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jeremybenn |
/* Util.java -- Miscellaneous utility methods.
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Copyright (C) 2004, 2006 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package gnu.java.security.x509;
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import gnu.java.lang.CPStringBuilder;
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/**
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* A collection of useful class methods.
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*
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* @author Casey Marshall (rsdio@metastatic.org)
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*/
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public final class Util
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{
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// Constants.
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// -------------------------------------------------------------------------
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public static final String HEX = "0123456789abcdef";
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// Class methods.
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// -------------------------------------------------------------------------
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/**
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* Convert a byte array to a hexadecimal string, as though it were a
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* big-endian arbitrarily-sized integer.
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*
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* @param buf The bytes to format.
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* @param off The offset to start at.
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* @param len The number of bytes to format.
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* @return A hexadecimal representation of the specified bytes.
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*/
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public static String toHexString(byte[] buf, int off, int len)
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{
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CPStringBuilder str = new CPStringBuilder();
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for (int i = 0; i < len; i++)
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{
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str.append(HEX.charAt(buf[i+off] >>> 4 & 0x0F));
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str.append(HEX.charAt(buf[i+off] & 0x0F));
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}
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return str.toString();
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}
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/**
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* See {@link #toHexString(byte[],int,int)}.
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*/
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public static String toHexString(byte[] buf)
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{
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return Util.toHexString(buf, 0, buf.length);
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}
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/**
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* Convert a byte array to a hexadecimal string, separating octets
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* with the given character.
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*
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* @param buf The bytes to format.
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* @param off The offset to start at.
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* @param len The number of bytes to format.
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* @param sep The character to insert between octets.
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* @return A hexadecimal representation of the specified bytes.
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*/
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public static String toHexString(byte[] buf, int off, int len, char sep)
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{
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CPStringBuilder str = new CPStringBuilder();
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for (int i = 0; i < len; i++)
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{
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str.append(HEX.charAt(buf[i+off] >>> 4 & 0x0F));
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str.append(HEX.charAt(buf[i+off] & 0x0F));
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if (i < len - 1)
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str.append(sep);
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}
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return str.toString();
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}
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/**
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* See {@link #toHexString(byte[],int,int,char)}.
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*/
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public static String toHexString(byte[] buf, char sep)
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{
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return Util.toHexString(buf, 0, buf.length, sep);
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}
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/**
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* Create a representation of the given byte array similar to the
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* output of `hexdump -C', which is
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*
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* <p><pre>OFFSET SIXTEEN-BYTES-IN-HEX PRINTABLE-BYTES</pre>
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*
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* <p>The printable bytes show up as-is if they are printable and
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* not a newline character, otherwise showing as '.'.
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*
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* @param buf The bytes to format.
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* @param off The offset to start at.
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* @param len The number of bytes to encode.
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* @return The formatted string.
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*/
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public static String hexDump(byte[] buf, int off, int len, String prefix)
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{
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String nl = System.getProperty("line.separator");
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CPStringBuilder str = new CPStringBuilder();
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int i = 0;
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while (i < len)
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{
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str.append(prefix);
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str.append(Util.formatInt(i+off, 16, 8));
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str.append(" ");
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String s = Util.toHexString(buf, i+off, Math.min(16, len-i), ' ');
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str.append(s);
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for (int j = 56 - (56 - s.length()); j < 56; j++)
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str.append(" ");
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for (int j = 0; j < Math.min(16, len - i); j++)
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{
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if ((buf[i+off+j] & 0xFF) < 0x20 || (buf[i+off+j] & 0xFF) > 0x7E)
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str.append('.');
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else
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str.append((char) (buf[i+off+j] & 0xFF));
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}
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str.append(nl);
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i += 16;
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}
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return str.toString();
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}
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/**
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* See {@link #hexDump(byte[],int,int,String)}.
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*/
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public static String hexDump(byte[] buf, String prefix)
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{
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return hexDump(buf, 0, buf.length, prefix);
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}
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/**
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* Format an integer into the specified radix, zero-filled.
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*
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* @param i The integer to format.
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* @param radix The radix to encode to.
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* @param len The target length of the string. The string is
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* zero-padded to this length, but may be longer.
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* @return The formatted integer.
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*/
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public static String formatInt(int i, int radix, int len)
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{
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String s = Integer.toString(i, radix);
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CPStringBuilder buf = new CPStringBuilder();
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for (int j = 0; j < len - s.length(); j++)
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buf.append("0");
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buf.append(s);
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return buf.toString();
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}
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/**
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* Convert a hexadecimal string into its byte representation.
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*
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* @param hex The hexadecimal string.
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* @return The converted bytes.
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*/
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public static byte[] toByteArray(String hex)
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{
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hex = hex.toLowerCase();
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byte[] buf = new byte[hex.length() / 2];
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int j = 0;
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for (int i = 0; i < buf.length; i++)
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{
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buf[i] = (byte) ((Character.digit(hex.charAt(j++), 16) << 4) |
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Character.digit(hex.charAt(j++), 16));
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}
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return buf;
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}
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}
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