)// UnixfsAPI is the basic interface to immutable files in IPFStypeUnixfsAPIinterface{// Add imports the data from the reader into merkledag fileAdd(context.Context,io.Reader)(Path,error)// Cat returns a reader for the fileCat(context.Context,Path)(Reader,error)// Ls returns the list of links in a directoryLs(context.Context,Path)([]*ipld.Link,error)}