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package main
import (
"encoding/hex"
"io"
)
const bufsize = 256
type hexdump struct {
w io.Writer
buf [bufsize]byte
}
func hexoutput(w io.Writer) io.WriteCloser {
return &hexdump{w: w}
}
func (h *hexdump) Write(data []byte) (n int, err error) {
for n < len(data) {
amt := len(data) - n
if hex.EncodedLen(amt) > bufsize {
amt = hex.DecodedLen(bufsize)
}
nn := hex.Encode(h.buf[:], data[n:n+amt])
_, err := h.w.Write(h.buf[:nn])
n += amt
if err != nil {
return n, err
}
}
return n, nil
}
func (h *hexdump) Close() error {
_, err := h.w.Write([]byte{'\n'})
return err
}
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