Here you can find the source of trim(BigInteger bi)
| Parameter | Description |
|---|---|
| bi | The integer to trim. |
static byte[] trim(BigInteger bi)
//package com.java2s; /* Util.java -- Miscellaneous utility methods. Copyright (C) 2003 Casey Marshall <rsdio@metastatic.org> /*from ww w . j a v a 2 s . c om*/ This file is a part of Jessie. Jessie is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. Jessie is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with Jessie; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA Linking this library statically or dynamically with other modules is making a combined work based on this library. Thus, the terms and conditions of the GNU General Public License cover the whole combination. As a special exception, the copyright holders of this library give you permission to link this library with independent modules to produce an executable, regardless of the license terms of these independent modules, and to copy and distribute the resulting executable under terms of your choice, provided that you also meet, for each linked independent module, the terms and conditions of the license of that module. An independent module is a module which is not derived from or based on this library. If you modify this library, you may extend this exception to your version of the library, but you are not obligated to do so. If you do not wish to do so, delete this exception statement from your version. */ import java.math.BigInteger; public class Main { /** * See {@link #trim(byte[],int,int)}. */ static byte[] trim(byte[] buffer, int len) { return trim(buffer, 0, len); } /** * Returns a portion of a byte array, possibly zero-filled. * * @param buffer The byte array to trim. * @param off The offset to begin reading at. * @param len The number of bytes to return. This value can be larger * than <i>buffer.length - off</i>, in which case the rest of the * returned byte array will be filled with zeros. * @throws IndexOutOfBoundsException If <i>off</i> or <i>len</i> is * negative, or if <i>off</i> is larger than the byte array's * length. * @return The trimmed byte array. */ static byte[] trim(byte[] buffer, int off, int len) { if (off < 0 || len < 0 || off > buffer.length) throw new IndexOutOfBoundsException("max=" + buffer.length + " off=" + off + " len=" + len); if (off == 0 && len == buffer.length) return buffer; byte[] b = new byte[len]; System.arraycopy(buffer, off, b, 0, Math.min(len, buffer.length - off)); return b; } /** * Returns the byte array representation of the given big integer with * the leading zero byte (if any) trimmed off. * * @param bi The integer to trim. * @return The byte representation of the big integer, with any leading * zero removed. */ static byte[] trim(BigInteger bi) { byte[] buf = bi.toByteArray(); if (buf[0] == 0x00 && !bi.equals(BigInteger.ZERO)) { return trim(buf, 1, buf.length - 1); } else { return buf; } } /** * Convert a hexadecimal string into its byte representation. * * @param hex The hexadecimal string. * @return The converted bytes. */ static byte[] toByteArray(String hex) { hex = hex.toLowerCase(); byte[] buf = new byte[hex.length() / 2]; int j = 0; for (int i = 0; i < buf.length; i++) { buf[i] = (byte) ((Character.digit(hex.charAt(j++), 16) << 4) | Character.digit(hex.charAt(j++), 16)); } return buf; } }