Add npc.txt loader (#650)

d2app/app.go

@@ -258,6 +258,7 @@ func (a *App) loadDataDict() error {
 		{d2resource.ElemType, d2datadict.LoadElemTypes},
 		{d2resource.PlrMode, d2datadict.LoadPlrModes},
 		{d2resource.PetType, d2datadict.LoadPetTypes},
+		{d2resource.NPC, d2datadict.LoadNPCs},
 	}
 
 	d2datadict.InitObjectRecords()

d2common/d2data/d2datadict/npc.go

@@ -0,0 +1,100 @@
+package d2datadict
+
+import (
+	"log"
+
+	"github.com/OpenDiablo2/OpenDiablo2/d2common"
+)
+
+//NPCRecord represents a single line in NPC.txt
+//The information has been gathered from [https://d2mods.info/forum/kb/viewarticle?a=387]
+type NPCRecord struct {
+	//ID pointer to row of this npc in monstats.txt
+	NPC string
+
+	//Percentage of base item price used when an item is bought by NPC
+	//Actual value in file is fraction of 1024
+	//Notice: BuyMultiplier used when selling an item to an NPC
+	BuyMultiplier float64
+
+	//Percentage of base item price used when an item is sold by NPC
+	//Actual value in file is fraction of 1024
+	//Notice: SellMultiplier used when buying an item from an NPC
+	SellMultiplier float64
+
+	//Percentage of base item price used to calculate the base repair price
+	//Actual value in file is fraction of 1024
+	RepairMultiplier float64
+
+	//The quest flag that must be checked to activate the corresponding QuestBuyMultiplier
+	QuestFlagA int
+
+	//Percentage of change of multiplier when the corresponding quest flag is checked
+	//Example: Quest flag A is checked, so the item price will be: (base price) * BuyMultiplier * QuestBuyMultiplierA
+	//Actual value in file is fraction of 1024
+	QuestBuyMultiplierA float64
+
+	//Percentage of change of multiplier when the corresponding quest flag is checked
+	//Actual value in file is fraction of 1024
+	QuestSellMultiplierA float64
+
+	//Percentage of change of multiplier when the corresponding quest flag is checked
+	//Actual value in file is fraction of 1024
+	QuestRepairMultiplierA float64
+
+	//ditto, three quests maximum
+	QuestFlagB             int
+	QuestBuyMultiplierB    float64
+	QuestSellMultiplierB   float64
+	QuestRepairMultiplierB float64
+
+	QuestFlagC             int
+	QuestBuyMultiplierC    float64
+	QuestSellMultiplierC   float64
+	QuestRepairMultiplierC float64
+
+	//The maximum amount of gold an NPC will pay for an item for the corresponding difficulty
+	MaxBuy          int
+	MaxBuyNightmare int
+	MaxBuyHell      int
+}
+
+//NPCs stores the NPCRecords
+var NPCs map[string]*NPCRecord //nolint:gochecknoglobals // Currently global by design
+
+//LoadNPCs loads NPCRecords into NPCs
+func LoadNPCs(file []byte) {
+	NPCs = make(map[string]*NPCRecord)
+
+	d := d2common.LoadDataDictionary(file)
+	for d.Next() {
+		record := &NPCRecord{
+			NPC:                    d.String("npc"),
+			BuyMultiplier:          float64(d.Number("buy mult")) / 1024.,
+			SellMultiplier:         float64(d.Number("sell mult")) / 1024.,
+			RepairMultiplier:       float64(d.Number("rep mult")) / 1024.,
+			QuestFlagA:             d.Number("questflag A"),
+			QuestBuyMultiplierA:    float64(d.Number("questbuymult A")) / 1024.,
+			QuestSellMultiplierA:   float64(d.Number("questsellmult A")) / 1024.,
+			QuestRepairMultiplierA: float64(d.Number("questrepmult A")) / 1024.,
+			QuestFlagB:             d.Number("questflag B"),
+			QuestBuyMultiplierB:    float64(d.Number("questbuymult B")) / 1024.,
+			QuestSellMultiplierB:   float64(d.Number("questsellmult B")) / 1024.,
+			QuestRepairMultiplierB: float64(d.Number("questrepmult B")) / 1024.,
+			QuestFlagC:             d.Number("questflag C"),
+			QuestBuyMultiplierC:    float64(d.Number("questbuymult C")) / 1024.,
+			QuestSellMultiplierC:   float64(d.Number("questsellmult C")) / 1024.,
+			QuestRepairMultiplierC: float64(d.Number("questrepmult C")) / 1024.,
+			MaxBuy:                 d.Number("max buy"),
+			MaxBuyNightmare:        d.Number("max buy (N)"),
+			MaxBuyHell:             d.Number("max buy (H)"),
+		}
+		NPCs[record.NPC] = record
+	}
+
+	if d.Err != nil {
+		panic(d.Err)
+	}
+
+	log.Printf("Loaded %d NPC records", len(NPCs))
+}

d2common/d2resource/resource_paths.go

@@ -202,6 +202,7 @@ const (
 	ElemType         = "/data/global/excel/ElemTypes.txt"
 	PlrMode          = "/data/global/excel/PlrMode.txt"
 	PetType          = "/data/global/excel/pettype.txt"
+	NPC              = "/data/global/excel/npc.txt"
 
 	// --- Animations ---