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 /*
  *  Licensed to the Apache Software Foundation (ASF) under one or more
  *  contributor license agreements.  See the NOTICE file distributed with
  *  this work for additional information regarding copyright ownership.
  *  The ASF licenses this file to You under the Apache License, Version 2.0
  *  (the "License"); you may not use this file except in compliance with
  *  the License.  You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package org.apache.tomcat.util.http;


Usefull methods for Content-Type processing

Author(s):
James Duncan Davidson [duncan@eng.sun.com]
James Todd [gonzo@eng.sun.com]
Jason Hunter [jch@eng.sun.com]
Harish Prabandham
costin@eng.sun.com
public class ContentType {

    
Parse the character encoding from the specified content type header. If the content type is null, or there is no explicit character encoding, null is returned.

Parameters:
contentType a content type header
    public static String getCharsetFromContentType(String contentType) {
        if (contentType == null)
            return (null);
        int start = contentType.indexOf("charset=");
        if (start < 0)
            return (null);
        String encoding = contentType.substring(start + 8);
        int end = encoding.indexOf(';');
        if (end >= 0)
            encoding = encoding.substring(0, end);
        encoding = encoding.trim();
        if ((encoding.length() > 2) && (encoding.startsWith("\""))
            && (encoding.endsWith("\"")))
            encoding = encoding.substring(1, encoding.length() - 1);
        return (encoding.trim());
    }


    
Returns true if the given content type contains a charset component, false otherwise.

Parameters:
type Content type
Returns:
true if the given content type contains a charset component, false otherwise
    public static boolean hasCharset(String type) {
        boolean hasCharset = false;
        int len = type.length();
        int index = type.indexOf(';');
        while (index != -1) {
            index++;
            while (index < len && Character.isSpace(type.charAt(index))) {
                index++;
            }
            if (index+8 < len
                    && type.charAt(index) == 'c'
                    && type.charAt(index+1) == 'h'
                    && type.charAt(index+2) == 'a'
                    && type.charAt(index+3) == 'r'
                    && type.charAt(index+4) == 's'
                    && type.charAt(index+5) == 'e'
                    && type.charAt(index+6) == 't'
                    && type.charAt(index+7) == '=') {
                hasCharset = true;
                break;
            }
            index = type.indexOf(';'index);
        }
        return hasCharset;
    }
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