gobex: Add support for on-demand headers

1 files changed, 38 insertions, 0 deletions

diff --git a/gobex/gobex-header.c b/gobex/gobex-header.c
index ff24589..0ef5e24 100644
--- a/gobex/gobex-header.c
+++ b/gobex/gobex-header.c
@@ -43,6 +43,9 @@ struct _GObexHeader {
 		guint8 u8;
 		guint32 u32;
 	} v;
+
+	GObexHeaderDataFunc get_data;
+	gpointer get_data_data;
 };
 
 static glong utf8_to_utf16(gunichar2 **utf16, const char *utf8) {
@@ -80,6 +83,20 @@ static const guint8 *get_bytes(void *to, const guint8 *from, gsize count)
 	return (from + count);
 }
 
+static gsize get_data(GObexHeader *header, guint8 *buf, gsize len)
+{
+	guint16 u16;
+
+	header->vlen = header->get_data(header, buf + 2, len - 2,
+						header->get_data_data);
+
+	header->hlen = header->vlen + 3;
+	u16 = g_htons(header->hlen);
+	memcpy(buf, &u16, sizeof(u16));
+
+	return header->hlen;
+}
+
 gsize g_obex_header_encode(GObexHeader *header, void *buf, gsize buf_len)
 {
 	guint8 *ptr = buf;
@@ -105,6 +122,9 @@ gsize g_obex_header_encode(GObexHeader *header, void *buf, gsize buf_len)
 		g_free(utf16);
 		break;
 	case G_OBEX_HDR_TYPE_BYTES:
+		if (header->get_data)
+			return get_data(header, ptr, buf_len - 1);
+
 		u16 = g_htons(header->hlen);
 		ptr = put_bytes(ptr, &u16, sizeof(u16));
 		if (header->extdata)
@@ -362,6 +382,24 @@ GObexHeader *g_obex_header_new_bytes(guint8 id, void *data, gsize len,
 	return header;
 }
 
+GObexHeader *g_obex_header_new_on_demand(guint8 id, GObexHeaderDataFunc func,
+							gpointer user_data)
+{
+	GObexHeader *header;
+
+	if (G_OBEX_HDR_TYPE(id) != G_OBEX_HDR_TYPE_BYTES)
+		return NULL;
+
+	header = g_new0(GObexHeader, 1);
+
+	header->id = id;
+	header->hlen = 3;
+	header->get_data = func;
+	header->get_data_data = user_data;
+
+	return header;
+}
+
 GObexHeader *g_obex_header_new_uint8(guint8 id, guint8 val)
 {
 	GObexHeader *header;