/* * 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;
publicclass 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
*/ publicstatic 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();
}
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