ICU-22549 Add fuzzer for NumberFormatter

icu4c/source/test/fuzzer/Makefile.in

@@ -42,6 +42,7 @@ FUZZER_TARGETS = \
  list_format_fuzzer locale_fuzzer \
  locale_morph_fuzzer \
  number_format_fuzzer \
+ number_formatter_fuzzer \
  relative_date_time_formatter_fuzzer \
  rule_based_break_iterator_fuzzer \
  ucasemap_fuzzer \

icu4c/source/test/fuzzer/number_formatter_fuzzer.cpp

@@ -0,0 +1,45 @@
+// © 2019 and later: Unicode, Inc. and others.
+// License & terms of use: http:https://www.unicode.org/copyright.html
+
+#include <cstring>
+
+#include "fuzzer_utils.h"
+#include "unicode/localpointer.h"
+#include "unicode/numberformatter.h"
+
+IcuEnvironment* env = new IcuEnvironment();
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
+ UErrorCode status = U_ZERO_ERROR;
+
+ int16_t rnd;
+ int64_t value;
+ double doubleValue;
+ if (size < sizeof(rnd) + sizeof(value) + sizeof(doubleValue)) 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(&value, fuzzData.data(), sizeof(value));
+ fuzzData.remove_prefix(sizeof(value));
+
+ std::memcpy(&doubleValue, fuzzData.data(), sizeof(doubleValue));
+ fuzzData.remove_prefix(sizeof(doubleValue));
+
+ size_t len = fuzzData.size() / sizeof(char16_t);
+ icu::UnicodeString fuzzstr(false, reinterpret_cast<const char16_t*>(fuzzData.data()), len);
+
+ icu::number::UnlocalizedNumberFormatter unf = icu::number::NumberFormatter::forSkeleton(
+ fuzzstr, status);
+
+ icu::number::LocalizedNumberFormatter nf = unf.locale(locale);
+
+ status = U_ZERO_ERROR;
+ nf.formatInt(value, status);
+
+ status = U_ZERO_ERROR;
+ nf.formatDouble(doubleValue, status);
+ return 0;
+}