76 lines
2.2 KiB
Python
76 lines
2.2 KiB
Python
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from pathlib import Path
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def u16(data, off):
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return data[off] | (data[off + 1] << 8)
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def u32(data, off):
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return u16(data, off) | (u16(data, off + 2) << 16)
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def main():
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path = Path(r"k:\ghidra\Crusader_Decomp\REGRET.EXE")
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data = path.read_bytes()
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ne_off = u32(data, 0x3C)
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seg_table_off = ne_off + u16(data, ne_off + 0x22)
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align_shift = u16(data, ne_off + 0x32)
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seg_count = u16(data, ne_off + 0x1C)
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print(f"NE header: 0x{ne_off:X}")
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print(f"Segment table: 0x{seg_table_off:X}")
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print(f"Align shift: {align_shift}")
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print(f"Segment count: {seg_count}")
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selector = 0x1148
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seg_index = ((selector - 0x1000) // 8) + 1
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seg_entry_off = seg_table_off + (seg_index - 1) * 8
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sector = u16(data, seg_entry_off)
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seg_len = u16(data, seg_entry_off + 2)
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flags = u16(data, seg_entry_off + 4)
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min_alloc = u16(data, seg_entry_off + 6)
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seg_file_off = sector << align_shift
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print(f"Selector 0x{selector:X} -> segment index {seg_index}")
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print(
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f"Segment entry @ 0x{seg_entry_off:X}: sector=0x{sector:X} len=0x{seg_len:X} flags=0x{flags:X} min=0x{min_alloc:X} file=0x{seg_file_off:X}"
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)
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for site in (0x3678, 0x36C0, 0x3702):
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raw = seg_file_off + site
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print(f"Site 0x{site:04X} -> file 0x{raw:X}: {data[raw:raw+8].hex(' ')}")
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reloc_off = seg_file_off + seg_len
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count = u16(data, reloc_off)
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print(f"Reloc table @ 0x{reloc_off:X}, count={count}")
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wanted = {
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0x3678,
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0x3679,
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0x367A,
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0x36C0,
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0x36C1,
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0x36C2,
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0x3702,
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0x3703,
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0x3704,
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}
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hits = []
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pos = reloc_off + 2
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for i in range(count):
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src_type = data[pos]
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flags = data[pos + 1]
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src_off = u16(data, pos + 2)
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payload = data[pos + 4 : pos + 8]
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if src_off in wanted:
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hits.append((i, pos, src_type, flags, src_off, payload))
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pos += 8
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for i, pos, src_type, flags, src_off, payload in hits:
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print(
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f"Hit #{i} rec@0x{pos:X}: src_type=0x{src_type:02X} flags=0x{flags:02X} src=0x{src_off:04X} payload={payload.hex(' ')}"
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)
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if __name__ == "__main__":
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main()
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