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reader.go
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reader.go
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package deflate
import (
"errors"
"io"
"sync"
"github.com/bodgit/sevenzip/internal/util"
"github.com/klauspost/compress/flate"
)
//nolint:gochecknoglobals
var flateReaderPool sync.Pool
type readCloser struct {
c io.Closer
fr io.ReadCloser
}
func (rc *readCloser) Close() error {
var err error
if rc.c != nil {
if err = rc.fr.Close(); err != nil {
return err
}
flateReaderPool.Put(rc.fr)
err = rc.c.Close()
rc.c, rc.fr = nil, nil
}
return err
}
func (rc *readCloser) Read(p []byte) (int, error) {
if rc.fr == nil {
return 0, errors.New("deflate: Read after Close")
}
return rc.fr.Read(p)
}
// NewReader returns a new DEFLATE io.ReadCloser.
func NewReader(_ []byte, _ uint64, readers []io.ReadCloser) (io.ReadCloser, error) {
if len(readers) != 1 {
return nil, errors.New("deflate: need exactly one reader")
}
fr, ok := flateReaderPool.Get().(io.ReadCloser)
if ok {
frf, ok := fr.(flate.Resetter)
if ok {
if err := frf.Reset(util.ByteReadCloser(readers[0]), nil); err != nil {
return nil, err
}
}
} else {
fr = flate.NewReader(util.ByteReadCloser(readers[0]))
}
return &readCloser{
c: readers[0],
fr: fr,
}, nil
}