1// Copyright 2013 Google Inc. All Rights Reserved. 2// 3// Licensed under the Apache License, Version 2.0 (the "License"); 4// you may not use this file except in compliance with the License. 5// You may obtain a copy of the License at 6// 7// http://www.apache.org/licenses/LICENSE-2.0 8// 9// Unless required by applicable law or agreed to in writing, software 10// distributed under the License is distributed on an "AS IS" BASIS, 11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12// See the License for the specific language governing permissions and 13// limitations under the License. 14// 15// This class models a sequence of literals and a backward reference copy. 16 17#ifndef BROTLI_ENC_COMMAND_H_ 18#define BROTLI_ENC_COMMAND_H_ 19 20#include <stdint.h> 21 22namespace brotli { 23 24// Command holds a sequence of literals and a backward reference copy. 25class Command { 26 public: 27 // distance_code_ is initialized to 17 because it refers to the distance 28 // code of a backward distance of 1, this way the last insert-only command 29 // won't use the last-distance short code, and accordingly distance_prefix_ is 30 // set to 16 31 Command() : insert_length_(0), copy_length_(0), copy_length_code_(0), 32 copy_distance_(0), distance_code_(17), 33 distance_prefix_(16), command_prefix_(0), 34 distance_extra_bits_(0), distance_extra_bits_value_(0) {} 35 36 uint32_t insert_length_; 37 uint32_t copy_length_; 38 uint32_t copy_length_code_; 39 uint32_t copy_distance_; 40 // Values <= 16 are short codes, values > 16 are distances shifted by 16. 41 uint32_t distance_code_; 42 uint16_t distance_prefix_; 43 uint16_t command_prefix_; 44 int distance_extra_bits_; 45 uint32_t distance_extra_bits_value_; 46}; 47 48} // namespace brotli 49 50#endif // BROTLI_ENC_COMMAND_H_ 51