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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package java.util.jar;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.reflect.Field;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.CharsetEncoder;
import java.nio.charset.CoderResult;
import java.nio.charset.StandardCharsets;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import libcore.io.Streams;
/**
* The {@code Manifest} class is used to obtain attribute information for a
* {@code JarFile} and its entries.
*/
public class Manifest implements Cloneable {
static final int LINE_LENGTH_LIMIT = 72;
private static final byte[] LINE_SEPARATOR = new byte[] { '\r', '\n' };
private static final byte[] VALUE_SEPARATOR = new byte[] { ':', ' ' };
private static final Field BAIS_BUF = getByteArrayInputStreamField("buf");
private static final Field BAIS_POS = getByteArrayInputStreamField("pos");
private static Field getByteArrayInputStreamField(String name) {
try {
Field f = ByteArrayInputStream.class.getDeclaredField(name);
f.setAccessible(true);
return f;
} catch (Exception ex) {
throw new AssertionError(ex);
}
}
private Attributes mainAttributes = new Attributes();
private HashMap entries = new HashMap();
static class Chunk {
int start;
int end;
Chunk(int start, int end) {
this.start = start;
this.end = end;
}
}
private HashMap chunks;
/**
* The end of the main attributes section in the manifest is needed in
* verification.
*/
private int mainEnd;
/**
* Creates a new {@code Manifest} instance.
*/
public Manifest() {
}
/**
* Creates a new {@code Manifest} instance using the attributes obtained
* from the input stream.
*
* @param is
* {@code InputStream} to parse for attributes.
* @throws IOException
* if an IO error occurs while creating this {@code Manifest}
*/
public Manifest(InputStream is) throws IOException {
read(is);
}
/**
* Creates a new {@code Manifest} instance. The new instance will have the
* same attributes as those found in the parameter {@code Manifest}.
*
* @param man
* {@code Manifest} instance to obtain attributes from.
*/
@SuppressWarnings("unchecked")
public Manifest(Manifest man) {
mainAttributes = (Attributes) man.mainAttributes.clone();
entries = (HashMap) ((HashMap) man
.getEntries()).clone();
}
Manifest(InputStream is, boolean readChunks) throws IOException {
if (readChunks) {
chunks = new HashMap();
}
read(is);
}
/**
* Resets the both the main attributes as well as the entry attributes
* associated with this {@code Manifest}.
*/
public void clear() {
entries.clear();
mainAttributes.clear();
}
/**
* Returns the {@code Attributes} associated with the parameter entry
* {@code name}.
*
* @param name
* the name of the entry to obtain {@code Attributes} from.
* @return the Attributes for the entry or {@code null} if the entry does
* not exist.
*/
public Attributes getAttributes(String name) {
return getEntries().get(name);
}
/**
* Returns a map containing the {@code Attributes} for each entry in the
* {@code Manifest}.
*
* @return the map of entry attributes.
*/
public Map getEntries() {
return entries;
}
/**
* Returns the main {@code Attributes} of the {@code JarFile}.
*
* @return main {@code Attributes} associated with the source {@code
* JarFile}.
*/
public Attributes getMainAttributes() {
return mainAttributes;
}
/**
* Creates a copy of this {@code Manifest}. The returned {@code Manifest}
* will equal the {@code Manifest} from which it was cloned.
*
* @return a copy of this instance.
*/
@Override
public Object clone() {
return new Manifest(this);
}
/**
* Writes this {@code Manifest}'s name/attributes pairs to the given {@code OutputStream}.
* The {@code MANIFEST_VERSION} or {@code SIGNATURE_VERSION} attribute must be set before
* calling this method, or no attributes will be written.
*
* @throws IOException
* If an error occurs writing the {@code Manifest}.
*/
public void write(OutputStream os) throws IOException {
write(this, os);
}
/**
* Merges name/attribute pairs read from the input stream {@code is} into this manifest.
*
* @param is
* The {@code InputStream} to read from.
* @throws IOException
* If an error occurs reading the manifest.
*/
public void read(InputStream is) throws IOException {
byte[] buf;
if (is instanceof ByteArrayInputStream) {
buf = exposeByteArrayInputStreamBytes((ByteArrayInputStream) is);
} else {
buf = Streams.readFullyNoClose(is);
}
if (buf.length == 0) {
return;
}
// a workaround for HARMONY-5662
// replace EOF and NUL with another new line
// which does not trigger an error
byte b = buf[buf.length - 1];
if (b == 0 || b == 26) {
buf[buf.length - 1] = '\n';
}
ManifestReader im = new ManifestReader(buf, mainAttributes);
mainEnd = im.getEndOfMainSection();
im.readEntries(entries, chunks);
}
/**
* Returns a byte[] containing all the bytes from a ByteArrayInputStream.
* Where possible, this returns the actual array rather than a copy.
*/
private static byte[] exposeByteArrayInputStreamBytes(ByteArrayInputStream bais) {
byte[] buffer;
synchronized (bais) {
byte[] buf;
int pos;
try {
buf = (byte[]) BAIS_BUF.get(bais);
pos = BAIS_POS.getInt(bais);
} catch (IllegalAccessException iae) {
throw new AssertionError(iae);
}
int available = bais.available();
if (pos == 0 && buf.length == available) {
buffer = buf;
} else {
buffer = new byte[available];
System.arraycopy(buf, pos, buffer, 0, available);
}
bais.skip(available);
}
return buffer;
}
/**
* Returns the hash code for this instance.
*
* @return this {@code Manifest}'s hashCode.
*/
@Override
public int hashCode() {
return mainAttributes.hashCode() ^ getEntries().hashCode();
}
/**
* Determines if the receiver is equal to the parameter object. Two {@code
* Manifest}s are equal if they have identical main attributes as well as
* identical entry attributes.
*
* @param o
* the object to compare against.
* @return {@code true} if the manifests are equal, {@code false} otherwise
*/
@Override
public boolean equals(Object o) {
if (o == null) {
return false;
}
if (o.getClass() != this.getClass()) {
return false;
}
if (!mainAttributes.equals(((Manifest) o).mainAttributes)) {
return false;
}
return getEntries().equals(((Manifest) o).getEntries());
}
Chunk getChunk(String name) {
return chunks.get(name);
}
void removeChunks() {
chunks = null;
}
int getMainAttributesEnd() {
return mainEnd;
}
/**
* Writes out the attribute information of the specified manifest to the
* specified {@code OutputStream}
*
* @param manifest
* the manifest to write out.
* @param out
* The {@code OutputStream} to write to.
* @throws IOException
* If an error occurs writing the {@code Manifest}.
*/
static void write(Manifest manifest, OutputStream out) throws IOException {
CharsetEncoder encoder = StandardCharsets.UTF_8.newEncoder();
ByteBuffer buffer = ByteBuffer.allocate(LINE_LENGTH_LIMIT);
Attributes.Name versionName = Attributes.Name.MANIFEST_VERSION;
String version = manifest.mainAttributes.getValue(versionName);
if (version == null) {
versionName = Attributes.Name.SIGNATURE_VERSION;
version = manifest.mainAttributes.getValue(versionName);
}
if (version != null) {
writeEntry(out, versionName, version, encoder, buffer);
Iterator entries = manifest.mainAttributes.keySet().iterator();
while (entries.hasNext()) {
Attributes.Name name = (Attributes.Name) entries.next();
if (!name.equals(versionName)) {
writeEntry(out, name, manifest.mainAttributes.getValue(name), encoder, buffer);
}
}
}
out.write(LINE_SEPARATOR);
Iterator i = manifest.getEntries().keySet().iterator();
while (i.hasNext()) {
String key = i.next();
writeEntry(out, Attributes.Name.NAME, key, encoder, buffer);
Attributes attributes = manifest.entries.get(key);
Iterator entries = attributes.keySet().iterator();
while (entries.hasNext()) {
Attributes.Name name = (Attributes.Name) entries.next();
writeEntry(out, name, attributes.getValue(name), encoder, buffer);
}
out.write(LINE_SEPARATOR);
}
}
private static void writeEntry(OutputStream os, Attributes.Name name,
String value, CharsetEncoder encoder, ByteBuffer bBuf) throws IOException {
String nameString = name.getName();
os.write(nameString.getBytes(StandardCharsets.US_ASCII));
os.write(VALUE_SEPARATOR);
encoder.reset();
bBuf.clear().limit(LINE_LENGTH_LIMIT - nameString.length() - 2);
CharBuffer cBuf = CharBuffer.wrap(value);
while (true) {
CoderResult r = encoder.encode(cBuf, bBuf, true);
if (CoderResult.UNDERFLOW == r) {
r = encoder.flush(bBuf);
}
os.write(bBuf.array(), bBuf.arrayOffset(), bBuf.position());
os.write(LINE_SEPARATOR);
if (CoderResult.UNDERFLOW == r) {
break;
}
os.write(' ');
bBuf.clear().limit(LINE_LENGTH_LIMIT - 1);
}
}
}
