73 lines
2.0 KiB
Python
73 lines
2.0 KiB
Python
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#!/usr/bin/env python
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#
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# Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
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#
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# This file is part of PortaPack.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2, or (at your option)
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# any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; see the file COPYING. If not, write to
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# the Free Software Foundation, Inc., 51 Franklin Street,
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# Boston, MA 02110-1301, USA.
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#
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import sys
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import struct
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usage_message = """
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PortaPack image chunk writer
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Usage: <command> <input_binary> <four-characer tag> <output_tagged_binary> [<chunk max size>]
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"""
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def read_image(path):
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f = open(path, 'rb')
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data = f.read()
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f.close()
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return data
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def write_image(data, path):
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f = open(path, 'wb')
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f.write(data)
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f.close()
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input_image_max_length = 32768
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if len(sys.argv) in (4, 5):
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input_image = read_image(sys.argv[1])
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tag = tuple(map(ord, sys.argv[2]))
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output_path = sys.argv[3]
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if len(sys.argv) == 5:
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input_image_max_length = int(sys.argv[4])
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elif len(sys.argv) == 2:
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input_image = bytearray()
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tag = (0, 0, 0, 0)
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output_path = sys.argv[1]
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else:
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print(usage_message)
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sys.exit(-1)
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if len(tag) != 4:
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print(usage_message)
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sys.exit(-2)
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if len(input_image) > input_image_max_length:
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raise RuntimeError('image size of %d exceeds device size of %d bytes' % (len(input_image), input_image_max_length))
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if (len(input_image) & 3) != 0:
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raise RuntimeError('image size of %d is not multiple of four' % (len(input_image,)))
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output_image = bytearray()
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output_image += struct.pack('<4BI', tag[0], tag[1], tag[2], tag[3], len(input_image))
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output_image += input_image
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write_image(output_image, output_path)
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