| 1 | /**************************************************************** |
| 2 | * Licensed to the Apache Software Foundation (ASF) under one * |
| 3 | * or more contributor license agreements. See the NOTICE file * |
| 4 | * distributed with this work for additional information * |
| 5 | * regarding copyright ownership. The ASF licenses this file * |
| 6 | * to you under the Apache License, Version 2.0 (the * |
| 7 | * "License"); you may not use this file except in compliance * |
| 8 | * with the License. You may obtain a copy of the License at * |
| 9 | * * |
| 10 | * http://www.apache.org/licenses/LICENSE-2.0 * |
| 11 | * * |
| 12 | * Unless required by applicable law or agreed to in writing, * |
| 13 | * software distributed under the License is distributed on an * |
| 14 | * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * |
| 15 | * KIND, either express or implied. See the License for the * |
| 16 | * specific language governing permissions and limitations * |
| 17 | * under the License. * |
| 18 | ****************************************************************/ |
| 19 | |
| 20 | package org.apache.james.jdkim.mailets; |
| 21 | |
| 22 | import java.io.FilterOutputStream; |
| 23 | import java.io.IOException; |
| 24 | import java.io.OutputStream; |
| 25 | |
| 26 | /** |
| 27 | * Ignore writes until the given sequence is found. |
| 28 | */ |
| 29 | public class HeaderSkippingOutputStream extends FilterOutputStream { |
| 30 | |
| 31 | boolean inHeaders = true; |
| 32 | byte[] skipTo = "\r\n\r\n".getBytes(); |
| 33 | int pos = 0; |
| 34 | |
| 35 | public HeaderSkippingOutputStream(OutputStream out) { |
| 36 | super(out); |
| 37 | } |
| 38 | |
| 39 | public void write(byte[] b, int off, int len) throws IOException { |
| 40 | if (inHeaders) { |
| 41 | for (int i = off; i < off + len; i++) { |
| 42 | if (b[i] == skipTo[pos]) { |
| 43 | pos++; |
| 44 | if (pos == skipTo.length) { |
| 45 | inHeaders = false; |
| 46 | if (len - i - 1 > 0) |
| 47 | out.write(b, i + 1, len - i - 1); |
| 48 | break; |
| 49 | } |
| 50 | } else |
| 51 | pos = 0; |
| 52 | } |
| 53 | } else { |
| 54 | out.write(b, off, len); |
| 55 | } |
| 56 | } |
| 57 | |
| 58 | public void write(int b) throws IOException { |
| 59 | if (inHeaders) { |
| 60 | if (skipTo[pos] == b) { |
| 61 | pos++; |
| 62 | if (pos == skipTo.length) |
| 63 | inHeaders = false; |
| 64 | } else |
| 65 | pos = 0; |
| 66 | } else { |
| 67 | out.write(b); |
| 68 | } |
| 69 | } |
| 70 | |
| 71 | } |