| /******************************************************************************* |
| * Copyright 2014 Trevor Robinson |
| * |
| * 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 "int_types.h" |
| |
| bool crc32c_initialize(); |
| |
| class chunk_config { |
| public: |
| enum { |
| min_words = 4 |
| }; |
| |
| const size_t words; |
| const chunk_config* const next; |
| uint32_t shift1[256]; |
| uint32_t shift2[256]; |
| |
| chunk_config(size_t words, const chunk_config* next = 0); |
| |
| size_t loops() const { |
| return (words - 1) / 3; |
| } |
| size_t extra() const { |
| return (words - 1) % 3 + 1; |
| } |
| |
| private: |
| chunk_config& operator=(const chunk_config&); |
| |
| static void make_shift_table(size_t bytes, uint32_t table[256]); |
| }; |
| |
| uint32_t crc32c(uint32_t init, const void *buf, size_t len, const chunk_config* config); |