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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 /* Collection of static dictionary words. */
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9 #ifndef BROTLI_COMMON_DICTIONARY_H_
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10 #define BROTLI_COMMON_DICTIONARY_H_
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12 #include <brotli/port.h>
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13 #include <brotli/types.h>
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15 #if defined(__cplusplus) || defined(c_plusplus)
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16 extern "C" {
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17 #endif
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19 typedef struct BrotliDictionary {
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20 /**
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21 * Number of bits to encode index of dictionary word in a bucket.
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22 *
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23 * Specification: Appendix A. Static Dictionary Data
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24 *
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25 * Words in a dictionary are bucketed by length.
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26 * @c 0 means that there are no words of a given length.
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27 * Dictionary consists of words with length of [4..24] bytes.
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28 * Values at [0..3] and [25..31] indices should not be addressed.
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29 */
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30 uint8_t size_bits_by_length[32];
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32 /* assert(offset[i + 1] == offset[i] + (bits[i] ? (i << bits[i]) : 0)) */
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33 uint32_t offsets_by_length[32];
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35 /* assert(data_size == offsets_by_length[31]) */
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36 size_t data_size;
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38 /* Data array is not bound, and should obey to size_bits_by_length values.
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39 Specified size matches default (RFC 7932) dictionary. Its size is
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40 defined by data_size */
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41 const uint8_t* data;
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42 } BrotliDictionary;
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44 BROTLI_COMMON_API const BrotliDictionary* BrotliGetDictionary(void);
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46 /**
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47 * Sets dictionary data.
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48 *
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49 * When dictionary data is already set / present, this method is no-op.
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50 *
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51 * Dictionary data MUST be provided before BrotliGetDictionary is invoked.
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52 * This method is used ONLY in multi-client environment (e.g. C + Java),
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53 * to reduce storage by sharing single dictionary between implementations.
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54 */
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55 BROTLI_COMMON_API void BrotliSetDictionaryData(const uint8_t* data);
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57 #define BROTLI_MIN_DICTIONARY_WORD_LENGTH 4
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58 #define BROTLI_MAX_DICTIONARY_WORD_LENGTH 24
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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_COMMON_DICTIONARY_H_ */