27 lines
502 B
Go
27 lines
502 B
Go
package countrw
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import (
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"io"
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"sync/atomic"
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)
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type CountReader struct {
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r io.Reader
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c *uint64
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}
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func NewCountReader(r io.Reader) *CountReader {
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return &CountReader{r: r, c: new(uint64)}
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}
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func (c *CountReader) Reset() { atomic.StoreUint64(c.c, 0) }
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func (c *CountReader) Count() uint64 { return atomic.LoadUint64(c.c) }
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func (c *CountReader) Read(p []byte) (int, error) {
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n, err := c.r.Read(p)
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atomic.AddUint64(c.c, uint64(n))
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return n, err
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}
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var _ io.Reader = (*CountReader)(nil)
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