InflaterInputStream.java revision f9480f317cddcec859025833b748f096247a40aa
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; 253541c79d5058b86e742867b4ee5811a1de01de1fJesse Wilsonimport libcore.base.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 65f7c6911047d63bc76292f55ce538da32818dd931Jesse Wilson int nativeEndBufSize = 0; // android-only 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); 106018b67accb28954d35f3cd697be3428e9b45b7d8Jesse Wilson if (is == null || inflater == null) { 107adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project throw new NullPointerException(); 108adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 109adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project if (bsize <= 0) { 110adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project throw new IllegalArgumentException(); 111adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 112018b67accb28954d35f3cd697be3428e9b45b7d8Jesse Wilson this.inf = inflater; 113f7c6911047d63bc76292f55ce538da32818dd931Jesse Wilson // BEGIN android-only 114adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project if (is instanceof ZipFile.RAFStream) { 115adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project nativeEndBufSize = bsize; 116adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } else { 117adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project buf = new byte[bsize]; 118adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 119f7c6911047d63bc76292f55ce538da32818dd931Jesse Wilson // END android-only 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 */ 129adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project @Override 130adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project public int read() throws IOException { 131adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project byte[] b = new byte[1]; 132adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project if (read(b, 0, 1) == -1) { 133adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project return -1; 134adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 135adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project return b[0] & 0xff; 136adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 137adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 138adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 139b9cc455ed89df1a0cf4186c92b352c9649995d96Elliott Hughes * Reads up to {@code byteCount} bytes of decompressed data and stores it in 140b9cc455ed89df1a0cf4186c92b352c9649995d96Elliott Hughes * {@code buffer} starting at {@code offset}. 14157995e8186b54515d5a03bf2ab104c3dc247f1b6Jesse Wilson * 142adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @return Number of uncompressed bytes read 143adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 144adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project @Override 145b9cc455ed89df1a0cf4186c92b352c9649995d96Elliott Hughes public int read(byte[] buffer, int offset, int byteCount) throws IOException { 14660eb73fc9f0636c3d0bda5baba641a5f88f8476fElliott Hughes checkClosed(); 147b9cc455ed89df1a0cf4186c92b352c9649995d96Elliott Hughes Arrays.checkOffsetAndCount(buffer.length, offset, byteCount); 148adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 149b9cc455ed89df1a0cf4186c92b352c9649995d96Elliott Hughes if (byteCount == 0) { 150adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project return 0; 151adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 152adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 1530146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson if (eof) { 154adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project return -1; 155adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 156adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 1570146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson do { 1580146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson if (inf.needsInput()) { 1590146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson fill(); 1600146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson } 1610146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson // Invariant: if reading returns -1 or throws, eof must be true. 1620146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson // It may also be true if the next read() should return -1. 1630146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson try { 164b9cc455ed89df1a0cf4186c92b352c9649995d96Elliott Hughes int result = inf.inflate(buffer, offset, byteCount); 1650146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson eof = inf.finished(); 166adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project if (result > 0) { 167adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project return result; 1680146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson } else if (eof) { 169adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project return -1; 170adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } else if (inf.needsDictionary()) { 1710146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson eof = true; 172adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project return -1; 173adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } else if (len == -1) { 1740146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson eof = true; 175adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project throw new EOFException(); 17657995e8186b54515d5a03bf2ab104c3dc247f1b6Jesse Wilson // If result == 0, fill() and try again 177adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 1780146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson } catch (DataFormatException e) { 1790146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson eof = true; 1800146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson if (len == -1) { 1810146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson throw new EOFException(); 1820146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson } 1830146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson throw (IOException) (new IOException().initCause(e)); 1840146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson } 1850146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson } while (true); 186adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 187adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 188adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 189adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * Fills the input buffer with data to be decompressed. 19057995e8186b54515d5a03bf2ab104c3dc247f1b6Jesse Wilson * 191adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @throws IOException 192adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * if an {@code IOException} occurs. 193adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 194adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project protected void fill() throws IOException { 19560eb73fc9f0636c3d0bda5baba641a5f88f8476fElliott Hughes checkClosed(); 196f7c6911047d63bc76292f55ce538da32818dd931Jesse Wilson // BEGIN android-only 197adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project if (nativeEndBufSize > 0) { 198adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project ZipFile.RAFStream is = (ZipFile.RAFStream)in; 199adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project synchronized (is.mSharedRaf) { 200adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project long len = is.mLength - is.mOffset; 201adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project if (len > nativeEndBufSize) len = nativeEndBufSize; 202adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project int cnt = inf.setFileInput(is.mSharedRaf.getFD(), is.mOffset, (int)nativeEndBufSize); 203adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project is.skip(cnt); 204adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 205adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } else { 206adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project if ((len = in.read(buf)) > 0) { 207adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project inf.setInput(buf, 0, len); 208adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 209adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 210f7c6911047d63bc76292f55ce538da32818dd931Jesse Wilson // END android-only 211adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 212adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 213adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 2143541c79d5058b86e742867b4ee5811a1de01de1fJesse Wilson * Skips up to {@code byteCount} bytes of uncompressed data. 21557995e8186b54515d5a03bf2ab104c3dc247f1b6Jesse Wilson * 2163541c79d5058b86e742867b4ee5811a1de01de1fJesse Wilson * @param byteCount the number of bytes to skip. 217adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @return the number of uncompressed bytes skipped. 218f9480f317cddcec859025833b748f096247a40aaElliott Hughes * @throws IllegalArgumentException if {@code byteCount < 0}. 2193541c79d5058b86e742867b4ee5811a1de01de1fJesse Wilson * @throws IOException if an error occurs skipping. 220adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 221adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project @Override 2223541c79d5058b86e742867b4ee5811a1de01de1fJesse Wilson public long skip(long byteCount) throws IOException { 223f9480f317cddcec859025833b748f096247a40aaElliott Hughes if (byteCount < 0) { 224f9480f317cddcec859025833b748f096247a40aaElliott Hughes throw new IllegalArgumentException("byteCount < 0"); 225f9480f317cddcec859025833b748f096247a40aaElliott Hughes } 2263541c79d5058b86e742867b4ee5811a1de01de1fJesse Wilson return Streams.skipByReading(this, byteCount); 227adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 228adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 229adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 2300146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson * Returns 0 when when this stream has exhausted its input; and 1 otherwise. 2310146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson * A result of 1 does not guarantee that further bytes can be returned, 2320146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson * with or without blocking. 2330146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson * 2340146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson * <p>Although consistent with the RI, this behavior is inconsistent with 2350146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson * {@link InputStream#available()}, and violates the <a 2360146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson * href="http://en.wikipedia.org/wiki/Liskov_substitution_principle">Liskov 2370146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson * Substitution Principle</a>. This method should not be used. 23857995e8186b54515d5a03bf2ab104c3dc247f1b6Jesse Wilson * 2390146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson * @return 0 if no further bytes are available. Otherwise returns 1, 2400146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson * which suggests (but does not guarantee) that additional bytes are 2410146d778677790cf6aee98fbb8a5e7d24eb023a4Jesse Wilson * available. 242582d926fbf5f5fd4800def67f86ecfedee44681eElliott Hughes * @throws IOException if this stream is closed or an error occurs 243adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 244adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project @Override 245adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project public int available() throws IOException { 24660eb73fc9f0636c3d0bda5baba641a5f88f8476fElliott Hughes checkClosed(); 247adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project if (eof) { 248adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project return 0; 249adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 250adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project return 1; 251adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 252adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 253adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 254adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * Closes the input stream. 25557995e8186b54515d5a03bf2ab104c3dc247f1b6Jesse Wilson * 256adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @throws IOException 257adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * If an error occurs closing the input stream. 258adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 259adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project @Override 260adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project public void close() throws IOException { 261adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project if (!closed) { 262adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project inf.end(); 263adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project closed = true; 264adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project eof = true; 265adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project super.close(); 266adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 267adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 26857995e8186b54515d5a03bf2ab104c3dc247f1b6Jesse Wilson 269adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 27057995e8186b54515d5a03bf2ab104c3dc247f1b6Jesse Wilson * Marks the current position in the stream. This implementation overrides 27157995e8186b54515d5a03bf2ab104c3dc247f1b6Jesse Wilson * the super type implementation to do nothing at all. 27257995e8186b54515d5a03bf2ab104c3dc247f1b6Jesse Wilson * 273adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @param readlimit 274adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * of no use. 275adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 276adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project @Override 277adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project public void mark(int readlimit) { 278adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project // do nothing 279adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 280adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 281adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 282adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * Reset the position of the stream to the last marked position. This 283adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * implementation overrides the supertype implementation and always throws 284adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * an {@link IOException IOException} when called. 28557995e8186b54515d5a03bf2ab104c3dc247f1b6Jesse Wilson * 286adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @throws IOException 287adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * if the method is called 288adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 289adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project @Override 29057995e8186b54515d5a03bf2ab104c3dc247f1b6Jesse Wilson public void reset() throws IOException { 291adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project throw new IOException(); 292adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 29357995e8186b54515d5a03bf2ab104c3dc247f1b6Jesse Wilson 294adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project /** 295adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * Returns whether the receiver implements {@code mark} semantics. This type 296adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * does not support {@code mark()}, so always responds {@code false}. 29757995e8186b54515d5a03bf2ab104c3dc247f1b6Jesse Wilson * 298adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project * @return false, always 299adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project */ 300adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project @Override 301adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project public boolean markSupported() { 302adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project return false; 303adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project } 304adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project 30560eb73fc9f0636c3d0bda5baba641a5f88f8476fElliott Hughes private void checkClosed() throws IOException { 30660eb73fc9f0636c3d0bda5baba641a5f88f8476fElliott Hughes if (closed) { 30760eb73fc9f0636c3d0bda5baba641a5f88f8476fElliott Hughes throw new IOException("Stream is closed"); 30860eb73fc9f0636c3d0bda5baba641a5f88f8476fElliott Hughes } 30960eb73fc9f0636c3d0bda5baba641a5f88f8476fElliott Hughes } 310adc854b798c1cfe3bfd4c27d68d5cee38ca617daThe Android Open Source Project} 311