test/fuzzer: a simple fuzzer using libFuzzer

This commit adds some basic infrastructure for fuzzers, and adds a
fuzzer for the CUE sheet parser.

test/fuzzer/FuzzCueParser.cxx

@@ -0,0 +1,26 @@
+#include "playlist/cue/CueParser.hxx"
+#include "util/IterableSplitString.hxx"
+
+#include <string>
+#include <string_view>
+
+extern "C" {
+int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size);
+}
+
+int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
+{
+	CueParser parser;
+
+	const std::string_view src{(const char *)data, size};
+
+	for (const auto line : IterableSplitString(src, '\n')) {
+		parser.Feed(std::string(line).c_str());
+		parser.Get();
+	}
+
+	parser.Finish();
+	parser.Get();
+
+	return 0;
+}