func Load(ls *persist.LoadSaver) core.Matcher {
le := ls.LoadSmallInt()
if le == 0 {
return nil
}
riffs := make(map[riff.FourCC][]int)
for i := 0; i < le; i++ {
k := riff.FourCC(ls.LoadFourCC())
r := make([]int, ls.LoadSmallInt())
for j := range r {
r[j] = ls.LoadSmallInt()
}
riffs[k] = r
}
return &Matcher{
riffs: riffs,
priorities: priority.Load(ls),
}
}
func Add(c core.Matcher, ss core.SignatureSet, p priority.List) (core.Matcher, int, error) {
sigs, ok := ss.(SignatureSet)
if !ok {
return nil, -1, fmt.Errorf("RIFFmatcher: can't cast persist set")
}
if len(sigs) == 0 {
return c, 0, nil
}
var m *Matcher
if c == nil {
m = &Matcher{
riffs: make(map[riff.FourCC][]int),
priorities: &priority.Set{},
}
} else {
m = c.(*Matcher)
}
var length int
// unless it is a new matcher, calculate current length by iterating through all the result values
if len(m.riffs) > 0 {
for _, v := range m.riffs {
for _, w := range v {
if w > length {
length = w
}
}
}
length++ // add one - because the result values are indexes
}
for i, v := range sigs {
cc := riff.FourCC(v)
_, ok := m.riffs[cc]
if ok {
m.riffs[cc] = append(m.riffs[cc], i+length)
} else {
m.riffs[cc] = []int{i + length}
}
}
// add priorities
m.priorities.Add(p, len(sigs), 0, 0)
return m, length + len(sigs), nil
}