From 7c02d3b8f1e6ec4ee82bdf1220da431b1cd1231e Mon Sep 17 00:00:00 2001
From: Stanislaw Halik <sthalik@misaki.pl>
Date: Fri, 28 Oct 2022 18:08:13 +0200
Subject: serializer work

---
 serialize/binary-reader.hpp | 62 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 serialize/binary-reader.hpp

(limited to 'serialize/binary-reader.hpp')

diff --git a/serialize/binary-reader.hpp b/serialize/binary-reader.hpp
new file mode 100644
index 00000000..3b6eae9a
--- /dev/null
+++ b/serialize/binary-reader.hpp
@@ -0,0 +1,62 @@
+#pragma once
+#include "binary-serializer.hpp"
+#include <iterator>
+
+namespace floormat::Serialize {
+
+union value_u {
+    alignas(alignof(double)) char bytes[8];
+    unsigned char uc;
+    std::uint8_t u8;
+    std::uint16_t u16;
+    std::uint32_t u32;
+    std::uint64_t u64;
+    float f32;
+    double f64;
+};
+
+static_assert(sizeof(value_u) == 8);
+
+template<typename T>
+concept char_sequence = requires(T& x, const T& cx) {
+    requires std::same_as<decltype(std::begin(x)), decltype(std::end(x))>;
+    requires std::same_as<decltype(std::cbegin(cx)), decltype(std::cend(cx))>;
+    requires std::forward_iterator<decltype(std::begin(x))>;
+    requires std::forward_iterator<decltype(std::cbegin(cx))>;
+    requires std::same_as<char, std::decay_t<decltype(*std::begin(x))>>;
+    requires std::same_as<char, std::decay_t<decltype(*std::cbegin(x))>>;
+};
+
+template<typename It>
+concept string_input_iterator = requires(It it) {
+    requires std::forward_iterator<It>;
+    requires std::is_same_v<char, std::decay_t<decltype(*it)>>;
+};
+
+template<string_input_iterator It>
+struct binary_reader final {
+    template<char_sequence Seq> explicit constexpr binary_reader(const Seq& seq) noexcept;
+    constexpr binary_reader(It begin, It end) noexcept;
+    constexpr void assert_end() noexcept;
+
+    template<integer T> constexpr value_u read_u() noexcept;
+    template<std::floating_point T> constexpr value_u read_u() noexcept;
+    template<typename T> T read() noexcept;
+    template<std::size_t N> constexpr std::array<char, N> read() noexcept;
+    constexpr std::size_t bytes_read() const noexcept { return num_bytes_read; }
+
+private:
+    std::size_t num_bytes_read = 0;
+    It it, end;
+};
+
+template<string_input_iterator It, serializable T>
+binary_reader<It>& operator>>(binary_reader<It>& reader, T& x) noexcept;
+
+template<string_input_iterator It> binary_reader(It&& begin, It&& end) -> binary_reader<std::decay_t<It>>;
+
+template<typename Array>
+binary_reader(Array&& array) -> binary_reader<std::decay_t<decltype(std::begin(array))>>;
+
+} // namespace floormat::Serialize
+
-- 
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