WiFiClient: fix progmem reads

Author: igrr

libraries/ESP8266WebServer/src/ESP8266WebServer.cpp

@@ -241,6 +241,9 @@ void ESP8266WebServer::sendHeader(const String& name, const String& value, bool
   }
 }
 
+void ESP8266WebServer::setContentLength(size_t contentLength) {
+    _contentLength = contentLength;
+}
 
 void ESP8266WebServer::_prepareHeader(String& response, int code, const char* content_type, size_t contentLength) {
     response = "HTTP/1.1 ";

libraries/ESP8266WebServer/src/ESP8266WebServer.h

@@ -112,7 +112,7 @@ class ESP8266WebServer
   void send_P(int code, PGM_P content_type, PGM_P content);
   void send_P(int code, PGM_P content_type, PGM_P content, size_t contentLength);
 
-  void setContentLength(size_t contentLength) { _contentLength = contentLength; }
+  void setContentLength(size_t contentLength);
   void sendHeader(const String& name, const String& value, bool first = false);
   void sendContent(const String& content);
   void sendContent_P(PGM_P content);

libraries/ESP8266WiFi/src/include/DataStrategyImpl.h

@@ -136,6 +136,8 @@ class ProgmemSource
     {
         size_t will_read = (_left < size) ? _left : size;
         memcpy_P((void*)dst, (PGM_VOID_P)_buf, will_read);
+        _left -= will_read;
+        _buf  += will_read;
         return will_read;
     }