| /* |
| * |
| * 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; |
| } |