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c66e4e3e4f
This commit is for the encoder for brotli compression format. Brotli is a generic byte-level compression algorithm.
52 lines
1.7 KiB
C++
52 lines
1.7 KiB
C++
// Copyright 2013 Google Inc. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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// Functions for encoding of integers into prefix codes the amount of extra
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// bits, and the actual values of the extra bits.
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#ifndef BROTLI_ENC_PREFIX_H_
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#define BROTLI_ENC_PREFIX_H_
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#include <stdint.h>
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namespace brotli {
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static const int kNumInsertLenPrefixes = 24;
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static const int kNumCopyLenPrefixes = 24;
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static const int kNumCommandPrefixes = 704;
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static const int kNumBlockLenPrefixes = 26;
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static const int kNumDistanceShortCodes = 16;
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static const int kNumDistancePrefixes = 520;
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int CommandPrefix(int insert_length, int copy_length);
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int InsertLengthExtraBits(int prefix);
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int InsertLengthOffset(int prefix);
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int CopyLengthExtraBits(int prefix);
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int CopyLengthOffset(int prefix);
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void PrefixEncodeCopyDistance(int distance_code,
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int num_direct_codes,
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int shift_bits,
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uint16_t* prefix,
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int* nbits,
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uint32_t* extra_bits);
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int BlockLengthPrefix(int length);
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int BlockLengthExtraBits(int prefix);
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int BlockLengthOffset(int prefix);
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} // namespace brotli
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#endif // BROTLI_ENC_PREFIX_H_
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