MDNS-Fuzzer: AFL fuzzer tests for mdsn packet parser

* Original commit: espressif/esp-idf@e983230be9

components/mdns/test_afl_fuzz_host/esp32_mock.c

@@ -0,0 +1,84 @@
+#include <stdio.h>
+#include <string.h>
+#include <pthread.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include "esp32_compat.h"
+
+void*     g_queue;
+int       g_queue_send_shall_fail = 0;
+int       g_size = 0;
+
+esp_err_t esp_timer_delete(esp_timer_handle_t timer)
+{
+    return ESP_OK;
+}
+
+esp_err_t esp_timer_stop(esp_timer_handle_t timer)
+{
+    return ESP_OK;
+}
+
+esp_err_t esp_timer_start_periodic(esp_timer_handle_t timer, uint64_t period)
+{
+    return ESP_OK;
+}
+
+esp_err_t esp_timer_create(const esp_timer_create_args_t* create_args,
+                           esp_timer_handle_t* out_handle)
+{
+    return ESP_OK;
+}
+
+uint32_t xTaskGetTickCount()
+{
+    struct timeval tv;
+    struct timezone tz;
+    if (gettimeofday(&tv, &tz) == 0) {
+        return (tv.tv_sec * 1000) + (tv.tv_usec / 1000);
+    }
+    return 0;
+}
+
+/// Queue mock
+ QueueHandle_t xQueueCreate( uint32_t uxQueueLength, uint32_t uxItemSize )
+ {
+     g_size = uxItemSize;
+     g_queue = malloc((uxQueueLength)*(uxItemSize));
+     return g_queue;
+ }
+
+
+void vQueueDelete( QueueHandle_t xQueue )
+{
+    free(xQueue);
+}
+
+uint32_t xQueueSend(QueueHandle_t xQueue, const void * pvItemToQueue, TickType_t xTicksToWait)
+{
+    if (g_queue_send_shall_fail)
+    {
+        return pdFALSE;
+    }
+    else
+    {
+        memcpy(xQueue, pvItemToQueue, g_size);
+        return pdPASS;
+    }
+}
+
+
+uint32_t xQueueReceive(QueueHandle_t xQueue, void *pvBuffer, TickType_t xTicksToWait)
+{
+    return pdFALSE;
+}
+
+void GetLastItem(void *pvBuffer)
+{
+    memcpy(pvBuffer, g_queue, g_size);
+}
+
+void ForceTaskDelete()
+{
+    g_queue_send_shall_fail = 1;
+}