UPDATE: Add ldiff

internal/diff-service/ldifff.go

@@ -0,0 +1,172 @@
+package diffService
+
+import (
+	"firefly-launcher/pkg/firefly"
+	"firefly-launcher/pkg/firefly/pb"
+	"firefly-launcher/pkg/hpatchz"
+	"firefly-launcher/pkg/models"
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+	"sync"
+
+	"github.com/wailsapp/wails/v3/pkg/application"
+)
+
+func (h *DiffService) LDiffPatchData(gamePath string) (bool, string) {
+	entries, err := os.ReadDir(gamePath)
+	if err != nil {
+		return false, err.Error()
+	}
+	ldiffPath := filepath.Join(gamePath, "ldiff")
+
+	for _, entry := range entries {
+		if entry.IsDir() {
+			continue
+		}
+		if !entry.Type().IsRegular() {
+			continue
+		}
+
+		name := entry.Name()
+		if strings.HasPrefix(name, "manifest") {
+			manifestName := entry.Name()
+			manifestPath := filepath.Join(gamePath, manifestName)
+
+			manifest, err := firefly.LoadManifestProto(manifestPath)
+			if err != nil {
+				continue
+			}
+
+			ldiffEntries, err := os.ReadDir(ldiffPath)
+			if err != nil {
+				return false, err.Error()
+			}
+			application.Get().Event.Emit("diff:stage", map[string]string{"stage": "Processing LDiff"})
+			for i, ldiffEntry := range ldiffEntries {
+				assetName := ldiffEntry.Name()
+				var matchingAssets []struct {
+					AssetName string
+					AssetSize int64
+					Asset     *pb.AssetManifest
+				}
+
+				application.Get().Event.Emit(
+					"diff:progress", map[string]int{
+						"progress":    i,
+						"maxProgress": len(ldiffEntries),
+					})
+
+				var wg sync.WaitGroup
+				var mu sync.Mutex
+
+				for _, assetGroup := range manifest.Assets {
+					assetGroup := assetGroup
+					wg.Go(func() {
+						if data := assetGroup.AssetData; data != nil {
+							for _, asset := range data.Assets {
+								if asset.ChunkFileName == assetName {
+									mu.Lock()
+									matchingAssets = append(matchingAssets, struct {
+										AssetName string
+										AssetSize int64
+										Asset     *pb.AssetManifest
+									}{assetGroup.AssetName, assetGroup.AssetSize, asset})
+									mu.Unlock()
+								}
+							}
+						}
+					})
+				}
+
+				wg.Wait()
+
+				for _, ma := range matchingAssets {
+					err := firefly.LDiffFile(ma.Asset, ma.AssetName, ma.AssetSize, ldiffPath, gamePath)
+					if err != nil {
+						continue
+					}
+				}
+			}
+
+			diffMapNames := make([]string, len(ldiffEntries))
+			for i, e := range ldiffEntries {
+				diffMapNames[i] = e.Name()
+			}
+
+			diffMapList, err := MakeDiffMap(manifest, diffMapNames)
+			if err != nil {
+				return false, err.Error()
+			}
+			application.Get().Event.Emit("diff:stage", map[string]string{"stage": "Patching HDiff"})
+			for i, entry := range diffMapList {
+				application.Get().Event.Emit(
+					"diff:progress", map[string]int{
+						"progress":    i,
+						"maxProgress": len(diffMapList),
+					})
+				sourceFile := filepath.Join(gamePath, entry.SourceFileName)
+				patchFile := filepath.Join(gamePath, entry.PatchFileName)
+				targetFile := filepath.Join(gamePath, entry.TargetFileName)
+
+				if _, err := os.Stat(patchFile); os.IsNotExist(err) {
+					continue
+				}
+
+				if entry.SourceFileName == "" {
+					hpatchz.ApplyPatchEmpty(patchFile, targetFile)
+					os.Remove(patchFile)
+					continue
+				}
+
+				if _, err := os.Stat(sourceFile); os.IsNotExist(err) {
+					continue
+				}
+
+				hpatchz.ApplyPatch(sourceFile, patchFile, targetFile)
+				if entry.SourceFileName != entry.TargetFileName {
+					os.Remove(sourceFile)
+				}
+				os.Remove(patchFile)
+			}
+
+		}
+	}
+	os.RemoveAll(ldiffPath)
+	return true, "patching completed"
+}
+
+func MakeDiffMap(manifest *pb.ManifestProto, chunkNames []string) ([]*models.HDiffData, error) {
+	var hdiffFiles []*models.HDiffData
+
+	for _, asset := range manifest.Assets {
+		assetName := asset.AssetName
+		assetSize := asset.AssetSize
+
+		if asset.AssetData != nil {
+			for _, chunk := range asset.AssetData.Assets {
+				matched := false
+				for _, name := range chunkNames {
+					if name == chunk.ChunkFileName {
+						matched = true
+						break
+					}
+				}
+				if !matched {
+					continue
+				}
+
+				if chunk.OriginalFileSize != 0 || chunk.HdiffFileSize != assetSize {
+					hdiffFiles = append(hdiffFiles, &models.HDiffData{
+						SourceFileName: chunk.OriginalFilePath,
+						TargetFileName: assetName,
+						PatchFileName:  fmt.Sprintf("%s.hdiff", assetName),
+					})
+				}
+			}
+		}
+	}
+
+	return hdiffFiles, nil
+}