func (i *Identifier) Recognise(m core.MatcherType, idx int) (bool, string) {
switch m {
default:
return false, ""
case core.ExtensionMatcher:
if idx >= i.eStart && idx < i.eStart+len(i.ePuids) {
idx = idx - i.eStart
return true, i.name + ": " + i.ePuids[idx]
}
return false, ""
case core.MIMEMatcher:
if idx >= i.mStart && idx < i.mStart+len(i.mPuids) {
idx = idx - i.mStart
return true, i.name + ": " + i.mPuids[idx]
}
return false, ""
case core.ContainerMatcher:
if idx >= i.cStart && idx < i.cStart+len(i.cPuids) {
idx = idx - i.cStart
return true, i.name + ": " + i.cPuids[idx]
}
return false, ""
case core.ByteMatcher:
if idx >= i.bStart && idx < i.bStart+len(i.bPuids) {
return true, i.name + ": " + i.bPuids[idx]
}
return false, ""
case core.TextMatcher:
if idx == i.tStart {
return true, i.name + ": " + config.TextPuid()
}
return false, ""
}
}
// add adds extension, bytematcher or containermatcher signatures to the identifier
func (p *pronom) add(m core.Matcher, t core.MatcherType) error {
switch t {
default:
return fmt.Errorf("Pronom: unknown matcher type %d", t)
case core.ExtensionMatcher:
if !config.NoExt() {
var exts [][]string
exts, p.ePuids = p.j.Globs()
l, err := m.Add(stringmatcher.SignatureSet(exts), nil)
if err != nil {
return err
}
p.eStart = l - len(p.ePuids)
return nil
}
case core.MIMEMatcher:
if !config.NoMIME() {
var mimes [][]string
mimes, p.mPuids = p.j.MIMEs()
l, err := m.Add(stringmatcher.SignatureSet(mimes), nil)
if err != nil {
return err
}
p.mStart = l - len(p.mPuids)
return nil
}
case core.ContainerMatcher:
return p.contMatcher(m)
case core.ByteMatcher:
var sigs []frames.Signature
var err error
sigs, p.bPuids, err = p.j.Signatures()
if err != nil {
return err
}
var plist priority.List
if !config.NoPriority() {
plist = p.pm.List(p.bPuids)
}
l, err := m.Add(bytematcher.SignatureSet(sigs), plist)
if err != nil {
return err
}
p.bStart = l - len(p.bPuids)
case core.TextMatcher:
if !config.NoText() && p.hasPuid(config.TextPuid()) {
l, _ := m.Add(textmatcher.SignatureSet{}, nil)
p.tStart = l
}
}
return nil
}
func (r *Recorder) Satisfied(mt core.MatcherType) bool {
if r.cscore < incScore {
if mt == core.ByteMatcher {
return false
}
if len(r.ids) == 0 {
return false
}
for _, res := range r.ids {
if res.Puid == config.TextPuid() {
return false
}
}
}
r.satisfied = true
return true
}
// add adds extension, bytematcher or containermatcher signatures to the identifier
func (p *pronom) add(m core.Matcher) error {
switch t := m.(type) {
default:
return fmt.Errorf("Pronom: unknown matcher type %T", t)
case extensionmatcher.Matcher:
if !config.NoExt() {
var exts [][]string
exts, p.ePuids = p.j.extensions()
l, err := m.Add(extensionmatcher.SignatureSet(exts), nil)
if err != nil {
return err
}
p.eStart = l - len(p.ePuids)
return nil
}
case containermatcher.Matcher:
return p.contMatcher(m)
case *bytematcher.Matcher:
var sigs []frames.Signature
var err error
sigs, p.bPuids, err = p.j.signatures()
if err != nil {
return err
}
var plist priority.List
if !config.NoPriority() {
plist = p.pm.List(p.bPuids)
}
l, err := m.Add(bytematcher.SignatureSet(sigs), plist)
if err != nil {
return err
}
p.bStart = l - len(p.bPuids)
case *textmatcher.Matcher:
if !config.NoText() && p.hasPuid(config.TextPuid()) {
l, _ := m.Add(textmatcher.SignatureSet{}, nil)
p.tStart = l
}
}
return nil
}
func (r *Recorder) Report(res chan core.Identification) {
if len(r.ids) > 0 {
// if we don't have priority set, apply a warning
if r.noPriority {
for i := range r.ids {
r.ids[i].Warning = "no priority set for this identifier"
}
}
sort.Sort(r.ids)
conf := r.ids[0].confidence
// if we've only got extension / mime matches, check if those matches are ruled out by lack of byte match
// only permit a single extension or mime only match
// add warnings too
if conf <= textScore {
nids := make([]Identification, 0, 1)
for _, v := range r.ids {
// if overall confidence is greater than mime or ext only, then rule out any lesser confident matches
if conf > mimeScore && v.confidence != conf {
break
}
// if we have plain text result that is based on ext or mime only,
// and not on a text match, and if text matcher is on for this identifier,
// then don't report a text match
if v.Puid == config.TextPuid() && conf < textScore && r.textActive {
continue
}
// if the match has no corresponding byte or container signature...
if ok := r.hasSig(v.Puid); !ok {
// break immediately if more than one match
if len(nids) > 0 {
nids = nids[:0]
break
}
if len(v.Warning) > 0 {
v.Warning += "; " + "match on " + lowConfidence(v.confidence) + " only"
} else {
v.Warning = "match on " + lowConfidence(v.confidence) + " only"
}
nids = append(nids, v)
}
}
if len(nids) != 1 {
poss := make([]string, len(r.ids))
for i, v := range r.ids {
poss[i] = v.Puid
conf = conf | v.confidence
}
nids = []Identification{Identification{r.name, "UNKNOWN", "", "", "", nil, fmt.Sprintf("no match; possibilities based on %v are %v", lowConfidence(conf), strings.Join(poss, ", ")), 0, 0}}
}
r.ids = nids
}
res <- r.checkActive(r.ids[0])
if len(r.ids) > 1 {
for i, v := range r.ids[1:] {
if v.confidence == conf || (r.noPriority && v.confidence >= incScore) {
res <- r.checkActive(r.ids[i+1])
} else {
break
}
}
}
} else {
res <- Identification{r.name, "UNKNOWN", "", "", "", nil, "no match", 0, 0}
}
}
func (r *Recorder) Record(m core.MatcherType, res core.Result) bool {
switch m {
default:
return false
case core.ExtensionMatcher:
if res.Index() >= r.eStart && res.Index() < r.eStart+len(r.ePuids) {
idx := res.Index() - r.eStart
r.ids = add(r.ids, r.name, r.ePuids[idx], r.infos[r.ePuids[idx]], res.Basis(), extScore)
return true
} else {
return false
}
case core.MIMEMatcher:
if res.Index() >= r.mStart && res.Index() < r.mStart+len(r.mPuids) {
idx := res.Index() - r.mStart
r.ids = add(r.ids, r.name, r.mPuids[idx], r.infos[r.mPuids[idx]], res.Basis(), mimeScore)
return true
} else {
return false
}
case core.ContainerMatcher:
// add zip default
if res.Index() < 0 {
if r.zipDefault {
r.cscore += incScore
r.ids = add(r.ids, r.name, config.ZipPuid(), r.infos[config.ZipPuid()], res.Basis(), r.cscore)
}
return false
}
if res.Index() >= r.cStart && res.Index() < r.cStart+len(r.cPuids) {
idx := res.Index() - r.cStart
r.cscore += incScore
basis := res.Basis()
p, t := place(idx, r.cPuids)
if t > 1 {
basis = basis + fmt.Sprintf(" (signature %d/%d)", p, t)
}
r.ids = add(r.ids, r.name, r.cPuids[idx], r.infos[r.cPuids[idx]], basis, r.cscore)
return true
} else {
return false
}
case core.ByteMatcher:
if res.Index() >= r.bStart && res.Index() < r.bStart+len(r.bPuids) {
if r.satisfied {
return true
}
idx := res.Index() - r.bStart
r.cscore += incScore
basis := res.Basis()
p, t := place(idx, r.bPuids)
if t > 1 {
basis = basis + fmt.Sprintf(" (signature %d/%d)", p, t)
}
r.ids = add(r.ids, r.name, r.bPuids[idx], r.infos[r.bPuids[idx]], basis, r.cscore)
return true
} else {
return false
}
case core.TextMatcher:
if res.Index() == r.tStart {
if r.satisfied {
return true
}
r.ids = add(r.ids, r.name, config.TextPuid(), r.infos[config.TextPuid()], res.Basis(), textScore)
return true
} else {
return false
}
}
}