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1: /* 2: * MessageOutputStream.java 3: * Copyright (C) 2002 The Free Software Foundation 4: * 5: * This file is part of GNU inetlib, a library. 6: * 7: * GNU inetlib is free software; you can redistribute it and/or modify 8: * it under the terms of the GNU General Public License as published by 9: * the Free Software Foundation; either version 2 of the License, or 10: * (at your option) any later version. 11: * 12: * GNU inetlib is distributed in the hope that it will be useful, 13: * but WITHOUT ANY WARRANTY; without even the implied warranty of 14: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15: * GNU General Public License for more details. 16: * 17: * You should have received a copy of the GNU General Public License 18: * along with this library; if not, write to the Free Software 19: * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 20: * 21: * Linking this library statically or dynamically with other modules is 22: * making a combined work based on this library. Thus, the terms and 23: * conditions of the GNU General Public License cover the whole 24: * combination. 25: * 26: * As a special exception, the copyright holders of this library give you 27: * permission to link this library with independent modules to produce an 28: * executable, regardless of the license terms of these independent 29: * modules, and to copy and distribute the resulting executable under 30: * terms of your choice, provided that you also meet, for each linked 31: * independent module, the terms and conditions of the license of that 32: * module. An independent module is a module which is not derived from 33: * or based on this library. If you modify this library, you may extend 34: * this exception to your version of the library, but you are not 35: * obliged to do so. If you do not wish to do so, delete this 36: * exception statement from your version. 37: */ 38: 39: package gnu.inet.util; 40: 41: import java.io.FilterOutputStream; 42: import java.io.IOException; 43: import java.io.OutputStream; 44: 45: /** 46: * An output stream that escapes any dots on a line by themself with 47: * another dot, for the purposes of sending messages to SMTP and NNTP 48: * servers. 49: * 50: * @author <a href="mailto:dog@gnu.org">Chris Burdess</a> 51: */ 52: public class MessageOutputStream 53: extends FilterOutputStream 54: { 55: 56: /** 57: * The stream termination octet. 58: */ 59: public static final int END = 46; 60: 61: /** 62: * The line termination octet. 63: */ 64: public static final int LF = 10; 65: 66: int[] last = { LF, LF }; // the last character written to the stream 67: 68: /** 69: * Constructs a message output stream connected to the specified output 70: * stream. 71: * @param out the target output stream 72: */ 73: public MessageOutputStream(OutputStream out) 74: { 75: super(out); 76: } 77: 78: /** 79: * Character write. 80: */ 81: public void write(int c) 82: throws IOException 83: { 84: if (last[0] == LF && last[1] == END && c == LF) 85: { 86: out.write (END); 87: } 88: out.write(c); 89: last[0] = last[1]; 90: last[1] = c; 91: } 92: 93: public void write(byte[] bytes) 94: throws IOException 95: { 96: write(bytes, 0, bytes.length); 97: } 98: 99: /** 100: * Block write. 101: */ 102: public void write(byte[] bytes, int off, int len) 103: throws IOException 104: { 105: for (int i = 0; i < len; i++) 106: { 107: int c = (int) bytes[off + i]; 108: if (last[0] == LF && last[1] == END && c == LF) 109: { 110: byte[] b2 = new byte[bytes.length + 1]; 111: System.arraycopy(bytes, off, b2, off, i); 112: b2[off + i] = END; 113: System.arraycopy(bytes, off + i, b2, off + i + 1, len - i); 114: bytes = b2; 115: i++; 116: len++; 117: } 118: last[0] = last[1]; 119: last[1] = c; 120: } 121: out.write(bytes, off, len); 122: } 123: 124: }