Provide an interface for fuzzing sequence producer plugins

tests/fuzz/block_round_trip.c

@@ -23,6 +23,7 @@
 #include "zstd.h"
 #include "zstd_helpers.h"
 #include "fuzz_data_producer.h"
+#include "fuzz_third_party_seq_prod.h"
 
 static ZSTD_CCtx *cctx = NULL;
 static ZSTD_DCtx *dctx = NULL;
@@ -54,6 +55,8 @@ static size_t roundTripTest(void *result, size_t resultCapacity,
 
 int LLVMFuzzerTestOneInput(const uint8_t *src, size_t size)
 {
+    FUZZ_SEQ_PROD_SETUP();
+
     /* Give a random portion of src data to the producer, to use for
     parameter generation. The rest will be used for (de)compression */
     FUZZ_dataProducer_t *producer = FUZZ_dataProducer_create(src, size);
@@ -95,5 +98,6 @@ int LLVMFuzzerTestOneInput(const uint8_t *src, size_t size)
     ZSTD_freeCCtx(cctx); cctx = NULL;
     ZSTD_freeDCtx(dctx); dctx = NULL;
 #endif
+    FUZZ_SEQ_PROD_TEARDOWN();
     return 0;
 }