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#!/usr/bin/env python3
#
# Copyright (C) 2020-2023 by Juan J. Martinez <jjm@usebox.net>
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#
__version__ = "1.1"
import os
from argparse import ArgumentParser
DEF_ADDR = 0x4000
TYPES = ("binary", "basic", "ascii", "custom-header", "custom")
TYPE_BLOCK = {
"binary": bytes((0xD0 for _ in range(10))),
"basic": bytes((0xD3 for _ in range(10))),
"ascii": bytes((0xEA for _ in range(10))),
}
BLOCK_ID = bytes((0x1F, 0xA6, 0xDE, 0xBA, 0xCC, 0x13, 0x7D, 0x74))
def write_word(fd, word):
fd.write(bytes((word & 0xFF, word >> 8)))
def auto_int(value):
return int(value, 0)
def main():
parser = ArgumentParser(
description="Make a CAS file for the MSX",
epilog="Copyright (C) 2020-2023 Juan J Martinez <jjm@usebox.net>",
)
parser.add_argument(
"--version", action="version", version="%(prog)s " + __version__
)
parser.add_argument(
"-a",
"--add",
dest="add",
action="store_true",
help="append to the existing CAS file instead of creating a new one",
)
parser.add_argument(
"--name",
dest="name",
default=None,
type=str,
help="name to use for the file (limit 6 chars, defaults to the file name)",
)
parser.add_argument(
"--addr",
dest="addr",
default=DEF_ADDR,
type=auto_int,
help="address to load if binary file (default: 0x%04x)" % DEF_ADDR,
)
parser.add_argument(
"--exec",
dest="exec",
default=DEF_ADDR,
type=auto_int,
help="address to exec if binary file (default: 0x%04x)" % DEF_ADDR,
)
parser.add_argument("output", help="target .CAS file")
parser.add_argument("type", help="file type", choices=TYPES)
parser.add_argument("file", help="input file")
args = parser.parse_args()
if args.add:
flags = "ab"
else:
flags = "wb"
with open(args.output, flags) as out:
if args.name:
name = args.name
else:
name = os.path.basename(args.file)
with open(args.file, "rb") as inf:
data = inf.read()
out.write(BLOCK_ID)
if args.type == "ascii":
out.write(TYPE_BLOCK[args.type])
out.write(name[:6].ljust(6).encode("ascii"))
for b in range(0, len(data), 256):
out.write(BLOCK_ID)
out.write(data[b : b + 256])
padding = 256 - (len(data) % 256)
if padding == 256:
out.write(BLOCK_ID)
out.write(bytes((0x1A for _ in range(padding))))
elif args.type == "basic":
out.write(TYPE_BLOCK[args.type])
out.write(name[:6].ljust(6).encode("ascii"))
out.write(BLOCK_ID)
out.write(data)
elif args.type == "binary":
addr = args.addr
exec_addr = args.exec
end_addr = addr + len(data) - 1
if end_addr > 0xFFFF:
parser.error("Binary doesn't fit in memory")
out.write(TYPE_BLOCK[args.type])
out.write(name[:6].ljust(6).encode("ascii"))
out.write(BLOCK_ID)
write_word(out, addr)
write_word(out, end_addr)
write_word(out, exec_addr)
out.write(data)
elif args.type == "custom-header":
addr = args.addr
length = len(data)
write_word(out, addr)
write_word(out, length)
out.write(data)
else:
# custom
out.write(data)
if __name__ == "__main__":
main()
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