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from __future__ import annotations
import io
from typing import Any
import numpy as np
import numpy.typing as npt
from ._parser import AltRepConstructorMap, Parser
class ParserXDR(Parser):
"""Parser for data in XDR format."""
def __init__(
self,
data: memoryview,
*,
expand_altrep: bool,
altrep_constructor_dict: AltRepConstructorMap,
) -> None:
super().__init__(
expand_altrep=expand_altrep,
altrep_constructor_dict=altrep_constructor_dict,
)
self.file = io.BytesIO(data)
def _parse_array_values(
self,
dtype: npt.DTypeLike,
length: int,
) -> npt.NDArray[Any]:
dtype = np.dtype(dtype)
buffer = self.file.read(length * dtype.itemsize)
# Read in big-endian order and convert to native byte order
return np.frombuffer(
buffer,
dtype=dtype.newbyteorder(">"),
).astype(dtype, copy=False)
def parse_string(self, length: int) -> bytes:
return self.file.read(length)
def check_complete(self) -> None:
assert self.file.read(1) == b""
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