adding ReadFromFile with read options

weed/storage/needle/needle_read_options.go

@@ -0,0 +1,24 @@
+package needle
+
+import (
+	"github.com/seaweedfs/seaweedfs/weed/storage/backend"
+	. "github.com/seaweedfs/seaweedfs/weed/storage/types"
+)
+
+// NeedleReadOptions specifies which parts of the Needle to read.
+type NeedleReadOptions struct {
+	ReadHeader bool // always true for any read
+	ReadData   bool // read the Data field
+	ReadMeta   bool // read metadata fields (Name, Mime, LastModified, Ttl, Pairs, etc.)
+}
+
+// ReadFromFile reads the Needle from the backend file according to the specified options.
+// For now, this is equivalent to ReadData (reads everything).
+func (n *Needle) ReadFromFile(r backend.BackendStorageFile, offset int64, size Size, version Version, opts NeedleReadOptions) error {
+	// Always read header and body for now (full read)
+	bytes, err := ReadNeedleBlob(r, offset, size, version)
+	if err != nil {
+		return err
+	}
+	return n.ReadBytes(bytes, offset, size, version)
+}