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+/* OutputBuffer.java --
+ Copyright (C) 2003, 2006 Free Software Foundation, Inc.
+
+This file is a 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 of the License, 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; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, 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.javax.crypto.sasl;
+
+import gnu.java.security.Registry;
+import gnu.java.security.util.Util;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.math.BigInteger;
+
+/**
+ * The implementation of an outgoing SASL buffer.
+ * <p>
+ * The data elements this class caters for are described in [1].
+ * <p>
+ * References:
+ * <ol>
+ * <li><a
+ * href="http://www.ietf.org/internet-drafts/draft-burdis-cat-srp-sasl-09.txt">
+ * Secure Remote Password Authentication Mechanism</a>;<br/>
+ * draft-burdis-cat-srp-sasl-09,<br/> <a
+ * href="mailto:keith@rucus.ru.ac.za">Keith Burdis</a> and <a
+ * href="mailto:raif@forge.com.au">Ra&iuml;f S. Naffah</a>.</li>
+ * </ol>
+ */
+public class OutputBuffer
+{
+ /** The internal output stream. */
+ private ByteArrayOutputStream out;
+
+ public OutputBuffer()
+ {
+ super();
+
+ out = new ByteArrayOutputStream();
+ }
+
+ /**
+ * Encodes a SASL scalar quantity, <code>count</code>-octet long, to the
+ * current buffer.
+ *
+ * @param count number of octets to encode <code>b</code> with.
+ * @param b the scalar quantity.
+ * @throws SaslEncodingException if an encoding size constraint is violated.
+ * @throws IOException if any other I/O exception occurs during the operation.
+ */
+ public void setScalar(int count, int b) throws IOException
+ {
+ if (count < 0 || count > 4)
+ throw new SaslEncodingException("Invalid SASL scalar octet count: "
+ + String.valueOf(count));
+ byte[] element = new byte[count];
+ for (int i = count; --i >= 0; b >>>= 8)
+ element[i] = (byte) b;
+ out.write(element);
+ }
+
+ /**
+ * Encodes a SASL OS to the current buffer.
+ *
+ * @param b the OS element.
+ * @throws SaslEncodingException if an encoding size constraint is violated.
+ * @throws IOException if any other I/O exception occurs during the operation.
+ */
+ public void setOS(byte[] b) throws IOException
+ {
+ final int length = b.length;
+ if (length > Registry.SASL_ONE_BYTE_MAX_LIMIT)
+ throw new SaslEncodingException("SASL octet-sequence too long");
+ out.write(length & 0xFF);
+ out.write(b);
+ }
+
+ /**
+ * Encodes a SASL EOS to the current buffer.
+ *
+ * @param b the EOS element.
+ * @throws SaslEncodingException if an encoding size constraint is violated.
+ * @throws IOException if any other I/O exception occurs during the operation.
+ */
+ public void setEOS(byte[] b) throws IOException
+ {
+ final int length = b.length;
+ if (length > Registry.SASL_TWO_BYTE_MAX_LIMIT)
+ throw new SaslEncodingException("SASL extended octet-sequence too long");
+ byte[] lengthBytes = { (byte)(length >>> 8), (byte) length };
+ out.write(lengthBytes);
+ out.write(b);
+ }
+
+ /**
+ * Encodes a SASL MPI to the current buffer.
+ *
+ * @param val the MPI element.
+ * @throws SaslEncodingException if an encoding size constraint is violated.
+ * @throws IOException if any other I/O exception occurs during the operation.
+ */
+ public void setMPI(BigInteger val) throws IOException
+ {
+ byte[] b = Util.trim(val);
+ final int length = b.length;
+ if (length > Registry.SASL_TWO_BYTE_MAX_LIMIT)
+ throw new SaslEncodingException("SASL multi-precision integer too long");
+ byte[] lengthBytes = { (byte)(length >>> 8), (byte) length };
+ out.write(lengthBytes);
+ out.write(b);
+ }
+
+ /**
+ * Encodes a SASL Text to the current buffer.
+ *
+ * @param str the Text element.
+ * @throws SaslEncodingException if an encoding size constraint is violated.
+ * @throws SaslEncodingException if the UTF-8 encoding is not supported on
+ * this platform.
+ * @throws IOException if any other I/O exception occurs during the operation.
+ */
+ public void setText(String str) throws IOException
+ {
+ byte[] b = str.getBytes("UTF8");
+ final int length = b.length;
+ if (length > Registry.SASL_TWO_BYTE_MAX_LIMIT)
+ throw new SaslEncodingException("SASL text too long");
+ byte[] lengthBytes = { (byte)(length >>> 8), (byte) length };
+ out.write(lengthBytes);
+ out.write(b);
+ }
+
+ /**
+ * Returns the encoded form of the current buffer including the 4-byte length
+ * header.
+ *
+ * @throws SaslEncodingException if an encoding size constraint is violated.
+ */
+ public byte[] encode() throws SaslEncodingException
+ {
+ byte[] buffer = wrap();
+ final int length = buffer.length;
+ byte[] result = new byte[length + 4];
+ result[0] = (byte)(length >>> 24);
+ result[1] = (byte)(length >>> 16);
+ result[2] = (byte)(length >>> 8);
+ result[3] = (byte) length;
+ System.arraycopy(buffer, 0, result, 4, length);
+ return result;
+ }
+
+ /**
+ * Returns the encoded form of the current buffer excluding the 4-byte length
+ * header.
+ *
+ * @throws SaslEncodingException if an encoding size constraint is violated.
+ */
+ public byte[] wrap() throws SaslEncodingException
+ {
+ final int length = out.size();
+ if (length > Registry.SASL_BUFFER_MAX_LIMIT || length < 0)
+ throw new SaslEncodingException("SASL buffer too long");
+ return out.toByteArray();
+ }
+}