From a35ba02c4a1478ea9cb4ae14053fb3147a52a8ea Mon Sep 17 00:00:00 2001
From: Will Scott <will.scott@protocol.ai>
Date: Tue, 2 Nov 2021 09:58:33 +0000
Subject: [PATCH 01/10] Add ADL/single-node-view of a full unixFS file.

---
 file/file.go | 166 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 166 insertions(+)
 create mode 100644 file/file.go

diff --git a/file/file.go b/file/file.go
new file mode 100644
index 0000000..50e3a68
--- /dev/null
+++ b/file/file.go
@@ -0,0 +1,166 @@
+package file
+
+import (
+	"context"
+	"fmt"
+	"io"
+
+	dagpb "github.com/ipld/go-codec-dagpb"
+	"github.com/ipld/go-ipld-prime"
+	basicnode "github.com/ipld/go-ipld-prime/node/basic"
+)
+
+// NewUnixFSFile attempts to construct an ipld node from the base protobuf node representing the
+// root of a unixfs File.
+// It provides a `bytes` view over the file, along with access to io.Reader streaming access
+// to file data.
+func NewUnixFSFile(ctx context.Context, substrate ipld.Node, lsys *ipld.LinkSystem) (StreamableByteNode, error) {
+	if substrate.Kind() == ipld.Kind_Bytes {
+		// A raw / single-node file.
+		return &singleNodeFile{substrate, 0}, nil
+	}
+	return &shardNodeFile{ctx, lsys, substrate, nil}, nil
+}
+
+// A StreamableByteNode is an ipld.Node that can be streamed over. It is guaranteed to have a Bytes type.
+type StreamableByteNode interface {
+	ipld.Node
+	io.Reader
+}
+
+type singleNodeFile struct {
+	ipld.Node
+	ptr int
+}
+
+func (f *singleNodeFile) Read(p []byte) (int, error) {
+	buf, err := f.Node.AsBytes()
+	if err != nil {
+		return 0, err
+	}
+	if f.ptr >= len(buf) {
+		return 0, io.EOF
+	}
+	n := copy(p, buf[f.ptr:])
+	f.ptr += n
+	return n, nil
+}
+
+type shardNodeFile struct {
+	ctx       context.Context
+	lsys      *ipld.LinkSystem
+	substrate ipld.Node
+	rdr       io.Reader
+}
+
+var _ ipld.Node = (*shardNodeFile)(nil)
+
+func (s *shardNodeFile) Read(p []byte) (int, error) {
+	// collect the sub-nodes on first use
+	if s.rdr == nil {
+		links, err := s.substrate.LookupByString("Links")
+		if err != nil {
+			return 0, err
+		}
+		readers := make([]io.Reader, 0)
+		lnki := links.ListIterator()
+		for !lnki.Done() {
+			_, lnk, err := lnki.Next()
+			if err != nil {
+				return 0, err
+			}
+			if pbl, ok := lnk.(dagpb.PBLink); ok {
+				target, err := s.lsys.Load(ipld.LinkContext{Ctx: s.ctx}, pbl.Hash.Link(), basicnode.Prototype.Any)
+				if err != nil {
+					return 0, err
+				}
+
+				asFSNode, err := NewUnixFSFile(s.ctx, target, s.lsys)
+				if err != nil {
+					return 0, err
+				}
+				readers = append(readers, asFSNode)
+			} else {
+				return 0, fmt.Errorf("unsupported link type: %T", lnk)
+			}
+		}
+		s.rdr = io.MultiReader(readers...)
+	}
+	return s.rdr.Read(p)
+}
+
+func (s *shardNodeFile) Kind() ipld.Kind {
+	return ipld.Kind_Bytes
+}
+
+func (s *shardNodeFile) AsBytes() ([]byte, error) {
+	return io.ReadAll(s)
+}
+
+func (s *shardNodeFile) AsBool() (bool, error) {
+	return false, ipld.ErrWrongKind{TypeName: "bool", MethodName: "AsBool", AppropriateKind: ipld.KindSet_JustBytes}
+}
+
+func (s *shardNodeFile) AsInt() (int64, error) {
+	return 0, ipld.ErrWrongKind{TypeName: "int", MethodName: "AsInt", AppropriateKind: ipld.KindSet_JustBytes}
+}
+
+func (s *shardNodeFile) AsFloat() (float64, error) {
+	return 0, ipld.ErrWrongKind{TypeName: "float", MethodName: "AsFloat", AppropriateKind: ipld.KindSet_JustBytes}
+}
+
+func (s *shardNodeFile) AsString() (string, error) {
+	return "", ipld.ErrWrongKind{TypeName: "string", MethodName: "AsString", AppropriateKind: ipld.KindSet_JustBytes}
+}
+
+func (s *shardNodeFile) AsLink() (ipld.Link, error) {
+	return nil, ipld.ErrWrongKind{TypeName: "link", MethodName: "AsLink", AppropriateKind: ipld.KindSet_JustBytes}
+}
+
+func (s *shardNodeFile) AsNode() (ipld.Node, error) {
+	return nil, nil
+}
+
+func (s *shardNodeFile) Size() int {
+	return 0
+}
+
+func (s *shardNodeFile) IsAbsent() bool {
+	return false
+}
+
+func (s *shardNodeFile) IsNull() bool {
+	return s.substrate.IsNull()
+}
+
+func (s *shardNodeFile) Length() int64 {
+	return 0
+}
+
+func (s *shardNodeFile) ListIterator() ipld.ListIterator {
+	return nil
+}
+
+func (s *shardNodeFile) MapIterator() ipld.MapIterator {
+	return nil
+}
+
+func (s *shardNodeFile) LookupByIndex(idx int64) (ipld.Node, error) {
+	return nil, ipld.ErrWrongKind{}
+}
+
+func (s *shardNodeFile) LookupByString(key string) (ipld.Node, error) {
+	return nil, ipld.ErrWrongKind{}
+}
+
+func (s *shardNodeFile) LookupByNode(key ipld.Node) (ipld.Node, error) {
+	return nil, ipld.ErrWrongKind{}
+}
+
+func (s *shardNodeFile) LookupBySegment(seg ipld.PathSegment) (ipld.Node, error) {
+	return nil, ipld.ErrWrongKind{}
+}
+
+func (s *shardNodeFile) Prototype() ipld.NodePrototype {
+	return basicnode.Prototype__Bytes{}
+}

From 83caffc771c6effd87cfe3ea28aa4488166d76de Mon Sep 17 00:00:00 2001
From: Will Scott <will.scott@protocol.ai>
Date: Tue, 2 Nov 2021 14:25:20 +0000
Subject: [PATCH 02/10] clean up references to shards on EOF

---
 file/file.go | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/file/file.go b/file/file.go
index 50e3a68..71adbd8 100644
--- a/file/file.go
+++ b/file/file.go
@@ -19,7 +19,7 @@ func NewUnixFSFile(ctx context.Context, substrate ipld.Node, lsys *ipld.LinkSyst
 		// A raw / single-node file.
 		return &singleNodeFile{substrate, 0}, nil
 	}
-	return &shardNodeFile{ctx, lsys, substrate, nil}, nil
+	return &shardNodeFile{ctx, lsys, substrate, false, nil}, nil
 }
 
 // A StreamableByteNode is an ipld.Node that can be streamed over. It is guaranteed to have a Bytes type.
@@ -50,12 +50,16 @@ type shardNodeFile struct {
 	ctx       context.Context
 	lsys      *ipld.LinkSystem
 	substrate ipld.Node
+	done      bool
 	rdr       io.Reader
 }
 
 var _ ipld.Node = (*shardNodeFile)(nil)
 
 func (s *shardNodeFile) Read(p []byte) (int, error) {
+	if s.done == true {
+		return 0, io.EOF
+	}
 	// collect the sub-nodes on first use
 	if s.rdr == nil {
 		links, err := s.substrate.LookupByString("Links")
@@ -86,7 +90,12 @@ func (s *shardNodeFile) Read(p []byte) (int, error) {
 		}
 		s.rdr = io.MultiReader(readers...)
 	}
-	return s.rdr.Read(p)
+	n, err := s.rdr.Read(p)
+	if err == io.EOF {
+		s.rdr = nil
+		s.done = true
+	}
+	return n, err
 }
 
 func (s *shardNodeFile) Kind() ipld.Kind {

From d3d3ac59561108cf5f3dcc273e7ca7e763435623 Mon Sep 17 00:00:00 2001
From: Will Scott <will.scott@protocol.ai>
Date: Tue, 2 Nov 2021 14:29:45 +0000
Subject: [PATCH 03/10] static check

---
 file/file.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/file/file.go b/file/file.go
index 71adbd8..28d7589 100644
--- a/file/file.go
+++ b/file/file.go
@@ -57,7 +57,7 @@ type shardNodeFile struct {
 var _ ipld.Node = (*shardNodeFile)(nil)
 
 func (s *shardNodeFile) Read(p []byte) (int, error) {
-	if s.done == true {
+	if s.done {
 		return 0, io.EOF
 	}
 	// collect the sub-nodes on first use

From 645e596ef109e3a3ae6a52dab950fd100b9db025 Mon Sep 17 00:00:00 2001
From: Will Scott <will.scott@protocol.ai>
Date: Tue, 2 Nov 2021 16:23:18 +0000
Subject: [PATCH 04/10] better proto choice

---
 file/file.go | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/file/file.go b/file/file.go
index 28d7589..d5cda1e 100644
--- a/file/file.go
+++ b/file/file.go
@@ -7,7 +7,9 @@ import (
 
 	dagpb "github.com/ipld/go-codec-dagpb"
 	"github.com/ipld/go-ipld-prime"
+	cidlink "github.com/ipld/go-ipld-prime/linking/cid"
 	basicnode "github.com/ipld/go-ipld-prime/node/basic"
+	"github.com/multiformats/go-multicodec"
 )
 
 // NewUnixFSFile attempts to construct an ipld node from the base protobuf node representing the
@@ -74,7 +76,7 @@ func (s *shardNodeFile) Read(p []byte) (int, error) {
 				return 0, err
 			}
 			if pbl, ok := lnk.(dagpb.PBLink); ok {
-				target, err := s.lsys.Load(ipld.LinkContext{Ctx: s.ctx}, pbl.Hash.Link(), basicnode.Prototype.Any)
+				target, err := s.lsys.Load(ipld.LinkContext{Ctx: s.ctx}, pbl.Hash.Link(), protoFor(pbl.Hash.Link()))
 				if err != nil {
 					return 0, err
 				}
@@ -98,6 +100,15 @@ func (s *shardNodeFile) Read(p []byte) (int, error) {
 	return n, err
 }
 
+func protoFor(link ipld.Link) ipld.NodePrototype {
+	if lc, ok := link.(cidlink.Link); ok {
+		if lc.Cid.Prefix().Codec == uint64(multicodec.DagPb) {
+			return dagpb.Type.PBNode
+		}
+	}
+	return basicnode.Prototype.Any
+}
+
 func (s *shardNodeFile) Kind() ipld.Kind {
 	return ipld.Kind_Bytes
 }
@@ -170,6 +181,7 @@ func (s *shardNodeFile) LookupBySegment(seg ipld.PathSegment) (ipld.Node, error)
 	return nil, ipld.ErrWrongKind{}
 }
 
+// shardded files / nodes look like dagpb nodes.
 func (s *shardNodeFile) Prototype() ipld.NodePrototype {
-	return basicnode.Prototype__Bytes{}
+	return dagpb.Type.PBNode
 }

From 418dba48a13fe778d4afc61e9e07c18d6578d359 Mon Sep 17 00:00:00 2001
From: Will Scott <will.scott@protocol.ai>
Date: Wed, 3 Nov 2021 11:30:15 +0000
Subject: [PATCH 05/10] Add roundtrip file test.

---
 data/builder/file_test.go | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/data/builder/file_test.go b/data/builder/file_test.go
index 9fbe8e0..5861979 100644
--- a/data/builder/file_test.go
+++ b/data/builder/file_test.go
@@ -2,10 +2,14 @@ package builder
 
 import (
 	"bytes"
+	"context"
+	"io"
 	"testing"
 
 	"github.com/ipfs/go-cid"
 	u "github.com/ipfs/go-ipfs-util"
+	"github.com/ipfs/go-unixfsnode/file"
+	dagpb "github.com/ipld/go-codec-dagpb"
 	"github.com/ipld/go-ipld-prime"
 	cidlink "github.com/ipld/go-ipld-prime/linking/cid"
 )
@@ -39,3 +43,38 @@ func TestBuildUnixFSFile(t *testing.T) {
 		t.Fatal("expected top of file to be in store.")
 	}
 }
+
+func TestUnixFSFileRoundtrip(t *testing.T) {
+	buf := make([]byte, 10*1024*1024)
+	u.NewSeededRand(0xdeadbeef).Read(buf)
+	r := bytes.NewReader(buf)
+
+	ls := cidlink.DefaultLinkSystem()
+	storage := cidlink.Memory{}
+	ls.StorageReadOpener = storage.OpenRead
+	ls.StorageWriteOpener = storage.OpenWrite
+
+	f, _, err := BuildUnixFSFile(r, "", &ls)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	// get back the root node substrate from the link at the top of the builder.
+	fr, err := ls.Load(ipld.LinkContext{}, f, dagpb.Type.PBNode)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	ufn, err := file.NewUnixFSFile(context.Background(), fr, &ls)
+	if err != nil {
+		t.Fatal(err)
+	}
+	// read back out the file.
+	out, err := io.ReadAll(ufn)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !bytes.Equal(out, buf) {
+		t.Fatal("Not equal")
+	}
+}

From c58e31c278ad37485241ca6be22e0d7d18a575d0 Mon Sep 17 00:00:00 2001
From: Will Scott <will.scott@protocol.ai>
Date: Wed, 3 Nov 2021 11:35:25 +0000
Subject: [PATCH 06/10] add file adl to reifier

---
 reification.go | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/reification.go b/reification.go
index 9a0244c..fc79291 100644
--- a/reification.go
+++ b/reification.go
@@ -6,6 +6,7 @@ import (
 
 	"github.com/ipfs/go-unixfsnode/data"
 	"github.com/ipfs/go-unixfsnode/directory"
+	"github.com/ipfs/go-unixfsnode/file"
 	"github.com/ipfs/go-unixfsnode/hamt"
 	dagpb "github.com/ipld/go-codec-dagpb"
 	"github.com/ipld/go-ipld-prime"
@@ -37,9 +38,9 @@ func Reify(lnkCtx ipld.LinkContext, maybePBNodeRoot ipld.Node, lsys *ipld.LinkSy
 type reifyTypeFunc func(context.Context, dagpb.PBNode, data.UnixFSData, *ipld.LinkSystem) (ipld.Node, error)
 
 var reifyFuncs = map[int64]reifyTypeFunc{
-	data.Data_File:      defaultUnixFSReifier,
+	data.Data_File:      unixFSFileReifier,
 	data.Data_Metadata:  defaultUnixFSReifier,
-	data.Data_Raw:       defaultUnixFSReifier,
+	data.Data_Raw:       unixFSFileReifier,
 	data.Data_Symlink:   defaultUnixFSReifier,
 	data.Data_Directory: directory.NewUnixFSBasicDir,
 	data.Data_HAMTShard: hamt.NewUnixFSHAMTShard,
@@ -51,6 +52,10 @@ func defaultReifier(_ context.Context, substrate dagpb.PBNode, _ *ipld.LinkSyste
 	return &_PathedPBNode{_substrate: substrate}, nil
 }
 
+func unixFSFileReifier(ctx context.Context, substrate dagpb.PBNode, _ data.UnixFSData, ls *ipld.LinkSystem) (ipld.Node, error) {
+	return file.NewUnixFSFile(ctx, substrate, ls)
+}
+
 func defaultUnixFSReifier(ctx context.Context, substrate dagpb.PBNode, _ data.UnixFSData, ls *ipld.LinkSystem) (ipld.Node, error) {
 	return defaultReifier(ctx, substrate, ls)
 }

From 3a20c7939601fd597307d4778e17f34686196ed8 Mon Sep 17 00:00:00 2001
From: Will Scott <will.scott@protocol.ai>
Date: Wed, 3 Nov 2021 12:34:41 +0000
Subject: [PATCH 07/10] support v0 cid leafs

---
 file/file.go    | 154 ++++--------------------------------------------
 file/shard.go   | 151 +++++++++++++++++++++++++++++++++++++++++++++++
 file/wrapped.go |  36 +++++++++++
 3 files changed, 198 insertions(+), 143 deletions(-)
 create mode 100644 file/shard.go
 create mode 100644 file/wrapped.go

diff --git a/file/file.go b/file/file.go
index d5cda1e..0606bbb 100644
--- a/file/file.go
+++ b/file/file.go
@@ -2,14 +2,9 @@ package file
 
 import (
 	"context"
-	"fmt"
 	"io"
 
-	dagpb "github.com/ipld/go-codec-dagpb"
 	"github.com/ipld/go-ipld-prime"
-	cidlink "github.com/ipld/go-ipld-prime/linking/cid"
-	basicnode "github.com/ipld/go-ipld-prime/node/basic"
-	"github.com/multiformats/go-multicodec"
 )
 
 // NewUnixFSFile attempts to construct an ipld node from the base protobuf node representing the
@@ -21,6 +16,17 @@ func NewUnixFSFile(ctx context.Context, substrate ipld.Node, lsys *ipld.LinkSyst
 		// A raw / single-node file.
 		return &singleNodeFile{substrate, 0}, nil
 	}
+	// see if it's got children.
+	links, err := substrate.LookupByString("Links")
+	if err != nil {
+		return nil, err
+	}
+	lli := links.ListIterator()
+	if lli.Done() {
+		// no children.
+		return newWrappedNode(substrate)
+	}
+
 	return &shardNodeFile{ctx, lsys, substrate, false, nil}, nil
 }
 
@@ -47,141 +53,3 @@ func (f *singleNodeFile) Read(p []byte) (int, error) {
 	f.ptr += n
 	return n, nil
 }
-
-type shardNodeFile struct {
-	ctx       context.Context
-	lsys      *ipld.LinkSystem
-	substrate ipld.Node
-	done      bool
-	rdr       io.Reader
-}
-
-var _ ipld.Node = (*shardNodeFile)(nil)
-
-func (s *shardNodeFile) Read(p []byte) (int, error) {
-	if s.done {
-		return 0, io.EOF
-	}
-	// collect the sub-nodes on first use
-	if s.rdr == nil {
-		links, err := s.substrate.LookupByString("Links")
-		if err != nil {
-			return 0, err
-		}
-		readers := make([]io.Reader, 0)
-		lnki := links.ListIterator()
-		for !lnki.Done() {
-			_, lnk, err := lnki.Next()
-			if err != nil {
-				return 0, err
-			}
-			if pbl, ok := lnk.(dagpb.PBLink); ok {
-				target, err := s.lsys.Load(ipld.LinkContext{Ctx: s.ctx}, pbl.Hash.Link(), protoFor(pbl.Hash.Link()))
-				if err != nil {
-					return 0, err
-				}
-
-				asFSNode, err := NewUnixFSFile(s.ctx, target, s.lsys)
-				if err != nil {
-					return 0, err
-				}
-				readers = append(readers, asFSNode)
-			} else {
-				return 0, fmt.Errorf("unsupported link type: %T", lnk)
-			}
-		}
-		s.rdr = io.MultiReader(readers...)
-	}
-	n, err := s.rdr.Read(p)
-	if err == io.EOF {
-		s.rdr = nil
-		s.done = true
-	}
-	return n, err
-}
-
-func protoFor(link ipld.Link) ipld.NodePrototype {
-	if lc, ok := link.(cidlink.Link); ok {
-		if lc.Cid.Prefix().Codec == uint64(multicodec.DagPb) {
-			return dagpb.Type.PBNode
-		}
-	}
-	return basicnode.Prototype.Any
-}
-
-func (s *shardNodeFile) Kind() ipld.Kind {
-	return ipld.Kind_Bytes
-}
-
-func (s *shardNodeFile) AsBytes() ([]byte, error) {
-	return io.ReadAll(s)
-}
-
-func (s *shardNodeFile) AsBool() (bool, error) {
-	return false, ipld.ErrWrongKind{TypeName: "bool", MethodName: "AsBool", AppropriateKind: ipld.KindSet_JustBytes}
-}
-
-func (s *shardNodeFile) AsInt() (int64, error) {
-	return 0, ipld.ErrWrongKind{TypeName: "int", MethodName: "AsInt", AppropriateKind: ipld.KindSet_JustBytes}
-}
-
-func (s *shardNodeFile) AsFloat() (float64, error) {
-	return 0, ipld.ErrWrongKind{TypeName: "float", MethodName: "AsFloat", AppropriateKind: ipld.KindSet_JustBytes}
-}
-
-func (s *shardNodeFile) AsString() (string, error) {
-	return "", ipld.ErrWrongKind{TypeName: "string", MethodName: "AsString", AppropriateKind: ipld.KindSet_JustBytes}
-}
-
-func (s *shardNodeFile) AsLink() (ipld.Link, error) {
-	return nil, ipld.ErrWrongKind{TypeName: "link", MethodName: "AsLink", AppropriateKind: ipld.KindSet_JustBytes}
-}
-
-func (s *shardNodeFile) AsNode() (ipld.Node, error) {
-	return nil, nil
-}
-
-func (s *shardNodeFile) Size() int {
-	return 0
-}
-
-func (s *shardNodeFile) IsAbsent() bool {
-	return false
-}
-
-func (s *shardNodeFile) IsNull() bool {
-	return s.substrate.IsNull()
-}
-
-func (s *shardNodeFile) Length() int64 {
-	return 0
-}
-
-func (s *shardNodeFile) ListIterator() ipld.ListIterator {
-	return nil
-}
-
-func (s *shardNodeFile) MapIterator() ipld.MapIterator {
-	return nil
-}
-
-func (s *shardNodeFile) LookupByIndex(idx int64) (ipld.Node, error) {
-	return nil, ipld.ErrWrongKind{}
-}
-
-func (s *shardNodeFile) LookupByString(key string) (ipld.Node, error) {
-	return nil, ipld.ErrWrongKind{}
-}
-
-func (s *shardNodeFile) LookupByNode(key ipld.Node) (ipld.Node, error) {
-	return nil, ipld.ErrWrongKind{}
-}
-
-func (s *shardNodeFile) LookupBySegment(seg ipld.PathSegment) (ipld.Node, error) {
-	return nil, ipld.ErrWrongKind{}
-}
-
-// shardded files / nodes look like dagpb nodes.
-func (s *shardNodeFile) Prototype() ipld.NodePrototype {
-	return dagpb.Type.PBNode
-}
diff --git a/file/shard.go b/file/shard.go
new file mode 100644
index 0000000..e7d2636
--- /dev/null
+++ b/file/shard.go
@@ -0,0 +1,151 @@
+package file
+
+import (
+	"context"
+	"fmt"
+	"io"
+
+	dagpb "github.com/ipld/go-codec-dagpb"
+	"github.com/ipld/go-ipld-prime"
+	cidlink "github.com/ipld/go-ipld-prime/linking/cid"
+	"github.com/ipld/go-ipld-prime/node/basicnode"
+	"github.com/multiformats/go-multicodec"
+)
+
+type shardNodeFile struct {
+	ctx       context.Context
+	lsys      *ipld.LinkSystem
+	substrate ipld.Node
+	done      bool
+	rdr       io.Reader
+}
+
+var _ ipld.Node = (*shardNodeFile)(nil)
+
+func (s *shardNodeFile) Read(p []byte) (int, error) {
+	if s.done {
+		return 0, io.EOF
+	}
+	// collect the sub-nodes on first use
+	if s.rdr == nil {
+		links, err := s.substrate.LookupByString("Links")
+		if err != nil {
+			return 0, err
+		}
+		readers := make([]io.Reader, 0)
+		lnki := links.ListIterator()
+		for !lnki.Done() {
+			_, lnk, err := lnki.Next()
+			if err != nil {
+				return 0, err
+			}
+			if pbl, ok := lnk.(dagpb.PBLink); ok {
+				target, err := s.lsys.Load(ipld.LinkContext{Ctx: s.ctx}, pbl.Hash.Link(), protoFor(pbl.Hash.Link()))
+				if err != nil {
+					return 0, err
+				}
+
+				asFSNode, err := NewUnixFSFile(s.ctx, target, s.lsys)
+				if err != nil {
+					return 0, err
+				}
+				readers = append(readers, asFSNode)
+			} else {
+				return 0, fmt.Errorf("unsupported link type: %T", lnk)
+			}
+		}
+		s.rdr = io.MultiReader(readers...)
+	}
+	n, err := s.rdr.Read(p)
+	if err == io.EOF {
+		s.rdr = nil
+		s.done = true
+	}
+	return n, err
+}
+
+func protoFor(link ipld.Link) ipld.NodePrototype {
+	if lc, ok := link.(cidlink.Link); ok {
+		if lc.Cid.Prefix().Codec == uint64(multicodec.DagPb) {
+			return dagpb.Type.PBNode
+		}
+	}
+	return basicnode.Prototype.Any
+}
+
+func (s *shardNodeFile) Kind() ipld.Kind {
+	return ipld.Kind_Bytes
+}
+
+func (s *shardNodeFile) AsBytes() ([]byte, error) {
+	return io.ReadAll(s)
+}
+
+func (s *shardNodeFile) AsBool() (bool, error) {
+	return false, ipld.ErrWrongKind{TypeName: "bool", MethodName: "AsBool", AppropriateKind: ipld.KindSet_JustBytes}
+}
+
+func (s *shardNodeFile) AsInt() (int64, error) {
+	return 0, ipld.ErrWrongKind{TypeName: "int", MethodName: "AsInt", AppropriateKind: ipld.KindSet_JustBytes}
+}
+
+func (s *shardNodeFile) AsFloat() (float64, error) {
+	return 0, ipld.ErrWrongKind{TypeName: "float", MethodName: "AsFloat", AppropriateKind: ipld.KindSet_JustBytes}
+}
+
+func (s *shardNodeFile) AsString() (string, error) {
+	return "", ipld.ErrWrongKind{TypeName: "string", MethodName: "AsString", AppropriateKind: ipld.KindSet_JustBytes}
+}
+
+func (s *shardNodeFile) AsLink() (ipld.Link, error) {
+	return nil, ipld.ErrWrongKind{TypeName: "link", MethodName: "AsLink", AppropriateKind: ipld.KindSet_JustBytes}
+}
+
+func (s *shardNodeFile) AsNode() (ipld.Node, error) {
+	return nil, nil
+}
+
+func (s *shardNodeFile) Size() int {
+	return 0
+}
+
+func (s *shardNodeFile) IsAbsent() bool {
+	return false
+}
+
+func (s *shardNodeFile) IsNull() bool {
+	return s.substrate.IsNull()
+}
+
+func (s *shardNodeFile) Length() int64 {
+	return 0
+}
+
+func (s *shardNodeFile) ListIterator() ipld.ListIterator {
+	return nil
+}
+
+func (s *shardNodeFile) MapIterator() ipld.MapIterator {
+	return nil
+}
+
+func (s *shardNodeFile) LookupByIndex(idx int64) (ipld.Node, error) {
+	return nil, ipld.ErrWrongKind{}
+}
+
+func (s *shardNodeFile) LookupByString(key string) (ipld.Node, error) {
+	return nil, ipld.ErrWrongKind{}
+}
+
+func (s *shardNodeFile) LookupByNode(key ipld.Node) (ipld.Node, error) {
+	return nil, ipld.ErrWrongKind{}
+}
+
+func (s *shardNodeFile) LookupBySegment(seg ipld.PathSegment) (ipld.Node, error) {
+	return nil, ipld.ErrWrongKind{}
+}
+
+// shardded files / nodes look like dagpb nodes.
+func (s *shardNodeFile) Prototype() ipld.NodePrototype {
+	return dagpb.Type.PBNode
+}
diff --git a/file/wrapped.go b/file/wrapped.go
new file mode 100644
index 0000000..0f558f7
--- /dev/null
+++ b/file/wrapped.go
@@ -0,0 +1,36 @@
+package file
+
+import (
+	"github.com/ipfs/go-unixfsnode/data"
+	"github.com/ipld/go-ipld-prime"
+	"github.com/ipld/go-ipld-prime/node/basicnode"
+)
+
+func newWrappedNode(substrate ipld.Node) (StreamableByteNode, error) {
+	dataField, err := substrate.LookupByString("Data")
+	if err != nil {
+		return nil, err
+	}
+	// unpack as unixfs proto.
+	dfb, err := dataField.AsBytes()
+	if err != nil {
+		return nil, err
+	}
+	ufd, err := data.DecodeUnixFSData(dfb)
+	if err != nil {
+		return nil, err
+	}
+
+	if ufd.Data.Exists() {
+		return &singleNodeFile{
+			Node: ufd.Data.Must(),
+			ptr:  0,
+		}, nil
+	}
+
+	// an empty degenerate one.
+	return &singleNodeFile{
+		Node: basicnode.NewBytes(nil),
+		ptr:  0,
+	}, nil
+}

From 08c24e26a8ed18a794d659ea2f95009c1caa84e8 Mon Sep 17 00:00:00 2001
From: Will Scott <will.scott@protocol.ai>
Date: Thu, 4 Nov 2021 16:47:28 +0000
Subject: [PATCH 08/10] add fixtures / tests for v0 files

---
 file/file_test.go                             |  85 +++++
 ...BmuS4z925WZfrqQ1qHaJ56DQaTfyMUF7F8ff5o.car | Bin 0 -> 112 bytes
 ...Jq63SkDZ1mWLbWWyVV66PuqyHWpKkH4pcVyY4H.car | Bin 0 -> 198 bytes
 go.mod                                        |  12 +-
 go.sum                                        | 353 +++++++++++++++++-
 5 files changed, 438 insertions(+), 12 deletions(-)
 create mode 100644 file/file_test.go
 create mode 100644 file/fixtures/QmT78zSuBmuS4z925WZfrqQ1qHaJ56DQaTfyMUF7F8ff5o.car
 create mode 100644 file/fixtures/QmT8EC9sJq63SkDZ1mWLbWWyVV66PuqyHWpKkH4pcVyY4H.car

diff --git a/file/file_test.go b/file/file_test.go
new file mode 100644
index 0000000..86aefa6
--- /dev/null
+++ b/file/file_test.go
@@ -0,0 +1,85 @@
+package file_test
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+	"io"
+	"testing"
+
+	"github.com/ipfs/go-unixfsnode"
+	"github.com/ipfs/go-unixfsnode/directory"
+	"github.com/ipfs/go-unixfsnode/file"
+	"github.com/ipld/go-car/v2/blockstore"
+	dagpb "github.com/ipld/go-codec-dagpb"
+	"github.com/ipld/go-ipld-prime"
+	cidlink "github.com/ipld/go-ipld-prime/linking/cid"
+)
+
+func TestRootV0File(t *testing.T) {
+	baseFile := "./fixtures/QmT78zSuBmuS4z925WZfrqQ1qHaJ56DQaTfyMUF7F8ff5o.car"
+	root, ls := open(baseFile, t)
+	file, err := file.NewUnixFSFile(context.Background(), root, ls)
+	if err != nil {
+		t.Fatal(err)
+	}
+	fc, err := file.AsBytes()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !bytes.Equal(fc, []byte("hello world\n")) {
+		t.Errorf("file content does not match: %s", string(fc))
+	}
+}
+
+func TestNamedV0File(t *testing.T) {
+	baseFile := "./fixtures/QmT8EC9sJq63SkDZ1mWLbWWyVV66PuqyHWpKkH4pcVyY4H.car"
+	root, ls := open(baseFile, t)
+	dir, err := unixfsnode.Reify(ipld.LinkContext{}, root, ls)
+	if err != nil {
+		t.Fatal(err)
+	}
+	dpbn := dir.(directory.UnixFSBasicDir)
+	name, link := dpbn.Iterator().Next()
+	fmt.Printf("%s\n", name)
+	fileNode, err := ls.Load(ipld.LinkContext{}, link.Link(), dagpb.Type.PBNode)
+	file, err := file.NewUnixFSFile(context.Background(), fileNode, ls)
+	if err != nil {
+		t.Fatal(err)
+	}
+	fc, err := file.AsBytes()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !bytes.Equal(fc, []byte("hello world\n")) {
+		t.Errorf("file content does not match: %s", string(fc))
+	}
+}
+
+func open(car string, t *testing.T) (ipld.Node, *ipld.LinkSystem) {
+	baseStore, err := blockstore.OpenReadOnly(car)
+	if err != nil {
+		t.Fatal(err)
+	}
+	ls := cidlink.DefaultLinkSystem()
+	ls.StorageReadOpener = func(_ ipld.LinkContext, l ipld.Link) (io.Reader, error) {
+		cl, ok := l.(cidlink.Link)
+		if !ok {
+			return nil, fmt.Errorf("couldn't load link")
+		}
+		blk, err := baseStore.Get(cl.Cid)
+		if err != nil {
+			return nil, err
+		}
+		return bytes.NewBuffer(blk.RawData()), nil
+	}
+	carRoots, err := baseStore.Roots()
+	if err != nil {
+		t.Fatal(err)
+	}
+	root, err := ls.Load(ipld.LinkContext{}, cidlink.Link{Cid: carRoots[0]}, dagpb.Type.PBNode)
+	if err != nil {
+		t.Fatal(err)
+	}
+	return root, &ls
+}
diff --git a/file/fixtures/QmT78zSuBmuS4z925WZfrqQ1qHaJ56DQaTfyMUF7F8ff5o.car b/file/fixtures/QmT78zSuBmuS4z925WZfrqQ1qHaJ56DQaTfyMUF7F8ff5o.car
new file mode 100644
index 0000000000000000000000000000000000000000..7ec9782d889283aaa9fc83e6584aa1abee5e6788
GIT binary patch
literal 112
zcmcCmlv<RZUsBw7Ln}g=K}f;viigO~qw7UvtX6G55PS56%d4wD<%L?indEl4mUa8^
lrI)1^6=&w>F`5xp%O%9YB*c@Env;{SP@Z3ulfosz0{~YCEGYm0

literal 0
HcmV?d00001

diff --git a/file/fixtures/QmT8EC9sJq63SkDZ1mWLbWWyVV66PuqyHWpKkH4pcVyY4H.car b/file/fixtures/QmT8EC9sJq63SkDZ1mWLbWWyVV66PuqyHWpKkH4pcVyY4H.car
new file mode 100644
index 0000000000000000000000000000000000000000..88b4a08ebe13cf9f5c9c8d688789945a36c6f313
GIT binary patch
literal 198
zcmcCmlv<RZUsBw7Ln}g=K}f+}dSC6?dxw`7<wZrWe*J#arKLNMO-Nr>(-Hr6pN0Ch
zUFl`1Ma7x<d5oci)e7lyDG4dKUGWgvd33#qjMb{`2V#%DaCvq0r@T;WH<R2h*RpOO
pJ|Wg5y^@L&2@x(P4n{M=>bZnCn1pyTQgd?h70UCAa#FY?cmOuMRj~j7

literal 0
HcmV?d00001

diff --git a/go.mod b/go.mod
index 945954a..fba9ffc 100644
--- a/go.mod
+++ b/go.mod
@@ -5,25 +5,19 @@ go 1.16
 require (
 	github.com/Stebalien/go-bitfield v0.0.1
 	github.com/ipfs/go-bitfield v1.0.0
-	github.com/ipfs/go-block-format v0.0.3 // indirect
 	github.com/ipfs/go-cid v0.1.0
-	github.com/ipfs/go-ipfs-blockstore v1.0.3 // indirect
+	github.com/ipfs/go-datastore v0.4.6 // indirect
 	github.com/ipfs/go-ipfs-chunker v0.0.1
 	github.com/ipfs/go-ipfs-util v0.0.2
-	github.com/ipfs/go-ipld-cbor v0.0.5 // indirect
 	github.com/ipfs/go-ipld-format v0.2.0
 	github.com/ipfs/go-merkledag v0.3.2
 	github.com/ipfs/go-unixfs v0.2.4
+	github.com/ipld/go-car/v2 v2.1.0
 	github.com/ipld/go-codec-dagpb v1.3.0
 	github.com/ipld/go-ipld-prime v0.12.4-0.20211014180653-3ba656a3bc6b
-	github.com/mattn/go-colorable v0.1.8 // indirect
-	github.com/multiformats/go-multicodec v0.3.0
+	github.com/multiformats/go-multicodec v0.3.1-0.20210902112759-1539a079fd61
 	github.com/multiformats/go-multihash v0.0.17-0.20211012170226-654b06d7912a
 	github.com/spaolacci/murmur3 v1.1.0
 	github.com/stretchr/testify v1.7.0
-	go.uber.org/atomic v1.7.0 // indirect
-	golang.org/x/crypto v0.0.0-20210711020723-a769d52b0f97 // indirect
-	golang.org/x/sys v0.0.0-20210630005230-0f9fa26af87c // indirect
-	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
 	google.golang.org/protobuf v1.27.1
 )
diff --git a/go.sum b/go.sum
index 1e56aad..8933f4f 100644
--- a/go.sum
+++ b/go.sum
@@ -1,8 +1,35 @@
+cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+dmitri.shuralyov.com/gpu/mtl v0.0.0-20201218220906-28db891af037/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
 github.com/AndreasBriese/bbloom v0.0.0-20180913140656-343706a395b7/go.mod h1:bOvUY6CB00SOBii9/FifXqc0awNKxLFCL/+pkDPuyl8=
+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
+github.com/Knetic/govaluate v3.0.1-0.20171022003610-9aa49832a739+incompatible/go.mod h1:r7JcOSlj0wfOMncg0iLm8Leh48TZaKVeNIfJntJ2wa0=
 github.com/Kubuxu/go-os-helper v0.0.1/go.mod h1:N8B+I7vPCT80IcP58r50u4+gEEcsZETFUpAzWW2ep1Y=
+github.com/Shopify/sarama v1.19.0/go.mod h1:FVkBWblsNy7DGZRfXLU0O9RCGt5g3g3yEuWXgklEdEo=
+github.com/Shopify/toxiproxy v2.1.4+incompatible/go.mod h1:OXgGpZ6Cli1/URJOF1DMxUHB2q5Ap20/P/eIdh4G0pI=
 github.com/Stebalien/go-bitfield v0.0.1 h1:X3kbSSPUaJK60wV2hjOPZwmpljr6VGCqdq4cBLhbQBo=
 github.com/Stebalien/go-bitfield v0.0.1/go.mod h1:GNjFpasyUVkHMsfEOk8EFLJ9syQ6SI+XWrX9Wf2XH0s=
+github.com/VividCortex/gohistogram v1.0.0/go.mod h1:Pf5mBqqDxYaXu3hDrrU+w6nw50o/4+TcAqDqk/vUH7g=
 github.com/aead/siphash v1.0.1/go.mod h1:Nywa3cDsYNNK3gaciGTWPwHt0wlpNV15vwmswBAUSII=
+github.com/afex/hystrix-go v0.0.0-20180502004556-fa1af6a1f4f5/go.mod h1:SkGFH1ia65gfNATL8TAiHDNxPzPdmEL5uirI2Uyuz6c=
+github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
+github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
+github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
+github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
+github.com/apache/thrift v0.12.0/go.mod h1:cp2SuWMxlEZw2r+iP2GNCdIi4C1qmUzdZFSVb+bacwQ=
+github.com/apache/thrift v0.13.0/go.mod h1:cp2SuWMxlEZw2r+iP2GNCdIi4C1qmUzdZFSVb+bacwQ=
+github.com/armon/circbuf v0.0.0-20150827004946-bbbad097214e/go.mod h1:3U/XgcO3hCbHZ8TKRvWD2dDTCfh9M9ya+I9JpbB7O8o=
+github.com/armon/go-metrics v0.0.0-20180917152333-f0300d1749da/go.mod h1:Q73ZrmVTwzkszR9V5SSuryQ31EELlFMUz1kKyl939pY=
+github.com/armon/go-radix v0.0.0-20180808171621-7fddfc383310/go.mod h1:ufUuZ+zHj4x4TnLV4JWEpy2hxWSpsRywHrMgIH9cCH8=
+github.com/aryann/difflib v0.0.0-20170710044230-e206f873d14a/go.mod h1:DAHtR1m6lCRdSC2Tm3DSWRPvIPr6xNKyeHdqDQSQT+A=
+github.com/aws/aws-lambda-go v1.13.3/go.mod h1:4UKl9IzQMoD+QF79YdCuzCwp8VbmG4VAQwij/eHl5CU=
+github.com/aws/aws-sdk-go v1.27.0/go.mod h1:KmX6BPdI08NWTb3/sm4ZGu5ShLoqVDhKgpiN924inxo=
+github.com/aws/aws-sdk-go-v2 v0.18.0/go.mod h1:JWVYvqSMppoMJC0x5wdwiImzgXTI9FuZwxzkQq9wy+g=
+github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
+github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
+github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
+github.com/bgentry/speakeasy v0.1.0/go.mod h1:+zsyZBPWlz7T6j88CTgSN5bM796AkVf0kBD4zp0CCIs=
 github.com/btcsuite/btcd v0.0.0-20190213025234-306aecffea32/go.mod h1:DrZx5ec/dmnfpw9KyYoQyYo7d0KEvTkk/5M/vbZjAr8=
 github.com/btcsuite/btcd v0.0.0-20190523000118-16327141da8c/go.mod h1:3J08xEfcugPacsc34/LKRU2yO7YmuT8yt28J8k2+rrI=
 github.com/btcsuite/btcd v0.0.0-20190605094302-a0d1e3e36d50 h1:4i3KsuVA0o0KoBxAC5x+MY7RbteiMK1V7gf/G08NGIQ=
@@ -15,8 +42,22 @@ github.com/btcsuite/goleveldb v0.0.0-20160330041536-7834afc9e8cd/go.mod h1:F+uVa
 github.com/btcsuite/snappy-go v0.0.0-20151229074030-0bdef8d06723/go.mod h1:8woku9dyThutzjeg+3xrA5iCpBRH8XEEg3lh6TiUghc=
 github.com/btcsuite/websocket v0.0.0-20150119174127-31079b680792/go.mod h1:ghJtEyQwv5/p4Mg4C0fgbePVuGr935/5ddU9Z3TmDRY=
 github.com/btcsuite/winsvc v1.0.0/go.mod h1:jsenWakMcC0zFBFurPLEAyrnc/teJEM1O46fmI40EZs=
+github.com/casbin/casbin/v2 v2.1.2/go.mod h1:YcPU1XXisHhLzuxH9coDNf2FbKpjGlbCg3n9yuLkIJQ=
+github.com/cenkalti/backoff v2.2.1+incompatible/go.mod h1:90ReRw6GdpyfrHakVjL/QHaoyV4aDUVVkXQJJJ3NXXM=
+github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
+github.com/cespare/xxhash/v2 v2.1.1/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
+github.com/clbanning/x2j v0.0.0-20191024224557-825249438eec/go.mod h1:jMjuTZXRI4dUb/I5gc9Hdhagfvm9+RyrPryS/auMzxE=
+github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
+github.com/cockroachdb/datadriven v0.0.0-20190809214429-80d97fb3cbaa/go.mod h1:zn76sxSg3SzpJ0PPJaLDCu+Bu0Lg3sKTORVIj19EIF8=
+github.com/codahale/hdrhistogram v0.0.0-20161010025455-3a0bb77429bd/go.mod h1:sE/e/2PUdi/liOCUjSTXgM1o87ZssimdTWN964YiIeI=
+github.com/coreos/go-semver v0.2.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=
 github.com/coreos/go-semver v0.3.0 h1:wkHLiw0WNATZnSG7epLsujiMCgPAc9xhjJ4tgnAxmfM=
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@@ -77,6 +186,7 @@ github.com/ipfs/go-cid v0.0.3/go.mod h1:GHWU/WuQdMPmIosc4Yn1bcCT7dSeX4lBafM7iqUP
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@@ -84,8 +194,10 @@ github.com/ipfs/go-datastore v0.0.5/go.mod h1:d4KVXhMt913cLBEI/PXAy6ko+W7e9AhyAK
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From 6bb90b30f99f6545972ee7c73ed210436192cfdc Mon Sep 17 00:00:00 2001
From: Will Scott <will.scott@protocol.ai>
Date: Thu, 4 Nov 2021 16:51:20 +0000
Subject: [PATCH 09/10] fix static issue

---
 file/file_test.go | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/file/file_test.go b/file/file_test.go
index 86aefa6..17d221f 100644
--- a/file/file_test.go
+++ b/file/file_test.go
@@ -41,8 +41,13 @@ func TestNamedV0File(t *testing.T) {
 	}
 	dpbn := dir.(directory.UnixFSBasicDir)
 	name, link := dpbn.Iterator().Next()
-	fmt.Printf("%s\n", name)
+	if name.String() != "b.txt" {
+		t.Fatal("unexpected filename")
+	}
 	fileNode, err := ls.Load(ipld.LinkContext{}, link.Link(), dagpb.Type.PBNode)
+	if err != nil {
+		t.Fatal(err)
+	}
 	file, err := file.NewUnixFSFile(context.Background(), fileNode, ls)
 	if err != nil {
 		t.Fatal(err)

From 332b6d71a8df38dabcf94e1bd3ccb801e6ddebd2 Mon Sep 17 00:00:00 2001
From: Will Scott <will.scott@protocol.ai>
Date: Thu, 4 Nov 2021 18:45:18 +0000
Subject: [PATCH 10/10] address code review suggestions

---
 file/file.go    | 18 +++++++++++-------
 file/shard.go   | 31 +++++++++++++++++--------------
 file/wrapped.go |  2 --
 3 files changed, 28 insertions(+), 23 deletions(-)

diff --git a/file/file.go b/file/file.go
index 0606bbb..bda6f9e 100644
--- a/file/file.go
+++ b/file/file.go
@@ -21,13 +21,17 @@ func NewUnixFSFile(ctx context.Context, substrate ipld.Node, lsys *ipld.LinkSyst
 	if err != nil {
 		return nil, err
 	}
-	lli := links.ListIterator()
-	if lli.Done() {
+	if links.Length() == 0 {
 		// no children.
 		return newWrappedNode(substrate)
 	}
 
-	return &shardNodeFile{ctx, lsys, substrate, false, nil}, nil
+	return &shardNodeFile{
+		ctx:       ctx,
+		lsys:      lsys,
+		substrate: substrate,
+		done:      false,
+		rdr:       nil}, nil
 }
 
 // A StreamableByteNode is an ipld.Node that can be streamed over. It is guaranteed to have a Bytes type.
@@ -38,7 +42,7 @@ type StreamableByteNode interface {
 
 type singleNodeFile struct {
 	ipld.Node
-	ptr int
+	offset int
 }
 
 func (f *singleNodeFile) Read(p []byte) (int, error) {
@@ -46,10 +50,10 @@ func (f *singleNodeFile) Read(p []byte) (int, error) {
 	if err != nil {
 		return 0, err
 	}
-	if f.ptr >= len(buf) {
+	if f.offset >= len(buf) {
 		return 0, io.EOF
 	}
-	n := copy(p, buf[f.ptr:])
-	f.ptr += n
+	n := copy(p, buf[f.offset:])
+	f.offset += n
 	return n, nil
 }
diff --git a/file/shard.go b/file/shard.go
index e7d2636..303054f 100644
--- a/file/shard.go
+++ b/file/shard.go
@@ -2,7 +2,6 @@ package file
 
 import (
 	"context"
-	"fmt"
 	"io"
 
 	dagpb "github.com/ipld/go-codec-dagpb"
@@ -39,20 +38,24 @@ func (s *shardNodeFile) Read(p []byte) (int, error) {
 			if err != nil {
 				return 0, err
 			}
-			if pbl, ok := lnk.(dagpb.PBLink); ok {
-				target, err := s.lsys.Load(ipld.LinkContext{Ctx: s.ctx}, pbl.Hash.Link(), protoFor(pbl.Hash.Link()))
-				if err != nil {
-					return 0, err
-				}
-
-				asFSNode, err := NewUnixFSFile(s.ctx, target, s.lsys)
-				if err != nil {
-					return 0, err
-				}
-				readers = append(readers, asFSNode)
-			} else {
-				return 0, fmt.Errorf("unsupported link type: %T", lnk)
+			lnkhash, err := lnk.LookupByString("Hash")
+			if err != nil {
+				return 0, err
+			}
+			lnklnk, err := lnkhash.AsLink()
+			if err != nil {
+				return 0, err
+			}
+			target, err := s.lsys.Load(ipld.LinkContext{Ctx: s.ctx}, lnklnk, protoFor(lnklnk))
+			if err != nil {
+				return 0, err
+			}
+
+			asFSNode, err := NewUnixFSFile(s.ctx, target, s.lsys)
+			if err != nil {
+				return 0, err
 			}
+			readers = append(readers, asFSNode)
 		}
 		s.rdr = io.MultiReader(readers...)
 	}
diff --git a/file/wrapped.go b/file/wrapped.go
index 0f558f7..56b2c6c 100644
--- a/file/wrapped.go
+++ b/file/wrapped.go
@@ -24,13 +24,11 @@ func newWrappedNode(substrate ipld.Node) (StreamableByteNode, error) {
 	if ufd.Data.Exists() {
 		return &singleNodeFile{
 			Node: ufd.Data.Must(),
-			ptr:  0,
 		}, nil
 	}
 
 	// an empty degenerate one.
 	return &singleNodeFile{
 		Node: basicnode.NewBytes(nil),
-		ptr:  0,
 	}, nil
 }