mirror of git://gcc.gnu.org/git/gcc.git
381 lines
9.3 KiB
Java
381 lines
9.3 KiB
Java
/* ZipInputStream.java --
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Copyright (C) 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.util.zip;
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import java.io.EOFException;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.UnsupportedEncodingException;
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/**
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* This is a FilterInputStream that reads the files in an zip archive
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* one after another. It has a special method to get the zip entry of
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* the next file. The zip entry contains information about the file name
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* size, compressed size, CRC, etc.
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*
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* It includes support for STORED and DEFLATED entries.
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*
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* @author Jochen Hoenicke
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*/
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public class ZipInputStream extends InflaterInputStream implements ZipConstants
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{
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private CRC32 crc = new CRC32();
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private ZipEntry entry = null;
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private int csize;
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private int size;
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private int method;
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private int flags;
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private int avail;
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private boolean entryAtEOF;
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/**
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* Creates a new Zip input stream, reading a zip archive.
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*/
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public ZipInputStream(InputStream in)
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{
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super(in, new Inflater(true));
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}
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private void fillBuf() throws IOException
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{
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avail = len = in.read(buf, 0, buf.length);
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}
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private int readBuf(byte[] out, int offset, int length) throws IOException
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{
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if (avail <= 0)
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{
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fillBuf();
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if (avail <= 0)
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return -1;
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}
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if (length > avail)
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length = avail;
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System.arraycopy(buf, len - avail, out, offset, length);
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avail -= length;
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return length;
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}
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private void readFully(byte[] out) throws IOException
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{
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int off = 0;
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int len = out.length;
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while (len > 0)
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{
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int count = readBuf(out, off, len);
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if (count == -1)
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throw new EOFException();
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off += count;
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len -= count;
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}
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}
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private int readLeByte() throws IOException
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{
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if (avail <= 0)
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{
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fillBuf();
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if (avail <= 0)
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throw new ZipException("EOF in header");
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}
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return buf[len - avail--] & 0xff;
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}
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/**
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* Read an unsigned short in little endian byte order.
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*/
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private int readLeShort() throws IOException
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{
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return readLeByte() | (readLeByte() << 8);
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}
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/**
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* Read an int in little endian byte order.
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*/
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private int readLeInt() throws IOException
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{
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return readLeShort() | (readLeShort() << 16);
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}
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/**
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* Open the next entry from the zip archive, and return its description.
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* If the previous entry wasn't closed, this method will close it.
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*/
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public ZipEntry getNextEntry() throws IOException
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{
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if (crc == null)
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throw new IOException("Stream closed.");
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if (entry != null)
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closeEntry();
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int header = readLeInt();
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if (header == CENSIG)
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{
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/* Central Header reached. */
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close();
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return null;
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}
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if (header != LOCSIG)
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throw new ZipException("Wrong Local header signature: "
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+ Integer.toHexString(header));
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/* skip version */
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readLeShort();
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flags = readLeShort();
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method = readLeShort();
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int dostime = readLeInt();
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int crc = readLeInt();
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csize = readLeInt();
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size = readLeInt();
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int nameLen = readLeShort();
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int extraLen = readLeShort();
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if (method == ZipOutputStream.STORED && csize != size)
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throw new ZipException("Stored, but compressed != uncompressed");
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byte[] buffer = new byte[nameLen];
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readFully(buffer);
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String name;
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try
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{
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name = new String(buffer, "UTF-8");
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}
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catch (UnsupportedEncodingException uee)
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{
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throw new AssertionError(uee);
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}
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entry = createZipEntry(name);
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entryAtEOF = false;
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entry.setMethod(method);
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if ((flags & 8) == 0)
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{
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entry.setCrc(crc & 0xffffffffL);
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entry.setSize(size & 0xffffffffL);
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entry.setCompressedSize(csize & 0xffffffffL);
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}
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entry.setDOSTime(dostime);
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if (extraLen > 0)
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{
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byte[] extra = new byte[extraLen];
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readFully(extra);
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entry.setExtra(extra);
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}
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if (method == ZipOutputStream.DEFLATED && avail > 0)
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{
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System.arraycopy(buf, len - avail, buf, 0, avail);
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len = avail;
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avail = 0;
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inf.setInput(buf, 0, len);
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}
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return entry;
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}
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private void readDataDescr() throws IOException
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{
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if (readLeInt() != EXTSIG)
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throw new ZipException("Data descriptor signature not found");
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entry.setCrc(readLeInt() & 0xffffffffL);
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csize = readLeInt();
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size = readLeInt();
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entry.setSize(size & 0xffffffffL);
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entry.setCompressedSize(csize & 0xffffffffL);
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}
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/**
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* Closes the current zip entry and moves to the next one.
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*/
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public void closeEntry() throws IOException
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{
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if (crc == null)
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throw new IOException("Stream closed.");
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if (entry == null)
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return;
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if (method == ZipOutputStream.DEFLATED)
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{
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if ((flags & 8) != 0)
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{
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/* We don't know how much we must skip, read until end. */
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byte[] tmp = new byte[2048];
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while (read(tmp) > 0)
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;
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/* read will close this entry */
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return;
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}
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csize -= inf.getTotalIn();
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avail = inf.getRemaining();
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}
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if (avail > csize && csize >= 0)
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avail -= csize;
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else
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{
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csize -= avail;
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avail = 0;
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while (csize != 0)
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{
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long skipped = in.skip(csize & 0xffffffffL);
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if (skipped <= 0)
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throw new ZipException("zip archive ends early.");
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csize -= skipped;
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}
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}
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size = 0;
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crc.reset();
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if (method == ZipOutputStream.DEFLATED)
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inf.reset();
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entry = null;
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entryAtEOF = true;
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}
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public int available() throws IOException
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{
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return entryAtEOF ? 0 : 1;
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}
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/**
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* Reads a byte from the current zip entry.
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* @return the byte or -1 on EOF.
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* @exception IOException if a i/o error occured.
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* @exception ZipException if the deflated stream is corrupted.
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*/
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public int read() throws IOException
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{
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byte[] b = new byte[1];
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if (read(b, 0, 1) <= 0)
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return -1;
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return b[0] & 0xff;
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}
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/**
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* Reads a block of bytes from the current zip entry.
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* @return the number of bytes read (may be smaller, even before
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* EOF), or -1 on EOF.
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* @exception IOException if a i/o error occured.
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* @exception ZipException if the deflated stream is corrupted.
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*/
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public int read(byte[] b, int off, int len) throws IOException
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{
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if (len == 0)
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return 0;
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if (crc == null)
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throw new IOException("Stream closed.");
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if (entry == null)
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return -1;
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boolean finished = false;
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switch (method)
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{
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case ZipOutputStream.DEFLATED:
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len = super.read(b, off, len);
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if (len < 0)
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{
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if (!inf.finished())
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throw new ZipException("Inflater not finished!?");
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avail = inf.getRemaining();
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if ((flags & 8) != 0)
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readDataDescr();
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if (inf.getTotalIn() != csize
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|| inf.getTotalOut() != size)
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throw new ZipException("size mismatch: "+csize+";"+size+" <-> "+inf.getTotalIn()+";"+inf.getTotalOut());
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inf.reset();
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finished = true;
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}
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break;
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case ZipOutputStream.STORED:
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if (len > csize && csize >= 0)
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len = csize;
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len = readBuf(b, off, len);
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if (len > 0)
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{
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csize -= len;
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size -= len;
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}
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if (csize == 0)
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finished = true;
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else if (len < 0)
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throw new ZipException("EOF in stored block");
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break;
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}
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if (len > 0)
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crc.update(b, off, len);
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if (finished)
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{
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if ((crc.getValue() & 0xffffffffL) != entry.getCrc())
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throw new ZipException("CRC mismatch");
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crc.reset();
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entry = null;
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entryAtEOF = true;
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}
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return len;
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}
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/**
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* Closes the zip file.
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* @exception IOException if a i/o error occured.
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*/
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public void close() throws IOException
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{
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super.close();
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crc = null;
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entry = null;
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entryAtEOF = true;
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}
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/**
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* Creates a new zip entry for the given name. This is equivalent
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* to new ZipEntry(name).
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* @param name the name of the zip entry.
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*/
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protected ZipEntry createZipEntry(String name)
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{
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return new ZipEntry(name);
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}
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}
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