| // Copyright 2013 Google Inc. All Rights Reserved. |
| // |
| // 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. |
| // |
| // Functions for encoding of integers into prefix codes the amount of extra |
| // bits, and the actual values of the extra bits. |
| |
| #ifndef BROTLI_ENC_PREFIX_H_ |
| #define BROTLI_ENC_PREFIX_H_ |
| |
| #include <stdint.h> |
| |
| namespace brotli { |
| |
| static const int kNumInsertLenPrefixes = 24; |
| static const int kNumCopyLenPrefixes = 24; |
| static const int kNumCommandPrefixes = 704; |
| static const int kNumBlockLenPrefixes = 26; |
| static const int kNumDistanceShortCodes = 16; |
| static const int kNumDistancePrefixes = 520; |
| |
| int CommandPrefix(int insert_length, int copy_length); |
| int InsertLengthExtraBits(int prefix); |
| int InsertLengthOffset(int prefix); |
| int CopyLengthExtraBits(int prefix); |
| int CopyLengthOffset(int prefix); |
| |
| void PrefixEncodeCopyDistance(int distance_code, |
| int num_direct_codes, |
| int shift_bits, |
| uint16_t* prefix, |
| int* nbits, |
| uint32_t* extra_bits); |
| |
| int BlockLengthPrefix(int length); |
| int BlockLengthExtraBits(int prefix); |
| int BlockLengthOffset(int prefix); |
| |
| } // namespace brotli |
| |
| #endif // BROTLI_ENC_PREFIX_H_ |