/* | |
* Copyright 2015 Open Networking Laboratory | |
* | |
* 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.onlab.util; | |
import org.jboss.netty.buffer.ChannelBuffer; | |
import org.slf4j.Logger; | |
import org.slf4j.LoggerFactory; | |
/** | |
* HexDump class an utility to dump buffer in hex format. | |
*/ | |
public final class HexDump { | |
protected static final Logger log = LoggerFactory.getLogger(HexDump.class); | |
private HexDump() { | |
} | |
/** | |
* Dump the buffer content in hex format. | |
* | |
* @param buff buffer content to dump in hex format | |
*/ | |
public static void dump(ChannelBuffer buff) { | |
buff.markReaderIndex(); | |
try { | |
do { | |
StringBuilder sb = new StringBuilder(); | |
for (int k = 0; (k < 16) && (buff.readableBytes() != 0); ++k) { | |
if (0 == k % 4) { | |
sb.append(String.format(" ")); // blank after 4 bytes | |
} | |
sb.append(String.format("%02X ", buff.readByte())); | |
} | |
log.debug(sb.toString()); | |
} while (buff.readableBytes() != 0); | |
} catch (Exception e) { | |
log.error("[HexDump] Invalid buffer: " + e.toString()); | |
} | |
buff.resetReaderIndex(); | |
} | |
} |