package org.bouncycastle.test;

import org.bouncycastle.util.Pack;

import org.bouncycastle.util.encoders.Hex;

public class DumpUtil

{

/**

* Return a formatted hex dump of the given byte array.

* @param array byte array

*/

public static String hexdump(byte[] array)

{

return hexdump(0, array);

}

/**

* Return a formatted hex dump of the given byte array.

* If startIndent is non-zero, the dump is shifted right by startIndent octets.

* @param startIndent shift the octet stream between by a number of bytes

* @param array byte array

*/

public static String hexdump(int startIndent, byte[] array)

{

if (startIndent < 0)

{

throw new IllegalArgumentException("Start-Indent must be a positive number");

}

if (array == null)

{

return "<null>";

}

// -DM Hex.toHexString

String hex = Hex.toHexString(array);

StringBuilder withWhiteSpace = new StringBuilder();

// shift the dump a number of octets to the right

for (int i = 0; i < startIndent; i++)

{

withWhiteSpace.append(" ");

}

// Split into hex octets (pairs of two chars)

String[] octets = withWhiteSpace.append(hex).toString().split("(?<=\\G.{2})");

StringBuilder out = new StringBuilder();

int l = 0;

byte[] counterLabel = new byte[4];

while (l < octets.length)

{

// index row

Pack.intToBigEndian(l, counterLabel, 0);

out.append(Hex.toHexString(counterLabel)).append(" ");

// first 8 octets of a line

for (int i = l ; i < l + 8 && i < octets.length; i++)

{

out.append(octets[i]).append(" ");

}

out.append(" ");

// second 8 octets of a line

for (int i = l+8; i < l + 16 && i < octets.length; i++)

{

out.append(octets[i]).append(" ");

}

out.append("\n");

l += 16;

}

return out.toString();

}

}