YugabyteDB (2.13.1.0-b60, 21121d69985fbf76aa6958d8f04a9bfa936293b5)

//  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.

//  This source code is licensed under the BSD-style license found in the

//  LICENSE file in the root directory of this source tree. An additional grant

//  of patent rights can be found in the PATENTS file in the same directory.

//

// The following only applies to changes made to this file as part of YugaByte development.

//

// Portions Copyright (c) YugaByte, 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.

//

// Copyright (c) 2011 The LevelDB Authors. All rights reserved.

// Use of this source code is governed by a BSD-style license that can be

// found in the LICENSE file. See the AUTHORS file for names of contributors.

#include "yb/rocksdb/util/coding.h"

#include <algorithm>

#include "yb/util/slice.h"

namespace rocksdb {

char* EncodeVarint32(char* dst, uint32_t v) {

  // Operate on characters as unsigneds

  unsigned char* ptr = reinterpret_cast<unsigned char*>(dst);

  static const int B = 128;

  if (v < (1 << 7)) {

    *(ptr++) = v;

  } else 
if (49.9M
v < (1 << 14)49.9M
) {

    *(ptr++) = v | B;

    *(ptr++) = v >> 7;

  } else 
if (29.2k
v < (1 << 21)29.2k
) {

    *(ptr++) = v | B;

    *(ptr++) = (v >> 7) | B;

    *(ptr++) = v >> 14;

  } else if (v < (1 << 28)) {

    *(ptr++) = v | B;

    *(ptr++) = (v >> 7) | B;

    *(ptr++) = (v >> 14) | B;

    *(ptr++) = v >> 21;

  } else {

    *(ptr++) = v | B;

    *(ptr++) = (v >> 7) | B;

    *(ptr++) = (v >> 14) | B;

    *(ptr++) = (v >> 21) | B;

    *(ptr++) = v >> 28;

  }

  return reinterpret_cast<char*>(ptr);

}

const char* GetVarint32PtrFallback(const char* p, const char* limit,

                                   uint32_t* value) {

  uint32_t result = 0;

  for (uint32_t shift = 0; shift <= 28 && 
p < limit678M
; 
shift += 7340M
) {

    uint32_t byte = *(reinterpret_cast<const unsigned char*>(p));

    p++;

    if (byte & 128) {

      // More bytes are present

      result |= ((byte & 127) << shift);

    } else {

      result |= (byte << shift);

      *value = result;

      return reinterpret_cast<const char*>(p);

    }

  }

  return nullptr;

}

const char* GetVarint64PtrFallback(const char* p, const char* limit, uint64_t* value) {

  uint64_t result = 0;

  for (uint32_t shift = 0; shift <= 63 && 
p < limit343M
; 
shift += 7209M
) {

    uint64_t byte = *(reinterpret_cast<const unsigned char*>(p));

    p++;

    if (byte & 128) {

      // More bytes are present

      result |= ((byte & 127) << shift);

    } else {

      result |= (byte << shift);

      *value = result;

      return reinterpret_cast<const char*>(p);

    }

  }

  return nullptr;

}

}  // namespace rocksdb