88 lines
2.1 KiB
Java
88 lines
2.1 KiB
Java
/*
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* MessageOutputStream.java
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*
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* The contents of this file are subject to the Mozilla Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is Knife.
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*
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* The Initial Developer of the Original Code is dog.
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* Portions created by dog are
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* Copyright (C) 1998 dog <dog@dog.net.uk>. All
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* Rights Reserved.
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*
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* Contributor(s): n/a.
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*/
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package dog.mail.util;
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import java.io.*;
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/**
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* An output stream that escapes any dots on a line by themself with
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* another dot, for the purposes of sending messages to SMTP and NNTP servers.
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*
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* @author dog@dog.net.uk
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* @version 0.1
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*/
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public class MessageOutputStream extends FilterOutputStream {
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/**
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* The stream termination octet.
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*/
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public static final int END = 46;
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/**
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* The line termination octet.
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*/
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public static final int LF = 10;
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int last = -1; // the last character written to the stream
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/**
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* Constructs a message output stream connected to the specified output stream.
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* @param out the target output stream
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*/
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public MessageOutputStream(OutputStream out) {
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super(out);
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}
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/**
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* Writes a character to the underlying stream.
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* @exception IOException if an I/O error occurred
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*/
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public void write(int ch) throws IOException {
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if ((last==LF || last==-1) && ch==END)
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out.write(END); // double any lonesome dots
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super.write(ch);
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}
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/**
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* Writes a portion of a byte array to the underlying stream.
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* @exception IOException if an I/O error occurred
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*/
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public void write(byte b[], int off, int len) throws IOException {
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int k = last != -1 ? last : LF;
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int l = off;
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len += off;
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for (int i = off; i < len; i++) {
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if (k==LF && b[i]==END) {
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super.write(b, l, i-l);
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out.write(END);
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l = i;
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}
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k = b[i];
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}
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if (len-l > 0)
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super.write(b, l, len-l);
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}
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}
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