79 lines
2.3 KiB
Python
79 lines
2.3 KiB
Python
# Copyright (c) 2014-2024, Chris Pressey, Cat's Eye Technologies.
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# This file is distributed under a 2-clause BSD license. See LICENSES/ dir.
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# SPDX-License-Identifier: LicenseRef-BSD-2-Clause-X-SixtyPical
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"""Executable file writer."""
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from sixtypical.emitter import Emitter, Byte, Word
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class Outputter(object):
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def __init__(self, fh, start_addr=None):
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self.start_addr = self.__class__.start_addr
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if start_addr is not None:
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self.start_addr = start_addr
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self.prelude = self.__class__.prelude
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self.fh = fh
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self.emitter = Emitter(self.start_addr)
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def write_header(self):
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pass
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def write_prelude(self):
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self.write_header()
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for byte in self.prelude:
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self.emitter.emit(Byte(byte))
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def write_postlude(self):
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pass
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class RawOutputter(Outputter):
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start_addr = 0x0000
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prelude = []
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class PrgOutputter(Outputter):
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start_addr = 0xc000
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prelude = []
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def write_header(self):
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# If we are outputting a .PRG, we output the load address first.
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# We don't use the Emitter for this b/c not part of addr space.
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self.fh.write(bytearray(Word(self.start_addr).serialize(0)))
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class C64BasicPrgOutputter(PrgOutputter):
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start_addr = 0x0801
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prelude = [0x10, 0x08, 0xc9, 0x07, 0x9e, 0x32,
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0x30, 0x36, 0x31, 0x00, 0x00, 0x00]
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class Vic20BasicPrgOutputter(PrgOutputter):
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start_addr = 0x1001
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prelude = [0x0b, 0x10, 0xc9, 0x07, 0x9e, 0x34,
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0x31, 0x30, 0x39, 0x00, 0x00, 0x00]
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class Atari2600CartOutputter(Outputter):
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start_addr = 0xf000
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prelude = [0x78, 0xd8, 0xa2, 0xff, 0x9a, 0xa9,
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0x00, 0x95, 0x00, 0xca, 0xd0, 0xfb]
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def write_postlude(self):
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# If we are outputting a cartridge with boot and BRK address
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# at the end, pad to ROM size minus 4 bytes, and emit addresses.
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self.emitter.pad_to_size(4096 - 4)
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self.emitter.emit(Word(self.start_addr))
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self.emitter.emit(Word(self.start_addr))
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def outputter_class_for(output_format):
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return {
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'raw': RawOutputter,
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'prg': PrgOutputter,
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'c64-basic-prg': C64BasicPrgOutputter,
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'vic20-basic-prg': Vic20BasicPrgOutputter,
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'atari2600-cart': Atari2600CartOutputter,
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}[output_format]
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