27 lines
958 B
Python
27 lines
958 B
Python
import ctypes
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from blake3 import blake3
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# Windows atributy pro cloud/placeholder soubory
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_FILE_ATTRIBUTE_OFFLINE = 0x00001000
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_FILE_ATTRIBUTE_RECALL_ON_OPEN = 0x00040000
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_FILE_ATTRIBUTE_RECALL_ON_DATA_ACCESS = 0x00400000
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_CLOUD_MASK = _FILE_ATTRIBUTE_OFFLINE | _FILE_ATTRIBUTE_RECALL_ON_OPEN | _FILE_ATTRIBUTE_RECALL_ON_DATA_ACCESS
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def is_cloud_placeholder(path: str) -> bool:
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"""Vrátí True pokud soubor není lokálně stažený (Dropbox/OneDrive placeholder)."""
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attrs = ctypes.windll.kernel32.GetFileAttributesW(path)
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if attrs == 0xFFFFFFFF: # INVALID_FILE_ATTRIBUTES
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return False
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return bool(attrs & _CLOUD_MASK)
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def blake3_file(path, chunk_size=1024 * 1024):
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"""Spočítá BLAKE3 hash souboru po blocích (bez načtení do paměti)."""
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h = blake3()
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with open(path, "rb") as f:
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for chunk in iter(lambda: f.read(chunk_size), b""):
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h.update(chunk)
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return h.digest()
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