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hex.go
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hex.go
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// seehuhn.de/go/postscript - a rudimentary PostScript interpreter
// Copyright (C) 2023 Jochen Voss <voss@seehuhn.de>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
package type1
import (
"io"
)
type hexWriter struct {
w io.Writer
buf []byte
}
func (w *hexWriter) Write(p []byte) (n int, err error) {
for _, c := range p {
w.buf = append(w.buf, hex[c>>4], hex[c&0x0f])
n++
if len(w.buf) >= 78 {
if err = w.flush(); err != nil {
return n, err
}
}
}
return len(p), nil
}
func (w *hexWriter) Close() error {
return w.flush()
}
func (w *hexWriter) flush() error {
if len(w.buf) == 0 {
return nil
}
w.buf = append(w.buf, '\n')
_, err := w.w.Write(w.buf)
w.buf = w.buf[:0]
return err
}
const hex = "0123456789abcdef"