Unless otherwise noted, passing a null argument to a constructor * or method in this class will cause a {@link NullPointerException} to be * thrown. * * @author David Connelly */ public class ZipFile implements ZipConstants, Closeable { private long jzfile; // address of jzfile data private String name; // zip file name private int total; // total number of entries private boolean closeRequested; private static final int STORED = ZipEntry.STORED; private static final int DEFLATED = ZipEntry.DEFLATED; /** * Mode flag to open a zip file for reading. */ public static final int OPEN_READ = 0x1; /** * Mode flag to open a zip file and mark it for deletion. The file will be * deleted some time between the moment that it is opened and the moment * that it is closed, but its contents will remain accessible via the * ZipFile object until either the close method is invoked or the * virtual machine exits. */ public static final int OPEN_DELETE = 0x4; static { /* Zip library is loaded from System.initializeSystemClass */ initIDs(); } private static native void initIDs(); private static final boolean usemmap; static { // A system prpperty to disable mmap use to avoid vm crash when // in-use zip file is accidently overwritten by others. String prop = sun.misc.VM.getSavedProperty("sun.zip.disableMemoryMapping"); usemmap = (prop == null || !(prop.length() == 0 || prop.equalsIgnoreCase("true"))); } /** * Opens a zip file for reading. * *
First, if there is a security manager, its checkRead
* method is called with the name argument as its argument
* to ensure the read is allowed.
*
*
The UTF-8 {@link java.nio.charset.Charset charset} is used to
* decode the entry names and comments.
*
* @param name the name of the zip file
* @throws ZipException if a ZIP format error has occurred
* @throws IOException if an I/O error has occurred
* @throws SecurityException if a security manager exists and its
* checkRead method doesn't allow read access to the file.
*
* @see SecurityManager#checkRead(java.lang.String)
*/
public ZipFile(String name) throws IOException {
this(new File(name), OPEN_READ);
}
/**
* Opens a new ZipFile to read from the specified
* File object in the specified mode. The mode argument
* must be either OPEN_READ or OPEN_READ | OPEN_DELETE.
*
*
First, if there is a security manager, its checkRead
* method is called with the name argument as its argument to
* ensure the read is allowed.
*
*
The UTF-8 {@link java.nio.charset.Charset charset} is used to
* decode the entry names and comments
*
* @param file the ZIP file to be opened for reading
* @param mode the mode in which the file is to be opened
* @throws ZipException if a ZIP format error has occurred
* @throws IOException if an I/O error has occurred
* @throws SecurityException if a security manager exists and
* its checkRead method
* doesn't allow read access to the file,
* or its checkDelete method doesn't allow deleting
* the file when the OPEN_DELETE flag is set.
* @throws IllegalArgumentException if the mode argument is invalid
* @see SecurityManager#checkRead(java.lang.String)
* @since 1.3
*/
public ZipFile(File file, int mode) throws IOException {
this(file, mode, Charset.forName("UTF-8"));
}
/**
* Opens a ZIP file for reading given the specified File object.
*
*
The UTF-8 {@link java.nio.charset.Charset charset} is used to
* decode the entry names and comments.
*
* @param file the ZIP file to be opened for reading
* @throws ZipException if a ZIP format error has occurred
* @throws IOException if an I/O error has occurred
*/
public ZipFile(File file) throws ZipException, IOException {
this(file, OPEN_READ);
}
private ZipCoder zc;
/**
* Opens a new ZipFile to read from the specified
* File object in the specified mode. The mode argument
* must be either OPEN_READ or OPEN_READ | OPEN_DELETE.
*
*
First, if there is a security manager, its checkRead
* method is called with the name argument as its argument to
* ensure the read is allowed.
*
* @param file the ZIP file to be opened for reading
* @param mode the mode in which the file is to be opened
* @param charset
* the {@linkplain java.nio.charset.Charset charset} to
* be used to decode the ZIP entry name and comment that are not
* encoded by using UTF-8 encoding (indicated by entry's general
* purpose flag).
*
* @throws ZipException if a ZIP format error has occurred
* @throws IOException if an I/O error has occurred
*
* @throws SecurityException
* if a security manager exists and its checkRead
* method doesn't allow read access to the file,or its
* checkDelete method doesn't allow deleting the
* file when the OPEN_DELETE flag is set
*
* @throws IllegalArgumentException if the mode argument is invalid
*
* @see SecurityManager#checkRead(java.lang.String)
*
* @since 1.7
*/
public ZipFile(File file, int mode, Charset charset) throws IOException
{
if (((mode & OPEN_READ) == 0) ||
((mode & ~(OPEN_READ | OPEN_DELETE)) != 0)) {
throw new IllegalArgumentException("Illegal mode: 0x"+
Integer.toHexString(mode));
}
String name = file.getPath();
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
sm.checkRead(name);
if ((mode & OPEN_DELETE) != 0) {
sm.checkDelete(name);
}
}
if (charset == null)
throw new NullPointerException("charset is null");
this.zc = ZipCoder.get(charset);
long t0 = System.nanoTime();
jzfile = open(name, mode, file.lastModified(), usemmap);
sun.misc.PerfCounter.getZipFileOpenTime().addElapsedTimeFrom(t0);
sun.misc.PerfCounter.getZipFileCount().increment();
this.name = name;
this.total = getTotal(jzfile);
}
/**
* Opens a zip file for reading.
*
*
First, if there is a security manager, its Closing this ZIP file will, in turn, close all input
* streams that have been returned by invocations of this method.
*
* @param entry the zip file entry
* @return the input stream for reading the contents of the specified
* zip file entry.
* @throws ZipException if a ZIP format error has occurred
* @throws IOException if an I/O error has occurred
* @throws IllegalStateException if the zip file has been closed
*/
public InputStream getInputStream(ZipEntry entry) throws IOException {
if (entry == null) {
throw new NullPointerException("entry");
}
long jzentry = 0;
ZipFileInputStream in = null;
synchronized (this) {
ensureOpen();
if (!zc.isUTF8() && (entry.flag & EFS) != 0) {
jzentry = getEntry(jzfile, zc.getBytesUTF8(entry.name), false);
} else {
jzentry = getEntry(jzfile, zc.getBytes(entry.name), false);
}
if (jzentry == 0) {
return null;
}
in = new ZipFileInputStream(jzentry);
switch (getEntryMethod(jzentry)) {
case STORED:
streams.add(in);
return in;
case DEFLATED:
final ZipFileInputStream zfin = in;
// MORE: Compute good size for inflater stream:
long size = getEntrySize(jzentry) + 2; // Inflater likes a bit of slack
if (size > 65536) size = 8192;
if (size <= 0) size = 4096;
InputStream is = new InflaterInputStream(zfin, getInflater(), (int)size) {
private boolean isClosed = false;
public void close() throws IOException {
if (!isClosed) {
super.close();
releaseInflater(inf);
isClosed = true;
}
}
// Override fill() method to provide an extra "dummy" byte
// at the end of the input stream. This is required when
// using the "nowrap" Inflater option.
protected void fill() throws IOException {
if (eof) {
throw new EOFException(
"Unexpected end of ZLIB input stream");
}
len = this.in.read(buf, 0, buf.length);
if (len == -1) {
buf[0] = 0;
len = 1;
eof = true;
}
inf.setInput(buf, 0, len);
}
private boolean eof;
public int available() throws IOException {
if (isClosed)
return 0;
long avail = zfin.size() - inf.getBytesWritten();
return avail > (long) Integer.MAX_VALUE ?
Integer.MAX_VALUE : (int) avail;
}
};
streams.add(is);
return is;
default:
throw new ZipException("invalid compression method");
}
}
}
/*
* Gets an inflater from the list of available inflaters or allocates
* a new one.
*/
private Inflater getInflater() {
synchronized (inflaters) {
int size = inflaters.size();
if (size > 0) {
Inflater inf = (Inflater)inflaters.remove(size - 1);
return inf;
} else {
return new Inflater(true);
}
}
}
/*
* Releases the specified inflater to the list of available inflaters.
*/
private void releaseInflater(Inflater inf) {
synchronized (inflaters) {
inf.reset();
inflaters.add(inf);
}
}
// List of available Inflater objects for decompression
private Vector inflaters = new Vector();
/**
* Returns the path name of the ZIP file.
* @return the path name of the ZIP file
*/
public String getName() {
return name;
}
/**
* Returns an enumeration of the ZIP file entries.
* @return an enumeration of the ZIP file entries
* @throws IllegalStateException if the zip file has been closed
*/
public Enumeration entries() {
ensureOpen();
return new Enumeration Closing this ZIP file will close all of the input streams
* previously returned by invocations of the {@link #getInputStream
* getInputStream} method.
*
* @throws IOException if an I/O error has occurred
*/
public void close() throws IOException {
synchronized (this) {
closeRequested = true;
if (streams.size() !=0) {
Set
* Since the time when GC would invoke this method is undetermined,
* it is strongly recommended that applications invoke the checkRead
* method is called with the name argument as its argument
* to ensure the read is allowed.
*
* @param name the name of the zip file
* @param charset
* the {@linkplain java.nio.charset.Charset charset} to
* be used to decode the ZIP entry name and comment that are not
* encoded by using UTF-8 encoding (indicated by entry's general
* purpose flag).
*
* @throws ZipException if a ZIP format error has occurred
* @throws IOException if an I/O error has occurred
* @throws SecurityException
* if a security manager exists and its checkRead
* method doesn't allow read access to the file
*
* @see SecurityManager#checkRead(java.lang.String)
*
* @since 1.7
*/
public ZipFile(String name, Charset charset) throws IOException
{
this(new File(name), OPEN_READ, charset);
}
/**
* Opens a ZIP file for reading given the specified File object.
* @param file the ZIP file to be opened for reading
* @param charset
* The {@linkplain java.nio.charset.Charset charset} to be
* used to decode the ZIP entry name and comment (ignored if
* the language
* encoding bit of the ZIP entry's general purpose bit
* flag is set).
*
* @throws ZipException if a ZIP format error has occurred
* @throws IOException if an I/O error has occurred
*
* @since 1.7
*/
public ZipFile(File file, Charset charset) throws IOException
{
this(file, OPEN_READ, charset);
}
/**
* Returns the zip file comment, or null if none.
*
* @return the comment string for the zip file, or null if none
*
* @throws IllegalStateException if the zip file has been closed
*
* Since 1.7
*/
public String getComment() {
synchronized (this) {
ensureOpen();
byte[] bcomm = getCommentBytes(jzfile);
if (bcomm == null)
return null;
return zc.toString(bcomm, bcomm.length);
}
}
/**
* Returns the zip file entry for the specified name, or null
* if not found.
*
* @param name the name of the entry
* @return the zip file entry, or null if not found
* @throws IllegalStateException if the zip file has been closed
*/
public ZipEntry getEntry(String name) {
if (name == null) {
throw new NullPointerException("name");
}
long jzentry = 0;
synchronized (this) {
ensureOpen();
jzentry = getEntry(jzfile, zc.getBytes(name), true);
if (jzentry != 0) {
ZipEntry ze = getZipEntry(name, jzentry);
freeEntry(jzfile, jzentry);
return ze;
}
}
return null;
}
private static native long getEntry(long jzfile, byte[] name,
boolean addSlash);
// freeEntry releases the C jzentry struct.
private static native void freeEntry(long jzfile, long jzentry);
// the outstanding inputstreams that need to be closed.
private Setclose method of this ZIP file is
* called when there are no more references to it.
*
* close
* method as soon they have finished accessing this ZipFile.
* This will prevent holding up system resources for an undetermined
* length of time.
*
* @throws IOException if an I/O error has occurred
* @see java.util.zip.ZipFile#close()
*/
protected void finalize() throws IOException {
close();
}
private static native void close(long jzfile);
private void ensureOpen() {
if (closeRequested) {
throw new IllegalStateException("zip file closed");
}
if (jzfile == 0) {
throw new IllegalStateException("The object is not initialized.");
}
}
private void ensureOpenOrZipException() throws IOException {
if (closeRequested) {
throw new ZipException("ZipFile closed");
}
}
/*
* Inner class implementing the input stream used to read a
* (possibly compressed) zip file entry.
*/
private class ZipFileInputStream extends InputStream {
protected long jzentry; // address of jzentry data
private long pos; // current position within entry data
protected long rem; // number of remaining bytes within entry
protected long size; // uncompressed size of this entry
ZipFileInputStream(long jzentry) {
pos = 0;
rem = getEntryCSize(jzentry);
size = getEntrySize(jzentry);
this.jzentry = jzentry;
}
public int read(byte b[], int off, int len) throws IOException {
if (rem == 0) {
return -1;
}
if (len <= 0) {
return 0;
}
if (len > rem) {
len = (int) rem;
}
synchronized (ZipFile.this) {
ensureOpenOrZipException();
len = ZipFile.read(ZipFile.this.jzfile, jzentry, pos, b,
off, len);
}
if (len > 0) {
pos += len;
rem -= len;
}
if (rem == 0) {
close();
}
return len;
}
public int read() throws IOException {
byte[] b = new byte[1];
if (read(b, 0, 1) == 1) {
return b[0] & 0xff;
} else {
return -1;
}
}
public long skip(long n) {
if (n > rem)
n = rem;
pos += n;
rem -= n;
if (rem == 0) {
close();
}
return n;
}
public int available() {
return rem > Integer.MAX_VALUE ? Integer.MAX_VALUE : (int) rem;
}
public long size() {
return size;
}
public void close() {
rem = 0;
synchronized (ZipFile.this) {
if (jzentry != 0 && ZipFile.this.jzfile != 0) {
freeEntry(ZipFile.this.jzfile, jzentry);
jzentry = 0;
}
streams.remove(this);
}
}
}
private static native long open(String name, int mode, long lastModified,
boolean usemmap) throws IOException;
private static native int getTotal(long jzfile);
private static native int read(long jzfile, long jzentry,
long pos, byte[] b, int off, int len);
// access to the native zentry object
private static native long getEntryTime(long jzentry);
private static native long getEntryCrc(long jzentry);
private static native long getEntryCSize(long jzentry);
private static native long getEntrySize(long jzentry);
private static native int getEntryMethod(long jzentry);
private static native int getEntryFlag(long jzentry);
private static native byte[] getCommentBytes(long jzfile);
private static final int JZENTRY_NAME = 0;
private static final int JZENTRY_EXTRA = 1;
private static final int JZENTRY_COMMENT = 2;
private static native byte[] getEntryBytes(long jzentry, int type);
private static native String getZipMessage(long jzfile);
}