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Change-Id: I49ce97136c17173c4ae3965c694af6e7bc49897d

1 files changed, 208 insertions, 0 deletions

diff --git a/src/com/novell/sasl/client/TokenParser.java b/src/com/novell/sasl/client/TokenParser.java
new file mode 100644
index 0000000..3d3491d
--- /dev/null
+++ b/src/com/novell/sasl/client/TokenParser.java
@@ -0,0 +1,208 @@
+/* **************************************************************************
+ * $OpenLDAP: /com/novell/sasl/client/TokenParser.java,v 1.3 2005/01/17 15:00:54 sunilk Exp $
+ *
+ * Copyright (C) 2002 Novell, Inc. All Rights Reserved.
+ *
+ * THIS WORK IS SUBJECT TO U.S. AND INTERNATIONAL COPYRIGHT LAWS AND
+ * TREATIES. USE, MODIFICATION, AND REDISTRIBUTION OF THIS WORK IS SUBJECT
+ * TO VERSION 2.0.1 OF THE OPENLDAP PUBLIC LICENSE, A COPY OF WHICH IS
+ * AVAILABLE AT HTTP://WWW.OPENLDAP.ORG/LICENSE.HTML OR IN THE FILE "LICENSE"
+ * IN THE TOP-LEVEL DIRECTORY OF THE DISTRIBUTION. ANY USE OR EXPLOITATION
+ * OF THIS WORK OTHER THAN AS AUTHORIZED IN VERSION 2.0.1 OF THE OPENLDAP
+ * PUBLIC LICENSE, OR OTHER PRIOR WRITTEN CONSENT FROM NOVELL, COULD SUBJECT
+ * THE PERPETRATOR TO CRIMINAL AND CIVIL LIABILITY.
+ ******************************************************************************/
+package com.novell.sasl.client;
+
+import org.apache.harmony.javax.security.sasl.*;
+/**
+ * The TokenParser class will parse individual tokens from a list of tokens that
+ * are a directive value for a DigestMD5 authentication.The tokens are separated
+ * commas.
+ */
+class TokenParser extends Object
+{
+    private static final int STATE_LOOKING_FOR_FIRST_TOKEN = 1;
+    private static final int STATE_LOOKING_FOR_TOKEN       = 2;
+    private static final int STATE_SCANNING_TOKEN          = 3;
+    private static final int STATE_LOOKING_FOR_COMMA       = 4;
+    private static final int STATE_PARSING_ERROR           = 5;
+    private static final int STATE_DONE                    = 6;
+
+    private int        m_curPos;
+    private int     m_scanStart;
+    private int     m_state;
+    private String  m_tokens;
+
+
+    TokenParser(
+        String tokens)
+    {
+        m_tokens = tokens;
+        m_curPos = 0;
+        m_scanStart = 0;
+        m_state =  STATE_LOOKING_FOR_FIRST_TOKEN;
+    }
+
+    /**
+     * This function parses the next token from the tokens string and returns
+     * it as a string. If there are no more tokens a null reference is returned.
+     *
+     * @return  the parsed token or a null reference if there are no more
+     * tokens
+     *
+     * @exception  SASLException if an error occurs while parsing
+     */
+    String parseToken() throws SaslException
+    {
+        char    currChar;
+        String  token = null;
+
+
+        if (m_state == STATE_DONE)
+            return null;
+
+        while (m_curPos < m_tokens.length() && (token == null))
+        {
+            currChar = m_tokens.charAt(m_curPos);
+            switch (m_state)
+            {
+            case STATE_LOOKING_FOR_FIRST_TOKEN:
+            case STATE_LOOKING_FOR_TOKEN:
+                if (isWhiteSpace(currChar))
+                {
+                    break;
+                }
+                else if (isValidTokenChar(currChar))
+                {
+                    m_scanStart = m_curPos;
+                    m_state = STATE_SCANNING_TOKEN;
+                }
+                else
+                {
+                    m_state = STATE_PARSING_ERROR;
+                    throw new SaslException("Invalid token character at position " + m_curPos);
+                }
+                break;
+
+            case STATE_SCANNING_TOKEN:
+                if (isValidTokenChar(currChar))
+                {
+                    break;
+                }
+                else if (isWhiteSpace(currChar))
+                {
+                    token = m_tokens.substring(m_scanStart, m_curPos);
+                    m_state = STATE_LOOKING_FOR_COMMA;
+                }
+                else if (',' == currChar)
+                {
+                    token = m_tokens.substring(m_scanStart, m_curPos);
+                    m_state = STATE_LOOKING_FOR_TOKEN;
+                }
+                else
+                {
+                    m_state = STATE_PARSING_ERROR;
+                    throw new SaslException("Invalid token character at position " + m_curPos);
+                }
+                break;
+
+
+            case STATE_LOOKING_FOR_COMMA:
+                if (isWhiteSpace(currChar))
+                    break;
+                else if (currChar == ',')
+                    m_state = STATE_LOOKING_FOR_TOKEN;
+                else
+                {
+                    m_state = STATE_PARSING_ERROR;
+                    throw new SaslException("Expected a comma, found '" +
+                                            currChar + "' at postion " +
+                                            m_curPos);
+                }
+                break;
+            }
+            m_curPos++;
+        } /* end while loop */
+
+        if (token == null)
+        {    /* check the ending state */
+            switch (m_state)
+            {
+            case STATE_SCANNING_TOKEN:
+                token = m_tokens.substring(m_scanStart);
+                m_state = STATE_DONE;
+                break;
+
+            case STATE_LOOKING_FOR_FIRST_TOKEN:
+            case STATE_LOOKING_FOR_COMMA:
+                break;
+
+            case STATE_LOOKING_FOR_TOKEN:
+                throw new SaslException("Trialing comma");
+            }
+        }
+
+        return token;
+    }
+
+    /**
+     * This function returns TRUE if the character is a valid token character.
+     *
+     *     token          = 1*<any CHAR except CTLs or separators>
+     *
+     *      separators     = "(" | ")" | "<" | ">" | "@"
+     *                     | "," | ";" | ":" | "\" | <">
+     *                     | "/" | "[" | "]" | "?" | "="
+     *                     | "{" | "}" | SP | HT
+     *
+     *      CTL            = <any US-ASCII control character
+     *                       (octets 0 - 31) and DEL (127)>
+     *
+     *      CHAR           = <any US-ASCII character (octets 0 - 127)>
+     *
+     * @param c  character to be validated
+     *
+     * @return True if character is valid Token character else it returns 
+     * false
+     */
+    boolean isValidTokenChar(
+        char c)
+    {
+        if ( ( (c >= '\u0000') && (c <='\u0020') ) ||
+             ( (c >= '\u003a') && (c <= '\u0040') ) ||
+             ( (c >= '\u005b') && (c <= '\u005d') ) ||
+             ('\u002c' == c) ||
+             ('\u0025' == c) ||
+             ('\u0028' == c) ||
+             ('\u0029' == c) ||
+             ('\u007b' == c) ||
+             ('\u007d' == c) ||
+             ('\u007f' == c) )
+            return false;
+
+        return true;
+    }
+
+    /**
+     * This function returns TRUE if the character is linear white space (LWS).
+     *         LWS = [CRLF] 1*( SP | HT )
+     *
+     * @param c  character to be validated
+     *
+     * @return True if character is liner whitespace else it returns false
+     */
+    boolean isWhiteSpace(
+        char c)
+    {
+        if ( ('\t' == c) || // HORIZONTAL TABULATION.
+             ('\n' == c) || // LINE FEED.
+             ('\r' == c) || // CARRIAGE RETURN.
+             ('\u0020' == c) )
+            return true;
+
+        return false;
+    }
+
+}
+