GRPC2PKGXS converts the grpc checksum type to an internal pkg type.

New creates a new storage provider svc.

PKG2GRPCXS converts an internal checksum type to the grpc checksum type.

XSAdler32 means the checksum is adler32.

XSInvalid means the checksum type is invalid.

XSMD5 means the checksum is md5.

XSSHA1 means the checksum is SHA1.

XSSHA256 means the checksum is SHA256.

XSUnset means the checksum is optional.

XS defines an hex-encoded string as checksum.