/*
* @(#)Manifest.java 1.50 06/04/21
*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
package java.util.jar;
import java.io.FilterInputStream;
import java.io.DataOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.IOException;
import java.util.Map;
import java.util.HashMap;
import java.util.Iterator;
/**
* The Manifest class is used to maintain Manifest entry names and their
* associated Attributes. There are main Manifest Attributes as well as
* per-entry Attributes. For information on the Manifest format, please
* see the
* <a href="../../../../technotes/guides/jar/jar.html">
* Manifest format specification</a>.
*
* @author David Connelly
* @version 1.50, 04/21/06
* @see Attributes
* @since 1.2
*/
public class Manifest implements Cloneable {
// manifest main attributes
private Attributes attr = new Attributes();
// manifest entries
private Map entries = new HashMap();
/**
* Constructs a new, empty Manifest.
*/
public Manifest() {
}
/**
* Constructs a new Manifest from the specified input stream.
*
* @param is the input stream containing manifest data
* @throws IOException if an I/O error has occured
*/
public Manifest(InputStream is) throws IOException {
read(is);
}
/**
* Constructs a new Manifest that is a copy of the specified Manifest.
*
* @param man the Manifest to copy
*/
public Manifest(Manifest man) {
attr.putAll(man.getMainAttributes());
entries.putAll(man.getEntries());
}
/**
* Returns the main Attributes for the Manifest.
* @return the main Attributes for the Manifest
*/
public Attributes getMainAttributes() {
return attr;
}
/**
* Returns a Map of the entries contained in this Manifest. Each entry
* is represented by a String name (key) and associated Attributes (value).
* The Map permits the {@code null} key, but no entry with a null key is
* created by {@link #read}, nor is such an entry written by using {@link
* #write}.
*
* @return a Map of the entries contained in this Manifest
*/
public Map<String,Attributes> getEntries() {
return entries;
}
/**
* Returns the Attributes for the specified entry name.
* This method is defined as:
* <pre>
* return (Attributes)getEntries().get(name)
* </pre>
* Though {@code null} is a valid {@code name}, when
* {@code getAttributes(null)} is invoked on a {@code Manifest}
* obtained from a jar file, {@code null} will be returned. While jar
* files themselves do not allow {@code null}-named attributes, it is
* possible to invoke {@link #getEntries} on a {@code Manifest}, and
* on that result, invoke {@code put} with a null key and an
* arbitrary value. Subsequent invocations of
* {@code getAttributes(null)} will return the just-{@code put}
* value.
* <p>
* Note that this method does not return the manifest's main attributes;
* see {@link #getMainAttributes}.
*
* @param name entry name
* @return the Attributes for the specified entry name
*/
public Attributes getAttributes(String name) {
return (Attributes)getEntries().get(name);
}
/**
* Clears the main Attributes as well as the entries in this Manifest.
*/
public void clear() {
attr.clear();
entries.clear();
}
/**
* Writes the Manifest to the specified OutputStream.
* Attributes.Name.MANIFEST_VERSION must be set in
* MainAttributes prior to invoking this method.
*
* @param out the output stream
* @exception IOException if an I/O error has occurred
* @see #getMainAttributes
*/
public void write(OutputStream out) throws IOException {
DataOutputStream dos = new DataOutputStream(out);
// Write out the main attributes for the manifest
attr.writeMain(dos);
// Now write out the pre-entry attributes
Iterator it = entries.entrySet().iterator();
while (it.hasNext()) {
Map.Entry e = (Map.Entry)it.next();
StringBuffer buffer = new StringBuffer("Name: ");
String value = (String)e.getKey();
if (value != null) {
byte[] vb = value.getBytes("UTF8");
value = new String(vb, 0, 0, vb.length);
}
buffer.append(value);
buffer.append("\r\n");
make72Safe(buffer);
dos.writeBytes(buffer.toString());
((Attributes)e.getValue()).write(dos);
}
dos.flush();
}
/**
* Adds line breaks to enforce a maximum 72 bytes per line.
*/
static void make72Safe(StringBuffer line) {
int length = line.length();
if (length > 72) {
int index = 70;
while (index < length - 2) {
line.insert(index, "\r\n ");
index += 72;
length += 3;
}
}
return;
}
/**
* Reads the Manifest from the specified InputStream. The entry
* names and attributes read will be merged in with the current
* manifest entries.
*
* @param is the input stream
* @exception IOException if an I/O error has occurred
*/
public void read(InputStream is) throws IOException {
// Buffered input stream for reading manifest data
FastInputStream fis = new FastInputStream(is);
// Line buffer
byte[] lbuf = new byte[512];
// Read the main attributes for the manifest
attr.read(fis, lbuf);
// Total number of entries, attributes read
int ecount = 0, acount = 0;
// Average size of entry attributes
int asize = 2;
// Now parse the manifest entries
int len;
String name = null;
boolean skipEmptyLines = true;
byte[] lastline = null;
while ((len = fis.readLine(lbuf)) != -1) {
if (lbuf[--len] != '\n') {
throw new IOException("manifest line too long");
}
if (len > 0 && lbuf[len-1] == '\r') {
--len;
}
if (len == 0 && skipEmptyLines) {
continue;
}
skipEmptyLines = false;
if (name == null) {
name = parseName(lbuf, len);
if (name == null) {
throw new IOException("invalid manifest format");
}
if (fis.peek() == ' ') {
// name is wrapped
lastline = new byte[len - 6];
System.arraycopy(lbuf, 6, lastline, 0, len - 6);
continue;
}
} else {
// continuation line
byte[] buf = new byte[lastline.length + len - 1];
System.arraycopy(lastline, 0, buf, 0, lastline.length);
System.arraycopy(lbuf, 1, buf, lastline.length, len - 1);
if (fis.peek() == ' ') {
// name is wrapped
lastline = buf;
continue;
}
name = new String(buf, 0, buf.length, "UTF8");
lastline = null;
}
Attributes attr = getAttributes(name);
if (attr == null) {
attr = new Attributes(asize);
entries.put(name, attr);
}
attr.read(fis, lbuf);
ecount++;
acount += attr.size();
//XXX: Fix for when the average is 0. When it is 0,
// you get an Attributes object with an initial
// capacity of 0, which tickles a bug in HashMap.
asize = Math.max(2, acount / ecount);
name = null;
skipEmptyLines = true;
}
}
private String parseName(byte[] lbuf, int len) {
if (toLower(lbuf[0]) == 'n' && toLower(lbuf[1]) == 'a' &&
toLower(lbuf[2]) == 'm' && toLower(lbuf[3]) == 'e' &&
lbuf[4] == ':' && lbuf[5] == ' ') {
try {
return new String(lbuf, 6, len - 6, "UTF8");
}
catch (Exception e) {
}
}
return null;
}
private int toLower(int c) {
return (c >= 'A' && c <= 'Z') ? 'a' + (c - 'A') : c;
}
/**
* Returns true if the specified Object is also a Manifest and has
* the same main Attributes and entries.
*
* @param o the object to be compared
* @return true if the specified Object is also a Manifest and has
* the same main Attributes and entries
*/
public boolean equals(Object o) {
if (o instanceof Manifest) {
Manifest m = (Manifest)o;
return attr.equals(m.getMainAttributes()) &&
entries.equals(m.getEntries());
} else {
return false;
}
}
/**
* Returns the hash code for this Manifest.
*/
public int hashCode() {
return attr.hashCode() + entries.hashCode();
}
/**
* Returns a shallow copy of this Manifest. The shallow copy is
* implemented as follows:
* <pre>
* public Object clone() { return new Manifest(this); }
* </pre>
* @return a shallow copy of this Manifest
*/
public Object clone() {
return new Manifest(this);
}
/*
* A fast buffered input stream for parsing manifest files.
*/
static class FastInputStream extends FilterInputStream {
private byte buf[];
private int count = 0;
private int pos = 0;
FastInputStream(InputStream in) {
this(in, 8192);
}
FastInputStream(InputStream in, int size) {
super(in);
buf = new byte[size];
}
public int read() throws IOException {
if (pos >= count) {
fill();
if (pos >= count) {
return -1;
}
}
return buf[pos++] & 0xff;
}
public int read(byte[] b, int off, int len) throws IOException {
int avail = count - pos;
if (avail <= 0) {
if (len >= buf.length) {
return in.read(b, off, len);
}
fill();
avail = count - pos;
if (avail <= 0) {
return -1;
}
}
if (len > avail) {
len = avail;
}
System.arraycopy(buf, pos, b, off, len);
pos += len;
return len;
}
/*
* Reads 'len' bytes from the input stream, or until an end-of-line
* is reached. Returns the number of bytes read.
*/
public int readLine(byte[] b, int off, int len) throws IOException {
byte[] tbuf = this.buf;
int total = 0;
while (total < len) {
int avail = count - pos;
if (avail <= 0) {
fill();
avail = count - pos;
if (avail <= 0) {
return -1;
}
}
int n = len - total;
if (n > avail) {
n = avail;
}
int tpos = pos;
int maxpos = tpos + n;
while (tpos < maxpos && tbuf[tpos++] != '\n') ;
n = tpos - pos;
System.arraycopy(tbuf, pos, b, off, n);
off += n;
total += n;
pos = tpos;
if (tbuf[tpos-1] == '\n') {
break;
}
}
return total;
}
public byte peek() throws IOException {
if (pos == count)
fill();
return buf[pos];
}
public int readLine(byte[] b) throws IOException {
return readLine(b, 0, b.length);
}
public long skip(long n) throws IOException {
if (n <= 0) {
return 0;
}
long avail = count - pos;
if (avail <= 0) {
return in.skip(n);
}
if (n > avail) {
n = avail;
}
pos += n;
return n;
}
public int available() throws IOException {
return (count - pos) + in.available();
}
public void close() throws IOException {
if (in != null) {
in.close();
in = null;
buf = null;
}
}
private void fill() throws IOException {
count = pos = 0;
int n = in.read(buf, 0, buf.length);
if (n > 0) {
count = n;
}
}
}
}