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* you may not use this file except in compliance with the License.
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package com.pdd.pop.ext.glassfish.grizzly.http.util;
import com.pdd.pop.ext.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;
}
}
}