ICU-22549 Add UnicodeSet fuzzer

icu4c/source/test/fuzzer/Makefile.in

@@ -50,11 +50,11 @@ FUZZER_TARGETS = \
 		 uloc_get_name_fuzzer \
 		 uloc_is_right_to_left_fuzzer \
 		 uloc_open_keywords_fuzzer \
+		 unicodeset_fuzzer \
 		 unicode_string_codepage_create_fuzzer \
 		 uprop_fuzzer \
 		 uregex_open_fuzzer \
 
-
 OBJECTS = $(FUZZER_TARGETS:%=%.o)
 OBJECTS += fuzzer_driver.o locale_util.o
 

icu4c/source/test/fuzzer/unicodeset_fuzzer.cpp

@@ -0,0 +1,57 @@
+// © 2019 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+
+#include <cstring>
+
+#include "fuzzer_utils.h"
+#include "unicode/coll.h"
+#include "unicode/localpointer.h"
+#include "unicode/uniset.h"
+
+IcuEnvironment* env = new IcuEnvironment();
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
+  UErrorCode status = U_ZERO_ERROR;
+
+  size_t unistr_size = size/2;
+  std::unique_ptr<char16_t[]> fuzzbuff(new char16_t[unistr_size]);
+  std::memcpy(fuzzbuff.get(), data, unistr_size * 2);
+  icu::UnicodeString fuzzstr(false, fuzzbuff.get(), unistr_size);
+
+  icu::LocalPointer<icu::UnicodeSet> set(
+      new icu::UnicodeSet(fuzzstr, status));
+
+  status = U_ZERO_ERROR;
+
+  set.adoptInstead(new icu::UnicodeSet());
+  set->applyPattern (fuzzstr, status);
+
+  set.adoptInstead(new icu::UnicodeSet());
+  set->addAll(fuzzstr);
+
+  set.adoptInstead(new icu::UnicodeSet());
+  set->add(fuzzstr);
+
+  set.adoptInstead(new icu::UnicodeSet());
+  set->retainAll(fuzzstr);
+
+  set.adoptInstead(new icu::UnicodeSet());
+  set->complementAll(fuzzstr);
+
+  set.adoptInstead(new icu::UnicodeSet());
+  set->removeAll(fuzzstr);
+
+  set.adoptInstead(new icu::UnicodeSet());
+  set->retain(fuzzstr);
+
+  set.adoptInstead(new icu::UnicodeSet());
+  set->remove(fuzzstr);
+
+  set.adoptInstead(new icu::UnicodeSet());
+  set->complement(fuzzstr);
+
+  set.adoptInstead(icu::UnicodeSet::createFrom(fuzzstr));
+
+  set.adoptInstead(icu::UnicodeSet::createFromAll(fuzzstr));
+  return 0;
+}