1 files changed, 112 insertions, 0 deletions
diff --git a/serialize/packbits-read.cpp b/serialize/packbits-read.cpp
new file mode 100644
index 00000000..f21a0de9
--- /dev/null
+++ b/serialize/packbits-read.cpp
@@ -0,0 +1,112 @@
+#include "packbits-read.hpp"
+#include "compat/assert.hpp"
+
+namespace floormat {
+
+using namespace floormat::detail_Pack_input;
+
+namespace {
+
+template<std::unsigned_integral T, size_t N> constexpr inline T lowbits = (T{1} << N)-T{1};
+
+static_assert(!input<uint32_t, 3>{65535}.check_zero());
+static_assert(input<uint32_t, 30>{65535}.advance<16>() == 0);
+
+static_assert(input<uint32_t, 30>::next<16>{ input<uint32_t, 30>{65535}.advance<16>() }.check_zero());
+static_assert(input<uint32_t, 30>::next<16>{}.Capacity == 14);
+
+constexpr bool test1()
+{
+    constexpr size_t bits[] = { 5, 2, 1 };
+    constexpr size_t vals[] = { 8, 3, 1, 0 };
+
+    constexpr auto S0 = input<uint8_t, vals[0]>{0b10111011};
+    constexpr auto S1 = input<uint8_t, vals[1]>{0b00000101};
+    constexpr auto S2 = input<uint8_t, vals[2]>{0b00000001};
+    constexpr auto S3 = input<uint8_t, vals[3]>{0b00000000};
+
+    using P0 = std::decay_t<decltype(S0)>;
+    using P1 = P0::next<bits[0]>;
+    using P2 = P1::next<bits[1]>;
+    using P3 = P2::next<bits[2]>;
+
+    static_assert(std::is_same_v<P0, input<uint8_t, vals[0]>>);
+    static_assert(std::is_same_v<P1, input<uint8_t, vals[1]>>);
+    static_assert(std::is_same_v<P2, input<uint8_t, vals[2]>>);
+    static_assert(std::is_same_v<P3, input<uint8_t, vals[3]>>);
+
+    static_assert(S0.advance<      0>() == S0.value);
+    static_assert(S0.advance<bits[0]>() == S1.value);
+    static_assert(S1.advance<bits[1]>() == S2.value);
+    static_assert(S2.advance<bits[2]>() == S3.value);
+
+    static_assert(S0.get<bits[0]>() == (S0.value & (1<<bits[0])-1));
+    static_assert(S1.get<bits[1]>() == (S1.value & (1<<bits[1])-1));
+    static_assert(S2.get<bits[2]>() == (S2.value & (1<<bits[2])-1));
+    static_assert(S3.check_zero());
+
+    return true;
+}
+static_assert(test1());
+
+constexpr bool test3()
+{
+    constexpr auto S0 = input<uint16_t, 16>{0b1110100110001011};
+    constexpr auto S1 = input<uint16_t,  4>{0b1110};
+    constexpr auto S2 = input<uint16_t,  1>{0b1};
+
+    static_assert(S0.get<12>() == 0b100110001011);
+    static_assert(S0.advance<12>() == S1.value);
+
+    static_assert(S1.get<3>() == 0b110);
+    static_assert(S1.advance<3>() == S2.value);
+
+    static_assert(S2.get<1>() == 0b1);
+    static_assert(S2.advance<1>() == 0);
+
+    return true;
+}
+static_assert(test3());
+
+static_assert(std::is_same_v< make_tuple_type<uint8_t, 3>,  std::tuple<uint8_t, uint8_t, uint8_t> >);
+
+constexpr bool test4()
+{
+    using Tuple_u32 = make_tuple_type<uint32_t, 3>;
+    static_assert(std::is_same_v<Tuple_u32, std::tuple<uint32_t, uint32_t, uint32_t>>);
+    using Tuple_u8  = make_tuple_type<uint8_t, 3>;
+    {
+        Tuple_u32 tuple{};
+        static_assert(lowbits<uint32_t, 17> == 0x1ffffU);
+        read_(tuple, input<uint32_t, 32>{(uint32_t)-1}, std::make_index_sequence<3>{}, make_pack<uint32_t, 17, 14, 1>{});
+        auto [a, b, c] = tuple;
+        fm_assert(a == lowbits<uint32_t, 17>);
+        fm_assert(b == lowbits<uint32_t, 14>);
+        fm_assert(c & 1);
+    }
+    {
+        Tuple_u8 tuple{};
+        read_(tuple, input<uint8_t, 8>{0b101011}, std::make_index_sequence<3>{}, make_pack<uint8_t, 1, 3, 2>{});
+        auto [a, b, c] = tuple;
+        fm_assert(a == 0b1);
+        fm_assert(b == 0b101);
+        fm_assert(c == 0b10);
+    }
+    {
+        std::tuple<> empty_tuple;
+        read_(empty_tuple, input<uint8_t, 8>{0}, std::index_sequence<>{}, make_pack<uint8_t>{});
+        Tuple_u8 tuple{}; (void)tuple;
+        //read_(empty_tuple, input<uint8_t, 8>{1}, std::index_sequence<>{}, make_tuple<uint8_t>{});
+        //read_(tuple, input<uint8_t, 5>{0b11111}, std::make_index_sequence<3>{}, make_tuple<uint8_t, 2, 2, 2>{});
+        //(void)input<uint8_t, 9>{};
+        //read_(empty_tuple, input<uint8_t, 8>{}, std::index_sequence<0>{}, make_tuple<uint8_t, 1>{});
+        //read_(empty_tuple, input<uint8_t, 8>{1}, std::index_sequence<>{}, make_tuple<uint8_t, 1>{});
+    }
+
+    return true;
+}
+static_assert(test4());
+
+} // namespace
+
+} // namespace floormat