CRLFOutputStream.java Source code

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Here is the source code for CRLFOutputStream.java

Source

/*
 * @(#)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);
    }
}