btrfs: Split off btrfstree and btrfsprim sub-packages

1 files changed, 48 insertions, 0 deletions

diff --git a/lib/btrfs/btrfsprim/misc.go b/lib/btrfs/btrfsprim/misc.go
new file mode 100644
index 0000000..0ebbe19
--- /dev/null
+++ b/lib/btrfs/btrfsprim/misc.go
@@ -0,0 +1,48 @@
+// Copyright (C) 2022  Luke Shumaker <lukeshu@lukeshu.com>
+//
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+package btrfsprim
+
+import (
+	"fmt"
+	"time"
+
+	"git.lukeshu.com/btrfs-progs-ng/lib/binstruct"
+	"git.lukeshu.com/btrfs-progs-ng/lib/containers"
+)
+
+type Generation uint64
+
+type Key struct {
+	ObjectID      ObjID    `bin:"off=0x0, siz=0x8"` // Each tree has its own set of Object IDs.
+	ItemType      ItemType `bin:"off=0x8, siz=0x1"`
+	Offset        uint64   `bin:"off=0x9, siz=0x8"` // The meaning depends on the item type.
+	binstruct.End `bin:"off=0x11"`
+}
+
+func (k Key) String() string {
+	return fmt.Sprintf("{%v %v %v}", k.ObjectID, k.ItemType, k.Offset)
+}
+
+func (a Key) Cmp(b Key) int {
+	if d := containers.NativeCmp(a.ObjectID, b.ObjectID); d != 0 {
+		return d
+	}
+	if d := containers.NativeCmp(a.ItemType, b.ItemType); d != 0 {
+		return d
+	}
+	return containers.NativeCmp(a.Offset, b.Offset)
+}
+
+var _ containers.Ordered[Key] = Key{}
+
+type Time struct {
+	Sec           int64  `bin:"off=0x0, siz=0x8"` // Number of seconds since 1970-01-01T00:00:00Z.
+	NSec          uint32 `bin:"off=0x8, siz=0x4"` // Number of nanoseconds since the beginning of the second.
+	binstruct.End `bin:"off=0xc"`
+}
+
+func (t Time) ToStd() time.Time {
+	return time.Unix(t.Sec, int64(t.NSec))
+}