objectstore/loose: Add loose backend

1 files changed, 30 insertions, 0 deletions

diff --git a/objectstore/loose/read_header.go b/objectstore/loose/read_header.go
new file mode 100644
index 00000000..0fa587fc
--- /dev/null
+++ b/objectstore/loose/read_header.go
@@ -0,0 +1,30 @@
+package loose
+
+import (
+	"bufio"
+	"compress/zlib"
+
+	"codeberg.org/lindenii/furgit/objectid"
+	"codeberg.org/lindenii/furgit/objecttype"
+)
+
+// ReadHeader reads an object's type and declared content length.
+func (store *Store) ReadHeader(id objectid.ObjectID) (objecttype.Type, int64, error) {
+	file, err := store.openObject(id)
+	if err != nil {
+		return objecttype.TypeInvalid, 0, err
+	}
+	defer func() { _ = file.Close() }()
+
+	zr, err := zlib.NewReader(file)
+	if err != nil {
+		return objecttype.TypeInvalid, 0, err
+	}
+	defer func() { _ = zr.Close() }()
+
+	ty, size, err := readHeader(bufio.NewReader(zr))
+	if err != nil {
+		return objecttype.TypeInvalid, 0, err
+	}
+	return ty, size, nil
+}