| // Copyright 2022 The Abseil 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 |
| // |
| // https://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. |
| |
| #ifndef ABSL_CRC_INTERNAL_CRC32C_H_ |
| #define ABSL_CRC_INTERNAL_CRC32C_H_ |
| |
| #include "absl/base/config.h" |
| #include "absl/crc/crc32c.h" |
| |
| namespace absl { |
| ABSL_NAMESPACE_BEGIN |
| namespace crc_internal { |
| |
| // Modifies a CRC32 value by removing `length` bytes with a value of 0 from |
| // the end of the string. |
| // |
| // This is the inverse operation of ExtendCrc32cByZeroes(). |
| // |
| // This operation has a runtime cost of O(log(`length`)) |
| // |
| // Internal implementation detail, exposed for testing only. |
| crc32c_t UnextendCrc32cByZeroes(crc32c_t initial_crc, size_t length); |
| |
| } // namespace crc_internal |
| ABSL_NAMESPACE_END |
| } // namespace absl |
| |
| #endif // ABSL_CRC_INTERNAL_CRC32C_H_ |
