mirror of git://gcc.gnu.org/git/gcc.git
496 lines
15 KiB
Java
496 lines
15 KiB
Java
/* Util.java -- Miscellaneous utility methods.
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Copyright (C) 2006 Free Software Foundation, Inc.
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This file is a 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 of the License, or (at
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your option) 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; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
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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.javax.net.ssl.provider;
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import gnu.java.lang.CPStringBuilder;
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import java.io.PrintWriter;
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import java.io.StringWriter;
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import java.lang.reflect.Array;
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import java.lang.reflect.InvocationTargetException;
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import java.lang.reflect.Method;
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import java.math.BigInteger;
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import java.nio.ByteBuffer;
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import java.security.AccessController;
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import java.security.PrivilegedAction;
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import java.security.Security;
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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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static final String HEX = "0123456789abcdef";
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// Static methods only.
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private Util() { }
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// Class methods.
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// -------------------------------------------------------------------------
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public static Object wrapBuffer(ByteBuffer buffer)
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{
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return wrapBuffer(buffer, "");
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}
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public static Object wrapBuffer(ByteBuffer buffer, String prefix)
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{
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return new WrappedBuffer(buffer, prefix);
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}
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private static class WrappedBuffer
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{
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private final ByteBuffer buffer;
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private final String prefix;
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WrappedBuffer(ByteBuffer buffer, String prefix)
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{
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this.buffer = buffer;
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this.prefix = prefix;
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}
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public String toString()
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{
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return hexDump(buffer, prefix);
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}
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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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* 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 <code>`hexdump -C'</code>, 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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* @param prefix A string to prepend to every line.
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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 = 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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if (prefix != null)
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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 = s.length(); j < 49; 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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public static String hexDump (ByteBuffer buf)
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{
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return hexDump (buf, null);
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}
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public static String hexDump (ByteBuffer buf, String prefix)
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{
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buf = buf.duplicate();
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StringWriter str = new StringWriter ();
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PrintWriter out = new PrintWriter (str);
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int i = 0;
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int len = buf.remaining();
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byte[] line = new byte[16];
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while (i < len)
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{
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if (prefix != null)
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out.print(prefix);
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out.print(Util.formatInt (i, 16, 8));
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out.print(" ");
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int l = Math.min(16, len - i);
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buf.get(line, 0, l);
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String s = Util.toHexString(line, 0, l, ' ');
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out.print(s);
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for (int j = s.length(); j < 49; j++)
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out.print(' ');
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for (int j = 0; j < l; j++)
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{
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int c = line[j] & 0xFF;
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if (c < 0x20 || c > 0x7E)
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out.print('.');
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else
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out.print((char) c);
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}
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out.println();
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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, int off, int len)
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{
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return hexDump(buf, off, len, "");
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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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* See {@link #hexDump(byte[],int,int,String)}.
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*/
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public static String hexDump(byte[] buf)
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{
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return hexDump(buf, 0, buf.length);
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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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* Concatenate two byte arrays into one.
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*
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* @param b1 The first byte array.
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* @param b2 The second byte array.
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* @return The concatenation of b1 and b2.
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*/
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public static byte[] concat(byte[] b1, byte[] b2)
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{
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byte[] b3 = new byte[b1.length+b2.length];
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System.arraycopy(b1, 0, b3, 0, b1.length);
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System.arraycopy(b2, 0, b3, b1.length, b2.length);
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return b3;
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}
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/**
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* See {@link #trim(byte[],int,int)}.
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*/
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public static byte[] trim(byte[] buffer, int len)
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{
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return trim(buffer, 0, len);
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}
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/**
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* Returns a portion of a byte array, possibly zero-filled.
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*
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* @param buffer The byte array to trim.
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* @param off The offset to begin reading at.
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* @param len The number of bytes to return. This value can be larger
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* than <i>buffer.length - off</i>, in which case the rest of the
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* returned byte array will be filled with zeros.
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* @throws IndexOutOfBoundsException If <i>off</i> or <i>len</i> is
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* negative, or if <i>off</i> is larger than the byte array's
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* length.
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* @return The trimmed byte array.
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*/
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public static byte[] trim(byte[] buffer, int off, int len)
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{
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if (off < 0 || len < 0 || off > buffer.length)
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throw new IndexOutOfBoundsException("max=" + buffer.length +
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" off=" + off + " len=" + len);
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if (off == 0 && len == buffer.length)
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return buffer;
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byte[] b = new byte[len];
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System.arraycopy(buffer, off, b, 0, Math.min(len, buffer.length - off));
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return b;
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}
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/**
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* Returns the byte array representation of the given big integer with
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* the leading zero byte (if any) trimmed off.
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*
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* @param bi The integer to trim.
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* @return The byte representation of the big integer, with any leading
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* zero removed.
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*/
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public static byte[] trim(BigInteger bi)
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{
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byte[] buf = bi.toByteArray();
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if (buf[0] == 0x00 && !bi.equals(BigInteger.ZERO))
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{
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return trim(buf, 1, buf.length - 1);
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}
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else
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{
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return buf;
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}
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}
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/**
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* Returns the integer value of <code>{@link
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* java.lang.System#currentTimeMillis()} / 1000</code>.
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*
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* @return The current time, in seconds.
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*/
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public static int unixTime()
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{
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return (int) (System.currentTimeMillis() / 1000L);
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}
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/**
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* Transform an Object array into another by calling the given method
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* on each object. The returned object array will have the runtime
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* type of <i>returnType</i>. For example, the following will transform
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* array of objects into their String representations, returning a String
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* array. For example:
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*
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* <blockquote><p><code>
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* String[] strings = (String[]) Util.transform(array, String.class,
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* "toString", null);
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* </code></p></blockquote>
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*
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* <p>If any element of the given array is <tt>null</tt>, then that
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* entry in the returned array will also be <tt>null</tt>.
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*
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* @param array The array to transform. It does not need to be of
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* uniform type.
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* @param returnType The desired return type of the returned array.
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* This must by the <i>component</i> type, not the array type.
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* @param method The name of the method to invoke from each object.
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* @param args The arguments to pass to the method, or <tt>null</tt>
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* if the method takes no arguments.
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* @throws InvocationTargetException If an exception occurs while
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* calling <i>method</i> of any object.
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* @throws NoSuchMethodException If <i>method</i> is not the name of
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* a valid method of any component of the array.
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* @throws ClassCastException If the returned object from the method
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* is not assignable to the return type.
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* @throws IllegalArgumentException If <i>args</i> is not appropriate
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* for <i>method</i>
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* @throws IllegalAccessException If <i>method</i> is not accessible.
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* @throws SecurityException If <i>method</i> is not accessible.
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* @return An array containing the output of <i>method</i> called on
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* each element of <i>array</i> with <i>args</i>. The return type
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* of the array will be an array of <i>returnType</i>.
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*/
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static Object[] transform(Object[] array, Class returnType,
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String method, Object[] args)
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throws InvocationTargetException, NoSuchMethodException,
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IllegalAccessException
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{
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if (args == null)
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args = new Object[0];
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Object[] result = (Object[]) Array.newInstance(returnType, array.length);
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Class[] argsClasses = new Class[args.length];
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for (int i = 0; i < args.length; i++)
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{
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argsClasses[i] = args[i].getClass();
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}
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for (int i = 0; i < array.length; i++)
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{
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if (array[i] == null)
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{
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result[i] = null;
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continue;
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}
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Class objClass = array[i].getClass();
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Method objMethod = objClass.getMethod(method, argsClasses);
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Object o = objMethod.invoke(array[i], args);
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if (!returnType.isAssignableFrom(o.getClass()))
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throw new ClassCastException();
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result[i] = o;
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}
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return result;
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}
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/**
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* Get a system property as a privileged action.
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*
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* @param name The name of the property to get.
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* @return The property named <i>name</i>, or null if the property is
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* not set.
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* @throws SecurityException If the Jessie code still does not have
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* permission to read the property.
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*/
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@Deprecated static String getProperty(final String name)
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{
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return (String) AccessController.doPrivileged(
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new PrivilegedAction()
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{
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public Object run()
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{
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return System.getProperty(name);
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}
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}
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);
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}
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/**
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* Get a security property as a privileged action.
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*
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* @param name The name of the property to get.
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* @return The property named <i>name</i>, or null if the property is
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* not set.
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* @throws SecurityException If the Jessie code still does not have
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* permission to read the property.
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*/
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@Deprecated static String getSecurityProperty(final String name)
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{
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return (String) AccessController.doPrivileged(
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new PrivilegedAction()
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{
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public Object run()
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{
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return Security.getProperty(name);
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}
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}
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);
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}
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}
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