001/** 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017 018package org.apache.activemq.util; 019 020public class ByteSequence { 021 022 public byte[] data; 023 public int offset; 024 public int length; 025 026 public ByteSequence() { 027 } 028 029 public ByteSequence(byte data[]) { 030 this.data = data; 031 this.offset = 0; 032 this.length = data.length; 033 } 034 035 public ByteSequence(byte data[], int offset, int length) { 036 this.data = data; 037 this.offset = offset; 038 this.length = length; 039 } 040 041 public byte[] getData() { 042 return data; 043 } 044 045 public int getLength() { 046 return length; 047 } 048 049 public int getOffset() { 050 return offset; 051 } 052 053 public void setData(byte[] data) { 054 this.data = data; 055 } 056 057 public void setLength(int length) { 058 this.length = length; 059 } 060 061 public void setOffset(int offset) { 062 this.offset = offset; 063 } 064 065 public void compact() { 066 if (length != data.length) { 067 byte t[] = new byte[length]; 068 System.arraycopy(data, offset, t, 0, length); 069 data = t; 070 offset = 0; 071 } 072 } 073 074 public int indexOf(ByteSequence needle, int pos) { 075 int max = length - needle.length; 076 for (int i = pos; i < max; i++) { 077 if (matches(needle, i)) { 078 return i; 079 } 080 } 081 return -1; 082 } 083 084 private boolean matches(ByteSequence needle, int pos) { 085 for (int i = 0; i < needle.length; i++) { 086 if( data[offset + pos+ i] != needle.data[needle.offset + i] ) { 087 return false; 088 } 089 } 090 return true; 091 } 092 093 private byte getByte(int i) { 094 return data[offset+i]; 095 } 096 097 final public int indexOf(byte value, int pos) { 098 for (int i = pos; i < length; i++) { 099 if (data[offset + i] == value) { 100 return i; 101 } 102 } 103 return -1; 104 } 105}