63 lines
2.1 KiB
C++
63 lines
2.1 KiB
C++
#ifndef OBJECT_ENCODER_HPP
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#define OBJECT_ENCODER_HPP
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#include <boost/assert.hpp>
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#include <boost/archive/iterators/base64_from_binary.hpp>
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#include <boost/archive/iterators/binary_from_base64.hpp>
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#include <boost/archive/iterators/transform_width.hpp>
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#include <algorithm>
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#include <iterator>
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#include <string>
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#include <vector>
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struct ObjectEncoder
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{
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using base64_t = boost::archive::iterators::base64_from_binary<
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boost::archive::iterators::transform_width<const char *, 6, 8>>;
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using binary_t = boost::archive::iterators::transform_width<
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boost::archive::iterators::binary_from_base64<std::string::const_iterator>,
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8,
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6>;
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template <class ObjectT> static void EncodeToBase64(const ObjectT &object, std::string &encoded)
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{
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const char *char_ptr_to_object = reinterpret_cast<const char *>(&object);
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std::vector<unsigned char> data(sizeof(object));
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std::copy(char_ptr_to_object, char_ptr_to_object + sizeof(ObjectT), data.begin());
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unsigned char number_of_padded_chars = 0; // is in {0,1,2};
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while (data.size() % 3 != 0)
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{
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++number_of_padded_chars;
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data.push_back(0x00);
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}
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BOOST_ASSERT_MSG(0 == data.size() % 3, "base64 input data size is not a multiple of 3!");
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encoded.resize(sizeof(ObjectT));
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encoded.assign(base64_t(&data[0]),
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base64_t(&data[0] + (data.size() - number_of_padded_chars)));
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std::replace(begin(encoded), end(encoded), '+', '-');
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std::replace(begin(encoded), end(encoded), '/', '_');
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}
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template <class ObjectT> static void DecodeFromBase64(const std::string &input, ObjectT &object)
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{
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try
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{
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std::string encoded(input);
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std::replace(begin(encoded), end(encoded), '-', '+');
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std::replace(begin(encoded), end(encoded), '_', '/');
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std::copy(binary_t(encoded.begin()), binary_t(encoded.begin() + encoded.length()),
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reinterpret_cast<char *>(&object));
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}
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catch (...)
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{
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}
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}
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};
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#endif /* OBJECT_ENCODER_HPP */
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