format: Move commitgraph and packfile here

1 files changed, 17 insertions, 0 deletions

diff --git a/format/packfile/ingest/counting_writer.go b/format/packfile/ingest/counting_writer.go
new file mode 100644
index 00000000..051ad9d1
--- /dev/null
+++ b/format/packfile/ingest/counting_writer.go
@@ -0,0 +1,17 @@
+package ingest
+
+import "io"
+
+// countingWriter counts bytes written to dst.
+type countingWriter struct {
+	dst io.Writer
+	n   int
+}
+
+// Write writes src to dst and tracks output byte count.
+func (writer *countingWriter) Write(src []byte) (int, error) {
+	n, err := writer.dst.Write(src)
+	writer.n += n
+
+	return n, err
+}