Implemented streamFile()

Author: jackjansen

src/ESPWebServer.cpp

@@ -222,6 +222,13 @@ String ESPWebServer::hostHeader() {
   return header("Host");
 }
 
+void ESPWebServer::_prepareStreamFile(size_t fileSize, const String& contentType) {
+  _contentLength = fileSize;
+  _activeResponse->setStatusCode(200);
+  _activeResponse->setHeader("Content-Type", contentType.c_str());
+  _standardHeaders();
+}
+
 void ESPWebServer::send(int code, const char* content_type, const String& content) {
   _contentLength = content.length();
   _activeResponse->setStatusCode(code);

src/ESPWebServer.hpp

@@ -107,7 +107,20 @@ class ESPWebServer
 
   static String urlDecode(const String& text);
 
-  //template<typename T> size_t streamFile(T &file, const String& contentType);
+  template<typename T> size_t streamFile(T &file, const String& contentType) {
+    size_t fileSize = file.size();
+    uint8_t buffer[HTTP_UPLOAD_BUFLEN];
+    _prepareStreamFile(fileSize, contentType);
+    size_t didWrite = 0;
+    while (fileSize > 0) {
+      size_t thisRead = file.read(buffer, fileSize > HTTP_UPLOAD_BUFLEN ? HTTP_UPLOAD_BUFLEN : fileSize);
+      if (thisRead == 0) break;
+      _activeResponse->write(buffer, thisRead);
+      didWrite += thisRead;
+      fileSize -= thisRead;
+    }
+    return didWrite;
+  }
 
 protected:
   friend class ESPWebServerNode;
@@ -118,6 +131,9 @@ class ESPWebServer
   /** Add standard headers */
   void _standardHeaders();
 
+  /** Prepare for streaming a file */
+  void _prepareStreamFile(size_t fileSize, const String& contentType);
+
   /** The backing server instance */
   httpsserver::HTTPServer _server;