gobex: Translate posix error code to proper OBEX response opcode

This patch create a map between posix errors code and OBEX response
opcode and use it to generate a proper response in case a transfer
failed instead of always responding with internal error.

gobex/gobex-transfer.c

@@ -501,6 +501,7 @@ static gssize get_get_data(void *buf, gsize len, gpointer user_data)
 	GObexPacket *req, *rsp;
 	GError *err = NULL;
 	gssize ret;
+	guint8 op;
 
 	g_obex_debug(G_OBEX_DEBUG_TRANSFER, "transfer %u", transfer->id);
 
@@ -530,8 +531,9 @@ static gssize get_get_data(void *buf, gsize len, gpointer user_data)
 		return ret;
 	}
 
-	req = g_obex_packet_new(G_OBEX_RSP_INTERNAL_SERVER_ERROR, TRUE,
-							G_OBEX_HDR_INVALID);
+	op = g_obex_errno_to_rsp(ret);
+
+	req = g_obex_packet_new(op, TRUE, G_OBEX_HDR_INVALID);
 	g_obex_send(transfer->obex, req, NULL);
 
 	err = g_error_new(G_OBEX_ERROR, G_OBEX_ERROR_CANCELLED,

gobex/gobex.c

@@ -1471,3 +1471,27 @@ guint g_obex_move(GObex *obex, const char *name, const char *dest,
 
 	return g_obex_send_req(obex, req, -1, func, user_data, err);
 }
+
+guint8 g_obex_errno_to_rsp(int err)
+{
+	switch (err) {
+	case 0:
+		return G_OBEX_RSP_SUCCESS;
+	case -EPERM:
+	case -EACCES:
+		return G_OBEX_RSP_FORBIDDEN;
+	case -ENOENT:
+		return G_OBEX_RSP_NOT_FOUND;
+	case -EBADR:
+		return G_OBEX_RSP_BAD_REQUEST;
+	case -EFAULT:
+		return G_OBEX_RSP_SERVICE_UNAVAILABLE;
+	case -EINVAL:
+		return G_OBEX_RSP_NOT_IMPLEMENTED;
+	case -ENOTEMPTY:
+	case -EEXIST:
+		return G_OBEX_RSP_PRECONDITION_FAILED;
+	default:
+		return G_OBEX_RSP_INTERNAL_SERVER_ERROR;
+	}
+}

gobex/gobex.h

@@ -125,5 +125,6 @@ guint g_obex_get_rsp_pkt(GObex *obex, GObexPacket *rsp,
 gboolean g_obex_cancel_transfer(guint id);
 
 const char *g_obex_strerror(guint8 err_code);
+guint8 g_obex_errno_to_rsp(int err);
 
 #endif /* __GOBEX_H */