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 */ 017package org.apache.activemq.util; 018 019import java.io.IOException; 020import java.io.InputStream; 021 022/** 023 * Very similar to the java.io.ByteArrayInputStream but this version is not 024 * thread safe. 025 */ 026public class ByteArrayInputStream extends InputStream { 027 028 byte buffer[]; 029 int limit; 030 int pos; 031 int mark; 032 033 public ByteArrayInputStream(byte data[]) { 034 this(data, 0, data.length); 035 } 036 037 public ByteArrayInputStream(ByteSequence sequence) { 038 this(sequence.getData(), sequence.getOffset(), sequence.getLength()); 039 } 040 041 public ByteArrayInputStream(byte data[], int offset, int size) { 042 this.buffer = data; 043 this.mark = offset; 044 this.pos = offset; 045 this.limit = offset + size; 046 } 047 048 public int read() throws IOException { 049 if (pos < limit) { 050 return buffer[pos++] & 0xff; 051 } else { 052 return -1; 053 } 054 } 055 056 public int read(byte[] b) throws IOException { 057 return read(b, 0, b.length); 058 } 059 060 public int read(byte b[], int off, int len) { 061 if (pos < limit) { 062 len = Math.min(len, limit - pos); 063 if (len > 0) { 064 System.arraycopy(buffer, pos, b, off, len); 065 pos += len; 066 } 067 return len; 068 } else { 069 return -1; 070 } 071 } 072 073 public long skip(long len) throws IOException { 074 if (pos < limit) { 075 len = Math.min(len, limit - pos); 076 if (len > 0) { 077 pos += len; 078 } 079 return len; 080 } else { 081 return -1; 082 } 083 } 084 085 public int available() { 086 return limit - pos; 087 } 088 089 public boolean markSupported() { 090 return true; 091 } 092 093 public void mark(int markpos) { 094 mark = pos; 095 } 096 097 public void reset() { 098 pos = mark; 099 } 100}