Source code for objutils.cosmac

#!/usr/bin/env python

__version__ = "0.1.0"

__copyright__ = """
    objutils - Object file library for Python.

   (C) 2010-2024 by Christoph Schueler <cpu12.gems@googlemail.com>

   All Rights Reserved

  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2 of the License, or
  (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License along
  with this program; if not, write to the Free Software Foundation, Inc.,
  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
"""

import objutils.hexfile as hexfile


DATA0 = 1
DATA1 = 2
DATA2 = 3
DATA3 = 4



[docs]
class Reader(hexfile.Reader):
    FORMAT_SPEC = (
        (DATA0, r"!MAAAA DD"),
        (DATA1, r"\?MAAAA DD"),
        (DATA2, r"AAAA DD"),
        (DATA3, r"DD"),
    )
    previous_address = 0
    previous_length = 0


[docs]
    def check_line(self, line, format_type):
        return True



[docs]
    def is_data_line(self, line, format_type):
        if format_type == DATA3:
            if line.junk in ("!M", "?M"):  # Startsymbol, address ommited.
                return False
            line.address = self.previous_address + self.previous_length
            self.previous_address = line.address
            self.previous_length = len(line.chunk)
        else:
            if hasattr(line, "chunk"):
                length = len(line.chunk)
            else:
                length = 0
            self.previous_address = line.address
            self.previous_length = length
        return format_type in (DATA0, DATA1, DATA2, DATA3)





[docs]
class Writer(hexfile.Writer):
    MAX_ADDRESS_BITS = 16


[docs]
    def compose_row(self, address, length, row):
        line = f"!M{address:04X} {Writer.hex_bytes(row)}"
        return line