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Copy pathEndianBinaryReader.py
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254 lines (192 loc) · 7.53 KB
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import io
from struct import unpack
from ..math import Color, Matrix4x4, Quaternion, Vector2, Vector3, Vector4, Rectangle
class EndianBinaryReader:
endian: str
Length: int
Position: int
BaseOffset: int
def __new__(cls, item, endian=">", offset=0):
if isinstance(item, (bytes, bytearray, memoryview)):
obj = super(EndianBinaryReader, cls).__new__(
EndianBinaryReader_Memoryview)
else:
obj = super(EndianBinaryReader, cls).__new__(
EndianBinaryReader_Streamable
)
obj.__init__(item, endian)
return obj
def __init__(self, item, endian=">", offset=0):
self.endian = endian
self.BaseOffset = offset
self.Position = 0
@property
def bytes(self):
# implemented by Streamable and Memoryview versions
return b""
def read(self, *args):
# implemented by Streamable and Memoryview versions
return b""
def read_byte(self) -> int:
return unpack(self.endian + "b", self.read(1))[0]
def read_u_byte(self) -> int:
return unpack(self.endian + "B", self.read(1))[0]
def read_bytes(self, num) -> bytes:
return self.read(num)
def read_short(self) -> int:
return unpack(self.endian + "h", self.read(2))[0]
def read_int(self) -> int:
return unpack(self.endian + "i", self.read(4))[0]
def read_long(self) -> int:
return unpack(self.endian + "q", self.read(8))[0]
def read_u_short(self) -> int:
return unpack(self.endian + "H", self.read(2))[0]
def read_u_int(self) -> int:
return unpack(self.endian + "I", self.read(4))[0]
def read_u_long(self) -> int:
return unpack(self.endian + "Q", self.read(8))[0]
def read_float(self) -> float:
return unpack(self.endian + "f", self.read(4))[0]
def read_double(self) -> float:
return unpack(self.endian + "d", self.read(8))[0]
def read_boolean(self) -> bool:
return bool(unpack(self.endian + "?", self.read(1))[0])
def read_string(self, size=None, encoding="utf8") -> str:
if size is None:
ret = self.read_string_to_null()
else:
ret = unpack(f"{self.endian}{size}is", self.read(size))[0]
try:
return ret.decode(encoding)
except UnicodeDecodeError:
return ret
def read_string_to_null(self, max_length=32767) -> str:
ret = []
c = b""
while c != b"\0" and len(ret) < max_length and self.Position != self.Length:
ret.append(c)
c = self.read(1)
if not c:
raise ValueError("Unterminated string: %r" % ret)
return b"".join(ret).decode("utf8", "surrogateescape")
def read_aligned_string(self):
length = self.read_int()
if 0 < length <= self.Length - self.Position:
string_data = bytes(self.read_bytes(length))
result = string_data.decode("utf8", "surrogateescape")
self.align_stream()
return result
return ""
def align_stream(self, alignment=4):
self.Position += (alignment - self.Position % alignment) % alignment
def read_quaternion(self):
return Quaternion(
self.read_float(), self.read_float(), self.read_float(), self.read_float()
)
def read_vector2(self):
return Vector2(self.read_float(), self.read_float())
def read_vector3(self):
return Vector3(self.read_float(), self.read_float(), self.read_float())
def read_vector4(self):
return Vector4(
self.read_float(), self.read_float(), self.read_float(), self.read_float()
)
def read_rectangle_f(self):
return Rectangle(
self.read_float(), self.read_float(), self.read_float(), self.read_float()
)
def read_color4(self):
return Color(
self.read_float(), self.read_float(), self.read_float(), self.read_float()
)
def read_byte_array(self):
return self.read(self.read_int())
def read_matrix(self):
return Matrix4x4(self.read_float_array(16))
def read_array(self, command, length: int):
return [command() for _ in range(length)]
def read_boolean_array(self):
return self.read_array(self.read_boolean, self.read_int())
def read_u_short_array(self):
return self.read_array(self.read_u_short, self.read_int())
def read_int_array(self, length=0):
return self.read_array(self.read_int, length if length else self.read_int())
def read_u_int_array(self, length=0):
return self.read_array(self.read_u_int, length if length else self.read_int())
def read_u_int_array_array(self, length=0):
return self.read_array(
self.read_u_int_array, length if length else self.read_int()
)
def read_float_array(self, length=0):
return self.read_array(self.read_float, length if length else self.read_int())
def read_string_array(self):
return self.read_array(self.read_aligned_string, self.read_int())
def read_vector2_array(self):
return self.read_array(self.read_vector2, self.read_int())
def read_vector4_array(self):
return self.read_array(self.read_vector4, self.read_int())
def read_matrix_array(self):
return self.read_array(self.read_matrix, self.read_int())
def real_offset(self):
""" Returns offset in the underlying file.
(Not working with unpacked streams.)
"""
return self.BaseOffset + self.Position
def read_the_rest(self, obj_start, obj_size):
""" Returns the rest of the current reader bytes."""
return self.read_bytes(obj_size - (self.Position - obj_start))
class EndianBinaryReader_Memoryview(EndianBinaryReader):
view: memoryview
def __init__(self, view, endian=">", offset=0):
super().__init__(view, endian=endian, offset=offset)
self.view = memoryview(view)
self.Length = len(view)
@property
def bytes(self):
return self.view
def dispose(self):
self.view.release()
def read(self, length: int):
if not length:
return b""
ret = self.view[self.Position: self.Position + length]
self.Position += length
return ret
def read_aligned_string(self):
length = self.read_int()
if 0 < length <= self.Length - self.Position:
string_data = self.read_bytes(length)
result = bytes(string_data).decode("utf8", "surrogateescape")
self.align_stream()
return result
return ""
class EndianBinaryReader_Streamable(EndianBinaryReader):
stream: io.BufferedReader
def __init__(self, stream, endian=">", offset=0):
self.stream = stream
super().__init__(stream, endian=endian, offset=offset)
def get_position(self):
return self.stream.tell()
def set_position(self, value):
self.stream.seek(value+self.BaseOffset)
@property
def Length(self):
pos = self.Position
length = self.stream.seek(0, 2) - self.BaseOffset
self.Position = pos
return length
Position = property(get_position, set_position)
@property
def bytes(self):
last_pos = self.Position
self.Position = 0
ret = self.read(self.Length)
self.Position = last_pos
return ret
def dispose(self):
self.stream.close()
pass
def read(self, length: int):
if not length:
return b""
return self.stream.read(length)