67 lines
2.0 KiB
C++
67 lines
2.0 KiB
C++
/*
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* Copyright 2021 Google LLC
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* 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, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "encoder.h"
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#include <cstdint>
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#include <string>
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#include <vector>
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#include "varint.h"
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namespace dist_proc {
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namespace aggregation {
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namespace encoding {
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inline Encoder::Encoder(void* b, size_t maxn)
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: buf_(reinterpret_cast<unsigned char*>(b)),
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limit_(reinterpret_cast<unsigned char*>(b) + maxn),
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orig_(reinterpret_cast<unsigned char*>(b)) {
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}
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inline size_t Encoder::length() const {
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assert(buf_ >= orig_);
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assert(buf_ <= limit_);
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if (buf_ <= limit_) {
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// suppress unused private field warning
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}
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return buf_ - orig_;
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}
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inline void Encoder::put_varint64(uint64_t v) {
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buf_ = reinterpret_cast<unsigned char*>(Varint::Encode64(reinterpret_cast<char*>(buf_), v));
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}
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void Encoder::AppendToString(const int64_t src, std::string* dst) {
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char buf[kMaxLength];
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Encoder enc(buf, kMaxLength);
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assert(Varint::Length64(src) <= kMaxLength);
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// We encode int64s as uint64s.
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enc.put_varint64(static_cast<uint64_t>(src));
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dst->append(enc.base(), enc.length());
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}
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void Encoder::SerializeToPackedStringAll(std::vector<int64_t>::const_iterator begin,
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std::vector<int64_t>::const_iterator end,
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std::string* dst) {
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dst->clear();
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for (; begin != end; ++begin) {
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Encoder::AppendToString(*begin, dst);
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}
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}
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} // namespace encoding
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} // namespace aggregation
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} // namespace dist_proc
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