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22 lines
1.0 KiB
Python
22 lines
1.0 KiB
Python
import struct, sys, hashlib
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d = open(sys.argv[1], 'rb').read()
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assert d[:4] == b'\x4f\x15\x3d\x1d'
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hdr_size, meta_size, file_size, n_entries = struct.unpack_from('<HHQH', d, 0x0C)
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entries = [struct.unpack_from('<QQQQ', d, 0x20 + i*0x20) for i in range(n_entries)]
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eo = 0x20 + n_entries*0x20
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assert d[eo:eo+4] == b'\x7fELF', hex(eo)
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e_phoff, = struct.unpack_from('<Q', d, eo+0x20)
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e_phentsize, e_phnum = struct.unpack_from('<HH', d, eo+0x36)
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phdrs = [struct.unpack_from('<IIQQQQQQ', d, eo+e_phoff+i*e_phentsize) for i in range(e_phnum)]
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out_size = max(p[2]+p[5] for p in phdrs if p[5])
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out = bytearray(max(out_size, e_phoff+e_phnum*e_phentsize))
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out[:e_phoff+e_phnum*e_phentsize] = d[eo:eo+e_phoff+e_phnum*e_phentsize]
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for props, off, fsz, msz in entries:
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if not (props & 0x800): continue # has segment index
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seg = (props >> 20) & 0xFFF
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if props & 0x8: print('compressed segment', seg); continue
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p = phdrs[seg]
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out[p[2]:p[2]+p[5]] = d[off:off+p[5]]
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open(sys.argv[2], 'wb').write(out)
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print(len(out), hashlib.sha256(out).hexdigest())
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