setMD5 has now returns bool

handle setMD5 failed in HTTP update
reset UpdaterClass when MD5 check failed
see: #1244

Author: Links2004

cores/esp8266/Updater.cpp

@@ -124,9 +124,13 @@ bool UpdaterClass::begin(size_t size, int command) {
   return true;
 }
 
-void UpdaterClass::setMD5(const char * expected_md5){
-  if(strlen(expected_md5) != 32) return;
+bool UpdaterClass::setMD5(const char * expected_md5){
+  if(strlen(expected_md5) != 32)
+  {
+    return false;
+  }
   _target_md5 = expected_md5;
+  return true;
 }
 
 bool UpdaterClass::end(bool evenIfRemaining){
@@ -160,6 +164,7 @@ bool UpdaterClass::end(bool evenIfRemaining){
 #ifdef DEBUG_UPDATER
       DEBUG_UPDATER.printf("MD5 Failed: expected:%s, calculated:%s\n", _target_md5.c_str(), _md5.toString().c_str());
 #endif
+      _reset();
       return false;
     }
 #ifdef DEBUG_UPDATER

cores/esp8266/Updater.h

@@ -65,7 +65,7 @@ class UpdaterClass {
     /*
       sets the expected MD5 for the firmware (hexString)
     */
-    void setMD5(const char * expected_md5);
+    bool setMD5(const char * expected_md5);
 
     /*
       returns the MD5 String of the sucessfully ended firmware

libraries/ESP8266httpUpdate/src/ESP8266httpUpdate.cpp

@@ -296,7 +296,11 @@ bool ESP8266HTTPUpdate::runUpdate(Stream& in, uint32_t size, String md5, int com
     }
 
     if(md5.length()) {
-        Update.setMD5(md5.c_str());
+        if(!Update.setMD5(md5.c_str())) {
+            lastError = HTTP_UE_SERVER_FAULTY_MD5;
+            DEBUG_HTTP_UPDATE("[httpUpdate] Update.setMD5 failed! (%s)\n", md5.c_str());
+            return false;
+        }
     }
 
     if(Update.writeStream(in) != size) {

libraries/ESP8266httpUpdate/src/ESP8266httpUpdate.h

@@ -44,6 +44,7 @@
 #define HTTP_UE_SERVER_FILE_NOT_FOUND   (-102)
 #define HTTP_UE_SERVER_FORBIDDEN        (-103)
 #define HTTP_UE_SERVER_WRONG_HTTP_CODE  (-104)
+#define HTTP_UE_SERVER_FAULTY_MD5       (-105)
 
 typedef enum {
     HTTP_UPDATE_FAILED,