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