Hex dump with byte positions
git-svn-id: https://svn.apache.org/repos/asf/jakarta/poi/trunk@353319 13f79535-47bb-0310-9956-ffa450edef68
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@ -56,6 +56,7 @@
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package org.apache.poi.util;
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import java.io.*;
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import java.text.DecimalFormat;
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/**
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* dump data in hexadecimal format; derived from a HexDump utility I
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@ -78,7 +79,7 @@ public class HexDump
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};
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private static final int _shifts[] =
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{
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28, 24, 20, 16, 12, 8, 4, 0
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60, 56, 52, 48, 44, 40, 36, 32, 28, 24, 20, 16, 12, 8, 4, 0
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};
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@ -307,20 +308,27 @@ public class HexDump
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*/
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public static String toHex(final byte[] value, final int bytesPerLine)
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{
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final int digits =
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(int) Math.round(Math.log(value.length) / Math.log(10) + 0.5);
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final StringBuffer formatString = new StringBuffer();
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for (int i = 0; i < digits; i++)
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formatString.append('0');
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formatString.append(": ");
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final DecimalFormat format = new DecimalFormat(formatString.toString());
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StringBuffer retVal = new StringBuffer();
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retVal.append('[');
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retVal.append(format.format(0));
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int i = -1;
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for(int x = 0; x < value.length; x++)
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{
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if (++i == bytesPerLine)
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{
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retVal.append("\n ");
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retVal.append('\n');
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retVal.append(format.format(x));
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i = 0;
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}
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retVal.append(toHex(value[x]));
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retVal.append(", ");
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}
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retVal.append(']');
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return retVal.toString();
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}
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@ -357,13 +365,24 @@ public class HexDump
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return toHex(value, 8);
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}
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/**
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* Converts the parameter to a hex value.
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*
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* @param value The value to convert
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* @return The result right padded with 0
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*/
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public static String toHex(final long value)
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{
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return toHex(value, 16);
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}
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private static String toHex(final long value, final int digits)
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{
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StringBuffer result = new StringBuffer(digits);
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for (int j = 0; j < digits; j++)
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{
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result.append( _hexcodes[ (int) ((value >> _shifts[ j + (8 - digits) ]) & 15)]);
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result.append( _hexcodes[ (int) ((value >> _shifts[ j + (16 - digits) ]) & 15)]);
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}
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return result.toString();
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}
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