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#!/usr/bin/python
"""
Write an overlapping partition to a msdos disk
Call with disk image/device to mangle
"""
import sys
BAD_ENTRY = (0x72, 0xf5, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x01, 0x10, 0x83, 0x03, 0x20, 0x4f, 0x00, 0x08,
0x00, 0x00, 0x00, 0x20, 0x00, 0x00, 0x00, 0x00,
0x00, 0x50, 0x83, 0x00, 0x0a, 0x7a, 0xff, 0x27,
0x00, 0x00, 0x0a, 0x15, 0x00, 0x00, 0x00, 0x00 )
OFFSET = 0x1b8
if len(sys.argv) < 2:
print "%s: <image or device>"
sys.exit(1)
data = "".join(chr(c) for c in BAD_ENTRY)
with open(sys.argv[1], "rb+") as f:
f.seek(OFFSET, 0)
f.write(data)
sys.exit(0)
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