blob: 9a2150b964ba17d64496a0e156598e92241e73fa (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
|
#!/usr/bin/env python3
# Copyright (C) 2024 The Qt Company Ltd.
# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
import sys
import struct
class WasmBinary:
"""For reference of binary format see Emscripten source code, especially library_dylink.js."""
def __init__(self, filepath):
self._offset = 0
self._end = 0
self._dependencies = []
with open(filepath, 'rb') as file:
self._binary = file.read()
self._check_preamble()
self._parse_subsections()
def get_dependencies(self):
return self._dependencies
def _get_leb(self):
ret = 0
mul = 1
while True:
byte = self._binary[self._offset]
self._offset += 1
ret += (byte & 0x7f) * mul
mul *= 0x80
if not (byte & 0x80):
break
return ret
def _get_string(self):
length = self._get_leb()
self._offset += length
return self._binary[self._offset - length:self._offset].decode('utf-8')
def _check_preamble(self):
preamble = memoryview(self._binary)[:24]
int32View = struct.unpack('<6I', preamble)
assert int32View[0] == 0x6d736100, "magic number not found"
assert self._binary[8] == 0, "dynlink section needs to be first"
self._offset = 9
section_size = self._get_leb()
self._end = self._offset + section_size
name = self._get_string()
assert name == "dylink.0", "section dylink.0 not found"
def _parse_subsections(self):
WASM_DYLINK_NEEDED = 0x2
while self._offset < self._end:
subsection_type = self._binary[self._offset]
self._offset += 1
subsection_size = self._get_leb()
if subsection_type == WASM_DYLINK_NEEDED:
needed_dynlibs_count = self._get_leb()
for _ in range(needed_dynlibs_count):
self._dependencies.append(self._get_string())
else:
self._offset += subsection_size # we don't care about other sections for now
if __name__ == "__main__":
if len(sys.argv) != 2:
print("Usage: python wasm_binary_tools.py <shared_object>")
sys.exit(1)
file_path = sys.argv[1]
binary = WasmBinary(file_path)
dependencies = binary.get_dependencies()
for d in dependencies:
print(d)
|
