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/*
* Copyright (c) 2010, 2020 Oracle and/or its affiliates. All rights reserved.
* 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 org.glassfish.grizzly.http.util;
import org.glassfish.grizzly.Buffer;
/**
* 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 INT_OVERFLOW_LIMIT = Integer.MAX_VALUE / 10;
private static final long LONG_OVERFLOW_LIMIT = Long.MAX_VALUE / 10;
/**
* All possible chars for representing a number as a String
*/
final static char[] digits = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o',
'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z' };
/**
* Returns the upper case equivalent of the specified ASCII character.
*/
public static int toUpper(int c) {
return c >= 'a' && c <= 'z' ? c + 'A' - 'a' : c & 0xff;
}
/**
* Converts passed bytes (representing ASCII characters) to the upper case equivalent.
*/
public static void toUpper(final byte[] bytes) {
for (int i = 0; i < bytes.length; i++) {
byte b = bytes[i];
bytes[i] = (byte) (b >= 'a' && b <= 'z' ? b + 'A' - 'a' : b);
}
}
/**
* Returns the lower case equivalent of the specified ASCII character.
*/
public static int toLower(int c) {
return c >= 'A' && c <= 'Z' ? c - 'A' + 'a' : c & 0xff;
}
/**
* Converts passed bytes (representing ASCII characters) to the lower case equivalent.
*/
public static void toLower(final byte[] bytes) {
for (int i = 0; i < bytes.length; i++) {
byte b = bytes[i];
bytes[i] = (byte) (b >= 'A' && b <= 'Z' ? b - 'A' + 'a' : b);
}
}
/**
* Returns true if the specified ASCII character is upper or lower case.
*/
public static boolean isAlpha(int c) {
return c >= 'a' && c <= 'z' || c >= 'A' && c <= 'Z';
}
/**
* Returns true if the specified ASCII character is upper case.
*/
public static boolean isUpper(int c) {
return c >= 'A' && c <= 'Z';
}
/**
* Returns true if the specified ASCII character is lower case.
*/
public static boolean isLower(int c) {
return c >= 'a' && c <= 'z';
}
/**
* Returns true if the specified ASCII character is white space.
*/
public static boolean isWhite(int c) {
return c == ' ' || c == '\t' || c == '\r' || c == '\n' || c == '\f' || c == '\b';
}
/**
* Returns true if the specified ASCII character is a digit.
*/
public static boolean isDigit(int c) {
return c >= '0' && c <= '9';
}
/**
* Parses an unsigned integer from the specified {@link DataChunk}.
*
* @param dataChunk the {@link DataChunk}
* @exception NumberFormatException if the integer format was invalid
*/
public static int parseInt(final DataChunk dataChunk) {
switch (dataChunk.getType()) {
case Buffer:
final BufferChunk bc = dataChunk.getBufferChunk();
return parseInt(bc.getBuffer(), bc.getStart(), bc.getLength());
case String:
return Integer.parseInt(dataChunk.toString());
case Chars:
final CharChunk cc = dataChunk.getCharChunk();
return parseInt(cc.getBuffer(), cc.getStart(), cc.getLength());
default:
throw new NullPointerException();
}
}
/**
* Parses an unsigned integer from the specified part of {@link DataChunk}.
*
* @param dataChunk the {@link DataChunk}
* @param offset the start offset
* @param length the length
* @exception NumberFormatException if the integer format was invalid
*/
public static int parseInt(final DataChunk dataChunk, final int offset, final int length) {
switch (dataChunk.getType()) {
case Buffer:
final BufferChunk bc = dataChunk.getBufferChunk();
return parseInt(bc.getBuffer(), bc.getStart() + offset, length);
case String:
return parseInt(dataChunk.toString(), offset, length);
case Chars:
final CharChunk cc = dataChunk.getCharChunk();
return parseInt(cc.getBuffer(), cc.getStart() + offset, cc.getLength());
default:
throw new NullPointerException();
}
}
/**
* Parses an unsigned integer from the specified sub-array 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 int from the specified sub-array of bytes.
*
* @param b the Buffer 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 int parseInt(Buffer b, int off, int len) throws NumberFormatException {
int c;
if (b == null || len <= 0 || !isDigit(c = b.get(off++))) {
throw new NumberFormatException();
}
int n = c - '0';
while (--len > 0) {
if (!isDigit(c = b.get(off++))) {
throw new NumberFormatException();
}
n = n * 10 + c - '0';
}
return n;
}
public static int parseInt(String s, int off, int len) throws NumberFormatException {
int c;
if (s == null || len <= 0 || !isDigit(c = s.charAt(off++))) {
throw new NumberFormatException();
}
int n = c - '0';
while (--len > 0) {
if (isDigit(c = s.charAt(off++)) && (n < INT_OVERFLOW_LIMIT || n == INT_OVERFLOW_LIMIT && c - '0' < 8)) {
n = n * 10 + c - '0';
} else {
throw new NumberFormatException();
}
}
return n;
}
/**
* Parses an unsigned long from the specified sub-array 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 < LONG_OVERFLOW_LIMIT || n == LONG_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 < LONG_OVERFLOW_LIMIT || n == LONG_OVERFLOW_LIMIT && c - '0' < 8)) {
n = n * 10 + c - '0';
} else {
throw new NumberFormatException();
}
}
return n;
}
public static long parseLong(String s, int off, int len) throws NumberFormatException {
int c;
if (s == null || len <= 0 || !isDigit(c = s.charAt(off++))) {
throw new NumberFormatException();
}
long n = c - '0';
while (--len > 0) {
if (isDigit(c = s.charAt(off++)) && (n < LONG_OVERFLOW_LIMIT || n == LONG_OVERFLOW_LIMIT && c - '0' < 8)) {
n = n * 10 + c - '0';
} else {
throw new NumberFormatException();
}
}
return n;
}
/**
* Parses an unsigned long from the specified sub-array of bytes.
*
* @param b the Buffer 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(Buffer b, int off, int len) throws NumberFormatException {
int c;
if (b == null || len <= 0 || !isDigit(c = b.get(off++))) {
throw new NumberFormatException();
}
long n = c - '0';
while (--len > 0) {
if (isDigit(c = b.get(off++)) && (n < LONG_OVERFLOW_LIMIT || n == LONG_OVERFLOW_LIMIT && c - '0' < 8)) {
n = n * 10 + c - '0';
} else {
throw new NumberFormatException();
}
}
return n;
}
public static long parseLong(final DataChunk dataChunk) {
switch (dataChunk.getType()) {
case Buffer:
final BufferChunk bc = dataChunk.getBufferChunk();
return parseLong(bc.getBuffer(), bc.getStart(), bc.getLength());
case String:
return Long.parseLong(dataChunk.toString());
case Chars:
final CharChunk cc = dataChunk.getCharChunk();
return parseLong(cc.getBuffer(), cc.getStart(), cc.getLength());
default:
throw new NullPointerException();
}
}
public static long parseLong(final DataChunk dataChunk, final int offset, final int length) {
switch (dataChunk.getType()) {
case Buffer:
final BufferChunk bc = dataChunk.getBufferChunk();
return parseLong(bc.getBuffer(), bc.getStart() + offset, length);
case String:
return parseLong(dataChunk.toString(), offset, length);
case Chars:
final CharChunk cc = dataChunk.getCharChunk();
return parseLong(cc.getBuffer(), cc.getStart() + offset, cc.getLength());
default:
throw new NullPointerException();
}
}
public static void intToHexString(Buffer buffer, int i) {
intToUnsignedString(buffer, i, 4);
}
/**
* Convert the integer to an unsigned number.
*/
public static void intToUnsignedString(Buffer buffer, int value, int shift) {
if (value == 0) {
buffer.put((byte) '0');
return;
}
int currentShift = 32 - shift;
int radix = 1 << shift;
int mask = radix - 1 << currentShift;
boolean initialZeros = true;
while (mask != 0) {
final int digit = (value & mask) >>> currentShift;
if (digit != 0 || !initialZeros) {
buffer.put((byte) digits[digit]);
initialZeros = false;
}
mask >>>= shift;
currentShift -= shift;
}
}
}
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