mirror of
https://github.com/nlohmann/json.git
synced 2024-12-14 05:29:08 +08:00
1689 lines
46 KiB
C++
1689 lines
46 KiB
C++
#pragma once
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#include <algorithm> // generate_n
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#include <array> // array
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#include <cassert> // assert
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#include <cmath> // ldexp
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#include <cstddef> // size_t
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#include <cstdint> // uint8_t, uint16_t, uint32_t, uint64_t
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#include <cstdio> // snprintf
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#include <cstring> // memcpy
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#include <iterator> // back_inserter
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#include <limits> // numeric_limits
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#include <string> // char_traits, string
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#include <utility> // make_pair, move
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#include <nlohmann/detail/input/input_adapters.hpp>
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#include <nlohmann/detail/input/json_sax.hpp>
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#include <nlohmann/detail/exceptions.hpp>
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#include <nlohmann/detail/macro_scope.hpp>
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#include <nlohmann/detail/value_t.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 reader //
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///////////////////
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/*!
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@brief deserialization of CBOR, MessagePack, and UBJSON values
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*/
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template<typename BasicJsonType>
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class binary_reader
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{
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using number_integer_t = typename BasicJsonType::number_integer_t;
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using number_unsigned_t = typename BasicJsonType::number_unsigned_t;
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using string_t = typename BasicJsonType::string_t;
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using json_sax_t = json_sax<BasicJsonType>;
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public:
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/*!
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@brief create a binary reader
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@param[in] adapter input adapter to read from
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*/
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explicit binary_reader(input_adapter_t adapter) : ia(std::move(adapter))
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{
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assert(ia);
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}
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/*!
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@param[in] format the binary format to parse
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@param[in] sax_ a SAX event processor
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@param[in] strict whether to expect the input to be consumed completed
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@return
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*/
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bool sax_parse(const input_format_t format,
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json_sax_t* sax_,
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const bool strict = true)
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{
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sax = sax_;
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bool result;
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switch (format)
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{
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case input_format_t::cbor:
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result = parse_cbor_internal();
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break;
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case input_format_t::msgpack:
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result = parse_msgpack_internal();
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break;
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case input_format_t::ubjson:
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result = parse_ubjson_internal();
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break;
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default:
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assert(false); // LCOV_EXCL_LINE
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}
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// strict mode: next byte must be EOF
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if (result and strict)
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{
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if (format == input_format_t::ubjson)
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{
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get_ignore_noop();
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}
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else
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{
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get();
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}
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if (JSON_UNLIKELY(current != std::char_traits<char>::eof()))
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{
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return sax->parse_error(chars_read, get_token_string(), parse_error::create(110, chars_read, "expected end of input"));
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}
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}
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return result;
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}
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/*!
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@brief determine system byte order
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@return true if and only if system's byte order is little endian
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@note from http://stackoverflow.com/a/1001328/266378
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*/
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static constexpr bool little_endianess(int num = 1) noexcept
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{
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return (*reinterpret_cast<char*>(&num) == 1);
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}
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private:
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/*!
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@param[in] get_char whether a new character should be retrieved from the
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input (true, default) or whether the last read
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character should be considered instead
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@return whether a valid CBOR value was passed to the SAX parser
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*/
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bool parse_cbor_internal(const bool get_char = true)
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{
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switch (get_char ? get() : current)
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{
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// EOF
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case std::char_traits<char>::eof():
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return unexpect_eof();
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// Integer 0x00..0x17 (0..23)
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case 0x00:
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case 0x01:
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case 0x02:
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case 0x03:
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case 0x04:
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case 0x05:
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case 0x06:
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case 0x07:
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case 0x08:
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case 0x09:
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case 0x0A:
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case 0x0B:
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case 0x0C:
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case 0x0D:
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case 0x0E:
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case 0x0F:
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case 0x10:
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case 0x11:
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case 0x12:
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case 0x13:
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case 0x14:
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case 0x15:
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case 0x16:
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case 0x17:
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return sax->number_unsigned(static_cast<number_unsigned_t>(current));
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case 0x18: // Unsigned integer (one-byte uint8_t follows)
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{
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uint8_t number;
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return get_number(number) and sax->number_unsigned(number);
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}
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case 0x19: // Unsigned integer (two-byte uint16_t follows)
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{
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uint16_t number;
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return get_number(number) and sax->number_unsigned(number);
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}
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case 0x1A: // Unsigned integer (four-byte uint32_t follows)
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{
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uint32_t number;
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return get_number(number) and sax->number_unsigned(number);
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}
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case 0x1B: // Unsigned integer (eight-byte uint64_t follows)
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{
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uint64_t number;
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return get_number(number) and sax->number_unsigned(number);
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}
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// Negative integer -1-0x00..-1-0x17 (-1..-24)
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case 0x20:
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case 0x21:
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case 0x22:
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case 0x23:
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case 0x24:
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case 0x25:
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case 0x26:
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case 0x27:
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case 0x28:
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case 0x29:
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case 0x2A:
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case 0x2B:
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case 0x2C:
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case 0x2D:
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case 0x2E:
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case 0x2F:
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case 0x30:
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case 0x31:
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case 0x32:
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case 0x33:
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case 0x34:
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case 0x35:
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case 0x36:
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case 0x37:
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return sax->number_integer(static_cast<int8_t>(0x20 - 1 - current));
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case 0x38: // Negative integer (one-byte uint8_t follows)
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{
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uint8_t number;
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return get_number(number) and sax->number_integer(static_cast<number_integer_t>(-1) - number);
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}
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case 0x39: // Negative integer -1-n (two-byte uint16_t follows)
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{
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uint16_t number;
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return get_number(number) and sax->number_integer(static_cast<number_integer_t>(-1) - number);
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}
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case 0x3A: // Negative integer -1-n (four-byte uint32_t follows)
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{
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uint32_t number;
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return get_number(number) and sax->number_integer(static_cast<number_integer_t>(-1) - number);
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}
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case 0x3B: // Negative integer -1-n (eight-byte uint64_t follows)
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{
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uint64_t number;
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return get_number(number) and sax->number_integer(static_cast<number_integer_t>(-1)
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- static_cast<number_integer_t>(number));
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}
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// UTF-8 string (0x00..0x17 bytes follow)
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case 0x60:
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case 0x61:
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case 0x62:
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case 0x63:
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case 0x64:
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case 0x65:
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case 0x66:
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case 0x67:
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case 0x68:
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case 0x69:
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case 0x6A:
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case 0x6B:
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case 0x6C:
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case 0x6D:
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case 0x6E:
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case 0x6F:
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case 0x70:
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case 0x71:
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case 0x72:
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case 0x73:
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case 0x74:
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case 0x75:
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case 0x76:
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case 0x77:
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case 0x78: // UTF-8 string (one-byte uint8_t for n follows)
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case 0x79: // UTF-8 string (two-byte uint16_t for n follow)
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case 0x7A: // UTF-8 string (four-byte uint32_t for n follow)
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case 0x7B: // UTF-8 string (eight-byte uint64_t for n follow)
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case 0x7F: // UTF-8 string (indefinite length)
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{
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string_t s;
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return get_cbor_string(s) and sax->string(s);
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}
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// array (0x00..0x17 data items follow)
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case 0x80:
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case 0x81:
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case 0x82:
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case 0x83:
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case 0x84:
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case 0x85:
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case 0x86:
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case 0x87:
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case 0x88:
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case 0x89:
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case 0x8A:
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case 0x8B:
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case 0x8C:
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case 0x8D:
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case 0x8E:
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case 0x8F:
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case 0x90:
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case 0x91:
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case 0x92:
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case 0x93:
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case 0x94:
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case 0x95:
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case 0x96:
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case 0x97:
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return get_cbor_array(static_cast<std::size_t>(current & 0x1F));
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case 0x98: // array (one-byte uint8_t for n follows)
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{
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uint8_t len;
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return get_number(len) and get_cbor_array(static_cast<std::size_t>(len));
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}
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case 0x99: // array (two-byte uint16_t for n follow)
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{
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uint16_t len;
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return get_number(len) and get_cbor_array(static_cast<std::size_t>(len));
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}
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case 0x9A: // array (four-byte uint32_t for n follow)
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{
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uint32_t len;
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return get_number(len) and get_cbor_array(static_cast<std::size_t>(len));
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}
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case 0x9B: // array (eight-byte uint64_t for n follow)
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{
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uint64_t len;
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return get_number(len) and get_cbor_array(static_cast<std::size_t>(len));
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}
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case 0x9F: // array (indefinite length)
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return get_cbor_array(json_sax_t::no_limit);
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// map (0x00..0x17 pairs of data items follow)
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case 0xA0:
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case 0xA1:
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case 0xA2:
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case 0xA3:
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case 0xA4:
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case 0xA5:
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case 0xA6:
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case 0xA7:
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case 0xA8:
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case 0xA9:
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case 0xAA:
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case 0xAB:
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case 0xAC:
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case 0xAD:
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case 0xAE:
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case 0xAF:
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case 0xB0:
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case 0xB1:
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case 0xB2:
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case 0xB3:
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case 0xB4:
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case 0xB5:
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case 0xB6:
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case 0xB7:
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return get_cbor_object(static_cast<std::size_t>(current & 0x1F));
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case 0xB8: // map (one-byte uint8_t for n follows)
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{
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uint8_t len;
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return get_number(len) and get_cbor_object(static_cast<std::size_t>(len));
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}
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case 0xB9: // map (two-byte uint16_t for n follow)
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{
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uint16_t len;
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return get_number(len) and get_cbor_object(static_cast<std::size_t>(len));
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}
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case 0xBA: // map (four-byte uint32_t for n follow)
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{
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uint32_t len;
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return get_number(len) and get_cbor_object(static_cast<std::size_t>(len));
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}
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case 0xBB: // map (eight-byte uint64_t for n follow)
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{
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uint64_t len;
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return get_number(len) and get_cbor_object(static_cast<std::size_t>(len));
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}
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case 0xBF: // map (indefinite length)
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return get_cbor_object(json_sax_t::no_limit);
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case 0xF4: // false
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return sax->boolean(false);
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case 0xF5: // true
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return sax->boolean(true);
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case 0xF6: // null
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return sax->null();
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case 0xF9: // Half-Precision Float (two-byte IEEE 754)
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{
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const int byte1 = get();
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if (JSON_UNLIKELY(not unexpect_eof()))
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{
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return false;
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}
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const int byte2 = get();
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if (JSON_UNLIKELY(not unexpect_eof()))
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{
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return false;
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}
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// code from RFC 7049, Appendix D, Figure 3:
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// As half-precision floating-point numbers were only added
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// to IEEE 754 in 2008, today's programming platforms often
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// still only have limited support for them. It is very
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// easy to include at least decoding support for them even
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// without such support. An example of a small decoder for
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// half-precision floating-point numbers in the C language
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// is shown in Fig. 3.
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const int half = (byte1 << 8) + byte2;
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const int exp = (half >> 10) & 0x1F;
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const int mant = half & 0x3FF;
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double val;
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if (exp == 0)
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{
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val = std::ldexp(mant, -24);
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}
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else if (exp != 31)
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{
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val = std::ldexp(mant + 1024, exp - 25);
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}
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else
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{
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val = (mant == 0) ? std::numeric_limits<double>::infinity()
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: std::numeric_limits<double>::quiet_NaN();
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}
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return sax->number_float((half & 0x8000) != 0 ? -val : val, "");
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}
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case 0xFA: // Single-Precision Float (four-byte IEEE 754)
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{
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float number;
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return get_number(number) and sax->number_float(static_cast<double>(number), "");
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}
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case 0xFB: // Double-Precision Float (eight-byte IEEE 754)
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{
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double number;
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return get_number(number) and sax->number_float(number, "");
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}
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default: // anything else (0xFF is handled inside the other types)
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{
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auto last_token = get_token_string();
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return sax->parse_error(chars_read, last_token, parse_error::create(112, chars_read, "error reading CBOR; last byte: 0x" + last_token));
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}
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}
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}
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|
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/*!
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@return whether a valid MessagePack value was passed to the SAX parser
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*/
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bool parse_msgpack_internal()
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{
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switch (get())
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{
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// EOF
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case std::char_traits<char>::eof():
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return unexpect_eof();
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// positive fixint
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case 0x00:
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case 0x01:
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case 0x02:
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case 0x03:
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case 0x04:
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case 0x05:
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case 0x06:
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case 0x07:
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case 0x08:
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case 0x09:
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case 0x0A:
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case 0x0B:
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case 0x0C:
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case 0x0D:
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case 0x0E:
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case 0x0F:
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case 0x10:
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case 0x11:
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case 0x12:
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case 0x13:
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case 0x14:
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case 0x15:
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case 0x16:
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case 0x17:
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case 0x18:
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case 0x19:
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case 0x1A:
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case 0x1B:
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case 0x1C:
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case 0x1D:
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case 0x1E:
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case 0x1F:
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case 0x20:
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case 0x21:
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case 0x22:
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case 0x23:
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case 0x24:
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case 0x25:
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case 0x26:
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case 0x27:
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case 0x28:
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case 0x29:
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case 0x2A:
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case 0x2B:
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case 0x2C:
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case 0x2D:
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case 0x2E:
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case 0x2F:
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case 0x30:
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case 0x31:
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case 0x32:
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case 0x33:
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case 0x34:
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case 0x35:
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case 0x36:
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case 0x37:
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case 0x38:
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case 0x39:
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case 0x3A:
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case 0x3B:
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case 0x3C:
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case 0x3D:
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case 0x3E:
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case 0x3F:
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case 0x40:
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case 0x41:
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case 0x42:
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case 0x43:
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case 0x44:
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case 0x45:
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case 0x46:
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case 0x47:
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case 0x48:
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case 0x49:
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case 0x4A:
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case 0x4B:
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case 0x4C:
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case 0x4D:
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case 0x4E:
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case 0x4F:
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case 0x50:
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case 0x51:
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case 0x52:
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case 0x53:
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case 0x54:
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case 0x55:
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case 0x56:
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case 0x57:
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case 0x58:
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case 0x59:
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case 0x5A:
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case 0x5B:
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case 0x5C:
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case 0x5D:
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case 0x5E:
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case 0x5F:
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case 0x60:
|
|
case 0x61:
|
|
case 0x62:
|
|
case 0x63:
|
|
case 0x64:
|
|
case 0x65:
|
|
case 0x66:
|
|
case 0x67:
|
|
case 0x68:
|
|
case 0x69:
|
|
case 0x6A:
|
|
case 0x6B:
|
|
case 0x6C:
|
|
case 0x6D:
|
|
case 0x6E:
|
|
case 0x6F:
|
|
case 0x70:
|
|
case 0x71:
|
|
case 0x72:
|
|
case 0x73:
|
|
case 0x74:
|
|
case 0x75:
|
|
case 0x76:
|
|
case 0x77:
|
|
case 0x78:
|
|
case 0x79:
|
|
case 0x7A:
|
|
case 0x7B:
|
|
case 0x7C:
|
|
case 0x7D:
|
|
case 0x7E:
|
|
case 0x7F:
|
|
return sax->number_unsigned(static_cast<number_unsigned_t>(current));
|
|
|
|
// fixmap
|
|
case 0x80:
|
|
case 0x81:
|
|
case 0x82:
|
|
case 0x83:
|
|
case 0x84:
|
|
case 0x85:
|
|
case 0x86:
|
|
case 0x87:
|
|
case 0x88:
|
|
case 0x89:
|
|
case 0x8A:
|
|
case 0x8B:
|
|
case 0x8C:
|
|
case 0x8D:
|
|
case 0x8E:
|
|
case 0x8F:
|
|
return get_msgpack_object(static_cast<std::size_t>(current & 0x0F));
|
|
|
|
// fixarray
|
|
case 0x90:
|
|
case 0x91:
|
|
case 0x92:
|
|
case 0x93:
|
|
case 0x94:
|
|
case 0x95:
|
|
case 0x96:
|
|
case 0x97:
|
|
case 0x98:
|
|
case 0x99:
|
|
case 0x9A:
|
|
case 0x9B:
|
|
case 0x9C:
|
|
case 0x9D:
|
|
case 0x9E:
|
|
case 0x9F:
|
|
return get_msgpack_array(static_cast<std::size_t>(current & 0x0F));
|
|
|
|
// fixstr
|
|
case 0xA0:
|
|
case 0xA1:
|
|
case 0xA2:
|
|
case 0xA3:
|
|
case 0xA4:
|
|
case 0xA5:
|
|
case 0xA6:
|
|
case 0xA7:
|
|
case 0xA8:
|
|
case 0xA9:
|
|
case 0xAA:
|
|
case 0xAB:
|
|
case 0xAC:
|
|
case 0xAD:
|
|
case 0xAE:
|
|
case 0xAF:
|
|
case 0xB0:
|
|
case 0xB1:
|
|
case 0xB2:
|
|
case 0xB3:
|
|
case 0xB4:
|
|
case 0xB5:
|
|
case 0xB6:
|
|
case 0xB7:
|
|
case 0xB8:
|
|
case 0xB9:
|
|
case 0xBA:
|
|
case 0xBB:
|
|
case 0xBC:
|
|
case 0xBD:
|
|
case 0xBE:
|
|
case 0xBF:
|
|
{
|
|
string_t s;
|
|
return get_msgpack_string(s) and sax->string(s);
|
|
}
|
|
|
|
case 0xC0: // nil
|
|
return sax->null();
|
|
|
|
case 0xC2: // false
|
|
return sax->boolean(false);
|
|
|
|
case 0xC3: // true
|
|
return sax->boolean(true);
|
|
|
|
case 0xCA: // float 32
|
|
{
|
|
float number;
|
|
return get_number(number) and sax->number_float(static_cast<double>(number), "");
|
|
}
|
|
|
|
case 0xCB: // float 64
|
|
{
|
|
double number;
|
|
return get_number(number) and sax->number_float(number, "");
|
|
}
|
|
|
|
case 0xCC: // uint 8
|
|
{
|
|
uint8_t number;
|
|
return get_number(number) and sax->number_unsigned(number);
|
|
}
|
|
|
|
case 0xCD: // uint 16
|
|
{
|
|
uint16_t number;
|
|
return get_number(number) and sax->number_unsigned(number);
|
|
}
|
|
|
|
case 0xCE: // uint 32
|
|
{
|
|
uint32_t number;
|
|
return get_number(number) and sax->number_unsigned(number);
|
|
}
|
|
|
|
case 0xCF: // uint 64
|
|
{
|
|
uint64_t number;
|
|
return get_number(number) and sax->number_unsigned(number);
|
|
}
|
|
|
|
case 0xD0: // int 8
|
|
{
|
|
int8_t number;
|
|
return get_number(number) and sax->number_integer(number);
|
|
}
|
|
|
|
case 0xD1: // int 16
|
|
{
|
|
int16_t number;
|
|
return get_number(number) and sax->number_integer(number);
|
|
}
|
|
|
|
case 0xD2: // int 32
|
|
{
|
|
int32_t number;
|
|
return get_number(number) and sax->number_integer(number);
|
|
}
|
|
|
|
case 0xD3: // int 64
|
|
{
|
|
int64_t number;
|
|
return get_number(number) and sax->number_integer(number);
|
|
}
|
|
|
|
case 0xD9: // str 8
|
|
case 0xDA: // str 16
|
|
case 0xDB: // str 32
|
|
{
|
|
string_t s;
|
|
return get_msgpack_string(s) and sax->string(s);
|
|
}
|
|
|
|
case 0xDC: // array 16
|
|
{
|
|
uint16_t len;
|
|
return get_number(len) and get_msgpack_array(static_cast<std::size_t>(len));
|
|
}
|
|
|
|
case 0xDD: // array 32
|
|
{
|
|
uint32_t len;
|
|
return get_number(len) and get_msgpack_array(static_cast<std::size_t>(len));
|
|
}
|
|
|
|
case 0xDE: // map 16
|
|
{
|
|
uint16_t len;
|
|
return get_number(len) and get_msgpack_object(static_cast<std::size_t>(len));
|
|
}
|
|
|
|
case 0xDF: // map 32
|
|
{
|
|
uint32_t len;
|
|
return get_number(len) and get_msgpack_object(static_cast<std::size_t>(len));
|
|
}
|
|
|
|
// negative fixint
|
|
case 0xE0:
|
|
case 0xE1:
|
|
case 0xE2:
|
|
case 0xE3:
|
|
case 0xE4:
|
|
case 0xE5:
|
|
case 0xE6:
|
|
case 0xE7:
|
|
case 0xE8:
|
|
case 0xE9:
|
|
case 0xEA:
|
|
case 0xEB:
|
|
case 0xEC:
|
|
case 0xED:
|
|
case 0xEE:
|
|
case 0xEF:
|
|
case 0xF0:
|
|
case 0xF1:
|
|
case 0xF2:
|
|
case 0xF3:
|
|
case 0xF4:
|
|
case 0xF5:
|
|
case 0xF6:
|
|
case 0xF7:
|
|
case 0xF8:
|
|
case 0xF9:
|
|
case 0xFA:
|
|
case 0xFB:
|
|
case 0xFC:
|
|
case 0xFD:
|
|
case 0xFE:
|
|
case 0xFF:
|
|
return sax->number_integer(static_cast<int8_t>(current));
|
|
|
|
default: // anything else
|
|
{
|
|
auto last_token = get_token_string();
|
|
return sax->parse_error(chars_read, last_token, parse_error::create(112, chars_read, "error reading MessagePack; last byte: 0x" + last_token));
|
|
}
|
|
}
|
|
}
|
|
|
|
/*!
|
|
@param[in] get_char whether a new character should be retrieved from the
|
|
input (true, default) or whether the last read
|
|
character should be considered instead
|
|
|
|
@return whether a valid UBJSON value was passed to the SAX parser
|
|
*/
|
|
bool parse_ubjson_internal(const bool get_char = true)
|
|
{
|
|
return get_ubjson_value(get_char ? get_ignore_noop() : current);
|
|
}
|
|
|
|
/*!
|
|
@brief get next character from the input
|
|
|
|
This function provides the interface to the used input adapter. It does
|
|
not throw in case the input reached EOF, but returns a -'ve valued
|
|
`std::char_traits<char>::eof()` in that case.
|
|
|
|
@return character read from the input
|
|
*/
|
|
int get()
|
|
{
|
|
++chars_read;
|
|
return (current = ia->get_character());
|
|
}
|
|
|
|
/*!
|
|
@return character read from the input after ignoring all 'N' entries
|
|
*/
|
|
int get_ignore_noop()
|
|
{
|
|
do
|
|
{
|
|
get();
|
|
}
|
|
while (current == 'N');
|
|
|
|
return current;
|
|
}
|
|
|
|
/*
|
|
@brief read a number from the input
|
|
|
|
@tparam NumberType the type of the number
|
|
@param[out] result number of type @a NumberType
|
|
|
|
@return whether conversion completed
|
|
|
|
@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>
|
|
bool get_number(NumberType& result)
|
|
{
|
|
// step 1: read input into array with system's byte order
|
|
std::array<uint8_t, sizeof(NumberType)> vec;
|
|
for (std::size_t i = 0; i < sizeof(NumberType); ++i)
|
|
{
|
|
get();
|
|
if (JSON_UNLIKELY(not unexpect_eof()))
|
|
{
|
|
return false;
|
|
}
|
|
|
|
// reverse byte order prior to conversion if necessary
|
|
if (is_little_endian)
|
|
{
|
|
vec[sizeof(NumberType) - i - 1] = static_cast<uint8_t>(current);
|
|
}
|
|
else
|
|
{
|
|
vec[i] = static_cast<uint8_t>(current); // LCOV_EXCL_LINE
|
|
}
|
|
}
|
|
|
|
// step 2: convert array into number of type T and return
|
|
std::memcpy(&result, vec.data(), sizeof(NumberType));
|
|
return true;
|
|
}
|
|
|
|
/*!
|
|
@brief create a string by reading characters from the input
|
|
|
|
@tparam NumberType the type of the number
|
|
@param[in] len number of characters to read
|
|
@param[out] string created by reading @a len bytes
|
|
|
|
@return whether string creation completed
|
|
|
|
@note We can not reserve @a len bytes for the result, because @a len
|
|
may be too large. Usually, @ref unexpect_eof() detects the end of
|
|
the input before we run out of string memory.
|
|
*/
|
|
template<typename NumberType>
|
|
bool get_string(const NumberType len, string_t& result)
|
|
{
|
|
bool success = true;
|
|
std::generate_n(std::back_inserter(result), len, [this, &success]()
|
|
{
|
|
get();
|
|
if (JSON_UNLIKELY(not unexpect_eof()))
|
|
{
|
|
success = false;
|
|
}
|
|
return static_cast<char>(current);
|
|
});
|
|
return success;
|
|
}
|
|
|
|
/*!
|
|
@brief reads a CBOR string
|
|
|
|
This function first reads starting bytes to determine the expected
|
|
string length and then copies this number of bytes into a string.
|
|
Additionally, CBOR's strings with indefinite lengths are supported.
|
|
|
|
@param[out] result created string
|
|
|
|
@return whether string creation completed
|
|
*/
|
|
bool get_cbor_string(string_t& result)
|
|
{
|
|
if (JSON_UNLIKELY(not unexpect_eof()))
|
|
{
|
|
return false;
|
|
}
|
|
|
|
switch (current)
|
|
{
|
|
// UTF-8 string (0x00..0x17 bytes follow)
|
|
case 0x60:
|
|
case 0x61:
|
|
case 0x62:
|
|
case 0x63:
|
|
case 0x64:
|
|
case 0x65:
|
|
case 0x66:
|
|
case 0x67:
|
|
case 0x68:
|
|
case 0x69:
|
|
case 0x6A:
|
|
case 0x6B:
|
|
case 0x6C:
|
|
case 0x6D:
|
|
case 0x6E:
|
|
case 0x6F:
|
|
case 0x70:
|
|
case 0x71:
|
|
case 0x72:
|
|
case 0x73:
|
|
case 0x74:
|
|
case 0x75:
|
|
case 0x76:
|
|
case 0x77:
|
|
{
|
|
return get_string(current & 0x1F, result);
|
|
}
|
|
|
|
case 0x78: // UTF-8 string (one-byte uint8_t for n follows)
|
|
{
|
|
uint8_t len;
|
|
return get_number(len) and get_string(len, result);
|
|
}
|
|
|
|
case 0x79: // UTF-8 string (two-byte uint16_t for n follow)
|
|
{
|
|
uint16_t len;
|
|
return get_number(len) and get_string(len, result);
|
|
}
|
|
|
|
case 0x7A: // UTF-8 string (four-byte uint32_t for n follow)
|
|
{
|
|
uint32_t len;
|
|
return get_number(len) and get_string(len, result);
|
|
}
|
|
|
|
case 0x7B: // UTF-8 string (eight-byte uint64_t for n follow)
|
|
{
|
|
uint64_t len;
|
|
return get_number(len) and get_string(len, result);
|
|
}
|
|
|
|
case 0x7F: // UTF-8 string (indefinite length)
|
|
{
|
|
while (get() != 0xFF)
|
|
{
|
|
string_t chunk;
|
|
if (not get_cbor_string(chunk))
|
|
{
|
|
return false;
|
|
}
|
|
result.append(chunk);
|
|
}
|
|
return true;
|
|
}
|
|
|
|
default:
|
|
{
|
|
auto last_token = get_token_string();
|
|
return sax->parse_error(chars_read, last_token, parse_error::create(113, chars_read, "expected a CBOR string; last byte: 0x" + last_token));
|
|
}
|
|
}
|
|
}
|
|
|
|
/*!
|
|
@param[in] len the length of the array or json_sax_t::no_limit for an
|
|
array of indefinite size
|
|
@return whether array creation completed
|
|
*/
|
|
bool get_cbor_array(const std::size_t len)
|
|
{
|
|
if (JSON_UNLIKELY(not sax->start_array(len)))
|
|
{
|
|
return false;
|
|
}
|
|
|
|
if (len != json_sax_t::no_limit)
|
|
for (std::size_t i = 0; i < len; ++i)
|
|
{
|
|
if (JSON_UNLIKELY(not parse_cbor_internal()))
|
|
{
|
|
return false;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
while (get() != 0xFF)
|
|
{
|
|
if (JSON_UNLIKELY(not parse_cbor_internal(false)))
|
|
{
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
|
|
return sax->end_array();
|
|
}
|
|
|
|
/*!
|
|
@param[in] len the length of the object or json_sax_t::no_limit for an
|
|
object of indefinite size
|
|
@return whether object creation completed
|
|
*/
|
|
bool get_cbor_object(const std::size_t len)
|
|
{
|
|
if (not JSON_UNLIKELY(sax->start_object(len)))
|
|
{
|
|
return false;
|
|
}
|
|
|
|
string_t key;
|
|
if (len != json_sax_t::no_limit)
|
|
{
|
|
for (std::size_t i = 0; i < len; ++i)
|
|
{
|
|
get();
|
|
if (JSON_UNLIKELY(not get_cbor_string(key) or not sax->key(key)))
|
|
{
|
|
return false;
|
|
}
|
|
|
|
if (JSON_UNLIKELY(not parse_cbor_internal()))
|
|
{
|
|
return false;
|
|
}
|
|
key.clear();
|
|
}
|
|
}
|
|
else
|
|
{
|
|
while (get() != 0xFF)
|
|
{
|
|
if (JSON_UNLIKELY(not get_cbor_string(key) or not sax->key(key)))
|
|
{
|
|
return false;
|
|
}
|
|
|
|
if (JSON_UNLIKELY(not parse_cbor_internal()))
|
|
{
|
|
return false;
|
|
}
|
|
key.clear();
|
|
}
|
|
}
|
|
|
|
return sax->end_object();
|
|
}
|
|
|
|
/*!
|
|
@brief reads a MessagePack string
|
|
|
|
This function first reads starting bytes to determine the expected
|
|
string length and then copies this number of bytes into a string.
|
|
|
|
@param[out] result created string
|
|
|
|
@return whether string creation completed
|
|
*/
|
|
bool get_msgpack_string(string_t& result)
|
|
{
|
|
if (JSON_UNLIKELY(not unexpect_eof()))
|
|
{
|
|
return false;
|
|
}
|
|
|
|
switch (current)
|
|
{
|
|
// fixstr
|
|
case 0xA0:
|
|
case 0xA1:
|
|
case 0xA2:
|
|
case 0xA3:
|
|
case 0xA4:
|
|
case 0xA5:
|
|
case 0xA6:
|
|
case 0xA7:
|
|
case 0xA8:
|
|
case 0xA9:
|
|
case 0xAA:
|
|
case 0xAB:
|
|
case 0xAC:
|
|
case 0xAD:
|
|
case 0xAE:
|
|
case 0xAF:
|
|
case 0xB0:
|
|
case 0xB1:
|
|
case 0xB2:
|
|
case 0xB3:
|
|
case 0xB4:
|
|
case 0xB5:
|
|
case 0xB6:
|
|
case 0xB7:
|
|
case 0xB8:
|
|
case 0xB9:
|
|
case 0xBA:
|
|
case 0xBB:
|
|
case 0xBC:
|
|
case 0xBD:
|
|
case 0xBE:
|
|
case 0xBF:
|
|
{
|
|
return get_string(current & 0x1F, result);
|
|
}
|
|
|
|
case 0xD9: // str 8
|
|
{
|
|
uint8_t len;
|
|
return get_number(len) and get_string(len, result);
|
|
}
|
|
|
|
case 0xDA: // str 16
|
|
{
|
|
uint16_t len;
|
|
return get_number(len) and get_string(len, result);
|
|
}
|
|
|
|
case 0xDB: // str 32
|
|
{
|
|
uint32_t len;
|
|
return get_number(len) and get_string(len, result);
|
|
}
|
|
|
|
default:
|
|
{
|
|
auto last_token = get_token_string();
|
|
return sax->parse_error(chars_read, last_token, parse_error::create(113, chars_read, "expected a MessagePack string; last byte: 0x" + last_token));
|
|
}
|
|
}
|
|
}
|
|
|
|
/*!
|
|
@param[in] len the length of the array
|
|
@return whether array creation completed
|
|
*/
|
|
bool get_msgpack_array(const std::size_t len)
|
|
{
|
|
if (JSON_UNLIKELY(not sax->start_array(len)))
|
|
{
|
|
return false;
|
|
}
|
|
|
|
for (std::size_t i = 0; i < len; ++i)
|
|
{
|
|
if (JSON_UNLIKELY(not parse_msgpack_internal()))
|
|
{
|
|
return false;
|
|
}
|
|
}
|
|
|
|
return sax->end_array();
|
|
}
|
|
|
|
/*!
|
|
@param[in] len the length of the object
|
|
@return whether object creation completed
|
|
*/
|
|
bool get_msgpack_object(const std::size_t len)
|
|
{
|
|
if (JSON_UNLIKELY(not sax->start_object(len)))
|
|
{
|
|
return false;
|
|
}
|
|
|
|
string_t key;
|
|
for (std::size_t i = 0; i < len; ++i)
|
|
{
|
|
get();
|
|
if (JSON_UNLIKELY(not get_msgpack_string(key) or not sax->key(key)))
|
|
{
|
|
return false;
|
|
}
|
|
|
|
if (JSON_UNLIKELY(not parse_msgpack_internal()))
|
|
{
|
|
return false;
|
|
}
|
|
key.clear();
|
|
}
|
|
|
|
return sax->end_object();
|
|
}
|
|
|
|
/*!
|
|
@brief reads a UBJSON string
|
|
|
|
This function is either called after reading the 'S' byte explicitly
|
|
indicating a string, or in case of an object key where the 'S' byte can be
|
|
left out.
|
|
|
|
@param[out] result created string
|
|
@param[in] get_char whether a new character should be retrieved from the
|
|
input (true, default) or whether the last read
|
|
character should be considered instead
|
|
|
|
@return whether string creation completed
|
|
*/
|
|
bool get_ubjson_string(string_t& result, const bool get_char = true)
|
|
{
|
|
if (get_char)
|
|
{
|
|
get(); // TODO: may we ignore N here?
|
|
}
|
|
|
|
if (JSON_UNLIKELY(not unexpect_eof()))
|
|
{
|
|
return false;
|
|
}
|
|
|
|
switch (current)
|
|
{
|
|
case 'U':
|
|
{
|
|
uint8_t len;
|
|
return get_number(len) and get_string(len, result);
|
|
}
|
|
|
|
case 'i':
|
|
{
|
|
int8_t len;
|
|
return get_number(len) and get_string(len, result);
|
|
}
|
|
|
|
case 'I':
|
|
{
|
|
int16_t len;
|
|
return get_number(len) and get_string(len, result);
|
|
}
|
|
|
|
case 'l':
|
|
{
|
|
int32_t len;
|
|
return get_number(len) and get_string(len, result);
|
|
}
|
|
|
|
case 'L':
|
|
{
|
|
int64_t len;
|
|
return get_number(len) and get_string(len, result);
|
|
}
|
|
|
|
default:
|
|
auto last_token = get_token_string();
|
|
return sax->parse_error(chars_read, last_token, parse_error::create(113, chars_read, "expected a UBJSON string; last byte: 0x" + last_token));
|
|
}
|
|
}
|
|
|
|
/*!
|
|
@param[out] result determined size
|
|
@return whether size determination completed
|
|
*/
|
|
bool get_ubjson_size_value(std::size_t& result)
|
|
{
|
|
switch (get_ignore_noop())
|
|
{
|
|
case 'U':
|
|
{
|
|
uint8_t number;
|
|
if (JSON_UNLIKELY(not get_number(number)))
|
|
{
|
|
return false;
|
|
}
|
|
result = static_cast<std::size_t>(number);
|
|
return true;
|
|
}
|
|
|
|
case 'i':
|
|
{
|
|
int8_t number;
|
|
if (JSON_UNLIKELY(not get_number(number)))
|
|
{
|
|
return false;
|
|
}
|
|
result = static_cast<std::size_t>(number);
|
|
return true;
|
|
}
|
|
|
|
case 'I':
|
|
{
|
|
int16_t number;
|
|
if (JSON_UNLIKELY(not get_number(number)))
|
|
{
|
|
return false;
|
|
}
|
|
result = static_cast<std::size_t>(number);
|
|
return true;
|
|
}
|
|
|
|
case 'l':
|
|
{
|
|
int32_t number;
|
|
if (JSON_UNLIKELY(not get_number(number)))
|
|
{
|
|
return false;
|
|
}
|
|
result = static_cast<std::size_t>(number);
|
|
return true;
|
|
}
|
|
|
|
case 'L':
|
|
{
|
|
int64_t number;
|
|
if (JSON_UNLIKELY(not get_number(number)))
|
|
{
|
|
return false;
|
|
}
|
|
result = static_cast<std::size_t>(number);
|
|
return true;
|
|
}
|
|
|
|
default:
|
|
{
|
|
auto last_token = get_token_string();
|
|
return sax->parse_error(chars_read, last_token, parse_error::create(113, chars_read, "byte after '#' must denote a number type; last byte: 0x" + last_token));
|
|
}
|
|
}
|
|
}
|
|
|
|
/*!
|
|
@brief determine the type and size for a container
|
|
|
|
In the optimized UBJSON format, a type and a size can be provided to allow
|
|
for a more compact representation.
|
|
|
|
@param[out] result pair of the size and the type
|
|
|
|
@return whether pair creation completed
|
|
*/
|
|
bool get_ubjson_size_type(std::pair<std::size_t, int>& result)
|
|
{
|
|
result.first = string_t::npos; // size
|
|
result.second = 0; // type
|
|
|
|
get_ignore_noop();
|
|
|
|
if (current == '$')
|
|
{
|
|
result.second = get(); // must not ignore 'N', because 'N' maybe the type
|
|
if (JSON_UNLIKELY(not unexpect_eof()))
|
|
{
|
|
return false;
|
|
}
|
|
|
|
get_ignore_noop();
|
|
if (JSON_UNLIKELY(current != '#'))
|
|
{
|
|
if (JSON_UNLIKELY(not unexpect_eof()))
|
|
{
|
|
return false;
|
|
}
|
|
auto last_token = get_token_string();
|
|
return sax->parse_error(chars_read, last_token, parse_error::create(112, chars_read, "expected '#' after UBJSON type information; last byte: 0x" + last_token));
|
|
}
|
|
|
|
return get_ubjson_size_value(result.first);
|
|
}
|
|
else if (current == '#')
|
|
{
|
|
return get_ubjson_size_value(result.first);
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/*!
|
|
@param prefix the previously read or set type prefix
|
|
@return whether value creation completed
|
|
*/
|
|
bool get_ubjson_value(const int prefix)
|
|
{
|
|
switch (prefix)
|
|
{
|
|
case std::char_traits<char>::eof(): // EOF
|
|
return unexpect_eof();
|
|
|
|
case 'T': // true
|
|
return sax->boolean(true);
|
|
case 'F': // false
|
|
return sax->boolean(false);
|
|
|
|
case 'Z': // null
|
|
return sax->null();
|
|
|
|
case 'U':
|
|
{
|
|
uint8_t number;
|
|
return get_number(number) and sax->number_unsigned(number);
|
|
}
|
|
|
|
case 'i':
|
|
{
|
|
int8_t number;
|
|
return get_number(number) and sax->number_integer(number);
|
|
}
|
|
|
|
case 'I':
|
|
{
|
|
int16_t number;
|
|
return get_number(number) and sax->number_integer(number);
|
|
}
|
|
|
|
case 'l':
|
|
{
|
|
int32_t number;
|
|
return get_number(number) and sax->number_integer(number);
|
|
}
|
|
|
|
case 'L':
|
|
{
|
|
int64_t number;
|
|
return get_number(number) and sax->number_integer(number);
|
|
}
|
|
|
|
case 'd':
|
|
{
|
|
float number;
|
|
return get_number(number) and sax->number_float(static_cast<double>(number), "");
|
|
}
|
|
|
|
case 'D':
|
|
{
|
|
double number;
|
|
return get_number(number) and sax->number_float(number, "");
|
|
}
|
|
|
|
case 'C': // char
|
|
{
|
|
get();
|
|
if (JSON_UNLIKELY(not unexpect_eof()))
|
|
{
|
|
return false;
|
|
}
|
|
if (JSON_UNLIKELY(current > 127))
|
|
{
|
|
auto last_token = get_token_string();
|
|
return sax->parse_error(chars_read, last_token, parse_error::create(113, chars_read, "byte after 'C' must be in range 0x00..0x7F; last byte: 0x" + last_token));
|
|
}
|
|
string_t s(1, static_cast<char>(current));
|
|
return sax->string(s);
|
|
}
|
|
|
|
case 'S': // string
|
|
{
|
|
string_t s;
|
|
return get_ubjson_string(s) and sax->string(s);
|
|
}
|
|
|
|
case '[': // array
|
|
return get_ubjson_array();
|
|
|
|
case '{': // object
|
|
return get_ubjson_object();
|
|
|
|
default: // anything else
|
|
{
|
|
auto last_token = get_token_string();
|
|
return sax->parse_error(chars_read, last_token, parse_error::create(112, chars_read, "error reading UBJSON; last byte: 0x" + last_token));
|
|
}
|
|
}
|
|
}
|
|
|
|
/*!
|
|
@return whether array creation completed
|
|
*/
|
|
bool get_ubjson_array()
|
|
{
|
|
std::pair<std::size_t, int> size_and_type;
|
|
if (JSON_UNLIKELY(not get_ubjson_size_type(size_and_type)))
|
|
{
|
|
return false;
|
|
}
|
|
|
|
if (size_and_type.first != string_t::npos)
|
|
{
|
|
if (JSON_UNLIKELY(not sax->start_array(size_and_type.first)))
|
|
{
|
|
return false;
|
|
}
|
|
|
|
if (size_and_type.second != 0)
|
|
{
|
|
if (size_and_type.second != 'N')
|
|
{
|
|
for (std::size_t i = 0; i < size_and_type.first; ++i)
|
|
{
|
|
if (JSON_UNLIKELY(not get_ubjson_value(size_and_type.second)))
|
|
{
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
for (std::size_t i = 0; i < size_and_type.first; ++i)
|
|
{
|
|
if (JSON_UNLIKELY(not parse_ubjson_internal()))
|
|
{
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (JSON_UNLIKELY(not sax->start_array()))
|
|
{
|
|
return false;
|
|
}
|
|
|
|
while (current != ']')
|
|
{
|
|
if (JSON_UNLIKELY(not parse_ubjson_internal(false)))
|
|
{
|
|
return false;
|
|
}
|
|
get_ignore_noop();
|
|
}
|
|
}
|
|
|
|
return sax->end_array();
|
|
}
|
|
|
|
/*!
|
|
@return whether object creation completed
|
|
*/
|
|
bool get_ubjson_object()
|
|
{
|
|
std::pair<std::size_t, int> size_and_type;
|
|
if (JSON_UNLIKELY(not get_ubjson_size_type(size_and_type)))
|
|
{
|
|
return false;
|
|
}
|
|
|
|
string_t key;
|
|
if (size_and_type.first != string_t::npos)
|
|
{
|
|
if (JSON_UNLIKELY(not sax->start_object(size_and_type.first)))
|
|
{
|
|
return false;
|
|
}
|
|
|
|
if (size_and_type.second != 0)
|
|
{
|
|
for (std::size_t i = 0; i < size_and_type.first; ++i)
|
|
{
|
|
if (JSON_UNLIKELY(not get_ubjson_string(key) or not sax->key(key)))
|
|
{
|
|
return false;
|
|
}
|
|
if (JSON_UNLIKELY(not get_ubjson_value(size_and_type.second)))
|
|
{
|
|
return false;
|
|
}
|
|
key.clear();
|
|
}
|
|
}
|
|
else
|
|
{
|
|
for (std::size_t i = 0; i < size_and_type.first; ++i)
|
|
{
|
|
if (JSON_UNLIKELY(not get_ubjson_string(key) or not sax->key(key)))
|
|
{
|
|
return false;
|
|
}
|
|
if (JSON_UNLIKELY(not parse_ubjson_internal()))
|
|
{
|
|
return false;
|
|
}
|
|
key.clear();
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (JSON_UNLIKELY(not sax->start_object()))
|
|
{
|
|
return false;
|
|
}
|
|
|
|
while (current != '}')
|
|
{
|
|
if (JSON_UNLIKELY(not get_ubjson_string(key, false) or not sax->key(key)))
|
|
{
|
|
return false;
|
|
}
|
|
if (JSON_UNLIKELY(not parse_ubjson_internal()))
|
|
{
|
|
return false;
|
|
}
|
|
get_ignore_noop();
|
|
key.clear();
|
|
}
|
|
}
|
|
|
|
return sax->end_object();
|
|
}
|
|
|
|
/*!
|
|
@return whether the last read character is not EOF
|
|
*/
|
|
bool unexpect_eof() const
|
|
{
|
|
if (JSON_UNLIKELY(current == std::char_traits<char>::eof()))
|
|
{
|
|
return sax->parse_error(chars_read, "<end of file>", parse_error::create(110, chars_read, "unexpected end of input"));
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/*!
|
|
@return a string representation of the last read byte
|
|
*/
|
|
std::string get_token_string() const
|
|
{
|
|
char cr[3];
|
|
snprintf(cr, 3, "%.2X", current);
|
|
return std::string{cr};
|
|
}
|
|
|
|
private:
|
|
/// input adapter
|
|
input_adapter_t ia = nullptr;
|
|
|
|
/// the current character
|
|
int current = std::char_traits<char>::eof();
|
|
|
|
/// the number of characters read
|
|
std::size_t chars_read = 0;
|
|
|
|
/// whether we can assume little endianess
|
|
const bool is_little_endian = little_endianess();
|
|
|
|
/// the SAX parser
|
|
json_sax_t* sax = nullptr;
|
|
};
|
|
}
|
|
}
|