com.sun.grizzly.util.buf.Ascii Maven / Gradle / Ivy
/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 2007-2014 Oracle and/or its affiliates. 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_1_1.html
* or packager/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 packager/legal/LICENSE.txt.
*
* GPL Classpath Exception:
* Oracle designates this particular file as subject to the "Classpath"
* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
*
* Modifications:
* If applicable, add the following below the License Header, with the fields
* enclosed by brackets [] replaced by your own identifying information:
* "Portions Copyright [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.
*
*
* This file incorporates work covered by the following copyright and
* permission notice:
*
* Copyright 2004 The Apache Software Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.sun.grizzly.util.buf;
/**
* This class implements some basic ASCII character handling functions.
*
* @author [email protected]
* @author James Todd [[email protected]]
*/
public final class Ascii {
private static final long OVERFLOW_LIMIT = Long.MAX_VALUE / 10;
/*
* Character translation tables.
*/
private static final byte[] toUpper = new byte[256];
private static final byte[] toLower = new byte[256];
/*
* Character type tables.
*/
private static final boolean[] isAlpha = new boolean[256];
private static final boolean[] isUpper = new boolean[256];
private static final boolean[] isLower = new boolean[256];
private static final boolean[] isWhite = new boolean[256];
private static final boolean[] isDigit = new boolean[256];
/*
* Initialize character translation and type tables.
*/
static {
for (int i = 0; i < 256; i++) {
toUpper[i] = (byte)i;
toLower[i] = (byte)i;
}
for (int lc = 'a'; lc <= 'z'; lc++) {
int uc = lc + 'A' - 'a';
toUpper[lc] = (byte)uc;
toLower[uc] = (byte)lc;
isAlpha[lc] = true;
isAlpha[uc] = true;
isLower[lc] = true;
isUpper[uc] = true;
}
isWhite[ ' '] = true;
isWhite['\t'] = true;
isWhite['\r'] = true;
isWhite['\n'] = true;
isWhite['\f'] = true;
isWhite['\b'] = true;
for (int d = '0'; d <= '9'; d++) {
isDigit[d] = true;
}
}
/**
* Returns the upper case equivalent of the specified ASCII character.
*/
public static int toUpper(int c) {
return toUpper[c & 0xff] & 0xff;
}
/**
* Returns the lower case equivalent of the specified ASCII character.
*/
public static int toLower(int c) {
return toLower[c & 0xff] & 0xff;
}
/**
* Returns true if the specified ASCII character is upper or lower case.
*/
public static boolean isAlpha(int c) {
return isAlpha[c & 0xff];
}
/**
* Returns true if the specified ASCII character is upper case.
*/
public static boolean isUpper(int c) {
return isUpper[c & 0xff];
}
/**
* Returns true if the specified ASCII character is lower case.
*/
public static boolean isLower(int c) {
return isLower[c & 0xff];
}
/**
* Returns true if the specified ASCII character is white space.
*/
public static boolean isWhite(int c) {
return isWhite[c & 0xff];
}
/**
* Returns true if the specified ASCII character is a digit.
*/
public static boolean isDigit(int c) {
return isDigit[c & 0xff];
}
/**
* Parses an unsigned integer from the specified subarray of bytes.
* @param b the bytes to parse
* @param off the start offset of the bytes
* @param len the length of the bytes
* @exception NumberFormatException if the integer format was invalid
*/
public static int parseInt(byte[] b, int off, int len)
throws NumberFormatException
{
int c;
if (b == null || len <= 0 || !isDigit(c = b[off++])) {
throw new NumberFormatException();
}
int n = c - '0';
while (--len > 0) {
if (!isDigit(c = b[off++])) {
throw new NumberFormatException();
}
n = n * 10 + c - '0';
}
return n;
}
public static int parseInt(char[] b, int off, int len)
throws NumberFormatException
{
int c;
if (b == null || len <= 0 || !isDigit(c = b[off++])) {
throw new NumberFormatException();
}
int n = c - '0';
while (--len > 0) {
if (!isDigit(c = b[off++])) {
throw new NumberFormatException();
}
n = n * 10 + c - '0';
}
return n;
}
/**
* Parses an unsigned long from the specified subarray of bytes.
* @param b the bytes to parse
* @param off the start offset of the bytes
* @param len the length of the bytes
* @exception NumberFormatException if the long format was invalid
*/
public static long parseLong(byte[] b, int off, int len)
throws NumberFormatException
{
int c;
if (b == null || len <= 0 || !isDigit(c = b[off++])) {
throw new NumberFormatException();
}
long n = c - '0';
while (--len > 0) {
if (isDigit(c = b[off++])
&& (n < OVERFLOW_LIMIT || (n == OVERFLOW_LIMIT && (c - '0') < 8))) {
n = n * 10 + c - '0';
} else {
throw new NumberFormatException();
}
}
return n;
}
public static long parseLong(char[] b, int off, int len)
throws NumberFormatException
{
int c;
if (b == null || len <= 0 || !isDigit(c = b[off++])) {
throw new NumberFormatException();
}
long n = c - '0';
while (--len > 0) {
if (isDigit(c = b[off++])
&& (n < OVERFLOW_LIMIT || (n == OVERFLOW_LIMIT && (c - '0') < 8))) {
n = n * 10 + c - '0';
} else {
throw new NumberFormatException();
}
}
return n;
}
}
© 2015 - 2024 Weber Informatics LLC | Privacy Policy