format: Move commitgraph and packfile here

1 files changed, 21 insertions, 0 deletions

diff --git a/format/packfile/ingest/byteslice_reader.go b/format/packfile/ingest/byteslice_reader.go
new file mode 100644
index 00000000..a1570ef3
--- /dev/null
+++ b/format/packfile/ingest/byteslice_reader.go
@@ -0,0 +1,21 @@
+package ingest
+
+import "io"
+
+// byteSliceReader implements io.ByteReader on []byte.
+type byteSliceReader struct {
+	data []byte
+	pos  int
+}
+
+// ReadByte reads one byte from receiver.
+func (reader *byteSliceReader) ReadByte() (byte, error) {
+	if reader.pos >= len(reader.data) {
+		return 0, io.EOF
+	}
+
+	b := reader.data[reader.pos]
+	reader.pos++
+
+	return b, nil
+}