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// ZipFile.java - Read contents of a ZIP file.
/* Copyright (C) 1999 Cygnus Solutions
This file is part of libgcj.
This software is copyrighted work licensed under the terms of the
Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
details. */
package java.util.zip;
import java.io.*;
/* Written using on-line Java Platform 1.2 API Specification
* and JCL book.
* Believed complete and correct.
*/
public class ZipFile implements ZipConstants
{
public ZipFile (String fname) throws IOException
{
file = new RandomAccessFile(fname, "r");
name = fname;
readDirectory ();
}
public ZipFile (File f) throws IOException
{
file = new RandomAccessFile(f, "r");
name = f.getName();
readDirectory ();
}
void readDirectory () throws IOException
{
long size = file.length ();
if (size < ZipConstants.END_CENTRAL_DIR_SIZE)
throw new ZipException ("zipfile too short");
// We do not handle a "zipfile comment", which the appnote says can
// be at the end of a .zip file. We could handle this by seeking
// to the beginning and reading forwards.
file.seek(size - ZipConstants.END_CENTRAL_DIR_SIZE);
if (file.read() != 'P'
|| file.read() != 'K'
|| file.read() != '\005'
|| file.read() != '\006')
throw new ZipException("not a valid zipfile");
file.skipBytes(6);
numEntries = readu2();
int dir_size = read4 (); // Read "size of the central directory".
file.seek(size - (dir_size + ZipConstants.END_CENTRAL_DIR_SIZE));
ZipEntry last = null;
for (int i = 0; i < numEntries; i++)
{
file.skipBytes(10);
int method = readu2();
int modtime = readu2();
int moddate = readu2();
int crc = read4();
int compressedSize = read4();
int uncompressedSize = read4();
int filenameLength = readu2();
int extraLength = readu2();
int commentLength = readu2();
int diskNumberStart = readu2();
int intAttributes = readu2();
int extAttributes = read4();
int relativeOffset = read4();
byte[] bname = new byte[filenameLength];
file.readFully(bname);
ZipEntry entry = new ZipEntry(new String(bname, "8859_1"));
if (extraLength > 0)
{
byte[] bextra = new byte[extraLength];
file.readFully(bextra);
entry.extra = bextra;
}
if (commentLength > 0)
{
byte[] bcomment = new byte[commentLength];
file.readFully(bcomment);
entry.comment = new String(bcomment, "8859_1");
}
entry.compressedSize = compressedSize;
entry.size = uncompressedSize;
entry.crc = (long) crc & 0xffffffffL;
entry.method = method;
entry.relativeOffset = relativeOffset;
entry.time = ZipEntry.timeFromDOS(moddate, modtime);
if (last == null)
entries = entry;
else
last.next = entry;
last = entry;
}
}
public java.util.Enumeration entries()
{
return new ZipEnumeration(this);
}
public void close() throws IOException
{
file.close();
entries = null;
numEntries = 0;
}
public ZipEntry getEntry(String name)
{
for (ZipEntry entry = entries; entry != null; entry = entry.next)
{
if (name.equals(entry.getName()))
return entry;
}
return null;
}
public InputStream getInputStream(ZipEntry ze) throws IOException
{
byte[] buffer = new byte[(int) ze.getSize()];
/* Read the size of the extra field, and skip to the start of the
data. */
file.seek (ze.relativeOffset + ZipConstants.LOCAL_FILE_HEADER_SIZE - 2);
int extraFieldLength = readu2();
file.skipBytes (ze.getName().length() + extraFieldLength);
file.readFully(buffer);
InputStream is = new ByteArrayInputStream (buffer);
if (ze.getMethod() == ZipEntry.DEFLATED)
is = new InflaterInputStream (is);
return is;
}
public String getName () { return name; }
private int readu2 () throws IOException
{
int byte0 = file.read();
int byte1 = file.read();
if (byte0 < 0 || byte1 < 0)
throw new ZipException (".zip archive ended prematurely");
return ((byte1 & 0xFF) << 8) | (byte0 & 0xFF);
}
private int read4 () throws IOException
{
int byte0 = file.read();
int byte1 = file.read();
int byte2 = file.read();
int byte3 = file.read();
if (byte3 < 0)
throw new ZipException (".zip archive ended prematurely");
return ((byte3 & 0xFF) << 24) + ((byte2 & 0xFF) << 16)
+ ((byte1 & 0xFF) << 8) + (byte0 & 0xFF);
}
ZipEntry entries;
int numEntries;
RandomAccessFile file;
String name;
}
class ZipEnumeration implements java.util.Enumeration
{
ZipEntry entry;
ZipEnumeration (ZipFile zfile)
{
entry = zfile.entries;
}
public boolean hasMoreElements ()
{
return entry != null;
}
public Object nextElement ()
{
ZipEntry cur = entry;
if (cur == null)
throw new java.util.NoSuchElementException();
entry = cur.next;
return cur;
}
}
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