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#!/usr/bin/env python3
# Copyright (c) 2022, Vi Grey
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
import sys
import os
def print_help():
print("Usage: python3 tasd2r08 <input file path> <output file path>\r\n" +
"Example: python3 tasd2r08 ~/TAS/smb.tasd /tmp/smb.r08")
def handle_packet(offset):
init_offset = offset
global infile_data
global infile_len
global tasd_g_len
packet_type = int.from_bytes(infile_data[offset: offset + tasd_g_len],
byteorder="big", signed=False)
offset += tasd_g_len
if offset >= infile_len:
return (1, b"", offset)
packet_exp = infile_data[offset]
offset += 1
if offset + packet_exp >= infile_len:
return (1, b"", offset)
packet_len = int.from_bytes(infile_data[offset: offset + packet_exp],
byteorder="big", signed=False)
offset += packet_exp
if offset + packet_len > infile_len:
return (1, b"", offset)
if packet_type != 0xfe01:
offset += packet_len
return (1, b"", offset)
return (infile_data[offset],
infile_data[offset + 1: offset + packet_len],
offset + packet_len)
def main():
global infile_data
global infile_len
global tasd_g_len
if len(sys.argv) != 3:
print_help()
sys.exit(0)
infile_name = sys.argv[1]
outfile_name = sys.argv[2]
outfile_data = b""
try:
infile = open(infile_name, "rb")
infile_data = infile.read()
infile.close()
except:
print("Unable to read input file " + infile_name)
print("Exiting")
sys.exit(1)
if os.path.exists(outfile_name):
print("File " + outfile_name + " already exists")
reply = input("Overwrite file? [yes/No] ").lower()
if reply != "yes" and reply != "y":
print("Canceling conversion. No files were written to.")
print("Exiting")
sys.exit(1)
infile_len = len(infile_data)
if infile_len < 7:
print("Input file is not a TASD file (File not long enough to be a" +
"TASD file)")
print("Exiting")
sys.exit(1)
if infile_data[0:4] != b"TASD":
print("Input file is not a TASD file (Invalid file header)")
print("Exiting")
sys.exit(1)
tasd_version = int.from_bytes(infile_data[4:6], byteorder="big",
signed=False)
tasd_g_len = infile_data[6]
if tasd_version != 1:
print("Input file is not using a valid TASD file version")
print("Exiting")
sys.exit(1)
# set infile_offset to after TASD file header, which is 7 bytes long
infile_offset = 7
while infile_offset + tasd_g_len < infile_len:
(port, data, infile_offset) = handle_packet(infile_offset)
if len(data) > 0:
r08Data[port] += data
r08MaxLen = 0
for port in r08Data:
dataLen = len(r08Data[port])
if dataLen > r08MaxLen:
r08MaxLen = dataLen
for port in r08Data:
dataLen = len(r08Data[port])
if dataLen < r08MaxLen:
r08Data[port] += b"\xff" * (r08MaxLen - dataLen)
for offset in range(r08MaxLen):
for port in sorted(r08Data):
outfile_data += (r08Data[port][offset]^0xFF).to_bytes(1, "big")
try:
outfile = open(outfile_name, "wb")
outfile.write(outfile_data)
outfile.close()
except:
print("Unable to write output file " + infile_name)
print("Exiting")
sys.exit(1)
print("Finished writing " + outfile_name)
infile_data = b""
infile_len = 0
tasd_g_len = 1
r08Data = {1: b"", 2: b""}
if __name__ == "__main__":
main()
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