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-rw-r--r--src/device_link_service.c74
1 files changed, 57 insertions, 17 deletions
diff --git a/src/device_link_service.c b/src/device_link_service.c
index e9aa675..6083d80 100644
--- a/src/device_link_service.c
+++ b/src/device_link_service.c
@@ -25,44 +25,49 @@
#include "debug.h"
/**
- * Internally used function to extract the message string from a DLMessage*
+ * Internally used function to extract the message string from a DL* message
* plist.
*
* @param dl_msg The DeviceLink property list to parse.
+ * @param message A pointer that will be set to a newly allocated char*
+ * containing the DLMessage* string from the given plist. It is up to
+ * the caller to free the allocated memory. If this parameter is NULL
+ * it will be ignored.
*
- * @return An allocated char* with the DLMessage from the given plist,
- * or NULL when the plist does not contain any DLMessage. It is up to
- * the caller to free the allocated memory.
+ * @return 1 if the given plist is a DL* message, or 0 if the plist does not
+ * contain any DL* message.
*/
-static char *device_link_service_get_message(plist_t dl_msg)
+static int device_link_service_get_message(plist_t dl_msg, char **message)
{
- plist_t cmd = 0;
+ plist_t cmd = NULL;
char *cmd_str = NULL;
/* sanity check */
if ((plist_get_node_type(dl_msg) != PLIST_ARRAY) || (plist_array_get_size(dl_msg) < 1)) {
- return NULL;
+ return 0;
}
/* get dl command */
cmd = plist_array_get_item(dl_msg, 0);
if (!cmd || (plist_get_node_type(cmd) != PLIST_STRING)) {
- return NULL;
+ return 0;
}
plist_get_string_val(cmd, &cmd_str);
if (!cmd_str) {
- return NULL;
+ return 0;
}
- if ((strlen(cmd_str) < (strlen("DLMessage")+1))
- || (strncmp(cmd_str, "DLMessage", strlen("DLMessage")))) {
+ if ((strlen(cmd_str) < 9) || (strncmp(cmd_str, "DL", 2))) {
free(cmd_str);
- return NULL;
+ return 0;
}
- /* we got a DLMessage* command */
- return cmd_str;
+ if (message)
+ *message = cmd_str;
+
+ /* we got a DL* message */
+ return 1;
}
/**
@@ -153,7 +158,7 @@ device_link_service_error_t device_link_service_version_exchange(device_link_ser
err = DEVICE_LINK_SERVICE_E_MUX_ERROR;
goto leave;
}
- msg = device_link_service_get_message(array);
+ device_link_service_get_message(array, &msg);
if (!msg || strcmp(msg, "DLMessageVersionExchange")) {
debug_info("Did not receive DLMessageVersionExchange from device!");
err = DEVICE_LINK_SERVICE_E_PLIST_ERROR;
@@ -208,7 +213,7 @@ device_link_service_error_t device_link_service_version_exchange(device_link_ser
err = DEVICE_LINK_SERVICE_E_MUX_ERROR;
goto leave;
}
- msg = device_link_service_get_message(array);
+ device_link_service_get_message(array, &msg);
if (!msg || strcmp(msg, "DLMessageDeviceReady")) {
debug_info("Did not get DLMessageDeviceReady!");
err = DEVICE_LINK_SERVICE_E_PLIST_ERROR;
@@ -313,6 +318,40 @@ device_link_service_error_t device_link_service_send_process_message(device_link
}
/**
+ * Receives a DL* message plist
+ *
+ * @param client The connected device link service client used for receiving.
+ * @param msg_plist Pointer to a plist that will be set to the contents of the
+ * message plist upon successful return.
+ * @param dlmessage A pointer that will be set to a newly allocated char*
+ * containing the DL* string from the given plist. It is up to the caller
+ * to free the allocated memory. If this parameter is NULL
+ * it will be ignored.
+ *
+ * @return DEVICE_LINK_SERVICE_E_SUCCESS if a DL* message was received,
+ * DEVICE_LINK_SERVICE_E_INVALID_ARG if client or message is invalid,
+ * DEVICE_LINK_SERVICE_E_PLIST_ERROR if the received plist is invalid
+ * or is not a DL* message plist, or DEVICE_LINK_SERVICE_E_MUX_ERROR if
+ * receiving from the device failed.
+ */
+device_link_service_error_t device_link_service_receive_message(device_link_service_client_t client, plist_t *msg_plist, char **dlmessage)
+{
+ if (!client || !client->parent || !msg_plist)
+ return DEVICE_LINK_SERVICE_E_INVALID_ARG;
+
+ *msg_plist = NULL;
+ if (property_list_service_receive_plist(client->parent, msg_plist) != PROPERTY_LIST_SERVICE_E_SUCCESS) {
+ return DEVICE_LINK_SERVICE_E_MUX_ERROR;
+ }
+
+ if (!device_link_service_get_message(*msg_plist, dlmessage)) {
+ debug_info("Did not receive a DL* message as expected!");
+ return DEVICE_LINK_SERVICE_E_PLIST_ERROR;
+ }
+ return DEVICE_LINK_SERVICE_E_SUCCESS;
+}
+
+/**
* Receives a DLMessageProcessMessage plist.
*
* @param client The connected device link service client used for receiving.
@@ -337,7 +376,8 @@ device_link_service_error_t device_link_service_receive_process_message(device_l
device_link_service_error_t err = DEVICE_LINK_SERVICE_E_UNKNOWN_ERROR;
- char *msg = device_link_service_get_message(pmsg);
+ char *msg = NULL;
+ device_link_service_get_message(pmsg, &msg);
if (!msg || strcmp(msg, "DLMessageProcessMessage")) {
debug_info("Did not receive DLMessageProcessMessage as expected!");
err = DEVICE_LINK_SERVICE_E_PLIST_ERROR;