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/*
* Copyright (C) 2016 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <android/util/protobuf.h>
namespace android {
namespace util {
uint8_t
read_wire_type(uint32_t varint)
{
return (uint8_t) (varint & WIRE_TYPE_MASK);
}
uint32_t
read_field_id(uint32_t varint)
{
return varint >> FIELD_ID_SHIFT;
}
size_t
get_varint_size(uint64_t varint)
{
size_t size = 1;
while ((varint & ~0x7F)) {
size++;
varint >>= 7;
}
return size;
}
uint8_t*
write_raw_varint(uint8_t* buf, uint64_t val)
{
uint8_t* p = buf;
while (true) {
if ((val & ~0x7F) == 0) {
*p++ = (uint8_t)val;
return p;
} else {
*p++ = (uint8_t)((val & 0x7F) | 0x80);
val >>= 7;
}
}
}
uint8_t*
write_length_delimited_tag_header(uint8_t* buf, uint32_t fieldId, size_t size)
{
buf = write_raw_varint(buf, (fieldId << FIELD_ID_SHIFT) | WIRE_TYPE_LENGTH_DELIMITED);
buf = write_raw_varint(buf, size);
return buf;
}
} // util
} // android
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