github.com/rck/u-root@v0.0.0-20180106144920-7eb602e381bb/pkg/gzip/gunzip.go (about)

     1  package gzip
     2  
     3  import (
     4  	"io"
     5  
     6  	"github.com/klauspost/pgzip"
     7  )
     8  
     9  // Decompress takes gzip compressed input from io.Reader and expands it using pgzip
    10  // to io.Writer. Data is read in blocksize (KB) chunks using upto the number of
    11  // CPU cores specified.
    12  func Decompress(r io.Reader, w io.Writer, blocksize int, processes int) error {
    13  	zr, err := pgzip.NewReaderN(r, blocksize*1024, processes)
    14  	if err != nil {
    15  		return err
    16  	}
    17  
    18  	if _, err := io.Copy(w, zr); err != nil {
    19  		zr.Close()
    20  		return err
    21  	}
    22  
    23  	return zr.Close()
    24  }