mirror of
https://github.com/dobin/SuperMega
synced 2026-06-03 01:27:11 +00:00
Dobin
104 lines
3.6 KiB
Python
104 lines
3.6 KiB
Python
import sys
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import pefile
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from intervaltree import Interval, IntervalTree
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from typing import List, Dict
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import os
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from model.carrier import DataReuseEntry
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def bytes_to_asm_db(byte_data: bytes) -> bytes:
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# Convert each byte to a string in hexadecimal format
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# prefixed with '0' and suffixed with 'h'
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hex_values = [f"0{byte:02x}H" for byte in byte_data]
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formatted_string = ', '.join(hex_values)
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return "\tDB " + formatted_string
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class ReusedataAsmFileParser():
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def __init__(self, filepath):
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self.filepath = filepath
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self.lines = []
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self.fixups: Dict[str, DataReuseEntry] = {}
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def get_reusedata_fixups(self) -> List[DataReuseEntry]:
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return list(self.fixups.values())
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def init(self):
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with open(self.filepath, "r") as f:
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self.lines = f.readlines()
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self.lines = [line.rstrip() for line in self.lines]
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def process(self):
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self.fixup_data_reuse_code()
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self.fixup_data_reuse_data()
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def fixup_data_reuse_code(self):
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fixups = []
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# lea rcx, OFFSET FLAT:$SG72513
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for idx, line in enumerate(self.lines):
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if "OFFSET FLAT:$SG" in line:
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string_ref = line.split("OFFSET FLAT:")[1]
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register = line.split("lea\t")[1].split(",")[0]
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randbytes: bytes = os.urandom(7) # lea is 7 bytes
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self.fixups[string_ref] = DataReuseEntry(string_ref, register, randbytes)
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self.lines[idx] = bytes_to_asm_db(randbytes) + " ; .rdata Reuse for {} ({})".format(
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string_ref, register)
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return fixups
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def fixup_data_reuse_data(self) -> List[str]:
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current_entry_name = ""
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for line in self.lines:
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# $SG72513 DB 'U', 00H, 'S', 00H, 'E', 00H, 'R', 00H, 'P', 00H, 'R', 00H
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# DB 'O', 00H, 'F', 00H, 'I', 00H, 'L', 00H, 'E', 00H, 00H, 00H
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if line.startswith("$SG"):
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parts = line.split()
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name = parts[0]
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current_entry_name = name
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value = b''
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for part in parts:
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if part.startswith('\''):
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value += str.encode(part.split('\'')[1])
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elif part.endswith('H') or part.endswith('H,'):
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hex = part.split('H')[0]
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value += bytes.fromhex(hex)
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if not name in self.fixups:
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raise Exception("DataReuse: Entry {} not found in fixups".format(name))
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self.fixups[name].data = value
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elif line.startswith("\tDB"):
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if current_entry_name == "":
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continue
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value = b''
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parts = line.split()
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for part in parts:
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if part.startswith('\''):
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value += str.encode(part.split('\'')[1])
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elif part.endswith('H') or part.endswith('H,'):
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hex = part.split('H')[0]
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if len(hex) == 3:
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hex = hex.lstrip('0')
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value += bytes.fromhex(hex)
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if not name in self.fixups:
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raise Exception("DataReuse: Entry {} not found in fixups".format(name))
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self.fixups[name].data += value
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else:
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current_entry_name = ""
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def write_lines_to(self, filename):
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with open(filename, 'w',) as asmfile:
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for line in self.lines:
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asmfile.write(line + "\n")
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