InflaterInputStream.java revision 86acc043d3334651ee26c65467d78d6cefedd397
1f7c6911047d63bc76292f55ce538da32818dd931Jesse Wilson/* 2adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * Licensed to the Apache Software Foundation (ASF) under one or more 3adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * contributor license agreements. See the NOTICE file distributed with 4adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * this work for additional information regarding copyright ownership. 5adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * The ASF licenses this file to You under the Apache License, Version 2.0 6adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * (the "License"); you may not use this file except in compliance with 7adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * the License. You may obtain a copy of the License at 8f7c6911047d63bc76292f55ce538da32818dd931Jesse Wilson * 9adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * http://www.apache.org/licenses/LICENSE-2.0 10f7c6911047d63bc76292f55ce538da32818dd931Jesse Wilson * 11adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * Unless required by applicable law or agreed to in writing, software 12adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * distributed under the License is distributed on an "AS IS" BASIS, 13adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * See the License for the specific language governing permissions and 15adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * limitations under the License. 16adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 17adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 18adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Projectpackage java.util.zip; 19adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 20adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Projectimport java.io.EOFException; 21adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Projectimport java.io.FilterInputStream; 22adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Projectimport java.io.IOException; 23adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Projectimport java.io.InputStream; 24b9cc455ed89df1a0cf4186c92b352c9649995d96Elliott Hughesimport java.util.Arrays; 256186821cb13f4ac7ff50950c813394367e021eaeJesse Wilsonimport libcore.io.Streams; 26adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 27adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project/** 28adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * This class provides an implementation of {@code FilterInputStream} that 298cfafd33742282beb20c6971aafc1feb35e3fa5eJesse Wilson * decompresses data that was compressed using the <i>DEFLATE</i> algorithm 30adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * (see <a href="http://www.gzip.org/algorithm.txt">specification</a>). 31adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * Basically it wraps the {@code Inflater} class and takes care of the 32adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * buffering. 3357995e8186b54515d5a03bf2ab104c3dc247f1b6Jesse Wilson * 34adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @see Inflater 35adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @see DeflaterOutputStream 36adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 37adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Projectpublic class InflaterInputStream extends FilterInputStream { 38adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 39adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 40adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * The inflater used for this stream. 41adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 42adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project protected Inflater inf; 43adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 44adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 45adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * The input buffer used for decompression. 46adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 47adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project protected byte[] buf; 48adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 49adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 50adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * The length of the buffer. 51adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 52adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project protected int len; 53adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 54adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project boolean closed; 55adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 560146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson /** 570146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson * True if this stream's last byte has been returned to the user. This 580146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson * could be because the underlying stream has been exhausted, or if errors 590146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson * were encountered while inflating that stream. 600146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson */ 61adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project boolean eof; 62adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 63adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project static final int BUF_SIZE = 512; 64adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 65fb0ec0e650bf8be35acb0d47da0311a7c446aa33Elliott Hughes int nativeEndBufSize = 0; 66adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 67adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 68adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * This is the most basic constructor. You only need to pass the {@code 69adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * InputStream} from which the compressed data is to be read from. Default 70adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * settings for the {@code Inflater} and internal buffer are be used. In 71adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * particular the Inflater expects a ZLIB header from the input stream. 7257995e8186b54515d5a03bf2ab104c3dc247f1b6Jesse Wilson * 73adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @param is 74adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * the {@code InputStream} to read data from. 75adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 76adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project public InflaterInputStream(InputStream is) { 77adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project this(is, new Inflater(), BUF_SIZE); 78adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 79adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 80adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 81adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * This constructor lets you pass a specifically initialized Inflater, 82adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * for example one that expects no ZLIB header. 8357995e8186b54515d5a03bf2ab104c3dc247f1b6Jesse Wilson * 84adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @param is 85adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * the {@code InputStream} to read data from. 86018b67accb28954d35f3cd697be3428e9b45b7d8Jesse Wilson * @param inflater 878cfafd33742282beb20c6971aafc1feb35e3fa5eJesse Wilson * the specific {@code Inflater} for decompressing data. 88adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 89018b67accb28954d35f3cd697be3428e9b45b7d8Jesse Wilson public InflaterInputStream(InputStream is, Inflater inflater) { 90018b67accb28954d35f3cd697be3428e9b45b7d8Jesse Wilson this(is, inflater, BUF_SIZE); 91adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 92adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 93adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 94adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * This constructor lets you specify both the {@code Inflater} as well as 95adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * the internal buffer size to be used. 9657995e8186b54515d5a03bf2ab104c3dc247f1b6Jesse Wilson * 97adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @param is 98adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * the {@code InputStream} to read data from. 99018b67accb28954d35f3cd697be3428e9b45b7d8Jesse Wilson * @param inflater 1008cfafd33742282beb20c6971aafc1feb35e3fa5eJesse Wilson * the specific {@code Inflater} for decompressing data. 101adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @param bsize 102adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * the size to be used for the internal buffer. 103adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 104018b67accb28954d35f3cd697be3428e9b45b7d8Jesse Wilson public InflaterInputStream(InputStream is, Inflater inflater, int bsize) { 105adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project super(is); 10686acc043d3334651ee26c65467d78d6cefedd397Kenny Root if (is == null) { 10786acc043d3334651ee26c65467d78d6cefedd397Kenny Root throw new NullPointerException("is == null"); 10886acc043d3334651ee26c65467d78d6cefedd397Kenny Root } else if (inflater == null) { 10986acc043d3334651ee26c65467d78d6cefedd397Kenny Root throw new NullPointerException("inflater == null"); 110adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 111adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project if (bsize <= 0) { 112adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project throw new IllegalArgumentException(); 113adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 114018b67accb28954d35f3cd697be3428e9b45b7d8Jesse Wilson this.inf = inflater; 115adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project if (is instanceof ZipFile.RAFStream) { 116adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project nativeEndBufSize = bsize; 117adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } else { 118adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project buf = new byte[bsize]; 119adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 120adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 121adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 122adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 123adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * Reads a single byte of decompressed data. 12457995e8186b54515d5a03bf2ab104c3dc247f1b6Jesse Wilson * 125adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @return the byte read. 126adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @throws IOException 127adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * if an error occurs reading the byte. 128adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 129ff8234c90ecab9f1db368924bf92a5b16460f9b5Elliott Hughes @Override public int read() throws IOException { 130ff8234c90ecab9f1db368924bf92a5b16460f9b5Elliott Hughes return Streams.readSingleByte(this); 131adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 132adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 133adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 134b9cc455ed89df1a0cf4186c92b352c9649995d96Elliott Hughes * Reads up to {@code byteCount} bytes of decompressed data and stores it in 135b9cc455ed89df1a0cf4186c92b352c9649995d96Elliott Hughes * {@code buffer} starting at {@code offset}. 13657995e8186b54515d5a03bf2ab104c3dc247f1b6Jesse Wilson * 137adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @return Number of uncompressed bytes read 138adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 139adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project @Override 140b9cc455ed89df1a0cf4186c92b352c9649995d96Elliott Hughes public int read(byte[] buffer, int offset, int byteCount) throws IOException { 14160eb73fc9f0636c3d0bda5baba641a5f88f8476fElliott Hughes checkClosed(); 142b9cc455ed89df1a0cf4186c92b352c9649995d96Elliott Hughes Arrays.checkOffsetAndCount(buffer.length, offset, byteCount); 143adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 144b9cc455ed89df1a0cf4186c92b352c9649995d96Elliott Hughes if (byteCount == 0) { 145adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project return 0; 146adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 147adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 1480146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson if (eof) { 149adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project return -1; 150adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 151adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 1520146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson do { 1530146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson if (inf.needsInput()) { 1540146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson fill(); 1550146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson } 1560146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson // Invariant: if reading returns -1 or throws, eof must be true. 1570146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson // It may also be true if the next read() should return -1. 1580146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson try { 159b9cc455ed89df1a0cf4186c92b352c9649995d96Elliott Hughes int result = inf.inflate(buffer, offset, byteCount); 1600146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson eof = inf.finished(); 161adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project if (result > 0) { 162adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project return result; 1630146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson } else if (eof) { 164adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project return -1; 165adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } else if (inf.needsDictionary()) { 1660146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson eof = true; 167adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project return -1; 168adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } else if (len == -1) { 1690146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson eof = true; 170adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project throw new EOFException(); 17157995e8186b54515d5a03bf2ab104c3dc247f1b6Jesse Wilson // If result == 0, fill() and try again 172adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 1730146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson } catch (DataFormatException e) { 1740146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson eof = true; 1750146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson if (len == -1) { 1760146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson throw new EOFException(); 1770146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson } 1780146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson throw (IOException) (new IOException().initCause(e)); 1790146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson } 1800146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson } while (true); 181adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 182adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 183adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 184adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * Fills the input buffer with data to be decompressed. 18557995e8186b54515d5a03bf2ab104c3dc247f1b6Jesse Wilson * 186adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @throws IOException 187adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * if an {@code IOException} occurs. 188adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 189adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project protected void fill() throws IOException { 19060eb73fc9f0636c3d0bda5baba641a5f88f8476fElliott Hughes checkClosed(); 191adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project if (nativeEndBufSize > 0) { 192adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project ZipFile.RAFStream is = (ZipFile.RAFStream)in; 193adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project synchronized (is.mSharedRaf) { 194adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project long len = is.mLength - is.mOffset; 195adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project if (len > nativeEndBufSize) len = nativeEndBufSize; 196866e7ae17a3da81a02b0b144e0c9c2b3196d293aElliott Hughes int cnt = inf.setFileInput(is.mSharedRaf.getFD(), is.mOffset, nativeEndBufSize); 197adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project is.skip(cnt); 198adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 199adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } else { 200adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project if ((len = in.read(buf)) > 0) { 201adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project inf.setInput(buf, 0, len); 202adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 203adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 204adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 205adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 206adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 2073541c79d5058b86e742867b4ee5811a1de01de1fJesse Wilson * Skips up to {@code byteCount} bytes of uncompressed data. 20857995e8186b54515d5a03bf2ab104c3dc247f1b6Jesse Wilson * 2093541c79d5058b86e742867b4ee5811a1de01de1fJesse Wilson * @param byteCount the number of bytes to skip. 210adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @return the number of uncompressed bytes skipped. 211f9480f317cddcec859025833b748f096247a40aaElliott Hughes * @throws IllegalArgumentException if {@code byteCount < 0}. 2123541c79d5058b86e742867b4ee5811a1de01de1fJesse Wilson * @throws IOException if an error occurs skipping. 213adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 214adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project @Override 2153541c79d5058b86e742867b4ee5811a1de01de1fJesse Wilson public long skip(long byteCount) throws IOException { 216f9480f317cddcec859025833b748f096247a40aaElliott Hughes if (byteCount < 0) { 217f9480f317cddcec859025833b748f096247a40aaElliott Hughes throw new IllegalArgumentException("byteCount < 0"); 218f9480f317cddcec859025833b748f096247a40aaElliott Hughes } 2193541c79d5058b86e742867b4ee5811a1de01de1fJesse Wilson return Streams.skipByReading(this, byteCount); 220adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 221adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 222adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 2230146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson * Returns 0 when when this stream has exhausted its input; and 1 otherwise. 2240146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson * A result of 1 does not guarantee that further bytes can be returned, 2250146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson * with or without blocking. 2260146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson * 2270146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson * <p>Although consistent with the RI, this behavior is inconsistent with 2280146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson * {@link InputStream#available()}, and violates the <a 2290146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson * href="http://en.wikipedia.org/wiki/Liskov_substitution_principle">Liskov 2300146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson * Substitution Principle</a>. This method should not be used. 23157995e8186b54515d5a03bf2ab104c3dc247f1b6Jesse Wilson * 2320146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson * @return 0 if no further bytes are available. Otherwise returns 1, 2330146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson * which suggests (but does not guarantee) that additional bytes are 2340146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson * available. 235582d926fbf5f5fd4800def67f86ecfedee44681eElliott Hughes * @throws IOException if this stream is closed or an error occurs 236adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 237adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project @Override 238adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project public int available() throws IOException { 23960eb73fc9f0636c3d0bda5baba641a5f88f8476fElliott Hughes checkClosed(); 240adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project if (eof) { 241adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project return 0; 242adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 243adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project return 1; 244adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 245adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 246adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 247adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * Closes the input stream. 24857995e8186b54515d5a03bf2ab104c3dc247f1b6Jesse Wilson * 249adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @throws IOException 250adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * If an error occurs closing the input stream. 251adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 252adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project @Override 253adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project public void close() throws IOException { 254adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project if (!closed) { 255adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project inf.end(); 256adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project closed = true; 257adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project eof = true; 258adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project super.close(); 259adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 260adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 26157995e8186b54515d5a03bf2ab104c3dc247f1b6Jesse Wilson 262adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 26357995e8186b54515d5a03bf2ab104c3dc247f1b6Jesse Wilson * Marks the current position in the stream. This implementation overrides 26457995e8186b54515d5a03bf2ab104c3dc247f1b6Jesse Wilson * the super type implementation to do nothing at all. 26557995e8186b54515d5a03bf2ab104c3dc247f1b6Jesse Wilson * 266adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @param readlimit 267adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * of no use. 268adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 269adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project @Override 270adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project public void mark(int readlimit) { 271adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project // do nothing 272adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 273adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 274adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 275adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * Reset the position of the stream to the last marked position. This 276adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * implementation overrides the supertype implementation and always throws 277adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * an {@link IOException IOException} when called. 27857995e8186b54515d5a03bf2ab104c3dc247f1b6Jesse Wilson * 279adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @throws IOException 280adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * if the method is called 281adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 282adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project @Override 28357995e8186b54515d5a03bf2ab104c3dc247f1b6Jesse Wilson public void reset() throws IOException { 284adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project throw new IOException(); 285adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 28657995e8186b54515d5a03bf2ab104c3dc247f1b6Jesse Wilson 287adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 288adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * Returns whether the receiver implements {@code mark} semantics. This type 289adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * does not support {@code mark()}, so always responds {@code false}. 29057995e8186b54515d5a03bf2ab104c3dc247f1b6Jesse Wilson * 291adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @return false, always 292adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 293adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project @Override 294adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project public boolean markSupported() { 295adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project return false; 296adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 297adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 29860eb73fc9f0636c3d0bda5baba641a5f88f8476fElliott Hughes private void checkClosed() throws IOException { 29960eb73fc9f0636c3d0bda5baba641a5f88f8476fElliott Hughes if (closed) { 30060eb73fc9f0636c3d0bda5baba641a5f88f8476fElliott Hughes throw new IOException("Stream is closed"); 30160eb73fc9f0636c3d0bda5baba641a5f88f8476fElliott Hughes } 30260eb73fc9f0636c3d0bda5baba641a5f88f8476fElliott Hughes } 303adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project} 304