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32 lines
612 B
32 lines
612 B
4 years ago
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package limio
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import "io"
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type limitedWriter struct {
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W io.Writer
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N int64
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}
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func (l *limitedWriter) Write(p []byte) (n int, err error) {
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if l.N <= 0 {
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return 0, io.ErrShortWrite
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}
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if int64(len(p)) > l.N {
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p = p[0:l.N]
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err = io.ErrShortWrite
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}
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n, er := l.W.Write(p)
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if er != nil {
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err = er
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}
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l.N -= int64(n)
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return n, err
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}
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// LimitWriter works like io.LimitReader. It writes at most n bytes
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// to the underlying Writer. It returns io.ErrShortWrite if more than n
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// bytes are attempted to be written.
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func LimitWriter(w io.Writer, n int64) io.Writer {
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return &limitedWriter{W: w, N: n}
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}
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