Added arg_P hasArg_P and hasHeader_P

Added arg_P hasArg_P and hasHeader_P to be able to test arg from string
stored in flash

Author: hallard

libraries/ESP8266WebServer/src/ESP8266WebServer.cpp

@@ -378,6 +378,15 @@ String ESP8266WebServer::arg(const char* name) {
   return String();
 }
 
+String ESP8266WebServer::arg_P(PGM_P name) {
+  String argname = name; // Copy to RAM, avoid loop search compare from flash
+  for (int i = 0; i < _currentArgCount; ++i) {
+    if ( _currentArgs[i].key == argname ) 
+      return _currentArgs[i].value;
+  }
+  return String();
+}
+
 String ESP8266WebServer::arg(int i) {
   if (i < _currentArgCount)
     return _currentArgs[i].value;
@@ -402,6 +411,15 @@ bool ESP8266WebServer::hasArg(const char* name) {
   return false;
 }
 
+bool ESP8266WebServer::hasArg_P(PGM_P name) {
+  String argname = name; // Copy to RAM, avoid loop search compare from flash
+  for (int i = 0; i < _currentArgCount; ++i) {
+    if ( _currentArgs[i].key == argname )
+      return true;
+  }
+  return false;
+}
+
 String ESP8266WebServer::header(const char* name) {
   for (int i = 0; i < _headerKeysCount; ++i) {
     if (_currentHeaders[i].key == name)
@@ -445,6 +463,16 @@ bool ESP8266WebServer::hasHeader(const char* name) {
   return false;
 }
 
+bool ESP8266WebServer::hasHeader_P(PGM_P name) {
+  String argname = name; // Copy to RAM, avoid loop search compare from flash
+  for (int i = 0; i < _headerKeysCount; ++i) {
+    if ((_currentHeaders[i].key == argname ) && (_currentHeaders[i].value.length() > 0))
+      return true;
+  }
+  return false;
+}
+
+
 String ESP8266WebServer::hostHeader() {
   return _hostHeader;
 }

libraries/ESP8266WebServer/src/ESP8266WebServer.h

@@ -88,16 +88,19 @@ class ESP8266WebServer
   HTTPUpload& upload() { return _currentUpload; }
 
   String arg(const char* name);   // get request argument value by name
+  String arg_P(PGM_P name);       // get request argument value by name
   String arg(int i);              // get request argument value by number
   String argName(int i);          // get request argument name by number
   int args();                     // get arguments count
   bool hasArg(const char* name);  // check if argument exists
+  bool hasArg_P(PGM_P name);      // check if argument exists
   void collectHeaders(const char* headerKeys[], const size_t headerKeysCount); // set the request headers to collect
   String header(const char* name);   // get request header value by name
   String header(int i);              // get request header value by number
   String headerName(int i);          // get request header name by number
   int headers();                     // get header count
   bool hasHeader(const char* name);  // check if header exists
+  bool hasHeader_P(PGM_P name);      // check if header exists
 
   String hostHeader();            // get request host header if available or empty String if not