ASCII Utility
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can obtain
* a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
* or glassfish/bootstrap/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
* Sun designates this particular file as subject to the "Classpath" exception
* as provided by Sun in the GPL Version 2 section of the License file that
* accompanied this code. If applicable, add the following below the License
* Header, with the fields enclosed by brackets [] replaced by your own
* identifying information: "Portions Copyrighted [year]
* [name of copyright owner]"
*
* Contributor(s):
*
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*/
/*
* @(#)ASCIIUtility.java 1.11 07/05/04
*/
class ASCIIUtility {
// Private constructor so that this class is not instantiated
private ASCIIUtility() { }
/**
* Convert the bytes within the specified range of the given byte
* array into a signed integer in the given radix . The range extends
* from <code>start</code> till, but not including <code>end</code>. <p>
*
* Based on java.lang.Integer.parseInt()
*/
public static int parseInt(byte[] b, int start, int end, int radix)
throws NumberFormatException {
if (b == null)
throw new NumberFormatException("null");
int result = 0;
boolean negative = false;
int i = start;
int limit;
int multmin;
int digit;
if (end > start) {
if (b[i] == '-') {
negative = true;
limit = Integer.MIN_VALUE;
i++;
} else {
limit = -Integer.MAX_VALUE;
}
multmin = limit / radix;
if (i < end) {
digit = Character.digit((char)b[i++], radix);
if (digit < 0) {
throw new NumberFormatException(
"illegal number: " + toString(b, start, end)
);
} else {
result = -digit;
}
}
while (i < end) {
// Accumulating negatively avoids surprises near MAX_VALUE
digit = Character.digit((char)b[i++], radix);
if (digit < 0) {
throw new NumberFormatException("illegal number");
}
if (result < multmin) {
throw new NumberFormatException("illegal number");
}
result *= radix;
if (result < limit + digit) {
throw new NumberFormatException("illegal number");
}
result -= digit;
}
} else {
throw new NumberFormatException("illegal number");
}
if (negative) {
if (i > start + 1) {
return result;
} else { /* Only got "-" */
throw new NumberFormatException("illegal number");
}
} else {
return -result;
}
}
/**
* Convert the bytes within the specified range of the given byte
* array into a signed integer . The range extends from
* <code>start</code> till, but not including <code>end</code>. <p>
*/
public static int parseInt(byte[] b, int start, int end)
throws NumberFormatException {
return parseInt(b, start, end, 10);
}
/**
* Convert the bytes within the specified range of the given byte
* array into a signed long in the given radix . The range extends
* from <code>start</code> till, but not including <code>end</code>. <p>
*
* Based on java.lang.Long.parseLong()
*/
public static long parseLong(byte[] b, int start, int end, int radix)
throws NumberFormatException {
if (b == null)
throw new NumberFormatException("null");
long result = 0;
boolean negative = false;
int i = start;
long limit;
long multmin;
int digit;
if (end > start) {
if (b[i] == '-') {
negative = true;
limit = Long.MIN_VALUE;
i++;
} else {
limit = -Long.MAX_VALUE;
}
multmin = limit / radix;
if (i < end) {
digit = Character.digit((char)b[i++], radix);
if (digit < 0) {
throw new NumberFormatException(
"illegal number: " + toString(b, start, end)
);
} else {
result = -digit;
}
}
while (i < end) {
// Accumulating negatively avoids surprises near MAX_VALUE
digit = Character.digit((char)b[i++], radix);
if (digit < 0) {
throw new NumberFormatException("illegal number");
}
if (result < multmin) {
throw new NumberFormatException("illegal number");
}
result *= radix;
if (result < limit + digit) {
throw new NumberFormatException("illegal number");
}
result -= digit;
}
} else {
throw new NumberFormatException("illegal number");
}
if (negative) {
if (i > start + 1) {
return result;
} else { /* Only got "-" */
throw new NumberFormatException("illegal number");
}
} else {
return -result;
}
}
/**
* Convert the bytes within the specified range of the given byte
* array into a signed long . The range extends from
* <code>start</code> till, but not including <code>end</code>. <p>
*/
public static long parseLong(byte[] b, int start, int end)
throws NumberFormatException {
return parseLong(b, start, end, 10);
}
/**
* Convert the bytes within the specified range of the given byte
* array into a String. The range extends from <code>start</code>
* till, but not including <code>end</code>. <p>
*/
public static String toString(byte[] b, int start, int end) {
int size = end - start;
char[] theChars = new char[size];
for (int i = 0, j = start; i < size; )
theChars[i++] = (char)(b[j++]&0xff);
return new String(theChars);
}
public static String toString(ByteArrayInputStream is) {
int size = is.available();
char[] theChars = new char[size];
byte[] bytes = new byte[size];
is.read(bytes, 0, size);
for (int i = 0; i < size;)
theChars[i] = (char)(bytes[i++]&0xff);
return new String(theChars);
}
public static byte[] getBytes(String s) {
char [] chars= s.toCharArray();
int size = chars.length;
byte[] bytes = new byte[size];
for (int i = 0; i < size;)
bytes[i] = (byte) chars[i++];
return bytes;
}
public static byte[] getBytes(InputStream is) throws IOException {
int len;
int size = 1024;
byte [] buf;
if (is instanceof ByteArrayInputStream) {
size = is.available();
buf = new byte[size];
len = is.read(buf, 0, size);
}
else {
ByteArrayOutputStream bos = new ByteArrayOutputStream();
buf = new byte[size];
while ((len = is.read(buf, 0, size)) != -1)
bos.write(buf, 0, len);
buf = bos.toByteArray();
}
return buf;
}
}
Related examples in the same category
