// SizedDigests returns the hash+size part of each data block
// referenced by the collection.
+//
+// Zero-length blocks are not included.
func (c *Collection) SizedDigests() ([]SizedDigest, error) {
manifestText := c.ManifestText
if manifestText == "" {
// FIXME: ensure it's a file token
break
}
+ if strings.HasPrefix(token, "d41d8cd98f00b204e9800998ecf8427e+0") {
+ // Exclude "empty block" placeholder
+ continue
+ }
// FIXME: shouldn't assume 32 char hash
if i := strings.IndexRune(token[33:], '+'); i >= 0 {
token = token[:33+i]