.

t/neo/storage/fs1/index.go

@@ -147,9 +147,23 @@ out:
 	return &IndexSaveError{err}
 }
 
-// XXX do we need it?
-// func (fsi *fsIndex) SaveFile(topPos int64, path string) error {
-// }
+func (fsi *fsIndex) SaveFile(topPos int64, path string) (err error) {
+	f, err := os.Create(path)
+	if err != nil {
+		return &IndexSaveError{err}
+	}
+
+	defer func() {
+		err2 := f.Close()
+		if err2 != nil && err == nil {
+			err = &IndexSaveError{err2}
+		}
+	}()
+
+	err = fsi.Save(topPos, f)
+	return
+
+}
 
 // IndexLoadError is the error type returned by index load routines
 type IndexLoadError struct {
@@ -159,12 +173,13 @@ type IndexLoadError struct {
 }
 
 func (e *IndexLoadError) Error() string {
-	s := e.Filename
-	if s != "" {
-		s += ": "
+	s := "index load: "
+	if e.Filename != "" {
+		s += e.Filename + ": "
+	}
+	if e.Pos != -1 {
+		s += "pickle @" + strconv.FormatInt(e.Pos, 10) + ": "
 	}
-	s += "index load: "
-	s += "pickle @" + strconv.FormatInt(e.Pos, 10) + ": "
 	s += e.Err.Error()
 	return s
 }
@@ -276,7 +291,22 @@ out:
 	return 0, nil, &IndexLoadError{IOName(r), picklePos, err}
 }
 
-// XXX LoadIndexFile - do we need it ?
+func LoadIndexFile(path string) (topPos int64, fsi *fsIndex, err error) {
+	f, err := os.Open(path)
+	if err != nil {
+		return 0, nil, &IndexLoadError{path, -1, err}
+	}
+
+	defer func() {
+		err2 := f.Close()
+		if err2 != nil && err == nil {
+			err = &IndexLoadError{path, -1, err}
+			topPos, fsi = 0, nil
+		}
+	}()
+
+	return LoadIndex(f)
+}
 
 
 // CountReader is an io.Reader that count total bytes read

t/neo/storage/fs1/index_test.go

@@ -3,6 +3,8 @@
 package fs1
 
 import (
+	"io/ioutil"
+	"os"
 	"sort"
 	"testing"
 
@@ -20,6 +22,25 @@ func (p byOid) Len() int           { return len(p) }
 func (p byOid) Swap(i, j int)      { p[i], p[j] = p[j], p[i] }
 func (p byOid) Less(i, j int) bool { return p[i].oid < p[j].oid }
 
+var indexTest1 = [...]indexEntry {
+	{0x0000000000000000, 111},
+	{0x0000000000000001, 222},
+	{0x000000000000ffff, 333},
+	{0x0000000000001234, 444},
+	{0x0000000000010002, 555},
+	{0x0000000000010001, 665},
+	{0xffffffffffffffff, 777},
+	{0xfffffffffffffff0, 888},
+	{0x8000000000000000, 999},
+	{0xa000000000000000, 0x7fffffffffffffff},
+}
+
+func setIndex(fsi *fsIndex, kv []indexEntry) {
+	for _, entry := range kv {
+		fsi.Set(entry.oid, entry.pos)
+	}
+}
+
 func TestIndexLookup(t *testing.T) {
 	// the lookup is tested in cznic.b itself
 	// here we only lightly exercise it
@@ -30,23 +51,10 @@ func TestIndexLookup(t *testing.T) {
 	}
 
 
-	tt := [...]indexEntry {
-		{0x0000000000000000, 111},
-		{0x0000000000000001, 222},
-		{0x000000000000ffff, 333},
-		{0x0000000000001234, 444},
-		{0x0000000000010002, 555},
-		{0x0000000000010001, 665},
-		{0xffffffffffffffff, 777},
-		{0xfffffffffffffff0, 888},
-		{0x8000000000000000, 999},
-		{0xa000000000000000, 0x7fffffffffffffff},
-	}
+	tt := indexTest1
 
 	// set
-	for _, entry := range tt {
-		fsi.Set(entry.oid, entry.pos)
-	}
+	setIndex(fsi, tt[:])
 
 	// get
 	for _, entry := range tt {
@@ -91,6 +99,31 @@ func TestIndexLookup(t *testing.T) {
 	}
 }
 
-
+//
 func TestIndexSaveLoad(t *testing.T) {
+	workdir, err := ioutil.TempDir("", "t-index")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(workdir)
+
+	topPos := int64(786)
+	fsi := fsIndexNew()
+	setIndex(fsi, indexTest1[:])
+
+	err = fsi.SaveFile(topPos, workdir + "/1.fs.index")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	topPos2, fsi2, err := LoadIndexFile(workdir + "/1.fs.index")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	if topPos2 != topPos {
+		t.Errorf("index load: topPos mismatch: %v  ; want %v", topPos2, topPos)
+	}
+
+	_ = fsi2
 }