Base64_test.cc

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#include "catch.hpp"
 
#include "Base64.hh"
 
#include "ranges.hh"
 
#include <bit>
 
static void test_decode(const std::string& encoded, const std::string& decoded)
{
        auto [buf, bufSize] = Base64::decode(encoded);
        REQUIRE(bufSize == decoded.size());
        CHECK(ranges::equal(std::span{buf.data(), bufSize}, decoded));
}
 
static void test(const std::string& decoded, const std::string& encoded)
{
        CHECK(Base64::encode(std::span{std::bit_cast<const uint8_t*>(decoded.data()),
                                       decoded.size()})
              == encoded);
        test_decode(encoded, decoded);
}
 
TEST_CASE("Base64")
{
        // Test vectors verified with 'base64' tool from coreutils.
        test("", "");
        test("a", "YQ==");
        test("a\n", "YQo=");
        test("ab\n", "YWIK");
        test("abc\n", "YWJjCg==");
        test("0123456789\n", "MDEyMzQ1Njc4OQo=");
        test("abcdefghijklmnopqrstuvwxyz\n", "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXoK");
        test("0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz\n",
             "MDEyMzQ1Njc4OUFCQ0RFRkdISUpLTE1OT1BRUlNUVVZXWFlaYWJjZGVmZ2hpamtsbW5vcHFyc3R1\n"
             "dnd4eXoK");
        test("111111111111111111111111111111111111111111111111111111111111111111111111111111"
             "111111111111111111111111111111111111111111111111111111111111111111111111111111"
             "111111111111111111111111111111111111111111111111111111111111111111111111111111"
             "111111111111111111111111111111111111111111111\n",
             "MTExMTExMTExMTExMTExMTExMTExMTExMTExMTExMTExMTExMTExMTExMTExMTExMTExMTExMTEx\n"
             "MTExMTExMTExMTExMTExMTExMTExMTExMTExMTExMTExMTExMTExMTExMTExMTExMTExMTExMTEx\n"
             "MTExMTExMTExMTExMTExMTExMTExMTExMTExMTExMTExMTExMTExMTExMTExMTExMTExMTExMTEx\n"
             "MTExMTExMTExMTExMTExMTExMTExMTExMTExMTExMTExMTExMTExMTExMTExMTExMTExMTExMTEx\n"
             "MTExMTExMTExMTExMTExMTExMTExMTExMTExMTExMTExMTExMTExMTExMTExMTExMTExCg==");
 
        // Decode-only:
        // - extra newlines don't matter
        test_decode("M\nDEyM\nzQ1Njc\n4OQo=", "0123456789\n");
        // - no newlines at all is fine as well
        test_decode("MDEyMzQ1Njc4OUFCQ0RFRkdISUpLTE1OT1BRUlNUVVZXWFlaYWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXoK",
                    "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz\n");
}