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 #include <cstdint>
21
22 #include "chre/platform/shared/generated/host_messages_generated.h"
23
24 using flatbuffers::FlatBufferBuilder;
25 using flatbuffers::Offset;
26 using flatbuffers::Vector;
27
28 namespace chre {
29
encodeNanoappMessage(FlatBufferBuilder & builder,uint64_t appId,uint32_t messageType,uint16_t hostEndpoint,const void * messageData,size_t messageDataLen,uint32_t permissions,uint32_t messagePermissions,bool wokeHost,bool isReliable,uint32_t messageSequenceNumber)30 void HostProtocolCommon::encodeNanoappMessage(
31 FlatBufferBuilder &builder, uint64_t appId, uint32_t messageType,
32 uint16_t hostEndpoint, const void *messageData, size_t messageDataLen,
33 uint32_t permissions, uint32_t messagePermissions, bool wokeHost,
34 bool isReliable, uint32_t messageSequenceNumber) {
35 auto messageDataOffset = builder.CreateVector(
36 static_cast<const uint8_t *>(messageData), messageDataLen);
37
38 auto nanoappMessage = fbs::CreateNanoappMessage(
39 builder, appId, messageType, hostEndpoint, messageDataOffset,
40 messagePermissions, permissions, wokeHost, isReliable,
41 messageSequenceNumber);
42 finalize(builder, fbs::ChreMessage::NanoappMessage, nanoappMessage.Union());
43 }
44
encodeMessageDeliveryStatus(FlatBufferBuilder & builder,uint32_t messageSequenceNumber,uint8_t errorCode)45 void HostProtocolCommon::encodeMessageDeliveryStatus(
46 FlatBufferBuilder &builder, uint32_t messageSequenceNumber,
47 uint8_t errorCode) {
48 auto status = fbs::CreateMessageDeliveryStatus(builder, messageSequenceNumber,
49 errorCode);
50 finalize(builder, fbs::ChreMessage::MessageDeliveryStatus, status.Union());
51 }
52
addStringAsByteVector(FlatBufferBuilder & builder,const char * str)53 Offset<Vector<int8_t>> HostProtocolCommon::addStringAsByteVector(
54 FlatBufferBuilder &builder, const char *str) {
55 return builder.CreateVector(reinterpret_cast<const int8_t *>(str),
56 strlen(str) + 1);
57 }
58
finalize(FlatBufferBuilder & builder,fbs::ChreMessage messageType,flatbuffers::Offset<void> message,uint16_t hostClientId)59 void HostProtocolCommon::finalize(FlatBufferBuilder &builder,
60 fbs::ChreMessage messageType,
61 flatbuffers::Offset<void> message,
62 uint16_t hostClientId) {
63 fbs::HostAddress hostAddr(hostClientId);
64 auto container =
65 fbs::CreateMessageContainer(builder, messageType, message, &hostAddr);
66 builder.Finish(container);
67 }
68
verifyMessage(const void * message,size_t messageLen)69 bool HostProtocolCommon::verifyMessage(const void *message, size_t messageLen) {
70 bool valid = false;
71
72 if (message != nullptr) {
73 flatbuffers::Verifier verifier(static_cast<const uint8_t *>(message),
74 messageLen);
75
76 valid = fbs::VerifyMessageContainerBuffer(verifier);
77 }
78
79 return valid;
80 }
81
82 } // namespace chre
83