// Pronom creates a pronom object func newPronom() (*pronom, error) { p := &pronom{} // apply no container rule if !config.NoContainer() && !config.Inspect() { if err := p.setContainers(); err != nil { return nil, fmt.Errorf("Pronom: error loading containers; got %s\nUnless you have set `-nocontainer` you need to download a container signature file", err) } } if err := p.setParseables(); err != nil { return nil, err } if config.Inspect() { return p, nil } // apply noPriority rule if !config.NoPriority() { p.pm = p.j.Priorities() p.pm.Complete() } return p, nil }
// set parseables joins signatures in the DROID signature file with any extra reports and adds that to the pronom object func (p *pronom) setParseables() error { d, err := newDroid(config.Droid()) if err != nil { return fmt.Errorf("Pronom: error loading Droid file; got %s\nYou must have a Droid file to build a signature", err) } // if we are just inspecting a single report file if config.Inspect() { r, err := newReports(config.Limit(d.IDs()), nil) if err != nil { return fmt.Errorf("Pronom: error loading reports; got %s\nYou must download PRONOM reports to build a signature (unless you use the -noreports flag). You can use `roy harvest` to download reports", err) } is := infos(r.Infos()) sigs, puids, err := r.Signatures() if err != nil { return fmt.Errorf("Pronom: parsing signatures; got %s", err) } var puid string for i, sig := range sigs { if puids[i] != puid { puid = puids[i] fmt.Printf("%s: \n", is[puid].name) } fmt.Println(sig) } p.j = r return nil } // apply limit or exclude filters (only one can be applied) puids := d.IDs() if config.HasLimit() { puids = config.Limit(puids) } else if config.HasExclude() { puids = config.Exclude(puids) } // if noreports set if config.Reports() == "" { p.j = d // apply filter if config.HasLimit() || config.HasExclude() { p.j = parseable.Filter(puids, p.j) } } else { // otherwise build from reports r, err := newReports(puids, d.idsPuids()) if err != nil { return fmt.Errorf("Pronom: error loading reports; got %s\nYou must download PRONOM reports to build a signature (unless you use the -noreports flag). You can use `roy harvest` to download reports", err) } p.j = r } // exclude byte signatures where also have container signatures, unless doubleup set if !config.DoubleUp() { p.j = &doublesFilter{ config.ExcludeDoubles(puids, p.c.Puids()), p.j, } } // add extensions for _, v := range config.Extend() { e, err := newDroid(v) if err != nil { return fmt.Errorf("Pronom: error loading extension file; got %s", err) } p.j = parseable.Join(p.j, e) } // mirror PREV wild segments into EOF if maxBof and maxEOF set if config.MaxBOF() > 0 && config.MaxEOF() > 0 { p.j = &parseable.Mirror{p.j} } return nil }