ICU-22549 Add PluralRule Fuzzer

icu4c/source/test/fuzzer/Makefile.in

@@ -45,6 +45,7 @@ FUZZER_TARGETS = \
  normalizer2_fuzzer \
  number_format_fuzzer \
  number_formatter_fuzzer \
+ plurrule_fuzzer \
  relative_date_time_formatter_fuzzer \
  rule_based_break_iterator_fuzzer \
  timezone_create_fuzzer \

icu4c/source/test/fuzzer/plurrule_fuzzer.cpp

@@ -0,0 +1,82 @@
+// © 2023 and later: Unicode, Inc. and others.
+// License & terms of use: http:https://www.unicode.org/copyright.html
+
+// Fuzzer for ICU PluralRules.
+
+#include <cstring>
+
+#include "fuzzer_utils.h"
+
+#include "unicode/plurrule.h"
+#include "unicode/locid.h"
+
+
+void TestPluralRules(icu::PluralRules* pp, int32_t number, double dbl, UErrorCode& status) {
+ if (U_FAILURE(status)) {
+ return;
+ }
+ pp->select(number);
+ pp->select(dbl);
+}
+
+void TestPluralRulesWithLocale(
+ const icu::Locale& locale, int32_t number, double dbl, UPluralType type, UErrorCode& status) {
+ if (U_FAILURE(status)) {
+ return;
+ }
+ std::unique_ptr<icu::PluralRules> pp(icu::PluralRules::forLocale(locale, status));
+ TestPluralRules(pp.get(), number, dbl, status);
+
+ status = U_ZERO_ERROR;
+ pp.reset(icu::PluralRules::forLocale(locale, type, status));
+ TestPluralRules(pp.get(), number, dbl, status);
+
+ type = static_cast<UPluralType>(
+ static_cast<int>(type) % (static_cast<int>(UPLURAL_TYPE_COUNT)));
+
+ status = U_ZERO_ERROR;
+ pp.reset(icu::PluralRules::forLocale(locale, type, status));
+ TestPluralRules(pp.get(), number, dbl, status);
+}
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
+ uint16_t rnd;
+ int32_t number;
+ double dbl;
+ UPluralType type;
+ if (size > 5000) {
+ size = 5000;
+ }
+ if (size < sizeof(rnd) + sizeof(number) + sizeof(dbl) + sizeof(type)) return 0;
+ icu::StringPiece fuzzData(reinterpret_cast<const char *>(data), size);
+
+ std::memcpy(&rnd, fuzzData.data(), sizeof(rnd));
+ icu::Locale locale = GetRandomLocale(rnd);
+ fuzzData.remove_prefix(sizeof(rnd));
+
+ std::memcpy(&number, fuzzData.data(), sizeof(number));
+ fuzzData.remove_prefix(sizeof(number));
+
+ std::memcpy(&dbl, fuzzData.data(), sizeof(dbl));
+ fuzzData.remove_prefix(sizeof(dbl));
+
+ std::memcpy(&type, fuzzData.data(), sizeof(type));
+ fuzzData.remove_prefix(sizeof(type));
+
+ size_t len = fuzzData.size() / sizeof(char16_t);
+ icu::UnicodeString text(false, reinterpret_cast<const char16_t*>(fuzzData.data()), len);
+
+ UErrorCode status = U_ZERO_ERROR;
+ std::unique_ptr<icu::PluralRules> pp(
+ icu::PluralRules::createRules(text, status));
+ TestPluralRules(pp.get(), number, dbl, status);
+
+ status = U_ZERO_ERROR;
+ TestPluralRulesWithLocale(locale, number, dbl, type, status);
+
+ icu::Locale locale2 = icu::Locale(fuzzData.data());
+
+ status = U_ZERO_ERROR;
+ TestPluralRulesWithLocale(locale2, number, dbl, type, status);
+ return EXIT_SUCCESS;
+}