MPH domian matcher: Support building & using cache directly (instead of building from geosite.dat when Xray starts) (#5505)

Like https://github.com/XTLS/Xray-core/pull/5488#issuecomment-3710995080

common/strmatcher/mph_matcher_compact.go

@@ -0,0 +1,47 @@
+package strmatcher
+
+import (
+	"bytes"
+	"encoding/gob"
+	"io"
+)
+
+func init() {
+	gob.Register(&RegexMatcher{})
+	gob.Register(fullMatcher(""))
+	gob.Register(substrMatcher(""))
+	gob.Register(domainMatcher(""))
+}
+
+func (g *MphMatcherGroup) Serialize(w io.Writer) error {
+	data := MphMatcherGroup{
+		Ac:            g.Ac,
+		OtherMatchers: g.OtherMatchers,
+		Rules:         g.Rules,
+		Level0:        g.Level0,
+		Level0Mask:    g.Level0Mask,
+		Level1:        g.Level1,
+		Level1Mask:    g.Level1Mask,
+		Count:         g.Count,
+	}
+	return gob.NewEncoder(w).Encode(data)
+}
+
+func NewMphMatcherGroupFromBuffer(data []byte) (*MphMatcherGroup, error) {
+	var gData MphMatcherGroup
+	if err := gob.NewDecoder(bytes.NewReader(data)).Decode(&gData); err != nil {
+		return nil, err
+	}
+
+	g := NewMphMatcherGroup()
+	g.Ac = gData.Ac
+	g.OtherMatchers = gData.OtherMatchers
+	g.Rules = gData.Rules
+	g.Level0 = gData.Level0
+	g.Level0Mask = gData.Level0Mask
+	g.Level1 = gData.Level1
+	g.Level1Mask = gData.Level1Mask
+	g.Count = gData.Count
+
+	return g, nil
+}