Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/brotli/c/enc/prefix.h @ 17:dd9cdb856310

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Remove PKG-INFO from the because it is regenerated automatically for the sdist
author Franz Glasner <fzglas.hg@dom66.de>
date Thu, 18 Sep 2025 17:40:40 +0200
parents b50eed0cc0ef
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 for encoding of integers into prefix codes the amount of extra
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8 bits, and the actual values of the extra bits. */
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10 #ifndef BROTLI_ENC_PREFIX_H_
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11 #define BROTLI_ENC_PREFIX_H_
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13 #include <brotli/types.h>
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15 #include "../common/constants.h"
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16 #include "../common/platform.h"
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17 #include "fast_log.h"
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19 #if defined(__cplusplus) || defined(c_plusplus)
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20 extern "C" {
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21 #endif
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23 /* Here distance_code is an intermediate code, i.e. one of the special codes or
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24 the actual distance increased by BROTLI_NUM_DISTANCE_SHORT_CODES - 1. */
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25 static BROTLI_INLINE void PrefixEncodeCopyDistance(size_t distance_code,
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26 size_t num_direct_codes,
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27 size_t postfix_bits,
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28 uint16_t* code,
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29 uint32_t* extra_bits) {
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30 if (distance_code < BROTLI_NUM_DISTANCE_SHORT_CODES + num_direct_codes) {
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31 *code = (uint16_t)distance_code;
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32 *extra_bits = 0;
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33 return;
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34 } else {
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35 size_t dist = ((size_t)1 << (postfix_bits + 2u)) +
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36 (distance_code - BROTLI_NUM_DISTANCE_SHORT_CODES - num_direct_codes);
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37 size_t bucket = Log2FloorNonZero(dist) - 1;
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38 size_t postfix_mask = (1u << postfix_bits) - 1;
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39 size_t postfix = dist & postfix_mask;
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40 size_t prefix = (dist >> bucket) & 1;
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41 size_t offset = (2 + prefix) << bucket;
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42 size_t nbits = bucket - postfix_bits;
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43 *code = (uint16_t)((nbits << 10) |
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44 (BROTLI_NUM_DISTANCE_SHORT_CODES + num_direct_codes +
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45 ((2 * (nbits - 1) + prefix) << postfix_bits) + postfix));
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46 *extra_bits = (uint32_t)((dist - offset) >> postfix_bits);
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47 }
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48 }
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50 #if defined(__cplusplus) || defined(c_plusplus)
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51 } /* extern "C" */
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52 #endif
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54 #endif /* BROTLI_ENC_PREFIX_H_ */