Implement Base64 encoding function

test/CMakeLists.txt

@@ -0,0 +1,9 @@
+project(base64-test)
+
+add_custom_target(test "${CMAKE_CURRENT_BINARY_DIR}/${PROJECT_NAME}" "-r compact" "-s" DEPENDS ${PROJECT_NAME})
+include_directories("${CMAKE_CURRENT_SOURCE_DIR}/catch-framework")
+aux_source_directory("src" TEST_SOURCES)
+
+add_executable(${PROJECT_NAME} ${TEST_SOURCES})
+target_link_libraries(${PROJECT_NAME} base64-lib)
+

test/src/test-main.cpp

@@ -0,0 +1,2 @@
+#define CATCH_CONFIG_MAIN
+#include <catch.hpp>

test/src/tests.cpp

@@ -0,0 +1,75 @@
+#include <catch.hpp>
+#include <string>
+#include <iostream>
+
+extern "C" {
+#include <base64-lib/base64-lib.h>
+}
+
+std::string lorem_ipsum = "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Quisque tristique eu nibh eget efficitur."
+			  " Proin pretium, massa in varius malesuada, purus ante pellentesque libero, ut dictum justo enim vel elit."
+			  " Nullam convallis lectus non placerat lobortis. Aliquam consequat mi nulla, eget ultricies nibh ullamcorper at."
+			  " Ut vitae commodo tellus, ut tempor lectus. Etiam vel cursus purus. Etiam ac sagittis nisl, ac mollis mauris."
+			  " Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos."
+			  " Fusce imperdiet malesuada tellus sit amet hendrerit."
+			  " Suspendisse et lacus vehicula, viverra mauris id, scelerisque diam."
+			  " Donec hendrerit mattis neque, non iaculis nisi accumsan quis.";
+std::string base64_reference = "TG9yZW0gaXBzdW0gZG9sb3Igc2l0IGFtZXQsIGNvbnNlY3RldHVyIGFkaXBpc2NpbmcgZWxpdC4g"
+		"UXVpc3F1ZSB0cmlzdGlxdWUgZXUgbmliaCBlZ2V0IGVmZmljaXR1ci4gUHJvaW4gcHJldGl1bSwg"
+		"bWFzc2EgaW4gdmFyaXVzIG1hbGVzdWFkYSwgcHVydXMgYW50ZSBwZWxsZW50ZXNxdWUgbGliZXJv"
+		"LCB1dCBkaWN0dW0ganVzdG8gZW5pbSB2ZWwgZWxpdC4gTnVsbGFtIGNvbnZhbGxpcyBsZWN0dXMg"
+		"bm9uIHBsYWNlcmF0IGxvYm9ydGlzLiBBbGlxdWFtIGNvbnNlcXVhdCBtaSBudWxsYSwgZWdldCB1"
+		"bHRyaWNpZXMgbmliaCB1bGxhbWNvcnBlciBhdC4gVXQgdml0YWUgY29tbW9kbyB0ZWxsdXMsIHV0"
+		"IHRlbXBvciBsZWN0dXMuIEV0aWFtIHZlbCBjdXJzdXMgcHVydXMuIEV0aWFtIGFjIHNhZ2l0dGlz"
+		"IG5pc2wsIGFjIG1vbGxpcyBtYXVyaXMuIENsYXNzIGFwdGVudCB0YWNpdGkgc29jaW9zcXUgYWQg"
+		"bGl0b3JhIHRvcnF1ZW50IHBlciBjb251YmlhIG5vc3RyYSwgcGVyIGluY2VwdG9zIGhpbWVuYWVv"
+		"cy4gRnVzY2UgaW1wZXJkaWV0IG1hbGVzdWFkYSB0ZWxsdXMgc2l0IGFtZXQgaGVuZHJlcml0LiBT"
+		"dXNwZW5kaXNzZSBldCBsYWN1cyB2ZWhpY3VsYSwgdml2ZXJyYSBtYXVyaXMgaWQsIHNjZWxlcmlz"
+		"cXVlIGRpYW0uIERvbmVjIGhlbmRyZXJpdCBtYXR0aXMgbmVxdWUsIG5vbiBpYWN1bGlzIG5pc2kg"
+		"YWNjdW1zYW4gcXVpcy4=";
+
+TEST_CASE("base64/encode", "[ENCODE]")
+{
+	int res;
+	char base64_encoded[2048];
+	size_t output_len;
+
+	res = base64_encode(lorem_ipsum.c_str(), base64_encoded, lorem_ipsum.length(), sizeof(base64_encoded), &output_len);
+	REQUIRE(res == 0);
+
+	if (!res) {
+		base64_encoded[output_len] = 0;
+		REQUIRE(output_len == base64_reference.length());
+		REQUIRE(base64_reference == std::string(base64_encoded));
+	}
+}
+
+TEST_CASE("base64/encoded_size_calc", "[ENCODE]")
+{
+	size_t res;
+
+	res = base64_calculate_encoded_size(1U);
+	REQUIRE(res == 4);
+
+	res = base64_calculate_encoded_size(2U);
+	REQUIRE(res == 4);
+
+	res = base64_calculate_encoded_size(3U);
+	REQUIRE(res == 4);
+
+	res = base64_calculate_encoded_size(4U);
+	REQUIRE(res == 8);
+
+	res = base64_calculate_encoded_size(120U);
+	REQUIRE(res == 160);
+
+	res = base64_calculate_encoded_size(119U);
+	REQUIRE(res == 160);
+}
+
+TEST_CASE("base64/base64_calculate_maximum_decoded_size", "[DECODE]")
+{
+	REQUIRE(base64_calculate_maximum_decoded_size(3) == 0);
+	REQUIRE(base64_calculate_maximum_decoded_size(4) == 3);
+	REQUIRE(base64_calculate_maximum_decoded_size(160) == 120);
+}