Function unhex

Lib/quopri.py:170–184

Get the integer value of a hexadecimal number.

(s)

    return b'0' <= c <= b'9' or b'a' <= c <= b'f' or b'A' <= c <= b'F'

def unhex(s):
    """Get the integer value of a hexadecimal number."""
    bits = 0
    for c in s:
        c = bytes((c,))
        if b'0' <= c <= b'9':
            i = ord('0')
        elif b'a' <= c <= b'f':
            i = ord('a')-10
        elif b'A' <= c <= b'F':
            i = ord(b'A')-10
        else:
            assert False, "non-hex digit "+repr(c)
        bits = bits*16 + (ord(c) - i)
    return bits