Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/gumbo-parser/src/utf8.c @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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1 // Copyright 2010 Google Inc. All Rights Reserved.
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2 //
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3 // Licensed under the Apache License, Version 2.0 (the "License");
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4 // you may not use this file except in compliance with the License.
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5 // You may obtain a copy of the License at
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6 //
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7 // http://www.apache.org/licenses/LICENSE-2.0
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8 //
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9 // Unless required by applicable law or agreed to in writing, software
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10 // distributed under the License is distributed on an "AS IS" BASIS,
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11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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12 // See the License for the specific language governing permissions and
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13 // limitations under the License.
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14 //
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15 // Author: jdtang@google.com (Jonathan Tang)
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17 #include "utf8.h"
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19 #include <assert.h>
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20 #include <stdint.h>
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21 #include <string.h>
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22 #include <strings.h> // For strncasecmp.
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24 #include "error.h"
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25 #include "gumbo.h"
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26 #include "parser.h"
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27 #include "util.h"
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28 #include "vector.h"
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30 const int kUtf8ReplacementChar = 0xFFFD;
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32 // Reference material:
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33 // Wikipedia: http://en.wikipedia.org/wiki/UTF-8#Description
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34 // RFC 3629: http://tools.ietf.org/html/rfc3629
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35 // HTML5 Unicode handling:
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36 // http://www.whatwg.org/specs/web-apps/current-work/multipage/syntax.html#preprocessing-the-input-stream
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37 //
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38 // This implementation is based on a DFA-based decoder by Bjoern Hoehrmann
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39 // <bjoern@hoehrmann.de>. We wrap the inner table-based decoder routine in our
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40 // own handling for newlines, tabs, invalid continuation bytes, and other
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41 // conditions that the HTML5 spec fully specifies but normal UTF8 decoders do
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42 // not handle.
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43 // See http://bjoern.hoehrmann.de/utf-8/decoder/dfa/ for details. Full text of
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44 // the license agreement and code follows.
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46 // Copyright (c) 2008-2009 Bjoern Hoehrmann <bjoern@hoehrmann.de>
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48 // Permission is hereby granted, free of charge, to any person obtaining a copy
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49 // of this software and associated documentation files (the "Software"), to deal
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50 // in the Software without restriction, including without limitation the rights
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51 // to
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52 // use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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53 // of the Software, and to permit persons to whom the Software is furnished to
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54 // do
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55 // so, subject to the following conditions:
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57 // The above copyright notice and this permission notice shall be included in
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58 // all copies or substantial portions of the Software.
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60 #define UTF8_ACCEPT 0
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61 #define UTF8_REJECT 12
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63 static const uint8_t utf8d[] = {
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64 // The first part of the table maps bytes to character classes that
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65 // to reduce the size of the transition table and create bitmasks.
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66 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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67 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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68 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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69 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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70 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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71 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 9, 9, 9, 9, 9, 9,
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72 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
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73 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 8, 8, 2, 2, 2, 2, 2, 2,
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74 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 10,
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75 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 4, 3, 3, 11, 6, 6, 6, 5, 8, 8, 8, 8, 8,
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76 8, 8, 8, 8, 8, 8,
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78 // The second part is a transition table that maps a combination
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79 // of a state of the automaton and a character class to a state.
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80 0, 12, 24, 36, 60, 96, 84, 12, 12, 12, 48, 72, 12, 12, 12, 12, 12, 12, 12,
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81 12, 12, 12, 12, 12, 12, 0, 12, 12, 12, 12, 12, 0, 12, 0, 12, 12, 12, 24, 12,
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82 12, 12, 12, 12, 24, 12, 24, 12, 12, 12, 12, 12, 12, 12, 12, 12, 24, 12, 12,
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83 12, 12, 12, 24, 12, 12, 12, 12, 12, 12, 12, 24, 12, 12, 12, 12, 12, 12, 12,
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84 12, 12, 36, 12, 36, 12, 12, 12, 36, 12, 12, 12, 12, 12, 36, 12, 36, 12, 12,
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85 12, 36, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12,
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86 };
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88 uint32_t static inline decode(uint32_t* state, uint32_t* codep, uint32_t byte) {
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89 uint32_t type = utf8d[byte];
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91 *codep = (*state != UTF8_ACCEPT) ? (byte & 0x3fu) | (*codep << 6)
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92 : (0xff >> type) & (byte);
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93
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diff changeset
94 *state = utf8d[256 + *state + type];
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diff changeset
95 return *state;
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96 }
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97
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98 // END COPIED CODE.
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99
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100 // Adds a decoding error to the parser's error list, based on the current state
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101 // of the Utf8Iterator.
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102 static void add_error(Utf8Iterator* iter, GumboErrorType type) {
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103 GumboParser* parser = iter->_parser;
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104
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105 GumboError* error = gumbo_add_error(parser);
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106 if (!error) {
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107 return;
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108 }
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109 error->type = type;
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110 error->position = iter->_pos;
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111 error->original_text = iter->_start;
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112
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113 // At the point the error is recorded, the code point hasn't been computed
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114 // yet (and can't be, because it's invalid), so we need to build up the raw
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115 // hex value from the bytes under the cursor.
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116 uint64_t code_point = 0;
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117 for (int i = 0; i < iter->_width; ++i) {
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118 code_point = (code_point << 8) | (unsigned char) iter->_start[i];
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119 }
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120 error->v.codepoint = code_point;
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121 }
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122
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123 // Reads the next UTF-8 character in the iter.
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124 // This assumes that iter->_start points to the beginning of the character.
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125 // When this method returns, iter->_width and iter->_current will be set
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126 // appropriately, as well as any error flags.
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127 static void read_char(Utf8Iterator* iter) {
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128 if (iter->_start >= iter->_end) {
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129 // No input left to consume; emit an EOF and set width = 0.
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130 iter->_current = -1;
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131 iter->_width = 0;
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132 return;
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133 }
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134
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135 uint32_t code_point = 0;
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136 uint32_t state = UTF8_ACCEPT;
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137 for (const char* c = iter->_start; c < iter->_end; ++c) {
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138 decode(&state, &code_point, (uint32_t)(unsigned char) (*c));
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139 if (state == UTF8_ACCEPT) {
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140 iter->_width = c - iter->_start + 1;
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141 // This is the special handling for carriage returns that is mandated by
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142 // the HTML5 spec. Since we're looking for particular 7-bit literal
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143 // characters, we operate in terms of chars and only need a check for iter
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144 // overrun, instead of having to read in a full next code point.
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145 // http://www.whatwg.org/specs/web-apps/current-work/multipage/parsing.html#preprocessing-the-input-stream
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146 if (code_point == '\r') {
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147 assert(iter->_width == 1);
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148 const char* next = c + 1;
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149 if (next < iter->_end && *next == '\n') {
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150 // Advance the iter, as if the carriage return didn't exist.
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151 ++iter->_start;
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152 // Preserve the true offset, since other tools that look at it may be
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153 // unaware of HTML5's rules for converting \r into \n.
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154 ++iter->_pos.offset;
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155 }
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156 code_point = '\n';
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157 }
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158 if (utf8_is_invalid_code_point(code_point)) {
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159 add_error(iter, GUMBO_ERR_UTF8_INVALID);
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160 code_point = kUtf8ReplacementChar;
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161 }
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diff changeset
162 iter->_current = code_point;
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163 return;
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164 } else if (state == UTF8_REJECT) {
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165 // We don't want to consume the invalid continuation byte of a multi-byte
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166 // run, but we do want to skip past an invalid first byte.
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167 iter->_width = c - iter->_start + (c == iter->_start);
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168 iter->_current = kUtf8ReplacementChar;
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169 add_error(iter, GUMBO_ERR_UTF8_INVALID);
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170 return;
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171 }
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172 }
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173 // If we got here without exiting early, then we've reached the end of the
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174 // iterator. Add an error for truncated input, set the width to consume the
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175 // rest of the iterator, and emit a replacement character. The next time we
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176 // enter this method, it will detect that there's no input to consume and
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diff changeset
177 // output an EOF.
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diff changeset
178 iter->_current = kUtf8ReplacementChar;
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179 iter->_width = iter->_end - iter->_start;
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180 add_error(iter, GUMBO_ERR_UTF8_TRUNCATED);
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181 }
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182
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diff changeset
183 static void update_position(Utf8Iterator* iter) {
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184 iter->_pos.offset += iter->_width;
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185 if (iter->_current == '\n') {
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186 ++iter->_pos.line;
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diff changeset
187 iter->_pos.column = 1;
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diff changeset
188 } else if (iter->_current == '\t') {
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Franz Glasner <fzglas.hg@dom66.de>
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diff changeset
189 int tab_stop = iter->_parser->_options->tab_stop;
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Franz Glasner <fzglas.hg@dom66.de>
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diff changeset
190 iter->_pos.column = ((iter->_pos.column / tab_stop) + 1) * tab_stop;
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191 } else if (iter->_current != -1) {
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192 ++iter->_pos.column;
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193 }
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194 }
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195
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196 // Returns true if this Unicode code point is in the list of characters
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197 // forbidden by the HTML5 spec, such as undefined control chars.
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198 bool utf8_is_invalid_code_point(int c) {
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199 return (c >= 0x1 && c <= 0x8) || c == 0xB || (c >= 0xE && c <= 0x1F) ||
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200 (c >= 0x7F && c <= 0x9F) || (c >= 0xFDD0 && c <= 0xFDEF) ||
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201 ((c & 0xFFFF) == 0xFFFE) || ((c & 0xFFFF) == 0xFFFF);
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202 }
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203
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204 void utf8iterator_init(GumboParser* parser, const char* source,
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205 size_t source_length, Utf8Iterator* iter) {
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206 iter->_start = source;
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207 iter->_end = source + source_length;
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208 iter->_pos.line = 1;
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209 iter->_pos.column = 1;
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210 iter->_pos.offset = 0;
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211 iter->_parser = parser;
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212 read_char(iter);
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213 }
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214
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215 void utf8iterator_next(Utf8Iterator* iter) {
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216 // We update positions based on the *last* character read, so that the first
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217 // character following a newline is at column 1 in the next line.
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218 update_position(iter);
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219 iter->_start += iter->_width;
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220 read_char(iter);
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221 }
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222
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223 int utf8iterator_current(const Utf8Iterator* iter) { return iter->_current; }
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224
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225 void utf8iterator_get_position(
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226 const Utf8Iterator* iter, GumboSourcePosition* output) {
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227 *output = iter->_pos;
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228 }
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229
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230 const char* utf8iterator_get_char_pointer(const Utf8Iterator* iter) {
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231 return iter->_start;
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232 }
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233
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234 const char* utf8iterator_get_end_pointer(const Utf8Iterator* iter) {
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235 return iter->_end;
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236 }
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237
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238 bool utf8iterator_maybe_consume_match(Utf8Iterator* iter, const char* prefix,
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239 size_t length, bool case_sensitive) {
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240 bool matched = (iter->_start + length <= iter->_end) &&
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241 (case_sensitive ? !strncmp(iter->_start, prefix, length)
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242 : !strncasecmp(iter->_start, prefix, length));
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243 if (matched) {
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244 for (unsigned int i = 0; i < length; ++i) {
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245 utf8iterator_next(iter);
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246 }
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247 return true;
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248 } else {
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249 return false;
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250 }
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251 }
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252
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253 void utf8iterator_mark(Utf8Iterator* iter) {
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diff changeset
254 iter->_mark = iter->_start;
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255 iter->_mark_pos = iter->_pos;
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256 }
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257
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258 // Returns the current input stream position to the mark.
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259 void utf8iterator_reset(Utf8Iterator* iter) {
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diff changeset
260 iter->_start = iter->_mark;
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diff changeset
261 iter->_pos = iter->_mark_pos;
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diff changeset
262 read_char(iter);
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263 }
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diff changeset
264
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265 // Sets the position and original text fields of an error to the value at the
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266 // mark.
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diff changeset
267 void utf8iterator_fill_error_at_mark(Utf8Iterator* iter, GumboError* error) {
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diff changeset
268 error->position = iter->_mark_pos;
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diff changeset
269 error->original_text = iter->_mark;
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270 }