1 /*
2 * Copyright (C) 2016 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 "protobuf.h"
18
19 uint8_t*
write_raw_varint(uint8_t * buf,uint32_t val)20 write_raw_varint(uint8_t* buf, uint32_t val)
21 {
22 uint8_t* p = buf;
23 while (true) {
24 if ((val & ~0x7F) == 0) {
25 *p++ = (uint8_t)val;
26 return p;
27 } else {
28 *p++ = (uint8_t)((val & 0x7F) | 0x80);
29 val >>= 7;
30 }
31 }
32 }
33
34 uint8_t*
write_length_delimited_tag_header(uint8_t * buf,uint32_t fieldId,size_t size)35 write_length_delimited_tag_header(uint8_t* buf, uint32_t fieldId, size_t size)
36 {
37 buf = write_raw_varint(buf, (fieldId << 3) | 2);
38 buf = write_raw_varint(buf, size);
39 return buf;
40 }
41
42