Hexdump.java Source code

Introduction

Here is the source code for Hexdump.java

Source

/*
 * Java Hexdump Library Copyright (c) Matthew Johnson 2005 This program is free
 * software; you can redistribute it and/or modify it under the terms of the GNU
 * Lesser General Public License as published by the Free Software Foundation,
 * version 2 only. 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 Lesser
 * General Public License for more details. You should have received a copy of
 * the GNU Lesser General Public License along with this program; if not, write
 * to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA. To Contact the author, please email
 * src@matthew.ath.cx
 */

//package cx.ath.matthew.utils;

import java.io.PrintStream;

public class Hexdump {
    public static final char[] hexchars = new char[] { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b',
            'c', 'd', 'e', 'f' };

    public static String format(byte[] buf) {
        return format(buf, 80);
    }

    public static String format(byte[] buf, int width) {
        int bs = (width - 8) / 4;
        int i = 0;
        StringBuffer sb = new StringBuffer();
        do {
            for (int j = 0; j < 6; j++) {
                sb.append(hexchars[(i << (j * 4) & 0xF00000) >> 20]);
            }
            sb.append('\t');
            sb.append(toHex(buf, i, bs));
            sb.append(' ');
            sb.append(toAscii(buf, i, bs));
            sb.append('\n');
            i += bs;
        } while (i < buf.length);
        return sb.toString();
    }

    public static void print(byte[] buf) {
        print(buf, System.err);
    }

    public static void print(byte[] buf, int width) {
        print(buf, width, System.err);
    }

    public static void print(byte[] buf, int width, PrintStream out) {
        out.print(format(buf, width));
    }

    public static void print(byte[] buf, PrintStream out) {
        out.print(format(buf));
    }

    public static String toAscii(byte[] buf) {
        return toAscii(buf, 0, buf.length);
    }

    public static String toAscii(byte[] buf, int ofs, int len) {
        StringBuffer sb = new StringBuffer();
        int j = ofs + len;
        for (int i = ofs; i < j; i++) {
            if (i < buf.length) {
                if ((20 <= buf[i]) && (126 >= buf[i])) {
                    sb.append((char) buf[i]);
                } else {
                    sb.append('.');
                }
            } else {
                sb.append(' ');
            }
        }
        return sb.toString();
    }

    /**
     * Returns a string which can be written to a Java source file as part of a
     * static initializer for a byte array. Returns data in the format 0xAB,
     * 0xCD, .... use like: javafile.print("byte[] data = {")
     * javafile.print(Hexdump.toByteArray(data)); javafile.println("};");
     */
    public static String toByteArray(byte[] buf) {
        return toByteArray(buf, 0, buf.length);
    }

    /**
     * Returns a string which can be written to a Java source file as part of a
     * static initializer for a byte array. Returns data in the format 0xAB,
     * 0xCD, .... use like: javafile.print("byte[] data = {")
     * javafile.print(Hexdump.toByteArray(data)); javafile.println("};");
     */
    public static String toByteArray(byte[] buf, int ofs, int len) {
        StringBuffer sb = new StringBuffer();
        for (int i = ofs; (i < len) && (i < buf.length); i++) {
            sb.append('0');
            sb.append('x');
            sb.append(hexchars[(buf[i] & 0xF0) >> 4]);
            sb.append(hexchars[buf[i] & 0x0F]);
            if (((i + 1) < len) && ((i + 1) < buf.length)) {
                sb.append(',');
            }
        }
        return sb.toString();
    }

    public static String toHex(byte[] buf) {
        return toHex(buf, 0, buf.length);
    }

    public static String toHex(byte[] buf, int ofs, int len) {
        StringBuffer sb = new StringBuffer();
        int j = ofs + len;
        for (int i = ofs; i < j; i++) {
            if (i < buf.length) {
                sb.append(hexchars[(buf[i] & 0xF0) >> 4]);
                sb.append(hexchars[buf[i] & 0x0F]);
                sb.append(' ');
            } else {
                sb.append(' ');
                sb.append(' ');
                sb.append(' ');
            }
        }
        return sb.toString();
    }
}