Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/brotli/c/enc/utf8_util.c @ 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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2
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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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6
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7 /* Heuristics for deciding about the UTF8-ness of strings. */
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8
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9 #include "utf8_util.h"
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11 #include <brotli/types.h>
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12
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13 #if defined(__cplusplus) || defined(c_plusplus)
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14 extern "C" {
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15 #endif
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17 static size_t BrotliParseAsUTF8(
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18 int* symbol, const uint8_t* input, size_t size) {
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19 /* ASCII */
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20 if ((input[0] & 0x80) == 0) {
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21 *symbol = input[0];
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22 if (*symbol > 0) {
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23 return 1;
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24 }
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25 }
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26 /* 2-byte UTF8 */
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27 if (size > 1u &&
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28 (input[0] & 0xE0) == 0xC0 &&
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29 (input[1] & 0xC0) == 0x80) {
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30 *symbol = (((input[0] & 0x1F) << 6) |
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31 (input[1] & 0x3F));
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32 if (*symbol > 0x7F) {
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33 return 2;
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34 }
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35 }
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36 /* 3-byte UFT8 */
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37 if (size > 2u &&
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38 (input[0] & 0xF0) == 0xE0 &&
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39 (input[1] & 0xC0) == 0x80 &&
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40 (input[2] & 0xC0) == 0x80) {
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41 *symbol = (((input[0] & 0x0F) << 12) |
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42 ((input[1] & 0x3F) << 6) |
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43 (input[2] & 0x3F));
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44 if (*symbol > 0x7FF) {
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45 return 3;
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46 }
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47 }
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48 /* 4-byte UFT8 */
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49 if (size > 3u &&
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50 (input[0] & 0xF8) == 0xF0 &&
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51 (input[1] & 0xC0) == 0x80 &&
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52 (input[2] & 0xC0) == 0x80 &&
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53 (input[3] & 0xC0) == 0x80) {
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54 *symbol = (((input[0] & 0x07) << 18) |
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55 ((input[1] & 0x3F) << 12) |
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56 ((input[2] & 0x3F) << 6) |
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57 (input[3] & 0x3F));
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58 if (*symbol > 0xFFFF && *symbol <= 0x10FFFF) {
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59 return 4;
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60 }
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61 }
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62 /* Not UTF8, emit a special symbol above the UTF8-code space */
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63 *symbol = 0x110000 | input[0];
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64 return 1;
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65 }
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66
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67 /* Returns 1 if at least min_fraction of the data is UTF8-encoded.*/
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68 BROTLI_BOOL BrotliIsMostlyUTF8(
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69 const uint8_t* data, const size_t pos, const size_t mask,
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70 const size_t length, const double min_fraction) {
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71 size_t size_utf8 = 0;
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72 size_t i = 0;
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73 while (i < length) {
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74 int symbol;
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75 size_t bytes_read =
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76 BrotliParseAsUTF8(&symbol, &data[(pos + i) & mask], length - i);
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77 i += bytes_read;
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78 if (symbol < 0x110000) size_utf8 += bytes_read;
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79 }
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80 return TO_BROTLI_BOOL((double)size_utf8 > min_fraction * (double)length);
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81 }
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82
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83 #if defined(__cplusplus) || defined(c_plusplus)
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84 } /* extern "C" */
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85 #endif