improve download code

src/download.cpp

@@ -9,13 +9,23 @@ bool downloadFile(String url, const char *path)
 	// @note duration time: 200kb = 35sec write to flash
 	Serial.println("Download file: " + url);
 
+	// tmp file
 	bool hasError = false;
 	String tmpFile = path;
 	tmpFile += ".tmp";
 
+	// track duration
+	long startMills = millis();
+
+	File file = SPIFFS.open(tmpFile, FILE_WRITE);
+	if (!file)
+	{
+		Serial.println("Failed to open file for writing");
+		return false;
+	}
+
 	http.useHTTP10(true); // http1.1 chunked übertragung funktioniert irgendwie nicht
 	http.setTimeout(7000);
-
 	http.begin(url);
 	int httpCode = http.GET();
 	if (httpCode != HTTP_CODE_OK)
@@ -25,53 +35,8 @@ bool downloadFile(String url, const char *path)
 	}
 	else
 	{
-		// track duration
-		long startMills = millis();
-
-		// get lenght of document (is -1 when Server sends no Content-Length header)
-		int len = http.getSize();
-
-		// create buffer for read
-		uint8_t buff[1024] = {0};
-
-		// get tcp stream
-		WiFiClient *stream = http.getStreamPtr();
-
-		// persist image
-		File file = SPIFFS.open(tmpFile, FILE_WRITE);
-		if (!file)
-		{
-			Serial.println("Failed to open file for writing");
-			hasError = true;
-		}
-
-		// read all data from server
-		while (http.connected() && (len > 0 || len == -1))
-		{
-			// get available data size
-			size_t size = stream->available();
-
-			if (size)
-			{
-				// read up to xxx byte
-				int c = stream->readBytes(buff, ((size > sizeof(buff)) ? sizeof(buff) : size));
-
-				// write to storage
-				if (file)
-				{
-					file.write(buff, c);
-				}
-
-				if (len > 0)
-				{
-					len -= c;
-				}
-			}
-
-			delay(1);
-		}
+		http.writeToStream(&file);
 
-		// done
 		if (file)
 		{
 			file.close();