File	Doc	Category	Size	Date	Package
JarInputStream.java	API Doc	Java SE 5 API	6473	Fri Aug 26 14:57:26 BST 2005	java.util.jar

JarInputStream

• java.lang.Object
  • java.io.InputStream
    • java.io.FilterInputStream
      • java.util.zip.InflaterInputStream
        • java.util.zip.ZipInputStream

Fields Summary
private Manifest	man
private JarEntry	first
private JarVerifier	jv
private ManifestEntryVerifier	mev

Constructors Summary
public JarInputStream(InputStream in) 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. param in the actual input stream exception IOException if an I/O error has occurred this(in, true);
public JarInputStream(InputStream in, boolean verify) 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. param in the actual input stream param verify whether or not to verify the JarInputStream if it is signed. exception IOException if an I/O error has occurred 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; }

Methods Summary
protected java.util.zip.ZipEntry	createZipEntry(java.lang.String name) 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. param name the name of the JAR/ZIP file entry return the JarEntry object just created JarEntry e = new JarEntry(name); if (man != null) { e.attr = man.getAttributes(name); } return e;
private byte[]	getBytes(java.io.InputStream is) byte[] buffer = new byte[8192]; ByteArrayOutputStream baos = new ByteArrayOutputStream(2048); int n; baos.reset(); while ((n = is.read(buffer, 0, buffer.length)) != -1) { baos.write(buffer, 0, n); } return baos.toByteArray();
public java.util.jar.Manifest	getManifest() Returns the Manifest for this JAR file, or null if none. return the Manifest for this JAR file, or null if none. return man;
public java.util.zip.ZipEntry	getNextEntry() 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. exception ZipException if a ZIP file error has occurred exception IOException if an I/O error has occurred exception SecurityException if any of the jar file entries are incorrectly signed. 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;
public java.util.jar.JarEntry	getNextJarEntry() 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. return the next JAR file entry, or null if there are no more entries exception ZipException if a ZIP file error has occurred exception IOException if an I/O error has occurred exception SecurityException if any of the jar file entries are incorrectly signed. return (JarEntry)getNextEntry();
public int	read(byte[] b, int off, int len) Reads from the current JAR file entry into an array of bytes. Blocks until some input is available. 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. param b the buffer into which the data is read param off the start offset of the data param len the maximum number of bytes to read return the actual number of bytes read, or -1 if the end of the entry is reached exception ZipException if a ZIP file error has occurred exception IOException if an I/O error has occurred exception SecurityException if any of the jar file entries are incorrectly signed. 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;