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https://github.com/Atmosphere-NX/Atmosphere.git
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262 lines
11 KiB
C++
262 lines
11 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 "ncm_fs_utils.hpp"
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namespace ams::ncm {
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namespace {
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Result MountContentMetaByRemoteFileSystemProxy(const char *mount_name, const char *path) {
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R_RETURN(fs::MountContent(mount_name, path, fs::ContentType_Meta));
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}
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constinit MountContentMetaFunction g_mount_content_meta_func = MountContentMetaByRemoteFileSystemProxy;
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}
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namespace impl {
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Result MountContentMetaImpl(const char *mount_name, const char *path) {
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R_RETURN(g_mount_content_meta_func(mount_name, path));
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}
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}
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bool IsContentMetaFileName(const char *name) {
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return impl::PathView(name).HasSuffix(".cnmt");
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}
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Result ReadContentMetaPathAlongWithExtendedDataAndDigest(AutoBuffer *out, const char *path) {
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/* Mount the content. */
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auto mount_name = impl::CreateUniqueMountName();
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R_TRY(impl::MountContentMetaImpl(mount_name.str, path));
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ON_SCOPE_EXIT { fs::Unmount(mount_name.str); };
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/* Open the root directory. */
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auto root_path = impl::GetRootDirectoryPath(mount_name);
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fs::DirectoryHandle dir;
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R_TRY(fs::OpenDirectory(std::addressof(dir), root_path.str, fs::OpenDirectoryMode_File));
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ON_SCOPE_EXIT { fs::CloseDirectory(dir); };
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/* Loop directory reading until we find the entry we're looking for. */
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while (true) {
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/* Read one entry, and finish when we fail to read. */
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fs::DirectoryEntry entry;
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s64 num_read;
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R_TRY(fs::ReadDirectory(std::addressof(num_read), std::addressof(entry), dir, 1));
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if (num_read == 0) {
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break;
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}
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/* If this is the content meta file, parse it. */
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if (IsContentMetaFileName(entry.name)) {
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/* Create the file path. */
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impl::FilePathString file_path(root_path.str);
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file_path.Append(entry.name);
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/* Open the content meta file. */
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fs::FileHandle file;
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R_TRY(fs::OpenFile(std::addressof(file), file_path, fs::OpenMode_Read));
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ON_SCOPE_EXIT { fs::CloseFile(file); };
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/* Get the meta size. */
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s64 file_size;
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R_TRY(fs::GetFileSize(std::addressof(file_size), file));
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const size_t meta_size = static_cast<size_t>(file_size);
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/* Create a buffer for the meta. */
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R_TRY(out->Initialize(meta_size));
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/* Read the meta into the buffer. */
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R_RETURN(fs::ReadFile(file, 0, out->Get(), meta_size));
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}
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}
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R_THROW(ncm::ResultContentMetaNotFound());
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}
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Result ReadContentMetaPathAlongWithExtendedDataAndDigestSuppressingFsAbort(AutoBuffer *out, const char *path) {
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fs::ScopedAutoAbortDisabler aad;
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R_RETURN(ReadContentMetaPathAlongWithExtendedDataAndDigest(out, path));
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}
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Result ReadContentMetaPathWithoutExtendedDataOrDigest(AutoBuffer *out, const char *path) {
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/* Mount the content. */
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auto mount_name = impl::CreateUniqueMountName();
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R_TRY(impl::MountContentMetaImpl(mount_name.str, path));
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ON_SCOPE_EXIT { fs::Unmount(mount_name.str); };
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/* Open the root directory. */
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auto root_path = impl::GetRootDirectoryPath(mount_name);
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fs::DirectoryHandle dir;
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R_TRY(fs::OpenDirectory(std::addressof(dir), root_path.str, fs::OpenDirectoryMode_File));
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ON_SCOPE_EXIT { fs::CloseDirectory(dir); };
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/* Loop directory reading until we find the entry we're looking for. */
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while (true) {
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/* Read one entry, and finish when we fail to read. */
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fs::DirectoryEntry entry;
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s64 num_read;
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R_TRY(fs::ReadDirectory(std::addressof(num_read), std::addressof(entry), dir, 1));
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if (num_read == 0) {
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break;
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}
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/* If this is the content meta file, parse it. */
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if (IsContentMetaFileName(entry.name)) {
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/* Create the file path. */
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impl::FilePathString file_path(root_path.str);
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file_path.Append(entry.name);
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/* Open the content meta file. */
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fs::FileHandle file;
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R_TRY(fs::OpenFile(std::addressof(file), file_path, fs::OpenMode_Read));
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ON_SCOPE_EXIT { fs::CloseFile(file); };
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/* Get the meta size. */
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s64 file_size;
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R_TRY(fs::GetFileSize(std::addressof(file_size), file));
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const size_t meta_file_size = static_cast<size_t>(file_size);
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/* Check that the meta size is large enough. */
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R_UNLESS(meta_file_size >= sizeof(PackagedContentMetaHeader), ncm::ResultInvalidContentMetaFileSize());
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/* Read the header. */
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PackagedContentMetaHeader header;
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size_t read_size = 0;
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R_TRY(fs::ReadFile(std::addressof(read_size), file, 0, std::addressof(header), sizeof(header)));
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/* Check the right size was read. */
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R_UNLESS(read_size == sizeof(PackagedContentMetaHeader), ncm::ResultInvalidContentMetaFileSize());
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/* Determine the meta size. */
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const size_t meta_size = PackagedContentMetaReader(std::addressof(header), sizeof(header)).GetExtendedDataOffset();
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/* Create a buffer for the meta. */
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R_TRY(out->Initialize(meta_size));
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/* Read the meta into the buffer. */
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R_RETURN(fs::ReadFile(file, 0, out->Get(), meta_size));
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}
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}
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R_THROW(ncm::ResultContentMetaNotFound());
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}
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Result ReadContentMetaPathWithoutExtendedDataOrDigestSuppressingFsAbort(AutoBuffer *out, const char *path) {
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fs::ScopedAutoAbortDisabler aad;
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R_RETURN(ReadContentMetaPathAlongWithExtendedDataAndDigest(out, path));
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}
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Result ReadVariationContentMetaInfoList(s32 *out_count, std::unique_ptr<ContentMetaInfo[]> *out_meta_infos, const Path &path, FirmwareVariationId firmware_variation_id) {
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AutoBuffer meta;
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R_TRY(ReadContentMetaPathAlongWithExtendedDataAndDigestSuppressingFsAbort(std::addressof(meta), path.str));
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/* Create a reader for the content meta. */
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PackagedContentMetaReader reader(meta.Get(), meta.GetSize());
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/* Define a helper to output the base meta infos. */
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const auto ReadMetaInfoListFromBase = [&] () ALWAYS_INLINE_LAMBDA -> Result {
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/* Output the base content meta info count. */
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*out_count = reader.GetContentMetaCount();
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/* Create a buffer to hold the infos. NOTE: N does not check for nullptr before accessing. */
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std::unique_ptr<ContentMetaInfo[]> buffer(new (std::nothrow) ContentMetaInfo[reader.GetContentMetaCount()]);
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AMS_ABORT_UNLESS(buffer != nullptr);
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/* Copy all base meta infos to output */
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for (size_t i = 0; i < reader.GetContentMetaCount(); i++) {
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buffer[i] = *reader.GetContentMetaInfo(i);
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}
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/* Write out the buffer we've populated. */
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*out_meta_infos = std::move(buffer);
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R_SUCCEED();
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};
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/* If there are no firmware variations to list, read meta infos from base. */
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R_UNLESS(reader.GetExtendedDataSize() != 0, ReadMetaInfoListFromBase());
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SystemUpdateMetaExtendedDataReader extended_data_reader(reader.GetExtendedData(), reader.GetExtendedDataSize());
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util::optional<s32> firmware_variation_index = util::nullopt;
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/* NOTE: Atmosphere extension to support downgrading. */
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/* If all firmware variations refer to base, don't require the current variation be present. */
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bool force_refer_to_base = true;
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/* Find the input firmware variation id. */
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for (size_t i = 0; i < extended_data_reader.GetFirmwareVariationCount(); i++) {
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if (*extended_data_reader.GetFirmwareVariationId(i) == firmware_variation_id) {
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firmware_variation_index = i;
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break;
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} else {
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/* Check if the current variation refers to base. */
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const FirmwareVariationInfo *cur_variation_info = extended_data_reader.GetFirmwareVariationInfo(i);
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const bool cur_refers_to_base = extended_data_reader.GetHeader()->version == 1 || cur_variation_info->refer_to_base;
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/* We force referral to base on unsupported variation only if all supported variations refer to base. */
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force_refer_to_base &= cur_refers_to_base;
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}
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}
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/* We couldn't find the input firmware variation id. */
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if (!firmware_variation_index) {
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/* Unless we can force a referral to base, the firmware isn't supported. */
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R_UNLESS(force_refer_to_base, ncm::ResultInvalidFirmwareVariation());
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/* Force a referral to base. */
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R_RETURN(ReadMetaInfoListFromBase());
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}
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/* Obtain the variation info. */
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const FirmwareVariationInfo *variation_info = extended_data_reader.GetFirmwareVariationInfo(*firmware_variation_index);
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/* Refer to base if variation info says we should, or if version is 1. */
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const bool refer_to_base = extended_data_reader.GetHeader()->version == 1 || variation_info->refer_to_base;
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R_UNLESS(!refer_to_base, ReadMetaInfoListFromBase());
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/* Output the content meta count. */
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const u32 content_meta_count = variation_info->content_meta_count;
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*out_count = content_meta_count;
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/* We're done if there are no content metas to list. */
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R_SUCCEED_IF(content_meta_count == 0);
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/* Allocate a buffer for the content meta infos. */
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std::unique_ptr<ContentMetaInfo[]> buffer(new (std::nothrow) ContentMetaInfo[content_meta_count]);
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AMS_ABORT_UNLESS(buffer != nullptr);
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/* Get the content meta infos. */
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Span<const ContentMetaInfo> meta_infos;
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extended_data_reader.GetContentMetaInfoList(std::addressof(meta_infos), content_meta_count);
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/* Copy the meta infos to the buffer. */
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for (size_t i = 0; i < content_meta_count; i++) {
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buffer[i] = meta_infos[i];
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}
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/* Output the content meta info buffer. */
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*out_meta_infos = std::move(buffer);
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R_SUCCEED();
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}
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void SetMountContentMetaFunction(MountContentMetaFunction func) {
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g_mount_content_meta_func = func;
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}
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}
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