fix(base64): encode: incorrect padding if size % 3 == 2

Doxyfile

@@ -48,7 +48,7 @@ PROJECT_NAME           = libbasen
 # could be handy for archiving the generated documentation or if some version
 # control system is used.
 
-PROJECT_NUMBER         = v1.0.2
+PROJECT_NUMBER         = v1.0.3
 
 # Using the PROJECT_BRIEF tag one can provide an optional one line description
 # for a project that appears at the top of each page and should give viewer a

Makefile

@@ -59,8 +59,6 @@ DIRS =\
 	${OBJDIR}\
 	${OBJDIR}/hash\
 	${LIBDIR}\
-	doc\
-	cov
 
 build: library tools
 
@@ -91,10 +89,10 @@ ${OBJDIR}/%${-g}-cov.o: ${SRCDIR}/%.cpp ${INCDIR}/${LIB}/%.hpp
 	${CC} -o $@ -c $< -I${INCDIR} ${-l} ${CFLAGS} --coverage
 
 ${BINDIR}/%${-g}-cov: ${TESTDIR}/%.cpp ${patsubst %, ${OBJDIR}/%${-g}-cov.o, ${OBJS}}
-	${CC} -o $@ $^ -I${INCDIR} ${-l} -lgtest ${CFLAGS} --coverage
+	${CC} -o $@ $^ -I${INCDIR} ${-l} -lgtest -lgcov ${CFLAGS}
 
 clean:
-	rm -rf ${DIRS}
+	rm -rf ${DIRS} doc cov
 
 ifneq (${OBJS},)
 

src/base64.cpp

@@ -85,7 +85,7 @@ namespace base64
         case 2:
             str[last_idx] = digits[data[data_size - 2] >> 2];
             str[last_idx + 1] = digits[(data[data_size - 2] << 4 | data[data_size - 1] >> 4) & 0x3F];
-            str[last_idx + 2] = digits[data[data_size - 1] & 0x0F];
+            str[last_idx + 2] = digits[data[data_size - 1] << 2 & 0x3F];
             str[last_idx + 3] = '=';
             break;
         default:

test/test-base64.cpp

@@ -21,8 +21,8 @@ TEST(base64, isValid)
 std::vector<std::pair<std::string, std::string>> tests = {
     {"", ""},
     {"BKUEpQ==", "04a504a5"},
-    {"BKUEpQA=", "04a504a500"},
-    {"BKUEpQAA", "04a504a50000"},
+    {"aGVsbG8=", "68656c6c6f"},
+    {"aGVsbG9v", "68656c6c6f6f"},
 };
 TEST(base64, encode)
 {
@@ -49,7 +49,7 @@ TEST(base64, decode)
     EXPECT_THROW(decode("FFF", 3, data.data(), data.size()), std::logic_error);
     EXPECT_THROW(decode("!@#!", 4, data.data(), data.size()), std::logic_error);
     EXPECT_THROW(decode("FF==", 2, data.data(), 0), std::length_error);
-    EXPECT_NO_THROW(decode(""       , 0, data.data(), 0));
+    EXPECT_NO_THROW(decode("", 0, data.data(), 0));
 }
 TEST(base64, decode_1e7)
 {