1/*
2 * Copyright (C) 2017 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include "chre/platform/shared/host_protocol_chre.h"
18
19#include <inttypes.h>
20#include <string.h>
21
22#include "chre/platform/log.h"
23#include "chre/platform/shared/host_messages_generated.h"
24
25using flatbuffers::FlatBufferBuilder;
26using flatbuffers::Offset;
27using flatbuffers::Vector;
28
29namespace chre {
30
31bool HostProtocolChre::decodeMessageFromHost(const void *message,
32                                             size_t messageLen) {
33  bool success = verifyMessage(message, messageLen);
34  if (!success) {
35    LOGE("Dropping invalid/corrupted message from host (length %zu)",
36         messageLen);
37  } else {
38    const fbs::MessageContainer *container = fbs::GetMessageContainer(message);
39    uint16_t hostClientId = container->host_addr()->client_id();
40
41    switch (container->message_type()) {
42      case fbs::ChreMessage::NanoappMessage: {
43        const auto *nanoappMsg = static_cast<const fbs::NanoappMessage *>(
44            container->message());
45        // Required field; verifier ensures that this is not null (though it
46        // may be empty)
47        const flatbuffers::Vector<uint8_t> *msgData = nanoappMsg->message();
48        HostMessageHandlers::handleNanoappMessage(
49            nanoappMsg->app_id(), nanoappMsg->message_type(),
50            nanoappMsg->host_endpoint(), msgData->data(), msgData->size());
51        break;
52      }
53
54      case fbs::ChreMessage::HubInfoRequest:
55        HostMessageHandlers::handleHubInfoRequest(hostClientId);
56        break;
57
58      case fbs::ChreMessage::NanoappListRequest:
59        HostMessageHandlers::handleNanoappListRequest(hostClientId);
60        break;
61
62      case fbs::ChreMessage::LoadNanoappRequest: {
63        const auto *request = static_cast<const fbs::LoadNanoappRequest *>(
64            container->message());
65        const flatbuffers::Vector<uint8_t> *appBinary = request->app_binary();
66        HostMessageHandlers::handleLoadNanoappRequest(
67            hostClientId, request->transaction_id(), request->app_id(),
68            request->app_version(), request->target_api_version(),
69            appBinary->data(), appBinary->size());
70        break;
71      }
72
73      default:
74        LOGW("Got invalid/unexpected message type %" PRIu8,
75             static_cast<uint8_t>(container->message_type()));
76        success = false;
77    }
78  }
79
80  return success;
81}
82
83void HostProtocolChre::encodeHubInfoResponse(
84    FlatBufferBuilder& builder, const char *name, const char *vendor,
85    const char *toolchain, uint32_t legacyPlatformVersion,
86    uint32_t legacyToolchainVersion, float peakMips, float stoppedPower,
87    float sleepPower, float peakPower, uint32_t maxMessageLen,
88    uint64_t platformId, uint32_t version, uint16_t hostClientId) {
89  auto nameOffset = addStringAsByteVector(builder, name);
90  auto vendorOffset = addStringAsByteVector(builder, vendor);
91  auto toolchainOffset = addStringAsByteVector(builder, toolchain);
92
93  auto response = fbs::CreateHubInfoResponse(
94      builder, nameOffset, vendorOffset, toolchainOffset, legacyPlatformVersion,
95      legacyToolchainVersion, peakMips, stoppedPower, sleepPower, peakPower,
96      maxMessageLen, platformId, version);
97  finalize(builder, fbs::ChreMessage::HubInfoResponse, response.Union(),
98           hostClientId);
99}
100
101void HostProtocolChre::addNanoappListEntry(
102    FlatBufferBuilder& builder,
103    DynamicVector<Offset<fbs::NanoappListEntry>>& offsetVector,
104    uint64_t appId, uint32_t appVersion, bool enabled, bool isSystemNanoapp) {
105  auto offset = fbs::CreateNanoappListEntry(
106      builder, appId, appVersion, enabled, isSystemNanoapp);
107  if (!offsetVector.push_back(offset)) {
108    LOGE("Couldn't push nanoapp list entry offset!");
109  }
110}
111
112void HostProtocolChre::finishNanoappListResponse(
113    FlatBufferBuilder& builder,
114    DynamicVector<Offset<fbs::NanoappListEntry>>& offsetVector,
115    uint16_t hostClientId) {
116  auto vectorOffset = builder.CreateVector<Offset<fbs::NanoappListEntry>>(
117      offsetVector);
118  auto response = fbs::CreateNanoappListResponse(builder, vectorOffset);
119  finalize(builder, fbs::ChreMessage::NanoappListResponse, response.Union(),
120           hostClientId);
121}
122
123void HostProtocolChre::encodeLoadNanoappResponse(
124    flatbuffers::FlatBufferBuilder& builder, uint16_t hostClientId,
125    uint32_t transactionId, bool success) {
126  auto response = fbs::CreateLoadNanoappResponse(builder, transactionId,
127                                                 success);
128  finalize(builder, fbs::ChreMessage::LoadNanoappResponse, response.Union(),
129           hostClientId);
130}
131
132}  // namespace chre
133