60 lines
1.8 KiB
C++
60 lines
1.8 KiB
C++
// 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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// This file is copied from
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// https://github.com/apache/impala/blob/branch-2.9.0/be/src/util/buffer-builder.hpp
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// and modified by Doris
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#pragma once
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#include <glog/loging.h>
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#include <stdlib.h>
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namespace doris {
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// Utility class to build an in-memory buffer.
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class BufferBuilder {
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public:
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BufferBuilder(uint8_t* dst_buffer, int dst_len)
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: _buffer(dst_buffer), _capacity(dst_len), _size(0) {}
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BufferBuilder(char* dst_buffer, int dst_len)
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: _buffer(reinterpret_cast<uint8_t*>(dst_buffer)), _capacity(dst_len), _size(0) {}
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~BufferBuilder() {}
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void append(const void* buffer, int len) {
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DCHECK_LE(_size + len, _capacity);
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memcpy(_buffer + _size, buffer, len);
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_size += len;
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}
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template <typename T>
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void append(const T& v) {
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append(&v, sizeof(T));
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}
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int capacity() const { return _capacity; }
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int size() const { return _size; }
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private:
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uint8_t* _buffer;
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int _capacity;
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int _size;
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};
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} // namespace doris
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