petermcs
165 lines
6.0 KiB
C
165 lines
6.0 KiB
C
/*####COPYRIGHTBEGIN####
|
||
-------------------------------------------
|
||
Copyright (C) 2009 Peter Mc Shane
|
||
|
||
This program is free software; you can redistribute it and/or
|
||
modify it under the terms of the GNU General Public License
|
||
as published by the Free Software Foundation; either version 2
|
||
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 General Public License for more details.
|
||
|
||
You should have received a copy of the GNU General Public License
|
||
along with this program; if not, write to:
|
||
The Free Software Foundation, Inc.
|
||
59 Temple Place - Suite 330
|
||
Boston, MA 02111-1307, USA.
|
||
|
||
As a special exception, if other files instantiate templates or
|
||
use macros or inline functions from this file, or you compile
|
||
this file and link it with other works to produce a work based
|
||
on this file, this file does not by itself cause the resulting
|
||
work to be covered by the GNU General Public License. However
|
||
the source code for this file must still be made available in
|
||
accordance with section (3) of the GNU General Public License.
|
||
|
||
This exception does not invalidate any other reasons why a work
|
||
based on this file might be covered by the GNU General Public
|
||
License.
|
||
-------------------------------------------
|
||
####COPYRIGHTEND####*/
|
||
#ifndef READRANGE_H
|
||
#define READRANGE_H
|
||
|
||
#include "bacstr.h"
|
||
#include "datetime.h"
|
||
|
||
struct BACnet_Read_Range_Data;
|
||
typedef struct BACnet_Read_Range_Data {
|
||
BACNET_OBJECT_TYPE object_type;
|
||
uint32_t object_instance;
|
||
BACNET_PROPERTY_ID object_property;
|
||
uint32_t array_index;
|
||
uint8_t *application_data;
|
||
int application_data_len;
|
||
BACNET_BIT_STRING ResultFlags; /* FIRST_ITEM, LAST_ITEM, MORE_ITEMS */
|
||
int RequestType; /* Index, sequence or time based request */
|
||
int Overhead; /* How much space the baggage takes in the response */
|
||
uint32_t ItemCount;
|
||
uint32_t FirstSequence;
|
||
union { /* Pick the appropriate data type */
|
||
uint32_t RefIndex;
|
||
uint32_t RefSeqNum;
|
||
BACNET_DATE_TIME RefTime;
|
||
} Range;
|
||
int32_t Count; /* SIGNED value as +ve vs -ve is important */
|
||
BACNET_ERROR_CLASS error_class;
|
||
BACNET_ERROR_CODE error_code;
|
||
} BACNET_READ_RANGE_DATA;
|
||
|
||
/* Defines to indicate which type of read range request it is
|
||
Not really a bit map but we do it like this to allow quick
|
||
checking of request against capabilities for the property */
|
||
|
||
#define RR_BY_POSITION 1
|
||
#define RR_BY_SEQUENCE 2
|
||
#define RR_BY_TIME 4
|
||
#define RR_READ_ALL 8 /* Read all of array - so don't send any range in the request */
|
||
#define RR_ARRAY_OF_LISTS 16 /* For info functionality indicates array of lists if set */
|
||
|
||
/* Bit String Enumerations */
|
||
typedef enum {
|
||
RESULT_FLAG_FIRST_ITEM = 0,
|
||
RESULT_FLAG_LAST_ITEM = 1,
|
||
RESULT_FLAG_MORE_ITEMS = 2
|
||
} BACNET_RESULT_FLAGS;
|
||
|
||
/* Defines for ReadRange packet overheads to allow us to determine how
|
||
* much space is left for actual payload:
|
||
*
|
||
* Overhead is comprised of:
|
||
* 1. PDU Type + invoke ID + service type = 3 bytes
|
||
* 2. Object ID = 5 bytes
|
||
* 3. Object Property = 2 bytes if property is 0-255, 3 if property is
|
||
* 256-65535 – theoretical max of 5 bytes but how likely is that?
|
||
* 4. Optional array index = 2 bytes if index is 0-255, 3 if index is
|
||
* 256-65535 – theoretical max of 5 bytes but how likely is that?
|
||
* 5. Flags = 3 bytes
|
||
* 6. Opening and closing tag for data = 2 bytes
|
||
* 7. firstSequenceNumber [6] Unsigned32 OPTIONAL -- used only if 'Item Count' > 0
|
||
* and the request was either of type 'By Sequence Number' or 'By Time'
|
||
* = minimum of 2 bytes, maximum of 5 bytes.
|
||
*
|
||
* These figures give an absolute worst-case overhead of 28 bytes. A less
|
||
* conservative value (if we assume object property is 3 bytes and array
|
||
* index is 3 bytes) is 24. */
|
||
|
||
/* This is the fixed part of the overhead before we check for array and
|
||
* first sequence number requirements. again if you are really paranoid
|
||
* use a value of 18 */
|
||
|
||
#define RR_OVERHEAD 16
|
||
#define RR_1ST_SEQ_OVERHEAD 5
|
||
#define RR_INDEX_OVERHEAD 3 /* or 5 if paranoid */
|
||
|
||
/* Define pointer to function type for handling ReadRange request.
|
||
This function will take the following parameters:
|
||
1. A pointer to a buffer of at least MAX_APDU bytes to build the response in.
|
||
2. A pointer to a BACNET_READ_RANGE_DATA structure with all the request
|
||
information in it. The function is responsible for applying the request
|
||
to the property in question and returning the response. */
|
||
|
||
typedef int (*rr_handler_function) (
|
||
uint8_t *apdu,
|
||
BACNET_READ_RANGE_DATA *pRequest);
|
||
|
||
/* Structure to return the type of requests a given object property can
|
||
* accept and the address of the function to handle the request */
|
||
|
||
typedef struct rrpropertyinfo {
|
||
int RequestTypes;
|
||
rr_handler_function Handler;
|
||
} RR_PROP_INFO;
|
||
|
||
/* Function pointer for ReadRange information retrieval function */
|
||
|
||
typedef bool (*rr_info_function) (
|
||
uint32_t Object, /* Which particular object instance (we know the type implicetly) */
|
||
BACNET_PROPERTY_ID Property, /* Which property */
|
||
RR_PROP_INFO *pInfo, /* Where to write the response to */
|
||
BACNET_ERROR_CLASS *error_class, /* Somewhere to write error responses to */
|
||
BACNET_ERROR_CODE *error_code);
|
||
|
||
typedef rr_info_function (*get_rr_info_fn) (
|
||
BACNET_OBJECT_TYPE object_type);
|
||
|
||
int rr_encode_apdu(
|
||
uint8_t * apdu,
|
||
uint8_t invoke_id,
|
||
BACNET_READ_RANGE_DATA * rrdata);
|
||
|
||
int rr_decode_service_request(
|
||
uint8_t * apdu,
|
||
unsigned apdu_len,
|
||
BACNET_READ_RANGE_DATA * rrdata);
|
||
|
||
int rr_ack_encode_apdu(
|
||
uint8_t * apdu,
|
||
uint8_t invoke_id,
|
||
BACNET_READ_RANGE_DATA * rrdata);
|
||
|
||
int rr_ack_decode_service_request(
|
||
uint8_t * apdu,
|
||
int apdu_len, /* total length of the apdu */
|
||
BACNET_READ_RANGE_DATA * rrdata);
|
||
|
||
uint8_t Send_ReadRange_Request(
|
||
uint32_t device_id, /* destination device */
|
||
BACNET_READ_RANGE_DATA * read_access_data);
|
||
|
||
#endif
|
||
|