25 lines
831 B
GDScript
25 lines
831 B
GDScript
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class_name SnapshotFragments
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extends RefCounted
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const PART_BYTES := 1000
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const MAX_PARTS := 64
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var sequence := -1
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var expected := 0
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var pieces: Dictionary[int, PackedByteArray] = {}
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func accept(serial: int, index: int, count: int, bytes: PackedByteArray) -> PackedByteArray:
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if serial < sequence or count < 1 or count > MAX_PARTS or index < 0 or index >= count or bytes.is_empty() or bytes.size() > PART_BYTES:
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return PackedByteArray()
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if serial > sequence:
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sequence = serial
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expected = count
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pieces.clear()
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if count != expected: return PackedByteArray()
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pieces[index] = bytes
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if pieces.size() != count: return PackedByteArray()
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var result := PackedByteArray()
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for i in count: result.append_array(pieces[i])
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pieces.clear()
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expected = 0 # Ignore duplicate fragments of an already applied snapshot.
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return result
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