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648 lines
18 KiB
648 lines
18 KiB
#pragma once
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#include <gp/algorithm/repeat.hpp>
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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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cbor_number(bool s, uint64_t v)
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: sign{s}
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, value{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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// TODO: support for denormalized values and NaNs
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operator float() {
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auto a = (uint32_t)((sign<<16) | ((exponent+0x1C000)<<13) | (mantissa<<13));
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return *(float*)&a;
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}
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operator double() {
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return (float)*this;
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}
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};
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struct cbor_floating_point final {
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using backing = 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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backing contents;
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cbor_floating_point(backing& p)
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: contents{p}{}
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cbor_floating_point(ieee754_hf p)
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: contents{p}{}
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cbor_floating_point(float p)
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: contents{p}{}
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cbor_floating_point(double p)
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: contents{p}{}
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operator ieee754_hf() {
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return contents.value<ieee754_hf>();
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}
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operator float() {
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switch(contents.type()) {
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case backing::alt<ieee754_hf>():
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return contents.value<ieee754_hf>();
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case backing::alt<float>():
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return contents.value<float>();
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default:
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gp_config::assertion(false,"this code should never be reached");
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return std::numeric_limits<float>::quiet_NaN();
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}
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}
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operator double() {
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switch(contents.type()) {
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case backing::alt<ieee754_hf>():
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return contents.value<ieee754_hf>();
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case backing::alt<float>():
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return contents.value<float>();
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case backing::alt<double>():
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return contents.value<double>();
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default:
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gp_config::assertion(false,"this code should never be reached");
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return std::numeric_limits<double>::quiet_NaN();
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}
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}
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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::vector<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()
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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(cbor_composite<cbor_value> val, allocator& alloc_v)
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: contents(val)
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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 gp::pair<uint64_t, gp::buffer<std::byte>::associated_iterator> decode_integer(gp::buffer<std::byte> src) {
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#define ERROR return {0, src.begin()}
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auto local = (uint8_t)0b00011111 & (uint8_t)src[0];
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if(local <= 23) {
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return {local, src.begin()+1};
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} else {
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switch((cbor_oths)local) {
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case cbor_oths::byte: {
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if(src.size()<2) ERROR;
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return {
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(uint8_t)*(src.begin()+1),
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src.begin()+2
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};
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}
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case cbor_oths::word: {
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if(src.size()<3) ERROR;
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return {
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uint16_t(*(gp::endian_wrapper<uint16_t, endian::big>*)(src.begin().data)),
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src.begin()+3
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};
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}
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case cbor_oths::dword: {
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if(src.size()<5) ERROR;
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return {
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uint32_t(*(gp::endian_wrapper<uint32_t, endian::big>*)(src.begin().data)),
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src.begin()+5
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};
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}
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case cbor_oths::qword: {
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if(src.size()<9) ERROR;
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return {
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uint64_t(*(gp::endian_wrapper<uint64_t, endian::big>*)(src.begin().data)),
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src.begin()+9
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};
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}
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default: {
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ERROR;
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}
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}
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}
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#undef ERROR
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}
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template<typename U>
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U& value() {
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}
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template<typename U>
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bool is_a() {
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if constexpr (
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std::is_same_v<U, uint8_t>
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|| std::is_same_v<U, uint16_t>
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|| std::is_same_v<U, uint32_t>
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|| std::is_same_v<U, uint64_t>
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|| std::is_same_v<U, int8_t>
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|| std::is_same_v<U, int16_t>
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|| std::is_same_v<U, int32_t>
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|| std::is_same_v<U, int64_t>
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) {
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if(contents.is_a<cbor_number>())
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{
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auto& v = contents.value<cbor_number>();
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if(!std::is_signed_v<U> && v.is_negative()) return false;
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if(
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std::numeric_limits<int64_t>::max()<v.value
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&& (
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!std::is_same_v<U, uint64_t>
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|| v.is_negative()
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)
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) return false;
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int64_t signed_v = (v.is_negative() ? -1 : 1 ) * v.value;
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if(
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std::numeric_limits<U>::min() <= signed_v
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&& std::numeric_limits<U>::max() >= signed_v
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) return true;
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return false;
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} else return false;
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} else if constexpr (
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std::is_same_v<U, ieee754_hf>
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|| std::is_same_v<U, float>
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|| std::is_same_v<U, double>
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) {
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auto& v = contents.value<cbor_floating_point>();
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switch(v.contents.type()) {
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case cbor_floating_point::backing::alt<ieee754_hf>():
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return std::is_same_v<U, ieee754_hf>;
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case cbor_floating_point::backing::alt<float>():
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return std::is_same_v<U, float> || std::is_same_v<U, ieee754_hf>;
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case cbor_floating_point::backing::alt<double>():
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return std::is_same_v<U, double> || std::is_same_v<U, float> || std::is_same_v<U, ieee754_hf>;
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default:
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return false;
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}
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} else {
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return contents.is_a<U>();
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}
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}
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template<typename U>
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U get_value() {
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gp_config::assertion(is_a<U>(), "can't convert value legally");
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if constexpr (
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std::is_same_v<U, uint8_t>
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|| std::is_same_v<U, uint16_t>
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|| std::is_same_v<U, uint32_t>
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|| std::is_same_v<U, uint64_t>
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|| std::is_same_v<U, int8_t>
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|| std::is_same_v<U, int16_t>
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|| std::is_same_v<U, int32_t>
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|| std::is_same_v<U, int64_t>
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) {
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auto& v = contents.value<cbor_number>();
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return (v.is_negative() ? -1 : 1 ) * v.value;
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} else if constexpr (
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std::is_same_v<U, ieee754_hf>
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|| std::is_same_v<U, float>
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|| std::is_same_v<U, double>
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) {
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auto& v = contents.value<cbor_floating_point>();
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return v;
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} else {
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return contents.value<U>();
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}
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}
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static gp::pair<cbor_value, gp::buffer<std::byte>::associated_iterator> decode(allocator& alloc, gp::buffer<std::byte> src) {
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#define ERROR return {cbor_value{alloc}, src.begin()}
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if(src.size()==0) ERROR;
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auto discriminant = (cbor_type)(((uint8_t)*src.begin()) >> 5);
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auto local = uint8_t(((uint8_t)*src.begin()) & 0b00011111);
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switch(discriminant) {
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case cbor_type::uint:
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case cbor_type::nint: {
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auto nb = decode_integer(src);
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return {cbor_value{cbor_number{(bool)discriminant, nb.first}, alloc}, nb.second};
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}
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case cbor_type::bstr: {
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gp::vector<std::byte> str{alloc};
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if(local == 31) {
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auto sub = src.slice_end(src.size() - 1);
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if(!sub.size()) ERROR;
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while((uint8_t)sub[0] && 0b00011111 != 31) {
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auto len = decode_integer(sub);
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if(len.second == sub.begin()) ERROR;
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str.reserve(str.size() + len.first);
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auto end = (len.second + len.first);
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if(len.first + (len.second - src.begin()) > src.size()) ERROR;
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for(auto it = len.second; it != end; it++) {
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str.push_back(*it);
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}
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sub = sub.slice_end(sub.size() - (len.first + (len.second - sub.begin())));
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}
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return {cbor_value{str, alloc}, sub.begin()+1};
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} else if(auto len = decode_integer(src); len.second != src.begin()) {
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str.reserve(len.first);
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auto end = (len.second + len.first);
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if(len.first + (len.second - src.begin()) > src.size()) ERROR;
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for(auto it = len.second; it != end; it++) {
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str.push_back(*it);
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}
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return {cbor_value{str, alloc}, end};
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}
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ERROR;
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}
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case cbor_type::tstr: {
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ERROR;
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}
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case cbor_type::list: {
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gp::vector<cbor_value> list{alloc};
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if(local == 31) {
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// TODO: Add the indefinite length version
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} else if(auto len = decode_integer(src); len.second != src.begin()) {
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auto sub = src.slice_end(src.size()-(len.second - src.begin()));
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while(len.first--) {
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auto tmp = decode(alloc, sub);
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if(tmp.second == sub.begin()) ERROR;
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list.push_back(tmp.first);
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sub = sub.slice_end(sub.size() - (tmp.second - sub.begin()));
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}
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return {cbor_value{list, alloc}, sub.begin()};
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}
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ERROR;
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}
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case cbor_type::hmap: {
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gp::vector<gp::pair<cbor_value, cbor_value>> list{alloc};
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if(local == 31) {
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// TODO: Add the indefinite length version
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} else if(auto len = decode_integer(src); len.second != src.begin()) {
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auto sub = src.slice_end(src.size()-(len.second - src.begin()));
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while(len.first--) {
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auto tmpl = decode(alloc, sub);
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if(tmpl.second == sub.begin()) ERROR;
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sub = sub.slice_end(sub.size() - (tmpl.second - sub.begin()));
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auto tmpr = decode(alloc, sub);
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if(tmpr.second == sub.begin()) ERROR;
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list.push_back(gp::make_pair(
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tmpl.first,
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tmpr.first
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));
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sub = sub.slice_end(sub.size() - (tmpr.second - sub.begin()));
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}
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return {cbor_value{list, alloc}, sub.begin()};
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}
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ERROR;
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}
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case cbor_type::tags: {
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}
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case cbor_type::oths: {
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switch((cbor_oths)local) {
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case cbor_oths::value_false: {
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return {
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cbor_value{
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cbor_composite<cbor_value>(false),
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alloc
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},
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src.begin()+1
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};
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}
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case cbor_oths::value_true: {
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return {
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cbor_value{
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cbor_composite<cbor_value>(true),
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alloc
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},
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src.begin()+1
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};
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}
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case cbor_oths::value_null: {
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return {
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cbor_value{
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cbor_composite<cbor_value>(nullopt),
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alloc
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},
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src.begin()+1
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};
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}
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case cbor_oths::value_undefined: {
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return {
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cbor_value{
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cbor_composite<cbor_value>(undefined_t{}),
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alloc
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},
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src.begin()+1
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};
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}
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case cbor_oths::word: {
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if(src.size()<3) ERROR;
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return {
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cbor_value{
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cbor_floating_point{(ieee754_hf)(*(gp::endian_wrapper<ieee754_hf, endian::big>*)(src.begin().data))},
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alloc
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},
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src.begin()+3
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};
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}
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case cbor_oths::dword: {
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if(src.size()<5) ERROR;
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return {
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cbor_value{
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cbor_floating_point{float(*(gp::endian_wrapper<float, endian::big>*)(src.begin().data))},
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alloc
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},
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src.begin()+5
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};
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}
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case cbor_oths::qword: {
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if(src.size()<9) ERROR;
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return {
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cbor_value{
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cbor_floating_point{double(*(gp::endian_wrapper<double, endian::big>*)(src.begin().data))},
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alloc
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},
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src.begin()+9
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};
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}
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default: {
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ERROR;
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}
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}
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}
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}
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ERROR;
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#undef ERROR
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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.contents.type()) {
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case cbor_floating_point::backing::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.contents.value<ieee754_hf>();
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return dest.begin()+3;
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}
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case cbor_floating_point::backing::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);
|
|
(dest.slice_start(5).slice_end(4).cast<gp::endian_wrapper<float, gp::endian::big>>())[0] = value.contents.value<float>();
|
|
return dest.begin()+5;
|
|
}
|
|
case cbor_floating_point::backing::alt<double>():{
|
|
if(dest.size() < 9) return dest.begin();
|
|
dest[0] = std::byte(((uint8_t)cbor_type::oths << 5u) + (uint8_t)cbor_oths::qword);
|
|
(dest.slice_start(9).slice_end(8).cast<gp::endian_wrapper<double, gp::endian::big>>())[0] = value.contents.value<double>();
|
|
return dest.begin()+9;
|
|
}
|
|
default: return dest.begin();
|
|
}
|
|
}
|
|
|
|
static auto encode_length(buffer<std::byte> dest, cbor_type major, uint64_t value) {
|
|
auto num = value;
|
|
if(value <= 23) {
|
|
if(dest.size() < 1) return dest.begin();
|
|
dest[0] = std::byte(((uint8_t)major << 5u) + value);
|
|
return dest.begin()+1;
|
|
} else if(value <= 255) {
|
|
if(dest.size() < 2) return dest.begin();
|
|
dest[0] = std::byte(((uint8_t)major << 5u) + (uint8_t)cbor_oths::byte);
|
|
dest[1] = std::byte(value);
|
|
return dest.begin() + 2;
|
|
} else if(value <= 65535) {
|
|
if(dest.size() < 3) return dest.begin();
|
|
dest[0] = std::byte(((uint8_t)major << 5u) + (uint8_t)cbor_oths::word);
|
|
(dest.slice_start(3).slice_end(2).cast<gp::endian_wrapper<uint16_t, gp::endian::big>>())[0] = num;
|
|
return dest.begin()+3;
|
|
} else if(value <= 4294967295) {
|
|
if(dest.size() < 5) return dest.begin();
|
|
dest[0] = std::byte(((uint8_t)major << 5u) + (uint8_t)cbor_oths::dword);
|
|
(dest.slice_start(5).slice_end(4).cast<gp::endian_wrapper<uint32_t, gp::endian::big>>())[0] = num;
|
|
return dest.begin()+5;
|
|
} else {
|
|
if(dest.size() < 9) return dest.begin();
|
|
dest[0] = std::byte(((uint8_t)major << 5u) + (uint8_t)cbor_oths::qword);
|
|
(dest.slice_start(9).slice_end(8).cast<gp::endian_wrapper<uint64_t, gp::endian::big>>())[0] = num;
|
|
return dest.begin()+9;
|
|
}
|
|
}
|
|
|
|
auto encode(buffer<std::byte> dest) {
|
|
switch(contents.type()) {
|
|
case cbor_composite<cbor_value>::alt<undefined_t>(): {
|
|
if(dest.size() < 1) return dest.begin();
|
|
dest[0] = std::byte(((uint8_t)cbor_type::oths << 5u) + (uint8_t)cbor_oths::value_undefined);
|
|
return dest.begin()+1;
|
|
}
|
|
case cbor_composite<cbor_value>::alt<cbor_number>(): {
|
|
auto& ref = contents.value<cbor_number>();
|
|
return encode_length(
|
|
dest,
|
|
ref.is_negative() ? cbor_type::nint : cbor_type::uint,
|
|
ref.value
|
|
);
|
|
}
|
|
case cbor_composite<cbor_value>::alt<gp::vector<std::byte>>(): {
|
|
auto& ref = contents.value<gp::vector<std::byte>>();
|
|
auto it = encode_length(
|
|
dest,
|
|
cbor_type::bstr,
|
|
ref.size()
|
|
);
|
|
if(it == dest.begin()) return it;
|
|
|
|
for(auto a : ref) {
|
|
*(it++) = a;
|
|
}
|
|
return it;
|
|
}
|
|
case cbor_composite<cbor_value>::alt<bool>(): {
|
|
if(dest.size() < 1) return dest.begin();
|
|
if(contents.value<bool>())
|
|
dest[0] = std::byte(((uint8_t)cbor_type::oths << 5u) + (uint8_t)cbor_oths::value_true);
|
|
else
|
|
dest[0] = std::byte(((uint8_t)cbor_type::oths << 5u) + (uint8_t)cbor_oths::value_false);
|
|
return dest.begin()+1;
|
|
}
|
|
case cbor_composite<cbor_value>::alt<gp::vector<cbor_value>>(): {
|
|
auto& ary = contents.value<gp::vector<cbor_value>>();
|
|
auto it_begin = encode_length(dest, cbor_type::list, ary.size());
|
|
if(it_begin == dest.begin()) return dest.begin();
|
|
for(auto& elem : ary) {
|
|
auto slice = dest.slice_end(dest.size() - (it_begin - dest.begin()));
|
|
auto it = elem.encode(slice);
|
|
if(it == it_begin)
|
|
return dest.begin();
|
|
it_begin = it;
|
|
}
|
|
return it_begin;
|
|
}
|
|
case cbor_composite<cbor_value>::alt<gp::vector<gp::pair<cbor_value, cbor_value>>>(): {
|
|
auto& ary = contents.value<gp::vector<gp::pair<cbor_value,cbor_value>>>();
|
|
auto it_begin = encode_length(dest, cbor_type::hmap, ary.size());
|
|
if(it_begin == dest.begin()) return dest.begin();
|
|
|
|
for(auto& elem : ary) {
|
|
auto slice = dest.slice_end(dest.size() - (it_begin - dest.begin()));
|
|
auto it = elem.first.encode(slice);
|
|
if(it == it_begin) return dest.begin();
|
|
it_begin = it;
|
|
|
|
slice = dest.slice_end(dest.size() - (it_begin - dest.begin()));
|
|
it = elem.second.encode(slice);
|
|
if(it == it_begin) return dest.begin();
|
|
it_begin = it;
|
|
}
|
|
return it_begin;
|
|
}
|
|
case cbor_composite<cbor_value>::alt<gp::nullopt_t>(): {
|
|
if(dest.size() < 1) return dest.begin();
|
|
dest[0] = std::byte(((uint8_t)cbor_type::oths << 5u) + (uint8_t)cbor_oths::value_null);
|
|
return dest.begin()+1;
|
|
}
|
|
case cbor_composite<cbor_value>::alt<cbor_floating_point>(): {
|
|
return encode_float(dest, contents.value<cbor_floating_point>());
|
|
}
|
|
default: return dest.begin();
|
|
}
|
|
}
|
|
};
|
|
}
|