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legacy_reflection.cpp
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legacy_reflection.cpp
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/*
* Copyright 2016-present Facebook, Inc.
*
* 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 <thrift/lib/cpp2/reflection/legacy_reflection.h>
#include <folly/Format.h>
#include <folly/lang/Bits.h>
#include <folly/ssl/OpenSSLHash.h>
namespace apache {
namespace thrift {
namespace legacy_reflection_detail {
id_t get_type_id(type_t type, folly::StringPiece name) {
union {
id_t val;
std::uint8_t buf[20];
} hash;
folly::ssl::OpenSSLHash::sha1(folly::range(hash.buf), name);
const auto truncated = folly::Endian::little(hash.val);
constexpr auto kTypeBits = 5;
constexpr auto kTypeMask = (id_t(1) << kTypeBits) - 1;
return (truncated & ~kTypeMask) | id_t(type);
}
} // namespace legacy_reflection_detail
} // namespace thrift
} // namespace apache