1 files changed, 36 insertions, 0 deletions
diff --git a/hotline/file_header.go b/hotline/file_header.go
new file mode 100644
index 0000000..60c652e
--- /dev/null
+++ b/hotline/file_header.go
@@ -0,0 +1,36 @@
+package hotline
+
+import (
+	"encoding/binary"
+	"github.com/jhalter/mobius/concat"
+)
+
+type FileHeader struct {
+	Size     []byte // Total size of FileHeader payload
+	Type     []byte // 0 for file, 1 for dir
+	FilePath []byte // encoded file path
+}
+
+func NewFileHeader(fileName string, isDir bool) FileHeader {
+	fh := FileHeader{
+		Size:     make([]byte, 2),
+		Type:     []byte{0x00, 0x00},
+		FilePath: EncodeFilePath(fileName),
+	}
+	if isDir {
+		fh.Type = []byte{0x00, 0x01}
+	}
+
+	encodedPathLen := uint16(len(fh.FilePath) + len(fh.Type))
+	binary.BigEndian.PutUint16(fh.Size, encodedPathLen)
+
+	return fh
+}
+
+func (fh *FileHeader) Payload() []byte {
+	return concat.Slices(
+		fh.Size,
+		fh.Type,
+		fh.FilePath,
+	)
+}