tinycss2: add components fuzzer (#9760)

Signed-off-by: David Korczynski <david@adalogics.com>

projects/tinycss2/fuzz_components.py

@@ -0,0 +1,68 @@
+#!/usr/bin/python3
+# Copyright 2023 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+import sys
+import atheris
+import tinycss2
+
+
+def TestOneInput(data):
+  fdp = atheris.FuzzedDataProvider(data)
+
+  source_to_parse = fdp.ConsumeUnicodeNoSurrogates(sys.maxsize)
+  skip_comments = fdp.ConsumeBool()
+  skip_whitespace = fdp.ConsumeBool()
+
+  tinycss2.parse_one_component_value(
+    source_to_parse,
+    skip_comments
+  )
+
+  tinycss2.parse_one_component_value(
+    source_to_parse,
+    skip_comments
+  )
+
+  tinycss2.parse_declaration_list(
+    source_to_parse,
+    skip_comments,
+    skip_whitespace
+  )
+
+  tinycss2.parse_one_rule(
+    source_to_parse,
+    skip_comments,
+  )
+
+  tinycss2.parse_rule_list(
+    source_to_parse,
+    skip_comments,
+    skip_whitespace
+  )
+
+  tinycss2.parse_stylesheet(
+    source_to_parse,
+    skip_comments,
+    skip_whitespace
+  )
+
+
+def main():
+  atheris.instrument_all()
+  atheris.Setup(sys.argv, TestOneInput)
+  atheris.Fuzz()
+
+
+if __name__ == "__main__":
+  main()