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21 lines
458 B
Go
21 lines
458 B
Go
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package moxio
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import (
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"io"
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)
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// LimitAtReader is a reader at that returns ErrLimit if reads would extend
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// beyond Limit.
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type LimitAtReader struct {
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R io.ReaderAt
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Limit int64
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}
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// ReadAt passes the read on to R, but returns an error if the read data would extend beyond Limit.
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func (r *LimitAtReader) ReadAt(buf []byte, offset int64) (int, error) {
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if offset+int64(len(buf)) > r.Limit {
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return 0, ErrLimit
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}
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return r.R.ReadAt(buf, offset)
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}
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