Support direct filesystem

disk.go

@@ -3,6 +3,7 @@ package disk
 import (
 	"io"
 
+	"github.com/masahiro331/go-disk/fs"
 	"github.com/masahiro331/go-disk/gpt"
 	"github.com/masahiro331/go-disk/mbr"
 	"github.com/masahiro331/go-disk/types"
@@ -16,6 +17,9 @@ type Driver interface {
 func NewDriver(sr *io.SectionReader) (Driver, error) {
 	m, err := mbr.NewMasterBootRecord(sr)
 	if err != nil {
+		if xerrors.Is(mbr.InvalidSignature, err) {
+			return fs.NewDirectFileSystem(sr), nil
+		}
 		return nil, xerrors.Errorf("failed to new MBR: %w", err)
 	}
 
@@ -28,4 +32,4 @@ func NewDriver(sr *io.SectionReader) (Driver, error) {
 	}
 
 	return g, nil
-}
+}

fs/fs.go

@@ -0,0 +1,65 @@
+package fs
+
+import (
+	"io"
+
+	"github.com/masahiro331/go-disk/types"
+)
+
+type DirectFileSystem struct {
+	Partition *DirectFileSystemPartition
+}
+
+func (d *DirectFileSystem) Next() (types.Partition, error) {
+	if d.Partition == nil {
+		return nil, io.EOF
+	}
+	partition := d.Partition
+	d.Partition = nil
+
+	return partition, nil
+}
+
+type DirectFileSystemPartition struct {
+	sectionReader *io.SectionReader
+}
+
+func (p DirectFileSystemPartition) Index() int {
+	return 0
+}
+
+func (p DirectFileSystemPartition) Name() string {
+	return "0"
+}
+
+func (p DirectFileSystemPartition) GetType() []byte {
+	return []byte{}
+}
+
+func (p DirectFileSystemPartition) GetStartSector() uint64 {
+	return uint64(0)
+}
+
+func (p DirectFileSystemPartition) Bootable() bool {
+	return false
+}
+
+func (p DirectFileSystemPartition) GetSize() uint64 {
+	return uint64(p.sectionReader.Size())
+}
+
+func (p DirectFileSystemPartition) GetSectionReader() io.SectionReader {
+	return *p.sectionReader
+}
+
+func (p DirectFileSystemPartition) IsSupported() bool {
+	return true
+}
+
+func NewDirectFileSystem(sr *io.SectionReader) *DirectFileSystem {
+	return &DirectFileSystem{
+		Partition: &DirectFileSystemPartition{
+			sectionReader: sr,
+		},
+	}
+}