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  1. /*
  2.  * Copyright 1997-2007 Sun Microsystems, Inc. All Rights Reserved.
  3.  *
  4.  * Redistribution and use in source and binary forms, with or without
  5.  * modification, are permitted provided that the following conditions
  6.  * are met:
  7.  *
  8.  *   - Redistributions of source code must retain the above copyright
  9.  *     notice, this list of conditions and the following disclaimer.
  10.  *
  11.  *   - Redistributions in binary form must reproduce the above copyright
  12.  *     notice, this list of conditions and the following disclaimer in the
  13.  *     documentation and/or other materials provided with the distribution.
  14.  *
  15.  *   - Neither the name of Sun Microsystems nor the names of its
  16.  *     contributors may be used to endorse or promote products derived
  17.  *     from this software without specific prior written permission.
  18.  *
  19.  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
  20.  * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  21.  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22.  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
  23.  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  24.  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  25.  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  26.  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  27.  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  28.  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  29.  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  30.  */
  31.  
  32. import java.io.*;
  33.  
  34. /**
  35.  * Convert lines into the canonical MIME format, that is,
  36.  * terminate lines with CRLF. <p>
  37.  *
  38.  * This stream can be used with the Part.writeTo and Message.writeTo
  39.  * methods to generate the canonical MIME format of the data for the
  40.  * purpose of (e.g.) sending it via SMTP or computing a digital
  41.  * signature.
  42.  */
  43. public class CRLFOutputStream extends FilterOutputStream {
  44.     protected int lastb = -1;
  45.     protected static byte[] newline;
  46.     static {
  47.         newline = new byte[2];
  48.         newline[0] = (byte)'\r';
  49.         newline[1] = (byte)'\n';
  50.     }
  51.  
  52.     public CRLFOutputStream(OutputStream os) {
  53.         super(os);
  54.     }
  55.  
  56.     public void write(int b) throws IOException {
  57.         if (b == '\r') {
  58.             out.write(newline);
  59.         } else if (b == '\n') {
  60.             if (lastb != '\r')
  61.                 out.write(newline);
  62.         } else {
  63.             out.write(b);
  64.         }
  65.         lastb = b;
  66.     }
  67.  
  68.     public void write(byte b[]) throws IOException {
  69.         write(b, 0, b.length);
  70.     }
  71.  
  72.     public void write(byte b[], int off, int len) throws IOException {
  73.         int start = off;
  74.  
  75.         len += off;
  76.         for (int i = start; i < len ; i++) {
  77.             if (b[i] == '\r') {
  78.                 out.write(b, start, i - start);
  79.                 out.write(newline);
  80.                 start = i + 1;
  81.             } else if (b[i] == '\n') {
  82.                 if (lastb != '\r') {
  83.                     out.write(b, start, i - start);
  84.                     out.write(newline);
  85.                 }
  86.                 start = i + 1;
  87.             }
  88.             lastb = b[i];
  89.         }
  90.         if ((len - start) > 0)
  91.             out.write(b, start, len - start);
  92.     }
  93. }
  94.