--- /dev/null	2018-06-17 23:18:20.806999507 +0800
+++ new/src/share/classes/jdk/jfr/internal/jfc/JFCParser.java	2019-01-29 11:00:14.335540114 +0800
@@ -0,0 +1,85 @@
+/*
+ * Copyright (c) 2012, 2019, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package jdk.jfr.internal.jfc;
+
+import java.io.CharArrayReader;
+import java.io.CharArrayWriter;
+import java.io.IOException;
+import java.io.Reader;
+import java.text.ParseException;
+import jdk.internal.org.xml.sax.InputSource;
+import jdk.internal.org.xml.sax.SAXException;
+import jdk.internal.util.xml.SAXParser;
+import jdk.internal.util.xml.impl.SAXParserImpl;
+import jdk.jfr.Configuration;
+
+import jdk.jfr.internal.PrivateAccess;
+
+/**
+ * Parses a JDK Flight Recorder Configuration file (.jfc)
+ */
+final class JFCParser {
+    static final String FILE_EXTENSION = ".jfc";
+    private static final int MAXIMUM_FILE_SIZE = 1024 * 1024;
+
+    public static Configuration createConfiguration(String name, Reader reader) throws IOException, ParseException {
+        return createConfiguration(name, readContent(reader));
+    }
+
+    public static Configuration createConfiguration(String name, String content) throws IOException, ParseException {
+        try {
+            JFCParserHandler ch = new JFCParserHandler();
+            parseXML(content, ch);
+            return PrivateAccess.getInstance().newConfiguration(name, ch.label, ch.description, ch.provider, ch.settings, content);
+        } catch (IllegalArgumentException iae) {
+            throw new ParseException(iae.getMessage(), -1);
+        } catch (SAXException e) {
+            ParseException pe =  new ParseException("Error reading JFC file. " + e.getMessage(), -1);
+            pe.initCause(e);
+            throw pe;
+        }
+    }
+
+    private static void parseXML(String content, JFCParserHandler ch) throws SAXException, IOException {
+        CharArrayReader r = new CharArrayReader(content.toCharArray());
+        SAXParser parser = new SAXParserImpl();
+        parser.parse(new InputSource(r), ch);
+    }
+
+    private static String readContent(Reader r) throws IOException {
+        CharArrayWriter writer = new CharArrayWriter(1024);
+        int count = 0;
+        int ch;
+        while ((ch = r.read()) != -1) {
+            writer.write(ch);
+            count++;
+            if (count >= MAXIMUM_FILE_SIZE) {
+                throw new IOException("Presets with more than " + MAXIMUM_FILE_SIZE + " characters can't be read.");
+            }
+        }
+        return new String(writer.toCharArray());
+    }
+}