[PercentEncoding] Add minimal percent encoding/decoding functions

Tests/PercentEncoding/CMakeLists.txt

@@ -0,0 +1,17 @@
+add_executable(TestPercentEncoding)
+
+target_compile_features(TestPercentEncoding
+    PRIVATE
+    cxx_std_20
+)
+
+target_link_libraries(TestPercentEncoding
+    PRIVATE
+    Garbage
+    Catch2::Catch2WithMain
+)
+
+target_sources(TestPercentEncoding
+    PRIVATE
+    Tests.cpp
+)

Tests/PercentEncoding/Tests.cpp

@@ -0,0 +1,71 @@
+#include <catch2/catch_test_macros.hpp>
+#include <Garbage/PercentEncoding.hpp>
+
+TEST_CASE("Percent encoding/decoding tests")
+{
+    SECTION("Empty span")
+    {
+        std::vector<std::uint8_t> data;
+
+        std::string encoded = Garbage::Percent::Encode(data);
+        REQUIRE(encoded.size() == 0);
+
+        REQUIRE(Garbage::Percent::Validate(encoded));
+
+        std::vector<std::uint8_t> decoded = Garbage::Percent::Decode(encoded);
+        REQUIRE(encoded.size() == 0);
+    }
+
+    SECTION("Validation rejections")
+    {
+        constexpr std::string_view invalid1 = "Random chars";
+        REQUIRE_FALSE(Garbage::Percent::Validate(invalid1));
+
+        constexpr std::string_view invalid2 = "%AFFAF%AF";
+        REQUIRE_FALSE(Garbage::Percent::Validate(invalid2));
+    }
+
+    SECTION("Encoding short data")
+    {
+        constexpr std::string_view source("日");
+        std::vector<std::uint8_t> data(source.begin(), source.end());
+
+        std::string encoded = Garbage::Percent::Encode(data);
+
+        REQUIRE(encoded == "%E6%97%A5");
+        REQUIRE(Garbage::Percent::Validate(encoded));
+    }
+
+    SECTION("Decoding short data")
+    {
+        std::string data("%E6%97%A5");
+
+        REQUIRE(Garbage::Percent::Validate(data));
+
+        std::vector<std::uint8_t> decoded = Garbage::Percent::Decode(data);
+        std::string destination(decoded.begin(), decoded.end());
+        REQUIRE(destination == "日");
+    }
+
+    SECTION("Encoding longer data")
+    {
+        constexpr std::string_view source("日男昼持賃竹田");
+        std::vector<std::uint8_t> data(source.begin(), source.end());
+
+        std::string encoded = Garbage::Percent::Encode(data);
+
+        REQUIRE(encoded == "%E6%97%A5%E7%94%B7%E6%98%BC%E6%8C%81%E8%B3%83%E7%AB%B9%E7%94%B0");
+        REQUIRE(Garbage::Percent::Validate(encoded));
+    }
+
+    SECTION("Decoding longer data")
+    {
+        std::string data("%E6%97%A5%E7%94%B7%E6%98%BC%E6%8C%81%E8%B3%83%E7%AB%B9%E7%94%B0");
+
+        REQUIRE(Garbage::Percent::Validate(data));
+
+        std::vector<std::uint8_t> decoded = Garbage::Percent::Decode(data);
+        std::string destination(decoded.begin(), decoded.end());
+        REQUIRE(destination == "日男昼持賃竹田");
+    }
+}