--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/java.base/share/classes/java/util/zip/InflaterInputStream.java Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,293 @@
+/*
+ * 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
+ * @since 1.1
+ */
+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 <code>len</code> is not
+ * zero, the method will block until some input can be decompressed; otherwise,
+ * no bytes are read and <code>0</code> is returned.
+ * @param b the buffer into which the data is read
+ * @param off the start offset in the destination array <code>b</code>
+ * @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 <code>b</code> is <code>null</code>.
+ * @exception IndexOutOfBoundsException If <code>off</code> is negative,
+ * <code>len</code> is negative, or <code>len</code> is greater than
+ * <code>b.length - off</code>
+ * @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.
+ * <p>
+ * 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 if (inf.finished()) {
+ // the end of the compressed data stream has been reached
+ reachEOF = true;
+ 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 <code>mark</code> and
+ * <code>reset</code> methods. The <code>markSupported</code>
+ * method of <code>InflaterInputStream</code> returns
+ * <code>false</code>.
+ *
+ * @return a <code>boolean</code> indicating if this stream type supports
+ * the <code>mark</code> and <code>reset</code> 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.
+ *
+ * <p> The <code>mark</code> method of <code>InflaterInputStream</code>
+ * 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
+ * <code>mark</code> method was last called on this input stream.
+ *
+ * <p> The method <code>reset</code> for class
+ * <code>InflaterInputStream</code> does nothing except throw an
+ * <code>IOException</code>.
+ *
+ * @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");
+ }
+}