error occured when parsing a 'N' type field which is mistakenly defined as ‘C'

[AlanGuoo]

hi,

When I was trying to read a dbf file, I found that when the dbf file has a wrong field type definition, it cannot read the data correctly.
e.g.
the blfm2 is actually filled with float, but it was mistakenly defined as 'C' type. If correctly parsed with the follwing method (dbf.py line 122)
self._read_field_headers(infile)

def _read_field_headers(self, infile):
        while True:
            sep = infile.read(1)
            if sep in (b'\r', b'\n', b''):
                # End of field headers
                break

            field = DBFField.unpack(sep + infile.read(DBFField.size - 1))

            field.type = chr(ord(field.type))

            # For character fields > 255 bytes the high byte
            # is stored in decimal_count.
            if field.type in 'C':
                field.length |= field.decimal_count << 8
                field.decimal_count = 0

            # Field name is b'\0' terminated.
            field.name = self._decode_text(field.name.split(b'\0')[0])
            if self.lowernames:
                field.name = field.name.lower()

            self.field_names.append(field.name)

            self.fields.append(field)

it should produce DBFField like:
DBFField(name='blfm2', type='C', address=196, length=17, decimal_count=12,

But the it turns out to be

DBFField(name='blfm2', type='C', address=196, length=3072, decimal_count=0

I think the problem is here:

            # For character fields > 255 bytes the high byte
            # is stored in decimal_count.
            if field.type in 'C':
                field.length |= field.decimal_count << 8
                field.decimal_count = 0

After I removed these lines, I finally got the correct result.