38 lines
1.0 KiB
Python
38 lines
1.0 KiB
Python
# https://www.discferret.com/wiki/Apple_DiskCopy_4.2
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from ctypes import BigEndianStructure, c_byte, c_char, c_uint32, c_uint16
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from typing import BinaryIO
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NAME_SIZE = 63
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class DiskCopyImageHeader(BigEndianStructure):
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_pack_ = 1
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_fields_ = [
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('name_length', c_byte),
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('name', c_char * NAME_SIZE),
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('data_size', c_uint32),
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('tag_size', c_uint32),
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('data_checksum', c_uint32),
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('tag_checksum', c_uint32),
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('disk_type', c_byte),
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('format', c_byte),
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('magic_number', c_uint16),
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]
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def read_data(self, f: BinaryIO) -> bytes:
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if self.magic_number != 0x0100:
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raise ValueError('Invalid Magic Number')
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data = f.read(self.data_size)
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if len(data) != self.data_size:
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raise ValueError('Unexpected EOF')
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# TODO: Checksum verification?
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return data
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@property
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def image_name(self) -> bytes:
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return self.name[:min(self.name_length, NAME_SIZE)]
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