Initial revision

From-SVN: r102074

1 files changed, 183 insertions, 0 deletions

diff --git a/libjava/classpath/gnu/java/net/CRLFOutputStream.java b/libjava/classpath/gnu/java/net/CRLFOutputStream.java
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+++ b/libjava/classpath/gnu/java/net/CRLFOutputStream.java
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+/* CRLFOutputStream.java --
+   Copyright (C) 2002, 2003, 2004  Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+ 
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package gnu.java.net;
+
+import java.io.FilterOutputStream;
+import java.io.IOException;
+import java.io.OutputStream;
+import java.io.UnsupportedEncodingException;
+
+/** 
+ * An output stream that filters LFs into CR/LF pairs.
+ *
+ * @author Chris Burdess (dog@gnu.org)
+ */
+public class CRLFOutputStream
+  extends FilterOutputStream
+{
+  static final String US_ASCII = "US-ASCII";
+
+  /**
+   * The CR octet.
+   */
+  public static final int CR = 13;
+
+  /**
+   * The LF octet.
+   */
+  public static final int LF = 10;
+
+  /**
+   * The CR/LF pair.
+   */
+  public static final byte[] CRLF = { CR, LF };
+
+  /**
+   * The last byte read.
+   */
+  protected int last;
+
+  /**
+   * Constructs a CR/LF output stream connected to the specified output stream.
+   */
+  public CRLFOutputStream(OutputStream out)
+  {
+    super(out);
+    last = -1;
+  }
+
+  /**
+   * Writes a character to the underlying stream.
+   * @exception IOException if an I/O error occurred
+   */
+  public void write(int ch) throws IOException
+  {
+    if (ch == CR)
+      {
+        out.write(CRLF);
+      }
+    else if (ch == LF)
+      {
+        if (last != CR)
+          {
+            out.write(CRLF);
+          }
+      }
+    else
+      {
+        out.write(ch);
+      }
+    last = ch;
+  }
+  
+  /**
+   * Writes a byte array to the underlying stream.
+   * @exception IOException if an I/O error occurred
+   */
+  public void write(byte[] b)
+    throws IOException
+  {
+    write(b, 0, b.length);
+  }
+
+  /**
+   * Writes a portion of a byte array to the underlying stream.
+   * @exception IOException if an I/O error occurred
+   */
+  public void write(byte[] b, int off, int len)
+    throws IOException
+  {
+    int d = off;
+    len += off;
+    for (int i = off; i < len; i++)
+      {
+        switch (b[i])
+          {
+          case CR:
+            out.write (b, d, i - d);
+            out.write (CRLF, 0, 2);
+            d = i + 1;
+            break;
+          case LF:
+            if (last != CR)
+              {
+                out.write (b, d, i - d);
+                out.write (CRLF, 0, 2);
+              }
+            d = i + 1;
+            break;
+          }
+        last = b[i];
+      }
+    if (len - d > 0)
+      {
+        out.write (b, d, len - d);
+      }
+  }
+  
+  /**
+   * Writes the specified ASCII string to the underlying stream.
+   * @exception IOException if an I/O error occurred
+   */
+  public void write(String text)
+    throws IOException
+  {
+    try
+      {
+        byte[] bytes = text.getBytes(US_ASCII);
+        write(bytes, 0, bytes.length);
+        }
+    catch (UnsupportedEncodingException e)
+      {
+        throw new IOException("The US-ASCII encoding is not supported " +
+                              "on this system");
+      }
+  }
+
+  /**
+   * Writes a newline to the underlying stream.
+   * @exception IOException if an I/O error occurred
+   */
+  public void writeln()
+    throws IOException
+  {
+    out.write(CRLF, 0, 2);
+  }
+}
+