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package shp
import (
"fmt"
"io"
)
// errReader is a helper to perform multiple successive read from another reader
// and do the error checking only once afterwards. It will not perform any new
// reads in case there was an error encountered earlier.
type errReader struct {
io.Reader
e error
n int64
}
func (er *errReader) Read(p []byte) (n int, err error) {
if er.e != nil {
return 0, fmt.Errorf("unable to read after previous error: %v", er.e)
}
n, er.e = er.Reader.Read(p)
er.n += int64(n)
return n, er.e
}
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