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 <android/util/protobuf.h> 18 19 namespace android { 20 namespace util { 21 22 uint8_t 23 read_wire_type(uint32_t varint) 24 { 25 return (uint8_t) (varint & WIRE_TYPE_MASK); 26 } 27 28 uint32_t 29 read_field_id(uint32_t varint) 30 { 31 return varint >> FIELD_ID_SHIFT; 32 } 33 34 size_t 35 get_varint_size(uint64_t varint) 36 { 37 size_t size = 1; 38 while ((varint & ~0x7F)) { 39 size++; 40 varint >>= 7; 41 } 42 return size; 43 } 44 45 uint8_t* 46 write_raw_varint(uint8_t* buf, uint64_t val) 47 { 48 uint8_t* p = buf; 49 while (true) { 50 if ((val & ~0x7F) == 0) { 51 *p++ = (uint8_t)val; 52 return p; 53 } else { 54 *p++ = (uint8_t)((val & 0x7F) | 0x80); 55 val >>= 7; 56 } 57 } 58 } 59 60 uint8_t* 61 write_length_delimited_tag_header(uint8_t* buf, uint32_t fieldId, size_t size) 62 { 63 buf = write_raw_varint(buf, (fieldId << FIELD_ID_SHIFT) | WIRE_TYPE_LENGTH_DELIMITED); 64 buf = write_raw_varint(buf, size); 65 return buf; 66 } 67 68 } // util 69 } // android 70
