mirror of
https://github.com/eledio-devices/thirdparty-littlefs.git
synced 2025-10-31 00:32:38 +01:00
45 lines
1.1 KiB
Python
Executable File
45 lines
1.1 KiB
Python
Executable File
#!/usr/bin/env python2
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import struct
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import sys
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import os
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import argparse
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def corrupt(block):
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with open(block, 'r+b') as file:
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# skip rev
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file.read(4)
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# go to last commit
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tag = 0xffffffff
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while True:
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try:
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ntag, = struct.unpack('>I', file.read(4))
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except struct.error:
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break
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tag ^= ntag
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size = (tag & 0x3ff) if (tag & 0x3ff) != 0x3ff else 0
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file.seek(size, os.SEEK_CUR)
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# lob off last 3 bytes
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file.seek(-(size + 3), os.SEEK_CUR)
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file.truncate()
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def main(args):
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if args.n or not args.blocks:
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with open('blocks/.history', 'rb') as file:
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for i in range(int(args.n or 1)):
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last, = struct.unpack('<I', file.read(4))
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args.blocks.append('blocks/%x' % last)
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for block in args.blocks:
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print 'corrupting %s' % block
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corrupt(block)
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if __name__ == "__main__":
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parser = argparse.ArgumentParser()
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parser.add_argument('-n')
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parser.add_argument('blocks', nargs='*')
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main(parser.parse_args())
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