Imported Upstream version 1.1.1+rev1207upstream/1.1.1+rev1207

1 files changed, 533 insertions, 0 deletions

diff --git a/lib/libdvben50221/en50221_app_lowspeed.c b/lib/libdvben50221/en50221_app_lowspeed.c
new file mode 100644
index 0000000..a66598a
--- /dev/null
+++ b/lib/libdvben50221/en50221_app_lowspeed.c
@@ -0,0 +1,533 @@
+/*
+    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 "en50221_app_lowspeed.h"
+#include "en50221_app_tags.h"
+#include "asn_1.h"
+
+struct en50221_app_lowspeed_session {
+	uint16_t session_number;
+	uint8_t *block_chain;
+	uint32_t block_length;
+
+	struct en50221_app_lowspeed_session *next;
+};
+
+struct en50221_app_lowspeed {
+	struct en50221_app_send_functions *funcs;
+
+	en50221_app_lowspeed_command_callback command_callback;
+	void *command_callback_arg;
+
+	en50221_app_lowspeed_send_callback send_callback;
+	void *send_callback_arg;
+
+	struct en50221_app_lowspeed_session *sessions;
+
+	pthread_mutex_t lock;
+};
+
+static int en50221_app_lowspeed_parse_connect_on_channel(struct en50221_app_lowspeed_command *command,
+							 uint8_t *data,
+							 int data_length);
+static int en50221_app_lowspeed_parse_command(struct en50221_app_lowspeed *lowspeed,
+					      uint8_t slot_id,
+					      uint16_t session_number,
+					      uint8_t *data,
+					      uint32_t data_length);
+static int en50221_app_lowspeed_parse_send(struct en50221_app_lowspeed *lowspeed,
+					   uint8_t slot_id,
+					   uint16_t session_number,
+					   int more_last,
+					   uint8_t *data,
+					   uint32_t data_length);
+
+
+
+struct en50221_app_lowspeed *en50221_app_lowspeed_create(struct en50221_app_send_functions *funcs)
+{
+	struct en50221_app_lowspeed *lowspeed = NULL;
+
+	// create structure and set it up
+	lowspeed = malloc(sizeof(struct en50221_app_lowspeed));
+	if (lowspeed == NULL) {
+		return NULL;
+	}
+	lowspeed->funcs = funcs;
+	lowspeed->command_callback = NULL;
+	lowspeed->send_callback = NULL;
+	lowspeed->sessions = NULL;
+
+	pthread_mutex_init(&lowspeed->lock, NULL);
+
+	// done
+	return lowspeed;
+}
+
+void en50221_app_lowspeed_destroy(struct en50221_app_lowspeed *lowspeed)
+{
+	struct en50221_app_lowspeed_session *cur_s = lowspeed->sessions;
+	while (cur_s) {
+		struct en50221_app_lowspeed_session *next = cur_s->next;
+		if (cur_s->block_chain)
+			free(cur_s->block_chain);
+		free(cur_s);
+		cur_s = next;
+	}
+
+	pthread_mutex_destroy(&lowspeed->lock);
+	free(lowspeed);
+}
+
+void en50221_app_lowspeed_clear_session(struct en50221_app_lowspeed *lowspeed,
+					uint16_t session_number)
+{
+	pthread_mutex_lock(&lowspeed->lock);
+	struct en50221_app_lowspeed_session *cur_s = lowspeed->sessions;
+	struct en50221_app_lowspeed_session *prev_s = NULL;
+	while (cur_s) {
+		if (cur_s->session_number == session_number) {
+			if (cur_s->block_chain)
+				free(cur_s->block_chain);
+			if (prev_s) {
+				prev_s->next = cur_s->next;
+			} else {
+				lowspeed->sessions = cur_s->next;
+			}
+			free(cur_s);
+			return;
+		}
+
+		prev_s = cur_s;
+		cur_s = cur_s->next;
+	}
+	pthread_mutex_unlock(&lowspeed->lock);
+}
+
+void en50221_app_lowspeed_register_command_callback(struct en50221_app_lowspeed *lowspeed,
+						    en50221_app_lowspeed_command_callback callback,
+						    void *arg)
+{
+	pthread_mutex_lock(&lowspeed->lock);
+	lowspeed->command_callback = callback;
+	lowspeed->command_callback_arg = arg;
+	pthread_mutex_unlock(&lowspeed->lock);
+}
+
+void en50221_app_lowspeed_register_send_callback(struct en50221_app_lowspeed *lowspeed,
+						 en50221_app_lowspeed_send_callback callback,
+						 void *arg)
+{
+	pthread_mutex_lock(&lowspeed->lock);
+	lowspeed->send_callback = callback;
+	lowspeed->send_callback_arg = arg;
+	pthread_mutex_unlock(&lowspeed->lock);
+}
+
+int en50221_app_lowspeed_send_comms_reply(struct en50221_app_lowspeed *lowspeed,
+					  uint16_t session_number,
+					  uint8_t comms_reply_id,
+					  uint8_t return_value)
+{
+	uint8_t data[6];
+
+	data[0] = (TAG_COMMS_REPLY >> 16) & 0xFF;
+	data[1] = (TAG_COMMS_REPLY >> 8) & 0xFF;
+	data[2] = TAG_COMMS_REPLY & 0xFF;
+	data[3] = 2;
+	data[4] = comms_reply_id;
+	data[5] = return_value;
+	return lowspeed->funcs->send_data(lowspeed->funcs->arg,
+					  session_number, data, 6);
+}
+
+int en50221_app_lowspeed_send_comms_data(struct en50221_app_lowspeed *lowspeed,
+					 uint16_t session_number,
+					 uint8_t phase_id,
+					 uint32_t tx_data_length,
+					 uint8_t * tx_data)
+{
+	uint8_t buf[10];
+
+	// the spec defines this limit
+	if (tx_data_length > 254) {
+		return -1;
+	}
+	// set up the tag
+	buf[0] = (TAG_COMMS_RECV_LAST >> 16) & 0xFF;
+	buf[1] = (TAG_COMMS_RECV_LAST >> 8) & 0xFF;
+	buf[2] = TAG_COMMS_RECV_LAST & 0xFF;
+
+	// encode the length field
+	int length_field_len;
+	if ((length_field_len = asn_1_encode(tx_data_length + 1, buf + 3, 3)) < 0) {
+		return -1;
+	}
+	// the phase_id
+	buf[3 + length_field_len] = phase_id;
+
+	// build the iovecs
+	struct iovec iov[2];
+	iov[0].iov_base = buf;
+	iov[0].iov_len = 3 + length_field_len + 1;
+	iov[1].iov_base = tx_data;
+	iov[1].iov_len = tx_data_length;
+
+	// create the data and send it
+	return lowspeed->funcs->send_datav(lowspeed->funcs->arg,
+					   session_number, iov, 2);
+}
+
+int en50221_app_lowspeed_message(struct en50221_app_lowspeed *lowspeed,
+				 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_COMMS_COMMAND:
+		return en50221_app_lowspeed_parse_command(lowspeed,
+							  slot_id,
+							  session_number,
+							  data + 3,
+							  data_length - 3);
+	case TAG_COMMS_SEND_LAST:
+		return en50221_app_lowspeed_parse_send(lowspeed, slot_id,
+						       session_number, 1,
+						       data + 3,
+						       data_length - 3);
+	case TAG_COMMS_SEND_MORE:
+		return en50221_app_lowspeed_parse_send(lowspeed, slot_id,
+						       session_number, 0,
+						       data + 3,
+						       data_length - 3);
+	}
+
+	print(LOG_LEVEL, ERROR, 1, "Received unexpected tag %x\n", tag);
+	return -1;
+}
+
+
+
+static int en50221_app_lowspeed_parse_connect_on_channel(struct en50221_app_lowspeed_command *command,
+							 uint8_t *data,
+							 int data_length)
+{
+	if (data_length < 3) {
+		print(LOG_LEVEL, ERROR, 1, "Received short data\n");
+		return -1;
+	}
+	// check the tag
+	uint32_t tag = (data[0] << 16) | (data[1] << 8) | data[2];
+	if (tag != TAG_CONNECTION_DESCRIPTOR) {
+		print(LOG_LEVEL, ERROR, 1,
+		      "Received bad CONNECT_ON_CHANNEL\n");
+		return -1;
+	}
+	data += 3;
+	data_length -= 3;
+
+	// parse the descriptor-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;
+	}
+	data += length_field_len;
+	data_length -= length_field_len;
+
+	// check length field
+	if (asn_data_length > data_length) {
+		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;
+	}
+	// get the descriptor type
+	command->u.connect_on_channel.descriptor_type = data[0];
+	data++;
+	data_length--;
+	asn_data_length--;
+
+	// deal with the descriptor itself
+	switch (command->u.connect_on_channel.descriptor_type) {
+	case CONNECTION_DESCRIPTOR_TYPE_TELEPHONE:
+	{
+		// get the raw descriptor and validate length
+		struct descriptor *d = (struct descriptor *) data;
+		if (asn_data_length < 2) {
+			print(LOG_LEVEL, ERROR, 1,
+				"Received short data\n");
+			return -1;
+		}
+		if (asn_data_length != (2 + d->len)) {
+			print(LOG_LEVEL, ERROR, 1,
+				"Received short data\n");
+			return -1;
+		}
+		if (d->tag != dtag_dvb_telephone) {
+			print(LOG_LEVEL, ERROR, 1,
+				"Received invalid telephone descriptor\n");
+			return -1;
+		}
+		// parse the telephone descriptor
+		command->u.connect_on_channel.descriptor.telephone = dvb_telephone_descriptor_codec(d);
+		if (command->u.connect_on_channel.descriptor.telephone == NULL) {
+			print(LOG_LEVEL, ERROR, 1,
+				"Received invalid telephone descriptor\n");
+			return -1;
+		}
+		data += 2 + d->len;
+		data_length -= 2 + d->len;
+		break;
+	}
+
+	case CONNECTION_DESCRIPTOR_TYPE_CABLE:
+		if (asn_data_length != 1) {
+			print(LOG_LEVEL, ERROR, 1,
+			      "Received short data\n");
+			return -1;
+		}
+		command->u.connect_on_channel.descriptor.cable_channel_id = data[0];
+		data++;
+		data_length--;
+		break;
+	default:
+		print(LOG_LEVEL, ERROR, 1,
+		      "Received unknown connection descriptor %02x\n",
+		      command->u.connect_on_channel.descriptor_type);
+		return -1;
+	}
+
+	// parse the last bit
+	if (data_length != 2) {
+		print(LOG_LEVEL, ERROR, 1, "Received short data\n");
+		return -1;
+	}
+	command->u.connect_on_channel.retry_count = data[0];
+	command->u.connect_on_channel.timeout = data[1];
+
+	// ok
+	return 0;
+}
+
+static int en50221_app_lowspeed_parse_command(struct en50221_app_lowspeed *lowspeed,
+					      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 < 1) {
+		print(LOG_LEVEL, ERROR, 1, "Received short data\n");
+		return -1;
+	}
+	if (asn_data_length > (data_length - length_field_len)) {
+		print(LOG_LEVEL, ERROR, 1, "Received short data\n");
+		return -1;
+	}
+	data += length_field_len;
+
+	// get command id
+	uint8_t command_id = data[0];
+	data++;
+	asn_data_length--;
+
+	// parse the command
+	struct en50221_app_lowspeed_command command;
+	switch (command_id) {
+	case COMMS_COMMAND_ID_CONNECT_ON_CHANNEL:
+		if (en50221_app_lowspeed_parse_connect_on_channel
+		    (&command, data, asn_data_length)) {
+			return -1;
+		}
+		break;
+	case COMMS_COMMAND_ID_SET_PARAMS:
+		if (asn_data_length != 2) {
+			print(LOG_LEVEL, ERROR, 1,
+			      "Received short data\n");
+			return -1;
+		}
+		command.u.set_params.buffer_size = data[0];
+		command.u.set_params.timeout = data[1];
+		break;
+	case COMMS_COMMAND_ID_GET_NEXT_BUFFER:
+		if (asn_data_length != 1) {
+			print(LOG_LEVEL, ERROR, 1,
+			      "Received short data\n");
+			return -1;
+		}
+		command.u.get_next_buffer.phase_id = data[0];
+		break;
+
+	case COMMS_COMMAND_ID_DISCONNECT_ON_CHANNEL:
+	case COMMS_COMMAND_ID_ENQUIRE_STATUS:
+		break;
+
+	default:
+		print(LOG_LEVEL, ERROR, 1,
+		      "Received unexpected command_id %02x\n", command_id);
+		return -1;
+	}
+
+	// tell the app
+	pthread_mutex_lock(&lowspeed->lock);
+	en50221_app_lowspeed_command_callback cb = lowspeed->command_callback;
+	void *cb_arg = lowspeed->command_callback_arg;
+	pthread_mutex_unlock(&lowspeed->lock);
+	if (cb) {
+		return cb(cb_arg, slot_id, session_number, command_id,
+			  &command);
+	}
+	return 0;
+}
+
+static int en50221_app_lowspeed_parse_send(struct en50221_app_lowspeed *lowspeed,
+					   uint8_t slot_id,
+					   uint16_t session_number,
+					   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;
+
+	// find previous session
+	pthread_mutex_lock(&lowspeed->lock);
+	struct en50221_app_lowspeed_session *cur_s = lowspeed->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_lowspeed_session));
+			if (cur_s == NULL) {
+				print(LOG_LEVEL, ERROR, 1,
+				      "Ran out of memory\n");
+				pthread_mutex_unlock(&lowspeed->lock);
+				return -1;
+			}
+			cur_s->session_number = session_number;
+			cur_s->block_chain = NULL;
+			cur_s->block_length = 0;
+			cur_s->next = lowspeed->sessions;
+			lowspeed->sessions = cur_s;
+		}
+		// append the data
+		uint8_t *new_data = realloc(cur_s->block_chain,
+					    cur_s->block_length + asn_data_length);
+		if (new_data == NULL) {
+			print(LOG_LEVEL, ERROR, 1, "Ran out of memory\n");
+			pthread_mutex_unlock(&lowspeed->lock);
+			return -1;
+		}
+		memcpy(new_data + cur_s->block_length, data, asn_data_length);
+		cur_s->block_chain = new_data;
+		cur_s->block_length += asn_data_length;
+
+		// done
+		pthread_mutex_unlock(&lowspeed->lock);
+		return 0;
+	}
+	// we hit the last of a possible chain of fragments
+	int do_free = 0;
+	if (cur_s != NULL) {
+		// we have a preceding fragment - need to append
+		uint8_t *new_data = realloc(cur_s->block_chain,
+					    cur_s->block_length + asn_data_length);
+		if (new_data == NULL) {
+			print(LOG_LEVEL, ERROR, 1, "Ran out of memory\n");
+			pthread_mutex_unlock(&lowspeed->lock);
+			return -1;
+		}
+		memcpy(new_data + cur_s->block_length, data, asn_data_length);
+		asn_data_length = cur_s->block_length + asn_data_length;
+		data = new_data;
+		cur_s->block_chain = NULL;
+		cur_s->block_length = 0;
+		do_free = 1;
+	}
+	// check the reassembled data length
+	if (asn_data_length < 1) {
+		pthread_mutex_unlock(&lowspeed->lock);
+		print(LOG_LEVEL, ERROR, 1, "Received short data\n");
+		if (do_free)
+			free(data);
+		return -1;
+	}
+	// now, parse the data
+	uint8_t phase_id = data[0];
+
+	// tell the app
+	en50221_app_lowspeed_send_callback cb = lowspeed->send_callback;
+	void *cb_arg = lowspeed->send_callback_arg;
+	pthread_mutex_unlock(&lowspeed->lock);
+	int cbstatus = 0;
+	if (cb) {
+		cbstatus =
+		    cb(cb_arg, slot_id, session_number, phase_id, data + 1, asn_data_length - 1);
+	}
+	// done
+	if (do_free)
+		free(data);
+	return cbstatus;
+}