bits to byte

// returns numeric value given a string of 0's and 1's representing bits
// - any characters other than '0' or '1' are ignored
// - string should have most significat bit first
function bitsToNum(str) {
    var val = 0;
    for (var i=str.length-1, bit=0; i>=0; i--) {
        if (str.charAt(i)=='1') val |= 1<<bit++;
        else if (str.charAt(i)=='0') bit++;
        //else: ignore
    }
    return val;
}
                

// returns numeric value given a string of 0's and 1's representing bits
// - any characters other than '0' or '1' are ignored
// - string should have most significat bit first
function bitsToNum($str) {
    $val = 0;
    for ($i=strlen($str)-1, $bit=0; $i>=0; $i--) {
        if ($str{$i}=='1') $val |= 1<<$bit++;
        else if ($str{$i}=='0') $bit++;
        //else: ignore
    }
    return $val;
}
                

// returns numeric value given a string of 0's and 1's representing bits
// - any characters other than '0' or '1' are ignored
// - string should have most significat bit first
public int bitsToNum(String str) {
    int val = 0;
    for (int i=str.length()-1, bit=0; i>=0; i--) {
        if (str.charAt(i)=='1') val |= 1<<bit++;
        else if (str.charAt(i)=='0') bit++;
        //else: ignore
    }
    return val;
}
                

// returns numeric value given a string of 0's and 1's representing bits
// - any characters other than '0' or '1' are ignored
// - string should have most significat bit first
unsigned int bitsToNum(char *str) {
    unsigned int val = 0;
    for (int i=strlen(str), bit=0; i>=0; i--) {
        if (str[i]=='1') val |= 1<<bit++;
        else if (str[i]=='0') bit++;
        //else: ignore
    }
    return val;
}