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/*
*
* 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.qpid.transport.util;
import static java.lang.Math.min;
import java.nio.ByteBuffer;
/**
* Functions
*
* @author Rafael H. Schloming
*/
public final class Functions
{
private static final char[] HEX_CHARACTERS =
{'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};
private Functions()
{
}
public static final int mod(int n, int m)
{
int r = n % m;
return r < 0 ? m + r : r;
}
public static final byte lsb(int i)
{
return (byte) (0xFF & i);
}
public static final byte lsb(long l)
{
return (byte) (0xFF & l);
}
public static final String str(ByteBuffer buf)
{
return str(buf, buf.remaining());
}
public static final String str(ByteBuffer buf, int limit)
{
return str(buf, limit,buf.position());
}
public static final String str(ByteBuffer buf, int limit,int start)
{
StringBuilder str = new StringBuilder();
str.append('"');
for (int i = start; i < min(buf.limit(), limit); i++)
{
byte c = buf.get(i);
if (c > 31 && c < 127 && c != '\\')
{
str.append((char)c);
}
else
{
str.append(String.format("\\x%02x", c));
}
}
str.append('"');
if (limit < buf.remaining())
{
str.append("...");
}
return str.toString();
}
public static final String str(byte[] bytes)
{
return str(ByteBuffer.wrap(bytes));
}
public static final String str(byte[] bytes, int limit)
{
return str(ByteBuffer.wrap(bytes), limit);
}
public static String hex(byte[] bytes, int limit)
{
limit = Math.min(limit, bytes == null ? 0 : bytes.length);
StringBuilder sb = new StringBuilder(3 + limit*2);
for(int i = 0; i < limit; i++)
{
sb.append(HEX_CHARACTERS[(((int)bytes[i]) & 0xf0)>>4]);
sb.append(HEX_CHARACTERS[(((int)bytes[i]) & 0x0f)]);
}
if(bytes != null && bytes.length>limit)
{
sb.append("...");
}
return sb.toString();
}
}
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