[Fuzz] Improve data generation #1723

Converting the rest of the tests to use the new data producer.

tests/fuzz/dictionary_decompress.c

@@ -18,12 +18,13 @@
 #include <stdio.h>
 #include "fuzz_helpers.h"
 #include "zstd_helpers.h"
+#include "fuzz_data_producer.h"
 
 static ZSTD_DCtx *dctx = NULL;
 
 int LLVMFuzzerTestOneInput(const uint8_t *src, size_t size)
 {
-    uint32_t seed = FUZZ_seed(&src, &size);
+    FUZZ_dataProducer_t *producer = FUZZ_dataProducer_create(src, size);
     FUZZ_dict_t dict;
     ZSTD_DDict* ddict = NULL;
     int i;
@@ -32,19 +33,19 @@ int LLVMFuzzerTestOneInput(const uint8_t *src, size_t size)
         dctx = ZSTD_createDCtx();
         FUZZ_ASSERT(dctx);
     }
-    dict = FUZZ_train(src, size, &seed);
-    if (FUZZ_rand32(&seed, 0, 1) == 0) {
+    dict = FUZZ_train(src, size, producer);
+    if (FUZZ_dataProducer_uint32Range(producer, 0, 1) == 0) {
         ddict = ZSTD_createDDict(dict.buff, dict.size);
         FUZZ_ASSERT(ddict);
     } else {
         FUZZ_ZASSERT(ZSTD_DCtx_loadDictionary_advanced(
                 dctx, dict.buff, dict.size,
-                (ZSTD_dictLoadMethod_e)FUZZ_rand32(&seed, 0, 1),
-                (ZSTD_dictContentType_e)FUZZ_rand32(&seed, 0, 2)));
+                (ZSTD_dictLoadMethod_e)FUZZ_dataProducer_uint32Range(producer, 0, 1),
+                (ZSTD_dictContentType_e)FUZZ_dataProducer_uint32Range(producer, 0, 2)));
     }
     /* Run it 10 times over 10 output sizes. Reuse the context and dict. */
     for (i = 0; i < 10; ++i) {
-        size_t const bufSize = FUZZ_rand32(&seed, 0, 2 * size);
+        size_t const bufSize = FUZZ_dataProducer_uint32Range(producer, 0, 2 * size);
         void* rBuf = malloc(bufSize);
         FUZZ_ASSERT(rBuf);
         if (ddict) {
@@ -55,6 +56,7 @@ int LLVMFuzzerTestOneInput(const uint8_t *src, size_t size)
         free(rBuf);
     }
     free(dict.buff);
+    FUZZ_dataProducer_free(producer);
     ZSTD_freeDDict(ddict);
 #ifndef STATEFUL_FUZZING
     ZSTD_freeDCtx(dctx); dctx = NULL;