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_common.h"
18
19#include <string.h>
20
21#include "chre/platform/shared/host_messages_generated.h"
22
23using flatbuffers::FlatBufferBuilder;
24using flatbuffers::Offset;
25using flatbuffers::Vector;
26
27namespace chre {
28
29void HostProtocolCommon::encodeNanoappMessage(
30    FlatBufferBuilder& builder, uint64_t appId, uint32_t messageType,
31    uint16_t hostEndpoint, const void *messageData, size_t messageDataLen) {
32  auto messageDataOffset = builder.CreateVector(
33      static_cast<const uint8_t *>(messageData), messageDataLen);
34
35  auto nanoappMessage = fbs::CreateNanoappMessage(
36      builder, appId, messageType, hostEndpoint, messageDataOffset);
37  finalize(builder, fbs::ChreMessage::NanoappMessage, nanoappMessage.Union());
38}
39
40Offset<Vector<int8_t>> HostProtocolCommon::addStringAsByteVector(
41    FlatBufferBuilder& builder, const char *str) {
42  return builder.CreateVector(reinterpret_cast<const int8_t *>(str),
43                              strlen(str) + 1);
44}
45
46void HostProtocolCommon::finalize(
47    FlatBufferBuilder& builder, fbs::ChreMessage messageType,
48    flatbuffers::Offset<void> message, uint16_t hostClientId) {
49  fbs::HostAddress hostAddr(hostClientId);
50  auto container = fbs::CreateMessageContainer(
51      builder, messageType, message, &hostAddr);
52  builder.Finish(container);
53}
54
55bool HostProtocolCommon::verifyMessage(const void *message, size_t messageLen) {
56  bool valid = false;
57
58  if (message != nullptr) {
59    flatbuffers::Verifier verifier(static_cast<const uint8_t *>(message),
60                                   messageLen);
61
62    valid = fbs::VerifyMessageContainerBuffer(verifier);
63  }
64
65  return valid;
66}
67
68
69}  // namespace chre
70