mirror of
https://github.com/Atmosphere-NX/Atmosphere
synced 2024-12-24 13:31:12 +00:00
171 lines
7.4 KiB
C++
171 lines
7.4 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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namespace ams::sf::cmif {
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namespace {
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constexpr inline u32 InHeaderMagic = util::FourCC<'S','F','C','I'>::Code;
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constexpr inline u32 OutHeaderMagic = util::FourCC<'S','F','C','O'>::Code;
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#if defined(ATMOSPHERE_OS_HORIZON)
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static_assert(InHeaderMagic == CMIF_IN_HEADER_MAGIC);
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static_assert(OutHeaderMagic == CMIF_OUT_HEADER_MAGIC);
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#endif
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ALWAYS_INLINE decltype(ServiceCommandMeta::handler) FindCommandHandlerByBinarySearch(const ServiceCommandMeta *entries, const size_t entry_count, const u32 cmd_id, const hos::Version hos_version) {
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/* Binary search for the handler. */
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ssize_t lo = 0;
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ssize_t hi = entry_count - 1;
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while (lo <= hi) {
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const size_t mid = (lo + hi) / 2;
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if (entries[mid].cmd_id < cmd_id) {
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lo = mid + 1;
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} else if (entries[mid].cmd_id > cmd_id) {
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hi = mid - 1;
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} else {
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/* Find start. */
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size_t start = mid;
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while (start > 0 && entries[start - 1].cmd_id == cmd_id) {
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--start;
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}
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/* Find end. */
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size_t end = mid + 1;
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while (end < entry_count && entries[end].cmd_id == cmd_id) {
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++end;
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}
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for (size_t idx = start; idx < end; ++idx) {
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if (entries[idx].MatchesVersion(hos_version)) {
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return entries[idx].GetHandler();
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}
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}
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break;
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}
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}
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return nullptr;
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}
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ALWAYS_INLINE decltype(ServiceCommandMeta::handler) FindCommandHandlerByLinearSearch(const ServiceCommandMeta *entries, const size_t entry_count, const u32 cmd_id, const hos::Version hos_version) {
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for (size_t i = 0; i < entry_count; ++i) {
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if (entries[i].Matches(cmd_id, hos_version)) {
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return entries[i].GetHandler();
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break;
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}
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}
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return nullptr;
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}
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ALWAYS_INLINE decltype(ServiceCommandMeta::handler) FindCommandHandler(const ServiceCommandMeta *entries, const size_t entry_count, const u32 cmd_id, const hos::Version hos_version) {
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if (entry_count >= 8) {
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return FindCommandHandlerByBinarySearch(entries, entry_count, cmd_id, hos_version);
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} else {
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return FindCommandHandlerByLinearSearch(entries, entry_count, cmd_id, hos_version);
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}
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}
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}
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Result impl::ServiceDispatchTableBase::ProcessMessageImpl(ServiceDispatchContext &ctx, const cmif::PointerAndSize &in_raw_data, const ServiceCommandMeta *entries, const size_t entry_count) const {
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/* Get versioning info. */
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const auto hos_version = hos::GetVersion();
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const u32 max_cmif_version = hos_version >= hos::Version_5_0_0 ? 1 : 0;
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/* Parse the CMIF in header. */
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const CmifInHeader *in_header = reinterpret_cast<const CmifInHeader *>(in_raw_data.GetPointer());
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R_UNLESS(in_raw_data.GetSize() >= sizeof(*in_header), sf::cmif::ResultInvalidHeaderSize());
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R_UNLESS(in_header->magic == InHeaderMagic && in_header->version <= max_cmif_version, sf::cmif::ResultInvalidInHeader());
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const cmif::PointerAndSize in_message_raw_data = cmif::PointerAndSize(in_raw_data.GetAddress() + sizeof(*in_header), in_raw_data.GetSize() - sizeof(*in_header));
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const u32 cmd_id = in_header->command_id;
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/* Find a handler. */
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const auto cmd_handler = FindCommandHandler(entries, entry_count, cmd_id, hos_version);
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R_UNLESS(cmd_handler != nullptr, sf::cmif::ResultUnknownCommandId());
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/* Invoke handler. */
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CmifOutHeader *out_header = nullptr;
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Result command_result = cmd_handler(&out_header, ctx, in_message_raw_data);
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/* Forward any meta-context change result. */
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if (sf::impl::ResultRequestContextChanged::Includes(command_result)) {
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return command_result;
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}
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/* Otherwise, ensure that we're able to write the output header. */
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if (out_header == nullptr) {
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AMS_ABORT_UNLESS(R_FAILED(command_result));
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return command_result;
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}
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/* Write output header to raw data. */
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*out_header = CmifOutHeader{OutHeaderMagic, 0, command_result.GetValue(), 0};
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return ResultSuccess();
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}
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#if AMS_SF_MITM_SUPPORTED
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Result impl::ServiceDispatchTableBase::ProcessMessageForMitmImpl(ServiceDispatchContext &ctx, const cmif::PointerAndSize &in_raw_data, const ServiceCommandMeta *entries, const size_t entry_count) const {
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/* Get versioning info. */
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const auto hos_version = hos::GetVersion();
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const u32 max_cmif_version = hos_version >= hos::Version_5_0_0 ? 1 : 0;
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/* Parse the CMIF in header. */
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const CmifInHeader *in_header = reinterpret_cast<const CmifInHeader *>(in_raw_data.GetPointer());
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R_UNLESS(in_raw_data.GetSize() >= sizeof(*in_header), sf::cmif::ResultInvalidHeaderSize());
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R_UNLESS(in_header->magic == InHeaderMagic && in_header->version <= max_cmif_version, sf::cmif::ResultInvalidInHeader());
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const cmif::PointerAndSize in_message_raw_data = cmif::PointerAndSize(in_raw_data.GetAddress() + sizeof(*in_header), in_raw_data.GetSize() - sizeof(*in_header));
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const u32 cmd_id = in_header->command_id;
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/* Find a handler. */
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const auto cmd_handler = FindCommandHandler(entries, entry_count, cmd_id, hos_version);
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/* If we didn't find a handler, forward the request. */
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if (cmd_handler == nullptr) {
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return ctx.session->ForwardRequest(ctx);
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}
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/* Invoke handler. */
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CmifOutHeader *out_header = nullptr;
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Result command_result = cmd_handler(&out_header, ctx, in_message_raw_data);
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/* If we should, forward the request to the forward session. */
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if (sm::mitm::ResultShouldForwardToSession::Includes(command_result)) {
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return ctx.session->ForwardRequest(ctx);
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}
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/* Forward any meta-context change result. */
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if (sf::impl::ResultRequestContextChanged::Includes(command_result)) {
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return command_result;
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}
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/* Otherwise, ensure that we're able to write the output header. */
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if (out_header == nullptr) {
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AMS_ABORT_UNLESS(R_FAILED(command_result));
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return command_result;
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}
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/* Write output header to raw data. */
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*out_header = CmifOutHeader{OutHeaderMagic, 0, command_result.GetValue(), 0};
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return ResultSuccess();
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}
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#endif
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}
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