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/*
* @(#)CRLFOutputStream.java 1.3 01/05/23
*
* Copyright 1997-2000 Sun Microsystems, Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistribution in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* Neither the name of Sun Microsystems, Inc. or the names of contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* This software is provided "AS IS," without a warranty of any kind. ALL
* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
* INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN AND
* ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES OR LIABILITIES
* SUFFERED BY LICENSEE AS A RESULT OF OR RELATING TO USE, MODIFICATION
* OR DISTRIBUTION OF THE SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL
* SUN OR ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR
* FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
* DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
* ARISING OUT OF THE USE OF OR INABILITY TO USE SOFTWARE, EVEN IF SUN HAS
* BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
*
* You acknowledge that Software is not designed, licensed or intended
* for use in the design, construction, operation or maintenance of any
* nuclear facility.
*/
import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;
/**
* Convert lines into the canonical MIME format, that is, terminate lines with
* CRLF.
* <p>
*
* This stream can be used with the Part.writeTo and Message.writeTo methods to
* generate the canonical MIME format of the data for the purpose of (e.g.)
* sending it via SMTP or computing a digital signature.
*/
public class CRLFOutputStream extends FilterOutputStream {
protected int lastb = -1;
protected static byte[] newline;
static {
newline = new byte[2];
newline[0] = (byte) '\r';
newline[1] = (byte) '\n';
}
public CRLFOutputStream(OutputStream os) {
super(os);
}
public void write(int b) throws IOException {
if (b == '\r') {
out.write(newline);
} else if (b == '\n') {
if (lastb != '\r')
out.write(newline);
} else {
out.write(b);
}
lastb = b;
}
public void write(byte b[]) throws IOException {
write(b, 0, b.length);
}
public void write(byte b[], int off, int len) throws IOException {
int start = off;
len += off;
for (int i = start; i < len; i++) {
if (b[i] == '\r') {
out.write(b, start, i - start);
out.write(newline);
start = i + 1;
} else if (b[i] == '\n') {
if (lastb != '\r') {
out.write(b, start, i - start);
out.write(newline);
}
start = i + 1;
}
lastb = b[i];
}
if ((len - start) > 0)
out.write(b, start, len - start);
}
}
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