wip binary serializer

1 files changed, 86 insertions, 0 deletions

diff --git a/serialize/binary-serializer.cpp b/serialize/binary-serializer.cpp
new file mode 100644
index 00000000..08606768
--- /dev/null
+++ b/serialize/binary-serializer.cpp
@@ -0,0 +1,86 @@
+#include "binary-serializer.inl"
+#include <array>
+
+namespace floormat::Serialize {
+
+#if 0
+template<std::size_t N>
+struct byte_array_iterator final
+{
+    using iterator_category = std::forward_iterator_tag;
+    using difference_type   = std::ptrdiff_t;
+    using value_type        = char;
+    using pointer           = char*;
+    using reference         = char&;
+
+    constexpr byte_array_iterator(char (&buf)[N]) : buf{&buf}, i{0} {}
+    constexpr byte_array_iterator(char (&buf)[N], std::size_t i) : buf{&buf}, i{i} {}
+
+    constexpr reference operator*() const { fm_assert(i < N); return (*buf)[i]; }
+    constexpr pointer operator->() { fm_assert(i < N); return &(*buf)[i]; }
+    constexpr byte_array_iterator<N>& operator++() noexcept { i++; return *this; }
+    constexpr byte_array_iterator<N> operator++(int) noexcept { byte_array_iterator<N> tmp = *this; ++(*this); return tmp; }
+    friend constexpr bool operator==(const byte_array_iterator<N>&& a, const byte_array_iterator<N>&& b) noexcept = default;
+
+private:
+    char (*buf)[N];
+    std::size_t i;
+};
+
+template struct byte_array_iterator<sizeof(double)>;
+#endif
+
+struct value_buf final {
+    value_u value;
+    std::int8_t len;
+
+    explicit constexpr value_buf(value_u value, std::int8_t len) : value{value}, len{len} {}
+    constexpr bool operator==(const value_buf& o) const noexcept;
+
+    fm_DECLARE_DEFAULT_MOVE_ASSIGNMENT_(value_buf);
+    fm_DECLARE_DEFAULT_COPY_ASSIGNMENT(value_buf);
+};
+
+constexpr bool value_buf::operator==(const value_buf& o) const noexcept
+{
+    const auto N = len;
+    if (N != o.len)
+        return false;
+    for (std::int8_t i = 0; i < N; i++)
+        if (value.bytes[i] != o.value.bytes[i])
+            return false;
+    return true;
+}
+
+[[maybe_unused]]
+static constexpr bool test1()
+{
+    constexpr std::array<char, 4> bytes = { 1, 0, 1, 0 };
+    auto x = binary_reader(bytes.cbegin(), bytes.cend());
+    return x.read_u<unsigned char>().bytes[0] == 1 &&
+           x.read_u<unsigned char>().bytes[0] == 0 &&
+           x.read_u<unsigned char>().bytes[0] == 1 &&
+           x.read_u<unsigned char>().bytes[0] == 0;
+}
+static_assert(test1());
+
+[[maybe_unused]]
+static constexpr bool test2()
+{
+    constexpr std::array<char, 4> bytes = { 1, 0, 1, 0 };
+    auto r = binary_reader(bytes.cbegin(), bytes.cend());
+    const auto x = r.read_u<int>();
+    return x.bytes[0] == 1 && x.bytes[1] == 0 && x.bytes[2] == 1 && x.bytes[3] == 0;
+}
+static_assert(test2());
+
+template<typename T>
+[[maybe_unused]] static constexpr T maybe_byteswap(T x)
+{
+    if constexpr(std::endian::native == std::endian::big)
+        return std::byteswap(x);
+    else
+        return x;
+}
+
+} // namespace floormat::Serialize