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284 lines
7.5 KiB
Java
284 lines
7.5 KiB
Java
/* ZipInputStream.java - Input filter for reading zip file
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Copyright (C) 1999, 2000 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., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA.
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As a special exception, if you link this library with other files to
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produce an executable, this library does not by itself cause the
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resulting executable to be covered by the GNU General Public License.
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This exception does not however invalidate any other reasons why the
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executable file might be covered by the GNU General Public License. */
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package java.util.zip;
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import java.io.*;
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/**
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* @author Per Bothner
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* @date May 1999.
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*/
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/*
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* Written using on-line Java Platform 1.2 API Specification, as well
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* as "The Java Class Libraries", 2nd edition (Addison-Wesley, 1998).
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* Status: Quite incomplete, but can read uncompressed .zip archives.
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*/
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// We do not calculate the CRC and compare it with the specified value;
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// we probably should. FIXME.
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public class ZipInputStream extends InflaterInputStream implements ZipConstants
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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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public ZipEntry getNextEntry () throws IOException
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{
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if (closed)
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throw new IOException ("stream closed");
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if (current != null)
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closeEntry();
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if (in.read() != 'P'
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|| in.read() != 'K')
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return null;
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int code = in.read();
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while (code == '\001')
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{
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code = in.read();
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if (code != '\002')
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return null;
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in.skip(16);
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int size = read4();
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in.skip(4);
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int fname_length = readu2();
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int extra_length = readu2();
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int fcomment_length = readu2();
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// `12' is the number of bytes between the comment length
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// field and the end of the fixed part of the header:
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// 2 bytes for `disk number start'
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// 2 bytes for `internal file attributes'
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// 4 bytes for `external file attributes'
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// 4 bytes for `relative offset of local header'
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in.skip(12 + fname_length + extra_length + fcomment_length);
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if (in.read() != 'P' || in.read() != 'K')
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return null;
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code = in.read();
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}
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if (code == '\005')
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{
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if (in.read() != '\006')
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return null;
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in.skip(16);
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int comment_size = readu2();
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in.skip(comment_size);
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if (in.read() != 'P' || in.read() != 'K')
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return null;
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code = in.read();
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}
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if (code != '\003'
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|| in.read() != '\004')
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return null;
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int ex_version = readu2();
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current_flags = readu2();
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int method = readu2();
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int modtime = readu2();
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int moddate = readu2();
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int crc = read4();
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int compressedSize = read4();
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int uncompressedSize = read4();
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int filenameLength = readu2();
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int extraLength = readu2();
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byte[] bname = new byte[filenameLength];
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readFully(bname);
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ZipEntry entry = createZipEntry(new String(bname, "8859_1"));
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if (extraLength > 0)
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{
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byte[] bextra = new byte[extraLength];
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readFully(bextra);
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entry.extra = bextra;
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}
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entry.compressedSize = compressedSize;
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entry.size = uncompressedSize;
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entry.crc = (long) crc & 0xffffffffL;
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entry.method = method;
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entry.time = ZipEntry.timeFromDOS(moddate, modtime);
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current = entry;
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avail = uncompressedSize;
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compressed_bytes = compressedSize;
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return entry;
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}
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// We override fill to let us control how much data gets read from
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// the underlying input stream. This lets us avoid having to push
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// back data.
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protected void fill () throws IOException
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{
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if (closed)
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throw new IOException ("stream closed");
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int count = buf.length;
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if (count > compressed_bytes)
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count = compressed_bytes;
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len = in.read(buf, 0, count);
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if (len != -1)
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{
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compressed_bytes -= len;
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inf.setInput(buf, 0, len);
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}
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}
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/**
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* Creates a new ZipEntry with the given name.
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* Used by ZipInputStream when normally <code>new ZipEntry (name)</code>
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* would be called. This gives subclasses such as JarInputStream a change
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* to override this method and add aditional information to the ZipEntry
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* (subclass).
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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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public int read (byte[] b, int off, int len) throws IOException
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{
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if (closed)
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throw new IOException ("stream closed");
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if (len > avail)
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len = avail;
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int count;
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if (current.method == Deflater.DEFLATED)
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count = super.read(b, off, len);
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else
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count = in.read(b, off, len);
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if (count == -1 || avail == 0)
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{
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inf.reset();
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count = -1;
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}
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else
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avail -= count;
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return count;
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}
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public long skip (long n) throws IOException
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{
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if (closed)
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throw new IOException ("stream closed");
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if (n > avail)
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n = avail;
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long count;
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if (current.method == Deflater.DEFLATED)
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count = super.skip(n);
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else
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count = in.skip(n);
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avail = avail - (int) count;
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return count;
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}
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/**
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* Returns 0 if the ZipInputStream is closed and 1 otherwise.
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*
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* @since 1.2
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*/
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public int available()
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{
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return closed ? 0 : 1;
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}
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private void readFully (byte[] b) throws IOException
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{
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int off = 0;
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int len = b.length;
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while (len > 0)
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{
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int count = in.read(b, off, len);
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if (count <= 0)
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throw new EOFException(".zip archive ended prematurely");
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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 readu2 () throws IOException
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{
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int byte0 = in.read();
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int byte1 = in.read();
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if (byte0 < 0 || byte1 < 0)
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throw new EOFException(".zip archive ended prematurely");
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return ((byte1 & 0xFF) << 8) | (byte0 & 0xFF);
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}
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private int read4 () throws IOException
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{
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int byte0 = in.read();
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int byte1 = in.read();
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int byte2 = in.read();
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int byte3 = in.read();
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if (byte3 < 0)
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throw new EOFException(".zip archive ended prematurely");
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return ((byte3 & 0xFF) << 24) + ((byte2 & 0xFF) << 16)
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+ ((byte1 & 0xFF) << 8) + (byte0 & 0xFF);
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}
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public void closeEntry () throws IOException
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{
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if (current != null)
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{
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if (avail > 0)
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skip (avail);
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if ((current_flags & 8) != 0)
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{
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int sig = read4();
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if (sig != 0x04034b50)
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throw new ZipException("bad/missing magic number at end of .zip entry");
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int crc = read4();
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int compressedSize = read4();
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int uncompressedSize = read4();
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if (current.compressedSize != compressedSize
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|| current.size != uncompressedSize
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|| current.crc != crc)
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throw new ZipException("bad data descriptor at end of .zip entry");
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}
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current = null;
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avail = 0;
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}
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}
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/**
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* Closes this InflaterInputStream.
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*
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* @since 1.2
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*/
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public void close () throws IOException
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{
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current = null;
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closed = true;
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super.close();
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}
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private ZipEntry current;
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private int current_flags;
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// Number of uncompressed bytes to be read.
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private int avail;
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// Number of bytes we can read from underlying stream.
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private int compressed_bytes;
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// Is this ZipInputStream closed? Set by the close() method.
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private boolean closed = false;
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}
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