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gitea/vendor/github.com/ulikunitz/xz/lzma/breader.go

39 lines
852 B

// Copyright 2014-2019 Ulrich Kunitz. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package lzma
import (
"errors"
"io"
)
// breader provides the ReadByte function for a Reader. It doesn't read
// more data from the reader than absolutely necessary.
type breader struct {
io.Reader
// helper slice to save allocations
p []byte
}
// ByteReader converts an io.Reader into an io.ByteReader.
func ByteReader(r io.Reader) io.ByteReader {
br, ok := r.(io.ByteReader)
if !ok {
return &breader{r, make([]byte, 1)}
}
return br
}
// ReadByte read byte function.
func (r *breader) ReadByte() (c byte, err error) {
n, err := r.Reader.Read(r.p)
if n < 1 {
if err == nil {
err = errors.New("breader.ReadByte: no data")
}
return 0, err
}
return r.p[0], nil
}