64 lines
1.8 KiB
Plaintext
64 lines
1.8 KiB
Plaintext
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/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*/
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#include "folly/experimental/io/Cursor.h"
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namespace apache { namespace thrift {
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namespace util {
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template <class T, class CursorT,
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typename std::enable_if<
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std::is_constructible<folly::io::Cursor, const CursorT&>::value,
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bool>::type = false>
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T readVarint(CursorT& c) {
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T retVal = 0;
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uint8_t shift = 0;
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uint8_t rsize = 0;
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while (true) {
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uint8_t byte;
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c.pull(&byte, sizeof(byte));
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rsize++;
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retVal |= (uint64_t)(byte & 0x7f) << shift;
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shift += 7;
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if (!(byte & 0x80)) {
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return retVal;
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}
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if (rsize > sizeof(T)) {
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// Too big for return type
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throw std::out_of_range("invalid varint read");
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}
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}
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}
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template <class T>
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void writeVarint(folly::io::RWPrivateCursor& c, T value) {
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while (true) {
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if ((value & ~0x7F) == 0) {
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c.write<uint8_t>((int8_t)value);
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break;
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} else {
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c.write<uint8_t>((int8_t)((value & 0x7F) | 0x80));
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value = (unsigned)value >> 7;
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}
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}
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}
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}}} // apache::thrift::util
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