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10390f6514
Differential Revision: https://phabricator.services.mozilla.com/D37545 --HG-- extra : moz-landing-system : lando
95 lines
2.5 KiB
Python
Executable File
95 lines
2.5 KiB
Python
Executable File
#!/usr/bin/env python
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from __future__ import absolute_import, print_function
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# This Source Code Form is subject to the terms of the Mozilla Public
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# License, v. 2.0. If a copy of the MPL was not distributed with this file,
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# You can obtain one at http://mozilla.org/MPL/2.0/.
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import io
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import os
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import struct
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import sys
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MAGIC = b'mozXDRcachev002\0'
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def usage():
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print("""Usage: script_cache.py <file.bin> ...
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Decodes and prints out the contents of a startup script cache file
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(e.g., startupCache/scriptCache.bin) in human-readable form.""")
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sys.exit(1)
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class ProcessTypes:
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Uninitialized = 0
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Parent = 1
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Web = 2
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Extension = 3
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Privileged = 4
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def __init__(self, val):
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self.val = val
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def __str__(self):
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res = []
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if self.val & (1 << self.Uninitialized):
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raise Exception('Uninitialized process type')
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if self.val & (1 << self.Parent):
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res.append('Parent')
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if self.val & (1 << self.Web):
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res.append('Web')
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if self.val & (1 << self.Extension):
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res.append('Extension')
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if self.val & (1 << self.Privileged):
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res.append('Privileged')
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return '|'.join(res)
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class InputBuffer(object):
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def __init__(self, data):
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self.data = data
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self.offset = 0
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@property
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def remaining(self):
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return len(self.data) - self.offset
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def unpack(self, fmt):
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res = struct.unpack_from(fmt, self.data, self.offset)
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self.offset += struct.calcsize(fmt)
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return res
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def unpack_str(self):
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size, = self.unpack('<H')
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res = self.data[self.offset:self.offset + size].decode('utf-8')
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self.offset += size
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return res
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if len(sys.argv) < 2 or not os.path.exists(sys.argv[1]):
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usage()
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for filename in sys.argv[1:]:
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with io.open(filename, 'rb') as f:
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magic = f.read(len(MAGIC))
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if magic != MAGIC:
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raise Exception('Bad magic number')
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hdrSize, = struct.unpack('<I', f.read(4))
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hdr = InputBuffer(f.read(hdrSize))
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i = 0
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while hdr.remaining:
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i += 1
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print('{}: {}'.format(i, hdr.unpack_str()))
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print(' Key: {}'.format(hdr.unpack_str()))
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print(' Offset: {:>9,}'.format(*hdr.unpack('<I')))
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print(' Size: {:>9,}'.format(*hdr.unpack('<I')))
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print(' Processes: {}'.format(ProcessTypes(*hdr.unpack('B'))))
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print('')
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