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/* FJBG -- Fast Java Bytecode Generator
* Copyright 2002-2011 LAMP/EPFL
* @author Michel Schinz
*/
package ch.epfl.lamp.fjbg;
import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.jar.JarFile;
import java.util.zip.ZipEntry;
/**
* Main program entry to execute the FJBG reader from the command line.
*
* The reader prints out the decoded data in the same output format as
* javap, the Java bytecode disassembler of the Sun J2SE SDK.
*
* @author Stephane Micheloud
* @version 1.1
*/
public class Main {
private static final String PRODUCT_STRING = "Fast Java Bytecode Generator";
private static final String VERSION_STRING = "version 1.1";
private static final int ACTION_USAGE = 0;
private static final int ACTION_DONE = 1;
private static final int ACTION_PROCEED = 2;
private static String classPath = ".";
private static String[] classNames = null;
public static void main(String[] args) {
switch (parseArgs(args)) {
case ACTION_USAGE: printUsage(); break;
case ACTION_PROCEED: processClasses(); break;
default:
}
}
private static void processClasses() {
FJBGContext fjbgContext = new FJBGContext(49, 0);
if (classNames.length > 0)
try {
for (int i = 0; i < classNames.length; ++i)
processClass(fjbgContext, classNames[i]);
} catch (IOException e) {
System.err.println(e.getMessage());
}
else
System.err.println(
"No classes were specified on the command line. Try -help.");
}
private static void processClass(FJBGContext fjbgContext, String className)
throws IOException {
InputStream in = getInputStream(className);
JClass jclass = fjbgContext.JClass(new DataInputStream(in));
System.out.println(jclass);
in.close();
}
private static InputStream getInputStream(String className) throws IOException {
String name = null;
String[] paths = classPath.split(File.pathSeparator);
for (int i = 0; i < paths.length; ++i) {
File parent = new File(paths[i]);
if (parent.isDirectory()) {
name = className.replace('.', File.separatorChar)+".class";
File f = new File(parent, name);
if (f.isFile()) return new FileInputStream(f);
} else if (paths[i].endsWith(".jar")) {
JarFile f = new JarFile(parent);
name = className.replace('.', '/')+".class";
ZipEntry e = f.getEntry(name);
if (e != null) return f.getInputStream(e);
}
}
throw new IOException("ERROR:Could not find "+className);
}
private static int parseArgs(String[] args) {
ArrayList/*<String>*/ classes = new ArrayList();
String arg = null;
int action = ACTION_USAGE;
int i = 0, n = args.length;
while (i < n) {
arg = args[i];
if (arg.equals("-classpath") && (i+1) < n) {
classPath = args[i+1]; i += 2;
} else if (arg.equals("-cp") && (i+1) < n) {
classPath = args[i+1]; i += 2;
} else if (arg.equals("-help")) {
i = n+1;
//} else if (arg.equals("-v")) {
// verbose = true; i += 1;
} else if (arg.equals("-version")) {
System.err.println(PRODUCT_STRING+" "+VERSION_STRING);
action = ACTION_DONE; i = n+1;
} else if (arg.startsWith("-")) {
System.err.println("invalid flag: "+arg);
i = n+1;
} else {
classes.add(arg); i += 1;
}
}
if (i == n && i > 0) {
classNames = (String[])classes.toArray(new String[classes.size()]);
action = ACTION_PROCEED;
}
return action;
}
private static void printUsage() {
System.out.println("Usage: fjbg <options> <classes>");
System.out.println();
System.out.println("where possible options include:");
System.out.println(" -cp <path> Specify where to find user class files");
System.out.println(" -classpath <path> Specify where to find user class files");
System.out.println(" -help Print a synopsis of standard options");
System.out.println(" -version Version information");
System.out.println();
System.exit(1);
}
}
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