| /* |
| * |
| * Copyright 2015, Google Inc. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following disclaimer |
| * in the documentation and/or other materials provided with the |
| * distribution. |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| * |
| */ |
| |
| #include "src/core/transport/chttp2/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] = (uint8_t)((tail_value >> 28) | 0x80); |
| case 4: |
| target[3] = (uint8_t)((tail_value >> 21) | 0x80); |
| case 3: |
| target[2] = (uint8_t)((tail_value >> 14) | 0x80); |
| case 2: |
| target[1] = (uint8_t)((tail_value >> 7) | 0x80); |
| case 1: |
| target[0] = (uint8_t)((tail_value) | 0x80); |
| } |
| target[tail_length - 1] &= 0x7f; |
| } |