Java Hex Convert To fromHex(String s, boolean hexIsDefault)

Description

from Hex

License

Open Source License

Declaration

public static int fromHex(String s, boolean hexIsDefault) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

public class Main {
    private static final String hexReprPrefix = "0x";

    public static int fromHex(String s, boolean hexIsDefault) {
        int radix = hexIsDefault ? 16 : 10;
        int res = 0;
        int pos = 0;
        int sign = 1;
        if (s.charAt(0) == '-') {
            pos += 1;/*from w ww.j a  v a 2  s.c  o  m*/
            sign = -1;
        }
        if ((!hexIsDefault) && s.regionMatches(pos, hexReprPrefix, 0, 2)) {
            pos += 2;
            radix = 16;
        }
        int max = s.length();
        for (; pos < max; pos++) {
            int d = toDigit(s.charAt(pos));
            //System.out.println( "from hex " + s + " dig " + s.charAt( pos ) + "=" + d ) ;
            if ((d < 0) || (radix <= d))
                return res;
            res = res * radix + d;
        }
        return res * sign;
    }

    public static int fromHex(String s) {
        return fromHex(s, true);
    }

    private static int toDigit(char c) {
        if (c >= '0' && c <= '9')
            return c - '0';
        if (c >= 'a' && c <= 'f')
            return c - 'a' + 10;
        if (c >= 'A' && c <= 'F')
            return c - 'A' + 10;
        return -1;
    }
}

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