From fd100fd8425b82c09eba2e291d1dcbfcb1242774 Mon Sep 17 00:00:00 2001
From: Luke Shumaker <lukeshu@lukeshu.com>
Date: Sun, 5 Jun 2022 10:36:03 -0600
Subject: more, fixup array init

---
 pkg/btrfs/btrfsitem/item_chunk.go    |  1 +
 pkg/btrfs/btrfsitem/item_dir.go      |  1 +
 pkg/btrfs/btrfsitem/item_inoderef.go |  1 +
 pkg/btrfs/btrfsitem/item_uuid.go     | 10 ++++------
 4 files changed, 7 insertions(+), 6 deletions(-)

(limited to 'pkg/btrfs/btrfsitem')

diff --git a/pkg/btrfs/btrfsitem/item_chunk.go b/pkg/btrfs/btrfsitem/item_chunk.go
index 826ecc6..eae8339 100644
--- a/pkg/btrfs/btrfsitem/item_chunk.go
+++ b/pkg/btrfs/btrfsitem/item_chunk.go
@@ -34,6 +34,7 @@ func (chunk *Chunk) UnmarshalBinary(dat []byte) (int, error) {
 	if err != nil {
 		return n, err
 	}
+	chunk.Stripes = nil
 	for i := 0; i < int(chunk.NumStripes); i++ {
 		var stripe ChunkStripe
 		_n, err := binstruct.Unmarshal(dat[n:], &stripe)
diff --git a/pkg/btrfs/btrfsitem/item_dir.go b/pkg/btrfs/btrfsitem/item_dir.go
index afef12d..6814041 100644
--- a/pkg/btrfs/btrfsitem/item_dir.go
+++ b/pkg/btrfs/btrfsitem/item_dir.go
@@ -10,6 +10,7 @@ import (
 type DirList []Dir // DIR_ITEM=84, DIR_INDEX=96, XATTR_ITEM=24
 
 func (o *DirList) UnmarshalBinary(dat []byte) (int, error) {
+	*o = nil
 	n := 0
 	for n < len(dat) {
 		var ref Dir
diff --git a/pkg/btrfs/btrfsitem/item_inoderef.go b/pkg/btrfs/btrfsitem/item_inoderef.go
index e59c4b3..39b7738 100644
--- a/pkg/btrfs/btrfsitem/item_inoderef.go
+++ b/pkg/btrfs/btrfsitem/item_inoderef.go
@@ -7,6 +7,7 @@ import (
 type InodeRefList []InodeRef // INODE_REF=12
 
 func (o *InodeRefList) UnmarshalBinary(dat []byte) (int, error) {
+	*o = nil
 	n := 0
 	for n < len(dat) {
 		var ref InodeRef
diff --git a/pkg/btrfs/btrfsitem/item_uuid.go b/pkg/btrfs/btrfsitem/item_uuid.go
index 894ccff..d66e102 100644
--- a/pkg/btrfs/btrfsitem/item_uuid.go
+++ b/pkg/btrfs/btrfsitem/item_uuid.go
@@ -7,12 +7,10 @@ import (
 
 // The Key for this item is a UUID, and the item is a list of
 // subvolume IDs (ObjectIDs) that that UUID maps to.
-type UUIDMap struct { // UUID_SUBVOL=251 UUID_RECEIVED_SUBVOL=252
-	SubvolIDs []internal.ObjID
-}
+type UUIDMap []internal.ObjID // UUID_SUBVOL=251 UUID_RECEIVED_SUBVOL=252
 
 func (o *UUIDMap) UnmarshalBinary(dat []byte) (int, error) {
-	o.SubvolIDs = nil
+	*o = nil
 	var n int
 	for len(dat) > n {
 		var subvolID internal.ObjID
@@ -21,14 +19,14 @@ func (o *UUIDMap) UnmarshalBinary(dat []byte) (int, error) {
 		if err != nil {
 			return n, err
 		}
-		o.SubvolIDs = append(o.SubvolIDs, subvolID)
+		*o = append(*o, subvolID)
 	}
 	return n, nil
 }
 
 func (o UUIDMap) MarshalBinary() ([]byte, error) {
 	var ret []byte
-	for _, subvolID := range o.SubvolIDs {
+	for _, subvolID := range o {
 		bs, err := binstruct.Marshal(subvolID)
 		ret = append(ret, bs...)
 		if err != nil {
-- 
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