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/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/db/ftdc/varint.h"
#include <third_party/s2/util/coding/varint.h>
#include "mongo/util/assert_util.h"
namespace mongo {
Status DataType::Handler<FTDCVarInt>::load(
FTDCVarInt* t, const char* ptr, size_t length, size_t* advanced, std::ptrdiff_t debug_offset) {
std::uint64_t value;
const char* newptr =
Varint::Parse64WithLimit(ptr, ptr + length, reinterpret_cast<uint64*>(&value));
if (!newptr) {
return DataType::makeTrivialLoadStatus(FTDCVarInt::kMaxSizeBytes64, length, debug_offset);
}
if (t) {
*t = value;
}
if (advanced) {
*advanced = newptr - ptr;
}
return Status::OK();
}
Status DataType::Handler<FTDCVarInt>::store(
const FTDCVarInt& t, char* ptr, size_t length, size_t* advanced, std::ptrdiff_t debug_offset) {
// nullptr means it wants to know how much space we want
if (!ptr) {
*advanced = FTDCVarInt::kMaxSizeBytes64;
return Status::OK();
}
if (FTDCVarInt::kMaxSizeBytes64 > length) {
return DataType::makeTrivialStoreStatus(FTDCVarInt::kMaxSizeBytes64, length, debug_offset);
}
// Use a dassert since static_assert does not work because the expression does not have a
// constant value
dassert(Varint::kMax64 == FTDCVarInt::kMaxSizeBytes64);
const char* newptr = Varint::Encode64(ptr, t);
if (advanced) {
*advanced = newptr - ptr;
}
return Status::OK();
}
} // namespace mongo
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