissionDenied());
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/* Here Nintendo would call GetPartitionIndex(), but we don't need to, because it's meta. */
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constexpr int MetaPartitionIndex = 0;
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/* Open fs header reader. */
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fssystem::NcaFsHeaderReader fs_header_reader;
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R_TRY(fssystem::GetFileSystemCreatorInterfaces()->storage_on_nca_creator->Create(out, out_splitter, std::addressof(fs_header_reader), std::move(nca_reader), MetaPartitionIndex));
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/* Set the output fs type. */
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*out_fs_type = fs_header_reader.GetFsType();
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R_SUCCEED();
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}
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Result OpenContentMetaFileSystem(std::shared_ptr<ams::fs::fsa::IFileSystem> *out, const char *path) {
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/* Parse the mount name to get a filesystem. */
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const char *cur_path = path;
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std::shared_ptr<ams::fs::fsa::IFileSystem> base_fs;
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R_TRY(ParseMountName(std::addressof(cur_path), std::addressof(base_fs)));
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/* Ensure the path is an nca or nsp. */
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R_TRY(CheckNcaOrNsp(std::addressof(cur_path)));
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/* Try to parse as nsp. */
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std::shared_ptr<ams::fs::fsa::IFileSystem> nsp_fs;
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if (R_SUCCEEDED(ParseNsp(std::addressof(cur_path), std::addressof(nsp_fs), base_fs))) {
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/* nsp target is only allowed for type package, and we're assuming type meta. */
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R_UNLESS(*path != '\x00', fs::ResultInvalidArgument());
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/* Use the nsp fs as the base fs. */
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base_fs = std::move(nsp_fs);
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}
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/* Parse as nca. */
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std::shared_ptr<fssystem::NcaReader> nca_reader;
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R_TRY(ParseNca(std::addressof(cur_path), std::addressof(nca_reader), std::move(base_fs)));
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/* Open meta storage. */
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std::shared_ptr<ams::fs::IStorage> storage;
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std::shared_ptr<fssystem::IAsynchronousAccessSplitter> splitter;
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fssystem::NcaFsHeader::FsType fs_type = static_cast<fssystem::NcaFsHeader::FsType>(~0);
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R_TRY(OpenMetaStorage(std::addressof(storage), std::addressof(splitter), std::move(nca_reader), std::addressof(fs_type)));
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/* Open the appropriate interface. */
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const auto * const creator_intfs = fssystem::GetFileSystemCreatorInterfaces();
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switch (fs_type) {
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case fssystem::NcaFsHeader::FsType::PartitionFs: R_RETURN(creator_intfs->partition_fs_creator->Create(out, std::move(storage)));
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case fssystem::NcaFsHeader::FsType::RomFs: R_RETURN(creator_intfs->rom_fs_creator->Create(out, std::move(storage)));
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default:
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R_THROW(fs::ResultInvalidNcaFileSystemType());
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}
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}
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}
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bool PathView::HasPrefix(util::string_view prefix) const {
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return m_path.compare(0, prefix.length(), prefix) == 0;
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}
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bool PathView::HasSuffix(util::string_view suffix) const {
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return m_path.compare(m_path.length() - suffix.length(), suffix.length(), suffix) == 0;
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}
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util::string_view PathView::GetFileName() const {
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auto pos = m_path.find_last_of("/");
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return pos != util::string_view::npos ? m_path.substr(pos + 1) : m_path;
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}
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Result MountSdCardContentMeta(const char *mount_name, const char *path) {
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/* Sanitize input. */
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/* NOTE: This is an internal API, so we won't bother with mount name sanitization. */
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R_UNLESS(path != nullptr, fs::ResultInvalidPath());
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/* Normalize the path. */
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char normalized_path[fs::EntryNameLengthMax + 1];
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R_TRY(ams::fs::PathFormatter::Normalize(normalized_path, sizeof(normalized_path), path, std::strlen(path) + 1, SdCardContentMetaPathNormalizePathFlags));
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/* Open the filesystem. */
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std::shared_ptr<ams::fs::fsa::IFileSystem> fs;
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R_TRY(OpenContentMetaFileSystem(std::addressof(fs), normalized_path));
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/* Create a holder for the fs. */
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std::unique_ptr unique_fs = std::make_unique<fssystem::ForwardingFileSystem>(std::move(fs));
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R_UNLESS(unique_fs != nullptr, fs::ResultAllocationMemoryFailedNew());
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/* Register the fs. */
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R_RETURN(ams::fs::fsa::Register(mount_name, std::move(unique_fs)));
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}
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}
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