/*
*
*
* Copyright 1990-2007 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version
* 2 only, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License version 2 for more details (a copy is
* included at /legal/license.txt).
*
* You should have received a copy of the GNU General Public License
* version 2 along with this work; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
* Clara, CA 95054 or visit www.sun.com if you need additional
* information or have any questions.
*/
package util;
import components.*;
import java.io.DataInput;
import java.io.DataInputStream;
import java.io.DataOutput;
import java.io.IOException;
import java.io.PrintStream;
import java.io.InputStream;
import java.util.Enumeration;
import java.util.Hashtable;
import jcc.Const;
/*
* Reading of class files.
* Which is different from reading a class from a multi-class file.
* But not much.
* Much of the real work is done in components.ClassInfo.
*
* There would be stuff for writing class files here, too, but we've
* never been called upon to do that operation.
*
* Also includes a small test program for reading and dumping
* a class file.
*/
public
class ClassFile
{
// Input file name
public String fileName;
public boolean didRead = false;
public Exception failureMode; // only for didRead == false.
public boolean verbose = false;
public ClassInfo clas;
PrintStream log = System.out;
InputStream istream;
// Identifies the classfile format
int minorID,
majorID;
public ClassFile(String name, boolean v ) {
fileName = name;
verbose = v;
clas = new ClassInfo( v );
istream = null;
}
public ClassFile(String name, InputStream i, boolean v ) {
fileName = name;
verbose = v;
clas = new ClassInfo( v );
istream = i;
}
// Read in the entire class file
public boolean
readClassFile( ConstantPool t ) {
DataInputStream in = null;
failureMode = null;
done:
try {
int magic;
if ( istream == null ){
istream = new java.io.BufferedInputStream( new java.io.FileInputStream( fileName ) );
}
in = new DataInputStream( istream );
if ((magic = in.readInt()) != Const.JAVA_MAGIC) {
failureMode = new IOException(Localizer.getString("classfile.bad_magic.ioexception"));
break done; // bad magic -- bail immediately.
}
minorID = in.readShort();
majorID = in.readShort();
//if (minorID != Const.JAVA_MINOR_VERSION) {
// failureMode = new IOException(Localizer.getString("classfile.bad_minor_version_number.ioexception"));
// break done; // bad magic -- bail immediately.
//}
//
//if (majorID != Const.JAVA_VERSION) {
// failureMode = new IOException(Localizer.getString("classfile.bad_major_version_number.ioexception"));
// break done; // bad magic -- bail immediately.
//}
if(verbose){
log.println(Localizer.getString("classfile._file", fileName)+
Localizer.getString("classfile._magic/major/minor",
Integer.toHexString( magic ),
Integer.toHexString( majorID ),
Integer.toHexString( minorID )));
}
clas.read( in, true, t );
didRead = true;
} catch ( Exception e ){
failureMode = e;
}
if ( in != null ){
try{
in.close();
} catch ( IOException e ){
if (didRead==true){
didRead=false;
failureMode=e;
}
}
}
return didRead;
}
public void
dump( PrintStream o ){
o.println(Localizer.getString("classfile.file", fileName));
if ( ! didRead ){
o.println(Localizer.getString(
"classfile.could_not_be_read_because_of",
failureMode));
if ( failureMode != null ) // IMPL_NOTE: consider whether this
// should be fixed
failureMode.printStackTrace( o );
return;
}
clas.dump( o );
}
/*
* Simple test program.
* Parameters: list of class files to read and process.
*/
public static void main( String clist[] ){
for( int i = 0; i < clist.length; i++ ){
ClassFile f = new ClassFile( clist[i], true );
if (f.readClassFile( null ) != true ){
System.out.println(Localizer.getString(
"classfile.read_of",
clist[i]));
f.dump( System.out );
continue;
}
f.clas.countReferences( true );
f.dump( System.out );
}
}
}
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