| /** |
| * 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.activemq.util; |
| |
| public class ByteSequence { |
| |
| public byte[] data; |
| public int offset; |
| public int length; |
| |
| public ByteSequence() { |
| } |
| |
| public ByteSequence(byte data[]) { |
| this.data = data; |
| this.offset = 0; |
| this.length = data.length; |
| } |
| |
| public ByteSequence(byte data[], int offset, int length) { |
| this.data = data; |
| this.offset = offset; |
| this.length = length; |
| } |
| |
| public byte[] getData() { |
| return data; |
| } |
| |
| public int getLength() { |
| return length; |
| } |
| |
| public int getOffset() { |
| return offset; |
| } |
| |
| public int remaining() { return length - offset; } |
| |
| public void setData(byte[] data) { |
| this.data = data; |
| } |
| |
| public void setLength(int length) { |
| this.length = length; |
| } |
| |
| public void setOffset(int offset) { |
| this.offset = offset; |
| } |
| |
| public void compact() { |
| if (length != data.length) { |
| byte t[] = new byte[length]; |
| System.arraycopy(data, offset, t, 0, length); |
| data = t; |
| offset = 0; |
| } |
| } |
| |
| public void reset() { |
| length = remaining(); |
| if (length > 0) { |
| System.arraycopy(data, offset, data, 0, length); |
| } else { |
| length = 0; |
| } |
| offset = 0; |
| } |
| |
| public int indexOf(ByteSequence needle, int pos) { |
| int max = length - needle.length - offset; |
| for (int i = pos; i < max; i++) { |
| if (matches(needle, i)) { |
| return i; |
| } |
| } |
| return -1; |
| } |
| |
| private boolean matches(ByteSequence needle, int pos) { |
| for (int i = 0; i < needle.length; i++) { |
| if( data[offset + pos+ i] != needle.data[needle.offset + i] ) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| private byte getByte(int i) { |
| return data[offset+i]; |
| } |
| |
| final public int indexOf(byte value, int pos) { |
| for (int i = pos; i < length; i++) { |
| if (data[offset + i] == value) { |
| return i; |
| } |
| } |
| return -1; |
| } |
| |
| public boolean startsWith(final byte[] bytes) { |
| if (length - offset < bytes.length) { |
| return false; |
| } |
| for (int i = 0; i<bytes.length; i++) { |
| if (data[offset+i] != bytes[i]) { |
| return false; |
| } |
| } |
| return true; |
| } |
| } |