Parser for signed overpunch values?

Question

I am working with some old data imports and came across a bunch of data from an external source that reports financial numbers with a signed overpunch. I\'ve seen alot, but

Answer 1

Zoned decimal is easy and requires no char manipulation.

private int ConvertOverpunch(byte[] number)
{
    // Works for EBCDIC or ASCII, all charsets
    int rtnVal = 0;
    for(int i = 0; i<number.length; i++)
    {
       int digit = 0x0f & number[i];
       rtnVal = (rtnVal * 10) + digit;
    }

    // Extract sign
    // This works in EBCDIC
    // Need to find out what your sign is in ASCII
    if(0xD0 & number[number.length-1])
    {
       rtnVal *= -1;
    }   

    return rtnVal;
}