Ejemplo n.º 1
0
// NewReadCloserWrapper returns a wrapper which puts the bufio.Reader back
// into the pool and closes the reader if it's an io.ReadCloser.
func (bufPool *BufioReaderPool) NewReadCloserWrapper(buf *bufio.Reader, r io.Reader) io.ReadCloser {
	return ioutils.NewReadCloserWrapper(r, func() error {
		if readCloser, ok := r.(io.ReadCloser); ok {
			readCloser.Close()
		}
		bufPool.Put(buf)
		return nil
	})
}
Ejemplo n.º 2
0
// DecompressStream decompress the archive and returns a ReaderCloser with the decompressed archive.
func DecompressStream(archive io.Reader) (io.ReadCloser, error) {
	p := pools.BufioReader32KPool
	buf := p.Get(archive)
	bs, err := buf.Peek(10)
	if err != nil && err != io.EOF {
		// Note: we'll ignore any io.EOF error because there are some odd
		// cases where the layer.tar file will be empty (zero bytes) and
		// that results in an io.EOF from the Peek() call. So, in those
		// cases we'll just treat it as a non-compressed stream and
		// that means just create an empty layer.
		// See Issue 18170
		return nil, err
	}

	compression := DetectCompression(bs)
	switch compression {
	case Uncompressed:
		readBufWrapper := p.NewReadCloserWrapper(buf, buf)
		return readBufWrapper, nil
	case Gzip:
		gzReader, err := gzip.NewReader(buf)
		if err != nil {
			return nil, err
		}
		readBufWrapper := p.NewReadCloserWrapper(buf, gzReader)
		return readBufWrapper, nil
	case Bzip2:
		bz2Reader := bzip2.NewReader(buf)
		readBufWrapper := p.NewReadCloserWrapper(buf, bz2Reader)
		return readBufWrapper, nil
	case Xz:
		xzReader, chdone, err := xzDecompress(buf)
		if err != nil {
			return nil, err
		}
		readBufWrapper := p.NewReadCloserWrapper(buf, xzReader)
		return ioutils.NewReadCloserWrapper(readBufWrapper, func() error {
			<-chdone
			return readBufWrapper.Close()
		}), nil
	default:
		return nil, fmt.Errorf("Unsupported compression format %s", (&compression).Extension())
	}
}
Ejemplo n.º 3
0
// DecompressStream decompress the archive and returns a ReaderCloser with the decompressed archive.
func DecompressStream(archive io.Reader) (io.ReadCloser, error) {
	p := pools.BufioReader32KPool
	buf := p.Get(archive)
	bs, err := buf.Peek(10)
	if err != nil {
		return nil, err
	}

	compression := DetectCompression(bs)
	switch compression {
	case Uncompressed:
		readBufWrapper := p.NewReadCloserWrapper(buf, buf)
		return readBufWrapper, nil
	case Gzip:
		gzReader, err := gzip.NewReader(buf)
		if err != nil {
			return nil, err
		}
		readBufWrapper := p.NewReadCloserWrapper(buf, gzReader)
		return readBufWrapper, nil
	case Bzip2:
		bz2Reader := bzip2.NewReader(buf)
		readBufWrapper := p.NewReadCloserWrapper(buf, bz2Reader)
		return readBufWrapper, nil
	case Xz:
		xzReader, chdone, err := xzDecompress(buf)
		if err != nil {
			return nil, err
		}
		readBufWrapper := p.NewReadCloserWrapper(buf, xzReader)
		return ioutils.NewReadCloserWrapper(readBufWrapper, func() error {
			<-chdone
			return readBufWrapper.Close()
		}), nil
	default:
		return nil, fmt.Errorf("Unsupported compression format %s", (&compression).Extension())
	}
}