prophet-3df-importer/binary_reader.py at main · jmancoder/prophet-3df-importer · GitHub

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from io import BytesIO
import struct
from typing import Literal

from mathutils import Euler, Matrix


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_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_vec4B(self) -> tuple[int, int, int, int]:
        return struct.unpack(self.endian_symbol + "4B", self.read(4))

    def read_vec3H(self) -> tuple[int, int, int]:
        return struct.unpack(self.endian_symbol + "3H", self.read(6))

    def read_vec3I(self) -> tuple[int, int, int]:
        return struct.unpack(self.endian_symbol + "3I", self.read(12))

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

    def read_vec2f(self) -> tuple[float, float]:
        return struct.unpack(self.endian_symbol + "2f", self.read(8))

    def read_vec3f(self) -> tuple[float, float, float]:
        return struct.unpack(self.endian_symbol + "3f", self.read(12))

    def read_vec4f(self) -> tuple[float, float, float, float]:
        return struct.unpack(self.endian_symbol + "4f", self.read(16))

    def read_rgba(self) -> tuple[float, float, float, float]:
        r, g, b, a = self.read_vec4B()
        return (r / 255, g / 255, b / 255, a / 255)

    def read_bgra(self) -> tuple[float, float, float, float]:
        b, g, r, a = self.read_vec4B()
        return (r / 255, g / 255, b / 255, a / 255)

    def read_loc_rot_scale(self) -> Matrix:
        location = self.read_vec3f()
        rotation = Euler(self.read_vec3f())
        scale = self.read_vec3f()
        return Matrix.LocRotScale(location, rotation, scale)

    def read_matrix_3x4(self) -> Matrix:
        rows = [self.read_vec3f() for _ in range(4)]
        return Matrix(rows).to_4x4().transposed()

    def read_matrix_4x3(self) -> Matrix:
        rows = [self.read_vec4f() for _ in range(3)]
        return Matrix(rows).to_4x4().transposed()

    def read_matrix_4x4(self) -> Matrix:
        rows = [self.read_vec4f() for _ in range(4)]
        return Matrix(rows).transposed()

    def read_string_block(self, length: int) -> str:
        text = self.read(length).decode(errors="ignore")
        return text.split("\x00")[0]