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register.go
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register.go
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package fastzip
import (
"io"
"sync"
stdflate "compress/flate"
"github.com/klauspost/compress/flate"
)
type flater interface {
Close() error
Flush() error
Reset(dst io.Writer)
Write(data []byte) (n int, err error)
}
func newFlateReaderPool(newReaderFn func(w io.Reader) io.ReadCloser) *sync.Pool {
pool := &sync.Pool{}
pool.New = func() interface{} {
return &flateReader{pool, newReaderFn(nil)}
}
return pool
}
type flateReader struct {
pool *sync.Pool
io.ReadCloser
}
func (fr *flateReader) Reset(r io.Reader) {
fr.ReadCloser.(flate.Resetter).Reset(r, nil)
}
func (fr *flateReader) Close() error {
err := fr.ReadCloser.Close()
fr.pool.Put(fr)
return err
}
// FlateDecompressor returns a pooled performant zip.Decompressor.
func FlateDecompressor() func(r io.Reader) io.ReadCloser {
pool := newFlateReaderPool(flate.NewReader)
return func(r io.Reader) io.ReadCloser {
fr := pool.Get().(*flateReader)
fr.Reset(r)
return fr
}
}
// StdFlateDecompressor returns a pooled standard library zip.Decompressor.
func StdFlateDecompressor() func(r io.Reader) io.ReadCloser {
pool := newFlateReaderPool(stdflate.NewReader)
return func(r io.Reader) io.ReadCloser {
fr := pool.Get().(*flateReader)
fr.Reset(r)
return fr
}
}
func newFlateWriterPool(level int, newWriterFn func(w io.Writer, level int) (flater, error)) *sync.Pool {
pool := &sync.Pool{}
pool.New = func() interface{} {
fw, err := newWriterFn(nil, level)
if err != nil {
panic(err)
}
return &flateWriter{pool, fw}
}
return pool
}
type flateWriter struct {
pool *sync.Pool
flater
}
func (fw *flateWriter) Reset(w io.Writer) {
fw.flater.Reset(w)
}
func (fw *flateWriter) Close() error {
err := fw.flater.Close()
fw.pool.Put(fw)
return err
}
// FlateCompressor returns a pooled performant zip.Compressor configured to a
// specified compression level. Invalid flate levels will panic.
func FlateCompressor(level int) func(w io.Writer) (io.WriteCloser, error) {
pool := newFlateWriterPool(level, func(w io.Writer, level int) (flater, error) {
return flate.NewWriter(w, level)
})
return func(w io.Writer) (io.WriteCloser, error) {
fw := pool.Get().(*flateWriter)
fw.Reset(w)
return fw, nil
}
}
// StdFlateCompressor returns a pooled standard library zip.Compressor
// configured to a specified compression level. Invalid flate levels will
// panic.
func StdFlateCompressor(level int) func(w io.Writer) (io.WriteCloser, error) {
pool := newFlateWriterPool(level, func(w io.Writer, level int) (flater, error) {
return stdflate.NewWriter(w, level)
})
return func(w io.Writer) (io.WriteCloser, error) {
fw := pool.Get().(*flateWriter)
fw.Reset(w)
return fw, nil
}
}