mirror of
https://github.com/RetroDECK/ES-DE.git
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117 lines
2.6 KiB
C++
117 lines
2.6 KiB
C++
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#include "pugixml.hpp"
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#include <string>
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#include <iostream>
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#include <cstring>
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// tag::code[]
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struct xml_string_writer: pugi::xml_writer
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{
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std::string result;
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virtual void write(const void* data, size_t size)
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{
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result.append(static_cast<const char*>(data), size);
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}
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};
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// end::code[]
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struct xml_memory_writer: pugi::xml_writer
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{
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char* buffer;
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size_t capacity;
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size_t result;
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xml_memory_writer(): buffer(0), capacity(0), result(0)
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{
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}
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xml_memory_writer(char* buffer, size_t capacity): buffer(buffer), capacity(capacity), result(0)
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{
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}
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size_t written_size() const
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{
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return result < capacity ? result : capacity;
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}
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virtual void write(const void* data, size_t size)
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{
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if (result < capacity)
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{
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size_t chunk = (capacity - result < size) ? capacity - result : size;
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memcpy(buffer + result, data, chunk);
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}
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result += size;
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}
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};
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std::string node_to_string(pugi::xml_node node)
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{
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xml_string_writer writer;
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node.print(writer);
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return writer.result;
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}
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char* node_to_buffer(pugi::xml_node node, char* buffer, size_t size)
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{
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if (size == 0) return buffer;
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// leave one character for null terminator
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xml_memory_writer writer(buffer, size - 1);
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node.print(writer);
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// null terminate
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buffer[writer.written_size()] = 0;
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return buffer;
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}
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char* node_to_buffer_heap(pugi::xml_node node)
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{
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// first pass: get required memory size
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xml_memory_writer counter;
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node.print(counter);
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// allocate necessary size (+1 for null termination)
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char* buffer = new char[counter.result + 1];
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// second pass: actual printing
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xml_memory_writer writer(buffer, counter.result);
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node.print(writer);
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// null terminate
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buffer[writer.written_size()] = 0;
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return buffer;
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}
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int main()
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{
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// get a test document
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pugi::xml_document doc;
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doc.load_string("<foo bar='baz'>hey</foo>");
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// get contents as std::string (single pass)
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std::cout << "contents: [" << node_to_string(doc) << "]\n";
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// get contents into fixed-size buffer (single pass)
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char large_buf[128];
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std::cout << "contents: [" << node_to_buffer(doc, large_buf, sizeof(large_buf)) << "]\n";
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// get contents into fixed-size buffer (single pass, shows truncating behavior)
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char small_buf[22];
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std::cout << "contents: [" << node_to_buffer(doc, small_buf, sizeof(small_buf)) << "]\n";
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// get contents into heap-allocated buffer (two passes)
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char* heap_buf = node_to_buffer_heap(doc);
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std::cout << "contents: [" << heap_buf << "]\n";
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delete[] heap_buf;
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}
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// vim:et
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