io-scene-oct/binary_reader.py at main · jmancoder/io-scene-oct · GitHub

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from io import BytesIO, StringIO
import struct
from typing import Literal


class BinaryReader(BytesIO):
    def __init__(self, data: bytes, big_endian=False) -> None:
        super().__init__(data)

        self.endian_symbol: Literal["<", ">"]
        self.byte_order: Literal["little", "big"]
        if big_endian:
            self.endian_symbol = ">"
            self.byte_order = "big"
        else:
            self.endian_symbol = "<"
            self.byte_order = "little"

    def read_uint8(self) -> int:
        return int.from_bytes(self.read(1), signed=False, byteorder=self.byte_order)

    def read_int8(self) -> int:
        return int.from_bytes(self.read(1), signed=True, byteorder=self.byte_order)

    def read_uint12(self) -> int:
        return int.from_bytes(self.read(3), signed=False, byteorder=self.byte_order)

    def read_int12(self) -> int:
        return int.from_bytes(self.read(3), signed=True, byteorder=self.byte_order)

    def read_uint16(self) -> int:
        return int.from_bytes(self.read(2), signed=False, byteorder=self.byte_order)

    def read_int16(self) -> int:
        return int.from_bytes(self.read(2), signed=True, byteorder=self.byte_order)

    def read_uint32(self) -> int:
        return int.from_bytes(self.read(4), signed=False, byteorder=self.byte_order)

    def read_int32(self) -> int:
        return int.from_bytes(self.read(4), signed=True, byteorder=self.byte_order)

    def read_float(self) -> float:
        return struct.unpack(self.endian_symbol + "f", self.read(4))[0]

    def read_cstring(self) -> str:
        string = StringIO()
        while True:
            char = self.read(1)
            if char == b"\x00":
                break
            string.write(char.decode())
        return string.getvalue()