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/generated/host_messages_generated.h"
22
23 using flatbuffers::FlatBufferBuilder;
24 using flatbuffers::Offset;
25 using flatbuffers::Vector;
26
27 namespace chre {
28
encodeNanoappMessage(FlatBufferBuilder & builder,uint64_t appId,uint32_t messageType,uint16_t hostEndpoint,const void * messageData,size_t messageDataLen,uint32_t permissions,uint32_t messagePermissions)29 void HostProtocolCommon::encodeNanoappMessage(
30 FlatBufferBuilder &builder, uint64_t appId, uint32_t messageType,
31 uint16_t hostEndpoint, const void *messageData, size_t messageDataLen,
32 uint32_t permissions, uint32_t messagePermissions) {
33 auto messageDataOffset = builder.CreateVector(
34 static_cast<const uint8_t *>(messageData), messageDataLen);
35
36 auto nanoappMessage = fbs::CreateNanoappMessage(
37 builder, appId, messageType, hostEndpoint, messageDataOffset,
38 messagePermissions, permissions);
39 finalize(builder, fbs::ChreMessage::NanoappMessage, nanoappMessage.Union());
40 }
41
addStringAsByteVector(FlatBufferBuilder & builder,const char * str)42 Offset<Vector<int8_t>> HostProtocolCommon::addStringAsByteVector(
43 FlatBufferBuilder &builder, const char *str) {
44 return builder.CreateVector(reinterpret_cast<const int8_t *>(str),
45 strlen(str) + 1);
46 }
47
finalize(FlatBufferBuilder & builder,fbs::ChreMessage messageType,flatbuffers::Offset<void> message,uint16_t hostClientId)48 void HostProtocolCommon::finalize(FlatBufferBuilder &builder,
49 fbs::ChreMessage messageType,
50 flatbuffers::Offset<void> message,
51 uint16_t hostClientId) {
52 fbs::HostAddress hostAddr(hostClientId);
53 auto container =
54 fbs::CreateMessageContainer(builder, messageType, message, &hostAddr);
55 builder.Finish(container);
56 }
57
verifyMessage(const void * message,size_t messageLen)58 bool HostProtocolCommon::verifyMessage(const void *message, size_t messageLen) {
59 bool valid = false;
60
61 if (message != nullptr) {
62 flatbuffers::Verifier verifier(static_cast<const uint8_t *>(message),
63 messageLen);
64
65 valid = fbs::VerifyMessageContainerBuffer(verifier);
66 }
67
68 return valid;
69 }
70
71 } // namespace chre
72