mirror of
https://github.com/nlohmann/json
synced 2024-12-02 16:30:11 +00:00
1073 lines
39 KiB
C++
1073 lines
39 KiB
C++
#pragma once
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#include <algorithm> // reverse
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#include <array> // array
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#include <cstdint> // uint8_t, uint16_t, uint32_t, uint64_t
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#include <cstring> // memcpy
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#include <limits> // numeric_limits
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#include <nlohmann/detail/input/binary_reader.hpp>
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#include <nlohmann/detail/output/output_adapters.hpp>
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namespace nlohmann
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{
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namespace detail
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{
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///////////////////
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// binary writer //
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///////////////////
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/*!
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@brief serialization to CBOR and MessagePack values
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*/
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template<typename BasicJsonType, typename CharType>
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class binary_writer
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{
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public:
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/*!
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@brief create a binary writer
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@param[in] adapter output adapter to write to
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*/
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explicit binary_writer(output_adapter_t<CharType> adapter) : oa(adapter)
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{
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assert(oa);
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}
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/*!
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@brief[in] j JSON value to serialize
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*/
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void write_cbor(const BasicJsonType& j)
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{
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switch (j.type())
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{
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case value_t::null:
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{
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oa->write_character(static_cast<CharType>(0xF6));
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break;
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}
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case value_t::boolean:
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{
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oa->write_character(j.m_value.boolean
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? static_cast<CharType>(0xF5)
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: static_cast<CharType>(0xF4));
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break;
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}
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case value_t::number_integer:
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{
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if (j.m_value.number_integer >= 0)
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{
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// CBOR does not differentiate between positive signed
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// integers and unsigned integers. Therefore, we used the
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// code from the value_t::number_unsigned case here.
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if (j.m_value.number_integer <= 0x17)
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{
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write_number(static_cast<uint8_t>(j.m_value.number_integer));
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}
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else if (j.m_value.number_integer <= (std::numeric_limits<uint8_t>::max)())
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{
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oa->write_character(static_cast<CharType>(0x18));
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write_number(static_cast<uint8_t>(j.m_value.number_integer));
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}
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else if (j.m_value.number_integer <= (std::numeric_limits<uint16_t>::max)())
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{
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oa->write_character(static_cast<CharType>(0x19));
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write_number(static_cast<uint16_t>(j.m_value.number_integer));
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}
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else if (j.m_value.number_integer <= (std::numeric_limits<uint32_t>::max)())
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{
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oa->write_character(static_cast<CharType>(0x1A));
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write_number(static_cast<uint32_t>(j.m_value.number_integer));
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}
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else
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{
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oa->write_character(static_cast<CharType>(0x1B));
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write_number(static_cast<uint64_t>(j.m_value.number_integer));
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}
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}
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else
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{
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// The conversions below encode the sign in the first
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// byte, and the value is converted to a positive number.
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const auto positive_number = -1 - j.m_value.number_integer;
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if (j.m_value.number_integer >= -24)
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{
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write_number(static_cast<uint8_t>(0x20 + positive_number));
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}
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else if (positive_number <= (std::numeric_limits<uint8_t>::max)())
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{
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oa->write_character(static_cast<CharType>(0x38));
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write_number(static_cast<uint8_t>(positive_number));
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}
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else if (positive_number <= (std::numeric_limits<uint16_t>::max)())
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{
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oa->write_character(static_cast<CharType>(0x39));
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write_number(static_cast<uint16_t>(positive_number));
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}
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else if (positive_number <= (std::numeric_limits<uint32_t>::max)())
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{
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oa->write_character(static_cast<CharType>(0x3A));
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write_number(static_cast<uint32_t>(positive_number));
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}
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else
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{
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oa->write_character(static_cast<CharType>(0x3B));
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write_number(static_cast<uint64_t>(positive_number));
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}
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}
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break;
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}
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case value_t::number_unsigned:
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{
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if (j.m_value.number_unsigned <= 0x17)
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{
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write_number(static_cast<uint8_t>(j.m_value.number_unsigned));
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}
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else if (j.m_value.number_unsigned <= (std::numeric_limits<uint8_t>::max)())
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{
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oa->write_character(static_cast<CharType>(0x18));
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write_number(static_cast<uint8_t>(j.m_value.number_unsigned));
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}
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else if (j.m_value.number_unsigned <= (std::numeric_limits<uint16_t>::max)())
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{
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oa->write_character(static_cast<CharType>(0x19));
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write_number(static_cast<uint16_t>(j.m_value.number_unsigned));
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}
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else if (j.m_value.number_unsigned <= (std::numeric_limits<uint32_t>::max)())
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{
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oa->write_character(static_cast<CharType>(0x1A));
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write_number(static_cast<uint32_t>(j.m_value.number_unsigned));
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}
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else
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{
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oa->write_character(static_cast<CharType>(0x1B));
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write_number(static_cast<uint64_t>(j.m_value.number_unsigned));
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}
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break;
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}
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case value_t::number_float:
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{
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oa->write_character(get_cbor_float_prefix(j.m_value.number_float));
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write_number(j.m_value.number_float);
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break;
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}
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case value_t::string:
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{
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// step 1: write control byte and the string length
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const auto N = j.m_value.string->size();
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if (N <= 0x17)
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{
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write_number(static_cast<uint8_t>(0x60 + N));
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}
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else if (N <= (std::numeric_limits<uint8_t>::max)())
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{
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oa->write_character(static_cast<CharType>(0x78));
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write_number(static_cast<uint8_t>(N));
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}
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else if (N <= (std::numeric_limits<uint16_t>::max)())
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{
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oa->write_character(static_cast<CharType>(0x79));
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write_number(static_cast<uint16_t>(N));
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}
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else if (N <= (std::numeric_limits<uint32_t>::max)())
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{
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oa->write_character(static_cast<CharType>(0x7A));
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write_number(static_cast<uint32_t>(N));
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}
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// LCOV_EXCL_START
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else if (N <= (std::numeric_limits<uint64_t>::max)())
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{
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oa->write_character(static_cast<CharType>(0x7B));
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write_number(static_cast<uint64_t>(N));
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}
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// LCOV_EXCL_STOP
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// step 2: write the string
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oa->write_characters(
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reinterpret_cast<const CharType*>(j.m_value.string->c_str()),
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j.m_value.string->size());
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break;
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}
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case value_t::array:
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{
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// step 1: write control byte and the array size
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const auto N = j.m_value.array->size();
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if (N <= 0x17)
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{
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write_number(static_cast<uint8_t>(0x80 + N));
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}
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else if (N <= (std::numeric_limits<uint8_t>::max)())
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{
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oa->write_character(static_cast<CharType>(0x98));
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write_number(static_cast<uint8_t>(N));
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}
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else if (N <= (std::numeric_limits<uint16_t>::max)())
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{
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oa->write_character(static_cast<CharType>(0x99));
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write_number(static_cast<uint16_t>(N));
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}
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else if (N <= (std::numeric_limits<uint32_t>::max)())
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{
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oa->write_character(static_cast<CharType>(0x9A));
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write_number(static_cast<uint32_t>(N));
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}
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// LCOV_EXCL_START
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else if (N <= (std::numeric_limits<uint64_t>::max)())
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{
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oa->write_character(static_cast<CharType>(0x9B));
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write_number(static_cast<uint64_t>(N));
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}
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// LCOV_EXCL_STOP
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// step 2: write each element
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for (const auto& el : *j.m_value.array)
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{
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write_cbor(el);
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}
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break;
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}
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case value_t::object:
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{
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// step 1: write control byte and the object size
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const auto N = j.m_value.object->size();
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if (N <= 0x17)
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{
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write_number(static_cast<uint8_t>(0xA0 + N));
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}
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else if (N <= (std::numeric_limits<uint8_t>::max)())
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{
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oa->write_character(static_cast<CharType>(0xB8));
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write_number(static_cast<uint8_t>(N));
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}
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else if (N <= (std::numeric_limits<uint16_t>::max)())
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{
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oa->write_character(static_cast<CharType>(0xB9));
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write_number(static_cast<uint16_t>(N));
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}
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else if (N <= (std::numeric_limits<uint32_t>::max)())
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{
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oa->write_character(static_cast<CharType>(0xBA));
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write_number(static_cast<uint32_t>(N));
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}
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// LCOV_EXCL_START
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else if (N <= (std::numeric_limits<uint64_t>::max)())
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{
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oa->write_character(static_cast<CharType>(0xBB));
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write_number(static_cast<uint64_t>(N));
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}
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// LCOV_EXCL_STOP
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// step 2: write each element
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for (const auto& el : *j.m_value.object)
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{
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write_cbor(el.first);
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write_cbor(el.second);
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}
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break;
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}
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default:
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break;
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}
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}
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/*!
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@brief[in] j JSON value to serialize
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*/
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void write_msgpack(const BasicJsonType& j)
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{
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switch (j.type())
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{
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case value_t::null: // nil
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{
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oa->write_character(static_cast<CharType>(0xC0));
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break;
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}
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case value_t::boolean: // true and false
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{
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oa->write_character(j.m_value.boolean
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? static_cast<CharType>(0xC3)
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: static_cast<CharType>(0xC2));
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break;
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}
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case value_t::number_integer:
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{
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if (j.m_value.number_integer >= 0)
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{
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// MessagePack does not differentiate between positive
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// signed integers and unsigned integers. Therefore, we used
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// the code from the value_t::number_unsigned case here.
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if (j.m_value.number_unsigned < 128)
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{
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// positive fixnum
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write_number(static_cast<uint8_t>(j.m_value.number_integer));
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}
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else if (j.m_value.number_unsigned <= (std::numeric_limits<uint8_t>::max)())
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{
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// uint 8
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oa->write_character(static_cast<CharType>(0xCC));
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write_number(static_cast<uint8_t>(j.m_value.number_integer));
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}
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else if (j.m_value.number_unsigned <= (std::numeric_limits<uint16_t>::max)())
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{
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// uint 16
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oa->write_character(static_cast<CharType>(0xCD));
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write_number(static_cast<uint16_t>(j.m_value.number_integer));
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}
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else if (j.m_value.number_unsigned <= (std::numeric_limits<uint32_t>::max)())
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{
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// uint 32
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oa->write_character(static_cast<CharType>(0xCE));
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write_number(static_cast<uint32_t>(j.m_value.number_integer));
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}
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else if (j.m_value.number_unsigned <= (std::numeric_limits<uint64_t>::max)())
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{
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// uint 64
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oa->write_character(static_cast<CharType>(0xCF));
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write_number(static_cast<uint64_t>(j.m_value.number_integer));
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}
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}
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else
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{
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if (j.m_value.number_integer >= -32)
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{
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// negative fixnum
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write_number(static_cast<int8_t>(j.m_value.number_integer));
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}
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else if (j.m_value.number_integer >= (std::numeric_limits<int8_t>::min)() and
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j.m_value.number_integer <= (std::numeric_limits<int8_t>::max)())
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{
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// int 8
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oa->write_character(static_cast<CharType>(0xD0));
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write_number(static_cast<int8_t>(j.m_value.number_integer));
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}
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else if (j.m_value.number_integer >= (std::numeric_limits<int16_t>::min)() and
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j.m_value.number_integer <= (std::numeric_limits<int16_t>::max)())
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{
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// int 16
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oa->write_character(static_cast<CharType>(0xD1));
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write_number(static_cast<int16_t>(j.m_value.number_integer));
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}
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else if (j.m_value.number_integer >= (std::numeric_limits<int32_t>::min)() and
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j.m_value.number_integer <= (std::numeric_limits<int32_t>::max)())
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{
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// int 32
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oa->write_character(static_cast<CharType>(0xD2));
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write_number(static_cast<int32_t>(j.m_value.number_integer));
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}
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else if (j.m_value.number_integer >= (std::numeric_limits<int64_t>::min)() and
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j.m_value.number_integer <= (std::numeric_limits<int64_t>::max)())
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{
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// int 64
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oa->write_character(static_cast<CharType>(0xD3));
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write_number(static_cast<int64_t>(j.m_value.number_integer));
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}
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}
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break;
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}
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case value_t::number_unsigned:
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{
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if (j.m_value.number_unsigned < 128)
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{
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// positive fixnum
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write_number(static_cast<uint8_t>(j.m_value.number_integer));
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}
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else if (j.m_value.number_unsigned <= (std::numeric_limits<uint8_t>::max)())
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{
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// uint 8
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oa->write_character(static_cast<CharType>(0xCC));
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write_number(static_cast<uint8_t>(j.m_value.number_integer));
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}
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else if (j.m_value.number_unsigned <= (std::numeric_limits<uint16_t>::max)())
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{
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// uint 16
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oa->write_character(static_cast<CharType>(0xCD));
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write_number(static_cast<uint16_t>(j.m_value.number_integer));
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}
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else if (j.m_value.number_unsigned <= (std::numeric_limits<uint32_t>::max)())
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{
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// uint 32
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oa->write_character(static_cast<CharType>(0xCE));
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write_number(static_cast<uint32_t>(j.m_value.number_integer));
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}
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else if (j.m_value.number_unsigned <= (std::numeric_limits<uint64_t>::max)())
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{
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// uint 64
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oa->write_character(static_cast<CharType>(0xCF));
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write_number(static_cast<uint64_t>(j.m_value.number_integer));
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}
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break;
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}
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case value_t::number_float:
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{
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oa->write_character(get_msgpack_float_prefix(j.m_value.number_float));
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write_number(j.m_value.number_float);
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break;
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}
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case value_t::string:
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{
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// step 1: write control byte and the string length
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const auto N = j.m_value.string->size();
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if (N <= 31)
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{
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// fixstr
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write_number(static_cast<uint8_t>(0xA0 | N));
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}
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else if (N <= (std::numeric_limits<uint8_t>::max)())
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{
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// str 8
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oa->write_character(static_cast<CharType>(0xD9));
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write_number(static_cast<uint8_t>(N));
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}
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else if (N <= (std::numeric_limits<uint16_t>::max)())
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{
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// str 16
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oa->write_character(static_cast<CharType>(0xDA));
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write_number(static_cast<uint16_t>(N));
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}
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else if (N <= (std::numeric_limits<uint32_t>::max)())
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{
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// str 32
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oa->write_character(static_cast<CharType>(0xDB));
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write_number(static_cast<uint32_t>(N));
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}
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// step 2: write the string
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oa->write_characters(
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reinterpret_cast<const CharType*>(j.m_value.string->c_str()),
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j.m_value.string->size());
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break;
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}
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case value_t::array:
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{
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// step 1: write control byte and the array size
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const auto N = j.m_value.array->size();
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if (N <= 15)
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{
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// fixarray
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write_number(static_cast<uint8_t>(0x90 | N));
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}
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else if (N <= (std::numeric_limits<uint16_t>::max)())
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{
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// array 16
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oa->write_character(static_cast<CharType>(0xDC));
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write_number(static_cast<uint16_t>(N));
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}
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else if (N <= (std::numeric_limits<uint32_t>::max)())
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{
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// array 32
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oa->write_character(static_cast<CharType>(0xDD));
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write_number(static_cast<uint32_t>(N));
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}
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// step 2: write each element
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for (const auto& el : *j.m_value.array)
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{
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write_msgpack(el);
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}
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break;
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}
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|
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case value_t::object:
|
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{
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// step 1: write control byte and the object size
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const auto N = j.m_value.object->size();
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if (N <= 15)
|
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{
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// fixmap
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|
write_number(static_cast<uint8_t>(0x80 | (N & 0xF)));
|
|
}
|
|
else if (N <= (std::numeric_limits<uint16_t>::max)())
|
|
{
|
|
// map 16
|
|
oa->write_character(static_cast<CharType>(0xDE));
|
|
write_number(static_cast<uint16_t>(N));
|
|
}
|
|
else if (N <= (std::numeric_limits<uint32_t>::max)())
|
|
{
|
|
// map 32
|
|
oa->write_character(static_cast<CharType>(0xDF));
|
|
write_number(static_cast<uint32_t>(N));
|
|
}
|
|
|
|
// step 2: write each element
|
|
for (const auto& el : *j.m_value.object)
|
|
{
|
|
write_msgpack(el.first);
|
|
write_msgpack(el.second);
|
|
}
|
|
break;
|
|
}
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*!
|
|
@param[in] j JSON value to serialize
|
|
@param[in] use_count whether to use '#' prefixes (optimized format)
|
|
@param[in] use_type whether to use '$' prefixes (optimized format)
|
|
@param[in] add_prefix whether prefixes need to be used for this value
|
|
*/
|
|
void write_ubjson(const BasicJsonType& j, const bool use_count,
|
|
const bool use_type, const bool add_prefix = true)
|
|
{
|
|
switch (j.type())
|
|
{
|
|
case value_t::null:
|
|
{
|
|
if (add_prefix)
|
|
{
|
|
oa->write_character(static_cast<CharType>('Z'));
|
|
}
|
|
break;
|
|
}
|
|
|
|
case value_t::boolean:
|
|
{
|
|
if (add_prefix)
|
|
oa->write_character(j.m_value.boolean
|
|
? static_cast<CharType>('T')
|
|
: static_cast<CharType>('F'));
|
|
break;
|
|
}
|
|
|
|
case value_t::number_integer:
|
|
{
|
|
write_number_with_ubjson_prefix(j.m_value.number_integer, add_prefix);
|
|
break;
|
|
}
|
|
|
|
case value_t::number_unsigned:
|
|
{
|
|
write_number_with_ubjson_prefix(j.m_value.number_unsigned, add_prefix);
|
|
break;
|
|
}
|
|
|
|
case value_t::number_float:
|
|
{
|
|
write_number_with_ubjson_prefix(j.m_value.number_float, add_prefix);
|
|
break;
|
|
}
|
|
|
|
case value_t::string:
|
|
{
|
|
if (add_prefix)
|
|
{
|
|
oa->write_character(static_cast<CharType>('S'));
|
|
}
|
|
write_number_with_ubjson_prefix(j.m_value.string->size(), true);
|
|
oa->write_characters(
|
|
reinterpret_cast<const CharType*>(j.m_value.string->c_str()),
|
|
j.m_value.string->size());
|
|
break;
|
|
}
|
|
|
|
case value_t::array:
|
|
{
|
|
if (add_prefix)
|
|
{
|
|
oa->write_character(static_cast<CharType>('['));
|
|
}
|
|
|
|
bool prefix_required = true;
|
|
if (use_type and not j.m_value.array->empty())
|
|
{
|
|
assert(use_count);
|
|
const CharType first_prefix = ubjson_prefix(j.front());
|
|
const bool same_prefix = std::all_of(j.begin() + 1, j.end(),
|
|
[this, first_prefix](const BasicJsonType & v)
|
|
{
|
|
return ubjson_prefix(v) == first_prefix;
|
|
});
|
|
|
|
if (same_prefix)
|
|
{
|
|
prefix_required = false;
|
|
oa->write_character(static_cast<CharType>('$'));
|
|
oa->write_character(first_prefix);
|
|
}
|
|
}
|
|
|
|
if (use_count)
|
|
{
|
|
oa->write_character(static_cast<CharType>('#'));
|
|
write_number_with_ubjson_prefix(j.m_value.array->size(), true);
|
|
}
|
|
|
|
for (const auto& el : *j.m_value.array)
|
|
{
|
|
write_ubjson(el, use_count, use_type, prefix_required);
|
|
}
|
|
|
|
if (not use_count)
|
|
{
|
|
oa->write_character(static_cast<CharType>(']'));
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
case value_t::object:
|
|
{
|
|
if (add_prefix)
|
|
{
|
|
oa->write_character(static_cast<CharType>('{'));
|
|
}
|
|
|
|
bool prefix_required = true;
|
|
if (use_type and not j.m_value.object->empty())
|
|
{
|
|
assert(use_count);
|
|
const CharType first_prefix = ubjson_prefix(j.front());
|
|
const bool same_prefix = std::all_of(j.begin(), j.end(),
|
|
[this, first_prefix](const BasicJsonType & v)
|
|
{
|
|
return ubjson_prefix(v) == first_prefix;
|
|
});
|
|
|
|
if (same_prefix)
|
|
{
|
|
prefix_required = false;
|
|
oa->write_character(static_cast<CharType>('$'));
|
|
oa->write_character(first_prefix);
|
|
}
|
|
}
|
|
|
|
if (use_count)
|
|
{
|
|
oa->write_character(static_cast<CharType>('#'));
|
|
write_number_with_ubjson_prefix(j.m_value.object->size(), true);
|
|
}
|
|
|
|
for (const auto& el : *j.m_value.object)
|
|
{
|
|
write_number_with_ubjson_prefix(el.first.size(), true);
|
|
oa->write_characters(
|
|
reinterpret_cast<const CharType*>(el.first.c_str()),
|
|
el.first.size());
|
|
write_ubjson(el.second, use_count, use_type, prefix_required);
|
|
}
|
|
|
|
if (not use_count)
|
|
{
|
|
oa->write_character(static_cast<CharType>('}'));
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
std::size_t write_bson_boolean(const typename BasicJsonType::string_t& name, const BasicJsonType& j)
|
|
{
|
|
oa->write_character(static_cast<CharType>(0x08)); // boolean
|
|
oa->write_characters(
|
|
reinterpret_cast<const CharType*>(name.c_str()),
|
|
name.size() + 1u);
|
|
oa->write_character(j.m_value.boolean ? static_cast<CharType>(0x01) : static_cast<CharType>(0x00));
|
|
return /*id*/ 1ul + name.size() + 1u + /*boolean value*/ 1u;
|
|
}
|
|
|
|
std::size_t write_bson_double(const typename BasicJsonType::string_t& name, const BasicJsonType& j)
|
|
{
|
|
oa->write_character(static_cast<CharType>(0x01)); // boolean
|
|
oa->write_characters(
|
|
reinterpret_cast<const CharType*>(name.c_str()),
|
|
name.size() + 1u);
|
|
write_number_little_endian(j.m_value.number_float);
|
|
return /*id*/ 1ul + name.size() + 1u + /*double value*/ 8u;
|
|
}
|
|
|
|
std::size_t write_bson_object_entry(const typename BasicJsonType::string_t& name, const BasicJsonType& j)
|
|
{
|
|
switch (j.type())
|
|
{
|
|
default:
|
|
JSON_THROW(type_error::create(317, "JSON value cannot be serialized to requested format"));
|
|
break;
|
|
case value_t::boolean:
|
|
return write_bson_boolean(name, j);
|
|
case value_t::number_float:
|
|
return write_bson_double(name, j);
|
|
};
|
|
|
|
return 0ul;
|
|
}
|
|
|
|
/*!
|
|
@param[in] j JSON value to serialize
|
|
@pre j.type() == value_t::object
|
|
*/
|
|
void write_bson_object(const BasicJsonType& j)
|
|
{
|
|
assert(j.type() == value_t::object);
|
|
auto document_size_offset = oa->reserve_characters(4ul);
|
|
std::int32_t document_size = 5ul;
|
|
|
|
for (const auto& el : *j.m_value.object)
|
|
{
|
|
document_size += write_bson_object_entry(el.first, el.second);
|
|
}
|
|
|
|
oa->write_character(static_cast<CharType>(0x00));
|
|
write_number_little_endian_at(document_size_offset, document_size);
|
|
}
|
|
|
|
/*!
|
|
@param[in] j JSON value to serialize
|
|
@pre j.type() == value_t::object
|
|
*/
|
|
void write_bson(const BasicJsonType& j)
|
|
{
|
|
switch (j.type())
|
|
{
|
|
default:
|
|
JSON_THROW(type_error::create(317, "JSON value cannot be serialized to requested format"));
|
|
break;
|
|
case value_t::discarded:
|
|
break;
|
|
case value_t::object:
|
|
write_bson_object(j);
|
|
break;
|
|
}
|
|
}
|
|
|
|
|
|
private:
|
|
/*
|
|
@brief write a number to output input
|
|
|
|
@param[in] n number of type @a NumberType
|
|
@tparam NumberType the type of the number
|
|
|
|
@note This function needs to respect the system's endianess, because bytes
|
|
in CBOR, MessagePack, and UBJSON are stored in network order (big
|
|
endian) and therefore need reordering on little endian systems.
|
|
*/
|
|
template<typename NumberType>
|
|
void write_number(const NumberType n)
|
|
{
|
|
// step 1: write number to array of length NumberType
|
|
std::array<CharType, sizeof(NumberType)> vec;
|
|
std::memcpy(vec.data(), &n, sizeof(NumberType));
|
|
|
|
// step 2: write array to output (with possible reordering)
|
|
if (is_little_endian)
|
|
{
|
|
// reverse byte order prior to conversion if necessary
|
|
std::reverse(vec.begin(), vec.end());
|
|
}
|
|
|
|
oa->write_characters(vec.data(), sizeof(NumberType));
|
|
}
|
|
|
|
/*
|
|
@brief write a number to output in little endian format
|
|
|
|
@param[in] n number of type @a NumberType
|
|
@tparam NumberType the type of the number
|
|
*/
|
|
template<typename NumberType>
|
|
void write_number_little_endian(const NumberType n)
|
|
{
|
|
// step 1: write number to array of length NumberType
|
|
std::array<CharType, sizeof(NumberType)> vec;
|
|
std::memcpy(vec.data(), &n, sizeof(NumberType));
|
|
|
|
// step 2: write array to output (with possible reordering)
|
|
if (!is_little_endian)
|
|
{
|
|
// reverse byte order prior to conversion if necessary
|
|
std::reverse(vec.begin(), vec.end());
|
|
}
|
|
|
|
oa->write_characters(vec.data(), sizeof(NumberType));
|
|
}
|
|
|
|
/*
|
|
@brief write a number to output in little endian format
|
|
|
|
@param[in] offset The offset where to start writing
|
|
@param[in] n number of type @a NumberType
|
|
@tparam NumberType the type of the number
|
|
*/
|
|
template<typename NumberType>
|
|
void write_number_little_endian_at(std::size_t offset, const NumberType n)
|
|
{
|
|
// step 1: write number to array of length NumberType
|
|
std::array<CharType, sizeof(NumberType)> vec;
|
|
std::memcpy(vec.data(), &n, sizeof(NumberType));
|
|
|
|
// step 2: write array to output (with possible reordering)
|
|
if (!is_little_endian)
|
|
{
|
|
// reverse byte order prior to conversion if necessary
|
|
std::reverse(vec.begin(), vec.end());
|
|
}
|
|
|
|
oa->write_characters_at(offset, vec.data(), sizeof(NumberType));
|
|
}
|
|
|
|
|
|
// UBJSON: write number (floating point)
|
|
template<typename NumberType, typename std::enable_if<
|
|
std::is_floating_point<NumberType>::value, int>::type = 0>
|
|
void write_number_with_ubjson_prefix(const NumberType n,
|
|
const bool add_prefix)
|
|
{
|
|
if (add_prefix)
|
|
{
|
|
oa->write_character(get_ubjson_float_prefix(n));
|
|
}
|
|
write_number(n);
|
|
}
|
|
|
|
// UBJSON: write number (unsigned integer)
|
|
template<typename NumberType, typename std::enable_if<
|
|
std::is_unsigned<NumberType>::value, int>::type = 0>
|
|
void write_number_with_ubjson_prefix(const NumberType n,
|
|
const bool add_prefix)
|
|
{
|
|
if (n <= static_cast<uint64_t>((std::numeric_limits<int8_t>::max)()))
|
|
{
|
|
if (add_prefix)
|
|
{
|
|
oa->write_character(static_cast<CharType>('i')); // int8
|
|
}
|
|
write_number(static_cast<uint8_t>(n));
|
|
}
|
|
else if (n <= (std::numeric_limits<uint8_t>::max)())
|
|
{
|
|
if (add_prefix)
|
|
{
|
|
oa->write_character(static_cast<CharType>('U')); // uint8
|
|
}
|
|
write_number(static_cast<uint8_t>(n));
|
|
}
|
|
else if (n <= static_cast<uint64_t>((std::numeric_limits<int16_t>::max)()))
|
|
{
|
|
if (add_prefix)
|
|
{
|
|
oa->write_character(static_cast<CharType>('I')); // int16
|
|
}
|
|
write_number(static_cast<int16_t>(n));
|
|
}
|
|
else if (n <= static_cast<uint64_t>((std::numeric_limits<int32_t>::max)()))
|
|
{
|
|
if (add_prefix)
|
|
{
|
|
oa->write_character(static_cast<CharType>('l')); // int32
|
|
}
|
|
write_number(static_cast<int32_t>(n));
|
|
}
|
|
else if (n <= static_cast<uint64_t>((std::numeric_limits<int64_t>::max)()))
|
|
{
|
|
if (add_prefix)
|
|
{
|
|
oa->write_character(static_cast<CharType>('L')); // int64
|
|
}
|
|
write_number(static_cast<int64_t>(n));
|
|
}
|
|
else
|
|
{
|
|
JSON_THROW(out_of_range::create(407, "number overflow serializing " + std::to_string(n)));
|
|
}
|
|
}
|
|
|
|
// UBJSON: write number (signed integer)
|
|
template<typename NumberType, typename std::enable_if<
|
|
std::is_signed<NumberType>::value and
|
|
not std::is_floating_point<NumberType>::value, int>::type = 0>
|
|
void write_number_with_ubjson_prefix(const NumberType n,
|
|
const bool add_prefix)
|
|
{
|
|
if ((std::numeric_limits<int8_t>::min)() <= n and n <= (std::numeric_limits<int8_t>::max)())
|
|
{
|
|
if (add_prefix)
|
|
{
|
|
oa->write_character(static_cast<CharType>('i')); // int8
|
|
}
|
|
write_number(static_cast<int8_t>(n));
|
|
}
|
|
else if (static_cast<int64_t>((std::numeric_limits<uint8_t>::min)()) <= n and n <= static_cast<int64_t>((std::numeric_limits<uint8_t>::max)()))
|
|
{
|
|
if (add_prefix)
|
|
{
|
|
oa->write_character(static_cast<CharType>('U')); // uint8
|
|
}
|
|
write_number(static_cast<uint8_t>(n));
|
|
}
|
|
else if ((std::numeric_limits<int16_t>::min)() <= n and n <= (std::numeric_limits<int16_t>::max)())
|
|
{
|
|
if (add_prefix)
|
|
{
|
|
oa->write_character(static_cast<CharType>('I')); // int16
|
|
}
|
|
write_number(static_cast<int16_t>(n));
|
|
}
|
|
else if ((std::numeric_limits<int32_t>::min)() <= n and n <= (std::numeric_limits<int32_t>::max)())
|
|
{
|
|
if (add_prefix)
|
|
{
|
|
oa->write_character(static_cast<CharType>('l')); // int32
|
|
}
|
|
write_number(static_cast<int32_t>(n));
|
|
}
|
|
else if ((std::numeric_limits<int64_t>::min)() <= n and n <= (std::numeric_limits<int64_t>::max)())
|
|
{
|
|
if (add_prefix)
|
|
{
|
|
oa->write_character(static_cast<CharType>('L')); // int64
|
|
}
|
|
write_number(static_cast<int64_t>(n));
|
|
}
|
|
// LCOV_EXCL_START
|
|
else
|
|
{
|
|
JSON_THROW(out_of_range::create(407, "number overflow serializing " + std::to_string(n)));
|
|
}
|
|
// LCOV_EXCL_STOP
|
|
}
|
|
|
|
/*!
|
|
@brief determine the type prefix of container values
|
|
|
|
@note This function does not need to be 100% accurate when it comes to
|
|
integer limits. In case a number exceeds the limits of int64_t,
|
|
this will be detected by a later call to function
|
|
write_number_with_ubjson_prefix. Therefore, we return 'L' for any
|
|
value that does not fit the previous limits.
|
|
*/
|
|
CharType ubjson_prefix(const BasicJsonType& j) const noexcept
|
|
{
|
|
switch (j.type())
|
|
{
|
|
case value_t::null:
|
|
return 'Z';
|
|
|
|
case value_t::boolean:
|
|
return j.m_value.boolean ? 'T' : 'F';
|
|
|
|
case value_t::number_integer:
|
|
{
|
|
if ((std::numeric_limits<int8_t>::min)() <= j.m_value.number_integer and j.m_value.number_integer <= (std::numeric_limits<int8_t>::max)())
|
|
{
|
|
return 'i';
|
|
}
|
|
else if ((std::numeric_limits<uint8_t>::min)() <= j.m_value.number_integer and j.m_value.number_integer <= (std::numeric_limits<uint8_t>::max)())
|
|
{
|
|
return 'U';
|
|
}
|
|
else if ((std::numeric_limits<int16_t>::min)() <= j.m_value.number_integer and j.m_value.number_integer <= (std::numeric_limits<int16_t>::max)())
|
|
{
|
|
return 'I';
|
|
}
|
|
else if ((std::numeric_limits<int32_t>::min)() <= j.m_value.number_integer and j.m_value.number_integer <= (std::numeric_limits<int32_t>::max)())
|
|
{
|
|
return 'l';
|
|
}
|
|
else // no check and assume int64_t (see note above)
|
|
{
|
|
return 'L';
|
|
}
|
|
}
|
|
|
|
case value_t::number_unsigned:
|
|
{
|
|
if (j.m_value.number_unsigned <= (std::numeric_limits<int8_t>::max)())
|
|
{
|
|
return 'i';
|
|
}
|
|
else if (j.m_value.number_unsigned <= (std::numeric_limits<uint8_t>::max)())
|
|
{
|
|
return 'U';
|
|
}
|
|
else if (j.m_value.number_unsigned <= (std::numeric_limits<int16_t>::max)())
|
|
{
|
|
return 'I';
|
|
}
|
|
else if (j.m_value.number_unsigned <= (std::numeric_limits<int32_t>::max)())
|
|
{
|
|
return 'l';
|
|
}
|
|
else // no check and assume int64_t (see note above)
|
|
{
|
|
return 'L';
|
|
}
|
|
}
|
|
|
|
case value_t::number_float:
|
|
return get_ubjson_float_prefix(j.m_value.number_float);
|
|
|
|
case value_t::string:
|
|
return 'S';
|
|
|
|
case value_t::array:
|
|
return '[';
|
|
|
|
case value_t::object:
|
|
return '{';
|
|
|
|
default: // discarded values
|
|
return 'N';
|
|
}
|
|
}
|
|
|
|
static constexpr CharType get_cbor_float_prefix(float)
|
|
{
|
|
return static_cast<CharType>(0xFA); // Single-Precision Float
|
|
}
|
|
|
|
static constexpr CharType get_cbor_float_prefix(double)
|
|
{
|
|
return static_cast<CharType>(0xFB); // Double-Precision Float
|
|
}
|
|
|
|
static constexpr CharType get_msgpack_float_prefix(float)
|
|
{
|
|
return static_cast<CharType>(0xCA); // float 32
|
|
}
|
|
|
|
static constexpr CharType get_msgpack_float_prefix(double)
|
|
{
|
|
return static_cast<CharType>(0xCB); // float 64
|
|
}
|
|
|
|
static constexpr CharType get_ubjson_float_prefix(float)
|
|
{
|
|
return 'd'; // float 32
|
|
}
|
|
|
|
static constexpr CharType get_ubjson_float_prefix(double)
|
|
{
|
|
return 'D'; // float 64
|
|
}
|
|
|
|
private:
|
|
/// whether we can assume little endianess
|
|
const bool is_little_endian = binary_reader<BasicJsonType>::little_endianess();
|
|
|
|
/// the output
|
|
output_adapter_t<CharType> oa = nullptr;
|
|
};
|
|
}
|
|
}
|