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annotate dep/pugixml/docs/samples/save_custom_writer.cpp @ 187:9613d72b097e

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*: multiple performance improvements like marking `static const` when it makes sense... date: change old stupid heap-based method to a structure which should make copying the thing actually make a copy. also many performance-based changes, like removing the std::tie dependency and forward-declaring nlohmann json *: replace every instance of QString::fromUtf8 to Strings::ToQString. the main difference is that our function will always convert exactly what is in the string, while some other times it would only convert up to the nearest NUL byte
author Paper <mrpapersonic@gmail.com>
date Wed, 06 Dec 2023 13:43:54 -0500
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55
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1 #include "pugixml.hpp"
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2
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3 #include <string>
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4 #include <iostream>
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5 #include <cstring>
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6
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7 // tag::code[]
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8 struct xml_string_writer: pugi::xml_writer
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9 {
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10 std::string result;
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11
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12 virtual void write(const void* data, size_t size)
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13 {
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14 result.append(static_cast<const char*>(data), size);
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15 }
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16 };
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17 // end::code[]
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18
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19 struct xml_memory_writer: pugi::xml_writer
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20 {
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21 char* buffer;
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22 size_t capacity;
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23
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24 size_t result;
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25
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26 xml_memory_writer(): buffer(0), capacity(0), result(0)
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27 {
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28 }
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29
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30 xml_memory_writer(char* buffer, size_t capacity): buffer(buffer), capacity(capacity), result(0)
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31 {
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32 }
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33
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34 size_t written_size() const
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35 {
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36 return result < capacity ? result : capacity;
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37 }
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38
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39 virtual void write(const void* data, size_t size)
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40 {
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41 if (result < capacity)
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42 {
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43 size_t chunk = (capacity - result < size) ? capacity - result : size;
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44
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45 memcpy(buffer + result, data, chunk);
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46 }
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47
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48 result += size;
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49 }
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50 };
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51
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52 std::string node_to_string(pugi::xml_node node)
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53 {
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54 xml_string_writer writer;
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55 node.print(writer);
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56
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57 return writer.result;
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58 }
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59
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60 char* node_to_buffer(pugi::xml_node node, char* buffer, size_t size)
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61 {
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62 if (size == 0) return buffer;
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63
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64 // leave one character for null terminator
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65 xml_memory_writer writer(buffer, size - 1);
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66 node.print(writer);
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67
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68 // null terminate
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69 buffer[writer.written_size()] = 0;
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70
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71 return buffer;
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72 }
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73
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74 char* node_to_buffer_heap(pugi::xml_node node)
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75 {
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76 // first pass: get required memory size
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77 xml_memory_writer counter;
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78 node.print(counter);
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79
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80 // allocate necessary size (+1 for null termination)
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81 char* buffer = new char[counter.result + 1];
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82
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83 // second pass: actual printing
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84 xml_memory_writer writer(buffer, counter.result);
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85 node.print(writer);
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86
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87 // null terminate
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88 buffer[writer.written_size()] = 0;
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89
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90 return buffer;
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91 }
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92
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93 int main()
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94 {
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95 // get a test document
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96 pugi::xml_document doc;
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97 doc.load_string("<foo bar='baz'>hey</foo>");
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98
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99 // get contents as std::string (single pass)
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100 std::cout << "contents: [" << node_to_string(doc) << "]\n";
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101
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102 // get contents into fixed-size buffer (single pass)
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103 char large_buf[128];
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104 std::cout << "contents: [" << node_to_buffer(doc, large_buf, sizeof(large_buf)) << "]\n";
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105
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106 // get contents into fixed-size buffer (single pass, shows truncating behavior)
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107 char small_buf[22];
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108 std::cout << "contents: [" << node_to_buffer(doc, small_buf, sizeof(small_buf)) << "]\n";
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109
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110 // get contents into heap-allocated buffer (two passes)
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111 char* heap_buf = node_to_buffer_heap(doc);
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112 std::cout << "contents: [" << heap_buf << "]\n";
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113 delete[] heap_buf;
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114 }
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115
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116 // vim:et