Add fuzzer for C wrapper (#689)

fuzz/ada_c.c

@@ -0,0 +1,65 @@
+#include "ada_c.h"
+
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
+  /**
+   * ada_c
+   */
+  ada_url out = ada_parse((char*)data, size);
+  bool is_valid = ada_is_valid(out);
+
+  if (is_valid) {
+    ada_set_href(out, (char*)data, size);
+    ada_set_host(out, (char*)data, size);
+    ada_set_hostname(out, (char*)data, size);
+    ada_set_protocol(out, (char*)data, size);
+    ada_set_username(out, (char*)data, size);
+    ada_set_password(out, (char*)data, size);
+    ada_set_port(out, (char*)data, size);
+    ada_set_pathname(out, (char*)data, size);
+    ada_set_search(out, (char*)data, size);
+    ada_set_hash(out, (char*)data, size);
+
+    ada_get_hash(out);
+    ada_get_host(out);
+    ada_get_host_type(out);
+    ada_get_hostname(out);
+    ada_get_href(out);
+    ada_owned_string out_get_origin = ada_get_origin(out);
+    ada_get_pathname(out);
+    ada_get_username(out);
+    ada_get_password(out);
+    ada_get_protocol(out);
+    ada_get_port(out);
+    ada_get_search(out);
+    ada_get_scheme_type(out);
+
+    ada_has_credentials(out);
+    ada_has_empty_hostname(out);
+    ada_has_hostname(out);
+    ada_has_non_empty_username(out);
+    ada_has_non_empty_password(out);
+    ada_has_port(out);
+    ada_has_password(out);
+    ada_has_hash(out);
+    ada_has_search(out);
+
+    ada_get_components(out);
+
+    ada_clear_port(out);
+    ada_clear_hash(out);
+    ada_clear_search(out);
+
+    ada_free_owned_string(out_get_origin);
+  }
+
+  bool can_parse_result = ada_can_parse((char*)data, size);
+
+  ada_free(out);
+
+  return 0;
+}

fuzz/ada_c.options

@@ -0,0 +1,3 @@
+[libfuzzer]
+dict = url.dict
+max_len = 1024

fuzz/build.sh

@@ -37,4 +37,16 @@ $CXX $CFLAGS $CXXFLAGS \
 $CXX $CFLAGS $CXXFLAGS $LIB_FUZZING_ENGINE url_search_params.o \
      -o $OUT/url_search_params
 
+$CXX $CFLAGS $CXXFLAGS \
+     -std=c++17 \
+     -I build/singleheader \
+     -c build/singleheader/ada.cpp -o ada.o
+
+$CC $CFLAGS $CXXFLAGS \
+     -I build/singleheader \
+     -c fuzz/ada_c.c -o ada_c.o
+
+$CXX $CFLAGS $CXXFLAGS $LIB_FUZZING_ENGINE ./ada.o ada_c.o \
+     -o $OUT/ada_c
+
 cp $SRC/ada-url/fuzz/*.dict $SRC/ada-url/fuzz/*.options $OUT/