/*

 * Copyright (c) 1997, 2008, 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.

 */

/*

 * The Original Code is HAT. The Initial Developer of the

 * Original Code is Bill Foote, with contributions from others

 * at JavaSoft/Sun.

 */

package com.sun.tools.hat.internal.util;

import java.util.*;

/**

 * Miscellaneous functions I couldn't think of a good place to put.

 *

 * @author      Bill Foote

 */

public class Misc {

    private static char[] digits = { '0', '1', '2', '3', '4', '5', '6', '7',

                                     '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };

    public final static String toHex(int addr) {

        char[] buf = new char[8];

        int i = 0;

        for (int s = 28; s >= 0; s -= 4) {

            buf[i++] = digits[(addr >> s) & 0xf];

        }

        return "0x" + new String(buf);

    }

    public final static String toHex(long addr) {

        return "0x" + Long.toHexString(addr);

    }

    public final static long parseHex(String value) {

        long result = 0;

        if (value.length() < 2 || value.charAt(0) != '0' ||

            value.charAt(1) != 'x') {

            return -1L;

        }

        for(int i = 2; i < value.length(); i++) {

            result *= 16;

            char ch = value.charAt(i);

            if (ch >= '0' && ch <= '9') {

                result += (ch - '0');

            } else if (ch >= 'a' && ch <= 'f') {

                result += (ch - 'a') + 10;

            } else if (ch >= 'A' && ch <= 'F') {

                result += (ch - 'A') + 10;

            } else {

                throw new NumberFormatException("" + ch

                                        + " is not a valid hex digit");

            }

        }

        return result;

    }

    public static String encodeHtml(String str) {

        final int len = str.length();

        StringBuffer buf = new StringBuffer();

        for (int i = 0; i < len; i++) {

            char ch = str.charAt(i);

            if (ch == '<') {

                buf.append("<");

            } else if (ch == '>') {

                buf.append(">");

            } else if (ch == '"') {

                buf.append(""");

            } else if (ch == '\'') {

                buf.append("'");

            } else if (ch == '&') {

                buf.append("&");

            } else if (ch < ' ') {

                buf.append("&#" + Integer.toString(ch) + ";");

            } else {

                int c = (ch & 0xFFFF);

                if (c > 127) {

                    buf.append("&#" + Integer.toString(c) + ";");

                } else {

                    buf.append(ch);

                }

            }

        }

        return buf.toString();

    }

}