fuzz: fix -Wshorten-64-to-32 warnings

Ticket: #6186

src/tests/fuzz/fuzz_applayerparserparse.c

@@ -150,7 +150,8 @@ int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
                 goto bail;
             }
             memcpy(isolatedBuffer, albuffer, alnext - albuffer);
-            (void) AppLayerParserParse(NULL, alp_tctx, f, f->alproto, flags, isolatedBuffer, alnext - albuffer);
+            (void)AppLayerParserParse(NULL, alp_tctx, f, f->alproto, flags, isolatedBuffer,
+                    (uint32_t)(alnext - albuffer));
             free(isolatedBuffer);
             if (FlowChangeProto(f)) {
                 // exits if a protocol change is requested
@@ -194,7 +195,8 @@ int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
             goto bail;
         }
         memcpy(isolatedBuffer, albuffer, alsize);
-        (void) AppLayerParserParse(NULL, alp_tctx, f, f->alproto, flags, isolatedBuffer, alsize);
+        (void)AppLayerParserParse(
+                NULL, alp_tctx, f, f->alproto, flags, isolatedBuffer, (uint32_t)alsize);
         free(isolatedBuffer);
     }
 

src/tests/fuzz/fuzz_applayerprotodetectgetproto.c

@@ -61,8 +61,8 @@ int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
     if (data[0] & STREAM_TOSERVER) {
         flags = STREAM_TOSERVER;
     }
-    AppLayerProtoDetectGetProto(
-            alpd_tctx, f, data + HEADER_LEN, size - HEADER_LEN, f->proto, flags, &reverse);
+    AppLayerProtoDetectGetProto(alpd_tctx, f, data + HEADER_LEN, (uint32_t)(size - HEADER_LEN),
+            f->proto, flags, &reverse);
     FlowFree(f);
 
     return 0;

src/tests/fuzz/fuzz_decodebase64.c

@@ -16,7 +16,7 @@ static int initialized = 0;
 
 static void Base64FuzzTest(const uint8_t *src, size_t len)
 {
-    uint32_t decoded_len = SCBase64DecodeBufferSize(len);
+    uint32_t decoded_len = SCBase64DecodeBufferSize((uint32_t)len);
     uint8_t *decoded = SCCalloc(decoded_len, sizeof(uint8_t));
 
     for (uint8_t mode = SCBase64ModeRFC2045; mode <= SCBase64ModeStrict; mode++) {

src/tests/fuzz/fuzz_mimedecparseline.c

@@ -33,10 +33,10 @@ int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
         uint8_t * next = memchr(buffer, '\n', size);
         if (next == NULL) {
             if (SCMimeSmtpGetState(state) >= MimeSmtpBody)
-                (void)SCSmtpMimeParseLine(buffer, size, 0, &events, state);
+                (void)SCSmtpMimeParseLine(buffer, (uint32_t)size, 0, &events, state);
             break;
         } else {
-            (void)SCSmtpMimeParseLine(buffer, next - buffer, 1, &events, state);
+            (void)SCSmtpMimeParseLine(buffer, (uint32_t)(next - buffer), 1, &events, state);
             if (buffer + size < next + 1) {
                 break;
             }