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 package org.fusesource.hawtbuf; 018 019 import java.io.IOException; 020 import java.io.InputStream; 021 022 023 /** 024 * Very similar to the java.io.ByteArrayInputStream but this version is not 025 * thread safe. 026 * 027 * @author <a href="http://hiramchirino.com">Hiram Chirino</a> 028 */ 029 final public class BufferInputStream extends InputStream { 030 031 byte buffer[]; 032 int limit; 033 int pos; 034 int mark; 035 036 public BufferInputStream(byte data[]) { 037 this(data, 0, data.length); 038 } 039 040 public BufferInputStream(Buffer sequence) { 041 this(sequence.getData(), sequence.getOffset(), sequence.getLength()); 042 } 043 044 public BufferInputStream(byte data[], int offset, int size) { 045 this.buffer = data; 046 this.mark = offset; 047 this.pos = offset; 048 this.limit = offset + size; 049 } 050 051 public int read() throws IOException { 052 if (pos < limit) { 053 return buffer[pos++] & 0xff; 054 } else { 055 return -1; 056 } 057 } 058 059 public int read(byte[] b) throws IOException { 060 return read(b, 0, b.length); 061 } 062 063 public int read(byte b[], int off, int len) { 064 if (pos < limit) { 065 len = Math.min(len, limit - pos); 066 System.arraycopy(buffer, pos, b, off, len); 067 pos += len; 068 return len; 069 } else { 070 return -1; 071 } 072 } 073 074 public Buffer readBuffer(int len) { 075 Buffer rc=null; 076 if (pos < limit) { 077 len = Math.min(len, limit - pos); 078 rc = new Buffer(buffer, pos, len); 079 pos += len; 080 } 081 return rc; 082 } 083 084 public long skip(long len) throws IOException { 085 if (pos < limit) { 086 len = Math.min(len, limit - pos); 087 if (len > 0) { 088 pos += len; 089 } 090 return len; 091 } else { 092 return -1; 093 } 094 } 095 096 public int available() { 097 return limit - pos; 098 } 099 100 public boolean markSupported() { 101 return true; 102 } 103 104 public void mark(int markpos) { 105 mark = pos; 106 } 107 108 public void reset() { 109 pos = mark; 110 } 111 112 }