| /* |
| * 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; |
| |
| |
| /** |
| * Useful methods for Content-Type processing |
| * |
| * @author James Duncan Davidson [duncan@eng.sun.com] |
| * @author James Todd [gonzo@eng.sun.com] |
| * @author Jason Hunter [jch@eng.sun.com] |
| * @author Harish Prabandham |
| * @author 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, |
| * <code>null</code> is returned. |
| * |
| * @param 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. |
| * |
| * @param type Content type |
| * @return 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; |
| } |
| |
| } |