128 lines
2.6 KiB
Java
128 lines
2.6 KiB
Java
/*
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* CRLFOutputStream.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 filters LFs into CR/LF pairs.
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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 CRLFOutputStream extends FilterOutputStream {
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/**
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* The CR octet.
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*/
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public static final int CR = 13;
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/**
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* The LF octet.
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*/
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public static final int LF = 10;
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/**
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* The CR/LF pair.
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*/
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public static final byte[] CRLF = { CR, LF };
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/**
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* The last byte read.
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*/
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protected int last;
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/**
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* Constructs a CR/LF output stream connected to the specified output stream.
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*/
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public CRLFOutputStream(OutputStream out) {
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super(out);
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last = -1;
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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 (ch==CR)
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out.write(CRLF);
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else
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if (ch==LF) {
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if (last!=CR)
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out.write(CRLF);
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} else {
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out.write(ch);
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}
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last = ch;
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}
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/**
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* Writes 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[]) throws IOException {
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write(b, 0, b.length);
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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 d = off;
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len += off;
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for (int i=off; i<len; i++)
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switch (b[i]) {
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default:
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break;
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case CR:
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if (i+1<len && b[i+1]==LF) {
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i++;
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} else {
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out.write(b, d, (i-d)+1);
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out.write(LF);
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d = i+1;
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}
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break;
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case LF:
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out.write(b, d, i-d);
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out.write(CRLF, 0, 2);
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d = i+1;
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break;
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}
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if (len-d>0)
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out.write(b, d, len-d);
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}
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/**
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* Writes a newline 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 writeln() throws IOException {
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out.write(CRLF);
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}
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}
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