yoko-core/src/main/java/org/apache/yoko/orb/OB/URLUtil.java

/*
 *  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.yoko.orb.OB;

class URLUtil {
    // 
    // Remove URL escape sequences from a string
    // 
    public static String unescapeURL(final String str) {
        final int len = str.length();
        char[] buf = new char[len];
        int bpos = 0, pos = 0;

        while (pos < len) {
            char ch = str.charAt(pos);

            //
            // Escape sequence '%' must be followed by
            // 2 valid characters 0-9, A-F, a-f
            //
            if (ch == '%') {
                if (pos + 2 >= len)
                    throw new org.omg.CORBA.BAD_PARAM(org.apache.yoko.orb.OB.MinorCodes
                            .describeBadParam(org.apache.yoko.orb.OB.MinorCodes.MinorBadAddress)
                            + ": bad escape sequence length",
                            org.apache.yoko.orb.OB.MinorCodes.MinorBadAddress,
                            org.omg.CORBA.CompletionStatus.COMPLETED_NO);

                int c1 = Character.digit(str.charAt(++pos), 16);
                int c2 = Character.digit(str.charAt(++pos), 16);

                if (c1 == -1 || c2 == -1)
                    throw new org.omg.CORBA.BAD_PARAM(org.apache.yoko.orb.OB.MinorCodes
                            .describeBadParam(org.apache.yoko.orb.OB.MinorCodes.MinorOther)
                            + ": escape sequence contains invalid characters",
                            org.apache.yoko.orb.OB.MinorCodes.MinorOther,
                            org.omg.CORBA.CompletionStatus.COMPLETED_NO);

                ch = (char) ((c1 << 4) | c2);
            }
            buf[bpos++] = ch;
            ++pos;
        }

        return new String(buf, 0, bpos);
    }
}