| 1 | #
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| 2 | # Copyright (c) 2008 Martin Decky
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| 3 | # All rights reserved.
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| 4 | #
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| 5 | # Redistribution and use in source and binary forms, with or without
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| 6 | # modification, are permitted provided that the following conditions
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| 7 | # are met:
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| 8 | #
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| 9 | # - Redistributions of source code must retain the above copyright
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| 10 | # notice, this list of conditions and the following disclaimer.
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| 11 | # - Redistributions in binary form must reproduce the above copyright
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| 12 | # notice, this list of conditions and the following disclaimer in the
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| 13 | # documentation and/or other materials provided with the distribution.
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| 14 | # - The name of the author may not be used to endorse or promote products
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| 15 | # derived from this software without specific prior written permission.
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| 16 | #
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| 17 | # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | #
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| 28 | """
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| 29 | Convert descriptive structure definitions to struct formats
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| 30 | """
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| 31 |
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| 32 | import struct
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| 33 |
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| 34 | def convert(definition):
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| 35 | "Convert structure defition to struct format"
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| 36 |
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| 37 | tokens = definition.split(None)
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| 38 |
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| 39 | # Initial byte order tag
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| 40 | struct = {
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| 41 | "little:": lambda: "<",
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| 42 | "big:": lambda: ">",
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| 43 | "network:": lambda: "!"
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| 44 | }[tokens[0]]()
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| 45 |
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| 46 | # Member tags
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| 47 |
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| 48 | for token in tokens[1:]:
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| 49 | if (token[0:5] == "char["):
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| 50 | size = token[5:].split("]")[0]
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| 51 | struct += ("%d" % int(size)) + "s"
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| 52 | else:
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| 53 | struct += {
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| 54 | "uint8_t": lambda: "B",
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| 55 | "uint16_t": lambda: "H",
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| 56 | "uint32_t": lambda: "L",
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| 57 | "uint64_t": lambda: "Q",
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| 58 |
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| 59 | "int8_t": lambda: "b",
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| 60 | "int16_t": lambda: "h",
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| 61 | "int32_t": lambda: "l",
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| 62 | "int64_t": lambda: "q"
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| 63 | }[token]()
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| 64 |
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| 65 | return struct
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| 66 |
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| 67 | def little_string(string):
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| 68 | return struct.pack("<" + ("%d" % len(string)) + "s", string)
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