| /* |
| * Copyright (C) 2017 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include "chre_host/host_protocol_host.h" |
| |
| #include <inttypes.h> |
| #include <string.h> |
| |
| #include "chre_host/log.h" |
| |
| using flatbuffers::FlatBufferBuilder; |
| using flatbuffers::Offset; |
| |
| // Aliased for consistency with the way these symbols are referenced in |
| // CHRE-side code |
| namespace fbs = ::chre::fbs; |
| |
| namespace android { |
| namespace chre { |
| |
| namespace { |
| |
| /** |
| * Checks that a string encapsulated as a byte vector is null-terminated, and |
| * if it is, returns a pointer to the vector's data. Otherwise returns null. |
| * |
| * @param vec Target vector, can be null |
| * |
| * @return Pointer to the vector's data, or null |
| */ |
| const char *getStringFromByteVector(const flatbuffers::Vector<int8_t> *vec) { |
| constexpr int8_t kNullChar = 0; |
| const char *str = nullptr; |
| |
| // Check that the vector is present, non-empty, and null-terminated |
| if (vec != nullptr && vec->size() > 0 |
| && (*vec)[vec->size() - 1] == kNullChar) { |
| str = reinterpret_cast<const char *>(vec->data()); |
| } |
| |
| return str; |
| } |
| |
| } // anonymous namespace |
| |
| bool HostProtocolHost::decodeMessageFromChre( |
| const void *message, size_t messageLen, IChreMessageHandlers& handlers) { |
| bool success = verifyMessage(message, messageLen); |
| if (success) { |
| const fbs::MessageContainer *container = fbs::GetMessageContainer(message); |
| |
| switch (container->message_type()) { |
| case fbs::ChreMessage::NanoappMessage: { |
| const auto *nanoappMsg = static_cast<const fbs::NanoappMessage *>( |
| container->message()); |
| // Required field; verifier ensures that this is not null (though it |
| // may be empty) |
| const flatbuffers::Vector<uint8_t> *msgData = nanoappMsg->message(); |
| handlers.handleNanoappMessage( |
| nanoappMsg->app_id(), nanoappMsg->message_type(), |
| nanoappMsg->host_endpoint(), msgData->data(), msgData->size()); |
| break; |
| } |
| |
| case fbs::ChreMessage::HubInfoResponse: { |
| const auto *resp = static_cast<const fbs::HubInfoResponse *>( |
| container->message()); |
| |
| const char *name = getStringFromByteVector(resp->name()); |
| const char *vendor = getStringFromByteVector(resp->vendor()); |
| const char *toolchain = getStringFromByteVector(resp->toolchain()); |
| |
| handlers.handleHubInfoResponse( |
| name, vendor, toolchain, resp->platform_version(), |
| resp->toolchain_version(), resp->peak_mips(), resp->stopped_power(), |
| resp->sleep_power(), resp->peak_power(), resp->max_msg_len(), |
| resp->platform_id(), resp->chre_platform_version()); |
| break; |
| } |
| |
| case fbs::ChreMessage::NanoappListResponse: { |
| const auto *resp = static_cast<const fbs::NanoappListResponse *>( |
| container->message()); |
| fbs::NanoappListResponseT response; |
| resp->UnPackTo(&response); |
| handlers.handleNanoappListResponse(response); |
| break; |
| } |
| |
| case fbs::ChreMessage::LoadNanoappResponse: { |
| const auto *resp = static_cast<const fbs::LoadNanoappResponse *>( |
| container->message()); |
| fbs::LoadNanoappResponseT response; |
| resp->UnPackTo(&response); |
| handlers.handleLoadNanoappResponse(response); |
| break; |
| } |
| |
| default: |
| LOGW("Got invalid/unexpected message type %" PRIu8, |
| static_cast<uint8_t>(container->message_type())); |
| success = false; |
| } |
| } |
| |
| return success; |
| } |
| |
| void HostProtocolHost::encodeHubInfoRequest(FlatBufferBuilder& builder) { |
| auto request = fbs::CreateHubInfoRequest(builder); |
| finalize(builder, fbs::ChreMessage::HubInfoRequest, request.Union()); |
| } |
| |
| void HostProtocolHost::encodeLoadNanoappRequest( |
| FlatBufferBuilder& builder, uint32_t transactionId, uint64_t appId, |
| uint32_t appVersion, uint32_t targetApiVersion, |
| const std::vector<uint8_t>& nanoappBinary) { |
| auto appBinary = builder.CreateVector(nanoappBinary); |
| auto request = fbs::CreateLoadNanoappRequest( |
| builder, transactionId, appId, appVersion, targetApiVersion, appBinary); |
| finalize(builder, fbs::ChreMessage::LoadNanoappRequest, request.Union()); |
| } |
| |
| void HostProtocolHost::encodeNanoappListRequest(FlatBufferBuilder& builder) { |
| auto request = fbs::CreateNanoappListRequest(builder); |
| finalize(builder, fbs::ChreMessage::NanoappListRequest, request.Union()); |
| } |
| |
| bool HostProtocolHost::extractHostClientId(const void *message, |
| size_t messageLen, |
| uint16_t *hostClientId) { |
| bool success = verifyMessage(message, messageLen); |
| |
| if (success && hostClientId != nullptr) { |
| const fbs::MessageContainer *container = fbs::GetMessageContainer(message); |
| // host_addr guaranteed to be non-null via verifyMessage (it's a required |
| // field) |
| *hostClientId = container->host_addr()->client_id(); |
| success = true; |
| } |
| |
| return success; |
| } |
| |
| bool HostProtocolHost::mutateHostClientId(void *message, size_t messageLen, |
| uint16_t hostClientId) { |
| bool success = verifyMessage(message, messageLen); |
| |
| if (!success) { |
| LOGE("Message verification failed - can't mutate host ID"); |
| } else { |
| fbs::MessageContainer *container = fbs::GetMutableMessageContainer(message); |
| // host_addr guaranteed to be non-null via verifyMessage (it's a required |
| // field) |
| container->mutable_host_addr()->mutate_client_id(hostClientId); |
| success = true; |
| } |
| |
| return success; |
| } |
| |
| } // namespace chre |
| } // namespace android |