/*

 * Copyright (c) 2005, 2012, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code 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.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code 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 in the LICENSE file that

 * accompanied this code).

 *

 * 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package sun.security.smartcardio;

import java.io.File;

import java.io.IOException;

import java.security.AccessController;

import java.security.PrivilegedAction;

import sun.security.util.Debug;

/**

 * Platform specific code and functions for Unix / MUSCLE based PC/SC

 * implementations.

 *

 * @since   1.6

 * @author  Andreas Sterbenz

 */

class PlatformPCSC {

    static final Debug debug = Debug.getInstance("pcsc");

    static final Throwable initException;

    private final static String PROP_NAME = "sun.security.smartcardio.library";

    private final static String LIB1 = "/usr/$LIBISA/libpcsclite.so";

    private final static String LIB2 = "/usr/local/$LIBISA/libpcsclite.so";

    private final static String PCSC_FRAMEWORK = "/System/Library/Frameworks/PCSC.framework/Versions/Current/PCSC";

    PlatformPCSC() {

        // empty

    }

    static {

        initException = AccessController.doPrivileged(new PrivilegedAction<Throwable>() {

            public Throwable run() {

                try {

                    System.loadLibrary("j2pcsc");

                    String library = getLibraryName();

                    if (debug != null) {

                        debug.println("Using PC/SC library: " + library);

                    }

                    initialize(library);

                    return null;

                } catch (Throwable e) {

                    return e;

                }

            }

        });

    }

    // expand $LIBISA to the system specific directory name for libraries

    private static String expand(String lib) {

        int k = lib.indexOf("$LIBISA");

        if (k == -1) {

            return lib;

        }

        String s1 = lib.substring(0, k);

        String s2 = lib.substring(k + 7);

        String libDir;

        if ("64".equals(System.getProperty("sun.arch.data.model"))) {

            if ("SunOS".equals(System.getProperty("os.name"))) {

                libDir = "lib/64";

            } else {

                // assume Linux convention

                libDir = "lib64";

            }

        } else {

            // must be 32-bit

            libDir = "lib";

        }

        String s = s1 + libDir + s2;

        return s;

    }

    private static String getLibraryName() throws IOException {

        // if system property is set, use that library

        String lib = expand(System.getProperty(PROP_NAME, "").trim());

        if (lib.length() != 0) {

            return lib;

        }

        lib = expand(LIB1);

        if (new File(lib).isFile()) {

            // if LIB1 exists, use that

            return lib;

        }

        lib = expand(LIB2);

        if (new File(lib).isFile()) {

            // if LIB2 exists, use that

            return lib;

        }

        lib = PCSC_FRAMEWORK;

        if (new File(lib).isFile()) {

            // if PCSC.framework exists, use that

            return lib;

        }

        throw new IOException("No PC/SC library found on this system");

    }

    private static native void initialize(String libraryName);

    // PCSC constants defined differently under Windows and MUSCLE

    // MUSCLE version

    final static int SCARD_PROTOCOL_T0     =  0x0001;

    final static int SCARD_PROTOCOL_T1     =  0x0002;

    final static int SCARD_PROTOCOL_RAW    =  0x0004;

    final static int SCARD_UNKNOWN         =  0x0001;

    final static int SCARD_ABSENT          =  0x0002;

    final static int SCARD_PRESENT         =  0x0004;

    final static int SCARD_SWALLOWED       =  0x0008;

    final static int SCARD_POWERED         =  0x0010;

    final static int SCARD_NEGOTIABLE      =  0x0020;

    final static int SCARD_SPECIFIC        =  0x0040;

}