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24 lines
424 B
24 lines
424 B
package common
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import (
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"io"
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)
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type PrefixedReader struct {
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Prefix []byte
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reader io.Reader
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}
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func NewPrefixedReader(prefix []byte, reader io.Reader) *PrefixedReader {
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return &PrefixedReader{prefix, reader}
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}
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func (pr *PrefixedReader) Read(p []byte) (n int, err error) {
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if len(pr.Prefix) > 0 {
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read := copy(p, pr.Prefix)
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pr.Prefix = pr.Prefix[read:]
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return read, nil
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} else {
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return pr.reader.Read(p)
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}
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}
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