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Hex dump with byte positions

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git-svn-id: https://svn.apache.org/repos/asf/jakarta/poi/trunk@353319 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Rainer Klute 2003-08-30 09:05:19 +00:00
parent 3bde9312dd
commit 79f4e5f844
1 changed files with 24 additions and 5 deletions
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29
src/java/org/apache/poi/util/HexDump.java
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@ -56,6 +56,7 @@
package org.apache.poi.util; package org.apache.poi.util;
import java.io.*; import java.io.*;
import java.text.DecimalFormat;
/** /**
* dump data in hexadecimal format; derived from a HexDump utility I * dump data in hexadecimal format; derived from a HexDump utility I
@ -78,7 +79,7 @@ public class HexDump
}; };
private static final int _shifts[] = private static final int _shifts[] =
{ {
28, 24, 20, 16, 12, 8, 4, 0 60, 56, 52, 48, 44, 40, 36, 32, 28, 24, 20, 16, 12, 8, 4, 0
}; };
@ -307,20 +308,27 @@ public class HexDump
*/ */
public static String toHex(final byte[] value, final int bytesPerLine) public static String toHex(final byte[] value, final int bytesPerLine)
{ {
final int digits =
(int) Math.round(Math.log(value.length) / Math.log(10) + 0.5);
final StringBuffer formatString = new StringBuffer();
for (int i = 0; i < digits; i++)
formatString.append('0');
formatString.append(": ");
final DecimalFormat format = new DecimalFormat(formatString.toString());
StringBuffer retVal = new StringBuffer(); StringBuffer retVal = new StringBuffer();
retVal.append('['); retVal.append(format.format(0));
int i = -1; int i = -1;
for(int x = 0; x < value.length; x++) for(int x = 0; x < value.length; x++)
{ {
if (++i == bytesPerLine) if (++i == bytesPerLine)
{ {
retVal.append("\n "); retVal.append('\n');
retVal.append(format.format(x));
i = 0; i = 0;
} }
retVal.append(toHex(value[x])); retVal.append(toHex(value[x]));
retVal.append(", "); retVal.append(", ");
} }
retVal.append(']');
return retVal.toString(); return retVal.toString();
} }
@ -357,13 +365,24 @@ public class HexDump
return toHex(value, 8); return toHex(value, 8);
} }
/**
* Converts the parameter to a hex value.
*
* @param value The value to convert
* @return The result right padded with 0
*/
public static String toHex(final long value)
{
return toHex(value, 16);
}
private static String toHex(final long value, final int digits) private static String toHex(final long value, final int digits)
{ {
StringBuffer result = new StringBuffer(digits); StringBuffer result = new StringBuffer(digits);
for (int j = 0; j < digits; j++) for (int j = 0; j < digits; j++)
{ {
result.append( _hexcodes[ (int) ((value >> _shifts[ j + (8 - digits) ]) & 15)]); result.append( _hexcodes[ (int) ((value >> _shifts[ j + (16 - digits) ]) & 15)]);
} }
return result.toString(); return result.toString();
} }