1 /******************************************************************************
2  *
3  *  Copyright (C) 2022 Google, Inc.
4  *
5  *  Licensed under the Apache License, Version 2.0 (the "License");
6  *  you may not use this file except in compliance with the License.
7  *  You may obtain a copy of the License at:
8  *
9  *  http://www.apache.org/licenses/LICENSE-2.0
10  *
11  *  Unless required by applicable law or agreed to in writing, software
12  *  distributed under the License is distributed on an "AS IS" BASIS,
13  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  *  See the License for the specific language governing permissions and
15  *  limitations under the License.
16  *
17  ******************************************************************************/
18 
19 namespace bluetooth {
20 namespace hal {
21 
22 constexpr uint32_t kBytesToTest = 0x12345678;
23 constexpr uint8_t kFirstByte = (const uint8_t&)kBytesToTest;
24 constexpr bool isLittleEndian = kFirstByte == 0x78;
25 constexpr bool isBigEndian = kFirstByte == 0x12;
26 static_assert((isLittleEndian || isBigEndian) && (isLittleEndian != isBigEndian));
27 
28 constexpr uint32_t BTSNOOP_VERSION_NUMBER = isLittleEndian ? 0x01000000 : 1;
29 constexpr uint32_t BTSNOOP_DATALINK_TYPE =
30     isLittleEndian ? 0xea030000 : 0x03ea;  // Datalink Type code for HCI UART (H4) is 1002
31 
32 class SnoopLoggerCommon {
33  public:
34   struct FileHeaderType {
35     uint8_t identification_pattern[8];
36     uint32_t version_number;
37     uint32_t datalink_type;
38   } __attribute__((__packed__));
39 
40   static constexpr FileHeaderType kBtSnoopFileHeader = {
41       .identification_pattern = {'b', 't', 's', 'n', 'o', 'o', 'p', 0x00},
42       .version_number = BTSNOOP_VERSION_NUMBER,
43       .datalink_type = BTSNOOP_DATALINK_TYPE};
44 };
45 
46 }  // namespace hal
47 }  // namespace bluetooth
48