| /* |
| * |
| * 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) |
| { |
| return hex(bytes, limit, ""); |
| } |
| |
| public static String hex(byte[] bytes, int limit, CharSequence separator) |
| { |
| 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(i != bytes.length - 1) |
| { |
| sb.append(separator); |
| } |
| } |
| if(bytes != null && bytes.length>limit) |
| { |
| sb.append("..."); |
| } |
| return sb.toString(); |
| } |
| } |