From f5629bf0da55ebaaddc5cf551c36ed7362dc54b5 Mon Sep 17 00:00:00 2001
From: "Claudius \"keldu\" Holeksa" <mail@keldu.de>
Date: Tue, 20 Jun 2023 09:05:08 +0200
Subject: c++: Adding tests and working around some constness problems

---
 src/codec-json/json.h      |  8 ++++++-
 src/codec-json/json.tmpl.h | 52 ++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 59 insertions(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/codec-json/json.h b/src/codec-json/json.h
index f547e54..58b64aa 100644
--- a/src/codec-json/json.h
+++ b/src/codec-json/json.h
@@ -24,6 +24,10 @@ public:
 		return buffer_;
 	}
 
+	const buffer& get_buffer() const {
+		return buffer_;
+	}
+
 	error push(uint8_t val){
 		return buffer_.push(val);
 	}
@@ -86,7 +90,9 @@ public:
 	}
 
 	template <typename ToEncoding>
-	error_or<void> decode(const data<Schema, encode::Json>& from_decode, data<Schema, ToEncoding>& to_decode){
+	error_or<void> decode(data<Schema, encode::Json>& from_decode, data<Schema, ToEncoding>& to_decode){
+		buffer_view buff_v{from_decode.get_buffer()};
+
 		return void_t {};
 	}
 };
diff --git a/src/codec-json/json.tmpl.h b/src/codec-json/json.tmpl.h
index f5788e7..b8cd7aa 100644
--- a/src/codec-json/json.tmpl.h
+++ b/src/codec-json/json.tmpl.h
@@ -38,6 +38,58 @@ struct json_encode<schema::Primitive<T,N>, RootSchema, FromEncode>  {
 
 		return void_t{};
 	}
+
+	static error_or<void> decode(buffer_view& buff, data<schema::Primitive<T,N>, FromEncode>& to){
+		assert((buff.read() >= '0' && buff.read() <= '9') ||
+		   buff.read() == '+' || buff.read() == '-');
+
+		std::size_t offset = 0;
+
+		if(buff.read() == '-'){
+			++offset;
+		}else if(buff.read() == '+'){
+			return make_error<err::not_supported>();
+		}
+		if (offset >= buff.read_composite_length()) {
+			return make_error<err::buffer_exhausted>();
+		}
+		if(buff.read(offset) >= '1' && buff.read(offset) <= '9'){
+			++offset;
+
+			if(offset >= buff.read_composite_length()){
+				return make_error<err::buffer_exhausted>();
+			}
+
+			while(1){
+				if (buff.read(offset) >= '0' && buff.read(offset) <= '9'){
+					++offset;
+
+					if(offset >= buff.read_composite_length()){
+						return make_error<err::buffer_exhausted>();
+					}
+					continue;
+				}
+				break;
+			}
+		}else if (buff.read(offset) == '0' ){
+			++offset;
+		}else{
+			return make_error<err::buffer_exhausted>();
+		}
+
+		{
+			std::string_view num_view{reinterpret_cast<char*>(&buff.read()), offset};
+			typename native_data_type<schema::Primitive<T,N>>::type result;
+			auto fc_result = std::from_chars(num_view.data(), num_view.data() + num_view.size(), result);
+			if(fc_result.ec != std::errc{}){
+				return make_error<err::invalid_state>();
+			}
+
+			to.set(result);
+		}
+
+		return void_t{};
+	}	
 };
 
 template<typename RootSchema, typename FromEncode>
-- 
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