1 files changed, 61 insertions, 0 deletions
diff --git a/object/store/loose/parse.go b/object/store/loose/parse.go
new file mode 100644
index 00000000..c3af6159
--- /dev/null
+++ b/object/store/loose/parse.go
@@ -0,0 +1,61 @@
+package loose
+
+import (
+	"bufio"
+	"fmt"
+	"io"
+	"os"
+
+	"lindenii.org/go/furgit/internal/compress/zlib"
+	"lindenii.org/go/furgit/object/header"
+	"lindenii.org/go/furgit/object/store"
+	"lindenii.org/go/furgit/object/typ"
+)
+
+// 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, fmt.Errorf("object/store/loose: %w", err)
+	}
+
+	defer func() { _ = zr.Close() }()
+
+	data, err := io.ReadAll(zr)
+	if err != nil {
+		return nil, fmt.Errorf("object/store/loose: %w", err)
+	}
+
+	return data, nil
+}
+
+// parseRaw parses a loose object payload in "type size\x00content" format.
+func parseRaw(raw []byte) (typ.Type, []byte, error) {
+	ty, size, consumed, err := header.Parse(raw)
+	if err != nil {
+		return typ.Unknown, nil, fmt.Errorf("%w: %w", store.ErrInvalidObject, err)
+	}
+
+	content := raw[consumed:]
+	if len(content) != size {
+		return typ.Unknown, nil, fmt.Errorf("%w: header size/content mismatch", store.ErrInvalidObject)
+	}
+
+	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, typ.Type, int, error) {
+	headerBytes, err := br.ReadSlice(0)
+	if err != nil {
+		return nil, typ.Unknown, 0, fmt.Errorf("object/store/loose: %w", err)
+	}
+
+	ty, size, _, err := header.Parse(headerBytes)
+	if err != nil {
+		return nil, typ.Unknown, 0, fmt.Errorf("%w: %w", store.ErrInvalidObject, err)
+	}
+
+	return headerBytes, ty, size, nil
+}