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.commons.compress.compressors.deflate64; 019 020import java.io.IOException; 021import java.io.InputStream; 022 023import org.apache.commons.compress.compressors.CompressorInputStream; 024import static org.apache.commons.compress.utils.IOUtils.closeQuietly; 025 026/** 027 * Deflate64 decompressor. 028 * 029 * @since 1.16 030 * @NotThreadSafe 031 */ 032public class Deflate64CompressorInputStream extends CompressorInputStream { 033 private InputStream originalStream; 034 private HuffmanDecoder decoder; 035 private final byte[] oneByte = new byte[1]; 036 037 /** 038 * Constructs a Deflate64CompressorInputStream. 039 * 040 * @param in the stream to read from 041 */ 042 public Deflate64CompressorInputStream(InputStream in) { 043 this(new HuffmanDecoder(in)); 044 originalStream = in; 045 } 046 047 Deflate64CompressorInputStream(HuffmanDecoder decoder) { 048 this.decoder = decoder; 049 } 050 051 /** 052 * @throws java.io.EOFException if the underlying stream is exhausted before the end of defalted data was reached. 053 */ 054 @Override 055 public int read() throws IOException { 056 while (true) { 057 int r = read(oneByte); 058 switch (r) { 059 case 1: 060 return oneByte[0] & 0xFF; 061 case -1: 062 return -1; 063 case 0: 064 continue; 065 default: 066 throw new IllegalStateException("Invalid return value from read: " + r); 067 } 068 } 069 } 070 071 /** 072 * @throws java.io.EOFException if the underlying stream is exhausted before the end of defalted data was reached. 073 */ 074 @Override 075 public int read(byte[] b, int off, int len) throws IOException { 076 int read = -1; 077 if (decoder != null) { 078 read = decoder.decode(b, off, len); 079 count(read); 080 if (read == -1) { 081 closeDecoder(); 082 } 083 } 084 return read; 085 } 086 087 @Override 088 public int available() throws IOException { 089 return decoder != null ? decoder.available() : 0; 090 } 091 092 @Override 093 public void close() throws IOException { 094 closeDecoder(); 095 if (originalStream != null) { 096 originalStream.close(); 097 originalStream = null; 098 } 099 } 100 101 private void closeDecoder() { 102 closeQuietly(decoder); 103 decoder = null; 104 } 105}