func (fs *frameSet) index(buf *siegreader.Buffer, rev bool, quit chan struct{}) chan fsmatch {
ret := make(chan fsmatch)
go func() {
var i int
for {
select {
case <-quit:
close(ret)
return
default:
}
if i >= len(fs.set) {
close(ret)
return
}
f := fs.set[i]
var match bool
var matches []int
if rev {
slc, err := buf.EofSlice(0, frames.TotalLength(f))
if err != nil {
close(ret)
return
}
match, matches = f.MatchR(slc)
} else {
slc, err := buf.Slice(0, frames.TotalLength(f))
if err != nil {
close(ret)
return
}
match, matches = f.Match(slc)
}
if match {
var min int
if !rev {
min, _ = f.Length()
}
for _, off := range matches {
ret <- fsmatch{i, int64(off - min), min}
}
}
i++
}
close(ret)
}()
return ret
}
func (t *testNode) length() int {
return frames.TotalLength(t.Frame)
}