Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/brotli/c/enc/find_match_length.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
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1 /* Copyright 2010 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 /* Function to find maximal matching prefixes of strings. */
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9 #ifndef BROTLI_ENC_FIND_MATCH_LENGTH_H_
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10 #define BROTLI_ENC_FIND_MATCH_LENGTH_H_
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12 #include <brotli/types.h>
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14 #include "../common/platform.h"
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16 #if defined(__cplusplus) || defined(c_plusplus)
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17 extern "C" {
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18 #endif
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20 /* Separate implementation for little-endian 64-bit targets, for speed. */
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21 #if defined(BROTLI_TZCNT64) && BROTLI_64_BITS && BROTLI_LITTLE_ENDIAN
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22 static BROTLI_INLINE size_t FindMatchLengthWithLimit(const uint8_t* s1,
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23 const uint8_t* s2,
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24 size_t limit) {
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25 const uint8_t *s1_orig = s1;
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26 for (; limit >= 8; limit -= 8) {
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27 uint64_t x = BROTLI_UNALIGNED_LOAD64LE(s2) ^
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28 BROTLI_UNALIGNED_LOAD64LE(s1);
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29 s2 += 8;
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30 if (x != 0) {
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31 size_t matching_bits = (size_t)BROTLI_TZCNT64(x);
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32 return (size_t)(s1 - s1_orig) + (matching_bits >> 3);
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33 }
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34 s1 += 8;
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35 }
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36 while (limit && *s1 == *s2) {
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37 limit--;
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38 ++s2;
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39 ++s1;
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40 }
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41 return (size_t)(s1 - s1_orig);
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42 }
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43 #else
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44 static BROTLI_INLINE size_t FindMatchLengthWithLimit(const uint8_t* s1,
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45 const uint8_t* s2,
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46 size_t limit) {
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47 size_t matched = 0;
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48 const uint8_t* s2_limit = s2 + limit;
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49 const uint8_t* s2_ptr = s2;
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50 /* Find out how long the match is. We loop over the data 32 bits at a
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51 time until we find a 32-bit block that doesn't match; then we find
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52 the first non-matching bit and use that to calculate the total
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53 length of the match. */
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54 while (s2_ptr <= s2_limit - 4 &&
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55 BrotliUnalignedRead32(s2_ptr) ==
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56 BrotliUnalignedRead32(s1 + matched)) {
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57 s2_ptr += 4;
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58 matched += 4;
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59 }
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60 while ((s2_ptr < s2_limit) && (s1[matched] == *s2_ptr)) {
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61 ++s2_ptr;
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62 ++matched;
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63 }
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64 return matched;
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65 }
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66 #endif
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67
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68 #if defined(__cplusplus) || defined(c_plusplus)
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69 } /* extern "C" */
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70 #endif
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71
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72 #endif /* BROTLI_ENC_FIND_MATCH_LENGTH_H_ */