repository: move Blob, Blobs and PackedBlob to pack package

This removes them from the public interface. The latter now only
provides the PackBlob interface, without being bound to the type used
internally by the pack package.

internal/repository/checker.go

@@ -129,10 +129,11 @@ func (c *Checker) LoadIndex(ctx context.Context, p restic.TerminalCounterFactory
 			}
 			cnt++
 
-			if _, ok := packToIndex[blob.PackID]; !ok {
-				packToIndex[blob.PackID] = restic.NewIDSet()
+			packID := blob.PackID()
+			if _, ok := packToIndex[packID]; !ok {
+				packToIndex[packID] = restic.NewIDSet()
 			}
-			packToIndex[blob.PackID].Insert(id)
+			packToIndex[packID].Insert(id)
 		}
 
 		for pbs := range idx.EachByPack(ctx, restic.NewIDSet()) {
@@ -259,7 +260,7 @@ func (c *Checker) ReadPacks(ctx context.Context, filter func(packs map[restic.ID
 	type checkTask struct {
 		id    restic.ID
 		size  int64
-		blobs restic.Blobs
+		blobs pack.Blobs
 	}
 	ch := make(chan checkTask)
 
@@ -329,7 +330,7 @@ func (c *Checker) ReadPacks(ctx context.Context, filter func(packs map[restic.ID
 }
 
 // checkPack reads a pack and checks the integrity of all blobs.
-func checkPack(ctx context.Context, r *Repository, id restic.ID, blobs restic.Blobs, size int64, bufRd *bufio.Reader, dec *zstd.Decoder) error {
+func checkPack(ctx context.Context, r *Repository, id restic.ID, blobs pack.Blobs, size int64, bufRd *bufio.Reader, dec *zstd.Decoder) error {
 	err := checkPackInner(ctx, r, id, blobs, size, bufRd, dec)
 	if err != nil {
 		if r.cache != nil {
@@ -348,7 +349,7 @@ func checkPack(ctx context.Context, r *Repository, id restic.ID, blobs restic.Bl
 	return err
 }
 
-func checkPackInner(ctx context.Context, r *Repository, id restic.ID, blobs restic.Blobs, size int64, bufRd *bufio.Reader, dec *zstd.Decoder) error {
+func checkPackInner(ctx context.Context, r *Repository, id restic.ID, blobs pack.Blobs, size int64, bufRd *bufio.Reader, dec *zstd.Decoder) error {
 
 	type partialReadError struct {
 		error
@@ -465,7 +466,7 @@ func checkPackInner(ctx context.Context, r *Repository, id restic.ID, blobs rest
 		// Check if blob is contained in index and position is correct
 		idxHas := false
 		for _, pb := range r.idx.Lookup(blob.BlobHandle) {
-			if pb.PackID.Equal(id) && pb.Blob == blob {
+			if pb.PackID().Equal(id) && pb.Blob == blob {
 				idxHas = true
 				break
 			}

internal/repository/debug.go

@@ -123,7 +123,7 @@ func ExaminePack(ctx context.Context, repo *Repository, id restic.ID, opts Exami
 
 		checkPackSize(b.Blobs, len(buf), printer)
 
-		err = loadBlobs(ctx, opts, repo, id, b.Blobs, printer)
+		err := loadBlobs(ctx, opts, repo, id, b.Blobs, printer)
 		if err != nil {
 			printer.E("error: %v", err)
 		} else {
@@ -146,7 +146,7 @@ func ExaminePack(ctx context.Context, repo *Repository, id restic.ID, opts Exami
 	return nil
 }
 
-func checkPackSize(blobs restic.Blobs, fileSize int, printer progress.Printer) {
+func checkPackSize(blobs pack.Blobs, fileSize int, printer progress.Printer) {
 	// track current size and offset
 	var size, offset uint64
 
@@ -284,7 +284,7 @@ func decryptUnsigned(k *crypto.Key, buf []byte) []byte {
 	return out
 }
 
-func loadBlobs(ctx context.Context, opts ExaminePackOptions, repo *Repository, packID restic.ID, list restic.Blobs, printer progress.Printer) error {
+func loadBlobs(ctx context.Context, opts ExaminePackOptions, repo *Repository, packID restic.ID, list pack.Blobs, printer progress.Printer) error {
 	dec, err := zstd.NewReader(nil)
 	if err != nil {
 		panic(err)

internal/repository/index/associated_data.go

@@ -159,14 +159,15 @@ func (a *AssociatedSet[T]) All() iter.Seq2[restic.BlobHandle, T] {
 		}
 
 		for pb := range a.idx.Values() {
-			if _, ok := a.overflow[pb.BlobHandle]; ok {
+			bh := pb.Handle()
+			if _, ok := a.overflow[bh]; ok {
 				// already reported via overflow set
 				continue
 			}
 
-			val, known := a.Get(pb.BlobHandle)
+			val, known := a.Get(bh)
 			if known {
-				if !yield(pb.BlobHandle, val) {
+				if !yield(bh, val) {
 					return
 				}
 			}

internal/repository/index/associated_data_test.go

@@ -6,6 +6,7 @@ import (
 	"testing"
 
 	"github.com/restic/restic/internal/crypto"
+	"github.com/restic/restic/internal/repository/pack"
 	"github.com/restic/restic/internal/restic"
 	"github.com/restic/restic/internal/test"
 )
@@ -19,17 +20,17 @@ func (n *noopSaver) SaveUnpacked(_ context.Context, _ restic.FileType, buf []byt
 	return restic.Hash(buf), nil
 }
 
-func makeFakePackedBlob() (restic.BlobHandle, restic.PackedBlob) {
+func makeFakePackedBlob() (restic.BlobHandle, *pack.PackedBlob) {
 	bh := restic.NewRandomBlobHandle()
-	blob := restic.PackedBlob{
-		PackID: restic.NewRandomID(),
-		Blob: restic.Blob{
+	pb := &pack.PackedBlob{
+		Pack: restic.NewRandomID(),
+		Blob: pack.Blob{
 			BlobHandle: bh,
 			Length:     uint(crypto.CiphertextLength(10)),
 			Offset:     0,
 		},
 	}
-	return bh, blob
+	return bh, pb
 }
 
 func list(bs *AssociatedSet[uint8]) restic.BlobHandles {
@@ -40,7 +41,7 @@ func TestAssociatedSet(t *testing.T) {
 	bh, blob := makeFakePackedBlob()
 
 	mi := NewMasterIndex()
-	test.OK(t, mi.StorePack(context.TODO(), blob.PackID, restic.Blobs{blob.Blob}, &noopSaver{}))
+	test.OK(t, mi.StorePack(context.TODO(), blob.PackID(), pack.Blobs{blob.Blob}, &noopSaver{}))
 	test.OK(t, mi.Flush(context.TODO(), &noopSaver{}))
 
 	bs := NewAssociatedSet[uint8](mi)
@@ -123,14 +124,14 @@ func TestAssociatedSetWithExtendedIndex(t *testing.T) {
 	_, blob := makeFakePackedBlob()
 
 	mi := NewMasterIndex()
-	test.OK(t, mi.StorePack(context.TODO(), blob.PackID, restic.Blobs{blob.Blob}, &noopSaver{}))
+	test.OK(t, mi.StorePack(context.TODO(), blob.PackID(), pack.Blobs{blob.Blob}, &noopSaver{}))
 	test.OK(t, mi.Flush(context.TODO(), &noopSaver{}))
 
 	bs := NewAssociatedSet[uint8](mi)
 
 	// add new blobs to index after building the set
 	of, blob2 := makeFakePackedBlob()
-	test.OK(t, mi.StorePack(context.TODO(), blob2.PackID, restic.Blobs{blob2.Blob}, &noopSaver{}))
+	test.OK(t, mi.StorePack(context.TODO(), blob2.PackID(), pack.Blobs{blob2.Blob}, &noopSaver{}))
 	test.OK(t, mi.Flush(context.TODO(), &noopSaver{}))
 
 	// non-existent
@@ -167,10 +168,10 @@ func TestAssociatedSetIntersectAndSub(t *testing.T) {
 	bh3, blob3 := makeFakePackedBlob()
 	bh4, blob4 := makeFakePackedBlob()
 
-	test.OK(t, mi.StorePack(context.TODO(), blob1.PackID, restic.Blobs{blob1.Blob}, saver))
-	test.OK(t, mi.StorePack(context.TODO(), blob2.PackID, restic.Blobs{blob2.Blob}, saver))
-	test.OK(t, mi.StorePack(context.TODO(), blob3.PackID, restic.Blobs{blob3.Blob}, saver))
-	test.OK(t, mi.StorePack(context.TODO(), blob4.PackID, restic.Blobs{blob4.Blob}, saver))
+	test.OK(t, mi.StorePack(context.TODO(), blob1.PackID(), pack.Blobs{blob1.Blob}, saver))
+	test.OK(t, mi.StorePack(context.TODO(), blob2.PackID(), pack.Blobs{blob2.Blob}, saver))
+	test.OK(t, mi.StorePack(context.TODO(), blob3.PackID(), pack.Blobs{blob3.Blob}, saver))
+	test.OK(t, mi.StorePack(context.TODO(), blob4.PackID(), pack.Blobs{blob4.Blob}, saver))
 	test.OK(t, mi.Flush(context.TODO(), saver))
 
 	t.Run("Intersect", func(t *testing.T) {

internal/repository/index/index.go

@@ -73,7 +73,7 @@ func (idx *Index) addToPacks(id restic.ID) int {
 	return len(idx.packs) - 1
 }
 
-func (idx *Index) store(packIndex int, blob restic.Blob) {
+func (idx *Index) store(packIndex int, blob pack.Blob) {
 	// assert that offset and length fit into uint32!
 	if blob.Offset > math.MaxUint32 || blob.Length > math.MaxUint32 || blob.UncompressedLength > math.MaxUint32 {
 		panic("offset or length does not fit in uint32. You have packs > 4GB!")
@@ -146,7 +146,7 @@ func (idx *Index) Preallocate(t restic.BlobType, numEntries int) {
 
 // StorePack remembers the ids of all blobs of a given pack
 // in the index
-func (idx *Index) StorePack(id restic.ID, blobs restic.Blobs) {
+func (idx *Index) StorePack(id restic.ID, blobs pack.Blobs) {
 	idx.m.Lock()
 	defer idx.m.Unlock()
 
@@ -162,23 +162,24 @@ func (idx *Index) StorePack(id restic.ID, blobs restic.Blobs) {
 	}
 }
 
-func (idx *Index) toPackedBlob(e *indexEntry, t restic.BlobType) restic.PackedBlob {
-	return restic.PackedBlob{
-		Blob: restic.Blob{
+func (idx *Index) toPackedBlob(e *indexEntry, t restic.BlobType) *pack.PackedBlob {
+	return &pack.PackedBlob{
+		Pack: idx.packs[e.packIndex],
+		Blob: pack.Blob{
 			BlobHandle: restic.BlobHandle{
 				ID:   e.id,
-				Type: t},
+				Type: t,
+			},
 			Length:             uint(e.length),
 			Offset:             uint(e.offset),
 			UncompressedLength: uint(e.uncompressedLength),
 		},
-		PackID: idx.packs[e.packIndex],
 	}
 }
 
 // Lookup queries the index for the blob ID and returns all entries including
-// duplicates. Adds found entries to blobs and returns the result.
-func (idx *Index) Lookup(bh restic.BlobHandle, pbs []restic.PackedBlob) []restic.PackedBlob {
+// duplicates. Adds found entries to pbs and returns the result.
+func (idx *Index) Lookup(bh restic.BlobHandle, pbs []*pack.PackedBlob) []*pack.PackedBlob {
 	idx.m.RLock()
 	defer idx.m.RUnlock()
 
@@ -215,8 +216,8 @@ func (idx *Index) LookupSize(bh restic.BlobHandle) (plaintextLength uint, found
 
 // Values returns an iterator over all blobs known to the index. This blocks any
 // modification of the index.
-func (idx *Index) Values() iter.Seq[restic.PackedBlob] {
-	return func(yield func(restic.PackedBlob) bool) {
+func (idx *Index) Values() iter.Seq[*pack.PackedBlob] {
+	return func(yield func(*pack.PackedBlob) bool) {
 		idx.m.RLock()
 		defer idx.m.RUnlock()
 
@@ -231,17 +232,23 @@ func (idx *Index) Values() iter.Seq[restic.PackedBlob] {
 	}
 }
 
-// EachByPack returns a channel that yields all blobs known to the index
+// PackBlobs lists all blobs contained in a pack file according to the index.
+type PackBlobs struct {
+	PackID restic.ID
+	Blobs  pack.Blobs
+}
+
+// EachByPack returns a channel that yields all blobs known to the index,
 // grouped by packID but ignoring blobs with a packID in packPlacklist for
 // finalized indexes.
 // This filtering is used when rebuilding the index where we need to ignore packs
 // from the finalized index which have been re-read into a non-finalized index.
 // When the  context is cancelled, the background goroutine
 // terminates. This blocks any modification of the index.
-func (idx *Index) EachByPack(ctx context.Context, packBlacklist restic.IDSet) <-chan restic.PackBlobs {
+func (idx *Index) EachByPack(ctx context.Context, packBlacklist restic.IDSet) <-chan PackBlobs {
 	idx.m.RLock()
 
-	ch := make(chan restic.PackBlobs)
+	ch := make(chan PackBlobs)
 
 	go func() {
 		defer idx.m.RUnlock()
@@ -262,7 +269,7 @@ func (idx *Index) EachByPack(ctx context.Context, packBlacklist restic.IDSet) <-
 		}
 
 		for packID, packByType := range byPack {
-			var result restic.PackBlobs
+			var result PackBlobs
 			result.PackID = packID
 			for typ, p := range packByType {
 				for _, e := range p {
@@ -482,7 +489,7 @@ func (idx *Index) merge(idx2 *Index) error {
 			for e := range m.valuesWithID(e2.id) {
 				b := idx.toPackedBlob(e, restic.BlobType(typ))
 				b2 := idx2.toPackedBlob(e2, restic.BlobType(typ))
-				if b == b2 {
+				if b.Blob == b2.Blob && b.PackID() == b2.PackID() {
 					found = true
 					break
 				}
@@ -519,7 +526,7 @@ func DecodeIndex(buf []byte, id restic.ID) (idx *Index, err error) {
 		packID := idx.addToPacks(p.ID)
 
 		for _, blob := range p.Blobs {
-			idx.store(packID, restic.Blob{
+			idx.store(packID, pack.Blob{
 				BlobHandle: restic.BlobHandle{
 					Type: blob.Type,
 					ID:   blob.ID},
@@ -550,7 +557,7 @@ func (idx *Index) Len(t restic.BlobType) uint {
 	return idx.byType[t].len()
 }
 
-func PackBlobsHash(pbs restic.PackBlobs) restic.ID {
+func PackBlobsHash(pbs PackBlobs) restic.ID {
 	h := sha256.New()
 	h.Write(pbs.PackID[:])
 

internal/repository/index/index_internal_test.go

@@ -14,7 +14,7 @@ func TestIndexOversized(t *testing.T) {
 	// Add blobs up to indexMaxBlobs + pack.MaxHeaderEntries - 1
 	packID := idx.addToPacks(restic.NewRandomID())
 	for i := uint(0); i < indexMaxBlobs+pack.MaxHeaderEntries-1; i++ {
-		idx.store(packID, restic.Blob{
+		idx.store(packID, pack.Blob{
 			BlobHandle: restic.BlobHandle{
 				Type: restic.DataBlob,
 				ID:   restic.NewRandomID(),
@@ -27,7 +27,7 @@ func TestIndexOversized(t *testing.T) {
 	rtest.Assert(t, !Oversized(idx), "index should not be considered oversized")
 
 	// Add one more blob to exceed the limit
-	idx.store(packID, restic.Blob{
+	idx.store(packID, pack.Blob{
 		BlobHandle: restic.BlobHandle{
 			Type: restic.DataBlob,
 			ID:   restic.NewRandomID(),

internal/repository/index/index_test.go

@@ -9,19 +9,20 @@ import (
 	"testing"
 
 	"github.com/restic/restic/internal/repository/index"
+	"github.com/restic/restic/internal/repository/pack"
 	"github.com/restic/restic/internal/restic"
 	rtest "github.com/restic/restic/internal/test"
 )
 
 func TestIndexSerialize(t *testing.T) {
-	tests := []restic.PackedBlob{}
+	tests := []*pack.PackedBlob{}
 
 	idx := index.NewIndex()
 
 	// create 50 packs with 20 blobs each
 	for i := 0; i < 50; i++ {
 		packID := restic.NewRandomID()
-		var blobs restic.Blobs
+		var blobs pack.Blobs
 
 		pos := uint(0)
 		for j := 0; j < 20; j++ {
@@ -31,14 +32,14 @@ func TestIndexSerialize(t *testing.T) {
 				// test a mix of compressed and uncompressed packs
 				uncompressedLength = 2 * length
 			}
-			pb := restic.PackedBlob{
-				Blob: restic.Blob{
+			pb := &pack.PackedBlob{
+				Pack: packID,
+				Blob: pack.Blob{
 					BlobHandle:         restic.NewRandomBlobHandle(),
 					Offset:             pos,
 					Length:             length,
 					UncompressedLength: uncompressedLength,
 				},
-				PackID: packID,
 			}
 			blobs = append(blobs, pb.Blob)
 			tests = append(tests, pb)
@@ -64,17 +65,17 @@ func TestIndexSerialize(t *testing.T) {
 	rtest.OK(t, err)
 
 	for _, testBlob := range tests {
-		list := idx.Lookup(testBlob.BlobHandle, nil)
+		list := idx.Lookup(testBlob.Handle(), nil)
 		if len(list) != 1 {
-			t.Errorf("expected one result for blob %v, got %v: %v", testBlob.ID.Str(), len(list), list)
+			t.Errorf("expected one result for blob %v, got %v: %v", testBlob.Handle().ID.String(), len(list), list)
 		}
 		result := list[0]
 
 		rtest.Equals(t, testBlob, result)
 
-		list2 := idx2.Lookup(testBlob.BlobHandle, nil)
+		list2 := idx2.Lookup(testBlob.Handle(), nil)
 		if len(list2) != 1 {
-			t.Errorf("expected one result for blob %v, got %v: %v", testBlob.ID.Str(), len(list2), list2)
+			t.Errorf("expected one result for blob %v, got %v: %v", testBlob.Handle().ID.String(), len(list2), list2)
 		}
 		result2 := list2[0]
 
@@ -82,21 +83,21 @@ func TestIndexSerialize(t *testing.T) {
 	}
 
 	// add more blobs to idx
-	newtests := []restic.PackedBlob{}
+	newtests := []*pack.PackedBlob{}
 	for i := 0; i < 10; i++ {
 		packID := restic.NewRandomID()
-		var blobs restic.Blobs
+		var blobs pack.Blobs
 
 		pos := uint(0)
 		for j := 0; j < 10; j++ {
 			length := uint(i*100 + j)
-			pb := restic.PackedBlob{
-				Blob: restic.Blob{
+			pb := &pack.PackedBlob{
+				Pack: packID,
+				Blob: pack.Blob{
 					BlobHandle: restic.NewRandomBlobHandle(),
 					Offset:     pos,
 					Length:     length,
 				},
-				PackID: packID,
 			}
 			blobs = append(blobs, pb.Blob)
 			newtests = append(newtests, pb)
@@ -127,9 +128,9 @@ func TestIndexSerialize(t *testing.T) {
 
 	// all new blobs must be in the index
 	for _, testBlob := range newtests {
-		list := idx3.Lookup(testBlob.BlobHandle, nil)
+		list := idx3.Lookup(testBlob.Handle(), nil)
 		if len(list) != 1 {
-			t.Errorf("expected one result for blob %v, got %v: %v", testBlob.ID.Str(), len(list), list)
+			t.Errorf("expected one result for blob %v, got %v: %v", testBlob.Handle().ID.String(), len(list), list)
 		}
 
 		blob := list[0]
@@ -145,12 +146,12 @@ func TestIndexSize(t *testing.T) {
 	blobCount := 100
 	for i := 0; i < packs; i++ {
 		packID := restic.NewRandomID()
-		var blobs restic.Blobs
+		var blobs pack.Blobs
 
 		pos := uint(0)
 		for j := 0; j < blobCount; j++ {
 			length := uint(i*100 + j)
-			blobs = append(blobs, restic.Blob{
+			blobs = append(blobs, pack.Blob{
 				BlobHandle: restic.NewRandomBlobHandle(),
 				Offset:     pos,
 				Length:     length,
@@ -293,15 +294,15 @@ func TestIndexUnserialize(t *testing.T) {
 
 			t.Logf("looking for blob %v/%v, got %v", test.tpe, test.id.Str(), blob)
 
-			rtest.Equals(t, test.packID, blob.PackID)
-			rtest.Equals(t, test.tpe, blob.Type)
-			rtest.Equals(t, test.offset, blob.Offset)
-			rtest.Equals(t, test.length, blob.Length)
+			rtest.Equals(t, test.packID, blob.PackID())
+			rtest.Equals(t, test.tpe, blob.Blob.Type)
+			rtest.Equals(t, test.offset, blob.Blob.Offset)
+			rtest.Equals(t, test.length, blob.Blob.Length)
 			switch task.version {
 			case 1:
-				rtest.Equals(t, uint(0), blob.UncompressedLength)
+				rtest.Equals(t, uint(0), blob.Blob.UncompressedLength)
 			case 2:
-				rtest.Equals(t, test.uncompressedLength, blob.UncompressedLength)
+				rtest.Equals(t, test.uncompressedLength, blob.Blob.UncompressedLength)
 			default:
 				t.Fatal("Invalid index version")
 			}
@@ -313,20 +314,20 @@ func TestIndexUnserialize(t *testing.T) {
 		}
 
 		for _, blob := range blobs {
-			b, ok := exampleLookupTest.blobs[blob.ID]
+			b, ok := exampleLookupTest.blobs[blob.Handle().ID]
 			if !ok {
-				t.Errorf("unexpected blob %v found", blob.ID.Str())
+				t.Errorf("unexpected blob %v found", blob.Handle().ID.String())
 			}
-			if blob.Type != b {
-				t.Errorf("unexpected type for blob %v: want %v, got %v", blob.ID.Str(), b, blob.Type)
+			if blob.Blob.Type != b {
+				t.Errorf("unexpected type for blob %v: want %v, got %v", blob.Handle().ID.String(), b, blob.Blob.Type)
 			}
 		}
 	}
 }
 
-func listPack(t testing.TB, idx *index.Index, id restic.ID) (pbs []restic.PackedBlob) {
+func listPack(t testing.TB, idx *index.Index, id restic.ID) (pbs []*pack.PackedBlob) {
 	for pb := range idx.Values() {
-		if pb.PackID.Equal(id) {
+		if pb.PackID().Equal(id) {
 			pbs = append(pbs, pb)
 		}
 	}
@@ -401,7 +402,7 @@ func TestIndexPacks(t *testing.T) {
 
 	for i := 0; i < 20; i++ {
 		packID := restic.NewRandomID()
-		idx.StorePack(packID, restic.Blobs{
+		idx.StorePack(packID, pack.Blobs{
 			{
 				BlobHandle: restic.NewRandomBlobHandle(),
 				Offset:     0,
@@ -433,12 +434,12 @@ func createRandomIndex(rng *rand.Rand, packfiles int) (idx *index.Index, lookupB
 	// create index with given number of pack files
 	for i := 0; i < packfiles; i++ {
 		packID := NewRandomTestID(rng)
-		var blobs restic.Blobs
+		var blobs pack.Blobs
 		offset := 0
 		for offset < maxPackSize {
 			size := 2000 + rng.Intn(4*1024*1024)
 			id := NewRandomTestID(rng)
-			blobs = append(blobs, restic.Blob{
+			blobs = append(blobs, pack.Blob{
 				BlobHandle: restic.BlobHandle{
 					Type: restic.DataBlob,
 					ID:   id,
@@ -482,7 +483,7 @@ func BenchmarkIndexHasKnown(b *testing.B) {
 	idx, _ := createRandomIndex(rand.New(rand.NewSource(0)), 200000)
 	handles := make([]restic.BlobHandle, 0, 100000)
 	for handle := range idx.Values() {
-		handles = append(handles, handle.BlobHandle)
+		handles = append(handles, handle.Handle())
 		if len(handles) == cap(handles) {
 			break
 		}
@@ -517,14 +518,14 @@ func BenchmarkIndexAllocParallel(b *testing.B) {
 }
 
 func TestIndexHas(t *testing.T) {
-	tests := []restic.PackedBlob{}
+	tests := []*pack.PackedBlob{}
 
 	idx := index.NewIndex()
 
 	// create 50 packs with 20 blobs each
 	for i := 0; i < 50; i++ {
 		packID := restic.NewRandomID()
-		var blobs restic.Blobs
+		var blobs pack.Blobs
 
 		pos := uint(0)
 		for j := 0; j < 20; j++ {
@@ -534,14 +535,14 @@ func TestIndexHas(t *testing.T) {
 				// test a mix of compressed and uncompressed packs
 				uncompressedLength = 2 * length
 			}
-			pb := restic.PackedBlob{
-				Blob: restic.Blob{
+			pb := &pack.PackedBlob{
+				Pack: packID,
+				Blob: pack.Blob{
 					BlobHandle:         restic.NewRandomBlobHandle(),
 					Offset:             pos,
 					Length:             length,
 					UncompressedLength: uncompressedLength,
 				},
-				PackID: packID,
 			}
 			blobs = append(blobs, pb.Blob)
 			tests = append(tests, pb)
@@ -551,11 +552,11 @@ func TestIndexHas(t *testing.T) {
 	}
 
 	for _, testBlob := range tests {
-		rtest.Assert(t, idx.Has(testBlob.BlobHandle), "Index reports not having data blob added to it")
+		rtest.Assert(t, idx.Has(testBlob.Handle()), "Index reports not having data blob added to it")
 	}
 
 	rtest.Assert(t, !idx.Has(restic.NewRandomBlobHandle()), "Index reports having a data blob not added to it")
-	rtest.Assert(t, !idx.Has(restic.BlobHandle{ID: tests[0].ID, Type: restic.TreeBlob}), "Index reports having a tree blob added to it with the same id as a data blob")
+	rtest.Assert(t, !idx.Has(restic.BlobHandle{ID: tests[0].Handle().ID, Type: restic.TreeBlob}), "Index reports having a tree blob added to it with the same id as a data blob")
 }
 
 func TestMixedEachByPack(t *testing.T) {
@@ -566,7 +567,7 @@ func TestMixedEachByPack(t *testing.T) {
 	for i := 0; i < 50; i++ {
 		packID := restic.NewRandomID()
 		expected[packID] = 1
-		blobs := restic.Blobs{
+		blobs := pack.Blobs{
 			{
 				BlobHandle: restic.BlobHandle{Type: restic.DataBlob, ID: restic.NewRandomID()},
 				Offset:     0,
@@ -608,7 +609,7 @@ func TestEachByPackIgnoes(t *testing.T) {
 		} else {
 			expected[packID] = 1
 		}
-		blobs := restic.Blobs{
+		blobs := pack.Blobs{
 			{
 				BlobHandle: restic.BlobHandle{Type: restic.DataBlob, ID: restic.NewRandomID()},
 				Offset:     0,

internal/repository/index/master_index.go

@@ -8,6 +8,7 @@ import (
 	"sync"
 
 	"github.com/restic/restic/internal/debug"
+	"github.com/restic/restic/internal/repository/pack"
 	"github.com/restic/restic/internal/restic"
 	"github.com/restic/restic/internal/ui/progress"
 	"golang.org/x/sync/errgroup"
@@ -39,10 +40,11 @@ func (mi *MasterIndex) clearPendingBlobs() {
 }
 
 // Lookup queries all known Indexes for the ID and returns all matches.
-func (mi *MasterIndex) Lookup(bh restic.BlobHandle) (pbs []restic.PackedBlob) {
+func (mi *MasterIndex) Lookup(bh restic.BlobHandle) []*pack.PackedBlob {
 	mi.idxMutex.RLock()
 	defer mi.idxMutex.RUnlock()
 
+	var pbs []*pack.PackedBlob
 	for _, idx := range mi.idx {
 		pbs = idx.Lookup(bh, pbs)
 	}
@@ -145,12 +147,12 @@ func (mi *MasterIndex) Insert(idx *Index) {
 }
 
 // StorePack remembers the id and pack in the index.
-func (mi *MasterIndex) StorePack(ctx context.Context, id restic.ID, blobs restic.Blobs, r restic.SaverUnpacked[restic.FileType]) error {
+func (mi *MasterIndex) StorePack(ctx context.Context, id restic.ID, blobs pack.Blobs, r restic.SaverUnpacked[restic.FileType]) error {
 	mi.storePack(id, blobs)
 	return mi.saveFullIndex(ctx, r)
 }
 
-func (mi *MasterIndex) storePack(id restic.ID, blobs restic.Blobs) {
+func (mi *MasterIndex) storePack(id restic.ID, blobs pack.Blobs) {
 	mi.idxMutex.Lock()
 	defer mi.idxMutex.Unlock()
 
@@ -218,8 +220,8 @@ func (mi *MasterIndex) finalizeFullIndexes() []*Index {
 
 // Values returns an iterator over all blobs known to the index. This blocks any
 // modification of the index.
-func (mi *MasterIndex) Values() iter.Seq[restic.PackedBlob] {
-	return func(yield func(restic.PackedBlob) bool) {
+func (mi *MasterIndex) Values() iter.Seq[*pack.PackedBlob] {
+	return func(yield func(*pack.PackedBlob) bool) {
 		mi.idxMutex.RLock()
 		defer mi.idxMutex.RUnlock()
 
@@ -663,13 +665,13 @@ func (mi *MasterIndex) saveFullIndex(ctx context.Context, r restic.SaverUnpacked
 }
 
 // ListPacks returns the blobs of the specified pack files grouped by pack file.
-func (mi *MasterIndex) ListPacks(ctx context.Context, packs restic.IDSet) <-chan restic.PackBlobs {
-	out := make(chan restic.PackBlobs)
+func (mi *MasterIndex) ListPacks(ctx context.Context, packs restic.IDSet) <-chan PackBlobs {
+	out := make(chan PackBlobs)
 	go func() {
 		defer close(out)
 		// only resort a part of the index to keep the memory overhead bounded
 		for i := byte(0); i < 16; i++ {
-			packBlob := make(map[restic.ID]restic.Blobs)
+			packBlob := make(map[restic.ID]pack.Blobs)
 			for pack := range packs {
 				if pack[0]&0xf == i {
 					packBlob[pack] = nil
@@ -682,8 +684,9 @@ func (mi *MasterIndex) ListPacks(ctx context.Context, packs restic.IDSet) <-chan
 				if ctx.Err() != nil {
 					return
 				}
-				if packs.Has(pb.PackID) && pb.PackID[0]&0xf == i {
-					packBlob[pb.PackID] = append(packBlob[pb.PackID], pb.Blob)
+				if packs.Has(pb.PackID()) && pb.PackID()[0]&0xf == i {
+					id := pb.PackID()
+					packBlob[id] = append(packBlob[id], pb.Blob)
 				}
 			}
 
@@ -692,7 +695,7 @@ func (mi *MasterIndex) ListPacks(ctx context.Context, packs restic.IDSet) <-chan
 				// allow GC
 				packBlob[packID] = nil
 				select {
-				case out <- restic.PackBlobs{PackID: packID, Blobs: pbs}:
+				case out <- PackBlobs{PackID: packID, Blobs: pbs}:
 				case <-ctx.Done():
 					return
 				}

internal/repository/index/master_index_test.go

@@ -14,6 +14,7 @@ import (
 	"github.com/restic/restic/internal/data"
 	"github.com/restic/restic/internal/repository"
 	"github.com/restic/restic/internal/repository/index"
+	"github.com/restic/restic/internal/repository/pack"
 	"github.com/restic/restic/internal/restic"
 	rtest "github.com/restic/restic/internal/test"
 	"github.com/restic/restic/internal/ui/progress"
@@ -24,18 +25,18 @@ func TestMasterIndex(t *testing.T) {
 	bhInIdx2 := restic.NewRandomBlobHandle()
 	bhInIdx12 := restic.BlobHandle{ID: restic.NewRandomID(), Type: restic.TreeBlob}
 
-	blob1 := restic.PackedBlob{
-		PackID: restic.NewRandomID(),
-		Blob: restic.Blob{
+	blob1 := &pack.PackedBlob{
+		Pack: restic.NewRandomID(),
+		Blob: pack.Blob{
 			BlobHandle: bhInIdx1,
 			Length:     uint(crypto.CiphertextLength(10)),
 			Offset:     0,
 		},
 	}
 
-	blob2 := restic.PackedBlob{
-		PackID: restic.NewRandomID(),
-		Blob: restic.Blob{
+	blob2 := &pack.PackedBlob{
+		Pack: restic.NewRandomID(),
+		Blob: pack.Blob{
 			BlobHandle:         bhInIdx2,
 			Length:             uint(crypto.CiphertextLength(100)),
 			Offset:             10,
@@ -43,9 +44,9 @@ func TestMasterIndex(t *testing.T) {
 		},
 	}
 
-	blob12a := restic.PackedBlob{
-		PackID: restic.NewRandomID(),
-		Blob: restic.Blob{
+	blob12a := &pack.PackedBlob{
+		Pack: restic.NewRandomID(),
+		Blob: pack.Blob{
 			BlobHandle:         bhInIdx12,
 			Length:             uint(crypto.CiphertextLength(123)),
 			Offset:             110,
@@ -53,9 +54,9 @@ func TestMasterIndex(t *testing.T) {
 		},
 	}
 
-	blob12b := restic.PackedBlob{
-		PackID: restic.NewRandomID(),
-		Blob: restic.Blob{
+	blob12b := &pack.PackedBlob{
+		Pack: restic.NewRandomID(),
+		Blob: pack.Blob{
 			BlobHandle:         bhInIdx12,
 			Length:             uint(crypto.CiphertextLength(123)),
 			Offset:             50,
@@ -64,12 +65,12 @@ func TestMasterIndex(t *testing.T) {
 	}
 
 	idx1 := index.NewIndex()
-	idx1.StorePack(blob1.PackID, restic.Blobs{blob1.Blob})
-	idx1.StorePack(blob12a.PackID, restic.Blobs{blob12a.Blob})
+	idx1.StorePack(blob1.PackID(), pack.Blobs{blob1.Blob})
+	idx1.StorePack(blob12a.PackID(), pack.Blobs{blob12a.Blob})
 
 	idx2 := index.NewIndex()
-	idx2.StorePack(blob2.PackID, restic.Blobs{blob2.Blob})
-	idx2.StorePack(blob12b.PackID, restic.Blobs{blob12b.Blob})
+	idx2.StorePack(blob2.PackID(), pack.Blobs{blob2.Blob})
+	idx2.StorePack(blob12b.PackID(), pack.Blobs{blob12b.Blob})
 
 	mIdx := index.NewMasterIndex()
 	mIdx.Insert(idx1)
@@ -77,7 +78,7 @@ func TestMasterIndex(t *testing.T) {
 
 	// test idInIdx1
 	blobs := mIdx.Lookup(bhInIdx1)
-	rtest.Equals(t, []restic.PackedBlob{blob1}, blobs)
+	rtest.Equals(t, []*pack.PackedBlob{blob1}, blobs)
 
 	size, found := mIdx.LookupSize(bhInIdx1)
 	rtest.Equals(t, true, found)
@@ -85,7 +86,7 @@ func TestMasterIndex(t *testing.T) {
 
 	// test idInIdx2
 	blobs = mIdx.Lookup(bhInIdx2)
-	rtest.Equals(t, []restic.PackedBlob{blob2}, blobs)
+	rtest.Equals(t, []*pack.PackedBlob{blob2}, blobs)
 
 	size, found = mIdx.LookupSize(bhInIdx2)
 	rtest.Equals(t, true, found)
@@ -95,19 +96,20 @@ func TestMasterIndex(t *testing.T) {
 	blobs = mIdx.Lookup(bhInIdx12)
 	rtest.Equals(t, 2, len(blobs))
 
-	// test Lookup result for blob12a
-	found = false
-	if blobs[0] == blob12a || blobs[1] == blob12a {
-		found = true
+	containsPackedBlob := func(list []*pack.PackedBlob, want *pack.PackedBlob) bool {
+		for _, b := range list {
+			if b.PackID().Equal(want.PackID()) && b.Blob == want.Blob {
+				return true
+			}
+		}
+		return false
 	}
-	rtest.Assert(t, found, "blob12a not found in result")
+
+	// test Lookup result for blob12a
+	rtest.Assert(t, containsPackedBlob(blobs, blob12a), "blob12a not found in result")
 
 	// test Lookup result for blob12b
-	found = false
-	if blobs[0] == blob12b || blobs[1] == blob12b {
-		found = true
-	}
-	rtest.Assert(t, found, "blob12a not found in result")
+	rtest.Assert(t, containsPackedBlob(blobs, blob12b), "blob12b not found in result")
 
 	size, found = mIdx.LookupSize(bhInIdx12)
 	rtest.Equals(t, true, found)
@@ -135,7 +137,7 @@ func TestMasterIndexAddPending(t *testing.T) {
 	// Test AddPending: try to add a blob that's already in an index (should return false)
 	bhInIndex := restic.NewRandomBlobHandle()
 	idx := index.NewIndex()
-	idx.StorePack(restic.NewRandomID(), restic.Blobs{{
+	idx.StorePack(restic.NewRandomID(), pack.Blobs{{
 		BlobHandle:         bhInIndex,
 		Length:             uint(crypto.CiphertextLength(50)),
 		Offset:             0,
@@ -173,14 +175,14 @@ func TestMasterIndexStorePackRemovesPending(t *testing.T) {
 
 	// Store the blob in a pack
 	packID := restic.NewRandomID()
-	blob := restic.Blob{
+	blob := pack.Blob{
 		BlobHandle:         bhPending,
 		Length:             uint(crypto.CiphertextLength(75)),
 		Offset:             0,
 		UncompressedLength: 75,
 	}
 	saver := &noopSaver{}
-	err := mIdx.StorePack(context.Background(), packID, restic.Blobs{blob}, saver)
+	err := mIdx.StorePack(context.Background(), packID, pack.Blobs{blob}, saver)
 	rtest.OK(t, err)
 
 	// Verify it is still found
@@ -191,8 +193,8 @@ func TestMasterIndexStorePackRemovesPending(t *testing.T) {
 	// Verify the blob can be found via Lookup from the index
 	blobs := mIdx.Lookup(bhPending)
 	rtest.Assert(t, len(blobs) > 0, "blob should be found in index after StorePack")
-	rtest.Equals(t, packID, blobs[0].PackID)
-	rtest.Equals(t, bhPending, blobs[0].BlobHandle)
+	rtest.Equals(t, packID, blobs[0].PackID())
+	rtest.Equals(t, bhPending, blobs[0].Handle())
 
 	// Test that adding the same blob as pending again fails (it's now in index)
 	added = mIdx.AddPending(bhPending, 100)
@@ -203,18 +205,18 @@ func TestMasterMergeFinalIndexes(t *testing.T) {
 	bhInIdx1 := restic.NewRandomBlobHandle()
 	bhInIdx2 := restic.NewRandomBlobHandle()
 
-	blob1 := restic.PackedBlob{
-		PackID: restic.NewRandomID(),
-		Blob: restic.Blob{
+	blob1 := &pack.PackedBlob{
+		Pack: restic.NewRandomID(),
+		Blob: pack.Blob{
 			BlobHandle: bhInIdx1,
 			Length:     10,
 			Offset:     0,
 		},
 	}
 
-	blob2 := restic.PackedBlob{
-		PackID: restic.NewRandomID(),
-		Blob: restic.Blob{
+	blob2 := &pack.PackedBlob{
+		Pack: restic.NewRandomID(),
+		Blob: pack.Blob{
 			BlobHandle:         bhInIdx2,
 			Length:             100,
 			Offset:             10,
@@ -223,10 +225,10 @@ func TestMasterMergeFinalIndexes(t *testing.T) {
 	}
 
 	idx1 := index.NewIndex()
-	idx1.StorePack(blob1.PackID, restic.Blobs{blob1.Blob})
+	idx1.StorePack(blob1.PackID(), pack.Blobs{blob1.Blob})
 
 	idx2 := index.NewIndex()
-	idx2.StorePack(blob2.PackID, restic.Blobs{blob2.Blob})
+	idx2.StorePack(blob2.PackID(), pack.Blobs{blob2.Blob})
 
 	mIdx := index.NewMasterIndex()
 	mIdx.Insert(idx1)
@@ -246,18 +248,18 @@ func TestMasterMergeFinalIndexes(t *testing.T) {
 	rtest.Equals(t, 2, blobCount)
 
 	blobs := mIdx.Lookup(bhInIdx1)
-	rtest.Equals(t, []restic.PackedBlob{blob1}, blobs)
+	rtest.Equals(t, []*pack.PackedBlob{blob1}, blobs)
 
 	blobs = mIdx.Lookup(bhInIdx2)
-	rtest.Equals(t, []restic.PackedBlob{blob2}, blobs)
+	rtest.Equals(t, []*pack.PackedBlob{blob2}, blobs)
 
 	blobs = mIdx.Lookup(restic.NewRandomBlobHandle())
 	rtest.Assert(t, blobs == nil, "Expected no blobs when fetching with a random id")
 
 	// merge another index containing identical blobs
 	idx3 := index.NewIndex()
-	idx3.StorePack(blob1.PackID, restic.Blobs{blob1.Blob})
-	idx3.StorePack(blob2.PackID, restic.Blobs{blob2.Blob})
+	idx3.StorePack(blob1.PackID(), pack.Blobs{blob1.Blob})
+	idx3.StorePack(blob2.PackID(), pack.Blobs{blob2.Blob})
 
 	mIdx.Insert(idx3)
 	finalIndexes, idxCount, newIDs := index.TestMergeIndex(t, mIdx)
@@ -268,10 +270,10 @@ func TestMasterMergeFinalIndexes(t *testing.T) {
 
 	// Index should have same entries as before!
 	blobs = mIdx.Lookup(bhInIdx1)
-	rtest.Equals(t, []restic.PackedBlob{blob1}, blobs)
+	rtest.Equals(t, []*pack.PackedBlob{blob1}, blobs)
 
 	blobs = mIdx.Lookup(bhInIdx2)
-	rtest.Equals(t, []restic.PackedBlob{blob2}, blobs)
+	rtest.Equals(t, []*pack.PackedBlob{blob2}, blobs)
 
 	blobCount = 0
 	for range mIdx.Values() {
@@ -448,9 +450,9 @@ func testIndexSave(t *testing.T, version uint) {
 
 			idx := index.NewMasterIndex()
 			rtest.OK(t, idx.Load(context.TODO(), repo, nil, nil))
-			blobs := make(map[restic.PackedBlob]struct{})
+			blobs := make(map[pack.PackedBlob]struct{})
 			for pb := range idx.Values() {
-				blobs[pb] = struct{}{}
+				blobs[*pb] = struct{}{}
 			}
 
 			rtest.OK(t, test.saver(idx, unpacked))
@@ -458,8 +460,8 @@ func testIndexSave(t *testing.T, version uint) {
 			rtest.OK(t, idx.Load(context.TODO(), repo, nil, nil))
 
 			for pb := range idx.Values() {
-				if _, ok := blobs[pb]; ok {
-					delete(blobs, pb)
+				if _, ok := blobs[*pb]; ok {
+					delete(blobs, *pb)
 				} else {
 					t.Fatalf("unexpected blobs %v", pb)
 				}
@@ -481,9 +483,9 @@ func testIndexSavePartial(t *testing.T, version uint) {
 	// capture blob list before adding fourth snapshot
 	idx := index.NewMasterIndex()
 	rtest.OK(t, idx.Load(context.TODO(), repo, nil, nil))
-	blobs := make(map[restic.PackedBlob]struct{})
+	blobs := make(map[pack.PackedBlob]struct{})
 	for pb := range idx.Values() {
-		blobs[pb] = struct{}{}
+		blobs[*pb] = struct{}{}
 	}
 
 	// add+remove new snapshot and track its pack files
@@ -502,8 +504,8 @@ func testIndexSavePartial(t *testing.T, version uint) {
 	idx = index.NewMasterIndex()
 	rtest.OK(t, idx.Load(context.TODO(), repo, nil, nil))
 	for pb := range idx.Values() {
-		if _, ok := blobs[pb]; ok {
-			delete(blobs, pb)
+		if _, ok := blobs[*pb]; ok {
+			delete(blobs, *pb)
 		} else {
 			t.Fatalf("unexpected blobs %v", pb)
 		}
@@ -516,7 +518,7 @@ func testIndexSavePartial(t *testing.T, version uint) {
 	checker.TestCheckRepo(t, repo)
 }
 
-func loadIndexAndCollectBlobs(t *testing.T, repo restic.ListerLoaderUnpacked, master *index.MasterIndex, indexCount int) map[restic.PackedBlob]struct{} {
+func loadIndexAndCollectBlobs(t *testing.T, repo restic.ListerLoaderUnpacked, master *index.MasterIndex, indexCount int) map[pack.PackedBlob]struct{} {
 	p := progress.NewCounter(0, 0, nil)
 	rtest.OK(t, master.Load(context.TODO(), repo, p, nil))
 	v, max := p.Get()
@@ -525,10 +527,10 @@ func loadIndexAndCollectBlobs(t *testing.T, repo restic.ListerLoaderUnpacked, ma
 	return collectBlobs(master)
 }
 
-func collectBlobs(master *index.MasterIndex) map[restic.PackedBlob]struct{} {
-	s := make(map[restic.PackedBlob]struct{})
+func collectBlobs(master *index.MasterIndex) map[pack.PackedBlob]struct{} {
+	s := make(map[pack.PackedBlob]struct{})
 	for pb := range master.Values() {
-		s[pb] = struct{}{}
+		s[*pb] = struct{}{}
 	}
 	return s
 }
@@ -588,17 +590,17 @@ func TestRewriteOversizedIndex(t *testing.T) {
 		return idx.Len(restic.DataBlob) > 2*fullIndexCount
 	}
 
-	var blobs restic.Blobs
+	var blobs pack.Blobs
 
 	// build oversized index
 	idx := index.NewIndex()
 	numPacks := 5
 	for p := 0; p < numPacks; p++ {
 		packID := restic.NewRandomID()
-		packBlobs := make(restic.Blobs, 0, fullIndexCount)
+		packBlobs := make(pack.Blobs, 0, fullIndexCount)
 
 		for i := 0; i < fullIndexCount; i++ {
-			blob := restic.Blob{
+			blob := pack.Blob{
 				BlobHandle: restic.BlobHandle{
 					Type: restic.DataBlob,
 					ID:   restic.NewRandomID(),
@@ -645,17 +647,17 @@ func TestRewriteSplitPacks(t *testing.T) {
 	bh2 := restic.NewRandomBlobHandle()
 	bhOther := restic.NewRandomBlobHandle()
 
-	blob1 := restic.PackedBlob{
-		PackID: restic.NewRandomID(),
-		Blob: restic.Blob{
+	blob1 := &pack.PackedBlob{
+		Pack: restic.NewRandomID(),
+		Blob: pack.Blob{
 			BlobHandle: bh1,
 			Length:     uint(crypto.CiphertextLength(10)),
 			Offset:     0,
 		},
 	}
-	blob2 := restic.PackedBlob{
-		PackID: blob1.PackID,
-		Blob: restic.Blob{
+	blob2 := &pack.PackedBlob{
+		Pack: blob1.PackID(),
+		Blob: pack.Blob{
 			BlobHandle:         bh2,
 			Length:             uint(crypto.CiphertextLength(100)),
 			Offset:             10,
@@ -663,9 +665,9 @@ func TestRewriteSplitPacks(t *testing.T) {
 		},
 	}
 	// used to force index repacking
-	blobOther := restic.PackedBlob{
-		PackID: restic.NewRandomID(),
-		Blob: restic.Blob{
+	blobOther := &pack.PackedBlob{
+		Pack: restic.NewRandomID(),
+		Blob: pack.Blob{
 			BlobHandle: bhOther,
 			Length:     uint(crypto.CiphertextLength(100)),
 			Offset:     10,
@@ -673,25 +675,25 @@ func TestRewriteSplitPacks(t *testing.T) {
 	}
 
 	mi := index.NewMasterIndex()
-	rtest.OK(t, mi.StorePack(context.TODO(), blob1.PackID, restic.Blobs{blob1.Blob}, unpacked))
-	rtest.OK(t, mi.StorePack(context.TODO(), blobOther.PackID, restic.Blobs{blobOther.Blob}, unpacked))
+	rtest.OK(t, mi.StorePack(context.TODO(), blob1.PackID(), pack.Blobs{blob1.Blob}, unpacked))
+	rtest.OK(t, mi.StorePack(context.TODO(), blobOther.PackID(), pack.Blobs{blobOther.Blob}, unpacked))
 	rtest.OK(t, mi.Flush(context.TODO(), unpacked))
-	rtest.OK(t, mi.StorePack(context.TODO(), blob2.PackID, restic.Blobs{blob2.Blob}, unpacked))
-	rtest.OK(t, mi.StorePack(context.TODO(), blobOther.PackID, restic.Blobs{blobOther.Blob}, unpacked))
+	rtest.OK(t, mi.StorePack(context.TODO(), blob2.PackID(), pack.Blobs{blob2.Blob}, unpacked))
+	rtest.OK(t, mi.StorePack(context.TODO(), blobOther.PackID(), pack.Blobs{blobOther.Blob}, unpacked))
 	rtest.OK(t, mi.Flush(context.TODO(), unpacked))
 
-	rtest.OK(t, mi.Rewrite(context.TODO(), unpacked, restic.NewIDSet(blobOther.PackID), nil, nil, index.MasterIndexRewriteOpts{}))
+	rtest.OK(t, mi.Rewrite(context.TODO(), unpacked, restic.NewIDSet(blobOther.PackID()), nil, nil, index.MasterIndexRewriteOpts{}))
 
 	mi = index.NewMasterIndex()
 	rtest.OK(t, mi.Load(context.TODO(), repo, nil, nil))
 
 	// test that all blobs are still in the index
-	for _, blob := range []restic.PackedBlob{blob1, blob2} {
-		blobs := mi.Lookup(blob.BlobHandle)
-		rtest.Equals(t, []restic.PackedBlob{blob}, blobs)
+	for _, blob := range []*pack.PackedBlob{blob1, blob2} {
+		blobs := mi.Lookup(blob.Handle())
+		rtest.Equals(t, []*pack.PackedBlob{blob}, blobs)
 	}
 
-	blobs := mi.Lookup(blobOther.BlobHandle)
+	blobs := mi.Lookup(blobOther.Handle())
 	rtest.Equals(t, nil, blobs)
 }
 
@@ -713,17 +715,17 @@ func TestRewriteFullPacks(t *testing.T) {
 	packA := restic.NewRandomID()
 	packB := restic.NewRandomID()
 
-	blobA := restic.PackedBlob{
-		PackID: packA,
-		Blob: restic.Blob{
+	blobA := &pack.PackedBlob{
+		Pack: packA,
+		Blob: pack.Blob{
 			BlobHandle: restic.NewRandomBlobHandle(),
 			Length:     uint(crypto.CiphertextLength(10)),
 			Offset:     0,
 		},
 	}
-	blobB := restic.PackedBlob{
-		PackID: packB,
-		Blob: restic.Blob{
+	blobB := &pack.PackedBlob{
+		Pack: packB,
+		Blob: pack.Blob{
 			BlobHandle: restic.NewRandomBlobHandle(),
 			Length:     uint(crypto.CiphertextLength(50)),
 			Offset:     0,
@@ -731,11 +733,11 @@ func TestRewriteFullPacks(t *testing.T) {
 	}
 
 	mi := index.NewMasterIndex()
-	rtest.OK(t, mi.StorePack(context.TODO(), packA, restic.Blobs{blobA.Blob}, unpacked))
+	rtest.OK(t, mi.StorePack(context.TODO(), packA, pack.Blobs{blobA.Blob}, unpacked))
 	rtest.OK(t, mi.Flush(context.TODO(), unpacked))
-	rtest.OK(t, mi.StorePack(context.TODO(), packB, restic.Blobs{blobB.Blob}, unpacked))
+	rtest.OK(t, mi.StorePack(context.TODO(), packB, pack.Blobs{blobB.Blob}, unpacked))
 	rtest.OK(t, mi.Flush(context.TODO(), unpacked))
-	rtest.OK(t, mi.StorePack(context.TODO(), packB, restic.Blobs{blobB.Blob}, unpacked))
+	rtest.OK(t, mi.StorePack(context.TODO(), packB, pack.Blobs{blobB.Blob}, unpacked))
 	rtest.OK(t, mi.Flush(context.TODO(), unpacked))
 
 	indexIDs := mi.IDs()
@@ -750,6 +752,6 @@ func TestRewriteFullPacks(t *testing.T) {
 	rtest.Equals(t, 2, len(afterRewrite))
 	rtest.Equals(t, 2, len(afterRewrite.Intersect(indexIDs)))
 
-	rtest.Equals(t, []restic.PackedBlob{blobA}, mi2.Lookup(blobA.BlobHandle))
-	rtest.Equals(t, []restic.PackedBlob{blobB}, mi2.Lookup(blobB.BlobHandle))
+	rtest.Equals(t, []*pack.PackedBlob{blobA}, mi2.Lookup(blobA.Handle()))
+	rtest.Equals(t, []*pack.PackedBlob{blobB}, mi2.Lookup(blobB.Handle()))
 }

internal/repository/index_list.go

@@ -28,7 +28,7 @@ func AllIndexBlobs(ctx context.Context, lister restic.Lister, loader restic.Load
 				if ctx.Err() != nil {
 					return ctx.Err()
 				}
-				if !yield(IndexBlob{Handle: blob.BlobHandle}) {
+				if !yield(IndexBlob{Handle: blob.Handle()}) {
 					return stopIteration
 				}
 			}

internal/repository/index_testutil_test.go

@@ -1,14 +1,15 @@
 package repository
 
 import (
+	"github.com/restic/restic/internal/repository/pack"
 	"github.com/restic/restic/internal/restic"
 )
 
 // BlobsInPack returns index entries for blobs stored in packID, sorted by offset.
-func BlobsInPack(repo *Repository, packID restic.ID) restic.Blobs {
-	var blobs restic.Blobs
+func BlobsInPack(repo *Repository, packID restic.ID) pack.Blobs {
+	var blobs pack.Blobs
 	for pb := range repo.idx.Values() {
-		if pb.PackID.Equal(packID) {
+		if pb.PackID().Equal(packID) {
 			blobs = append(blobs, pb.Blob)
 		}
 	}

internal/repository/pack/blob.go

@@ -0,0 +1,32 @@
+package pack
+
+import (
+	"fmt"
+
+	"github.com/restic/restic/internal/crypto"
+	"github.com/restic/restic/internal/restic"
+)
+
+// Blob is one part of a file or a tree with pack layout information.
+type Blob struct {
+	restic.BlobHandle
+	Length             uint
+	Offset             uint
+	UncompressedLength uint
+}
+
+func (b Blob) String() string {
+	return fmt.Sprintf("<Blob (%v) %v, offset %v, length %v, uncompressed length %v>",
+		b.Type, b.ID.Str(), b.Offset, b.Length, b.UncompressedLength)
+}
+
+func (b Blob) DataLength() uint {
+	if b.UncompressedLength != 0 {
+		return b.UncompressedLength
+	}
+	return uint(crypto.PlaintextLength(int(b.Length)))
+}
+
+func (b Blob) IsCompressed() bool {
+	return b.UncompressedLength != 0
+}

internal/repository/pack/blobs.go

@@ -0,0 +1,15 @@
+package pack
+
+import (
+	"cmp"
+	"slices"
+)
+
+// Blobs is a list of blobs with pack layout information (offset, length, ...).
+type Blobs []Blob
+
+func (b Blobs) Sort() {
+	slices.SortFunc(b, func(a, b Blob) int {
+		return cmp.Compare(a.Offset, b.Offset)
+	})
+}

internal/repository/pack/blobs_test.go

@@ -0,0 +1,24 @@
+package pack
+
+import (
+	"testing"
+
+	rtest "github.com/restic/restic/internal/test"
+)
+
+func TestBlobsSort(t *testing.T) {
+	blobs := Blobs{
+		{Offset: 100},
+		{Offset: 0},
+		{Offset: 50},
+	}
+	blobs.Sort()
+	rtest.Equals(t, uint(0), blobs[0].Offset)
+	rtest.Equals(t, uint(50), blobs[1].Offset)
+	rtest.Equals(t, uint(100), blobs[2].Offset)
+}
+
+func TestBlobsSortNilSlice(t *testing.T) {
+	var blobs Blobs
+	blobs.Sort()
+}

internal/repository/pack/pack.go

@@ -21,7 +21,7 @@ var ErrBroken = errors.New("packer cannot be used after a write error")
 
 // Packer is used to create a new Pack.
 type Packer struct {
-	blobs restic.Blobs
+	blobs []Blob
 
 	bytes uint
 	k     *crypto.Key
@@ -56,7 +56,7 @@ func (p *Packer) Add(t restic.BlobType, id restic.ID, data []byte, uncompressedL
 		return n, p.err
 	}
 
-	c := restic.Blob{
+	c := Blob{
 		BlobHandle:         restic.BlobHandle{Type: t, ID: id},
 		Length:             uint(n),
 		Offset:             p.bytes,
@@ -129,7 +129,7 @@ func (p *Packer) Finalize() error {
 	return nil
 }
 
-func verifyHeader(k *crypto.Key, header []byte, expected restic.Blobs) error {
+func verifyHeader(k *crypto.Key, header []byte, expected []Blob) error {
 	// do not offer a way to skip the pack header verification, as pack headers are usually small enough
 	// to not result in a significant performance impact
 
@@ -157,7 +157,7 @@ func (p *Packer) HeaderOverhead() int {
 }
 
 // makeHeader constructs the header for p.
-func makeHeader(blobs restic.Blobs) ([]byte, error) {
+func makeHeader(blobs []Blob) ([]byte, error) {
 	buf := make([]byte, 0, len(blobs)*int(entrySize))
 
 	for _, b := range blobs {
@@ -232,7 +232,7 @@ func (p *Packer) HeaderFull() bool {
 }
 
 // Blobs returns the slice of blobs that have been written.
-func (p *Packer) Blobs() restic.Blobs {
+func (p *Packer) Blobs() Blobs {
 	p.m.Lock()
 	defer p.m.Unlock()
 
@@ -348,7 +348,7 @@ func (e InvalidFileError) Error() string {
 
 // List returns the list of entries found in a pack file and the length of the
 // header (including header size and crypto overhead)
-func List(k *crypto.Key, rd io.ReaderAt, size int64) (entries restic.Blobs, hdrSize uint32, err error) {
+func List(k *crypto.Key, rd io.ReaderAt, size int64) (entries Blobs, hdrSize uint32, err error) {
 	buf, err := readHeader(rd, size)
 	if err != nil {
 		return nil, 0, err
@@ -367,7 +367,7 @@ func List(k *crypto.Key, rd io.ReaderAt, size int64) (entries restic.Blobs, hdrS
 	}
 
 	// might over allocate a bit if all blobs have EntrySize but only by a few percent
-	entries = make(restic.Blobs, 0, uint(len(buf))/plainEntrySize)
+	entries = make(Blobs, 0, uint(len(buf))/plainEntrySize)
 
 	pos := uint(0)
 	for len(buf) > 0 {
@@ -385,7 +385,7 @@ func List(k *crypto.Key, rd io.ReaderAt, size int64) (entries restic.Blobs, hdrS
 	return entries, hdrSize, nil
 }
 
-func parseHeaderEntry(p []byte) (b restic.Blob, size uint, err error) {
+func parseHeaderEntry(p []byte) (b Blob, size uint, err error) {
 	l := uint(len(p))
 	size = plainEntrySize
 	if l < plainEntrySize {
@@ -427,7 +427,7 @@ func CalculateEntrySize(compressed bool) int {
 	return int(plainEntrySize)
 }
 
-func CalculateHeaderSize(blobs restic.Blobs) int {
+func CalculateHeaderSize(blobs Blobs) int {
 	size := headerSize
 	for _, blob := range blobs {
 		size += CalculateEntrySize(blob.IsCompressed())
@@ -439,10 +439,10 @@ func CalculateHeaderSize(blobs restic.Blobs) int {
 // If onlyHdr is set to true, only the size of the header is returned
 // Note that this function only gives correct sizes, if there are no
 // duplicates in the index.
-func Size(ctx context.Context, mi restic.ListBlobser, onlyHdr bool) (map[restic.ID]int64, error) {
+func Size(ctx context.Context, idx restic.ListBlobser, onlyHdr bool) (map[restic.ID]int64, error) {
 	packSize := make(map[restic.ID]int64)
 
-	err := mi.ListBlobs(ctx, func(blob restic.PackBlob) {
+	err := idx.ListBlobs(ctx, func(blob restic.PackBlob) {
 		packID := blob.PackID()
 		size, ok := packSize[packID]
 		if !ok {

internal/repository/pack/pack_internal_test.go

@@ -182,7 +182,7 @@ func TestReadRecords(t *testing.T) {
 func TestUnpackedVerification(t *testing.T) {
 	// create random keys
 	k := crypto.NewRandomKey()
-	blobs := restic.Blobs{
+	blobs := []Blob{
 		{
 			BlobHandle:         restic.NewRandomBlobHandle(),
 			Length:             42,

internal/repository/pack/packedblob.go

@@ -0,0 +1,19 @@
+package pack
+
+import "github.com/restic/restic/internal/restic"
+
+// PackedBlob is one index entry for a blob in a pack (may be duplicate across indexes).
+type PackedBlob struct {
+	Pack restic.ID
+	Blob Blob
+}
+
+func (pb *PackedBlob) PackID() restic.ID { return pb.Pack }
+
+func (pb *PackedBlob) Handle() restic.BlobHandle { return pb.Blob.BlobHandle }
+
+func (pb *PackedBlob) CiphertextLength() uint { return pb.Blob.Length }
+
+func (pb *PackedBlob) PlaintextLength() uint { return pb.Blob.DataLength() }
+
+func (pb *PackedBlob) IsCompressed() bool { return pb.Blob.IsCompressed() }

internal/repository/repack.go

@@ -7,6 +7,8 @@ import (
 	"github.com/restic/restic/internal/debug"
 	"github.com/restic/restic/internal/errors"
 	"github.com/restic/restic/internal/feature"
+	"github.com/restic/restic/internal/repository/index"
+	"github.com/restic/restic/internal/repository/pack"
 	"github.com/restic/restic/internal/restic"
 	"github.com/restic/restic/internal/ui/progress"
 
@@ -80,11 +82,11 @@ func repack(
 	}
 
 	var keepMutex sync.Mutex
-	downloadQueue := make(chan restic.PackBlobs)
+	downloadQueue := make(chan index.PackBlobs)
 	wg.Go(func() error {
 		defer close(downloadQueue)
 		for pbs := range repo.listPacksFromIndex(wgCtx, packs) {
-			var packBlobs restic.Blobs
+			var packBlobs pack.Blobs
 			keepMutex.Lock()
 			// filter out unnecessary blobs
 			for _, entry := range pbs.Blobs {
@@ -96,7 +98,7 @@ func repack(
 			keepMutex.Unlock()
 
 			select {
-			case downloadQueue <- restic.PackBlobs{PackID: pbs.PackID, Blobs: packBlobs}:
+			case downloadQueue <- index.PackBlobs{PackID: pbs.PackID, Blobs: packBlobs}:
 			case <-wgCtx.Done():
 				return wgCtx.Err()
 			}

internal/repository/repair_pack.go

@@ -6,6 +6,7 @@ import (
 	"io"
 	"slices"
 
+	"github.com/restic/restic/internal/repository/pack"
 	"github.com/restic/restic/internal/restic"
 	"github.com/restic/restic/internal/ui/progress"
 )
@@ -71,8 +72,8 @@ func RepairPacks(ctx context.Context, repo *Repository, ids restic.IDSet, printe
 	return nil
 }
 
-func resolveBlobsForPacks(ctx context.Context, repo *Repository, ids restic.IDSet) (map[restic.ID]restic.Blobs, error) {
-	packToBlobs := make(map[restic.ID]restic.Blobs)
+func resolveBlobsForPacks(ctx context.Context, repo *Repository, ids restic.IDSet) (map[restic.ID]pack.Blobs, error) {
+	packToBlobs := make(map[restic.ID]pack.Blobs)
 
 	err := repo.List(ctx, restic.PackFile, func(id restic.ID, size int64) error {
 		if ids.Has(id) {
@@ -90,7 +91,7 @@ func resolveBlobsForPacks(ctx context.Context, repo *Repository, ids restic.IDSe
 	return packToBlobs, nil
 }
 
-func reuploadBlobsFromPack(ctx context.Context, repo *Repository, packID restic.ID, blobs restic.Blobs, printer progress.Printer, uploader restic.BlobSaverWithAsync) error {
+func reuploadBlobsFromPack(ctx context.Context, repo *Repository, packID restic.ID, blobs pack.Blobs, printer progress.Printer, uploader restic.BlobSaverWithAsync) error {
 	err := repo.loadBlobsFromPack(ctx, packID, blobs, func(blob restic.BlobHandle, buf []byte, err error) error {
 		if err != nil {
 			printer.E("failed to load blob %v: %v", blob.ID, err)

internal/repository/repository.go

@@ -213,7 +213,7 @@ type haver interface {
 }
 
 // sortCachedPacksFirst moves all cached pack files to the front of blobs.
-func sortCachedPacksFirst(cache haver, blobs []restic.PackedBlob) {
+func sortCachedPacksFirst(cache haver, blobs []*pack.PackedBlob) {
 	if cache == nil {
 		return
 	}
@@ -224,10 +224,10 @@ func sortCachedPacksFirst(cache haver, blobs []restic.PackedBlob) {
 	}
 
 	cached := blobs[:0]
-	noncached := make([]restic.PackedBlob, 0, len(blobs)/2)
+	noncached := make([]*pack.PackedBlob, 0, len(blobs)/2)
 
 	for _, blob := range blobs {
-		if cache.Has(backend.Handle{Type: restic.PackFile, Name: blob.PackID.String()}) {
+		if cache.Has(backend.Handle{Type: restic.PackFile, Name: blob.PackID().String()}) {
 			cached = append(cached, blob)
 			continue
 		}
@@ -256,7 +256,7 @@ func (r *Repository) LoadBlob(ctx context.Context, t restic.BlobType, id restic.
 	if err != nil {
 		if r.cache != nil {
 			for _, blob := range blobs {
-				h := backend.Handle{Type: restic.PackFile, Name: blob.PackID.String(), IsMetadata: blob.Type.IsMetadata()}
+				h := backend.Handle{Type: restic.PackFile, Name: blob.PackID().String(), IsMetadata: blob.Blob.Type.IsMetadata()}
 				// ignore errors as there's not much we can do here
 				_ = r.cache.Forget(h)
 			}
@@ -267,28 +267,28 @@ func (r *Repository) LoadBlob(ctx context.Context, t restic.BlobType, id restic.
 	return buf, err
 }
 
-func (r *Repository) loadBlob(ctx context.Context, blobs []restic.PackedBlob, buf []byte) ([]byte, error) {
+func (r *Repository) loadBlob(ctx context.Context, blobs []*pack.PackedBlob, buf []byte) ([]byte, error) {
 	var lastError error
 	for _, blob := range blobs {
-		debug.Log("blob %v found: %v", blob.BlobHandle, blob)
+		debug.Log("blob %v found: %v", blob.Handle(), blob)
 		// load blob from pack
-		h := backend.Handle{Type: restic.PackFile, Name: blob.PackID.String(), IsMetadata: blob.Type.IsMetadata()}
+		h := backend.Handle{Type: restic.PackFile, Name: blob.PackID().String(), IsMetadata: blob.Blob.Type.IsMetadata()}
 
 		switch {
-		case cap(buf) < int(blob.Length):
-			buf = make([]byte, blob.Length)
-		case len(buf) != int(blob.Length):
-			buf = buf[:blob.Length]
+		case cap(buf) < int(blob.Blob.Length):
+			buf = make([]byte, blob.Blob.Length)
+		case len(buf) != int(blob.Blob.Length):
+			buf = buf[:blob.Blob.Length]
 		}
 
-		_, err := backend.ReadAt(ctx, r.be, h, int64(blob.Offset), buf)
+		_, err := backend.ReadAt(ctx, r.be, h, int64(blob.Blob.Offset), buf)
 		if err != nil {
 			debug.Log("error loading blob %v: %v", blob, err)
 			lastError = err
 			continue
 		}
 
-		it := newPackBlobIterator(blob.PackID, newByteReader(buf), blob.Offset, restic.Blobs{blob.Blob}, r.key, r.getZstdDecoder())
+		it := newPackBlobIterator(blob.PackID(), newByteReader(buf), blob.Blob.Offset, pack.Blobs{blob.Blob}, r.key, r.getZstdDecoder())
 		pbv, err := it.Next()
 
 		if err == nil {
@@ -314,7 +314,7 @@ func (r *Repository) loadBlob(ctx context.Context, blobs []restic.PackedBlob, bu
 		return nil, lastError
 	}
 
-	return nil, errors.Errorf("loading %v from %v packs failed", blobs[0].BlobHandle, len(blobs))
+	return nil, errors.Errorf("loading %v from %v packs failed", blobs[0].Handle(), len(blobs))
 }
 
 func (r *Repository) getZstdEncoder() *zstd.Encoder {
@@ -673,8 +673,8 @@ func (r *Repository) Connections() uint {
 func (r *Repository) LookupBlob(tpe restic.BlobType, id restic.ID) []restic.PackBlob {
 	entries := r.idx.Lookup(restic.BlobHandle{Type: tpe, ID: id})
 	out := make([]restic.PackBlob, len(entries))
-	for i, pb := range entries {
-		out[i] = restic.AsPackBlob(pb)
+	for i, e := range entries {
+		out[i] = e
 	}
 	return out
 }
@@ -691,13 +691,13 @@ func (r *Repository) ListBlobs(ctx context.Context, fn func(restic.PackBlob)) er
 		if ctx.Err() != nil {
 			return ctx.Err()
 		}
-		fn(restic.AsPackBlob(blob))
+		fn(blob)
 	}
 	return nil
 }
 
 // listPacksFromIndex returns index entries for the given packs, grouped by pack file.
-func (r *Repository) listPacksFromIndex(ctx context.Context, packs restic.IDSet) <-chan restic.PackBlobs {
+func (r *Repository) listPacksFromIndex(ctx context.Context, packs restic.IDSet) <-chan index.PackBlobs {
 	return r.idx.ListPacks(ctx, packs)
 }
 
@@ -964,7 +964,7 @@ func (r *Repository) List(ctx context.Context, t restic.FileType, fn func(restic
 }
 
 // listPack returns blob entries from the pack file header including offsets.
-func (r *Repository) listPack(ctx context.Context, id restic.ID, size int64) (restic.Blobs, error) {
+func (r *Repository) listPack(ctx context.Context, id restic.ID, size int64) (pack.Blobs, error) {
 	h := backend.Handle{Type: restic.PackFile, Name: id.String()}
 
 	entries, _, err := pack.List(r.Key(), backend.ReaderAt(ctx, r.be, h), size)
@@ -977,7 +977,7 @@ func (r *Repository) listPack(ctx context.Context, id restic.ID, size int64) (re
 		// retry on error
 		entries, _, err = pack.List(r.Key(), backend.ReaderAt(ctx, r.be, h), size)
 	}
-	return entries, err
+	return pack.Blobs(entries), err
 }
 
 // ListPackHandles returns the blob handles stored in the pack file header.
@@ -1074,12 +1074,12 @@ func (r *Repository) LoadBlobsFromPack(ctx context.Context, packID restic.ID, ha
 	return r.loadBlobsFromPack(ctx, packID, blobs, handleBlobFn)
 }
 
-func (r *Repository) blobsInPack(packID restic.ID, handles []restic.BlobHandle) (restic.Blobs, error) {
-	blobs := make(restic.Blobs, 0, len(handles))
+func (r *Repository) blobsInPack(packID restic.ID, handles []restic.BlobHandle) (pack.Blobs, error) {
+	blobs := make(pack.Blobs, 0, len(handles))
 	for _, h := range handles {
 		found := false
 		for _, pb := range r.idx.Lookup(h) {
-			if pb.PackID.Equal(packID) {
+			if pb.PackID().Equal(packID) {
 				blobs = append(blobs, pb.Blob)
 				found = true
 				break
@@ -1092,11 +1092,11 @@ func (r *Repository) blobsInPack(packID restic.ID, handles []restic.BlobHandle)
 	return blobs, nil
 }
 
-func (r *Repository) loadBlobsFromPack(ctx context.Context, packID restic.ID, blobs restic.Blobs, handleBlobFn func(blob restic.BlobHandle, buf []byte, err error) error) error {
+func (r *Repository) loadBlobsFromPack(ctx context.Context, packID restic.ID, blobs pack.Blobs, handleBlobFn func(blob restic.BlobHandle, buf []byte, err error) error) error {
 	return streamPack(ctx, r.be.Load, r.LoadBlob, r.getZstdDecoder(), r.key, packID, blobs, handleBlobFn)
 }
 
-func streamPack(ctx context.Context, beLoad backendLoadFn, loadBlobFn loadBlobFn, dec *zstd.Decoder, key *crypto.Key, packID restic.ID, blobs restic.Blobs, handleBlobFn func(blob restic.BlobHandle, buf []byte, err error) error) error {
+func streamPack(ctx context.Context, beLoad backendLoadFn, loadBlobFn loadBlobFn, dec *zstd.Decoder, key *crypto.Key, packID restic.ID, blobs pack.Blobs, handleBlobFn func(blob restic.BlobHandle, buf []byte, err error) error) error {
 	if len(blobs) == 0 {
 		// nothing to do
 		return nil
@@ -1139,7 +1139,7 @@ func streamPack(ctx context.Context, beLoad backendLoadFn, loadBlobFn loadBlobFn
 	return streamPackPart(ctx, beLoad, loadBlobFn, dec, key, packID, blobs[lowerIdx:], handleBlobFn)
 }
 
-func streamPackPart(ctx context.Context, beLoad backendLoadFn, loadBlobFn loadBlobFn, dec *zstd.Decoder, key *crypto.Key, packID restic.ID, blobs restic.Blobs, handleBlobFn func(blob restic.BlobHandle, buf []byte, err error) error) error {
+func streamPackPart(ctx context.Context, beLoad backendLoadFn, loadBlobFn loadBlobFn, dec *zstd.Decoder, key *crypto.Key, packID restic.ID, blobs pack.Blobs, handleBlobFn func(blob restic.BlobHandle, buf []byte, err error) error) error {
 	h := backend.Handle{Type: restic.PackFile, Name: packID.String(), IsMetadata: blobs[0].Type.IsMetadata()}
 
 	dataStart := blobs[0].Offset
@@ -1249,7 +1249,7 @@ type packBlobIterator struct {
 	rd            discardReader
 	currentOffset uint
 
-	blobs restic.Blobs
+	blobs pack.Blobs
 	key   *crypto.Key
 	dec   *zstd.Decoder
 
@@ -1265,7 +1265,7 @@ type packBlobValue struct {
 var errPackEOF = errors.New("reached EOF of pack file")
 
 func newPackBlobIterator(packID restic.ID, rd discardReader, currentOffset uint,
-	blobs restic.Blobs, key *crypto.Key, dec *zstd.Decoder) *packBlobIterator {
+	blobs pack.Blobs, key *crypto.Key, dec *zstd.Decoder) *packBlobIterator {
 	return &packBlobIterator{
 		packID:        packID,
 		rd:            rd,

internal/repository/repository_internal_test.go

@@ -17,6 +17,7 @@ import (
 	"github.com/restic/restic/internal/crypto"
 	"github.com/restic/restic/internal/errors"
 	"github.com/restic/restic/internal/repository/index"
+	"github.com/restic/restic/internal/repository/pack"
 	"github.com/restic/restic/internal/restic"
 	rtest "github.com/restic/restic/internal/test"
 )
@@ -27,7 +28,7 @@ func (c mapcache) Has(h backend.Handle) bool { return c[h] }
 
 func TestSortCachedPacksFirst(t *testing.T) {
 	var (
-		blobs, sorted [100]restic.PackedBlob
+		blobs, sorted [100]*pack.PackedBlob
 
 		cache = make(mapcache)
 		r     = rand.New(rand.NewSource(1261))
@@ -36,7 +37,7 @@ func TestSortCachedPacksFirst(t *testing.T) {
 	for i := 0; i < len(blobs); i++ {
 		var id restic.ID
 		r.Read(id[:])
-		blobs[i] = restic.PackedBlob{PackID: id}
+		blobs[i] = &pack.PackedBlob{Pack: id, Blob: pack.Blob{}}
 
 		if i%3 == 0 {
 			h := backend.Handle{Name: id.String(), Type: backend.PackFile}
@@ -46,8 +47,8 @@ func TestSortCachedPacksFirst(t *testing.T) {
 
 	copy(sorted[:], blobs[:])
 	sort.SliceStable(sorted[:], func(i, j int) bool {
-		hi := backend.Handle{Type: backend.PackFile, Name: sorted[i].PackID.String()}
-		hj := backend.Handle{Type: backend.PackFile, Name: sorted[j].PackID.String()}
+		hi := backend.Handle{Type: backend.PackFile, Name: sorted[i].PackID().String()}
+		hj := backend.Handle{Type: backend.PackFile, Name: sorted[j].PackID().String()}
 		return cache.Has(hi) && !cache.Has(hj)
 	})
 
@@ -59,7 +60,7 @@ func BenchmarkSortCachedPacksFirst(b *testing.B) {
 	const nblobs = 512 // Corresponds to a file of ca. 2GB.
 
 	var (
-		blobs [nblobs]restic.PackedBlob
+		blobs [nblobs]*pack.PackedBlob
 		cache = make(mapcache)
 		r     = rand.New(rand.NewSource(1261))
 	)
@@ -67,7 +68,7 @@ func BenchmarkSortCachedPacksFirst(b *testing.B) {
 	for i := 0; i < nblobs; i++ {
 		var id restic.ID
 		r.Read(id[:])
-		blobs[i] = restic.PackedBlob{PackID: id}
+		blobs[i] = &pack.PackedBlob{Pack: id, Blob: pack.Blob{}}
 
 		if i%3 == 0 {
 			h := backend.Handle{Name: id.String(), Type: backend.PackFile}
@@ -75,7 +76,7 @@ func BenchmarkSortCachedPacksFirst(b *testing.B) {
 		}
 	}
 
-	var cpy [nblobs]restic.PackedBlob
+	var cpy [nblobs]*pack.PackedBlob
 	b.ReportAllocs()
 	b.ResetTimer()
 
@@ -96,7 +97,7 @@ func benchmarkLoadIndex(b *testing.B, version uint) {
 	idx := index.NewIndex()
 
 	for i := 0; i < 5000; i++ {
-		idx.StorePack(restic.NewRandomID(), restic.Blobs{
+		idx.StorePack(restic.NewRandomID(), pack.Blobs{
 			{
 				BlobHandle: restic.NewRandomBlobHandle(),
 				Length:     1234,
@@ -133,7 +134,7 @@ func loadIndex(ctx context.Context, repo restic.LoaderUnpacked, id restic.ID) (*
 }
 
 // buildPackfileWithoutHeader returns a manually built pack file without a header.
-func buildPackfileWithoutHeader(blobSizes []int, key *crypto.Key, compress bool) (blobs restic.Blobs, packfile []byte) {
+func buildPackfileWithoutHeader(blobSizes []int, key *crypto.Key, compress bool) (blobs pack.Blobs, packfile []byte) {
 	opts := []zstd.EOption{
 		// Set the compression level configured.
 		zstd.WithEncoderLevel(zstd.SpeedDefault),
@@ -173,7 +174,7 @@ func buildPackfileWithoutHeader(blobSizes []int, key *crypto.Key, compress bool)
 
 		ciphertextLength := after - before
 
-		blobs = append(blobs, restic.Blob{
+		blobs = append(blobs, pack.Blob{
 			BlobHandle: restic.BlobHandle{
 				Type: restic.DataBlob,
 				ID:   id,
@@ -280,19 +281,19 @@ func testStreamPack(t *testing.T, version uint) {
 	// first, test regular usage
 	t.Run("regular", func(t *testing.T) {
 		tests := []struct {
-			blobs          restic.Blobs
+			blobs          pack.Blobs
 			calls          int
 			shortFirstLoad bool
 		}{
 			{packfileBlobs[1:2], 1, false},
 			{packfileBlobs[2:5], 1, false},
 			{packfileBlobs[2:8], 1, false},
-			{restic.Blobs{
+			{pack.Blobs{
 				packfileBlobs[0],
 				packfileBlobs[4],
 				packfileBlobs[2],
 			}, 1, false},
-			{restic.Blobs{
+			{pack.Blobs{
 				packfileBlobs[0],
 				packfileBlobs[len(packfileBlobs)-1],
 			}, 2, false},
@@ -341,12 +342,12 @@ func testStreamPack(t *testing.T, version uint) {
 	// next, test invalid uses, which should return an error
 	t.Run("invalid", func(t *testing.T) {
 		tests := []struct {
-			blobs restic.Blobs
+			blobs pack.Blobs
 			err   string
 		}{
 			{
 				// pass one blob several times
-				blobs: restic.Blobs{
+				blobs: pack.Blobs{
 					packfileBlobs[3],
 					packfileBlobs[8],
 					packfileBlobs[3],
@@ -357,7 +358,7 @@ func testStreamPack(t *testing.T, version uint) {
 
 			{
 				// pass something that's not a valid blob in the current pack file
-				blobs: restic.Blobs{
+				blobs: pack.Blobs{
 					{
 						Offset: 123,
 						Length: 20000,
@@ -368,7 +369,7 @@ func testStreamPack(t *testing.T, version uint) {
 
 			{
 				// pass a blob that's too small
-				blobs: restic.Blobs{
+				blobs: pack.Blobs{
 					{
 						Offset: 123,
 						Length: 10,
@@ -523,7 +524,7 @@ func TestStreamPackFallback(t *testing.T) {
 
 		plaintext := rtest.Random(800, 42)
 		blobID := restic.Hash(plaintext)
-		blobs := restic.Blobs{
+		blobs := pack.Blobs{
 			{
 				Length: uint(crypto.CiphertextLength(len(plaintext))),
 				Offset: 0,

internal/repository/repository_test.go

@@ -400,7 +400,7 @@ func testRepositoryIncrementalIndex(t *testing.T, version uint) {
 		rtest.OK(t, err)
 
 		for pb := range idx.Values() {
-			packID := pb.PackID
+			packID := pb.PackID()
 			if _, ok := packEntries[packID]; !ok {
 				packEntries[packID] = make(map[restic.ID]struct{})
 			}

internal/restic/blob.go

@@ -1,46 +1,11 @@
 package restic
 
 import (
-	"cmp"
 	"fmt"
-	"slices"
 
-	"github.com/restic/restic/internal/crypto"
 	"github.com/restic/restic/internal/errors"
 )
 
-// Blob is one part of a file or a tree.
-type Blob struct {
-	BlobHandle
-	Length             uint
-	Offset             uint
-	UncompressedLength uint
-}
-
-func (b Blob) String() string {
-	return fmt.Sprintf("<Blob (%v) %v, offset %v, length %v, uncompressed length %v>",
-		b.Type, b.ID.Str(), b.Offset, b.Length, b.UncompressedLength)
-}
-
-func (b Blob) DataLength() uint {
-	if b.UncompressedLength != 0 {
-		return b.UncompressedLength
-	}
-	return uint(crypto.PlaintextLength(int(b.Length)))
-}
-
-func (b Blob) IsCompressed() bool {
-	return b.UncompressedLength != 0
-}
-
-type Blobs []Blob
-
-func (b Blobs) Sort() {
-	slices.SortFunc(b, func(a, b Blob) int {
-		return cmp.Compare(a.Offset, b.Offset)
-	})
-}
-
 // PackBlob is one index entry for a blob in a pack file.
 // The interface intentionally omits the offset at which a blob is stored in the pack.
 // This ensures that pack file internals are not leaked.
@@ -54,29 +19,6 @@ type PackBlob interface {
 	IsCompressed() bool
 }
 
-// PackedBlob is a blob stored within a file.
-type PackedBlob struct {
-	Blob
-	PackID ID
-}
-
-type packBlob struct {
-	PackedBlob
-}
-
-func (pb packBlob) PackID() ID { return pb.PackedBlob.PackID }
-
-func (pb packBlob) Handle() BlobHandle { return pb.BlobHandle }
-
-func (pb packBlob) CiphertextLength() uint { return pb.Length }
-
-func (pb packBlob) PlaintextLength() uint { return pb.DataLength() }
-
-func (pb packBlob) IsCompressed() bool { return pb.Blob.IsCompressed() }
-
-// AsPackBlob returns a PackBlob view of a PackedBlob.
-func AsPackBlob(pb PackedBlob) PackBlob { return packBlob{pb} }
-
 // BlobHandle identifies a blob of a given type.
 type BlobHandle struct {
 	ID   ID

internal/restic/blob_test.go

@@ -3,8 +3,6 @@ package restic
 import (
 	"encoding/json"
 	"testing"
-
-	rtest "github.com/restic/restic/internal/test"
 )
 
 var blobTypeJSON = []struct {
@@ -41,20 +39,3 @@ func TestBlobTypeJSON(t *testing.T) {
 		}
 	}
 }
-
-func TestBlobsSort(t *testing.T) {
-	blobs := Blobs{
-		{Offset: 100},
-		{Offset: 0},
-		{Offset: 50},
-	}
-	blobs.Sort()
-	rtest.Equals(t, uint(0), blobs[0].Offset)
-	rtest.Equals(t, uint(50), blobs[1].Offset)
-	rtest.Equals(t, uint(100), blobs[2].Offset)
-}
-
-func TestBlobsSortNilSlice(t *testing.T) {
-	var blobs Blobs
-	blobs.Sort()
-}

internal/restic/repository.go

@@ -124,11 +124,6 @@ type SaverRemoverUnpacked[FT FileTypes] interface {
 	RemoverUnpacked[FT]
 }
 
-type PackBlobs struct {
-	PackID ID
-	Blobs  Blobs
-}
-
 type TerminalCounterFactory interface {
 	// NewCounterTerminalOnly returns a new progress counter that is only shown if stdout points to a
 	// terminal. It is not shown if --quiet or --json is specified.