Here you can find the source of toHexDump(byte[] buffer, int offset, int length, boolean hex, boolean ascii)
| Parameter | Description |
|---|---|
| buffer | The data buffer. |
| offset | The offset into the buffer to start with. |
| length | The number of bytes to display. |
| hex | Show hex version? |
| ascii | Show ASCII version? |
public static CharSequence toHexDump(byte[] buffer, int offset, int length, boolean hex, boolean ascii)
//package com.java2s; /**// w ww . jav a 2 s. c o m * This file is protected by Copyright. Please refer to the COPYRIGHT file * distributed with this source distribution. * * This file is part of REDHAWK. * * REDHAWK 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, either version 3 of the License, or (at your * option) any later version. * * REDHAWK 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, see http://www.gnu.org/licenses/. */ public class Main { /** Creates a hexdump-like output for a given data buffer. This is identical to * <tt>toHexDump(buffer,offset,length,true,true,true,"\n")</tt>. * @param buffer The data buffer. * @param offset The offset into the buffer to start with. * @param length The number of bytes to display. * @return The hexdump text (this will be an empty character sequence if both <tt>hex</tt> and * <tt>ascii</tt> are false). */ public static CharSequence toHexDump(byte[] buffer, int offset, int length) { return toHexDump(buffer, offset, length, true, true, true, "\n"); } /** Creates a hexdump-like output for a given data buffer. This is identical to * <tt>toHexDump(buffer,offset,length,hex,ascii,true,"\n")</tt>. * @param buffer The data buffer. * @param offset The offset into the buffer to start with. * @param length The number of bytes to display. * @param hex Show hex version? * @param ascii Show ASCII version? * @return The hexdump text (this will be an empty character sequence if both <tt>hex</tt> and * <tt>ascii</tt> are false). */ public static CharSequence toHexDump(byte[] buffer, int offset, int length, boolean hex, boolean ascii) { return toHexDump(buffer, offset, length, hex, ascii, true, "\n"); } /** Creates a hexdump-like output for a given data buffer. * @param buffer The data buffer. * @param offset The offset into the buffer to start with. * @param length The number of bytes to display. * @param hex Show hex version? * @param ascii Show ASCII version? * @param index Show index values? * @param eol End of line character (usually "\n"). * @return The hexdump text (this will be an empty character sequence if both <tt>hex</tt> and * <tt>ascii</tt> are false). */ public static CharSequence toHexDump(byte[] buffer, int offset, int length, boolean hex, boolean ascii, boolean index, String eol) { StringBuilder str = new StringBuilder(); StringBuilder txt = new StringBuilder(); if (hex) { for (int i = offset, j = 0; j < length;) { if (index) { str.append(j).append(": \t"); } for (int k = 0; k < 16; i++, j++, k++) { if (j >= length) { str.append(" "); txt.append(" "); } else { int b = buffer[i] & 0xFF; char c = ((b < 0x20) || (b >= 0x7F)) ? '.' : (char) b; int n1 = b >> 4; int n2 = b & 0xF; int q1 = n1 & ((n1 << 1) | (n1 << 2)) & 0x8; // 0x0 if <0xA, 0x8 if >=0xA int q2 = n2 & ((n2 << 1) | (n2 << 2)) & 0x8; // 0x0 if <0xA, 0x8 if >=0xA char c1 = (char) (n1 + 0x30 + q1 - (q1 >> 3)); // q-(q>>3) = 0x8-0x1 = 'A'-'9'-1 if >=0xA char c2 = (char) (n2 + 0x30 + q2 - (q2 >> 3)); // q-(q>>3) = 0x8-0x1 = 'A'-'9'-1 if >=0xA str.append(c1).append(c2).append(' '); txt.append(c); } if (k == 7) str.append(' '); } if (ascii) { str.append(" | ").append(txt); txt.setLength(0); } str.append(eol); } } else if (ascii) { for (int i = offset, j = 0; j < length;) { if (index) { str.append(j).append(": \t"); } for (int k = 0; k < 80; i++, j++, k++) { if (j >= length) { str.append(" "); } else { int b = buffer[i] & 0xFF; char c = ((b < 0x20) || (b >= 0x7F)) ? '.' : (char) b; str.append(c); } } str.append(eol); } } return str; } /** Appends a value to a string buffer if not null. * @param str The string buffer * @param name The name of the value. * @param val The value. */ public static void append(StringBuilder str, String name, Object val) { if (val != null) str.append(name).append(val); } /** Appends a value to a string buffer if not null. * @param str The string buffer * @param prefix Prefix to include. * @param val The value. * @param suffix Suffix to include. */ public static void append(StringBuilder str, String prefix, Object val, String suffix) { if (val != null) str.append(prefix).append(val).append(suffix); } }