Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/gumbo-parser/src/string_buffer.c @ 40:aa33339d6b8a upstream

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ADD: MuPDF v1.26.10: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.5.
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 11:31:38 +0200
parents b50eed0cc0ef
children
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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 "string_buffer.h"
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19 #include <assert.h>
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20 #include <stdlib.h>
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21 #include <string.h>
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22 #include <strings.h>
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24 #include "string_piece.h"
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25 #include "util.h"
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27 struct GumboInternalParser;
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29 // Size chosen via statistical analysis of ~60K websites.
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30 // 99% of text nodes and 98% of attribute names/values fit in this initial size.
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31 static const size_t kDefaultStringBufferSize = 5;
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32
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33 static void maybe_resize_string_buffer(struct GumboInternalParser* parser,
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34 size_t additional_chars, GumboStringBuffer* buffer) {
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35 size_t new_length = buffer->length + additional_chars;
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36 size_t new_capacity = buffer->capacity;
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37 while (new_capacity < new_length) {
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38 new_capacity *= 2;
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39 }
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40 if (new_capacity != buffer->capacity) {
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41 char* new_data = gumbo_parser_allocate(parser, new_capacity);
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42 memcpy(new_data, buffer->data, buffer->length);
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43 gumbo_parser_deallocate(parser, buffer->data);
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44 buffer->data = new_data;
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45 buffer->capacity = new_capacity;
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46 }
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47 }
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48
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49 void gumbo_string_buffer_init(
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50 struct GumboInternalParser* parser, GumboStringBuffer* output) {
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51 output->data = gumbo_parser_allocate(parser, kDefaultStringBufferSize);
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52 output->length = 0;
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53 output->capacity = kDefaultStringBufferSize;
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54 }
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56 void gumbo_string_buffer_reserve(struct GumboInternalParser* parser,
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57 size_t min_capacity, GumboStringBuffer* output) {
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58 maybe_resize_string_buffer(parser, min_capacity - output->length, output);
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59 }
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60
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61 void gumbo_string_buffer_append_codepoint(
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62 struct GumboInternalParser* parser, int c, GumboStringBuffer* output) {
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63 // num_bytes is actually the number of continuation bytes, 1 less than the
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64 // total number of bytes. This is done to keep the loop below simple and
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65 // should probably change if we unroll it.
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66 int num_bytes, prefix;
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67 if (c <= 0x7f) {
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68 num_bytes = 0;
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69 prefix = 0;
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70 } else if (c <= 0x7ff) {
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71 num_bytes = 1;
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72 prefix = 0xc0;
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73 } else if (c <= 0xffff) {
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74 num_bytes = 2;
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75 prefix = 0xe0;
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76 } else {
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77 num_bytes = 3;
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78 prefix = 0xf0;
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79 }
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80 maybe_resize_string_buffer(parser, num_bytes + 1, output);
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81 output->data[output->length++] = prefix | (c >> (num_bytes * 6));
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82 for (int i = num_bytes - 1; i >= 0; --i) {
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83 output->data[output->length++] = 0x80 | (0x3f & (c >> (i * 6)));
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84 }
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85 }
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86
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87 void gumbo_string_buffer_append_string(struct GumboInternalParser* parser,
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88 GumboStringPiece* str, GumboStringBuffer* output) {
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89 maybe_resize_string_buffer(parser, str->length, output);
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90 memcpy(output->data + output->length, str->data, str->length);
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91 output->length += str->length;
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92 }
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93
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94 char* gumbo_string_buffer_to_string(
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95 struct GumboInternalParser* parser, GumboStringBuffer* input) {
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96 char* buffer = gumbo_parser_allocate(parser, input->length + 1);
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97 memcpy(buffer, input->data, input->length);
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98 buffer[input->length] = '\0';
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99 return buffer;
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100 }
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101
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102 void gumbo_string_buffer_clear(
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103 struct GumboInternalParser* parser, GumboStringBuffer* input) {
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104 input->length = 0;
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105 }
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106
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107 void gumbo_string_buffer_destroy(
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108 struct GumboInternalParser* parser, GumboStringBuffer* buffer) {
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109 gumbo_parser_deallocate(parser, buffer->data);
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110 }