add fuzz target

fuzzing/cjson_read_fuzzer.cc

@@ -0,0 +1,41 @@
+#include <stdlib.h>
+#include <stdint.h>
+
+#include "../cJSON.h"
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size)
+{
+    if((data[0] == '\0') || (size < 3) || (data[1] == '\0')) return 0;
+
+    cJSON *json = cJSON_Parse((const char*)data + 2);
+
+    if(json == NULL) return 0;
+
+    int do_format = 0;
+    char *printed_json = NULL;
+
+    if(data[1] == 'f') do_format = 1;
+
+    if(data[0] == 'b')
+    {
+        /* buffered printing */
+        printed_json = cJSON_PrintBuffered(json, 1, do_format);
+    }
+    else
+    {
+        /* unbuffered printing */
+        if(do_format)
+        {
+            printed_json = cJSON_Print(json);
+        }
+        else
+        {
+            printed_json = cJSON_PrintUnformatted(json);
+        }
+    }
+
+    if(printed_json != NULL) free(printed_json);
+    cJSON_Delete(json);
+
+    return 0;
+}