github.com/sagernet/quic-go@v0.43.1-beta.1/http3/gzip_reader.go (about)

     1  package http3
     2  
     3  // copied from net/transport.go
     4  
     5  // gzipReader wraps a response body so it can lazily
     6  // call gzip.NewReader on the first call to Read
     7  import (
     8  	"compress/gzip"
     9  	"io"
    10  )
    11  
    12  // call gzip.NewReader on the first call to Read
    13  type gzipReader struct {
    14  	body io.ReadCloser // underlying Response.Body
    15  	zr   *gzip.Reader  // lazily-initialized gzip reader
    16  	zerr error         // sticky error
    17  }
    18  
    19  func newGzipReader(body io.ReadCloser) io.ReadCloser {
    20  	return &gzipReader{body: body}
    21  }
    22  
    23  func (gz *gzipReader) Read(p []byte) (n int, err error) {
    24  	if gz.zerr != nil {
    25  		return 0, gz.zerr
    26  	}
    27  	if gz.zr == nil {
    28  		gz.zr, err = gzip.NewReader(gz.body)
    29  		if err != nil {
    30  			gz.zerr = err
    31  			return 0, err
    32  		}
    33  	}
    34  	return gz.zr.Read(p)
    35  }
    36  
    37  func (gz *gzipReader) Close() error {
    38  	return gz.body.Close()
    39  }