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matchreader.go
56 lines (47 loc) · 1006 Bytes
/
matchreader.go
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// SPDX-FileCopyrightText: 2022 SAP SE or an SAP affiliate company and Open Component Model contributors.
//
// SPDX-License-Identifier: Apache-2.0
package compression
import (
"bytes"
"io"
)
type MatchReader interface {
io.Reader
Reset()
}
type matchReader struct {
read []byte
buffer *bytes.Buffer
reader io.Reader
current io.Reader
}
var _ MatchReader = (*matchReader)(nil)
func NewMatchReader(r io.Reader) *matchReader {
return &matchReader{
buffer: bytes.NewBuffer(nil),
reader: r,
current: r,
}
}
func (r *matchReader) Read(buf []byte) (int, error) {
n, err := r.current.Read(buf)
if n > 0 {
_, err = r.buffer.Write(buf[:n])
}
return n, err
}
func (r *matchReader) Reset() {
if r.buffer.Len() > 0 {
if r.buffer.Len() > len(r.read) {
r.read = r.buffer.Bytes()
}
r.buffer = bytes.NewBuffer(nil)
r.current = io.MultiReader(bytes.NewBuffer(r.read), r.reader)
}
}
func (r *matchReader) Reader() io.Reader {
r.Reset()
r.reader = nil
return r.current
}