public JarInputStream(InputStream in) throws IOException 
{
        this(in, true);
}

Creates a new JarInputStream and reads the optional manifest. If a manifest is present, also attempts to verify the signatures if the JarInputStream is signed.

Parameters:

in - the actual input stream

Throws:

IOException - if an I/O error has occurred

exception: IOException - if an I/O error has occurred

 public JarInputStream(InputStream in,
    boolean verify) throws IOException 
{
        super(in);
        JarEntry e = (JarEntry)super.getNextEntry();
        if (e != null && e.getName().equalsIgnoreCase("META-INF/"))
            e = (JarEntry)super.getNextEntry();
        if (e != null && JarFile.MANIFEST_NAME.equalsIgnoreCase(e.getName())) {
            man = new Manifest();
            byte bytes[] = getBytes(new BufferedInputStream(this));
            man.read(new ByteArrayInputStream(bytes));
            //man.read(new BufferedInputStream(this));
            closeEntry();
            if (verify) {
                jv = new JarVerifier(bytes);
                mev = new ManifestEntryVerifier(man);
            }
            first = getNextJarEntry();
        } else {
            first = e;
        }
}

Creates a new JarInputStream and reads the optional manifest. If a manifest is present and verify is true, also attempts to verify the signatures if the JarInputStream is signed.

Parameters:

in - the actual input stream

verify - whether or not to verify the JarInputStream if it is signed.

Throws:

IOException - if an I/O error has occurred

exception: IOException - if an I/O error has occurred

 protected ZipEntry createZipEntry(String name) 
{
        JarEntry e = new JarEntry(name);
        if (man != null) {
            e.attr = man.getAttributes(name);
        }
        return e;
}

Creates a new JarEntry (ZipEntry) for the specified JAR file entry name. The manifest attributes of the specified JAR file entry name will be copied to the new JarEntry.

 public Manifest getManifest() 
{
        return man;
}

Returns the Manifest for this JAR file, or null if none.

 public ZipEntry getNextEntry() throws IOException 
{
        JarEntry e;
        if (first == null) {
            e = (JarEntry)super.getNextEntry();
        } else {
            e = first;
            first = null;
        }
        if (jv != null && e != null) {
            // At this point, we might have parsed all the meta-inf
            // entries and have nothing to verify. If we have
            // nothing to verify, get rid of the JarVerifier object.
            if (jv.nothingToVerify() == true) {
                jv = null;
                mev = null;
            } else {
                jv.beginEntry(e, mev);
            }
        }
        return e;
}

Reads the next ZIP file entry and positions the stream at the beginning of the entry data. If verification has been enabled, any invalid signature detected while positioning the stream for the next entry will result in an exception.

 public JarEntry getNextJarEntry() throws IOException 
{
        return (JarEntry)getNextEntry();
}

Reads the next JAR file entry and positions the stream at the beginning of the entry data. If verification has been enabled, any invalid signature detected while positioning the stream for the next entry will result in an exception.

 public int read(byte[] b,
    int off,
    int len) throws IOException 
{
        int n;
        if (first == null) {
            n = super.read(b, off, len);
        } else {
            n = -1;
        }
        if (jv != null) {
            jv.update(n, b, off, len, mev);
        }
        return n;
}

Reads from the current JAR file entry into an array of bytes. If len is not zero, the method blocks until some input is available; otherwise, no bytes are read and 0 is returned. If verification has been enabled, any invalid signature on the current entry will be reported at some point before the end of the entry is reached.