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annotate dep/pugixml/docs/samples/save_custom_writer.cpp @ 331:3c755136f074

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author Paper <paper@paper.us.eu.org>
date Mon, 17 Jun 2024 18:30:54 -0400
parents d10b6c6b432e
children
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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