Nymiro
48 lines
2.1 KiB
Python
48 lines
2.1 KiB
Python
# In heic_types.py
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import struct
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from base import Box # <-- THIS IS THE KEY CHANGE
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class ItemLocation:
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# ... (rest of this class is unchanged)
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def __init__(self, item_id, offset, length):
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self.item_id = item_id
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self.offset = offset
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self.length = length
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def __repr__(self):
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return f"<ItemLocation ID={self.item_id} offset={self.offset} length={self.length}>"
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class ItemLocationBox(Box):
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# ... (rest of this class is unchanged)
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def __init__(self, size: int, box_type: str, offset: int, raw_data: bytes):
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super().__init__(size, box_type, offset, raw_data)
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self.locations = []
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self._parse_locations()
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def _parse_locations(self):
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# ... (all the parsing logic here is unchanged)
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stream = self.raw_data
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version_flags = struct.unpack('>I', stream[:4])[0]
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sizes = struct.unpack('>H', stream[4:6])[0]
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offset_size = (sizes >> 12) & 0x0F
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length_size = (sizes >> 8) & 0x0F
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base_offset_size = (sizes >> 4) & 0x0F
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item_count = struct.unpack('>H', stream[6:8])[0]
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current_pos = 8
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for _ in range(item_count):
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item_id = struct.unpack('>H', stream[current_pos : current_pos+2])[0]
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current_pos += 4 # Skip item_id and construction_method
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current_pos += 2 # Skip data_reference_index
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current_pos += base_offset_size
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extent_count = struct.unpack('>H', stream[current_pos : current_pos+2])[0]
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current_pos += 2
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if extent_count > 0:
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offset = self._read_int(stream, current_pos, offset_size)
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current_pos += offset_size
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length = self._read_int(stream, current_pos, length_size)
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current_pos += length_size
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self.locations.append(ItemLocation(item_id, offset, length))
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def _read_int(self, data, pos, size):
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if size == 1: return data[pos]
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if size == 2: return struct.unpack('>H', data[pos:pos+2])[0]
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if size == 4: return struct.unpack('>I', data[pos:pos+4])[0]
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if size == 8: return struct.unpack('>Q', data[pos:pos+8])[0]
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return 0 |