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annotate dep/pugixml/docs/samples/save_custom_writer.cpp @ 337:a7d4e5107531

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dep/animone: REFACTOR ALL THE THINGS 1: animone now has its own syntax divergent from anisthesia, making different platforms actually have their own sections 2: process names in animone are now called `comm' (this will probably break things). this is what its called in bsd/linux so I'm just going to use it everywhere 3: the X11 code now checks for the existence of a UTF-8 window title and passes it if available 4: ANYTHING THATS NOT LINUX IS 100% UNTESTED AND CAN AND WILL BREAK! I still actually need to test the bsd code. to be honest I'm probably going to move all of the bsds into separate files because they're all essentially different operating systems at this point
author Paper <paper@paper.us.eu.org>
date Wed, 19 Jun 2024 12:51:15 -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