68 lines
2.0 KiB
Python
68 lines
2.0 KiB
Python
import bsdiff4
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import yaml
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from typing import Optional
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import Utils
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from Patch import APDeltaPatch
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import os
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USHASH = '6e9c94511d04fac6e0a1e582c170be3a'
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class SoEDeltaPatch(APDeltaPatch):
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hash = USHASH
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game = "Secret of Evermore"
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patch_file_ending = ".apsoe"
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@classmethod
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def get_source_data(cls) -> bytes:
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with open(get_base_rom_path(), "rb") as stream:
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return read_rom(stream)
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def get_base_rom_path(file_name: Optional[str] = None) -> str:
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options = Utils.get_options()
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if not file_name:
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file_name = options["soe_options"]["rom_file"]
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if not os.path.exists(file_name):
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file_name = Utils.user_path(file_name)
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return file_name
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def read_rom(stream, strip_header=True) -> bytes:
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"""Reads rom into bytearray and optionally strips off any smc header"""
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data = stream.read()
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if strip_header and len(data) % 0x400 == 0x200:
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return data[0x200:]
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return data
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def generate_yaml(patch: bytes, metadata: Optional[dict] = None) -> bytes:
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"""Generate old (<4) apbp format yaml"""
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patch = yaml.dump({"meta": metadata,
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"patch": patch,
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"game": "Secret of Evermore",
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# minimum version of patch system expected for patching to be successful
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"compatible_version": 1,
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"version": 2,
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"base_checksum": USHASH})
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return patch.encode(encoding="utf-8-sig")
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def generate_patch(vanilla_file, randomized_file, metadata: Optional[dict] = None) -> bytes:
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"""Generate old (<4) apbp format patch data. Run through lzma to get a complete apbp file."""
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with open(vanilla_file, "rb") as f:
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vanilla = read_rom(f)
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with open(randomized_file, "rb") as f:
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randomized = read_rom(f)
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if metadata is None:
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metadata = {}
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patch = bsdiff4.diff(vanilla, randomized)
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return generate_yaml(patch, metadata)
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if __name__ == '__main__':
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import sys
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print('Please use ../../Patch.py', file=sys.stderr)
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sys.exit(1)
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