| /* |
| * Copyright 1999-2004 The Apache Software Foundation |
| * |
| * Licensed 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 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 { |
| |
| // Basically return everything after ";charset=" |
| // If no charset specified, use the HTTP default (ASCII) character set. |
| public static String getCharsetFromContentType(String type) { |
| if (type == null) { |
| return null; |
| } |
| int semi = type.indexOf(";"); |
| if (semi == -1) { |
| return null; |
| } |
| int charsetLocation = type.indexOf("charset=", semi); |
| if (charsetLocation == -1) { |
| return null; |
| } |
| String afterCharset = type.substring(charsetLocation + 8); |
| // The charset value in a Content-Type header is allowed to be quoted |
| // and charset values can't contain quotes. Just convert any quote |
| // chars into spaces and let trim clean things up. |
| afterCharset = afterCharset.replace('"', ' '); |
| String encoding = afterCharset.trim(); |
| return encoding; |
| } |
| |
| |
| /** |
| * 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; |
| } |
| |
| } |