diff -r 836adbf7a2cd -r 3317bb8137f4 jdk/src/java.base/share/classes/java/util/zip/InflaterInputStream.java --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/jdk/src/java.base/share/classes/java/util/zip/InflaterInputStream.java Sun Aug 17 15:54:13 2014 +0100 @@ -0,0 +1,288 @@ +/* + * Copyright (c) 1996, 2013, Oracle and/or its affiliates. All rights reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. Oracle designates this + * particular file as subject to the "Classpath" exception as provided + * by Oracle in the LICENSE file that accompanied this code. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA + * or visit www.oracle.com if you need additional information or have any + * questions. + */ + +package java.util.zip; + +import java.io.FilterInputStream; +import java.io.InputStream; +import java.io.IOException; +import java.io.EOFException; + +/** + * This class implements a stream filter for uncompressing data in the + * "deflate" compression format. It is also used as the basis for other + * decompression filters, such as GZIPInputStream. + * + * @see Inflater + * @author David Connelly + */ +public +class InflaterInputStream extends FilterInputStream { + /** + * Decompressor for this stream. + */ + protected Inflater inf; + + /** + * Input buffer for decompression. + */ + protected byte[] buf; + + /** + * Length of input buffer. + */ + protected int len; + + private boolean closed = false; + // this flag is set to true after EOF has reached + private boolean reachEOF = false; + + /** + * Check to make sure that this stream has not been closed + */ + private void ensureOpen() throws IOException { + if (closed) { + throw new IOException("Stream closed"); + } + } + + + /** + * Creates a new input stream with the specified decompressor and + * buffer size. + * @param in the input stream + * @param inf the decompressor ("inflater") + * @param size the input buffer size + * @exception IllegalArgumentException if {@code size <= 0} + */ + public InflaterInputStream(InputStream in, Inflater inf, int size) { + super(in); + if (in == null || inf == null) { + throw new NullPointerException(); + } else if (size <= 0) { + throw new IllegalArgumentException("buffer size <= 0"); + } + this.inf = inf; + buf = new byte[size]; + } + + /** + * Creates a new input stream with the specified decompressor and a + * default buffer size. + * @param in the input stream + * @param inf the decompressor ("inflater") + */ + public InflaterInputStream(InputStream in, Inflater inf) { + this(in, inf, 512); + } + + boolean usesDefaultInflater = false; + + /** + * Creates a new input stream with a default decompressor and buffer size. + * @param in the input stream + */ + public InflaterInputStream(InputStream in) { + this(in, new Inflater()); + usesDefaultInflater = true; + } + + private byte[] singleByteBuf = new byte[1]; + + /** + * Reads a byte of uncompressed data. This method will block until + * enough input is available for decompression. + * @return the byte read, or -1 if end of compressed input is reached + * @exception IOException if an I/O error has occurred + */ + public int read() throws IOException { + ensureOpen(); + return read(singleByteBuf, 0, 1) == -1 ? -1 : Byte.toUnsignedInt(singleByteBuf[0]); + } + + /** + * Reads uncompressed data into an array of bytes. If len is not + * zero, the method will block until some input can be decompressed; otherwise, + * no bytes are read and 0 is returned. + * @param b the buffer into which the data is read + * @param off the start offset in the destination array b + * @param len the maximum number of bytes read + * @return the actual number of bytes read, or -1 if the end of the + * compressed input is reached or a preset dictionary is needed + * @exception NullPointerException If b is null. + * @exception IndexOutOfBoundsException If off is negative, + * len is negative, or len is greater than + * b.length - off + * @exception ZipException if a ZIP format error has occurred + * @exception IOException if an I/O error has occurred + */ + public int read(byte[] b, int off, int len) throws IOException { + ensureOpen(); + if (b == null) { + throw new NullPointerException(); + } else if (off < 0 || len < 0 || len > b.length - off) { + throw new IndexOutOfBoundsException(); + } else if (len == 0) { + return 0; + } + try { + int n; + while ((n = inf.inflate(b, off, len)) == 0) { + if (inf.finished() || inf.needsDictionary()) { + reachEOF = true; + return -1; + } + if (inf.needsInput()) { + fill(); + } + } + return n; + } catch (DataFormatException e) { + String s = e.getMessage(); + throw new ZipException(s != null ? s : "Invalid ZLIB data format"); + } + } + + /** + * Returns 0 after EOF has been reached, otherwise always return 1. + *

+ * Programs should not count on this method to return the actual number + * of bytes that could be read without blocking. + * + * @return 1 before EOF and 0 after EOF. + * @exception IOException if an I/O error occurs. + * + */ + public int available() throws IOException { + ensureOpen(); + if (reachEOF) { + return 0; + } else { + return 1; + } + } + + private byte[] b = new byte[512]; + + /** + * Skips specified number of bytes of uncompressed data. + * @param n the number of bytes to skip + * @return the actual number of bytes skipped. + * @exception IOException if an I/O error has occurred + * @exception IllegalArgumentException if {@code n < 0} + */ + public long skip(long n) throws IOException { + if (n < 0) { + throw new IllegalArgumentException("negative skip length"); + } + ensureOpen(); + int max = (int)Math.min(n, Integer.MAX_VALUE); + int total = 0; + while (total < max) { + int len = max - total; + if (len > b.length) { + len = b.length; + } + len = read(b, 0, len); + if (len == -1) { + reachEOF = true; + break; + } + total += len; + } + return total; + } + + /** + * Closes this input stream and releases any system resources associated + * with the stream. + * @exception IOException if an I/O error has occurred + */ + public void close() throws IOException { + if (!closed) { + if (usesDefaultInflater) + inf.end(); + in.close(); + closed = true; + } + } + + /** + * Fills input buffer with more data to decompress. + * @exception IOException if an I/O error has occurred + */ + protected void fill() throws IOException { + ensureOpen(); + len = in.read(buf, 0, buf.length); + if (len == -1) { + throw new EOFException("Unexpected end of ZLIB input stream"); + } + inf.setInput(buf, 0, len); + } + + /** + * Tests if this input stream supports the mark and + * reset methods. The markSupported + * method of InflaterInputStream returns + * false. + * + * @return a boolean indicating if this stream type supports + * the mark and reset methods. + * @see java.io.InputStream#mark(int) + * @see java.io.InputStream#reset() + */ + public boolean markSupported() { + return false; + } + + /** + * Marks the current position in this input stream. + * + *

The mark method of InflaterInputStream + * does nothing. + * + * @param readlimit the maximum limit of bytes that can be read before + * the mark position becomes invalid. + * @see java.io.InputStream#reset() + */ + public synchronized void mark(int readlimit) { + } + + /** + * Repositions this stream to the position at the time the + * mark method was last called on this input stream. + * + *

The method reset for class + * InflaterInputStream does nothing except throw an + * IOException. + * + * @exception IOException if this method is invoked. + * @see java.io.InputStream#mark(int) + * @see java.io.IOException + */ + public synchronized void reset() throws IOException { + throw new IOException("mark/reset not supported"); + } +}