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43 lines
1.5 KiB
C
43 lines
1.5 KiB
C
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/*
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Copyright 2011 Google Inc. All Rights Reserved.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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Author: lode.vandevenne@gmail.com (Lode Vandevenne)
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Author: jyrki.alakuijala@gmail.com (Jyrki Alakuijala)
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*/
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#ifndef ZOPFLI_KATAJAINEN_H_
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#define ZOPFLI_KATAJAINEN_H_
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#include <string.h>
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/*
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Outputs minimum-redundancy length-limited code bitlengths for symbols with the
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given counts. The bitlengths are limited by maxbits.
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The output is tailored for DEFLATE: symbols that never occur, get a bit length
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of 0, and if only a single symbol occurs at least once, its bitlength will be 1,
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and not 0 as would theoretically be needed for a single symbol.
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frequencies: The amount of occurrences of each symbol.
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n: The amount of symbols.
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maxbits: Maximum bit length, inclusive.
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bitlengths: Output, the bitlengths for the symbol prefix codes.
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return: 0 for OK, non-0 for error.
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*/
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int ZopfliLengthLimitedCodeLengths(
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const size_t* frequencies, int n, int maxbits, unsigned* bitlengths);
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#endif /* ZOPFLI_KATAJAINEN_H_ */
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