Expose post args during upload (esp8266#4935)

Currently post args are only available at the end of upload but they are already listed - this PR just expose them with minimal changes
It also set a define for post args array size originaly set to 32

Author: Luc

libraries/ESP8266WebServer/src/ESP8266WebServer.cpp

@@ -53,6 +53,8 @@ ESP8266WebServer::ESP8266WebServer(IPAddress addr, int port)
 , _lastHandler(nullptr)
 , _currentArgCount(0)
 , _currentArgs(nullptr)
+, _postArgsLen(0)
+, _postArgs(nullptr)
 , _headerKeysCount(0)
 , _currentHeaders(nullptr)
 , _contentLength(0)
@@ -71,6 +73,8 @@ ESP8266WebServer::ESP8266WebServer(int port)
 , _lastHandler(nullptr)
 , _currentArgCount(0)
 , _currentArgs(nullptr)
+, _postArgsLen(0)
+, _postArgs(nullptr)
 , _headerKeysCount(0)
 , _currentHeaders(nullptr)
 , _contentLength(0)
@@ -486,6 +490,10 @@ void ESP8266WebServer::_streamFileCore(const size_t fileSize, const String & fil
 
 
 const String& ESP8266WebServer::arg(String name) const {
+  for (int j = 0; j < _postArgsLen; ++j) {
+    if ( _postArgs[j].key == name )
+      return _postArgs[j].value;
+  }
   for (int i = 0; i < _currentArgCount; ++i) {
     if ( _currentArgs[i].key == name )
       return _currentArgs[i].value;
@@ -510,6 +518,10 @@ int ESP8266WebServer::args() const {
 }
 
 bool ESP8266WebServer::hasArg(const String& name) const {
+  for (int j = 0; j < _postArgsLen; ++j) {
+    if (_postArgs[j].key == name)
+      return true;
+  }
   for (int i = 0; i < _currentArgCount; ++i) {
     if (_currentArgs[i].key == name)
       return true;

libraries/ESP8266WebServer/src/ESP8266WebServer.h

@@ -180,9 +180,12 @@ class ESP8266WebServer
   int              _currentArgCount;
   RequestArgument* _currentArgs;
   std::unique_ptr<HTTPUpload> _currentUpload;
-
+  int              _postArgsLen;
+  RequestArgument* _postArgs;
+    
   int              _headerKeysCount;
   RequestArgument* _currentHeaders;
+ 
   size_t           _contentLength;
   String           _responseHeaders;
 

libraries/ESP8266WebServer/src/Parsing.cpp

@@ -32,6 +32,10 @@
 #define DEBUG_OUTPUT Serial
 #endif
 
+#ifndef WEBSERVER_MAX_POST_ARGS
+#define WEBSERVER_MAX_POST_ARGS 32
+#endif
+
 static const char Content_Type[] PROGMEM = "Content-Type";
 static const char filename[] PROGMEM = "filename";
 
@@ -383,8 +387,9 @@ bool ESP8266WebServer::_parseForm(WiFiClient& client, const String& boundary, ui
   client.readStringUntil('\n');
   //start reading the form
   if (line == ("--"+boundary)){
-    RequestArgument* postArgs = new RequestArgument[32];
-    int postArgsLen = 0;
+    if(_postArgs) delete[] _postArgs;
+    _postArgs = new RequestArgument[WEBSERVER_MAX_POST_ARGS];
+    _postArgsLen = 0;
     while(1){
       String argName;
       String argValue;
@@ -445,7 +450,7 @@ bool ESP8266WebServer::_parseForm(WiFiClient& client, const String& boundary, ui
             DEBUG_OUTPUT.println();
 #endif
 
-            RequestArgument& arg = postArgs[postArgsLen++];
+            RequestArgument& arg = _postArgs[_postArgsLen++];
             arg.key = argName;
             arg.value = argValue;
 
@@ -552,22 +557,25 @@ bool ESP8266WebServer::_parseForm(WiFiClient& client, const String& boundary, ui
     }
 
     int iarg;
-    int totalArgs = ((32 - postArgsLen) < _currentArgCount)?(32 - postArgsLen):_currentArgCount;
+    int totalArgs = ((WEBSERVER_MAX_POST_ARGS - _postArgsLen) < _currentArgCount)?(WEBSERVER_MAX_POST_ARGS - _postArgsLen):_currentArgCount;
     for (iarg = 0; iarg < totalArgs; iarg++){
-      RequestArgument& arg = postArgs[postArgsLen++];
+      RequestArgument& arg = _postArgs[_postArgsLen++];
       arg.key = _currentArgs[iarg].key;
       arg.value = _currentArgs[iarg].value;
     }
     if (_currentArgs) delete[] _currentArgs;
-    _currentArgs = new RequestArgument[postArgsLen];
-    for (iarg = 0; iarg < postArgsLen; iarg++){
+    _currentArgs = new RequestArgument[_postArgsLen];
+    for (iarg = 0; iarg < _postArgsLen; iarg++){
       RequestArgument& arg = _currentArgs[iarg];
-      arg.key = postArgs[iarg].key;
-      arg.value = postArgs[iarg].value;
+      arg.key = _postArgs[iarg].key;
+      arg.value = _postArgs[iarg].value;
     }
     _currentArgCount = iarg;
-    if (postArgs)
-      delete[] postArgs;
+    if (_postArgs) {
+      delete[] _postArgs;
+      _postArgs = nullptr;
+      _postArgsLen = 0;
+    }
     return true;
   }
 #ifdef DEBUG_ESP_HTTP_SERVER