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1   /*
2    * ====================================================================
3    * Licensed to the Apache Software Foundation (ASF) under one
4    * or more contributor license agreements.  See the NOTICE file
5    * distributed with this work for additional information
6    * regarding copyright ownership.  The ASF licenses this file
7    * to you under the Apache License, Version 2.0 (the
8    * "License"); you may not use this file except in compliance
9    * with the License.  You may obtain a copy of the License at
10   *
11   *   http://www.apache.org/licenses/LICENSE-2.0
12   *
13   * Unless required by applicable law or agreed to in writing,
14   * software distributed under the License is distributed on an
15   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
16   * KIND, either express or implied.  See the License for the
17   * specific language governing permissions and limitations
18   * under the License.
19   * ====================================================================
20   *
21   * This software consists of voluntary contributions made by many
22   * individuals on behalf of the Apache Software Foundation.  For more
23   * information on the Apache Software Foundation, please see
24   * <http://www.apache.org/>.
25   *
26   */
27  
28  package org.apache.http.impl.cookie;
29  
30  import java.util.ArrayList;
31  import java.util.List;
32  
33  import org.apache.http.HeaderElement;
34  import org.apache.http.NameValuePair;
35  import org.apache.http.ParseException;
36  import org.apache.http.annotation.Immutable;
37  import org.apache.http.message.BasicHeaderElement;
38  import org.apache.http.message.BasicNameValuePair;
39  import org.apache.http.message.ParserCursor;
40  import org.apache.http.protocol.HTTP;
41  import org.apache.http.util.Args;
42  import org.apache.http.util.CharArrayBuffer;
43  
44  /**
45   *
46   * @since 4.0
47   */
48  @Immutable
49  public class NetscapeDraftHeaderParser {
50  
51      public final static NetscapeDraftHeaderParser DEFAULT = new NetscapeDraftHeaderParser();
52  
53      public NetscapeDraftHeaderParser() {
54          super();
55      }
56  
57      public HeaderElement parseHeader(
58              final CharArrayBuffer buffer,
59              final ParserCursor cursor) throws ParseException {
60          Args.notNull(buffer, "Char array buffer");
61          Args.notNull(cursor, "Parser cursor");
62          final NameValuePair nvp = parseNameValuePair(buffer, cursor);
63          final List<NameValuePair> params = new ArrayList<NameValuePair>();
64          while (!cursor.atEnd()) {
65              final NameValuePair param = parseNameValuePair(buffer, cursor);
66              params.add(param);
67          }
68          return new BasicHeaderElement(
69                  nvp.getName(),
70                  nvp.getValue(), params.toArray(new NameValuePair[params.size()]));
71      }
72  
73      private NameValuePair parseNameValuePair(
74              final CharArrayBuffer buffer, final ParserCursor cursor) {
75          boolean terminated = false;
76  
77          int pos = cursor.getPos();
78          final int indexFrom = cursor.getPos();
79          final int indexTo = cursor.getUpperBound();
80  
81          // Find name
82          String name = null;
83          while (pos < indexTo) {
84              final char ch = buffer.charAt(pos);
85              if (ch == '=') {
86                  break;
87              }
88              if (ch == ';') {
89                  terminated = true;
90                  break;
91              }
92              pos++;
93          }
94  
95          if (pos == indexTo) {
96              terminated = true;
97              name = buffer.substringTrimmed(indexFrom, indexTo);
98          } else {
99              name = buffer.substringTrimmed(indexFrom, pos);
100             pos++;
101         }
102 
103         if (terminated) {
104             cursor.updatePos(pos);
105             return new BasicNameValuePair(name, null);
106         }
107 
108         // Find value
109         String value = null;
110         int i1 = pos;
111 
112         while (pos < indexTo) {
113             final char ch = buffer.charAt(pos);
114             if (ch == ';') {
115                 terminated = true;
116                 break;
117             }
118             pos++;
119         }
120 
121         int i2 = pos;
122         // Trim leading white spaces
123         while (i1 < i2 && (HTTP.isWhitespace(buffer.charAt(i1)))) {
124             i1++;
125         }
126         // Trim trailing white spaces
127         while ((i2 > i1) && (HTTP.isWhitespace(buffer.charAt(i2 - 1)))) {
128             i2--;
129         }
130         value = buffer.substring(i1, i2);
131         if (terminated) {
132             pos++;
133         }
134         cursor.updatePos(pos);
135         return new BasicNameValuePair(name, value);
136     }
137 
138 }