Osmocom Packet control Unit (PCU): Network-side GPRS (RLC/MAC); BTS- or BSC-colocated https://osmocom.org/projects/osmopcu
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osmo-pcu/src/csn1.h

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/* csn1.h
* Declarations and types for CSN1 dissection in wireshark.
* By Vincent Helfre, based on original code by Jari Sassi
* with the gracious authorization of STE
* Copyright (c) 2011 ST-Ericsson
*
* $Id: packet-csn1.h 36306 2011-03-24 09:20:14Z etxrab $
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* 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.
*/
#ifndef _PACKET_CSN1_H_
#define _PACKET_CSN1_H_
#include <osmocom/core/bitvec.h>
#include "wireshark_compat.h"
/* Error codes */
#define CSN_OK 0
#define CSN_ERROR_GENERAL -1
#define CSN_ERROR_DATA_NOT_VALID -2
#define CSN_ERROR_IN_SCRIPT -3
#define CSN_ERROR_INVALID_UNION_INDEX -4
#define CSN_ERROR_NEED_MORE_BITS_TO_UNPACK -5
#define CSN_ERROR_ILLEGAL_BIT_VALUE -6
#define CSN_ERROR_INTERNAL -7
#define CSN_ERROR_STREAM_NOT_SUPPORTED -8
#define CSN_ERROR_MESSAGE_TOO_LONG -9
#define CSN_ERROR_ -10
/* CallBack return status */
typedef gint16 CSN_CallBackStatus_t;
#define CSNCBS_OK 0
#define CSNCBS_NOT_OK -10
#define CSNCBS_NOT_TO_US -11
#define CSNCBS_NOT_COMPLETE -12
#define CSNCBS_REVISION_LIMIT_STOP -20 /* Stop packing/unpacking - revision limit */
#define CSNCBS_NOT_SUPPORTED_IE -21 /* Handling of the unpacked IE is not supported by MS-software */
#ifndef ElementsOf
#define ElementsOf(array) (sizeof(array) / sizeof(array[0]))
#endif
typedef void(*void_fn_t)(void);
/* Context holding CSN1 parameters */
typedef struct
{
gint remaining_bits_len; /* IN to an csn stream operation */
gint bit_offset; /* IN/OUT to an csn stream operation */
gint direction; /* 0 - decode; 1 - encode */
} csnStream_t;
typedef gint16 (*StreamSerializeFcn_t)(csnStream_t* ar, struct bitvec *vector, unsigned *readIndex, void* data);
typedef CSN_CallBackStatus_t (*DissectorCallbackFcn_t)(struct bitvec *vector, unsigned *readIndex, void* param1, void* param2);
typedef enum
{
CSN_END = 0,
CSN_BIT,
CSN_UINT,
CSN_TYPE,
CSN_CHOICE,
CSN_UNION,
CSN_UNION_LH,
CSN_UINT_ARRAY,
CSN_TYPE_ARRAY,
CSN_BITMAP, /* Bitmap with constant: <bitmap: bit(64)> */
CSN_VARIABLE_BITMAP, /* <N: bit (5)> <bitmap: bit(N + offset)> */
CSN_VARIABLE_BITMAP_1, /* <bitmap: bit**> i.e. to the end of message (R99) */
CSN_LEFT_ALIGNED_VAR_BMP, /* As variable bitmap but the result is left aligned (R99) */
CSN_LEFT_ALIGNED_VAR_BMP_1,/* As above only size is to the end of message (R99) */
CSN_PADDING_BITS, /* Padding bits fill to the end of the buffer */
CSN_VARIABLE_ARRAY, /* Array with length specified in parameter: <N: bit(4)> <list: octet(N + offset)> */
CSN_VARIABLE_TARRAY, /* Type Array with length specified in parameter: <N: bit(x)> <Type>*N */
CSN_VARIABLE_TARRAY_OFFSET,/* As above but with offset. The offset is stored as third parameter of CSN_DESCR (descr.value) */
CSN_RECURSIVE_ARRAY, /* Recursive way to specify an array of uint: <list> ::= {1 <number: bit(4) <list>|0}; */
CSN_RECURSIVE_TARRAY, /* Recursive way to specify an array of type: <list> ::= {1 <type>} ** 0 ; */
CSN_RECURSIVE_TARRAY_1, /* same as above but first element always exist:<list> ::= <type> {1 <type>} ** 0 ; */
CSN_RECURSIVE_TARRAY_2, /* same as above but with reversed separators :<lists> ::= <type> { 0 <type> } ** 1 ; */
CSN_EXIST,
CSN_EXIST_LH,
CSN_NEXT_EXIST,
CSN_NEXT_EXIST_LH,
CSN_NULL,
CSN_FIXED,
CSN_CALLBACK,
CSN_UINT_OFFSET, /* unpack will add offset, inverse pack will subtract offset */
CSN_UINT_LH, /* Low High extraction of int */
CSN_SERIALIZE,
CSN_TRAP_ERROR
} csn_type_t;
/******************************************************************************************
* CSN_DESCR structure:
*
* type:
* This is the CSN type. All existing types are specified in the section above.
*
* i:
* Depending on the contents of the type parameter, the parameter "i" may have following meaning:
* - specifies the number of bits for the CSN_UINT or CSN_UINT_OR_NULL types
* - the offset for an array size by which the size is incremented
* for the CSN_VAR_ARRAY type
* - the length of each element of an array for the CSN_REC_ARRAY type
* - the number of the elements in an array for the CSN_TYPE_ARRAY type
* - the offset to the variable keeping the number of elements of an array for in the CSN_VAR_TARRAY type
* - the number of different data types in a union for the CSN_UNION, CSN_UNION_LH, and for the CSN_CHOICE types
* - the length in bits of the fixed number defined for the CSN_FIXED type
* - the number of lines to skip in the CSN_DESCR type specified for the CSN_NEXT_EXIST, CSN_NEXT_EXIST_LH,
* CSN_NEXT_EXIST_OR_NULL, and CSN_NEXT_EXIST_OR_NULL_LH types
* - the number of bits in a bitmap for the CSN_BITMAP type
* - the value by which the number of bits in a bitmap has to be incremented or decremented for the
* CSN_VAR_BITMAP, CSN_LEFT_VAR_BMP, and CSN_LEFT_BMP_1 types
* - the offset to param1 for the CSN_CALLBACK type
* - ERRORCODE used by the CSN_ERROR type
* - the bit-length of the LENGTH field in a CSN_SERIALISE type
*
* descr
* This parameter has different meaning depending on the value of the type parameter:
* - the offset for the CSN_UINT_OFFSET type
* - the number of the elements in an array of the CSN_UINT_ARRAY type
* - the offset to the parameter where the size of the array has to be stored for the CSN_REC_ARRAY type
* - the address of the internal structure, describing the member type (by means of the CSN_DESCR type) in the
* CSN_TYPE_ARRAY, CSN_VAR_TARRAY, and CSN_TYPE types
* - the address of the variable of type CSN_ChoiceElement_t describing all elements in the CSN_CHOICE type union
* - the offset to the variable where the number of bits has to be or is stored for the CSN_VAR_BITMAP,
* CSN_LEFT_VAR_BMP, and CSN_LEFT_BMP_1 types
* - the function number (case number) for the CSN_CALLBACK and CSN_CALLBACK_NO_ARGS types
* - the free text used by the CSN_TRAP_ERROR
*
* offset
* This is an offset to the _MEMBER parameter counting from the beginning of struct
* where the unpacked or packed value shall be stored or fetched. The meaning of the _MEMBER parameter
* varies depending on the type which is specified and so is the meaning of the offset parameter.
* Some types (and corresponding macros) do not have the _MEMBER parameter and then the offset parameter
* is not used or is different from the offset to the _MEMBER.
* - the fixed value for the CSN_FIXED type
* - an offset to the variable UnionType for CSN_UNION and CSN_UNION_LH types
* - an offset to the variable Exist for CSN_NEXT_EXIST and CSN_NEXT_EXIST_LH types
* - an offset to param2 in the CSN_CALLBACK type
*
* may_be_null
* TRUE: if dissection may be attempted at an offset beyond the length of existing data bits
* FALSE: othewise
*
* sz
* - is the name of the parameter within the descr where their unpacked or packed value shall be stored or fetched.
* This paramater is pointed out by the offset parameter in the same CSN_DESCR variable as the sz.
* - the free text used by the CSN_TRAP_ERROR (the same as parameter "i")
*
* serialize
* - stores the size of _MEMBER type in case of the M_TYPE_ARRAY and M_VAR_TARRAY,
* - the address of the function which is provided by the M_SERIALIZE type.
******************************************************************************************/
typedef struct
{
gint16 type;
gint16 i;
union
{
const void* ptr;
guint32 value;
} descr;
unsigned offset;
gboolean may_be_null;
const char* sz;
guint32 value;
void_fn_t aux_fn;
} CSN_DESCR;
typedef struct
{
guint8 bits;
guint8 value;
gboolean keep_bits;
CSN_DESCR descr;
} CSN_ChoiceElement_t;
void csnStreamInit(csnStream_t* ar,gint BitOffset,gint BitCount);
/******************************************************************************
* FUNCTION: csnStreamDecoder
* DESCRIPTION:
* UnPacks data from bit stream. According to CSN description.
* ARGS:
* ar stream will hold the parameters to the pack function
* ar->remaining_bits_len [IN] Number of bits to unpack [OUT] number of bits left to unpack.
* ar->bit_offset [IN/OUT] is the current bit where to proceed with the next bit to unpack.
* pDescr CSN description.
* tvb buffer containing the bit stream to unpack.
* data unpacked data.
* ett_csn1 tree
*
* RETURNS: int Number of bits left to be unpacked. Negative Error code if failed to unpack all bits
******************************************************************************/
gint16 csnStreamDecoder(csnStream_t* ar, const CSN_DESCR* pDescr, struct bitvec *vector, unsigned *readIndex, void* data);
gint16 csnStreamEncoder(csnStream_t* ar, const CSN_DESCR* pDescr, struct bitvec *vector, unsigned *writeIndex, void* data);
/* CSN struct macro's */
#define CSN_DESCR_BEGIN(_STRUCT)\
CSN_DESCR CSNDESCR_##_STRUCT[] = {
#define CSN_DESCR_END(_STRUCT)\
{CSN_END, 0, {0}, 0, FALSE, "", 0, NULL} };
/******************************************************************************
* CSN_ERROR(Par1, Par2, Par3)
* May be called at any time when an abort of packing or unpacking of a message
* is desired
* Par1: C structure name
* Par2: free text which will appear in the error handler
* Par3: Error code
*****************************************************************************/
#define CSN_ERROR(_STRUCT, _Text, _ERRCODE)\
{CSN_TRAP_ERROR, _ERRCODE, {_Text}, 0, FALSE, _Text, 0, NULL}
/******************************************************************************
* M_BIT(Par1, Par2)
* Defines one bit element in the CSN1 syntax.
* Par1: C structure name
* Par2: C structure element name
*****************************************************************************/
#define M_BIT(_STRUCT, _MEMBER)\
{CSN_BIT, 0, {0}, offsetof(_STRUCT, _MEMBER), FALSE, #_MEMBER, 0, NULL}
/******************************************************************************
* M_BIT_OR_NULL(Par1, Par2)
* Similar to the M_BIT except that not only bit 0 or 1 but also the
* end of the message may be encountered when looking for the next element in
* the message.
* Covers the case {null | 0 | 1}
*****************************************************************************/
#define M_BIT_OR_NULL(_STRUCT, _MEMBER)\
{CSN_BIT, 0, {0}, offsetof(_STRUCT, _MEMBER), TRUE, #_MEMBER, 0, NULL}
/******************************************************************************
* M_NEXT_EXIST(Par1, Par2, Par3)
* Indicates whether the next element or a group of elements defined in the
* structure is present or not.
* Par1: C structure name
* Par2: C structure element name
* Par3: number of lines to skip in the CSN_DESCR type specified if the
* element(s) does not exist
*****************************************************************************/
#define M_NEXT_EXIST(_STRUCT, _MEMBER, _NoOfExisting)\
{CSN_NEXT_EXIST, _NoOfExisting, {0}, offsetof(_STRUCT, _MEMBER), FALSE, #_MEMBER, 0, NULL}
/******************************************************************************
* M_NEXT_EXIST_LH(Par1, Par2, Par3)
* similar to the M_NEXT_EXIST except that instead of bit 0/1 which is fetched
* from the message in order to find out whether the next element/elements are
* present in the message, the logical operation XOR with the background
* pattern 0x2B is performed on the read bit before the decision is made.
*****************************************************************************/
#define M_NEXT_EXIST_LH(_STRUCT, _MEMBER, _NoOfExisting)\
{CSN_NEXT_EXIST_LH, _NoOfExisting, {0}, offsetof(_STRUCT, _MEMBER), FALSE, #_MEMBER, 0, NULL}
/******************************************************************************
* M_NEXT_EXIST_OR_NULL(Par1, Par2, Par3)
* Similar to the M_NEXT_EXIST except that not only bit 0 or 1 but also the end
* of the message may be encountered when looking for the next element in the
* message.
* Covers the case {null | 0 | 1 < IE >}
*****************************************************************************/
#define M_NEXT_EXIST_OR_NULL(_STRUCT, _MEMBER, _NoOfExisting)\
{CSN_NEXT_EXIST, _NoOfExisting, {0}, offsetof(_STRUCT, _MEMBER), TRUE, #_MEMBER, 0, NULL}
/******************************************************************************
* M_NEXT_EXIST_OR_NULL_LH(Par1, Par2, Par3)
* Similar to the M_NEXT_EXIST_LH except that not only bit 0 or 1 but also the
* end of the message may be encountered when looking for the next element in
* the message.
* Covers the case {null | L | H < IE >}
*****************************************************************************/
#define M_NEXT_EXIST_OR_NULL_LH(_STRUCT, _MEMBER, _NoOfExisting)\
{CSN_NEXT_EXIST_LH, _NoOfExisting, {(void*)1}, offsetof(_STRUCT, _MEMBER), TRUE, #_MEMBER, 0, NULL}
/******************************************************************************
* M_UINT(Par1, Par2, Par3)
* Defines an integer number.
* Par1: C structure name
* Par2: C structure element name
* Par3: number of bits used to code the element (between 1 and 32)
*****************************************************************************/
#define M_UINT(_STRUCT, _MEMBER, _BITS)\
{CSN_UINT, _BITS, {0}, offsetof(_STRUCT, _MEMBER), FALSE, #_MEMBER, 0, NULL}
/******************************************************************************
* M_UINT_OR_NULL(Par1, Par2, Par3)
* Similar to the M_UINT except that not only the request set of bits but also the
* end of the message may be encountered when looking for the next element in
* the message.
* Covers the case {null | 0 | 1 < IE >}
*****************************************************************************/
#define M_UINT_OR_NULL(_STRUCT, _MEMBER, _BITS)\
{CSN_UINT, _BITS, {0}, offsetof(_STRUCT, _MEMBER), TRUE, #_MEMBER, 0, NULL}
/******************************************************************************
* M_UINT(Par1, Par2, Par3)
* This macro has the same functionality as M_UINT except that in addition the
* logical "exclusive or" operation with the background value "0x2B" is
* performed before the final value of the integer number is delivered from the
* received CSN.1 message
*****************************************************************************/
#define M_UINT_LH(_STRUCT, _MEMBER, _BITS)\
{CSN_UINT_LH, _BITS, {0}, offsetof(_STRUCT, _MEMBER), FALSE, #_MEMBER, 0, NULL}
/******************************************************************************
* M_UINT_OFFSET(Par1, Par2, Par3, Par4)
* Defines an integer number.
* Par1: C structure name
* Par2: C structure element name
* Par3: number of bits used to code the element (between 1 and 32)
* Par4: value added to the returned integer (offset)
*****************************************************************************/
#define M_UINT_OFFSET(_STRUCT, _MEMBER, _BITS, _OFFSET)\
{CSN_UINT_OFFSET, _BITS, {(void*)_OFFSET}, offsetof(_STRUCT, _MEMBER), FALSE, #_MEMBER, 0, NULL}
/******************************************************************************
* M_UINT_ARRAY(Par1, Par2, Par3, Par4)
* Defines an array of integer numbers. The size of the array is fixed.
* Par1: C structure name
* Par2: C structure element name
* Par3: number of bits used to code the each integer element (between 1 and 32)
* Par4: number of elements in the array (fixed integer value)
*****************************************************************************/
#define M_UINT_ARRAY(_STRUCT, _MEMBER, _BITS, _ElementCount)\
{CSN_UINT_ARRAY, _BITS, {(void*)_ElementCount}, offsetof(_STRUCT, _MEMBER), FALSE, #_MEMBER, 0, NULL}
/******************************************************************************
* M_VAR_UINT_ARRAY(Par1, Par2, Par3, Par4)
* Defines an array of integer numbers. The size of the array is variable.
* Par1: C structure name
* Par2: C structure element name
* Par3: number of bits used to code the each integer element (between 1 and 32)
* Par4: number of elements in the array supplied by reference to the
* structure member holding the length value
*****************************************************************************/
#define M_VAR_UINT_ARRAY(_STRUCT, _MEMBER, _BITS, _ElementCountField)\
{CSN_UINT_ARRAY, _BITS, {(void*)offsetof(_STRUCT, _ElementCountField)}, offsetof(_STRUCT, _MEMBER), FALSE, #_MEMBER, 1, NULL}
/******************************************************************************
* M_VAR_ARRAY(Par1, Par2, Par3, Par4)
* Defines an array of 8 bit large integer numbers. The size of the array is variable.
* Par1: C structure name
* Par2: C structure element name
* Par3: name of the structure member holding the size of the array
* Par4: offset that is added to the Par3 to get the actual size of the array
*****************************************************************************/
#define M_VAR_ARRAY(_STRUCT, _MEMBER, _ElementCountField, _OFFSET)\
{CSN_VARIABLE_ARRAY, _OFFSET, {(void*)offsetof(_STRUCT, _ElementCountField)}, offsetof(_STRUCT, _MEMBER), FALSE, #_MEMBER, 0, NULL}
/******************************************************************************
* M_VAR_TARRAY(Par1, Par2, Par3, Par4)
* Similar to M_TYPE_ARRAY except that the size of the array is variable.
* Par1: C structure name
* Par2: C structure element name
* Par3: the type of each element of the array
* Par4: name of the structure member holding the size of the array
*****************************************************************************/
#define M_VAR_TARRAY(_STRUCT, _MEMBER, _MEMBER_TYPE, _ElementCountField)\
{CSN_VARIABLE_TARRAY, offsetof(_STRUCT, _ElementCountField), {(const void*)CSNDESCR_##_MEMBER_TYPE}, offsetof(_STRUCT, _MEMBER), FALSE, #_MEMBER, sizeof(_MEMBER_TYPE), NULL}
/******************************************************************************
* M_VAR_TARRAY_OFFSET(Par1, Par2, Par3, Par4)
* Same as M_VAR_TARRAY with offset
*****************************************************************************/
#define M_VAR_TARRAY_OFFSET(_STRUCT, _MEMBER, _MEMBER_TYPE, _ElementCountField)\
{CSN_VARIABLE_TARRAY_OFFSET, offsetof(_STRUCT, _ElementCountField), {(const void*)CSNDESCR_##_MEMBER_TYPE}, offsetof(_STRUCT, _MEMBER), FALSE, #_MEMBER, sizeof(_MEMBER_TYPE), NULL}
/******************************************************************************
* M_REC_ARRAY(Par1, Par2, Par3, Par4)
* similar to the M_VAR_ARRAY. The difference is that the size of the array is
* not known in advance and it has to be calculated during unpacking. Its value
* is stored in a variable which belongs to the same structure as the array.
* A zero element terminates the array. The CSN.1 syntax describes it
* recursively as:
* <array> ::={1 <element> <array>| 0}
*
* Par1: C structure name
* Par2: C structure element name
* Par3: name of the structure member where the calculated the size of the
* array will be stored
* Par4: length of each element in bits
*****************************************************************************/
#define M_REC_ARRAY(_STRUCT, _MEMBER, _ElementCountField, _BITS)\
{CSN_RECURSIVE_ARRAY, _BITS, {(const void*)offsetof(_STRUCT, _ElementCountField)}, offsetof(_STRUCT, _MEMBER), FALSE, #_MEMBER, 0, NULL}
/******************************************************************************
* M_VAR_TYPE_ARRAY(Par1, Par2, Par3, Par4)
* Defines an array of structures. The size of the array is variable.
* Par1: C structure name
* Par2: C structure element name
* Par3: name of the structure
* Par4: number of elements in the array (fixed integer value)
*****************************************************************************/
#define M_TYPE_ARRAY(_STRUCT, _MEMBER, _MEMBER_TYPE, _ElementCount)\
{CSN_TYPE_ARRAY, _ElementCount, {(const void*)CSNDESCR_##_MEMBER_TYPE}, offsetof(_STRUCT, _MEMBER), FALSE, #_MEMBER, sizeof(_MEMBER_TYPE), NULL}
/******************************************************************************
* M_REC_TARRAY(Par1, Par2, Par3, Par4)
* Defines an recursive array of structures. The size of the array is variable.
* <list> ::= {1 <type>} ** 0 ;
* Par1: C structure name
* Par2: C structure element name
* Par3: name of the structure
* Par4: will hold the number of element in the array after unpacking
*****************************************************************************/
#define M_REC_TARRAY(_STRUCT, _MEMBER, _MEMBER_TYPE, _ElementCountField)\
{CSN_RECURSIVE_TARRAY, offsetof(_STRUCT, _ElementCountField), {(const void*)CSNDESCR_##_MEMBER_TYPE}, offsetof(_STRUCT, _MEMBER), FALSE, #_MEMBER, sizeof(_MEMBER_TYPE), (void_fn_t)ElementsOf(((_STRUCT*)0)->_MEMBER)}
/******************************************************************************
* M_REC_TARRAY1(Par1, Par2, Par3, Par4)
* Same as M_REC_TARRAY but first element always exist:
* <list> ::= <type> {1 <type>} ** 0 ;
*****************************************************************************/
#define M_REC_TARRAY_1(_STRUCT, _MEMBER, _MEMBER_TYPE, _ElementCountField)\
{CSN_RECURSIVE_TARRAY_1, offsetof(_STRUCT, _ElementCountField), {(const void*)CSNDESCR_##_MEMBER_TYPE}, offsetof(_STRUCT, _MEMBER), FALSE, #_MEMBER, sizeof(_MEMBER_TYPE), (void_fn_t)ElementsOf(((_STRUCT*)0)->_MEMBER)}
/******************************************************************************
* M_REC_TARRAY2(Par1, Par2, Par3, Par4)
* Same as M_REC_TARRAY but with reversed separators :
* <lists> ::= <type> { 0 <type> } ** 1 ;
*****************************************************************************/
#define M_REC_TARRAY_2(_STRUCT, _MEMBER, _MEMBER_TYPE, _ElementCountField)\
{CSN_RECURSIVE_TARRAY_2, offsetof(_STRUCT, _ElementCountField), {(const void*)CSNDESCR_##_MEMBER_TYPE}, offsetof(_STRUCT, _MEMBER), FALSE, #_MEMBER, sizeof(_MEMBER_TYPE), (void_fn_t)ElementsOf(((_STRUCT*)0)->_MEMBER)}
/******************************************************************************
* M_TYPE(Par1, Par2, Par3)
* Defines a reference to a structure which is described elsewhere
* <list> ::= {1 <type>} ** 0 ;
* Par1: C structure name
* Par2: C structure element name
* Par3: type of member
*****************************************************************************/
#define M_TYPE(_STRUCT, _MEMBER, _MEMBER_TYPE)\
{CSN_TYPE, 0, {(const void*)CSNDESCR_##_MEMBER_TYPE}, offsetof(_STRUCT, _MEMBER), FALSE, #_MEMBER, 0, NULL}
/******************************************************************************
* M_TYPE_OR_NULL(Par1, Par2, Par3)
* Similar to the M_TYPE except that not only the request set of bits but also the
* end of the message may be encountered when looking for the next element in
* the message.
* Covers the case {null | 0 | 1 < IE >}
*****************************************************************************/
#define M_TYPE_OR_NULL(_STRUCT, _MEMBER, _MEMBER_TYPE)\
{CSN_TYPE, 0, {(const void*)CSNDESCR_##_MEMBER_TYPE}, offsetof(_STRUCT, _MEMBER), TRUE, #_MEMBER, 0, NULL}
/******************************************************************************
* M_UNION(Par1, Par2)
* Informs the CSN.1 library that a union follows and how many possible choices
* there are in the union. The actual value of the choice, which points out the
* chosen element of the union is stored in the uint8 variable and is usually
* called UnionType. The elements of the union have to be listed directly after
* the M_UNION statement.
* Par1: C structure name
* Par2: number of possible choice in the union
*****************************************************************************/
#define M_UNION(_STRUCT, _COUNT)\
{CSN_UNION, _COUNT, {0}, offsetof(_STRUCT, UnionType), FALSE, "UnionType", 0, NULL}
/******************************************************************************
* M_UNION_LH(Par1, Par2)
* Same as M_UNION but masked with background value 0x2B
*****************************************************************************/
#define M_UNION_LH(_STRUCT, _COUNT)\
{CSN_UNION_LH, _COUNT, {0}, offsetof(_STRUCT, UnionType), FALSE, "UnionType", 0, NULL}
/******************************************************************************
* M_CHOICE(Par1, Par2, Par3, Par4)
* Similar to the M_UNION. In the M_UNION the selected element of all possible
* choices in the union is referred as a sequential numbers, i.e., the first
* choice is addressed as choice 0 the second as choice 1, the third as choice
* 2 and so on, both in the encoded message and in the variable UnionType which
* is the part of the message. In the CSN_CHOICE case, this rule does not
* apply. There is free but predefined mapping of the element of the union and
* the value which addresses this element.
* The value of the address is called a selector. Up to 256 (UCHAR_MAX) unique
* selectors can be handled, longer choice list would cause CSN_ERROR_IN_SCRIPT.
* After unpacking, this value is then converted to the sequential number of the
* element in the union and stored in the UnionType variable (Par2).
* Par1: C structure name
* Par2: C structure field name holding sequential number of the chosen element.
* BEWARE! Never use an enumerated type here, because its length is
* compiler/machine dependent, while decoder would cast it to guint8.
* Par3: address of an array of type CSN_ChoiceElement_t where all possible
* values of the selector are provided, together with the selector
* length expressed in bits and the address of the CSN_DESCR type
* where the element is defined. For every element in the union
* there is one line in the Choice variable. These lines have to
* appear in the _CHOICE in the same order as the elements in the
* union. The element of the union selected in the message through
* the _CHOICE parameter is after unpacking translated to the
* corresponding sequential number of this element and stored in
* the variable pointed out by the _MEMBER
* Par4: number of possible choices in the union
*****************************************************************************/
#define M_CHOICE(_STRUCT, _MEMBER, _CHOICE, _ElementCount)\
{CSN_CHOICE, _ElementCount, {(const void*)_CHOICE}, offsetof(_STRUCT, _MEMBER), FALSE, #_CHOICE, 0, NULL}
/******************************************************************************
* M_FIXED(Par1, Par2, Par3)
* Defines a fixed value of type integer which should be fetched from or stored
* in the message
* Par1: C structure name
* Par2: gives the length of the fixed number in bits.
* Par3: the value of the number. If the expected value is not present in
* the message the unpacking procedure is aborted
*****************************************************************************/
#define M_FIXED(_STRUCT, _BITS, _BITVALUE)\
{CSN_FIXED, _BITS, {0}, _BITVALUE, FALSE, #_BITVALUE, 0, NULL}
/******************************************************************************
* M_SERIALIZE(Par1, Par2, Par3)
* Allows using a complete free format of data being encoded or decoded.
* When the M_SERIALIZE is encounted during encoding or decoding of a message
* the CSNstream program passes the control over to the specified function
* together with all necessary parameters about the current position within
* the message being unpacked or packed. When transferring of "serialized"
* data to or from the message is finished by the function the CSNstream gets
* back control over the data stream and continues to work with the message.
*****************************************************************************/
#define M_SERIALIZE(_STRUCT, _MEMBER, _LENGTH_LEN, _SERIALIZEFCN)\
{CSN_SERIALIZE, _LENGTH_LEN, {0}, offsetof(_STRUCT, _MEMBER), FALSE, #_MEMBER, 0, (void_fn_t)_SERIALIZEFCN}
#define M_CALLBACK(_STRUCT, _CSNCALLBACKFCN, _PARAM1, _PARAM2)\
{CSN_CALLBACK, offsetof(_STRUCT, _PARAM1), {0}, offsetof(_STRUCT, _PARAM2), FALSE, "CallBack_"#_CSNCALLBACKFCN, 0, (void_fn_t)_CSNCALLBACKFCN}
/******************************************************************************
* M_BITMAP(Par1, Par2, Par3)
* Defines a type which consists of a bitmap. The size of the bitmap in bits
* is fixed and provided by the parameter Par3
* Par1: C structure name
* Par2: C structure element name
* Par3: length of the bitmap expressed in bits
*****************************************************************************/
#define M_BITMAP(_STRUCT, _MEMBER, _BITS)\
{CSN_BITMAP, _BITS, {0}, offsetof(_STRUCT, _MEMBER), FALSE, #_MEMBER, 0, NULL}
/* variable length, right aligned bitmap i.e. _ElementCountField = 11 => 00000111 11111111 */
#define M_VAR_BITMAP(_STRUCT, _MEMBER, _ElementCountField, _OFFSET)\
{CSN_VARIABLE_BITMAP, _OFFSET, {(void*)offsetof(_STRUCT, _ElementCountField)}, offsetof(_STRUCT, _MEMBER), FALSE, #_MEMBER, 0, NULL}
/* variable length, right aligned bitmap filling the rest of message
* - when unpacking the _ElementCountField will be set in runtime
* - when packing _ElementCountField contains the size of bitmap
*/
#define M_VAR_BITMAP_1(_STRUCT, _MEMBER, _ElementCountField, _OFFSET)\
{CSN_VARIABLE_BITMAP_1, _OFFSET, {(void*)offsetof(_STRUCT, _ElementCountField)}, offsetof(_STRUCT, _MEMBER), FALSE, #_MEMBER, 0, NULL}
/* variable length, left aligned bitmap i.e. _ElementCountField = 11 => 11111111 11100000 */
#define M_LEFT_VAR_BMP(_STRUCT, _MEMBER, _ElementCountField, _OFFSET)\
{CSN_LEFT_ALIGNED_VAR_BMP, _OFFSET, {(void*)offsetof(_STRUCT, _ElementCountField)}, offsetof(_STRUCT, _MEMBER), FALSE, #_MEMBER, 0, NULL}
/* variable length, left aligned bitmap filling the rest of message
*- when unpacking the _ElementCountField will be set in runtime
* - when packing _ElementCountField contains the size of bitmap
*/
#define M_LEFT_VAR_BMP_1(_STRUCT, _MEMBER, _ElementCountField, _OFFSET)\
{CSN_LEFT_ALIGNED_VAR_BMP_1, _OFFSET, {(void*)offsetof(_STRUCT, _ElementCountField)}, offsetof(_STRUCT, _MEMBER), FALSE, #_MEMBER, 0, NULL}
/* todo: dissect padding bits looking for unexpected extensions */
#define M_PADDING_BITS(_STRUCT)\
{CSN_PADDING_BITS, 0, {0}, 0, TRUE, "Padding", 0, NULL}
#define M_NULL(_STRUCT, _MEMBER, _SKIP_BITS)\
{CSN_NULL, _SKIP_BITS, {0}, offsetof(_STRUCT, _MEMBER), FALSE, #_MEMBER, 0, NULL}
#define M_THIS_EXIST(_STRUCT)\
{CSN_EXIST, 0, {0}, offsetof(_STRUCT, Exist), FALSE, "Exist", 0, NULL}
#define M_THIS_EXIST_LH(_STRUCT)\
{CSN_EXIST_LH, 0, {0}, offsetof(_STRUCT, Exist), FALSE, "Exist", 0, NULL}
/* return value 0 if ok else discontionue the unpacking */
typedef gint16 (*CsnCallBackFcn_t)(void* pv ,...);
#define CSNDESCR(_FuncType) CSNDESCR_##_FuncType
#define pvDATA(_pv, _offset) ((void*) ((unsigned char*)_pv + _offset))
#define pui8DATA(_pv, _offset) ((guint8*) pvDATA(_pv, _offset))
#define pui16DATA(_pv, _offset) ((guint16*) pvDATA(_pv, _offset))
#define pui32DATA(_pv, _offset) ((guint32*) pvDATA(_pv, _offset))
#define pui64DATA(_pv, _offset) ((guint64*) pvDATA(_pv, _offset))
/* used to tag existence of next element in variable length lists */
#define STANDARD_TAG 1
#define REVERSED_TAG 0
gint16 ProcessError_impl(const char *file, int line, unsigned *readIndex,
const char* sz, gint16 err, const CSN_DESCR* pDescr);
#define ProcessError(readIndex, sz, err, pDescr) \
ProcessError_impl(__FILE__, __LINE__, readIndex, sz, err, pDescr)
#endif /*_PACKET_CSN1_H_*/