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								// Copyright 2024 GoEdge CDN goedge.cdn@gmail.com. All rights reserved. Official site: https://goedge.cloud .
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								package bfs
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								import (
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									"errors"
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									"os"
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								)
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								var ErrClosed = errors.New("the file closed")
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								var ErrInvalidHash = errors.New("invalid hash")
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								var ErrFileIsWriting = errors.New("the file is writing")
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								func IsWritingErr(err error) bool {
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									return err != nil && errors.Is(err, ErrFileIsWriting)
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								}
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								func IsNotExist(err error) bool {
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									return err != nil && os.IsNotExist(err)
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								}
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