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1 | # |
1 | # |
2 | # Copyright (c) 2008 Martin Decky |
2 | # Copyright (c) 2008 Martin Decky |
3 | # All rights reserved. |
3 | # All rights reserved. |
4 | # |
4 | # |
5 | # Redistribution and use in source and binary forms, with or without |
5 | # Redistribution and use in source and binary forms, with or without |
6 | # modification, are permitted provided that the following conditions |
6 | # modification, are permitted provided that the following conditions |
7 | # are met: |
7 | # are met: |
8 | # |
8 | # |
9 | # - Redistributions of source code must retain the above copyright |
9 | # - Redistributions of source code must retain the above copyright |
10 | # notice, this list of conditions and the following disclaimer. |
10 | # notice, this list of conditions and the following disclaimer. |
11 | # - Redistributions in binary form must reproduce the above copyright |
11 | # - Redistributions in binary form must reproduce the above copyright |
12 | # notice, this list of conditions and the following disclaimer in the |
12 | # notice, this list of conditions and the following disclaimer in the |
13 | # documentation and/or other materials provided with the distribution. |
13 | # documentation and/or other materials provided with the distribution. |
14 | # - The name of the author may not be used to endorse or promote products |
14 | # - The name of the author may not be used to endorse or promote products |
15 | # derived from this software without specific prior written permission. |
15 | # derived from this software without specific prior written permission. |
16 | # |
16 | # |
17 | # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
17 | # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
18 | # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
18 | # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
19 | # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
20 | # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
21 | # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
22 | # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
23 | # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
23 | # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 | # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
24 | # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
25 | # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
25 | # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
26 | # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
26 | # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | # |
27 | # |
28 | """ |
28 | """ |
29 | Convert descriptive structure definitions to struct formats |
29 | Convert descriptive structure definitions to structure object |
30 | """ |
30 | """ |
31 | 31 | ||
32 | import struct |
32 | import struct |
33 | 33 | ||
- | 34 | class Struct: |
|
- | 35 | def size(self): |
|
- | 36 | return struct.calcsize(self._format_) |
|
- | 37 | ||
- | 38 | def pack(self): |
|
- | 39 | list = [] |
|
- | 40 | for variable in self._list_: |
|
- | 41 | list.append(self.__dict__[variable]) |
|
- | 42 | ||
- | 43 | return struct.pack(self._format_, *list) |
|
- | 44 | ||
34 | def convert(definition): |
45 | def create(definition): |
35 | "Convert structure defition to struct format" |
46 | "Create structure object" |
36 | 47 | ||
37 | tokens = definition.split(None) |
48 | tokens = definition.split(None) |
38 | 49 | ||
39 | # Initial byte order tag |
50 | # Initial byte order tag |
40 | struct = { |
51 | format = { |
41 | "little:": lambda: "<", |
52 | "little:": lambda: "<", |
42 | "big:": lambda: ">", |
53 | "big:": lambda: ">", |
43 | "network:": lambda: "!" |
54 | "network:": lambda: "!" |
44 | }[tokens[0]]() |
55 | }[tokens[0]]() |
- | 56 | inst = Struct() |
|
- | 57 | list = [] |
|
45 | 58 | ||
46 | # Member tags |
59 | # Member tags |
47 | - | ||
48 | comment = False |
60 | comment = False |
- | 61 | variable = False |
|
49 | for token in tokens[1:]: |
62 | for token in tokens[1:]: |
50 | if (comment): |
63 | if (comment): |
51 | if (token == "*/"): |
64 | if (token == "*/"): |
52 | comment = False |
65 | comment = False |
53 | continue |
66 | continue |
54 | 67 | ||
- | 68 | if (variable): |
|
- | 69 | inst.__dict__[token] = None |
|
- | 70 | list.append(token) |
|
- | 71 | variable = False |
|
- | 72 | continue |
|
- | 73 | ||
55 | if (token == "/*"): |
74 | if (token == "/*"): |
56 | comment = True |
75 | comment = True |
- | 76 | elif (token[0:8] == "padding["): |
|
- | 77 | size = token[8:].split("]")[0] |
|
- | 78 | format += "%dx" % int(size) |
|
57 | elif (token[0:5] == "char["): |
79 | elif (token[0:5] == "char["): |
58 | size = token[5:].split("]")[0] |
80 | size = token[5:].split("]")[0] |
59 | struct += ("%d" % int(size)) + "s" |
81 | format += "%ds" % int(size) |
- | 82 | variable = True |
|
60 | else: |
83 | else: |
61 | struct += { |
84 | format += { |
62 | "uint8_t": lambda: "B", |
85 | "uint8_t": lambda: "B", |
63 | "uint16_t": lambda: "H", |
86 | "uint16_t": lambda: "H", |
64 | "uint32_t": lambda: "L", |
87 | "uint32_t": lambda: "L", |
65 | "uint64_t": lambda: "Q", |
88 | "uint64_t": lambda: "Q", |
66 | 89 | ||
67 | "int8_t": lambda: "b", |
90 | "int8_t": lambda: "b", |
68 | "int16_t": lambda: "h", |
91 | "int16_t": lambda: "h", |
69 | "int32_t": lambda: "l", |
92 | "int32_t": lambda: "l", |
70 | "int64_t": lambda: "q" |
93 | "int64_t": lambda: "q" |
71 | }[token]() |
94 | }[token]() |
- | 95 | variable = True |
|
72 | 96 | ||
73 | return struct |
- | |
74 | - | ||
75 | def little_string(string): |
97 | inst.__dict__['_format_'] = format |
76 | return struct.pack("<" + ("%d" % len(string)) + "s", string) |
98 | inst.__dict__['_list_'] = list |
77 | - | ||
78 | def little_padding(length): |
99 | return inst |
79 | return struct.pack("<" + ("%d" % length) + "x") |
- | |
80 | 100 |