| /* |
| * Copyright (c) 2014, 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. |
| * |
| * 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 util; |
| |
| import java.io.BufferedInputStream; |
| import java.io.ByteArrayInputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.InputStreamReader; |
| import java.io.UnsupportedEncodingException; |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| public class BOMInputStream { |
| public static InputStream createStream(String charset, InputStream input) { |
| |
| try { |
| byte[] content = read(input).getBytes(charset); |
| byte[] head = bom.get(charset); |
| if (head == null) |
| return null; |
| byte[] result = new byte[head.length + content.length]; |
| System.arraycopy(head, 0, result, 0, head.length); |
| System.arraycopy(content, 0, result, head.length, content.length); |
| return new ByteArrayInputStream(result); |
| } catch (UnsupportedEncodingException e) { |
| return null; |
| } |
| } |
| |
| private static String read(InputStream input) |
| { |
| try { |
| StringBuffer sb = new StringBuffer(); |
| InputStreamReader r = new InputStreamReader(new BufferedInputStream(input)); |
| int c = 0; |
| while ((c = r.read()) != -1) |
| sb.append((char)c); |
| return sb.toString(); |
| } catch (IOException e) { |
| return ""; |
| } finally { |
| try { |
| input.close(); |
| } catch (IOException e) |
| {} |
| } |
| } |
| |
| |
| private final static Map<String, byte[]> bom = new HashMap(); |
| private final static byte[][] bomBytes = {{(byte)0xEF, (byte)0xBB, (byte)0xBF}, |
| {(byte)0xFE, (byte)0xFF}}; |
| |
| static { |
| bom.put("UTF-8", bomBytes[0]); |
| bom.put("UTF-16BE", bomBytes[1]); |
| } |
| |
| } |