text: /*
   *
   * Copyright 2015 gRPC authors.
   *
   * 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 <grpc/support/port_platform.h>
  
  #include "src/core/ext/transport/chttp2/transport/varint.h"
  
  uint32_t grpc_chttp2_hpack_varint_length(uint32_t tail_value) {
    if (tail_value < (1 << 7)) {
      return 2;
    } else if (tail_value < (1 << 14)) {
      return 3;
    } else if (tail_value < (1 << 21)) {
      return 4;
    } else if (tail_value < (1 << 28)) {
      return 5;
    } else {
      return 6;
    }
  }
  
  void grpc_chttp2_hpack_write_varint_tail(uint32_t tail_value, uint8_t* target,
                                           uint32_t tail_length) {
    switch (tail_length) {
      case 5:
        target[4] = static_cast<uint8_t>((tail_value >> 28) | 0x80);
      /* fallthrough */
      case 4:
        target[3] = static_cast<uint8_t>((tail_value >> 21) | 0x80);
      /* fallthrough */
      case 3:
        target[2] = static_cast<uint8_t>((tail_value >> 14) | 0x80);
      /* fallthrough */
      case 2:
        target[1] = static_cast<uint8_t>((tail_value >> 7) | 0x80);
      /* fallthrough */
      case 1:
        target[0] = static_cast<uint8_t>((tail_value) | 0x80);
    }
    target[tail_length - 1] &= 0x7f;
  }
  