Imported Upstream version 1.1.1+rev1207upstream/1.1.1+rev1207

1 files changed, 1397 insertions, 0 deletions

diff --git a/lib/libdvben50221/en50221_app_mmi.c b/lib/libdvben50221/en50221_app_mmi.c
new file mode 100644
index 0000000..830eaa3
--- /dev/null
+++ b/lib/libdvben50221/en50221_app_mmi.c
@@ -0,0 +1,1397 @@
+/*
+    en50221 encoder An implementation for libdvb
+    an implementation for the en50221 transport layer
+
+    Copyright (C) 2004, 2005 Manu Abraham <abraham.manu@gmail.com>
+    Copyright (C) 2005 Julian Scheel (julian at jusst dot de)
+    Copyright (C) 2006 Andrew de Quincey (adq_dvb@lidskialf.net)
+
+    This library is free software; you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License as
+    published by the Free Software Foundation; either version 2.1 of
+    the License, or (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public
+    License along with this library; if not, write to the Free Software
+    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+*/
+
+#include <string.h>
+#include <libdvbmisc/dvbmisc.h>
+#include <pthread.h>
+#include <libucsi/dvb/types.h>
+#include "en50221_app_mmi.h"
+#include "en50221_app_tags.h"
+#include "asn_1.h"
+
+struct en50221_app_mmi_session {
+	uint16_t session_number;
+
+	uint8_t *menu_block_chain;
+	uint32_t menu_block_length;
+
+	uint8_t *list_block_chain;
+	uint32_t list_block_length;
+
+	uint8_t *subtitlesegment_block_chain;
+	uint32_t subtitlesegment_block_length;
+
+	uint8_t *subtitledownload_block_chain;
+	uint32_t subtitledownload_block_length;
+
+	struct en50221_app_mmi_session *next;
+};
+
+struct en50221_app_mmi {
+	struct en50221_app_send_functions *funcs;
+	struct en50221_app_mmi_session *sessions;
+
+	en50221_app_mmi_close_callback closecallback;
+	void *closecallback_arg;
+
+	en50221_app_mmi_display_control_callback displaycontrolcallback;
+	void *displaycontrolcallback_arg;
+
+	en50221_app_mmi_keypad_control_callback keypadcontrolcallback;
+	void *keypadcontrolcallback_arg;
+
+	en50221_app_mmi_subtitle_segment_callback subtitlesegmentcallback;
+	void *subtitlesegmentcallback_arg;
+
+	en50221_app_mmi_scene_end_mark_callback sceneendmarkcallback;
+	void *sceneendmarkcallback_arg;
+
+	en50221_app_mmi_scene_control_callback scenecontrolcallback;
+	void *scenecontrolcallback_arg;
+
+	en50221_app_mmi_subtitle_download_callback subtitledownloadcallback;
+	void *subtitledownloadcallback_arg;
+
+	en50221_app_mmi_flush_download_callback flushdownloadcallback;
+	void *flushdownloadcallback_arg;
+
+	en50221_app_mmi_enq_callback enqcallback;
+	void *enqcallback_arg;
+
+	en50221_app_mmi_menu_callback menucallback;
+	void *menucallback_arg;
+
+	en50221_app_mmi_list_callback listcallback;
+	void *listcallback_arg;
+
+	pthread_mutex_t lock;
+};
+
+static int en50221_app_mmi_parse_close(struct en50221_app_mmi *mmi,
+				       uint8_t slot_id,
+				       uint16_t session_number,
+				       uint8_t * data,
+				       uint32_t data_length);
+static int en50221_app_mmi_parse_display_control(struct en50221_app_mmi
+						 *mmi, uint8_t slot_id,
+						 uint16_t session_number,
+						 uint8_t * data,
+						 uint32_t data_length);
+static int en50221_app_mmi_parse_keypad_control(struct en50221_app_mmi
+						*mmi, uint8_t slot_id,
+						uint16_t session_number,
+						uint8_t * data,
+						uint32_t data_length);
+static int en50221_app_mmi_parse_enq(struct en50221_app_mmi *mmi,
+				     uint8_t slot_id,
+				     uint16_t session_number,
+				     uint8_t * data, uint32_t data_length);
+static int en50221_app_mmi_parse_list_menu(struct en50221_app_mmi *mmi,
+					   uint8_t slot_id,
+					   uint16_t session_number,
+					   uint32_t tag_id, int more_last,
+					   uint8_t * data,
+					   uint32_t data_length);
+static int en50221_app_mmi_parse_subtitle(struct en50221_app_mmi *mmi,
+					  uint8_t slot_id,
+					  uint16_t session_number,
+					  uint32_t tag_id, int more_last,
+					  uint8_t * data,
+					  uint32_t data_length);
+static int en50221_app_mmi_parse_scene_end_mark(struct en50221_app_mmi *mmi,
+						uint8_t slot_id,
+						uint16_t session_number,
+						uint8_t * data,
+						uint32_t data_length);
+static int en50221_app_mmi_parse_scene_control(struct en50221_app_mmi *mmi,
+					       uint8_t slot_id,
+					       uint16_t session_number,
+					       uint8_t * data,
+					       uint32_t data_length);
+static int en50221_app_mmi_parse_subtitle(struct en50221_app_mmi *mmi,
+					  uint8_t slot_id,
+					  uint16_t session_number,
+					  uint32_t tag_id, int more_last,
+					  uint8_t * data,
+					  uint32_t data_length);
+static int en50221_app_mmi_parse_flush_download(struct en50221_app_mmi *mmi,
+						uint8_t slot_id,
+						uint16_t session_number,
+						uint8_t * data,
+						uint32_t data_length);
+static int en50221_app_mmi_defragment(struct en50221_app_mmi *mmi,
+				      uint16_t session_number,
+				      uint32_t tag_id, int more_last,
+				      uint8_t * indata,
+				      uint32_t indata_length,
+				      uint8_t ** outdata,
+				      uint32_t * outdata_length);
+static int en50221_app_mmi_defragment_text(uint8_t * data,
+					   uint32_t data_length,
+					   uint8_t ** outdata,
+					   uint32_t * outdata_length,
+					   uint32_t * outconsumed);
+
+
+
+struct en50221_app_mmi *en50221_app_mmi_create(struct en50221_app_send_functions *funcs)
+{
+	struct en50221_app_mmi *mmi = NULL;
+
+	// create structure and set it up
+	mmi = malloc(sizeof(struct en50221_app_mmi));
+	if (mmi == NULL) {
+		return NULL;
+	}
+	mmi->funcs = funcs;
+	mmi->closecallback = NULL;
+	mmi->displaycontrolcallback = NULL;
+	mmi->keypadcontrolcallback = NULL;
+	mmi->subtitlesegmentcallback = NULL;
+	mmi->sceneendmarkcallback = NULL;
+	mmi->scenecontrolcallback = NULL;
+	mmi->subtitledownloadcallback = NULL;
+	mmi->flushdownloadcallback = NULL;
+	mmi->enqcallback = NULL;
+	mmi->menucallback = NULL;
+	mmi->listcallback = NULL;
+	mmi->sessions = NULL;
+
+	pthread_mutex_init(&mmi->lock, NULL);
+
+	// done
+	return mmi;
+}
+
+void en50221_app_mmi_destroy(struct en50221_app_mmi *mmi)
+{
+	struct en50221_app_mmi_session *cur_s = mmi->sessions;
+	while (cur_s) {
+		struct en50221_app_mmi_session *next = cur_s->next;
+		if (cur_s->menu_block_chain)
+			free(cur_s->menu_block_chain);
+		if (cur_s->list_block_chain)
+			free(cur_s->list_block_chain);
+		if (cur_s->subtitlesegment_block_chain)
+			free(cur_s->subtitlesegment_block_chain);
+		if (cur_s->subtitledownload_block_chain)
+			free(cur_s->subtitledownload_block_chain);
+		free(cur_s);
+		cur_s = next;
+	}
+
+	pthread_mutex_destroy(&mmi->lock);
+	free(mmi);
+}
+
+void en50221_app_mmi_clear_session(struct en50221_app_mmi *mmi,
+				   uint16_t session_number)
+{
+	pthread_mutex_lock(&mmi->lock);
+	struct en50221_app_mmi_session *cur_s = mmi->sessions;
+	struct en50221_app_mmi_session *prev_s = NULL;
+	while (cur_s) {
+		if (cur_s->session_number == session_number) {
+			if (cur_s->menu_block_chain)
+				free(cur_s->menu_block_chain);
+			if (cur_s->list_block_chain)
+				free(cur_s->list_block_chain);
+			if (cur_s->subtitlesegment_block_chain)
+				free(cur_s->subtitlesegment_block_chain);
+			if (cur_s->subtitledownload_block_chain)
+				free(cur_s->subtitledownload_block_chain);
+			if (prev_s) {
+				prev_s->next = cur_s->next;
+			} else {
+				mmi->sessions = cur_s->next;
+			}
+			free(cur_s);
+			return;
+		}
+
+		prev_s = cur_s;
+		cur_s = cur_s->next;
+	}
+	pthread_mutex_unlock(&mmi->lock);
+}
+
+void en50221_app_mmi_register_close_callback(struct en50221_app_mmi *mmi,
+					     en50221_app_mmi_close_callback callback,
+					     void *arg)
+{
+	pthread_mutex_lock(&mmi->lock);
+	mmi->closecallback = callback;
+	mmi->closecallback_arg = arg;
+	pthread_mutex_unlock(&mmi->lock);
+}
+
+void en50221_app_mmi_register_display_control_callback(struct en50221_app_mmi *mmi,
+						       en50221_app_mmi_display_control_callback callback,
+						       void *arg)
+{
+	pthread_mutex_lock(&mmi->lock);
+	mmi->displaycontrolcallback = callback;
+	mmi->displaycontrolcallback_arg = arg;
+	pthread_mutex_unlock(&mmi->lock);
+}
+
+void en50221_app_mmi_register_keypad_control_callback(struct en50221_app_mmi *mmi,
+						      en50221_app_mmi_keypad_control_callback callback,
+						      void *arg)
+{
+	pthread_mutex_lock(&mmi->lock);
+	mmi->keypadcontrolcallback = callback;
+	mmi->keypadcontrolcallback_arg = arg;
+	pthread_mutex_unlock(&mmi->lock);
+}
+
+void en50221_app_mmi_register_subtitle_segment_callback(struct en50221_app_mmi *mmi,
+							en50221_app_mmi_subtitle_segment_callback callback,
+							void *arg)
+{
+	pthread_mutex_lock(&mmi->lock);
+	mmi->subtitlesegmentcallback = callback;
+	mmi->subtitlesegmentcallback_arg = arg;
+	pthread_mutex_unlock(&mmi->lock);
+}
+
+void en50221_app_mmi_register_scene_end_mark_callback(struct en50221_app_mmi *mmi,
+						      en50221_app_mmi_scene_end_mark_callback callback, void *arg)
+{
+	pthread_mutex_lock(&mmi->lock);
+	mmi->sceneendmarkcallback = callback;
+	mmi->sceneendmarkcallback_arg = arg;
+	pthread_mutex_unlock(&mmi->lock);
+}
+
+void en50221_app_mmi_register_scene_control_callback(struct en50221_app_mmi *mmi,
+						     en50221_app_mmi_scene_control_callback callback, void *arg)
+{
+	pthread_mutex_lock(&mmi->lock);
+	mmi->scenecontrolcallback = callback;
+	mmi->scenecontrolcallback_arg = arg;
+	pthread_mutex_unlock(&mmi->lock);
+}
+
+void en50221_app_mmi_register_subtitle_download_callback(struct en50221_app_mmi *mmi,
+							 en50221_app_mmi_subtitle_download_callback callback,
+							 void *arg)
+{
+	pthread_mutex_lock(&mmi->lock);
+	mmi->subtitledownloadcallback = callback;
+	mmi->subtitledownloadcallback_arg = arg;
+	pthread_mutex_unlock(&mmi->lock);
+}
+
+void en50221_app_mmi_register_flush_download_callback(struct en50221_app_mmi *mmi,
+						      en50221_app_mmi_flush_download_callback callback,
+						      void *arg)
+{
+	pthread_mutex_lock(&mmi->lock);
+	mmi->flushdownloadcallback = callback;
+	mmi->flushdownloadcallback_arg = arg;
+	pthread_mutex_unlock(&mmi->lock);
+}
+
+void en50221_app_mmi_register_enq_callback(struct en50221_app_mmi *mmi,
+					   en50221_app_mmi_enq_callback callback,
+					   void *arg)
+{
+	pthread_mutex_lock(&mmi->lock);
+	mmi->enqcallback = callback;
+	mmi->enqcallback_arg = arg;
+	pthread_mutex_unlock(&mmi->lock);
+}
+
+void en50221_app_mmi_register_menu_callback(struct en50221_app_mmi *mmi,
+					    en50221_app_mmi_menu_callback callback,
+					    void *arg)
+{
+	pthread_mutex_lock(&mmi->lock);
+	mmi->menucallback = callback;
+	mmi->menucallback_arg = arg;
+	pthread_mutex_unlock(&mmi->lock);
+}
+
+void en50221_app_mmi_register_list_callback(struct en50221_app_mmi *mmi,
+					    en50221_app_mmi_list_callback callback,
+					    void *arg)
+{
+	pthread_mutex_lock(&mmi->lock);
+	mmi->listcallback = callback;
+	mmi->listcallback_arg = arg;
+	pthread_mutex_unlock(&mmi->lock);
+}
+
+int en50221_app_mmi_close(struct en50221_app_mmi *mmi,
+			  uint16_t session_number,
+			  uint8_t cmd_id, uint8_t delay)
+{
+	uint8_t data[6];
+	int data_length = 5;
+
+	data[0] = (TAG_CLOSE_MMI >> 16) & 0xFF;
+	data[1] = (TAG_CLOSE_MMI >> 8) & 0xFF;
+	data[2] = TAG_CLOSE_MMI & 0xFF;
+	data[3] = 1;
+	data[4] = cmd_id;
+	if (cmd_id == MMI_CLOSE_MMI_CMD_ID_DELAY) {
+		data[3] = 2;
+		data[5] = delay;
+		data_length = 6;
+	}
+	return mmi->funcs->send_data(mmi->funcs->arg, session_number, data,
+				     data_length);
+}
+
+int en50221_app_mmi_display_reply(struct en50221_app_mmi *mmi,
+				  uint16_t session_number,
+				  uint8_t reply_id,
+				  struct en50221_app_mmi_display_reply_details *details)
+{
+	uint8_t data[32];
+	struct iovec iov[2];
+	uint32_t iov_count;
+	int length_field_len;
+
+	// fill out the start of the header
+	data[0] = (TAG_DISPLAY_REPLY >> 16) & 0xFF;
+	data[1] = (TAG_DISPLAY_REPLY >> 8) & 0xFF;
+	data[2] = TAG_DISPLAY_REPLY & 0xFF;
+
+	switch (reply_id) {
+	case MMI_DISPLAY_REPLY_ID_MMI_MODE_ACK:
+		data[3] = 2;
+		data[4] = reply_id;
+		data[5] = details->u.mode_ack.mmi_mode;
+		iov[0].iov_base = data;
+		iov[0].iov_len = 6;
+		iov_count = 1;
+		break;
+
+	case MMI_DISPLAY_REPLY_ID_LIST_DISPLAY_CHAR_TABLES:
+	case MMI_DISPLAY_REPLY_ID_LIST_INPUT_CHAR_TABLES:
+		if ((length_field_len =
+			asn_1_encode(details->u.char_table.table_length + 1, data + 3, 3)) < 0) {
+			return -1;
+		}
+		data[3 + length_field_len] = reply_id;
+		iov[0].iov_base = data;
+		iov[0].iov_len = 3 + length_field_len + 1;
+		iov[1].iov_base = details->u.char_table.table;
+		iov[1].iov_len = details->u.char_table.table_length;
+		iov_count = 2;
+		break;
+
+	case MMI_DISPLAY_REPLY_ID_LIST_OVERLAY_GFX_CHARACTERISTICS:
+	case MMI_DISPLAY_REPLY_ID_LIST_FULLSCREEN_GFX_CHARACTERISTICS:
+		{
+			if ((length_field_len =
+				asn_1_encode(1 + 9 + (details->u.gfx.num_pixel_depths * 2), data + 3, 3)) < 0) {
+				return -1;
+			}
+			data[3 + length_field_len] = reply_id;
+			data[3 + length_field_len + 1] = details->u.gfx.width >> 8;
+			data[3 + length_field_len + 2] = details->u.gfx.width;
+			data[3 + length_field_len + 3] = details->u.gfx.height >> 8;
+			data[3 + length_field_len + 4] = details->u.gfx.height;
+			data[3 + length_field_len + 5] =
+				((details->u.gfx.aspect_ratio & 0x0f) << 4) |
+				((details->u.gfx.gfx_relation_to_video & 0x07) << 1) |
+				(details->u.gfx.multiple_depths & 1);
+			data[3 + length_field_len + 6] = details->u.gfx.display_bytes >> 4;
+			data[3 + length_field_len + 7] =
+				((details->u.gfx.display_bytes & 0x0f) << 4) |
+				((details->u.gfx.composition_buffer_bytes & 0xf0) >> 4);
+			data[3 + length_field_len + 8] =
+			    	((details->u.gfx.composition_buffer_bytes & 0x0f) << 4) |
+				((details->u.gfx.object_cache_bytes & 0xf0) >> 4);
+			data[3 + length_field_len + 9] =
+			    	((details->u.gfx.object_cache_bytes & 0x0f) << 4) |
+				 (details->u.gfx.num_pixel_depths & 0x0f);
+
+			// render the pixel depths themselves
+			uint8_t *pixdepths =
+			    alloca(details->u.gfx.num_pixel_depths * 2);
+			if (pixdepths == NULL) {
+				return -1;
+			}
+			uint32_t i;
+			for (i = 0; i < details->u.gfx.num_pixel_depths; i++) {
+				pixdepths[0] =
+				    ((details->u.gfx.pixel_depths[i].display_depth & 0x07) << 5) |
+				    ((details->u.gfx.pixel_depths[i].pixels_per_byte & 0x07) << 2);
+				pixdepths[1] =
+				    details->u.gfx.pixel_depths[i].region_overhead;
+				pixdepths += 2;
+			}
+
+			// make up the iovs
+			iov[0].iov_base = data;
+			iov[0].iov_len = 3 + length_field_len + 10;
+			iov[1].iov_base = pixdepths;
+			iov[1].iov_len =
+			    details->u.gfx.num_pixel_depths * 2;
+			iov_count = 2;
+			break;
+		}
+
+	default:
+		data[3] = 1;
+		data[4] = reply_id;
+		iov[0].iov_base = data;
+		iov[0].iov_len = 5;
+		iov_count = 1;
+		break;
+	}
+
+	// sendit
+	return mmi->funcs->send_datav(mmi->funcs->arg, session_number, iov, iov_count);
+}
+
+int en50221_app_mmi_keypress(struct en50221_app_mmi *mmi,
+			     uint16_t session_number, uint8_t keycode)
+{
+	uint8_t data[5];
+
+	data[0] = (TAG_KEYPRESS >> 16) & 0xFF;
+	data[1] = (TAG_KEYPRESS >> 8) & 0xFF;
+	data[2] = TAG_KEYPRESS & 0xFF;
+	data[3] = 1;
+	data[4] = keycode;
+	return mmi->funcs->send_data(mmi->funcs->arg, session_number, data, 5);
+}
+
+int en50221_app_mmi_display_message(struct en50221_app_mmi *mmi,
+				    uint16_t session_number,
+				    uint8_t display_message_id)
+{
+	uint8_t data[5];
+
+	data[0] = (TAG_DISPLAY_MESSAGE >> 16) & 0xFF;
+	data[1] = (TAG_DISPLAY_MESSAGE >> 8) & 0xFF;
+	data[2] = TAG_DISPLAY_MESSAGE & 0xFF;
+	data[3] = 1;
+	data[4] = display_message_id;
+	return mmi->funcs->send_data(mmi->funcs->arg, session_number, data, 5);
+}
+
+int en50221_app_mmi_scene_done(struct en50221_app_mmi *mmi,
+			       uint16_t session_number,
+			       uint8_t decoder_continue,
+			       uint8_t scene_reveal, uint8_t scene_tag)
+{
+	uint8_t data[5];
+
+	data[0] = (TAG_SCENE_DONE >> 16) & 0xFF;
+	data[1] = (TAG_SCENE_DONE >> 8) & 0xFF;
+	data[2] = TAG_SCENE_DONE & 0xFF;
+	data[3] = 1;
+	data[4] =
+		(decoder_continue ? 0x80 : 0x00) |
+	    	(scene_reveal ? 0x40 : 0x00) |
+		(scene_tag & 0x0f);
+	return mmi->funcs->send_data(mmi->funcs->arg, session_number, data, 5);
+}
+
+int en50221_app_mmi_download_reply(struct en50221_app_mmi *mmi,
+				   uint16_t session_number,
+				   uint16_t object_id,
+				   uint8_t download_reply_id)
+{
+	uint8_t data[7];
+
+	data[0] = (TAG_DOWNLOAD_REPLY >> 16) & 0xFF;
+	data[1] = (TAG_DOWNLOAD_REPLY >> 8) & 0xFF;
+	data[2] = TAG_DOWNLOAD_REPLY & 0xFF;
+	data[3] = 3;
+	data[4] = object_id >> 8;
+	data[5] = object_id;
+	data[6] = download_reply_id;
+	return mmi->funcs->send_data(mmi->funcs->arg, session_number, data, 7);
+}
+
+int en50221_app_mmi_answ(struct en50221_app_mmi *mmi,
+			 uint16_t session_number,
+			 uint8_t answ_id,
+			 uint8_t * text, uint32_t text_count)
+{
+	uint8_t buf[10];
+
+	// set up the tag
+	buf[0] = (TAG_ANSWER >> 16) & 0xFF;
+	buf[1] = (TAG_ANSWER >> 8) & 0xFF;
+	buf[2] = TAG_ANSWER & 0xFF;
+
+	// encode the length field
+	struct iovec iov[2];
+	int length_field_len = 0;
+	int iov_count = 1;
+	if (answ_id == MMI_ANSW_ID_ANSWER) {
+		if ((length_field_len = asn_1_encode(text_count + 1, buf + 3, 3)) < 0) {
+			return -1;
+		}
+		buf[3 + length_field_len] = answ_id;
+
+		iov[0].iov_base = buf;
+		iov[0].iov_len = 3 + length_field_len + 1;
+		iov[1].iov_base = text;
+		iov[1].iov_len = text_count;
+		iov_count = 2;
+	} else {
+		buf[3] = 1;
+		buf[4] = answ_id;
+		iov[0].iov_base = buf;
+		iov[0].iov_len = 5;
+		iov_count = 1;
+	}
+
+	// create the data and send it
+	return mmi->funcs->send_datav(mmi->funcs->arg, session_number, iov,
+				      iov_count);
+}
+
+int en50221_app_mmi_menu_answ(struct en50221_app_mmi *mmi,
+			      uint16_t session_number, uint8_t choice_ref)
+{
+	uint8_t data[5];
+
+	data[0] = (TAG_MENU_ANSWER >> 16) & 0xFF;
+	data[1] = (TAG_MENU_ANSWER >> 8) & 0xFF;
+	data[2] = TAG_MENU_ANSWER & 0xFF;
+	data[3] = 1;
+	data[4] = choice_ref;
+	return mmi->funcs->send_data(mmi->funcs->arg, session_number, data, 5);
+}
+
+int en50221_app_mmi_message(struct en50221_app_mmi *mmi,
+			    uint8_t slot_id,
+			    uint16_t session_number,
+			    uint32_t resource_id,
+			    uint8_t * data, uint32_t data_length)
+{
+	(void) resource_id;
+
+	// get the tag
+	if (data_length < 3) {
+		print(LOG_LEVEL, ERROR, 1, "Received short data\n");
+		return -1;
+	}
+	uint32_t tag = (data[0] << 16) | (data[1] << 8) | data[2];
+
+	switch (tag) {
+	case TAG_CLOSE_MMI:
+		return en50221_app_mmi_parse_close(mmi, slot_id,
+						   session_number,
+						   data + 3,
+						   data_length - 3);
+	case TAG_DISPLAY_CONTROL:
+		return en50221_app_mmi_parse_display_control(mmi, slot_id,
+							     session_number,
+							     data + 3,
+							     data_length - 3);
+	case TAG_KEYPAD_CONTROL:
+		return en50221_app_mmi_parse_keypad_control(mmi, slot_id,
+							    session_number,
+							    data + 3,
+							    data_length - 3);
+	case TAG_ENQUIRY:
+		return en50221_app_mmi_parse_enq(mmi, slot_id,
+						 session_number, data + 3,
+						 data_length - 3);
+	case TAG_MENU_LAST:
+		return en50221_app_mmi_parse_list_menu(mmi, slot_id,
+						       session_number, tag,
+						       1, data + 3,
+						       data_length - 3);
+	case TAG_MENU_MORE:
+		return en50221_app_mmi_parse_list_menu(mmi, slot_id,
+						       session_number, tag,
+						       0, data + 3,
+						       data_length - 3);
+	case TAG_LIST_LAST:
+		return en50221_app_mmi_parse_list_menu(mmi, slot_id,
+						       session_number, tag,
+						       1, data + 3,
+						       data_length - 3);
+	case TAG_LIST_MORE:
+		return en50221_app_mmi_parse_list_menu(mmi, slot_id,
+						       session_number, tag,
+						       0, data + 3,
+						       data_length - 3);
+	case TAG_SUBTITLE_SEGMENT_LAST:
+		return en50221_app_mmi_parse_subtitle(mmi, slot_id,
+						      session_number, tag,
+						      1, data + 3,
+						      data_length - 3);
+	case TAG_SUBTITLE_SEGMENT_MORE:
+		return en50221_app_mmi_parse_subtitle(mmi, slot_id,
+						      session_number, tag,
+						      0, data + 3,
+						      data_length - 3);
+	case TAG_SCENE_END_MARK:
+		return en50221_app_mmi_parse_scene_end_mark(mmi, slot_id,
+							    session_number,
+							    data + 3,
+							    data_length - 3);
+	case TAG_SCENE_CONTROL:
+		return en50221_app_mmi_parse_scene_control(mmi, slot_id,
+							   session_number,
+							   data + 3,
+							   data_length - 3);
+	case TAG_SUBTITLE_DOWNLOAD_LAST:
+		return en50221_app_mmi_parse_subtitle(mmi, slot_id,
+						      session_number, tag,
+						      1, data + 3,
+						      data_length - 3);
+	case TAG_SUBTITLE_DOWNLOAD_MORE:
+		return en50221_app_mmi_parse_subtitle(mmi, slot_id,
+						      session_number, tag,
+						      0, data + 3,
+						      data_length - 3);
+	case TAG_FLUSH_DOWNLOAD:
+		return en50221_app_mmi_parse_flush_download(mmi, slot_id,
+							    session_number,
+							    data + 3,
+							    data_length - 3);
+	}
+
+	print(LOG_LEVEL, ERROR, 1, "Received unexpected tag %x\n", tag);
+	return -1;
+}
+
+
+
+
+
+static int en50221_app_mmi_parse_close(struct en50221_app_mmi *mmi,
+				       uint8_t slot_id,
+				       uint16_t session_number,
+				       uint8_t * data,
+				       uint32_t data_length)
+{
+	// validate data
+	if (data_length < 2) {
+		print(LOG_LEVEL, ERROR, 1, "Received short data\n");
+		return -1;
+	}
+	if (data[0] > (data_length - 1)) {
+		print(LOG_LEVEL, ERROR, 1, "Received short data\n");
+		return -1;
+	}
+	uint8_t cmd_id = data[1];
+	uint8_t delay = 0;
+	if (cmd_id == MMI_CLOSE_MMI_CMD_ID_DELAY) {
+		if (data[0] != 2) {
+			print(LOG_LEVEL, ERROR, 1,
+			      "Received short data\n");
+			return -1;
+		}
+		delay = data[2];
+	}
+	// tell the app
+	pthread_mutex_lock(&mmi->lock);
+	en50221_app_mmi_close_callback cb = mmi->closecallback;
+	void *cb_arg = mmi->closecallback_arg;
+	pthread_mutex_unlock(&mmi->lock);
+	if (cb) {
+		return cb(cb_arg, slot_id, session_number, cmd_id, delay);
+	}
+	return 0;
+}
+
+static int en50221_app_mmi_parse_display_control(struct en50221_app_mmi *mmi,
+						 uint8_t slot_id,
+						 uint16_t session_number,
+						 uint8_t *data,
+						 uint32_t data_length)
+{
+	// validate data
+	if (data_length < 2) {
+		print(LOG_LEVEL, ERROR, 1, "Received short data\n");
+		return -1;
+	}
+	if (data[0] > (data_length - 1)) {
+		print(LOG_LEVEL, ERROR, 1, "Received short data\n");
+		return -1;
+	}
+	uint8_t cmd_id = data[1];
+	uint8_t mmi_mode = 0;
+	if (cmd_id == MMI_DISPLAY_CONTROL_CMD_ID_SET_MMI_MODE) {
+		if (data[0] != 2) {
+			print(LOG_LEVEL, ERROR, 1,
+			      "Received short data\n");
+			return -1;
+		}
+		mmi_mode = data[2];
+	}
+	// tell the app
+	pthread_mutex_lock(&mmi->lock);
+	en50221_app_mmi_display_control_callback cb = mmi->displaycontrolcallback;
+	void *cb_arg = mmi->displaycontrolcallback_arg;
+	pthread_mutex_unlock(&mmi->lock);
+	if (cb) {
+		return cb(cb_arg, slot_id, session_number, cmd_id, mmi_mode);
+	}
+	return 0;
+}
+
+static int en50221_app_mmi_parse_keypad_control(struct en50221_app_mmi *mmi,
+						uint8_t slot_id,
+						uint16_t session_number,
+						uint8_t *data,
+						uint32_t data_length)
+{
+	// first of all, decode the length field
+	uint16_t asn_data_length;
+	int length_field_len;
+	if ((length_field_len = asn_1_decode(&asn_data_length, data, data_length)) < 0) {
+		print(LOG_LEVEL, ERROR, 1, "ASN.1 decode error\n");
+		return -1;
+	}
+	// check it
+	if (asn_data_length > (data_length - length_field_len)) {
+		print(LOG_LEVEL, ERROR, 1, "Received short data\n");
+		return -1;
+	}
+	if (asn_data_length < 1) {
+		print(LOG_LEVEL, ERROR, 1, "Received short data\n");
+		return -1;
+	}
+	// skip over the length field
+	data += length_field_len;
+
+	// extract the information
+	uint8_t cmd_id = data[0];
+	uint8_t *keycodes = data + 1;
+
+	// tell the app
+	pthread_mutex_lock(&mmi->lock);
+	en50221_app_mmi_keypad_control_callback cb = mmi->keypadcontrolcallback;
+	void *cb_arg = mmi->keypadcontrolcallback_arg;
+	pthread_mutex_unlock(&mmi->lock);
+	if (cb) {
+		return cb(cb_arg, slot_id, session_number, cmd_id,
+			  keycodes, asn_data_length - 1);
+	}
+	return 0;
+}
+
+static int en50221_app_mmi_parse_enq(struct en50221_app_mmi *mmi,
+				     uint8_t slot_id,
+				     uint16_t session_number,
+				     uint8_t * data, uint32_t data_length)
+{
+	// first of all, decode the length field
+	uint16_t asn_data_length;
+	int length_field_len;
+	if ((length_field_len = asn_1_decode(&asn_data_length, data, data_length)) < 0) {
+		print(LOG_LEVEL, ERROR, 1, "ASN.1 decode error\n");
+		return -1;
+	}
+	// check it
+	if (asn_data_length > (data_length - length_field_len)) {
+		print(LOG_LEVEL, ERROR, 1, "Received short data\n");
+		return -1;
+	}
+	if (asn_data_length < 2) {
+		print(LOG_LEVEL, ERROR, 1, "Received short data\n");
+		return -1;
+	}
+	// skip over the length field
+	data += length_field_len;
+
+	// extract the information
+	uint8_t blind_answer = (data[0] & 0x01) ? 1 : 0;
+	uint8_t answer_length = data[1];
+	uint8_t *text = data + 2;
+
+	// tell the app
+	pthread_mutex_lock(&mmi->lock);
+	en50221_app_mmi_enq_callback cb = mmi->enqcallback;
+	void *cb_arg = mmi->enqcallback_arg;
+	pthread_mutex_unlock(&mmi->lock);
+	if (cb) {
+		return cb(cb_arg, slot_id, session_number, blind_answer,
+			  answer_length, text, asn_data_length - 2);
+	}
+	return 0;
+}
+
+static int en50221_app_mmi_parse_list_menu(struct en50221_app_mmi *mmi,
+					   uint8_t slot_id,
+					   uint16_t session_number,
+					   uint32_t tag_id, int more_last,
+					   uint8_t * data,
+					   uint32_t data_length)
+{
+	int result = 0;
+	uint8_t *text_flags = NULL;
+	struct en50221_app_mmi_text *text_data = NULL;
+	uint32_t i;
+	uint8_t text_count = 0;
+
+	// first of all, decode the length field
+	uint16_t asn_data_length;
+	int length_field_len;
+	if ((length_field_len = asn_1_decode(&asn_data_length, data, data_length)) < 0) {
+		print(LOG_LEVEL, ERROR, 1, "ASN.1 decode error\n");
+		return -1;
+	}
+	// check it
+	if (asn_data_length > (data_length - length_field_len)) {
+		print(LOG_LEVEL, ERROR, 1, "Received short data\n");
+		return -1;
+	}
+	// skip over the length field
+	data += length_field_len;
+
+	// defragment
+	pthread_mutex_lock(&mmi->lock);
+	uint8_t *outdata;
+	uint32_t outdata_length;
+	int dfstatus =
+	    en50221_app_mmi_defragment(mmi, session_number, tag_id,
+				       more_last,
+				       data, asn_data_length,
+				       &outdata, &outdata_length);
+	if (dfstatus <= 0) {
+		pthread_mutex_unlock(&mmi->lock);
+		return dfstatus;
+	}
+	data = outdata;
+	data_length = outdata_length;
+
+	// check the reassembled data length
+	if (data_length < 1) {
+		print(LOG_LEVEL, ERROR, 1, "Received short data\n");
+		pthread_mutex_unlock(&mmi->lock);
+		result = -1;
+		goto exit_cleanup;
+	}
+	// now, parse the data
+	uint8_t choice_nb = data[0];
+	text_count = choice_nb + 3;
+	if (choice_nb == 0xff)
+		text_count = 3;
+	data++;
+	data_length--;
+
+	// variables for extracted text state
+	text_flags = alloca(text_count);
+	if (text_flags == NULL) {
+		pthread_mutex_unlock(&mmi->lock);
+		result = -1;
+		goto exit_cleanup;
+	}
+	memset(text_flags, 0, text_count);
+	text_data = (struct en50221_app_mmi_text *)
+	    alloca(sizeof(struct en50221_app_mmi_text) * text_count);
+	if (text_data == NULL) {
+		pthread_mutex_unlock(&mmi->lock);
+		result = -1;
+		goto exit_cleanup;
+	}
+	memset(text_data, 0,
+	       sizeof(struct en50221_app_mmi_text) * text_count);
+
+	// extract the text!
+	for (i = 0; i < text_count; i++) {
+		uint32_t consumed = 0;
+		int cur_status =
+		    en50221_app_mmi_defragment_text(data, data_length,
+						    &text_data[i].text,
+						    &text_data[i].text_length,
+						    &consumed);
+		if (cur_status < 0) {
+			pthread_mutex_unlock(&mmi->lock);
+			result = -1;
+			goto exit_cleanup;
+		}
+
+		text_flags[i] = cur_status;
+		data += consumed;
+		data_length -= consumed;
+	}
+
+	// work out what to pass to the user
+	struct en50221_app_mmi_text *text_data_for_user = (struct en50221_app_mmi_text *)
+	    alloca(sizeof(struct en50221_app_mmi_text) * text_count);
+	if (text_data_for_user == NULL) {
+		result = -1;
+		goto exit_cleanup;
+	}
+	memcpy(text_data_for_user, text_data,
+	       sizeof(struct en50221_app_mmi_text) * text_count);
+	struct en50221_app_mmi_text *text_ptr = NULL;
+	if (text_count > 3) {
+		text_ptr = &text_data_for_user[3];
+	}
+	uint8_t *items_raw = NULL;
+	uint32_t items_raw_length = 0;
+	if (choice_nb == 0xff) {
+		items_raw = data;
+		items_raw_length = data_length;
+	}
+	// do callback
+	result = 0;
+	switch (tag_id) {
+	case TAG_MENU_LAST:
+	{
+		en50221_app_mmi_menu_callback cb = mmi->menucallback;
+		void *cb_arg = mmi->menucallback_arg;
+		pthread_mutex_unlock(&mmi->lock);
+		if (cb) {
+			result =
+				cb(cb_arg, slot_id, session_number,
+				&text_data_for_user[0],
+				&text_data_for_user[1],
+				&text_data_for_user[2],
+				text_count - 3, text_ptr,
+				items_raw_length, items_raw);
+		}
+		break;
+	}
+
+	case TAG_LIST_LAST:
+	{
+		en50221_app_mmi_list_callback cb = mmi->listcallback;
+		void *cb_arg = mmi->listcallback_arg;
+		pthread_mutex_unlock(&mmi->lock);
+		if (cb) {
+			result =
+				cb(cb_arg, slot_id, session_number,
+				&text_data_for_user[0],
+				&text_data_for_user[1],
+				&text_data_for_user[2],
+				text_count - 3, text_ptr,
+				items_raw_length, items_raw);
+		}
+		break;
+	}
+
+	default:
+		pthread_mutex_unlock(&mmi->lock);
+		break;
+	}
+
+exit_cleanup:
+	if ((dfstatus == 2) && outdata)
+		free(outdata);
+	if (text_flags && text_data) {
+		for (i = 0; i < text_count; i++) {
+			if ((text_flags[i] == 2) && text_data[i].text) {
+				free(text_data[i].text);
+			}
+		}
+	}
+	return result;
+}
+
+static int en50221_app_mmi_parse_subtitle(struct en50221_app_mmi *mmi,
+					  uint8_t slot_id,
+					  uint16_t session_number,
+					  uint32_t tag_id, int more_last,
+					  uint8_t * data,
+					  uint32_t data_length)
+{
+	// first of all, decode the length field
+	uint16_t asn_data_length;
+	int length_field_len;
+	if ((length_field_len = asn_1_decode(&asn_data_length, data, data_length)) < 0) {
+		print(LOG_LEVEL, ERROR, 1, "ASN.1 decode error\n");
+		return -1;
+	}
+	// check it
+	if (asn_data_length > (data_length - length_field_len)) {
+		print(LOG_LEVEL, ERROR, 1, "Received short data\n");
+		return -1;
+	}
+	// skip over the length field
+	data += length_field_len;
+
+	// defragment
+	pthread_mutex_lock(&mmi->lock);
+	uint8_t *outdata;
+	uint32_t outdata_length;
+	int dfstatus =
+	    en50221_app_mmi_defragment(mmi, session_number, tag_id,
+				       more_last,
+				       data, asn_data_length,
+				       &outdata, &outdata_length);
+	if (dfstatus <= 0) {
+		pthread_mutex_unlock(&mmi->lock);
+		return dfstatus;
+	}
+	// do callback
+	int cbstatus = 0;
+	switch (tag_id) {
+	case TAG_SUBTITLE_SEGMENT_LAST:
+		{
+			en50221_app_mmi_subtitle_segment_callback cb =
+			    mmi->subtitlesegmentcallback;
+			void *cb_arg = mmi->subtitlesegmentcallback_arg;
+			pthread_mutex_unlock(&mmi->lock);
+			if (cb) {
+				cbstatus =
+				    cb(cb_arg, slot_id, session_number, outdata, outdata_length);
+			}
+			break;
+		}
+
+	case TAG_SUBTITLE_DOWNLOAD_LAST:
+		{
+			en50221_app_mmi_subtitle_download_callback cb =
+			    mmi->subtitledownloadcallback;
+			void *cb_arg = mmi->subtitledownloadcallback_arg;
+			pthread_mutex_unlock(&mmi->lock);
+			if (cb) {
+				cbstatus =
+				    cb(cb_arg, slot_id, session_number, outdata, outdata_length);
+			}
+			break;
+		}
+	}
+
+	// free the data returned by the defragment call if asked to
+	if (dfstatus == 2) {
+		free(outdata);
+	}
+	// done
+	return cbstatus;
+}
+
+static int en50221_app_mmi_parse_scene_end_mark(struct en50221_app_mmi *mmi,
+						uint8_t slot_id,
+						uint16_t session_number,
+						uint8_t * data,
+						uint32_t data_length)
+{
+	// validate data
+	if (data_length != 2) {
+		print(LOG_LEVEL, ERROR, 1, "Received short data\n");
+		return -1;
+	}
+	if (data[0] != 1) {
+		print(LOG_LEVEL, ERROR, 1, "Received short data\n");
+		return -1;
+	}
+	uint8_t flags = data[1];
+
+	// tell the app
+	pthread_mutex_lock(&mmi->lock);
+	en50221_app_mmi_scene_end_mark_callback cb =
+	    mmi->sceneendmarkcallback;
+	void *cb_arg = mmi->sceneendmarkcallback_arg;
+	pthread_mutex_unlock(&mmi->lock);
+	if (cb) {
+		return cb(cb_arg, slot_id, session_number,
+			  (flags & 0x80) ? 1 : 0,
+			  (flags & 0x40) ? 1 : 0,
+			  (flags & 0x20) ? 1 : 0, flags & 0x0f);
+	}
+	return 0;
+}
+
+static int en50221_app_mmi_parse_scene_control(struct en50221_app_mmi *mmi,
+					       uint8_t slot_id,
+					       uint16_t session_number,
+					       uint8_t * data,
+					       uint32_t data_length)
+{
+	// validate data
+	if (data_length != 2) {
+		print(LOG_LEVEL, ERROR, 1, "Received short data\n");
+		return -1;
+	}
+	if (data[0] != 1) {
+		print(LOG_LEVEL, ERROR, 1, "Received short data\n");
+		return -1;
+	}
+	uint8_t flags = data[1];
+
+	// tell the app
+	pthread_mutex_lock(&mmi->lock);
+	en50221_app_mmi_scene_control_callback cb = mmi->scenecontrolcallback;
+	void *cb_arg = mmi->scenecontrolcallback_arg;
+	pthread_mutex_unlock(&mmi->lock);
+	if (cb) {
+		return cb(cb_arg, slot_id, session_number,
+			  (flags & 0x80) ? 1 : 0,
+			  (flags & 0x40) ? 1 : 0, flags & 0x0f);
+	}
+	return 0;
+}
+
+static int en50221_app_mmi_parse_flush_download(struct en50221_app_mmi *mmi,
+						uint8_t slot_id,
+						uint16_t session_number,
+						uint8_t *data,
+						uint32_t data_length)
+{
+	// validate data
+	if (data_length != 1) {
+		print(LOG_LEVEL, ERROR, 1, "Received short data\n");
+		return -1;
+	}
+	if (data[0] != 0) {
+		print(LOG_LEVEL, ERROR, 1, "Received short data\n");
+		return -1;
+	}
+	// tell the app
+	pthread_mutex_lock(&mmi->lock);
+	en50221_app_mmi_flush_download_callback cb = mmi->flushdownloadcallback;
+	void *cb_arg = mmi->flushdownloadcallback_arg;
+	pthread_mutex_unlock(&mmi->lock);
+	if (cb) {
+		return cb(cb_arg, slot_id, session_number);
+	}
+	return 0;
+}
+
+static int en50221_app_mmi_defragment(struct en50221_app_mmi *mmi,
+				      uint16_t session_number,
+				      uint32_t tag_id,
+				      int more_last,
+				      uint8_t * indata,
+				      uint32_t indata_length,
+				      uint8_t ** outdata,
+				      uint32_t * outdata_length)
+{
+	struct en50221_app_mmi_session *cur_s = mmi->sessions;
+	while (cur_s) {
+		if (cur_s->session_number == session_number)
+			break;
+		cur_s = cur_s->next;
+	}
+
+	// more data is still to come
+	if (!more_last) {
+		// if there was no previous session, create one
+		if (cur_s == NULL) {
+			cur_s = malloc(sizeof(struct en50221_app_mmi_session));
+			if (cur_s == NULL) {
+				print(LOG_LEVEL, ERROR, 1, "Ran out of memory\n");
+				return -1;
+			}
+			cur_s->session_number = session_number;
+			cur_s->menu_block_chain = NULL;
+			cur_s->menu_block_length = 0;
+			cur_s->list_block_chain = NULL;
+			cur_s->list_block_length = 0;
+			cur_s->subtitlesegment_block_chain = NULL;
+			cur_s->subtitlesegment_block_length = 0;
+			cur_s->subtitledownload_block_chain = NULL;
+			cur_s->subtitledownload_block_length = 0;
+			cur_s->next = mmi->sessions;
+			mmi->sessions = cur_s;
+		}
+		// find the block/block_length to use
+		uint8_t **block_chain;
+		uint32_t *block_length;
+		switch (tag_id) {
+		case TAG_MENU_LAST:
+		case TAG_MENU_MORE:
+			block_chain = &cur_s->menu_block_chain;
+			block_length = &cur_s->menu_block_length;
+			break;
+		case TAG_LIST_LAST:
+		case TAG_LIST_MORE:
+			block_chain = &cur_s->list_block_chain;
+			block_length = &cur_s->list_block_length;
+			break;
+		case TAG_SUBTITLE_SEGMENT_LAST:
+		case TAG_SUBTITLE_SEGMENT_MORE:
+			block_chain = &cur_s->subtitlesegment_block_chain;
+			block_length = &cur_s->subtitlesegment_block_length;
+			break;
+		case TAG_SUBTITLE_DOWNLOAD_LAST:
+		case TAG_SUBTITLE_DOWNLOAD_MORE:
+			block_chain = &cur_s->subtitledownload_block_chain;
+			block_length = &cur_s->subtitledownload_block_length;
+			break;
+		default:
+			return -1;
+		}
+
+		// append the data
+		uint8_t *new_data =
+		    realloc(*block_chain, *block_length + indata_length);
+		if (new_data == NULL) {
+			print(LOG_LEVEL, ERROR, 1, "Ran out of memory\n");
+			return -1;
+		}
+		memcpy(new_data + *block_length, indata, indata_length);
+		*block_chain = new_data;
+		*block_length += indata_length;
+
+		// success, but block not complete yet
+		return 0;
+	}
+	// we hit the last of a possible chain of fragments
+	if (cur_s != NULL) {
+		// find the block/block_length to use
+		uint8_t **block_chain;
+		uint32_t *block_length;
+		switch (tag_id) {
+		case TAG_MENU_LAST:
+		case TAG_MENU_MORE:
+			block_chain = &cur_s->menu_block_chain;
+			block_length = &cur_s->menu_block_length;
+			break;
+		case TAG_LIST_LAST:
+		case TAG_LIST_MORE:
+			block_chain = &cur_s->list_block_chain;
+			block_length = &cur_s->list_block_length;
+			break;
+		case TAG_SUBTITLE_SEGMENT_LAST:
+		case TAG_SUBTITLE_SEGMENT_MORE:
+			block_chain = &cur_s->subtitlesegment_block_chain;
+			block_length = &cur_s->subtitlesegment_block_length;
+			break;
+		case TAG_SUBTITLE_DOWNLOAD_LAST:
+		case TAG_SUBTITLE_DOWNLOAD_MORE:
+			block_chain = &cur_s->subtitledownload_block_chain;
+			block_length = &cur_s->subtitledownload_block_length;
+			break;
+		default:
+			return -1;
+		}
+
+		// we have a preceding fragment - need to append
+		uint8_t *new_data =
+		    realloc(*block_chain, *block_length + indata_length);
+		if (new_data == NULL) {
+			print(LOG_LEVEL, ERROR, 1, "Ran out of memory\n");
+			return -1;
+		}
+		memcpy(new_data + *block_length, indata, indata_length);
+		*outdata_length = *block_length + indata_length;
+		*outdata = new_data;
+		*block_chain = NULL;
+		*block_length = 0;
+
+		// success, and indicate to free the block when done
+		return 2;
+	}
+	// success, but indicate it is not to be freed
+	*outdata_length = indata_length;
+	*outdata = indata;
+	return 1;
+}
+
+static int en50221_app_mmi_defragment_text(uint8_t * data,
+					   uint32_t data_length,
+					   uint8_t ** outdata,
+					   uint32_t * outdata_length,
+					   uint32_t * outconsumed)
+{
+	uint8_t *text = NULL;
+	uint32_t text_length = 0;
+	uint32_t consumed = 0;
+
+	while (1) {
+		// get the tag
+		if (data_length < 3) {
+			print(LOG_LEVEL, ERROR, 1, "Short data\n");
+			if (text)
+				free(text);
+			return -1;
+		}
+		uint32_t tag = (data[0] << 16) | (data[1] << 8) | data[2];
+		data += 3;
+		data_length -= 3;
+		consumed += 3;
+
+		// get the length of the data and adjust
+		uint16_t asn_data_length;
+		int length_field_len;
+		if ((length_field_len =
+		     asn_1_decode(&asn_data_length, data,
+				  data_length)) < 0) {
+			print(LOG_LEVEL, ERROR, 1, "ASN.1 decode error\n");
+			if (text)
+				free(text);
+			return -1;
+		}
+		data += length_field_len;
+		data_length -= length_field_len;
+		consumed += length_field_len;
+
+		// deal with the tags
+		if (tag == TAG_TEXT_LAST) {
+			if (text == NULL) {
+				*outdata = data;
+				*outdata_length = asn_data_length;
+				*outconsumed = consumed + asn_data_length;
+				return 1;
+			} else {
+				// append the data
+				uint8_t *new_text = realloc(text,
+							    text_length + asn_data_length);
+				if (new_text == NULL) {
+					print(LOG_LEVEL, ERROR, 1,
+					      "Ran out of memory\n");
+					if (text)
+						free(text);
+					return -1;
+				}
+				memcpy(new_text + text_length, data,
+				       asn_data_length);
+				*outdata = new_text;
+				*outdata_length =
+				    text_length + asn_data_length;
+				*outconsumed = consumed + asn_data_length;
+				return 2;
+			}
+
+		} else if (tag == TAG_TEXT_MORE) {
+			// append the data
+			uint8_t *new_text =
+			    realloc(text, text_length + asn_data_length);
+			if (new_text == NULL) {
+				print(LOG_LEVEL, ERROR, 1,
+				      "Ran out of memory\n");
+				if (text)
+					free(text);
+				return -1;
+			}
+			memcpy(new_text + text_length, data,
+			       asn_data_length);
+			text = new_text;
+			text_length += asn_data_length;
+
+			// consume the data
+			data += asn_data_length;
+			data_length -= asn_data_length;
+			consumed += asn_data_length;
+		} else {
+			// unknown tag
+			print(LOG_LEVEL, ERROR, 1,
+			      "Unknown MMI text tag\n");
+			if (text)
+				free(text);
+			return -1;
+		}
+	}
+}