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480 lines
13 KiB
480 lines
13 KiB
#pragma once
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#include <gp/algorithms/repeat.hpp>
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#include <gp/math/boolean/bitops.hpp>
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#include <gp/functional/optional.hpp>
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#include <gp/utils/pair.hpp>
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#include <gp/functional/variant.hpp>
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#include <gp/containers/vector.hpp>
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#include <concepts>
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// TODO: Rewrite in a more ORM-like way
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// TODO: Implement some bignum for support
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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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inline vector<char>& push_integer_with_header_as_cbor(vector<char>& src, uint8_t header, uint64_t value) {
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auto norm_v = (value<0) ? -value : value;
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if(norm_v <= 23) {
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src.push_back(header+norm_v);
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} else if(norm_v < (1ll<<8ll)) {
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src.push_back(header+24);
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src.push_back(norm_v);
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} else if(norm_v < (1ll<<16ll)) {
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endian_wrapper<uint16_t, endian::big> wrapper = norm_v;
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src.push_back(header+25);
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for(auto byte : wrapper.bytes) {
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src.push_back(byte);
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}
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} else if(norm_v < (1ll<<32ll)) {
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endian_wrapper<uint32_t, endian::big> wrapper = norm_v;
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src.push_back(header+26);
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for(auto byte : wrapper.bytes) {
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src.push_back(byte);
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}
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} else {
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endian_wrapper<uint64_t, endian::big> wrapper = norm_v;
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src.push_back(header+27);
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for(auto byte : wrapper.bytes) {
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src.push_back(byte);
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}
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}
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return src;
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}
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/**
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* @brief Pushes an integer as CBOR on the vector
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*
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* @param src the vector on which the push happens
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* @param value the value to push, can be signed
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* @return vector<char>& the same reference that was received for the source
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*/
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template<std::signed_integral T>
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inline vector<char>& push_as_cbor(vector<char>& src, T value) {
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uint8_t sign = (value<0) ? 0b00100000 : 0;
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auto norm_v = (value<0) ? -value : value;
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return push_integer_with_header_as_cbor(src, sign, norm_v);
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}
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/**
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* @brief Pushes an unsigned integer as CBOR on the vector
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*
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* @param src the vector on which the push happens
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* @param value the value to push, cannot be signed
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* @return vector<char>& the same reference that was received for the source
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*/
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template<std::unsigned_integral T>
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inline vector<char>& push_as_cbor(vector<char>& src, T value) {
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return push_integer_with_header_as_cbor(src, 0, value);
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}
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inline vector<char>& push_as_cbor(vector<char>& src, std::nullptr_t) {
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src.push_back(0b11110110);
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return src;
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}
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struct cbor_undefined{};
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inline vector<char>& push_as_cbor(vector<char>& src, cbor_undefined) {
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src.push_back(0b11110111);
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return src;
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}
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inline vector<char>& push_as_cbor(vector<char>& src, bool value) {
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src.push_back(0b11110100+(value ? 1 : 0));
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return src;
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}
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inline vector<char>& push_as_cbor(vector<char>& src, gp::buffer<char> value) {
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push_integer_with_header_as_cbor(src, (uint8_t)0b01000000, value.size());
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for(auto byte : value) {
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src.push_back(byte);
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}
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return src;
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}
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struct cbor_array_initiator {
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size_t size;
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};
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struct cbor_associative_array_initiator {
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size_t size;
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};
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inline vector<char>& push_as_cbor(vector<char>& src, cbor_array_initiator value) {
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return push_integer_with_header_as_cbor(src, (uint8_t)0b10000000, value.size);
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}
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inline vector<char>& push_as_cbor(vector<char>& src, cbor_associative_array_initiator value) {
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return push_integer_with_header_as_cbor(src, (uint8_t)0b10100000, value.size);
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}
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template<typename First, typename Second>
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inline vector<char>& push_as_cbor(vector<char>& src, gp::pair<First, Second> value) {
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push_as_cbor(src,value.first);
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return push_as_cbor(src,value.second);
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}
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template<typename First, typename Second>
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inline vector<char>& push_as_cbor(vector<char>& src, gp::pair<First, Second>& value) {
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push_as_cbor(src,value.first);
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return push_as_cbor(src,value.second);
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}
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struct cbor_tag_initiator {
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union {
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size_t as_integer;
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cbor_tags tag;
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};
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};
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inline vector<char>& push_as_cbor(vector<char>& src, cbor_tag_initiator value) {
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return push_integer_with_header_as_cbor(src, (uint8_t)0b11000000, value.as_integer);
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}
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using parsing_state = gp::buffer<char>;
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template<typename T>
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gp::pair<gp::optional<T>, parsing_state> read_cbor(parsing_state state, gp::allocator&);
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inline gp::pair<gp::optional<uint64_t>, parsing_state> pull_arbitrary_integer_from_cbor(parsing_state state) {
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auto local = (uint8_t)0b00011111 & (uint8_t)*state.begin();
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if(local <= 23) {
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return {local, {state.begin()+1, state.end()}};
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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(state.size() < 2) return {nullopt, state};
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return {*(state.begin()+1), {state.begin()+2, state.end()}};
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}
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case cbor_oths::word: {
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if(state.size() < 3) return {nullopt, state};
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return {
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uint16_t(*(state.slice_start(3).slice_end(2).cast<gp::endian_wrapper<uint16_t, endian::big>>().begin())),
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{state.begin()+3, state.end()}
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};
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}
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case cbor_oths::dword: {
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if(state.size() < 5) return {nullopt, state};
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return {
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uint32_t(*(state.slice_start(5).slice_end(4).cast<gp::endian_wrapper<uint32_t, endian::big>>().begin())),
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{state.begin()+5, state.end()}
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};
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}
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case cbor_oths::qword: {
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if(state.size() < 9) return {nullopt, state};
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return {
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uint64_t(*(state.slice_start(9).slice_end(8).cast<gp::endian_wrapper<uint64_t, endian::big>>().begin())),
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{state.begin()+9, state.end()}
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};
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}
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default: {
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return {nullopt, state};
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}
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}
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}
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}
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template<std::integral T>
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inline gp::pair<gp::optional<T>, parsing_state> read_cbor(parsing_state state, gp::allocator&) {
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// TODO: Handling of over and underflow
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if(!state.size()) return {nullopt, state};
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auto type = cbor_type(((uint8_t)0b11100000 & (uint8_t)*state.begin()) >> 5);
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switch(type) {
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case cbor_type::uint:
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{
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auto[value, new_state] = pull_arbitrary_integer_from_cbor(state);
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if(value.has_value()) return {value.value(), new_state};
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break;
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}
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case cbor_type::nint:
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{
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auto[value, new_state] = pull_arbitrary_integer_from_cbor(state);
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if(value.has_value()) return {-value.value(), new_state};
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break;
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}
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default:
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break;
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}
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return {nullopt, state};
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}
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template<>
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inline gp::pair<gp::optional<cbor_tag_initiator>, parsing_state> read_cbor<cbor_tag_initiator>(parsing_state state, gp::allocator&) {
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if(!state.size()) return {nullopt, state};
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auto type = cbor_type(((uint8_t)0b11100000 & (uint8_t)*state.begin()) >> 5);
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switch(type) {
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case cbor_type::tags:
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{
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auto[value, new_state] = pull_arbitrary_integer_from_cbor(state);
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if(value.has_value()) return {cbor_tag_initiator{.as_integer = value.value()}, new_state};
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break;
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}
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default: break;
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}
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return {nullopt, state};
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}
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template<>
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inline gp::pair<gp::optional<gp::vector<char>>, parsing_state> read_cbor<gp::vector<char>>(parsing_state state, gp::allocator& alloc) {
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if(!state.size()) return {nullopt, state};
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auto type = cbor_type(((uint8_t)0b11100000 & (uint8_t)*state.begin()) >> 5);
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switch(type) {
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case cbor_type::bstr:
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{
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const auto[size, new_state] = pull_arbitrary_integer_from_cbor(state);
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if(!size.has_value()) break;
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if(new_state.size()<size.value()) break;
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gp::vector<char> return_value{alloc};
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if(!return_value.reserve(size.value())) break;
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auto end_it = new_state.begin() + size.value();
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for(auto it = new_state.begin(); it != end_it; it++) {
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return_value.push_back(*it);
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}
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return {optional<gp::vector<char>>(gp::move(return_value)), parsing_state(new_state.begin() + size.value(), new_state.end())};
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break;
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}
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default: break;
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}
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return {nullopt, state};
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}
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template<>
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inline gp::pair<gp::optional<std::nullptr_t>, parsing_state> read_cbor<std::nullptr_t>(parsing_state state, gp::allocator& alloc) {
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if(!state.size()) return {nullopt, state};
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auto type = cbor_type(((uint8_t)0b11100000 & (uint8_t)*state.begin()) >> 5);
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switch(type) {
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case cbor_type::oths:
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{
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const auto[value, new_state] = pull_arbitrary_integer_from_cbor(state);
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if(!value.has_value()) break;
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if(value.value() == 22)
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{
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return {optional(nullptr), parsing_state(new_state.begin()+1, new_state.end())};
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}
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break;
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}
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default: break;
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}
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return {nullopt, state};
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}
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template<>
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inline gp::pair<gp::optional<bool>, parsing_state> read_cbor<bool>(parsing_state state, gp::allocator& alloc) {
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if(!state.size()) return {nullopt, state};
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auto type = cbor_type(((uint8_t)0b11100000 & (uint8_t)*state.begin()) >> 5);
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switch(type) {
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case cbor_type::oths:
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{
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const auto[value, new_state] = pull_arbitrary_integer_from_cbor(state);
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if(!value.has_value()) break;
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if(value.value() == 20)
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{
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return {false, parsing_state(new_state.begin()+1, new_state.end())};
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}
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else if(value.value() == 21)
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{
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return {true, parsing_state(new_state.begin()+1, new_state.end())};
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}
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break;
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}
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default: break;
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}
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return {nullopt, state};
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}
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template<>
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inline gp::pair<gp::optional<cbor_undefined>, parsing_state> read_cbor<cbor_undefined>(parsing_state state, gp::allocator& alloc) {
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if(!state.size()) return {nullopt, state};
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auto type = cbor_type(((uint8_t)0b11100000 & (uint8_t)*state.begin()) >> 5);
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switch(type) {
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case cbor_type::oths:
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{
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const auto[value, new_state] = pull_arbitrary_integer_from_cbor(state);
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if(!value.has_value()) break;
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if(value.value() == 23)
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{
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return {optional(cbor_undefined{}), parsing_state(new_state.begin()+1, new_state.end())};
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}
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break;
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}
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default: break;
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}
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return {nullopt, state};
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}
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/**
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* @brief
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*
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* @param state
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* @param callback a callback that returns a new parsing state for every element read. It should follow the heredescribed signature: parsing_state(parsing_state, gp::allocator&)
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* @param count_callback a callback that is used to check if the process should proceed given a count of elements in the list. It should follow the heredescribed signature: bool(uint64_t)
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* @param alloc
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*/
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template<typename applier_cb, typename counter_cb>
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inline parsing_state read_cbor_array(parsing_state state, gp::allocator& alloc, applier_cb callback, counter_cb count_callback = [](uint64_t) -> bool {return true;}) {
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if(!state.size()) return state;
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auto type = cbor_type(((uint8_t)0b11100000 & (uint8_t)*state.begin()) >> 5);
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switch(type) {
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case cbor_type::list:
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{
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const auto[size, new_state] = pull_arbitrary_integer_from_cbor(state);
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if(!size.has_value()) return state;
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if(new_state.size()<size.value()) return state;
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if(!count_callback(size.value()))return state;
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parsing_state forward = new_state;
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for(auto idx = 0ull; idx != size.value(); idx++) {
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if(forward.size() == 0) return state;
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forward = callback(forward, alloc);
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}
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return forward;
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}
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default: return state;
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}
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}
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/**
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* @brief
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*
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* @param state
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* @param callback a callback that returns a new parsing state for every element read. It should follow the heredescribed signature: parsing_state(parsing_state, gp::allocator&), it MUST read exactly 2 cbor value from the stream.
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* @param count_callback a callback that is used to check if the process should proceed given a count of elements in the list. It should follow the heredescribed signature: bool(uint64_t)
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* @param alloc
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*/
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template<typename applier_cb, typename counter_cb>
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inline parsing_state read_cbor_kv_list(parsing_state state, gp::allocator& alloc, applier_cb callback, counter_cb count_callback = [](uint64_t) -> bool {return true;}) {
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if(!state.size()) return state;
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auto type = cbor_type(((uint8_t)0b11100000 & (uint8_t)*state.begin()) >> 5);
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switch(type) {
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case cbor_type::hmap:
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{
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const auto[size, new_state] = pull_arbitrary_integer_from_cbor(state);
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if(!size.has_value()) return state;
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if(!count_callback(size.value()))return state;
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parsing_state forward = new_state;
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for(auto idx = 0ull; idx != size.value(); idx++) {
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if(forward.size() < 2ull) return state;
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forward = callback(forward, alloc);
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forward = callback(forward, alloc);
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}
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return forward;
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}
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default: return state;
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}
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}
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}
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