1 files changed, 55 insertions, 0 deletions
diff --git a/object/storer/loose/parse.go b/object/storer/loose/parse.go
new file mode 100644
index 00000000..789bd821
--- /dev/null
+++ b/object/storer/loose/parse.go
@@ -0,0 +1,55 @@
+package loose
+
+import (
+	"bufio"
+	"errors"
+	"io"
+	"os"
+
+	"codeberg.org/lindenii/furgit/internal/compress/zlib"
+	objectheader "codeberg.org/lindenii/furgit/object/header"
+	objecttype "codeberg.org/lindenii/furgit/object/type"
+)
+
+// decodeAll inflates the full loose object payload from file.
+func decodeAll(file *os.File) ([]byte, error) {
+	zr, err := zlib.NewReader(file)
+	if err != nil {
+		return nil, err
+	}
+
+	defer func() { _ = zr.Close() }()
+
+	return io.ReadAll(zr)
+}
+
+// parseRaw parses a loose object payload in "type size\0content" format.
+func parseRaw(raw []byte) (objecttype.Type, []byte, error) {
+	ty, size, headerLen, ok := objectheader.Parse(raw)
+	if !ok {
+		return objecttype.TypeInvalid, nil, errors.New("objectstorer/loose: malformed object header")
+	}
+
+	content := raw[headerLen:]
+	if int64(len(content)) != size {
+		return objecttype.TypeInvalid, nil, errors.New("objectstorer/loose: object header size/content mismatch")
+	}
+
+	return ty, content, nil
+}
+
+// readHeader reads and parses a loose object header from br, and returns
+// the raw header bytes including the trailing NUL.
+func readHeader(br *bufio.Reader) ([]byte, objecttype.Type, int64, error) {
+	header, err := br.ReadSlice(0)
+	if err != nil {
+		return nil, objecttype.TypeInvalid, 0, err
+	}
+
+	ty, size, _, ok := objectheader.Parse(header)
+	if !ok {
+		return nil, objecttype.TypeInvalid, 0, errors.New("objectstorer/loose: malformed object header")
+	}
+
+	return header, ty, size, nil
+}