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>>>>> tag v1.26.5+1 for changeset b74429b0f5c4
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 17:17:30 +0200
parents b50eed0cc0ef
children
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1 /* Copyright 2013 Google Inc. All Rights Reserved.
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3 Distributed under MIT license.
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4 See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
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5 */
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7 /* Functions to estimate the bit cost of Huffman trees. */
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9 #ifndef BROTLI_ENC_BIT_COST_H_
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10 #define BROTLI_ENC_BIT_COST_H_
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12 #include <brotli/types.h>
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14 #include "../common/platform.h"
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15 #include "fast_log.h"
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16 #include "histogram.h"
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18 #if defined(__cplusplus) || defined(c_plusplus)
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19 extern "C" {
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20 #endif
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22 static BROTLI_INLINE double ShannonEntropy(
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23 const uint32_t* population, size_t size, size_t* total) {
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24 size_t sum = 0;
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25 double retval = 0;
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26 const uint32_t* population_end = population + size;
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27 size_t p;
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28 if (size & 1) {
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29 goto odd_number_of_elements_left;
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30 }
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31 while (population < population_end) {
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32 p = *population++;
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33 sum += p;
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34 retval -= (double)p * FastLog2(p);
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35 odd_number_of_elements_left:
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36 p = *population++;
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37 sum += p;
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38 retval -= (double)p * FastLog2(p);
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39 }
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40 if (sum) retval += (double)sum * FastLog2(sum);
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41 *total = sum;
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42 return retval;
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43 }
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45 static BROTLI_INLINE double BitsEntropy(
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46 const uint32_t* population, size_t size) {
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47 size_t sum;
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48 double retval = ShannonEntropy(population, size, &sum);
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49 if (retval < (double)sum) {
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50 /* At least one bit per literal is needed. */
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51 retval = (double)sum;
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52 }
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53 return retval;
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54 }
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56 BROTLI_INTERNAL double BrotliPopulationCostLiteral(const HistogramLiteral*);
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57 BROTLI_INTERNAL double BrotliPopulationCostCommand(const HistogramCommand*);
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58 BROTLI_INTERNAL double BrotliPopulationCostDistance(const HistogramDistance*);
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60 #if defined(__cplusplus) || defined(c_plusplus)
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61 } /* extern "C" */
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62 #endif
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64 #endif /* BROTLI_ENC_BIT_COST_H_ */