D2data treasure class (#631)

* added loader for TreasureClassEx.txt

* fix lint error

d2app/app.go

@@ -245,6 +245,7 @@ func (a *App) loadDataDict() error {
 		{d2resource.Sets, d2datadict.LoadSets},
 		{d2resource.SetItems, d2datadict.LoadSetItems},
 		{d2resource.AutoMagic, d2datadict.LoadAutoMagicRecords},
+		{d2resource.TreasureClass, d2datadict.LoadTreasureClassRecords},
 	}
 
 	d2datadict.InitObjectRecords()

d2common/d2data/d2datadict/treasure_class.go

@@ -0,0 +1,91 @@
+package d2datadict
+
+import (
+	"fmt"
+	"log"
+
+	"github.com/OpenDiablo2/OpenDiablo2/d2common"
+)
+
+const (
+	numTreasures    = 10
+	treasureItemFmt = "Item%d"
+	treasureProbFmt = "Prob%d"
+)
+
+// TreasureClassRecord represents a rule for item drops in diablo 2
+type TreasureClassRecord struct {
+	Name       string
+	Group      int
+	Level      int
+	NumPicks   int
+	FreqUnique int
+	FreqSet    int
+	FreqRare   int
+	FreqMagic  int
+	FreqNoDrop int
+	Treasures  []*Treasure
+}
+
+// Treasure describes a treasure to drop
+// the key is either a reference to an item, or to another treasure class
+type Treasure struct {
+	Name        string
+	Probability int
+}
+
+var TreasureClass map[string]*TreasureClassRecord //nolint:gochecknoglobals // Currently global by design
+
+// LoadTreasureClassRecords loads treasure class records from TreasureClassEx.txt
+//nolint:funlen // Makes no sense to split
+func LoadTreasureClassRecords(file []byte) {
+	TreasureClass = make(map[string]*TreasureClassRecord)
+
+	d := d2common.LoadDataDictionary(file)
+
+	for d.Next() {
+		record := &TreasureClassRecord{
+			Name:       d.String("Treasure Class"),
+			Group:      d.Number("group"),
+			Level:      d.Number("level"),
+			NumPicks:   d.Number("Picks"),
+			FreqUnique: d.Number("Unique"),
+			FreqSet:    d.Number("Set"),
+			FreqRare:   d.Number("Rare"),
+			FreqMagic:  d.Number("Magic"),
+			FreqNoDrop: d.Number("NoDrop"),
+		}
+
+		for treasureIdx := 0; treasureIdx < numTreasures; treasureIdx++ {
+			treasureColumnKey := fmt.Sprintf(treasureItemFmt, treasureIdx+1)
+			probColumnKey := fmt.Sprintf(treasureProbFmt, treasureIdx+1)
+
+			treasureName := d.String(treasureColumnKey)
+			if treasureName == "" {
+				continue
+			}
+
+			prob := d.Number(probColumnKey)
+
+			treasure := &Treasure{
+				Name:        treasureName,
+				Probability: prob,
+			}
+
+			if record.Treasures == nil {
+				record.Treasures = []*Treasure{treasure}
+				continue
+			}
+
+			record.Treasures = append(record.Treasures, treasure)
+		}
+
+		TreasureClass[record.Name] = record
+	}
+
+	if d.Err != nil {
+		panic(d.Err)
+	}
+
+	log.Printf("Loaded %d TreasureClass records", len(TreasureClass))
+}

d2common/d2resource/resource_paths.go

@@ -193,6 +193,7 @@ const (
 	CubeRecipes      = "/data/global/excel/cubemain.txt"
 	Skills           = "/data/global/excel/skills.txt"
 	SkillDesc        = "/data/global/excel/skilldesc.txt"
+	TreasureClass    = "/data/global/excel/TreasureClassEx.txt"
 
 	// --- Animations ---