From 1502b61d080102e27a477b017aed2f089d36f121 Mon Sep 17 00:00:00 2001
From: Ludovic 'Archivist' Lagouardette <ludovic@nekoit.xyz>
Date: Sat, 17 Oct 2020 02:12:05 +0200
Subject: [PATCH] Parsing uint and nint

---
 include/gp/enveloppe/cbor.hpp | 90 +++++++++++++++++++++++++++++++++++
 1 file changed, 90 insertions(+)

diff --git a/include/gp/enveloppe/cbor.hpp b/include/gp/enveloppe/cbor.hpp
index 0b3dc45..9289258 100644
--- a/include/gp/enveloppe/cbor.hpp
+++ b/include/gp/enveloppe/cbor.hpp
@@ -68,6 +68,11 @@ namespace gp {
 		: sign{v < 0}
 		, value{uint64_t((sign ? -1 : 1) * v)}
 		{}
+
+		cbor_number(bool s, uint64_t v) 
+		: sign{s}
+		, value{v}
+		{}
 	};
 
 	struct ieee754_hf final {
@@ -112,6 +117,11 @@ namespace gp {
 		, alloc(alloc_v)
 		{}
 
+		cbor_value(cbor_composite<cbor_value> val, allocator& alloc_v)
+		: contents(val)
+		, alloc(alloc_v)
+		{}
+
 		cbor_value(const cbor_value& oth)
 		: contents(oth.contents)
 		, alloc(oth.alloc)
@@ -159,6 +169,86 @@ namespace gp {
 			return gp::vector<gp::pair<cbor_value, cbor_value>>{alloc};
 		}
 
+		static gp::pair<cbor_value, gp::buffer<std::byte>::associated_iterator> decode(allocator& alloc, gp::buffer<std::byte> src) {
+			#define ERROR return {cbor_value{undefined_t{}, alloc}, src.begin()}
+			if(src.size()==0) ERROR;
+			auto discriminant = (cbor_type)(((uint8_t)*src.begin()) >> 5);
+			auto local = uint8_t(((uint8_t)*src.begin()) & 0b00011111);
+			switch(discriminant) {
+				case cbor_type::uint: 
+				case cbor_type::nint: {
+					if(local <= 23) {
+						return {cbor_value{cbor_number{(bool)discriminant, local}, alloc}, src.begin()+1};
+					} else {
+						switch((cbor_oths)local) {
+							case cbor_oths::byte: {
+								if(src.size()<2) ERROR;
+								return {
+									cbor_value{
+										cbor_number{(bool)discriminant, (uint8_t)*(src.begin()+1)}, 
+										alloc
+									}, 
+									src.begin()+2
+								};
+							}
+							case cbor_oths::word: {
+								if(src.size()<3) ERROR;
+								return {
+									cbor_value{
+										cbor_number{(bool)discriminant, uint16_t(*(gp::endian_wrapper<uint16_t, endian::big>*)(src.begin().data))}, 
+										alloc
+									}, 
+									src.begin()+3
+								};
+							}
+							case cbor_oths::dword: {
+								if(src.size()<5) ERROR;
+								return {
+									cbor_value{
+										cbor_number{(bool)discriminant, uint32_t(*(gp::endian_wrapper<uint32_t, endian::big>*)(src.begin().data))}, 
+										alloc
+									}, 
+									src.begin()+5
+								};
+							}
+							case cbor_oths::qword: {
+								if(src.size()<9) ERROR;
+								return {
+									cbor_value{
+										cbor_number{(bool)discriminant, uint64_t(*(gp::endian_wrapper<uint64_t, endian::big>*)(src.begin().data))}, 
+										alloc
+									}, 
+									src.begin()+9
+								};
+							}
+							default: {
+								ERROR;
+							}
+						}	
+					}
+				}
+				case cbor_type::bstr: {
+					
+				}
+				case cbor_type::tstr: {
+					ERROR;
+				}
+				case cbor_type::list: {
+					
+				}
+				case cbor_type::hmap: {
+					
+				}
+				case cbor_type::tags: {
+					
+				}
+				case cbor_type::oths: {
+					
+				}
+			}
+			ERROR;
+		}
+
 		static auto encode_float(buffer<std::byte> dest, cbor_floating_point& value) {
 			switch(value.type()) {
 				case cbor_floating_point::alt<ieee754_hf>():{