From 89c8277bbc5c20082e0eaff25c0ee7d6d3c89a48 Mon Sep 17 00:00:00 2001
From: "Claudius \"keldu\" Holeksa" <mail@keldu.de>
Date: Fri, 23 Jun 2023 08:09:41 +0200
Subject: c++, codec: Adding binary transport protocol

---
 src/codec-json/json.tmpl.h |  2 +-
 src/codec/simple.h         | 62 ++++++++++++++++++++++++++++++++++++++++++++++
 src/codec/stream_value.h   | 58 +++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 121 insertions(+), 1 deletion(-)
 create mode 100644 src/codec/simple.h
 create mode 100644 src/codec/stream_value.h

diff --git a/src/codec-json/json.tmpl.h b/src/codec-json/json.tmpl.h
index 0f6c59f..b4e8d6d 100644
--- a/src/codec-json/json.tmpl.h
+++ b/src/codec-json/json.tmpl.h
@@ -6,7 +6,7 @@ namespace saw {
 namespace impl {
 template<typename Schema, typename RootSchema, typename FromEncode>
 class json_encode {
-	static_assert(always_false<Schema, RootSchema, FromEncode>, "This schema type is not being handle by the json encoding.");
+	static_assert(always_false<Schema, RootSchema, FromEncode>, "This schema type is not being handled by the json encoding.");
 };
 
 template<typename T, size_t N, typename RootSchema, typename FromEncode>
diff --git a/src/codec/simple.h b/src/codec/simple.h
new file mode 100644
index 0000000..1b6cf0d
--- /dev/null
+++ b/src/codec/simple.h
@@ -0,0 +1,62 @@
+#pragma once
+
+#include "data.h"
+
+namespace saw {
+namespace encode {
+struct KelSimple {};
+}
+
+template<typename T>
+class data<T, encode::KelSimple> {
+private:
+	ring_buffer buffer_;
+public:
+	data() = default;
+
+	buffer& get_buffer(){
+		return buffer;
+	}
+};
+
+namespace impl {
+template<typename Schema, typename FromEnc>
+class kelsimple_encode {
+	static_assert(always_false<Schema, FromEnc>, "This schema type is not being handled by the kelsimple encoding.");
+};
+
+template<typename T, size_t N, typename Schema, typename FromEnc>
+struct kelsimple_encode<schema::Primitive<T,N>, FromEnc> {
+	static error_or<void> encode(const data<schema::Primitive<T,N>, FromEnc>& from, buffer& to){
+		
+
+		return void_t{};
+	}
+};
+}
+
+template<typename Schema>
+class codec<Schema, encode::KelSimple> {
+public:
+	struct config {
+		size_t depth = 16;
+		size_t length = 1024;
+	};
+private:
+	config cfg_;
+public:
+	codec() = default;
+
+	SAW_FORBID_COPY(codec);
+	SAW_DEFAULT_MOVE(codec);
+
+	template<typename FromEnc>
+	error_or<void> encode(const data<Schema, FromEnc>& from_enc, data<Schema, encode::KelSimple>& to_enc){
+		buffer_view buff_v{to_enc.get_buffer()};
+
+		auto eov = kelsimple_encode::encode(from_env, buff_v);
+
+		return void_t{};
+	}
+};
+}
diff --git a/src/codec/stream_value.h b/src/codec/stream_value.h
new file mode 100644
index 0000000..df1334b
--- /dev/null
+++ b/src/codec/stream_value.h
@@ -0,0 +1,58 @@
+#pragma once
+
+#include "buffer.h"
+#include "error.h"
+
+#include <cstdint>
+#include <cstring>
+
+namespace saw {
+/**
+ * Helper class to encode/decode any primtive type into/from litte endian.
+ * The shift class does this by shifting bytes. This type of procedure is
+ * platform independent. So it does not matter if the memory layout is
+ * little endian or big endian
+ */
+template <typename T, size_t N> class ShiftStreamValue {
+public:
+	inline static error_or<void> decode(typename native_data_type<schema::Primitive<T,N>>::type &val, buffer &buff) {
+		if (buff.read_composite_length() < sizeof(T)) {
+			return make_error<err::buffer_exhausted>();
+		}
+
+		typename native_data_type<schema::Primitive<schema::UnsignedInteger,N>>::type raw = 0;
+
+		for (size_t i = 0; i < sizeof(T); ++i) {
+			raw |= (static_cast<uint64_t>(buff.read(i)) << (i * 8));
+		}
+
+		memcpy(&val, &raw, sizeof(T));
+		buff.read_advance(sizeof(T));
+
+		return void_t{};
+	}
+
+	inline static error_or<void> encode(const typename native_data_type<schema::Primitive<T,N>>::type &val, buffer &buff) {
+		error err = buff.write_require_length(sizeof(T));
+		if (err.failed()) {
+			return err;
+		}
+
+		typename native_data_type<schema::Primitive<schema::UnsignedInteger,N>>::type raw{};
+		memcpy(&raw, &val, sizeof(T));
+
+		for (size_t i = 0; i < sizeof(T); ++i) {
+			buffer.write(i) = raw >> (i * 8);
+		}
+
+		buffer.write_advance(sizeof(T));
+
+		return void_t{};
+	}
+
+	inline static size_t size() const { return N; }
+};
+
+template <typename T> using stream_value = shift_stream_value<T>;
+
+} // namespace saw
-- 
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