org.armedbear.lisp.unzip Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of abcl Show documentation
Common Lisp implementation running on the JVM
There is a newer version: 1.9.2
/*
 * unzip.java
 *
 * Copyright (C) 2010 Mark Evenson
 * $Id$
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * 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 for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * As a special exception, the copyright holders of this library give you
 * permission to link this library with independent modules to produce an
 * executable, regardless of the license terms of these independent
 * modules, and to copy and distribute the resulting executable under
 * terms of your choice, provided that you also meet, for each linked
 * independent module, the terms and conditions of the license of that
 * module.  An independent module is a module which is not derived from
 * or based on this library.  If you modify this library, you may extend
 * this exception to your version of the library, but you are not
 * obligated to do so.  If you do not wish to do so, delete this
 * exception statement from your version.
 */

package org.armedbear.lisp;

import static org.armedbear.lisp.Lisp.*;
import java.io.File;
import java.io.InputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Enumeration;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;

@DocString(name="unzip",
           args="pathname &optional directory => unzipped_pathnames",
           doc="Unpack zip archive at PATHNAME returning a list of extracted pathnames.\nIf the optional DIRECTORY is specified, root the abstraction in that directory, otherwise use the current value of *DEFAULT-PATHNAME-DEFAULTS.")
public final class unzip 
  extends Primitive
{
    public unzip() {
        super("unzip", PACKAGE_SYS, true, 
              "pathname &optional directory => unzipped_pathnames");
    }
  
    @Override
    public LispObject execute(LispObject first) {
        Pathname zipFile = coerceToPathname(first);
        Pathname directory = coerceToPathname(Symbol.DEFAULT_PATHNAME_DEFAULTS.symbolValue());
        return unzipToDirectory(zipFile, directory);
    }

    @Override
    public LispObject execute(LispObject first, LispObject second) {
        Pathname zipFile = coerceToPathname(first);
        Pathname directory = coerceToPathname(second);
        directory.name = NIL;
        directory.type = NIL;
        directory.invalidateNamestring();
        return unzipToDirectory(zipFile, directory);
    }
  
    private LispObject unzipToDirectory(Pathname zipPath, Pathname dirPath) {
        if (!zipPath.isAbsolute()) {
            zipPath = Pathname.mergePathnames(zipPath,
                                              coerceToPathname(Symbol.DEFAULT_PATHNAME_DEFAULTS.symbolValue()));
        }
        LispObject o = Pathname.truename(zipPath, false);
        if (!(o instanceof Pathname)) {
            return error(new FileError("No file found: " + zipPath, zipPath));
        }
        String zip = ((Pathname)o).getNamestring();
        if (zip == null) {
            return error(new FileError("Pathname has no namestring: " + zip, zipPath));
        }
        String dir = dirPath.getNamestring();
        if (dir == null) {
            return error(new FileError("Could not parse diretory: " + dirPath, dirPath));
        }
        LispObject result = NIL;
        try {
            ZipFile zipfile = new ZipFile(zip);
            
            byte[] buffer = new byte[4096];
            for (Enumeration entries =  zipfile.entries();entries.hasMoreElements();) {
                ZipEntry entry = entries.nextElement();
                String name = entry.getName();
                String filename = dir + name;
                File file = new File(filename);
                if (entry.isDirectory()) {
                    file.mkdirs();
                    continue;
                }
                FileOutputStream out = new FileOutputStream(file);
                InputStream in = zipfile.getInputStream(entry);
                int n;
                while ((n = in.read(buffer)) > 0) {
                    out.write(buffer, 0, n);
                }
                out.close();
                in.close();
                result = result.push(new Pathname(filename));
            }
        } catch (IOException e) {
            return error(new FileError("Failed to unzip " 
                                       + "'" + zipPath + "'"
                                       + " into " + "'" + dirPath + "'"
                                       + ": " + e, zipPath)); 
        }
        return result;
    }

    private static final Primitive unzip = new unzip();
}