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291 líneas
7.9 KiB
291 líneas
7.9 KiB
#pragma once
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#include <gp/bitops.hpp>
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#include <gp/optional.hpp>
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#include <gp/pair.hpp>
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#include <gp/variant.hpp>
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#include <gp/vector.hpp>
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namespace gp {
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enum class cbor_type : uint8_t {
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uint = 0,
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nint = 1,
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bstr = 2,
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tstr = 3,
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list = 4,
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hmap = 5,
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tags = 6,
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oths = 7
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};
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enum class cbor_oths : uint8_t {
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value_false = 20,
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value_true = 21,
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value_null = 22,
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value_undefined = 23,
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byte = 24,
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word = 25,
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dword = 26,
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qword = 27,
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terminator = 31
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};
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enum class cbor_tags {
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datetime = 0,
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unix_time = 1,
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ubignum = 2,
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nbignum = 3,
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decimal = 4,
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bigfloat = 5,
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cose_encrypt0 = 16,
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cose_mac0 = 17,
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cose_sign1 = 18,
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expected_base64url = 21,
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expected_base64 = 22,
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expected_base16 = 23,
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encoded_cbor = 24,
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url = 32,
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base64url = 33,
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base64 = 34,
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regexp = 35,
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mime = 36,
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cose_encrypt = 96,
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cose_mac = 97,
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cose_sign = 98,
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signature = 55799
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};
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struct cbor_number final {
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bool sign;
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uint64_t value;
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bool is_negative() {
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return sign;
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}
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cbor_number(int64_t v)
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: sign{v < 0}
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, value{uint64_t((sign ? -1 : 1) * v)}
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{}
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};
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struct ieee754_hf final {
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uint16_t sign : 1;
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uint16_t exponent : 5;
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uint16_t mantissa : 10;
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};
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using cbor_floating_point = gp::fixed_variant<
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ieee754_hf,
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float,
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double
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>;
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struct undefined_t final {};
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template<typename T>
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using cbor_composite = gp::fixed_variant<
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undefined_t,
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cbor_number,
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gp::buffer<std::byte>,
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bool,
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gp::vector<T>,
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gp::vector<gp::pair<T, T>>,
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gp::nullopt_t,
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cbor_floating_point
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>;
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class cbor_value {
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cbor_composite<cbor_value> contents;
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gp::reference_wrapper<allocator> alloc;
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public:
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cbor_value(allocator& alloc_v)
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: contents(cbor_composite<cbor_value>(undefined_t{}))
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, alloc(alloc_v)
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{}
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cbor_value(cbor_number number, allocator& alloc_v)
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: contents(number)
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, alloc(alloc_v)
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{}
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cbor_value(const cbor_value& oth)
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: contents(oth.contents)
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, alloc(oth.alloc)
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{}
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cbor_value(cbor_value&& oth)
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: contents(gp::move(oth.contents))
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, alloc(gp::move(oth.alloc))
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{}
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cbor_value& operator=(cbor_value& value) {
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contents = value.contents;
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alloc = value.alloc;
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return *this;
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}
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cbor_value& operator=(cbor_value&& value) {
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gp::swap(contents, value.contents);
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gp::swap(alloc, value.alloc);
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return *this;
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}
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cbor_value& operator=(cbor_composite<cbor_value>& value) {
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contents = value;
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return *this;
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}
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template<typename T>
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cbor_value& operator=(T& value) {
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contents = value;
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return *this;
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}
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template<typename T>
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cbor_value& operator=(T&& value) {
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contents = gp::move(value);
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return *this;
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}
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auto new_array() {
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return gp::vector<cbor_value>{alloc};
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}
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auto new_object() {
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return gp::vector<gp::pair<cbor_value, cbor_value>>{alloc};
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}
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static auto encode_float(buffer<std::byte> dest, cbor_floating_point& value) {
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switch(value.type()) {
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case cbor_floating_point::alt<ieee754_hf>():{
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if(dest.size() < 3) return dest.begin();
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dest[0] = std::byte(((uint8_t)cbor_type::oths << 5u) + (uint8_t)cbor_oths::word);
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(dest.slice_start(3).slice_end(2).cast<gp::endian_wrapper<ieee754_hf, gp::endian::big>>())[0] = value.value<ieee754_hf>();
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return dest.begin()+3;
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}
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case cbor_floating_point::alt<float>():{
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if(dest.size() < 5) return dest.begin();
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dest[0] = std::byte(((uint8_t)cbor_type::oths << 5u) + (uint8_t)cbor_oths::dword);
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(dest.slice_start(5).slice_end(4).cast<gp::endian_wrapper<float, gp::endian::big>>())[0] = value.value<float>();
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return dest.begin()+5;
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}
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case cbor_floating_point::alt<double>():{
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if(dest.size() < 9) return dest.begin();
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dest[0] = std::byte(((uint8_t)cbor_type::oths << 5u) + (uint8_t)cbor_oths::qword);
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(dest.slice_start(9).slice_end(8).cast<gp::endian_wrapper<double, gp::endian::big>>())[0] = value.value<double>();
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return dest.begin()+9;
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}
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default: return dest.begin();
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}
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}
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static auto encode_length(buffer<std::byte> dest, cbor_type major, uint64_t value) {
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auto num = value;
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if(value <= 23) {
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if(dest.size() < 1) return dest.begin();
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dest[0] = std::byte(((uint8_t)major << 5u) + value);
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return dest.begin()+1;
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} else if(value <= 255) {
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if(dest.size() < 2) return dest.begin();
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dest[0] = std::byte(((uint8_t)major << 5u) + (uint8_t)cbor_oths::byte);
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dest[1] = std::byte(value);
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return dest.begin() + 2;
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} else if(value <= 65535) {
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if(dest.size() < 3) return dest.begin();
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dest[0] = std::byte(((uint8_t)major << 5u) + (uint8_t)cbor_oths::word);
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(dest.slice_start(3).slice_end(2).cast<gp::endian_wrapper<uint16_t, gp::endian::big>>())[0] = num;
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return dest.begin()+3;
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} else if(value <= 4294967295) {
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if(dest.size() < 5) return dest.begin();
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dest[0] = std::byte(((uint8_t)major << 5u) + (uint8_t)cbor_oths::dword);
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(dest.slice_start(5).slice_end(4).cast<gp::endian_wrapper<uint32_t, gp::endian::big>>())[0] = num;
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return dest.begin()+5;
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} else {
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if(dest.size() < 9) return dest.begin();
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dest[0] = std::byte(((uint8_t)major << 5u) + (uint8_t)cbor_oths::qword);
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(dest.slice_start(9).slice_end(8).cast<gp::endian_wrapper<uint64_t, gp::endian::big>>())[0] = num;
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return dest.begin()+9;
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}
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}
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auto encode(buffer<std::byte> dest) {
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switch(contents.type()) {
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case cbor_composite<cbor_value>::alt<undefined_t>(): {
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if(dest.size() < 1) return dest.begin();
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dest[0] = std::byte(((uint8_t)cbor_type::oths << 5u) + (uint8_t)cbor_oths::value_undefined);
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return dest.begin()+1;
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}
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case cbor_composite<cbor_value>::alt<cbor_number>(): {
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auto& ref = contents.value<cbor_number>();
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return encode_length(
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dest,
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ref.is_negative() ? cbor_type::nint : cbor_type::uint,
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ref.value
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);
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}
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case cbor_composite<cbor_value>::alt<gp::buffer<std::byte>>(): {
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auto& ref = contents.value<gp::buffer<std::byte>>();
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auto it = encode_length(
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dest,
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cbor_type::bstr,
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ref.size()
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);
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if(it == dest.begin()) return it;
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for(auto a : ref) {
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*(it++) = a;
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}
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return it;
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}
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case cbor_composite<cbor_value>::alt<bool>(): {
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if(dest.size() < 1) return dest.begin();
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if(contents.value<bool>())
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dest[0] = std::byte(((uint8_t)cbor_type::oths << 5u) + (uint8_t)cbor_oths::value_true);
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else
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dest[0] = std::byte(((uint8_t)cbor_type::oths << 5u) + (uint8_t)cbor_oths::value_false);
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return dest.begin()+1;
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}
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case cbor_composite<cbor_value>::alt<gp::vector<cbor_value>>(): {
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auto& ary = contents.value<gp::vector<cbor_value>>();
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auto it_begin = encode_length(dest, cbor_type::list, ary.size());
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if(it_begin != dest.begin()) return dest.begin();
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for(auto& elem : ary) {
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auto slice = dest.slice_end(dest.size() - (it_begin - dest.begin()));
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auto it = elem.encode(slice);
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if(it == it_begin) return dest.begin();
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it_begin = it;
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}
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return it_begin;
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}
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case cbor_composite<cbor_value>::alt<gp::vector<gp::pair<cbor_value, cbor_value>>>(): {
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auto& ary = contents.value<gp::vector<gp::pair<cbor_value,cbor_value>>>();
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auto it_begin = encode_length(dest, cbor_type::hmap, ary.size());
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if(it_begin != dest.begin()) return dest.begin();
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for(auto& elem : ary) {
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auto slice = dest.slice_end(dest.size() - (it_begin - dest.begin()));
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auto it = elem.first.encode(slice);
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if(it == it_begin) return dest.begin();
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it_begin = it;
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slice = dest.slice_end(dest.size() - (it_begin - dest.begin()));
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it = elem.second.encode(slice);
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if(it == it_begin) return dest.begin();
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it_begin = it;
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}
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return it_begin;
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}
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case cbor_composite<cbor_value>::alt<gp::nullopt_t>(): {
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if(dest.size() < 1) return dest.begin();
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dest[0] = std::byte(((uint8_t)cbor_type::oths << 5u) + (uint8_t)cbor_oths::value_null);
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return dest.begin()+1;
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}
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case cbor_composite<cbor_value>::alt<cbor_floating_point>(): {
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return encode_float(dest, contents.value<cbor_floating_point>());
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}
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}
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}
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};
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}
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