osmo-pcu/csn1.cpp

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/* csn1.cpp
* Routines for CSN1 dissection in wireshark.
*
* Copyright (C) 2011 Ivan Klyuchnikov
*
* By Vincent Helfre, based on original code by Jari Sassi
* with the gracious authorization of STE
* Copyright (c) 2011 ST-Ericsson
*
* $Id: packet-csn1.c 39140 2011-09-25 22:01:50Z wmeier $
*
* 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.
*/
#include <iostream>
#include <cstdlib>
#include "csn1.h"
#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
#define LOG(INFO) cout
using namespace std;
static const unsigned char ixBitsTab[] = {0, 1, 1, 2, 2, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 5};
/* Returns no_of_bits (up to 8) masked with 0x2B */
static guint8
get_masked_bits8( BitVector *vector, size_t& readIndex, gint bit_offset, const gint no_of_bits)
{
static const guint8 maskBits[] = {0x00, 0x01, 0x03, 0x07, 0x0F, 0x1F, 0x3F, 0x7F, 0xFF};
//gint byte_offset = bit_offset >> 3; /* divide by 8 */
gint relative_bit_offset = bit_offset & 0x07; /* modulo 8 */
guint8 result;
gint bit_shift = 8 - relative_bit_offset - (gint) no_of_bits;
readIndex -= relative_bit_offset;
if (bit_shift >= 0)
{
result = (0x2B ^ ((guint8)vector->readField(readIndex, 8))) >> bit_shift;
readIndex-= bit_shift;
result &= maskBits[no_of_bits];
}
else
{
guint8 hight_part = (0x2B ^ ((guint8)vector->readField(readIndex, 8))) & maskBits[8 - relative_bit_offset];
hight_part = (guint8) (hight_part << (-bit_shift));
result = (0x2B ^ ((guint8)vector->readField(readIndex, 8))) >> (8 + bit_shift);
readIndex = readIndex - (8 - (-bit_shift));
result |= hight_part;
}
return result;
}
/**
* ================================================================================================
* set initial/start values in help data structure used for packing/unpacking operation
* ================================================================================================
*/
void
csnStreamInit(csnStream_t* ar, gint bit_offset, gint remaining_bits_len)
{
ar->remaining_bits_len = remaining_bits_len;
ar->bit_offset = bit_offset;
}
static const char* ErrCodes[] =
{
"General 0",
"General -1",
"DATA_NOT VALID",
"IN SCRIPT",
"INVALID UNION INDEX",
"NEED_MORE BITS TO UNPACK",
"ILLEGAL BIT VALUE",
"Internal",
"STREAM_NOT_SUPPORTED",
"MESSAGE_TOO_LONG"
};
static gint16
ProcessError( size_t readIndex, const char* sz, gint16 err, const CSN_DESCR* pDescr)
{
gint16 i = MIN(-err, ((gint16) ElementsOf(ErrCodes)-1));
if (i >= 0)
{
LOG(ERR) << sz << "Error code: "<< ErrCodes[i] << pDescr?(pDescr->sz):"-";
}
else
{
LOG(ERR) << sz << ": " << pDescr?(pDescr->sz):"-";
}
return err;
}
//#if 0
static const char* CSN_DESCR_type[]=
{
"CSN_END",
"CSN_BIT",
"CSN_UINT",
"CSN_TYPE",
"CSN_CHOICE",
"CSN_UNION",
"CSN_UNION_LH",
"CSN_UINT_ARRAY",
"CSN_TYPE_ARRAY",
"CSN_BITMAP",
"CSN_VARIABLE_BITMAP",
"CSN_VARIABLE_BITMAP_1",
"CSN_LEFT_ALIGNED_VAR_BMP",
"CSN_LEFT_ALIGNED_VAR_BMP_1",
"CSN_VARIABLE_ARRAY",
"CSN_VARIABLE_TARRAY",
"CSN_VARIABLE_TARRAY_OFFSET",
"CSN_RECURSIVE_ARRAY",
"CSN_RECURSIVE_TARRAY",
"CSN_RECURSIVE_TARRAY_1",
"CSN_RECURSIVE_TARRAY_2",
"CSN_EXIST",
"CSN_EXIST_LH",
"CSN_NEXT_EXIST",
"CSN_NEXT_EXIST_LH",
"CSN_NULL",
"CSN_FIXED",
"CSN_CALLBACK",
"CSN_UINT_OFFSET",
"CSN_UINT_LH",
"CSN_SERIALIZE",
"CSN_TRAP_ERROR"
"CSN_???"
};
//#endif
/**
* ================================================================================================
* Return TRUE if tag in bit stream indicates existence of next list element,
* otherwise return FALSE.
* Will work for tag values equal to both 0 and 1.
* ================================================================================================
*/
static gboolean
existNextElement(BitVector *vector, size_t& readIndex, guint8 Tag)
{
guint8 res = vector->readField(readIndex, 1);
//LOG(INFO) << "EXIST TAG = " << (unsigned)res;
if (Tag == STANDARD_TAG)
{
return (res > 0);
}
return (res == 0);
}
gint16
csnStreamDecoder(csnStream_t* ar, const CSN_DESCR* pDescr, BitVector *vector, size_t& readIndex, void* data)
{
gint remaining_bits_len = ar->remaining_bits_len;
gint bit_offset = ar->bit_offset;
guint8* pui8;
guint16* pui16;
guint32* pui32;
guint64* pui64;
guint8 Tag = STANDARD_TAG;
if (remaining_bits_len <= 0)
{
return 0;
}
do
{
switch (pDescr->type)
{
case CSN_BIT:
{
if (remaining_bits_len > 0)
{
pui8 = pui8DATA(data, pDescr->offset);
*pui8 = vector->readField(readIndex, 1);
LOG(INFO) << pDescr->sz << " = " <<(unsigned)*pui8 << "\n";
/* end add the bit value to protocol tree */
}
else
{
return ProcessError(readIndex,"csnStreamDecoder", CSN_ERROR_NEED_MORE_BITS_TO_UNPACK, pDescr);
}
pDescr++;
remaining_bits_len--;
bit_offset++;
break;
}
case CSN_NULL:
{ /* Empty member! */
pDescr++;
break;
}
case CSN_UINT:
{
guint8 no_of_bits = (guint8) pDescr->i;
if (remaining_bits_len >= no_of_bits)
{
if (no_of_bits <= 8)
{
guint8 ui8 = vector->readField(readIndex, no_of_bits);
pui8 = pui8DATA(data, pDescr->offset);
*pui8 = ui8;
LOG(INFO) << pDescr->sz << " = " << (unsigned)*pui8 << "\n";
}
else if (no_of_bits <= 16)
{
guint16 ui16 = vector->readField(readIndex, no_of_bits);
pui16 = pui16DATA(data, pDescr->offset);
*pui16 = ui16;
LOG(INFO) << pDescr->sz << " = " << *pui16 << "\n";;
}
else if (no_of_bits <= 32)
{
guint32 ui32 = vector->readField(readIndex, no_of_bits);
pui32 = pui32DATA(data, pDescr->offset);
*pui32 = ui32;
LOG(INFO) << pDescr->sz << " = " << *pui32 << "\n";
}
else
{
return ProcessError(readIndex,"csnStreamDecoder", CSN_ERROR_GENERAL, pDescr);
}
}
else
{
return ProcessError(readIndex,"csnStreamDecoder", CSN_ERROR_NEED_MORE_BITS_TO_UNPACK, pDescr);
}
remaining_bits_len -= no_of_bits;
bit_offset += no_of_bits;
pDescr++;
break;
}
case CSN_UINT_OFFSET:
{
guint8 no_of_bits = (guint8) pDescr->i;
if (remaining_bits_len >= no_of_bits)
{
if (no_of_bits <= 8)
{
guint8 ui8 = vector->readField(readIndex, no_of_bits);
pui8 = pui8DATA(data, pDescr->offset);
*pui8 = ui8 + (guint8)pDescr->descr.value;
LOG(INFO) << pDescr->sz << " = " << (unsigned)*pui8 << "\n";
}
else if (no_of_bits <= 16)
{
guint16 ui16 = vector->readField(readIndex, no_of_bits);
pui16 = pui16DATA(data, pDescr->offset);
*pui16 = ui16 + (guint16)pDescr->descr.value;
LOG(INFO) << pDescr->sz << " = " << *pui16 << "\n";;
}
else if (no_of_bits <= 32)
{
guint32 ui32 = vector->readField(readIndex, no_of_bits);
pui32 = pui32DATA(data, pDescr->offset);
*pui32 = ui32 + (guint16)pDescr->descr.value;
LOG(INFO) << pDescr->sz << " = " << *pui32 << "\n";
}
else
{
return ProcessError(readIndex,"csnStreamDecoder", CSN_ERROR_GENERAL, pDescr);
}
}
else
{
return ProcessError(readIndex,"csnStreamDecoder", CSN_ERROR_NEED_MORE_BITS_TO_UNPACK, pDescr);
}
remaining_bits_len -= no_of_bits;
bit_offset += no_of_bits;
pDescr++;
break;
}
case CSN_UINT_LH:
{
guint8 no_of_bits = (guint8) pDescr->i;
if (remaining_bits_len >= no_of_bits)
{
remaining_bits_len -= no_of_bits;
if (no_of_bits <= 8)
{
guint8 ui8 = get_masked_bits8(vector, readIndex, bit_offset, no_of_bits);
pui8 = pui8DATA(data, pDescr->offset);
*pui8 = ui8;
LOG(INFO) << pDescr->sz << " = " << (unsigned)*pui8 << "\n";
}
else
{/* Maybe we should support more than 8 bits ? */
return ProcessError(readIndex,"csnStreamDecoder", CSN_ERROR_GENERAL, pDescr);
}
}
else
{
return ProcessError(readIndex,"csnStreamDecoder", CSN_ERROR_NEED_MORE_BITS_TO_UNPACK, pDescr);
}
remaining_bits_len -= no_of_bits;
bit_offset += no_of_bits;
pDescr++;
break;
}
case CSN_UINT_ARRAY:
{
guint8 no_of_bits = (guint8) pDescr->i;
guint16 nCount = (guint16)pDescr->descr.value; /* nCount supplied by value i.e. M_UINT_ARRAY(...) */
if (pDescr->serialize.value != 0)
{ /* nCount specified by a reference to field holding value i.e. M_VAR_UINT_ARRAY(...) */
nCount = *pui16DATA(data, nCount);
}
if (remaining_bits_len >= no_of_bits)
{
remaining_bits_len -= (no_of_bits*nCount);
if (no_of_bits <= 8)
{
pui8 = pui8DATA(data, pDescr->offset);
do
{
*pui8 = vector->readField(readIndex, no_of_bits);
LOG(INFO) << pDescr->sz << " = " << (unsigned)*pui8 << "\n";
pui8++;
bit_offset += no_of_bits;
} while (--nCount > 0);
}
else if (no_of_bits <= 16)
{
return ProcessError(readIndex,"csnStreamDecoder NOTIMPLEMENTED", 999, pDescr);
}
else if (no_of_bits <= 32)
{
return ProcessError(readIndex,"csnStreamDecoder NOTIMPLEMENTED", 999, pDescr);
}
else
{
return ProcessError(readIndex,"csnStreamDecoder", CSN_ERROR_GENERAL, pDescr);
}
}
else
{
return ProcessError(readIndex,"csnStreamDecoder", CSN_ERROR_NEED_MORE_BITS_TO_UNPACK, pDescr);
}
pDescr++;
break;
}
case CSN_VARIABLE_TARRAY_OFFSET:
case CSN_VARIABLE_TARRAY:
case CSN_TYPE_ARRAY:
{
gint16 Status;
csnStream_t arT = *ar;
gint16 nCount = pDescr->i;
guint16 nSize = (guint16)(gint32)pDescr->serialize.value;
pui8 = pui8DATA(data, pDescr->offset);
if (pDescr->type == CSN_VARIABLE_TARRAY)
{ /* Count specified in field */
nCount = *pui8DATA(data, pDescr->i);
}
else if (pDescr->type == CSN_VARIABLE_TARRAY_OFFSET)
{ /* Count specified in field */
nCount = *pui8DATA(data, pDescr->i);
/* nCount--; the 1 offset is already taken into account in CSN_UINT_OFFSET */
}
while (nCount > 0)
{ /* resulting array of length 0 is possible
* but no bits shall be read from bitstream
*/
LOG(INFO) << pDescr->sz << "\n";
csnStreamInit(&arT, bit_offset, remaining_bits_len);
Status = csnStreamDecoder(&arT, (const CSN_DESCR*)pDescr->descr.ptr, vector, readIndex, pui8);
if (Status >= 0)
{
pui8 += nSize;
remaining_bits_len = arT.remaining_bits_len;
bit_offset = arT.bit_offset;
}
else
{
return Status;
}
nCount--;
}
pDescr++;
break;
}
case CSN_BITMAP:
{ /* bitmap with given length. The result is left aligned! */
guint8 no_of_bits = (guint8) pDescr->i; /* length of bitmap */
if (no_of_bits > 0)
{
if (no_of_bits <= 32)
{
for(unsigned ib = 0; ib < 4; ib++)
{
guint8 ui8 = vector->readField(readIndex, 8);
pui8 = pui8DATA(data, pDescr->offset+ib);
*pui8 = ui8;
LOG(INFO) << pDescr->sz <<"[" << ib << "]= " << (unsigned)*pui8 << "\n";
}
}
else if (no_of_bits <= 64)
{
for(unsigned ib = 0; ib < 8; ib++)
{
guint8 ui8 = vector->readField(readIndex, 8);
pui8 = pui8DATA(data, pDescr->offset+ib);
*pui8 = ui8;
LOG(INFO) << pDescr->sz <<"[" << ib << "]= " << (unsigned)*pui8 << "\n";
}
}
else
{
return ProcessError(readIndex,"csnStreamDecoder NOT IMPLEMENTED", 999, pDescr);
}
remaining_bits_len -= no_of_bits;
assert(remaining_bits_len >= 0);
bit_offset += no_of_bits;
}
/* bitmap was successfully extracted or it was empty */
pDescr++;
break;
}
case CSN_TYPE:
{
gint16 Status;
csnStream_t arT = *ar;
LOG(INFO) << ": " << pDescr->sz << "\n";
csnStreamInit(&arT, bit_offset, remaining_bits_len);
Status = csnStreamDecoder(&arT, (const CSN_DESCR*)pDescr->descr.ptr, vector, readIndex, pvDATA(data, pDescr->offset));
LOG(INFO) << ": End " << pDescr->sz << "\n";
if (Status >= 0)
{
remaining_bits_len = arT.remaining_bits_len;
bit_offset = arT.bit_offset;
pDescr++;
}
else
{
/* Has already been processed: ProcessError("csnStreamDecoder", Status, pDescr); */
return Status;
}
break;
}
case CSN_CHOICE:
{
gint16 count = pDescr->i;
guint8 i = 0;
CSN_ChoiceElement_t* pChoice = (CSN_ChoiceElement_t*) pDescr->descr.ptr;
while (count > 0)
{
guint8 no_of_bits = pChoice->bits;
guint8 value = vector->readField(readIndex, no_of_bits);
if (value == pChoice->value)
{
CSN_DESCR descr[2];
gint16 Status;
csnStream_t arT = *ar;
descr[0] = pChoice->descr;
memset(&descr[1], 0x00, sizeof(CSN_DESCR));
descr[1].type = CSN_END;
pui8 = pui8DATA(data, pDescr->offset);
*pui8 = i;
LOG(INFO) << "Choice " << pDescr->sz << " = " << (unsigned)value << "\n";
bit_offset += no_of_bits;
remaining_bits_len -= no_of_bits;
csnStreamInit(&arT, bit_offset, remaining_bits_len);
Status = csnStreamDecoder(&arT, descr, vector, readIndex, data);
if (Status >= 0)
{
remaining_bits_len = arT.remaining_bits_len;
bit_offset = arT.bit_offset;
}
else
{
return Status;
}
break;
}
readIndex -= no_of_bits;
count--;
pChoice++;
i++;
}
pDescr++;
break;
}
case CSN_SERIALIZE:
{
StreamSerializeFcn_t serialize = pDescr->serialize.fcn;
csnStream_t arT = *ar;
gint16 Status = -1;
LOG(INFO) << pDescr->sz << " length = " << vector->readField(readIndex, 7) << "\n";
arT.direction = 1;
bit_offset += 7;
remaining_bits_len -= 7;
csnStreamInit(&arT, bit_offset, remaining_bits_len);
Status = serialize(&arT, vector, readIndex, pvDATA(data, pDescr->offset));
if (Status >= 0)
{
remaining_bits_len = arT.remaining_bits_len;
bit_offset = arT.bit_offset;
pDescr++;
}
else
{
/* Has already been processed: */
return Status;
}
break;
}
case CSN_UNION_LH:
case CSN_UNION:
{
gint16 Bits;
guint8 index;
gint16 count = pDescr->i;
const CSN_DESCR* pDescrNext = pDescr;
pDescrNext += count + 1; /* now this is next after the union */
if ((count <= 0) || (count > 16))
{
return ProcessError(readIndex,"csnStreamDecoder", CSN_ERROR_INVALID_UNION_INDEX, pDescr);
}
/* Now get the bits to extract the index */
Bits = ixBitsTab[count];
index = 0;
while (Bits > 0)
{
index <<= 1;
if (CSN_UNION_LH == pDescr->type)
{
index |= get_masked_bits8(vector,readIndex, bit_offset, 1);
}
else
{
index |= vector->readField(readIndex, 1);
}
remaining_bits_len--;
bit_offset++;
Bits--;
}
/* Assign UnionType */
pui8 = pui8DATA(data, pDescr->offset);
*pui8 = index;
/* script index to continue on, limited in case we do not have a power of 2 */
pDescr += (MIN(index + 1, count));
LOG(INFO) << pDescr->sz << " = " << (unsigned)*pui8 << "\n";
switch (pDescr->type)
{ /* get the right element of the union based on computed index */
case CSN_BIT:
{
pui8 = pui8DATA(data, pDescr->offset);
*pui8 = 0x00;
if (vector->readField(readIndex, 1) > 0)
{
*pui8 = 0x01;
}
LOG(INFO) << pDescr->sz << " = " << (unsigned)*pui8 << "\n";
remaining_bits_len -= 1;
bit_offset++;
pDescr++;
break;
}
case CSN_NULL:
{ /* Empty member! */
pDescr++;
break;
}
case CSN_UINT:
{
guint8 no_of_bits = (guint8) pDescr->i;
if (remaining_bits_len >= no_of_bits)
{
remaining_bits_len -= no_of_bits;
if (no_of_bits <= 8)
{
guint8 ui8 = vector->readField(readIndex, no_of_bits);
pui8 = pui8DATA(data, pDescr->offset);
*pui8 = ui8;
LOG(INFO) << pDescr->sz << " = " << (unsigned)*pui8 << "\n";
}
else if (no_of_bits <= 16)
{
guint16 ui16 = vector->readField(readIndex, no_of_bits);
pui16 = pui16DATA(data, pDescr->offset);
*pui16 = ui16;
LOG(INFO) << pDescr->sz << " = " << *pui16 << "\n";
}
else if (no_of_bits <= 32)
{
guint32 ui32 = vector->readField(readIndex, no_of_bits);
pui32 = pui32DATA(data, pDescr->offset);
*pui32 = ui32;
LOG(INFO) << pDescr->sz << " = " << *pui32 << "\n";
}
else
{
return ProcessError(readIndex,"csnStreamDecoder", CSN_ERROR_GENERAL, pDescr);
}
}
else
{
return ProcessError(readIndex,"csnStreamDecoder", CSN_ERROR_GENERAL, pDescr);
}
bit_offset += no_of_bits;
pDescr++;
break;
}
case CSN_UINT_OFFSET:
{
guint8 no_of_bits = (guint8) pDescr->i;
if (remaining_bits_len >= no_of_bits)
{
if (no_of_bits <= 8)
{
guint8 ui8 = vector->readField(readIndex, no_of_bits);
pui8 = pui8DATA(data, pDescr->offset);
*pui8 = ui8 + (guint8)pDescr->descr.value;
LOG(INFO) << pDescr->sz << " = " << (unsigned)*pui8 << "\n";
}
else if (no_of_bits <= 16)
{
guint16 ui16 = vector->readField(readIndex, no_of_bits);
pui16 = pui16DATA(data, pDescr->offset);
*pui16 = ui16 + (guint16)pDescr->descr.value;
LOG(INFO) << pDescr->sz << " = " << *pui16 << "\n";
}
else if (no_of_bits <= 32)
{
guint32 ui32 = vector->readField(readIndex, no_of_bits);
pui32 = pui32DATA(data, pDescr->offset);
*pui32 = ui32 + (guint16)pDescr->descr.value;
LOG(INFO) << pDescr->sz << " = " << *pui32 << "\n";
}
else
{
return ProcessError(readIndex,"csnStreamDecoder", CSN_ERROR_GENERAL, pDescr);
}
}
else
{
return ProcessError(readIndex,"csnStreamDecoder", CSN_ERROR_NEED_MORE_BITS_TO_UNPACK, pDescr);
}
bit_offset += no_of_bits;
pDescr++;
break;
}
case CSN_UINT_LH:
{
guint8 no_of_bits = (guint8) pDescr->i;
if (remaining_bits_len >= no_of_bits)
{
if (no_of_bits <= 8)
{
guint8 ui8 = get_masked_bits8(vector, readIndex, bit_offset, no_of_bits);
pui8 = pui8DATA(data, pDescr->offset);
*pui8 = ui8;
LOG(INFO) << pDescr->sz << " = " << (unsigned)*pui8 << "\n";
}
else
{ /* Maybe we should support more than 8 bits ? */
return ProcessError(readIndex,"csnStreamDecoder", CSN_ERROR_GENERAL, pDescr);
}
}
else
{
return ProcessError(readIndex,"csnStreamDecoder", CSN_ERROR_NEED_MORE_BITS_TO_UNPACK, pDescr);
}
bit_offset += no_of_bits;
pDescr++;
break;
}
case CSN_UINT_ARRAY:
{
guint8 no_of_bits = (guint8) pDescr->i;
guint16 nCount = (guint16)pDescr->descr.value; /* nCount supplied by value i.e. M_UINT_ARRAY(...) */
if (pDescr->serialize.value != 0)
{ /* nCount specified by a reference to field holding value i.e. M_VAR_UINT_ARRAY(...) */
nCount = *pui16DATA(data, nCount);
}
if (remaining_bits_len >= no_of_bits)
{
remaining_bits_len -= (no_of_bits * nCount);
if (no_of_bits <= 8)
{
pui8 = pui8DATA(data, pDescr->offset);
while (nCount > 0)
{
*pui8 = vector->readField(readIndex, no_of_bits);
LOG(INFO) << pDescr->sz << " = " << (unsigned)*pui8 << "\n";
pui8++;
bit_offset += no_of_bits;
nCount--;
}
}
else if (no_of_bits <= 16)
{
pui16 = pui16DATA(data, pDescr->offset);
while (nCount > 0)
{
*pui16 = vector->readField(readIndex, no_of_bits);
LOG(INFO) << pDescr->sz << " = " << *pui16 << "\n";
pui16++;
bit_offset += no_of_bits;
nCount--;
}
}
else if (no_of_bits <= 32)
{ /* not supported */
return ProcessError(readIndex,"csnStreamDecoder NOT IMPLEMENTED", 999, pDescr);
}
else
{
return ProcessError(readIndex,"csnStreamDecoder", CSN_ERROR_GENERAL, pDescr);
}
}
else
{
return ProcessError(readIndex,"csnStreamDecoder", CSN_ERROR_NEED_MORE_BITS_TO_UNPACK, pDescr);
}
pDescr++;
break;
}
case CSN_VARIABLE_TARRAY_OFFSET:
case CSN_VARIABLE_TARRAY:
case CSN_TYPE_ARRAY:
{
gint16 Status;
csnStream_t arT = *ar;
guint16 nCount = (guint16) pDescr->i;
guint16 nSize = (guint16)(guint32)pDescr->serialize.value;
pui8 = pui8DATA(data, pDescr->offset);
if (CSN_VARIABLE_TARRAY == pDescr->type)
{ /* Count specified in field */
nCount = *pui8DATA(data, pDescr->i);
}
else if (CSN_VARIABLE_TARRAY_OFFSET == pDescr->type)
{ /* Count specified in field */
nCount = *pui8DATA(data, pDescr->i);
nCount--; /* Offset 1 */
}
while (nCount--) /* Changed to handle length = 0. */
{
LOG(INFO) << pDescr->sz << "\n";
csnStreamInit(&arT, bit_offset, remaining_bits_len);
Status = csnStreamDecoder(&arT, (const CSN_DESCR*)pDescr->descr.ptr, vector, readIndex, pui8);
if (Status >= 0)
{
pui8 += nSize;
remaining_bits_len = arT.remaining_bits_len;
bit_offset = arT.bit_offset;
}
else
{
return Status;
}
}
pDescr++;
break;
}
case CSN_BITMAP:
{ /* bitmap with given length. The result is left aligned! */
guint8 no_of_bits = (guint8) pDescr->i; /* length of bitmap */
if (no_of_bits > 0)
{
if (no_of_bits <= 32)
{
guint32 ui32 = vector->readField(readIndex, no_of_bits);
pui32 = pui32DATA(data, pDescr->offset);
*pui32 = ui32;
LOG(INFO) << pDescr->sz << " = " << *pui32 << "\n";
}
else if (no_of_bits <= 64)
{
guint64 ui64 = vector->readField(readIndex, no_of_bits);
pui64 = pui64DATA(data, pDescr->offset);
*pui64 = ui64;
LOG(INFO) << pDescr->sz << " = " << *pui64 << "\n";
}
else
{
return ProcessError(readIndex,"csnStreamDecoder NOT IMPLEMENTED", 999, pDescr);
}
remaining_bits_len -= no_of_bits;
assert(remaining_bits_len >= 0);
bit_offset += no_of_bits;
}
/* bitmap was successfully extracted or it was empty */
pDescr++;
break;
}
case CSN_TYPE:
{
gint16 Status;
csnStream_t arT = *ar;
LOG(INFO) << ": " << pDescr->sz << "\n";
csnStreamInit(&arT, bit_offset, remaining_bits_len);
Status = csnStreamDecoder(&arT, (const CSN_DESCR*)pDescr->descr.ptr, vector, readIndex, pvDATA(data, pDescr->offset));
LOG(INFO) << ": End " << pDescr->sz << "\n";
if (Status >= 0)
{
remaining_bits_len = arT.remaining_bits_len;
bit_offset = arT.bit_offset;
pDescr++;
}
else
{ /* return error code Has already been processed: */
return Status;
}
break;
}
default:
{ /* descriptions of union elements other than above are illegal */
return ProcessError(readIndex,"csnStreamDecoder", CSN_ERROR_IN_SCRIPT, pDescr);
}
}
pDescr = pDescrNext;
break;
}
case CSN_EXIST:
case CSN_EXIST_LH:
{
guint8 fExist;
pui8 = pui8DATA(data, pDescr->offset);
if (CSN_EXIST_LH == pDescr->type)
{
fExist = get_masked_bits8(vector, readIndex, bit_offset, 1);
}
else
{
fExist = vector->readField(readIndex, 1);
}
*pui8 = fExist;
LOG(INFO) << pDescr->sz << " = " << (unsigned)*pui8 <<"\n";
pDescr++;
remaining_bits_len -= 1;
if (!fExist)
{
ar->remaining_bits_len = remaining_bits_len;
ar->bit_offset = bit_offset;
return remaining_bits_len;
}
break;
}
case CSN_NEXT_EXIST:
{
guint8 fExist;
pui8 = pui8DATA(data, pDescr->offset);
/* this if-statement represents the M_NEXT_EXIST_OR_NULL description element */
if ((pDescr->descr.ptr != NULL) && (remaining_bits_len == 0))
{ /* no more bits to decode is fine here - end of message detected and allowed */
/* Skip i entries + this entry */
pDescr += pDescr->i + 1;
/* pDescr now must be pointing to a CSN_END entry, if not this is an error */
if ( pDescr->type != CSN_END )
{ /* Substract one more bit from remaining_bits_len to make the "not enough bits" error to be triggered */
remaining_bits_len--;
}
/* Set the data member to "not exist" */
*pui8 = 0;
break;
}
/* the "regular" M_NEXT_EXIST description element */
fExist = 0x00;
if (vector->readField(readIndex, 1))
{
fExist = 0x01;
}
*pui8 = fExist;
remaining_bits_len -= 1;
LOG(INFO) << pDescr->sz << " = " << (unsigned)*pui8 << "\n" ;
++bit_offset;
if (fExist == 0)
{ /* Skip 'i' entries */
pDescr += pDescr->i;
}
pDescr++;
break;
}
case CSN_NEXT_EXIST_LH:
{
guint8 fExist;
pui8 = pui8DATA(data, pDescr->offset);
/* this if-statement represents the M_NEXT_EXIST_OR_NULL_LH description element */
if ((pDescr->descr.ptr != NULL) && (remaining_bits_len == 0))
{ /* no more bits to decode is fine here - end of message detected and allowed */
/* skip 'i' entries + this entry */
pDescr += pDescr->i + 1;
/* pDescr now must be pointing to a CSN_END entry, if not this is an error */
if ( pDescr->type != CSN_END )
{ /* substract one more bit from remaining_bits_len to make the "not enough bits" error to be triggered */
remaining_bits_len--;
}
/* set the data member to "not exist" */
*pui8 = 0;
break;
}
/* the "regular" M_NEXT_EXIST_LH description element */
fExist = get_masked_bits8(vector,readIndex,bit_offset, 1);
LOG(INFO) << pDescr->sz << " = " << (unsigned)fExist << "\n" ;
*pui8++ = fExist;
remaining_bits_len -= 1;
bit_offset++;
if (fExist == 0)
{ /* Skip 'i' entries */
pDescr += pDescr->i;
}
pDescr++;
break;
}
case CSN_VARIABLE_BITMAP_1:
{ /* Bitmap from here and to the end of message */
*pui8DATA(data, (gint16)pDescr->descr.value) = (guint8) remaining_bits_len; /* length of bitmap == remaining bits */
/*no break -
* with a length set we have a regular variable length bitmap so we continue */
}
case CSN_VARIABLE_BITMAP:
{ /* {CSN_VARIABLE_BITMAP, 0, offsetof(_STRUCT, _ElementCountField), offsetof(_STRUCT, _MEMBER), #_MEMBER}
* <N: bit (5)> <bitmap: bit(N + offset)>
* Bit array with length (in bits) specified in parameter (pDescr->descr)
* The result is right aligned!
*/
gint16 no_of_bits = *pui8DATA(data, (gint16)pDescr->descr.value);
no_of_bits += pDescr->i; /* adjusted by offset */
if (no_of_bits > 0)
{
remaining_bits_len -= no_of_bits;
if (remaining_bits_len < 0)
{
return ProcessError(readIndex,"csnStreamDecoder", CSN_ERROR_NEED_MORE_BITS_TO_UNPACK, pDescr);
}
{ /* extract bits */
guint8* pui8 = pui8DATA(data, pDescr->offset);
gint16 nB1 = no_of_bits & 0x07;/* no_of_bits Mod 8 */
if (nB1 > 0)
{ /* take care of the first byte - it will be right aligned */
*pui8 = vector->readField(readIndex, nB1);
LOG(INFO) << pDescr->sz << " = " << (unsigned)*pui8 << "\n" ;
pui8++;
no_of_bits -= nB1;
bit_offset += nB1; /* (nB1 is no_of_bits Mod 8) */
}
/* remaining no_of_bits is a multiple of 8 or 0 */
while (no_of_bits > 0)
{
*pui8 = vector->readField(readIndex, 8);
LOG(INFO) << pDescr->sz << " = " << (unsigned)*pui8 << "\n" ;
pui8++;
no_of_bits -= 8;
}
}
}
pDescr++;
break;
}
case CSN_LEFT_ALIGNED_VAR_BMP_1:
{ /* Bitmap from here and to the end of message */
*pui8DATA(data, (gint16)pDescr->descr.value) = (guint8) remaining_bits_len; /* length of bitmap == remaining bits */
/* no break -
* with a length set we have a regular left aligned variable length bitmap so we continue
*/
}
case CSN_LEFT_ALIGNED_VAR_BMP:
{ /* {CSN_LEFT_ALIGNED_VAR_BMP, _OFFSET, (void*)offsetof(_STRUCT, _ElementCountField), offsetof(_STRUCT, _MEMBER), #_MEMBER}
* <N: bit (5)> <bitmap: bit(N + offset)>
* bit array with length (in bits) specified in parameter (pDescr->descr)
*/
gint16 no_of_bits = *pui8DATA(data, (gint16)pDescr->descr.value);/* Size of bitmap */
no_of_bits += pDescr->i;/* size adjusted by offset */
if (no_of_bits > 0)
{
remaining_bits_len -= no_of_bits;
if (remaining_bits_len < 0)
{
return ProcessError(readIndex,"csnStreamDecoder", CSN_ERROR_NEED_MORE_BITS_TO_UNPACK, pDescr);
}
{ /* extract bits */
guint8* pui8 = pui8DATA(data, pDescr->offset);
gint16 nB1 = no_of_bits & 0x07;/* no_of_bits Mod 8 */
while (no_of_bits > 0)
{
*pui8 = vector->readField(readIndex, 8);
LOG(INFO) << pDescr->sz << " = " << (unsigned)*pui8 << "\n" ;
pui8++;
no_of_bits -= 8;
}
if (nB1 > 0)
{
*pui8 = vector->readField(readIndex, nB1);
LOG(INFO) << pDescr->sz << " = " << (unsigned)*pui8 << "\n" ;
pui8++;
no_of_bits -= nB1;
bit_offset += nB1; /* (nB1 is no_of_bits Mod 8) */
}
}
}
/* bitmap was successfully extracted or it was empty */
pDescr++;
break;
}
case CSN_VARIABLE_ARRAY:
{ /* {int type; int i; void* descr; int offset; const char* sz; } CSN_DESCR;
* {CSN_VARIABLE_ARRAY, _OFFSET, (void*)offsetof(_STRUCT, _ElementCountField), offsetof(_STRUCT, _MEMBER), #_MEMBER}
* Array with length specified in parameter:
* <count: bit (x)>
* <list: octet(count + offset)>
*/
gint16 count = *pui8DATA(data, (gint16)pDescr->descr.value);
count += pDescr->i; /* Adjusted by offset */
if (count > 0)