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rocksdb/thrift/lib/cpp/util/VarintUtils.tcc

63 lines
1.8 KiB

/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 "folly/experimental/io/Cursor.h"
namespace apache { namespace thrift {
namespace util {
template <class T, class CursorT,
typename std::enable_if<
std::is_constructible<folly::io::Cursor, const CursorT&>::value,
bool>::type = false>
T readVarint(CursorT& c) {
T retVal = 0;
uint8_t shift = 0;
uint8_t rsize = 0;
while (true) {
uint8_t byte;
c.pull(&byte, sizeof(byte));
rsize++;
retVal |= (uint64_t)(byte & 0x7f) << shift;
shift += 7;
if (!(byte & 0x80)) {
return retVal;
}
if (rsize > sizeof(T)) {
// Too big for return type
throw std::out_of_range("invalid varint read");
}
}
}
template <class T>
void writeVarint(folly::io::RWPrivateCursor& c, T value) {
while (true) {
if ((value & ~0x7F) == 0) {
c.write<uint8_t>((int8_t)value);
break;
} else {
c.write<uint8_t>((int8_t)((value & 0x7F) | 0x80));
value = (unsigned)value >> 7;
}
}
}
}}} // apache::thrift::util