54 lines
2.0 KiB
Java
54 lines
2.0 KiB
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.tomcat.util.http;
|
|
|
|
public class HeaderUtil {
|
|
|
|
/**
|
|
* Converts an HTTP header line in byte form to a printable String.
|
|
* Bytes corresponding to visible ASCII characters will converted to those
|
|
* characters. All other bytes (0x00 to 0x1F, 0x7F to OxFF) will be
|
|
* represented in 0xNN form.
|
|
*
|
|
* @param bytes Contains an HTTP header line
|
|
* @param offset The start position of the header line in the array
|
|
* @param len The length of the HTTP header line
|
|
*
|
|
* @return A String with non-printing characters replaced by the 0xNN
|
|
* equivalent
|
|
*/
|
|
public static String toPrintableString(byte[] bytes, int offset, int len) {
|
|
StringBuilder result = new StringBuilder();
|
|
for (int i = offset; i < offset + len; i++) {
|
|
char c = (char) (bytes[i] & 0xFF);
|
|
if (c < 0x20 || c > 0x7E) {
|
|
result.append("0x");
|
|
result.append(Character.forDigit((c >> 4) & 0xF, 16));
|
|
result.append(Character.forDigit((c) & 0xF, 16));
|
|
} else {
|
|
result.append(c);
|
|
}
|
|
}
|
|
return result.toString();
|
|
}
|
|
|
|
|
|
private HeaderUtil() {
|
|
// Utility class. Hide default constructor.
|
|
}
|
|
}
|