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1073f9d5dd
* mypy: warn_unused_ignores = true (and remove some) * catch up * type checking tweaks * precommit uses mypy --no-warn-unused-ignores * revert a bit * precommit explanatory comment * Update .pre-commit-config.yaml Co-authored-by: dustinface <35775977+xdustinface@users.noreply.github.com> Co-authored-by: dustinface <35775977+xdustinface@users.noreply.github.com>
47 lines
1.4 KiB
Python
47 lines
1.4 KiB
Python
import io
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import struct
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from typing import Any, BinaryIO
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class StructStream(int):
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PACK = ""
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"""
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Create a class that can parse and stream itself based on a struct.pack template string.
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"""
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def __new__(cls: Any, value: int):
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value = int(value)
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try:
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v1 = struct.unpack(cls.PACK, struct.pack(cls.PACK, value))[0]
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if value != v1:
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raise ValueError(f"Value {value} does not fit into {cls.__name__}")
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except Exception:
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bits = struct.calcsize(cls.PACK) * 8
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raise ValueError(
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f"Value {value} of size {value.bit_length()} does not fit into " f"{cls.__name__} of size {bits}"
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)
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return int.__new__(cls, value)
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@classmethod
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def parse(cls: Any, f: BinaryIO) -> Any:
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bytes_to_read = struct.calcsize(cls.PACK)
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read_bytes = f.read(bytes_to_read)
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assert read_bytes is not None and len(read_bytes) == bytes_to_read
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return cls(*struct.unpack(cls.PACK, read_bytes))
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def stream(self, f):
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f.write(struct.pack(self.PACK, self))
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@classmethod
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def from_bytes(cls: Any, blob: bytes) -> Any: # type: ignore
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f = io.BytesIO(blob)
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result = cls.parse(f)
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assert f.read() == b""
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return result
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def __bytes__(self: Any) -> bytes:
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f = io.BytesIO()
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self.stream(f)
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return bytes(f.getvalue())
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