JAVA工具【三】Radix进制切换-最大支持64进制

进制的转换与解析，最大支持64进制

public class Radix {
private 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' ,
'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' , '+' , '/', '[' , ']'
};
private static final int ASCII_SIZE = 128;
private static final int[] DIGITS_INDEX = new int[ASCII_SIZE];
private static final char BLANK_CHAR = '0';
/**
* 进制数
*/
@Getter
protected int radix;
/**
* 空白补充字符
*/
@Getter
protected char blankChar;
public static final int MAX_RADIX = 66;
public static final int MIN_RADIX = 2;
/**
* 进制最大的字符
*/
@Getter
protected char maxChar;
static {
for (int i = 0; i < ASCII_SIZE; i++) {
DIGITS_INDEX[i] = -1;
}
for (int i = 0; i < digits.length; i++) {
DIGITS_INDEX[digits[i]] = i;
}
}
public static final Radix Radix10 = new Radix(10);
public static final Radix Radix16 = new Radix(16);
public static final Radix Radix32 = new Radix(32);
public static final Radix Radix36 = new Radix(36);
public static final Radix Radix62 = new Radix(62);
public static final Radix Radix64 = new Radix(64);
public static final Radix Radix66 = new Radix(66);
public Radix(int radix){
if (radix < MIN_RADIX) {
throw new NumberFormatException("radix " + radix + " less than MIN_RADIX");
}
if (radix > MAX_RADIX) {
throw new NumberFormatException("radix " + radix + " greater than MAX_RADIX");
}
this.radix = radix;
this.blankChar = BLANK_CHAR;
this.maxChar = digits[radix - 1];
}
public String toRadixWithBlank(long value, long length) throws DataException {
String dest = toRadix(value);
if(dest.length() > length){
throw new DataException("结果超过最大长度");
}
if (dest.length() < length) {
dest = this.getRepeatStr(blankChar, length - dest.length()) + dest;
}
return dest;
}
public long toDecimal(String value) throws DataException {
return parseLong(value, radix);
}
public long getMaxValue(long bit) throws DataException {
String value = this.getRepeatStr(maxChar, bit);
return parseLong(value, radix);
}
private String getRepeatStr(char value, long length){
StringBuilder builder = new StringBuilder();
for(int i = 0; i < length; i ++){
builder.append(value);
}
return builder.toString();
}
public String toRadix(long i) {
if (radix == 10)
return Long.toString(i);
char[] buf = new char[65];
int charPos = 64;
boolean negative = (i < 0);
if (!negative) {
i = -i;
}
while (i <= -radix) {
buf[charPos--] = digits[(int)(-(i % radix))];
i = i / radix;
}
buf[charPos] = digits[(int)(-i)];
if (negative) {
buf[--charPos] = '-';
}
return new String(buf, charPos, (65 - charPos));
}
private long parseLong(String s, int radix) throws NumberFormatException
{
if (s == null) {
throw new NumberFormatException("null");
}
if (radix < MIN_RADIX) {
throw new NumberFormatException("radix " + radix + " less than MIN_RADIX");
}
if (radix > MAX_RADIX) {
throw new NumberFormatException("radix " + radix + " greater than MAX_RADIX");
}
long result = 0;
boolean negative = false;
int i = 0, len = s.length();
long limit = -Long.MAX_VALUE;
long multmin;
int digit;
if (len > 0) {
char firstChar = s.charAt(0);
if (firstChar < '0') { // Possible leading "+" or "-"
if (firstChar == '-') {
negative = true;
limit = Long.MIN_VALUE;
} else if (firstChar != '+')
throw new NumberFormatException("For input string: "" + s + """);
if (len == 1) // Cannot have lone "+" or "-"
throw new NumberFormatException("For input string: "" + s + """);
i++;
}
multmin = limit / radix;
while (i < len) {
// Accumulating negatively avoids surprises near MAX_VALUE
digit = DIGITS_INDEX[s.charAt(i++)];
if (digit < 0) {
throw new NumberFormatException("For input string: "" + s + """);
}
if (digit >= radix) {
throw new NumberFormatException("For input string: "" + s + """);
}
if (result < multmin) {
throw new NumberFormatException("For input string: "" + s + """);
}
result *= radix;
if (result < limit + digit) {
throw new NumberFormatException("For input string: "" + s + """);
}
result -= digit;
}
} else {
throw new NumberFormatException("For input string: "" + s + """);
}
return negative ? result : -result;
}
}

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