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leommxj/dbr.py

Created February 7, 2021 06:08
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dbr.py
bt16 = [0xeb, 0x3c, 0x90, 0x43, 0x6f, 0x6e, 0x73, 0x79, 0x73, 0x56, 0x58, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x0e, 0x1f,
0x88, 0x16, 0x24, 0x7c, 0xbe, 0x7b, 0x7d, 0xe8, 0x22, 0x01, 0xb8, 0x00, 0x08, 0xa3, 0x14, 0x7c,
0xb8, 0xbe, 0x7c, 0xa3, 0x20, 0x7c, 0xb8, 0x05, 0x7d, 0xa3, 0x22, 0x7c, 0x66, 0x0f, 0xb7, 0x06,
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0x00, 0x00, 0x00, 0x42, 0x4f, 0x4f, 0x54, 0x52, 0x4f, 0x4d, 0x20, 0x53, 0x59, 0x53, 0x55, 0xaa,]
bt32 = [0xeb, 0x58, 0x90, 0x43, 0x6f, 0x6e, 0x73, 0x79, 0x73, 0x56, 0x58, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x90, 0x0e, 0x1f, 0x88, 0x16, 0x40, 0x7c,
0xbe, 0x9c, 0x7d, 0xe8, 0x27, 0x01, 0xb8, 0x00, 0x08, 0xa3, 0x14, 0x7c, 0xb8, 0xc5, 0x7c, 0xa3,
0x20, 0x7c, 0xb8, 0x1b, 0x7d, 0xa3, 0x22, 0x7c, 0x66, 0x0f, 0xb7, 0x06, 0x0e, 0x7c, 0x66, 0x03,
0x06, 0x1c, 0x7c, 0x66, 0xa3, 0x1c, 0x7c, 0x66, 0x0f, 0xb6, 0x06, 0x10, 0x7c, 0x66, 0xf7, 0x26,
0x24, 0x7c, 0x66, 0x03, 0x06, 0x1c, 0x7c, 0x66, 0xa3, 0x18, 0x7c, 0xe8, 0x27, 0x00, 0xff, 0x36,
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0x46, 0xfe, 0x66, 0x0f, 0xb6, 0x0e, 0x0d, 0x7c, 0x66, 0xf7, 0xe1, 0x66, 0x03, 0x06, 0x18, 0x7c,
0x66, 0x83, 0xe6, 0x7f, 0x26, 0x66, 0x67, 0x8b, 0x34, 0xb5, 0x00, 0x00, 0x00, 0x00, 0xe8, 0x11,
0x00, 0xc1, 0xe1, 0x05, 0x8c, 0xc0, 0x01, 0xc8, 0x8e, 0xc0, 0x66, 0x81, 0xfe, 0xf8, 0xff, 0xff,
0x0f, 0xc3, 0x66, 0x60, 0x6a, 0x00, 0x6a, 0x00, 0x66, 0x50, 0x06, 0x53, 0x51, 0x6a, 0x10, 0xb4,
0x42, 0x8a, 0x16, 0x40, 0x7c, 0x89, 0xe6, 0x16, 0x1f, 0xcd, 0x13, 0x0e, 0x1f, 0x72, 0x06, 0x83,
0xc4, 0x10, 0x66, 0x61, 0xc3, 0xbe, 0xce, 0x7d, 0xe8, 0x02, 0x00, 0xeb, 0xfe, 0xac, 0x08, 0xc0,
0x74, 0x09, 0xb4, 0x0e, 0xbb, 0x07, 0x00, 0xcd, 0x10, 0xeb, 0xf2, 0xc3, 0x43, 0x6f, 0x6e, 0x73,
0x79, 0x73, 0x20, 0x56, 0x58, 0x4c, 0x44, 0x20, 0x32, 0x2e, 0x30, 0x0d, 0x0a, 0x00, 0x46, 0x69,
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0x00, 0x00, 0x00, 0x42, 0x4f, 0x4f, 0x54, 0x52, 0x4f, 0x4d, 0x20, 0x53, 0x59, 0x53, 0x55, 0xaa, ]
Raw
vxsys.py
from dbr import bt16, bt32
import sys
import struct
from hexdump import hexdump
def find_drive(mbr):
part_entrys = mbr[512-2-16*4:]
hexdump(part_entrys)
for i in range(4):
ptype = part_entrys[16*i+4]
if ptype in (0x04, 0x06, 0x0b, 0x0c, 0x0e):
return (ptype, struct.unpack("<I", part_entrys[16*i+8:16*i+12])[0], struct.unpack(">I", part_entrys[16*i+12:16*i+16])[0])
MAGIC_SECTOR_SIZE = 512
if __name__ == '__main__':
filename = sys.argv[1]
with open(filename, 'rb+') as f:
ori = f.read(512)
(ptype, lba, size) = find_drive(ori)
print(ptype, lba, size)
f.seek(MAGIC_SECTOR_SIZE * lba, 0)
ori_part = f.read(512)
if ptype in (0xb, 0xc):
btbuf = bt32[:]
btbuf[0xb:0xb+0x4f] = ori_part[0xb:0xb+0x4f]
else:
btbuf = bt16[:]
btbuf[0xb:0xb+0x33] = ori_part[0xb:0xb+0x33]
btbuf[3:3+8] = ori_part[3:3+8]
f.seek(MAGIC_SECTOR_SIZE * lba, 0)
f.write(bytes(btbuf))
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