1425 lines
46 KiB
C
1425 lines
46 KiB
C
/* csn1_dec.c
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* Routines for CSN1 dissection in wireshark.
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*
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* Copyright (C) 2011 Ivan Klyuchnikov
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*
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* By Vincent Helfre, based on original code by Jari Sassi
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* with the gracious authorization of STE
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* Copyright (c) 2011 ST-Ericsson
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*
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* $Id: packet-csn1.c 39140 2011-09-25 22:01:50Z wmeier $
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <assert.h>
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#include <string.h>
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#define __STDC_FORMAT_MACROS
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#include <inttypes.h>
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#include "csn1.h"
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#include <gprs_debug.h>
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#include <osmocom/core/logging.h>
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#include <osmocom/core/utils.h>
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extern const unsigned char ixBitsTab[];
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guint8 get_masked_bits8(struct bitvec *vector, unsigned *readIndex, gint bit_offset, const gint no_of_bits);
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/**
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* ================================================================================================
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* Return TRUE if tag in bit stream indicates existence of next list element,
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* otherwise return FALSE.
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* Will work for tag values equal to both 0 and 1.
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* ================================================================================================
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*/
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static gboolean
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existNextElement(struct bitvec *vector, unsigned *readIndex, guint8 Tag)
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{
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int res = bitvec_get_bit_pos(vector, (*readIndex)++);
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if (Tag == STANDARD_TAG)
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{
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return (res > 0);
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}
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return (res == 0);
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}
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gint16
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csnStreamDecoder(csnStream_t* ar, const CSN_DESCR* pDescr, struct bitvec *vector, unsigned *readIndex, void* data)
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{
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gint remaining_bits_len = ar->remaining_bits_len;
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gint bit_offset = ar->bit_offset;
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guint8* pui8 = NULL;
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guint16* pui16;
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guint32* pui32;
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guint64* pui64;
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guint8 Tag = STANDARD_TAG;
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unsigned ib;
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if (remaining_bits_len < 0)
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{
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return ProcessError(readIndex, __func__, CSN_ERROR_NEED_MORE_BITS_TO_UNPACK, pDescr);
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}
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do
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{
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switch (pDescr->type)
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{
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case CSN_BIT:
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{
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if (remaining_bits_len > 0)
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{
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pui8 = pui8DATA(data, pDescr->offset);
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*pui8 = bitvec_read_field(vector, readIndex, 1);
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LOGPC(DCSN1, LOGL_DEBUG, "%s = %u | ", pDescr->sz , (unsigned)*pui8);
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/* end add the bit value to protocol tree */
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}
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else if (pDescr->may_be_null)
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{
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pui8 = pui8DATA(data, pDescr->offset);
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*pui8 = 0;
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LOGPC(DCSN1, LOGL_DEBUG, "%s = NULL | ", pDescr->sz);
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}
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else
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{
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return ProcessError(readIndex,"csnStreamDecoder", CSN_ERROR_NEED_MORE_BITS_TO_UNPACK, pDescr);
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}
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pDescr++;
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remaining_bits_len--;
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bit_offset++;
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break;
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}
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case CSN_NULL:
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{ /* Empty member! */
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bit_offset += pDescr->i;
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pDescr++;
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break;
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}
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case CSN_UINT:
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{
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guint8 no_of_bits = (guint8) pDescr->i;
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if (remaining_bits_len >= no_of_bits)
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{
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if (no_of_bits <= 8)
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{
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guint8 ui8 = bitvec_read_field(vector, readIndex, no_of_bits);
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pui8 = pui8DATA(data, pDescr->offset);
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*pui8 = ui8;
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LOGPC(DCSN1, LOGL_DEBUG, "%s = %u | ", pDescr->sz , (unsigned)*pui8);
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}
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else if (no_of_bits <= 16)
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{
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guint16 ui16 = bitvec_read_field(vector, readIndex, no_of_bits);
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pui16 = pui16DATA(data, pDescr->offset);
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*pui16 = ui16;
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LOGPC(DCSN1, LOGL_DEBUG, "%s = %u | ", pDescr->sz , *pui16);
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}
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else if (no_of_bits <= 32)
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{
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guint32 ui32 = bitvec_read_field(vector, readIndex, no_of_bits);
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pui32 = pui32DATA(data, pDescr->offset);
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*pui32 = ui32;
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LOGPC(DCSN1, LOGL_DEBUG, "%s = 0x%08x | ", pDescr->sz , *pui32);
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}
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else
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{
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return ProcessError(readIndex,"csnStreamDecoder", CSN_ERROR_GENERAL, pDescr);
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}
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remaining_bits_len -= no_of_bits;
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bit_offset += no_of_bits;
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}
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else if (pDescr->may_be_null)
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{
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if (no_of_bits <= 8)
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{
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pui8 = pui8DATA(data, pDescr->offset);
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*pui8 = 0;
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}
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else if (no_of_bits <= 16)
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{
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pui16 = pui16DATA(data, pDescr->offset);
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*pui16 = 0;
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}
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else if (no_of_bits <= 32)
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{
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pui32 = pui32DATA(data, pDescr->offset);
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*pui32 = 0;
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}
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LOGPC(DCSN1, LOGL_DEBUG, "%s = NULL | ", pDescr->sz);
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}
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else
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{
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return ProcessError(readIndex,"csnStreamDecoder", CSN_ERROR_NEED_MORE_BITS_TO_UNPACK, pDescr);
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}
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pDescr++;
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break;
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}
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case CSN_UINT_OFFSET:
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{
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guint8 no_of_bits = (guint8) pDescr->i;
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if (remaining_bits_len >= no_of_bits)
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{
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if (no_of_bits <= 8)
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{
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guint8 ui8 = bitvec_read_field(vector, readIndex, no_of_bits);
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pui8 = pui8DATA(data, pDescr->offset);
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*pui8 = ui8 + (guint8)pDescr->descr.value;
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LOGPC(DCSN1, LOGL_DEBUG, "%s = %u | ", pDescr->sz , (unsigned)*pui8);
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}
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else if (no_of_bits <= 16)
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{
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guint16 ui16 = bitvec_read_field(vector, readIndex, no_of_bits);
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pui16 = pui16DATA(data, pDescr->offset);
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*pui16 = ui16 + (guint16)pDescr->descr.value;
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LOGPC(DCSN1, LOGL_DEBUG, "%s = %u | ", pDescr->sz , *pui16);
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}
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else if (no_of_bits <= 32)
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{
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guint32 ui32 = bitvec_read_field(vector, readIndex, no_of_bits);
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pui32 = pui32DATA(data, pDescr->offset);
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*pui32 = ui32 + (guint16)pDescr->descr.value;
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LOGPC(DCSN1, LOGL_DEBUG, "%s = %u | ", pDescr->sz , *pui32);
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}
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else
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{
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return ProcessError(readIndex,"csnStreamDecoder", CSN_ERROR_GENERAL, pDescr);
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}
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}
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else
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{
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return ProcessError(readIndex,"csnStreamDecoder", CSN_ERROR_NEED_MORE_BITS_TO_UNPACK, pDescr);
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}
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remaining_bits_len -= no_of_bits;
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bit_offset += no_of_bits;
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pDescr++;
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break;
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}
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case CSN_UINT_LH:
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{
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guint8 no_of_bits = (guint8) pDescr->i;
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if (remaining_bits_len >= no_of_bits)
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{
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if (no_of_bits <= 8)
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{
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guint8 ui8 = get_masked_bits8(vector, readIndex, bit_offset, no_of_bits);
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pui8 = pui8DATA(data, pDescr->offset);
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*pui8 = ui8;
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LOGPC(DCSN1, LOGL_DEBUG, "%s = %u | ", pDescr->sz , (unsigned)*pui8);
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}
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else
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{/* Maybe we should support more than 8 bits ? */
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return ProcessError(readIndex,"csnStreamDecoder", CSN_ERROR_GENERAL, pDescr);
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}
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}
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else
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{
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return ProcessError(readIndex,"csnStreamDecoder", CSN_ERROR_NEED_MORE_BITS_TO_UNPACK, pDescr);
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}
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remaining_bits_len -= no_of_bits;
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bit_offset += no_of_bits;
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pDescr++;
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break;
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}
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case CSN_UINT_ARRAY:
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{
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guint8 no_of_bits = (guint8) pDescr->i;
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guint16 nCount = (guint16)pDescr->descr.value; /* nCount supplied by value i.e. M_UINT_ARRAY(...) */
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if (pDescr->value != 0)
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{ /* nCount specified by a reference to field holding value i.e. M_VAR_UINT_ARRAY(...) */
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nCount = *pui16DATA(data, nCount);
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}
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if (remaining_bits_len >= (no_of_bits * nCount))
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{
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remaining_bits_len -= (no_of_bits*nCount);
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if (no_of_bits <= 8)
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{
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pui8 = pui8DATA(data, pDescr->offset);
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do
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{
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*pui8 = bitvec_read_field(vector, readIndex, no_of_bits);
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LOGPC(DCSN1, LOGL_DEBUG, "%s = %u | ", pDescr->sz , (unsigned)*pui8);
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pui8++;
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bit_offset += no_of_bits;
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} while (--nCount > 0);
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}
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else if (no_of_bits <= 16)
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{
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return ProcessError(readIndex,"csnStreamDecoder NOTIMPLEMENTED", 999, pDescr);
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}
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else if (no_of_bits <= 32)
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{
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return ProcessError(readIndex,"csnStreamDecoder NOTIMPLEMENTED", 999, pDescr);
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}
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else
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{
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return ProcessError(readIndex,"csnStreamDecoder", CSN_ERROR_GENERAL, pDescr);
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}
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}
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else
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{
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return ProcessError(readIndex,"csnStreamDecoder", CSN_ERROR_NEED_MORE_BITS_TO_UNPACK, pDescr);
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}
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pDescr++;
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break;
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}
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case CSN_VARIABLE_TARRAY_OFFSET:
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case CSN_VARIABLE_TARRAY:
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case CSN_TYPE_ARRAY:
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{
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gint16 Status;
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csnStream_t arT = *ar;
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gint16 nCount = pDescr->i;
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guint16 nSize = (guint16)(gint32)pDescr->value;
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pui8 = pui8DATA(data, pDescr->offset);
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if (pDescr->type == CSN_VARIABLE_TARRAY)
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{ /* Count specified in field */
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nCount = *pui8DATA(data, pDescr->i);
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}
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else if (pDescr->type == CSN_VARIABLE_TARRAY_OFFSET)
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{ /* Count specified in field */
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nCount = *pui8DATA(data, pDescr->i);
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/* nCount--; the 1 offset is already taken into account in CSN_UINT_OFFSET */
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}
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while (nCount > 0)
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{ /* resulting array of length 0 is possible
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* but no bits shall be read from bitstream
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*/
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LOGPC(DCSN1, LOGL_DEBUG, "%s | ", pDescr->sz);
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csnStreamInit(&arT, bit_offset, remaining_bits_len);
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Status = csnStreamDecoder(&arT, (const CSN_DESCR*)pDescr->descr.ptr, vector, readIndex, pui8);
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if (Status >= 0)
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{
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pui8 += nSize;
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remaining_bits_len = arT.remaining_bits_len;
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bit_offset = arT.bit_offset;
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}
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else
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{
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return Status;
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}
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nCount--;
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}
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pDescr++;
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break;
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}
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case CSN_BITMAP:
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{ /* bitmap with given length. The result is left aligned! */
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guint8 no_of_bits = (guint8) pDescr->i; /* length of bitmap */
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if (no_of_bits > 0)
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{
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if (no_of_bits > remaining_bits_len)
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{
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return ProcessError(readIndex, "csnStreamDecoder", CSN_ERROR_NEED_MORE_BITS_TO_UNPACK, pDescr);
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}
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if (no_of_bits <= 32)
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{
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for(ib = 0; ib < 4; ib++)
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{
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guint8 ui8 = bitvec_read_field(vector, readIndex, 8);
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pui8 = pui8DATA(data, pDescr->offset+ib);
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*pui8 = ui8;
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LOGPC(DCSN1, LOGL_DEBUG, "%s[%u] = %u | ", pDescr->sz , ib, (unsigned)*pui8);
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}
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}
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else if (no_of_bits <= 64)
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{
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for(ib = 0; ib < 8; ib++)
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{
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guint8 ui8 = bitvec_read_field(vector, readIndex, 8);
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pui8 = pui8DATA(data, pDescr->offset+ib);
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*pui8 = ui8;
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LOGPC(DCSN1, LOGL_DEBUG, "%s[%u] = %u | ", pDescr->sz , ib, (unsigned)*pui8);
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}
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}
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else
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{
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return ProcessError(readIndex,"csnStreamDecoder NOT IMPLEMENTED", 999, pDescr);
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}
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remaining_bits_len -= no_of_bits;
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bit_offset += no_of_bits;
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}
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/* bitmap was successfully extracted or it was empty */
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pDescr++;
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break;
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}
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case CSN_TYPE:
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{
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gint16 Status;
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csnStream_t arT = *ar;
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if (pDescr->may_be_null && remaining_bits_len == 0)
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{
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LOGPC(DCSN1, LOGL_DEBUG, " : %s = NULL | ", pDescr->sz);
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} else {
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LOGPC(DCSN1, LOGL_DEBUG, " : %s | ", pDescr->sz);
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csnStreamInit(&arT, bit_offset, remaining_bits_len);
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Status = csnStreamDecoder(&arT, (const CSN_DESCR*)pDescr->descr.ptr, vector, readIndex, pvDATA(data, pDescr->offset));
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LOGPC(DCSN1, LOGL_DEBUG, ": End %s | ", pDescr->sz);
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if (Status >= 0)
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{
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remaining_bits_len = arT.remaining_bits_len;
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bit_offset = arT.bit_offset;
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}
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else
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{
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/* Has already been processed: ProcessError("csnStreamDecoder", Status, pDescr); */
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return Status;
|
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}
|
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}
|
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pDescr++;
|
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break;
|
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}
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|
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case CSN_CHOICE:
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{
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gint16 count = pDescr->i;
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guint8 i = 0;
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CSN_ChoiceElement_t* pChoice = (CSN_ChoiceElement_t*) pDescr->descr.ptr;
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|
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/* Make sure that the list of choice items is not empty */
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if (!count)
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return ProcessError(readIndex, "csnStreamDecoder", CSN_ERROR_IN_SCRIPT, pDescr);
|
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else if (count > 255) /* We can handle up to 256 (UCHAR_MAX) selectors */
|
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return ProcessError(readIndex, "csnStreamDecoder", CSN_ERROR_IN_SCRIPT, pDescr);
|
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|
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while (count > 0)
|
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{
|
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guint8 no_of_bits = pChoice->bits;
|
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guint8 value = bitvec_read_field(vector, readIndex, no_of_bits);
|
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if (value == pChoice->value)
|
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{
|
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CSN_DESCR descr[2];
|
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gint16 Status;
|
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csnStream_t arT = *ar;
|
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|
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descr[0] = pChoice->descr;
|
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memset(&descr[1], 0x00, sizeof(CSN_DESCR));
|
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descr[1].type = CSN_END;
|
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pui8 = pui8DATA(data, pDescr->offset);
|
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*pui8 = i;
|
|
LOGPC(DCSN1, LOGL_DEBUG, "Choice %s = %u | ", pDescr->sz , (unsigned)value);
|
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if (!pChoice->keep_bits) {
|
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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)
|
|
{
|
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remaining_bits_len = arT.remaining_bits_len;
|
|
bit_offset = arT.bit_offset;
|
|
}
|
|
else
|
|
{
|
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return Status;
|
|
}
|
|
break;
|
|
}
|
|
|
|
*readIndex -= no_of_bits;
|
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count--;
|
|
pChoice++;
|
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i++;
|
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}
|
|
|
|
/* Neither of the choice items matched => unknown value */
|
|
if (!count)
|
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return ProcessError(readIndex, "csnStreamDecoder", CSN_ERROR_STREAM_NOT_SUPPORTED, pDescr);
|
|
|
|
pDescr++;
|
|
break;
|
|
}
|
|
|
|
case CSN_SERIALIZE:
|
|
{
|
|
StreamSerializeFcn_t serialize = (StreamSerializeFcn_t)pDescr->aux_fn;
|
|
csnStream_t arT = *ar;
|
|
guint8 length_len = pDescr->i;
|
|
gint16 Status = -1;
|
|
|
|
guint8 length = bitvec_read_field(vector, readIndex, length_len);
|
|
|
|
LOGPC(DCSN1, LOGL_DEBUG, "%s length = %u | ", pDescr->sz , length);
|
|
bit_offset += length_len;
|
|
remaining_bits_len -= length_len;
|
|
|
|
csnStreamInit(&arT, bit_offset, length > 0 ? length : remaining_bits_len);
|
|
arT.direction = 1;
|
|
LOGPC(DCSN1, LOGL_DEBUG, "offset = %u | ", pDescr->offset);
|
|
Status = serialize(&arT, vector, readIndex, pvDATA(data, pDescr->offset));
|
|
|
|
if (Status >= 0)
|
|
{
|
|
if (length > 0) {
|
|
remaining_bits_len -= length;
|
|
bit_offset += length;
|
|
} else {
|
|
remaining_bits_len = arT.remaining_bits_len;
|
|
bit_offset = arT.bit_offset;
|
|
}
|
|
|
|
/* Skip bits not handled by serialize(), if any */
|
|
if (Status > 0) {
|
|
LOGPC(DCSN1, LOGL_DEBUG, "skipped = %d | ", Status);
|
|
*readIndex += Status;
|
|
}
|
|
|
|
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 |= bitvec_read_field(vector, 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));
|
|
LOGPC(DCSN1, LOGL_DEBUG, "%s = %u | ", pDescr->sz , (unsigned)*pui8);
|
|
|
|
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 (bitvec_read_field(vector, readIndex, 1) > 0)
|
|
{
|
|
*pui8 = 0x01;
|
|
}
|
|
LOGPC(DCSN1, LOGL_DEBUG, "%s = %u | ", pDescr->sz , (unsigned)*pui8);
|
|
remaining_bits_len -= 1;
|
|
bit_offset++;
|
|
pDescr++;
|
|
break;
|
|
}
|
|
|
|
case CSN_NULL:
|
|
{ /* Empty member! */
|
|
bit_offset += pDescr->i;
|
|
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 = bitvec_read_field(vector, readIndex, no_of_bits);
|
|
pui8 = pui8DATA(data, pDescr->offset);
|
|
*pui8 = ui8;
|
|
LOGPC(DCSN1, LOGL_DEBUG, "%s = %u | ", pDescr->sz , (unsigned)*pui8);
|
|
}
|
|
else if (no_of_bits <= 16)
|
|
{
|
|
guint16 ui16 = bitvec_read_field(vector, readIndex, no_of_bits);
|
|
pui16 = pui16DATA(data, pDescr->offset);
|
|
*pui16 = ui16;
|
|
LOGPC(DCSN1, LOGL_DEBUG, "%s = %u | ", pDescr->sz , *pui16);
|
|
}
|
|
else if (no_of_bits <= 32)
|
|
{
|
|
guint32 ui32 = bitvec_read_field(vector, readIndex, no_of_bits);
|
|
pui32 = pui32DATA(data, pDescr->offset);
|
|
*pui32 = ui32;
|
|
LOGPC(DCSN1, LOGL_DEBUG, "%s = %u | ", pDescr->sz , *pui32);
|
|
}
|
|
else
|
|
{
|
|
return ProcessError(readIndex,"csnStreamDecoder", CSN_ERROR_GENERAL, pDescr);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
return ProcessError(readIndex,"csnStreamDecoder", CSN_ERROR_GENERAL, 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 = bitvec_read_field(vector, readIndex, no_of_bits);
|
|
pui8 = pui8DATA(data, pDescr->offset);
|
|
*pui8 = ui8 + (guint8)pDescr->descr.value;
|
|
LOGPC(DCSN1, LOGL_DEBUG, "%s = %u | ", pDescr->sz , (unsigned)*pui8);
|
|
}
|
|
else if (no_of_bits <= 16)
|
|
{
|
|
guint16 ui16 = bitvec_read_field(vector, readIndex, no_of_bits);
|
|
pui16 = pui16DATA(data, pDescr->offset);
|
|
*pui16 = ui16 + (guint16)pDescr->descr.value;
|
|
LOGPC(DCSN1, LOGL_DEBUG, "%s = %u | ", pDescr->sz , *pui16);
|
|
}
|
|
else if (no_of_bits <= 32)
|
|
{
|
|
guint32 ui32 = bitvec_read_field(vector, readIndex, no_of_bits);
|
|
pui32 = pui32DATA(data, pDescr->offset);
|
|
*pui32 = ui32 + (guint16)pDescr->descr.value;
|
|
LOGPC(DCSN1, LOGL_DEBUG, "%s = %u | ", pDescr->sz , *pui32);
|
|
}
|
|
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)
|
|
{
|
|
if (no_of_bits <= 8)
|
|
{
|
|
guint8 ui8 = get_masked_bits8(vector, readIndex, bit_offset, no_of_bits);
|
|
pui8 = pui8DATA(data, pDescr->offset);
|
|
*pui8 = ui8;
|
|
LOGPC(DCSN1, LOGL_DEBUG, "%s = %u | ", pDescr->sz , (unsigned)*pui8);
|
|
}
|
|
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->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 * nCount))
|
|
{
|
|
remaining_bits_len -= (no_of_bits * nCount);
|
|
if (no_of_bits <= 8)
|
|
{
|
|
pui8 = pui8DATA(data, pDescr->offset);
|
|
|
|
while (nCount > 0)
|
|
{
|
|
*pui8 = bitvec_read_field(vector, readIndex, no_of_bits);
|
|
LOGPC(DCSN1, LOGL_DEBUG, "%s = %u | ", pDescr->sz , (unsigned)*pui8);
|
|
pui8++;
|
|
bit_offset += no_of_bits;
|
|
nCount--;
|
|
}
|
|
}
|
|
else if (no_of_bits <= 16)
|
|
{
|
|
pui16 = pui16DATA(data, pDescr->offset);
|
|
|
|
while (nCount > 0)
|
|
{
|
|
*pui16 = bitvec_read_field(vector, readIndex, no_of_bits);
|
|
LOGPC(DCSN1, LOGL_DEBUG, "%s = %u | ", pDescr->sz , *pui16);
|
|
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->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. */
|
|
{
|
|
LOGPC(DCSN1, LOGL_DEBUG, "%s | ", pDescr->sz);
|
|
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 > remaining_bits_len)
|
|
{
|
|
return ProcessError(readIndex, "csnStreamDecoder", CSN_ERROR_NEED_MORE_BITS_TO_UNPACK, pDescr);
|
|
}
|
|
|
|
if (no_of_bits <= 32)
|
|
{
|
|
guint32 ui32 = bitvec_read_field(vector, readIndex, no_of_bits);
|
|
pui32 = pui32DATA(data, pDescr->offset);
|
|
*pui32 = ui32;
|
|
}
|
|
else if (no_of_bits <= 64)
|
|
{
|
|
guint64 ui64 = bitvec_read_field(vector, readIndex, no_of_bits);
|
|
pui64 = pui64DATA(data, pDescr->offset);
|
|
*pui64 = ui64;
|
|
LOGPC(DCSN1, LOGL_DEBUG, "%s = %lu | ", pDescr->sz , *pui64);
|
|
}
|
|
else
|
|
{
|
|
return ProcessError(readIndex,"csnStreamDecoder NOT IMPLEMENTED", 999, pDescr);
|
|
}
|
|
|
|
remaining_bits_len -= no_of_bits;
|
|
bit_offset += no_of_bits;
|
|
}
|
|
/* bitmap was successfully extracted or it was empty */
|
|
|
|
pDescr++;
|
|
break;
|
|
}
|
|
|
|
case CSN_TYPE:
|
|
{
|
|
gint16 Status;
|
|
csnStream_t arT = *ar;
|
|
if (pDescr->may_be_null && remaining_bits_len == 0)
|
|
{
|
|
LOGPC(DCSN1, LOGL_DEBUG, " : %s = NULL | ", pDescr->sz);
|
|
} else {
|
|
LOGPC(DCSN1, LOGL_DEBUG, " : %s | ", pDescr->sz);
|
|
csnStreamInit(&arT, bit_offset, remaining_bits_len);
|
|
Status = csnStreamDecoder(&arT, (const CSN_DESCR*)pDescr->descr.ptr, vector, readIndex, pvDATA(data, pDescr->offset));
|
|
LOGPC(DCSN1, LOGL_DEBUG, " : End %s | ", pDescr->sz);
|
|
if (Status >= 0)
|
|
{
|
|
remaining_bits_len = arT.remaining_bits_len;
|
|
bit_offset = arT.bit_offset;
|
|
}
|
|
else
|
|
{ /* return error code Has already been processed: */
|
|
return Status;
|
|
}
|
|
}
|
|
pDescr++;
|
|
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 = bitvec_read_field(vector, readIndex, 1);
|
|
}
|
|
|
|
*pui8 = fExist;
|
|
LOGPC(DCSN1, LOGL_DEBUG, "%s = %u | ", pDescr->sz , (unsigned)*pui8);
|
|
pDescr++;
|
|
bit_offset++;
|
|
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;
|
|
guint8 isnull;
|
|
|
|
pui8 = pui8DATA(data, pDescr->offset);
|
|
|
|
/* this if-statement represents the M_NEXT_EXIST_OR_NULL description element */
|
|
if ((pDescr->may_be_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;
|
|
|
|
/* Set the data member to "not exist" */
|
|
*pui8 = 0;
|
|
break;
|
|
}
|
|
|
|
/* the "regular" M_NEXT_EXIST description element */
|
|
|
|
fExist = 0x00;
|
|
isnull = 1;
|
|
if (bitvec_read_field(vector, readIndex, 1))
|
|
{
|
|
fExist = 0x01;
|
|
if (remaining_bits_len == 1) {
|
|
/* If { 1 < end > } and all next items may be null, store it as { 0 } */
|
|
const CSN_DESCR* pDescrNext = pDescr + 1;
|
|
guint8 i;
|
|
for (i = 0; i < pDescr->i; i++, pDescrNext++)
|
|
{
|
|
if (!pDescrNext->may_be_null)
|
|
isnull = 0;
|
|
}
|
|
} else {
|
|
isnull = 0;
|
|
}
|
|
}
|
|
|
|
*pui8 = !isnull;
|
|
remaining_bits_len -= 1;
|
|
LOGPC(DCSN1, LOGL_DEBUG, "%s = %u%s | ", pDescr->sz, (unsigned)fExist, fExist && isnull ? " (NULL)" : "");
|
|
++bit_offset;
|
|
|
|
if (isnull)
|
|
{ /* Skip 'i' entries */
|
|
pDescr += pDescr->i;
|
|
}
|
|
|
|
pDescr++;
|
|
break;
|
|
}
|
|
|
|
case CSN_NEXT_EXIST_LH:
|
|
{
|
|
guint8 fExist;
|
|
guint8 isnull;
|
|
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;
|
|
|
|
/* set the data member to "not exist" */
|
|
*pui8 = 0;
|
|
break;
|
|
}
|
|
|
|
/* the "regular" M_NEXT_EXIST_LH description element */
|
|
isnull = 1;
|
|
if ((fExist = get_masked_bits8(vector, readIndex, bit_offset, 1)))
|
|
{
|
|
if (remaining_bits_len == 1) {
|
|
/* If { 1 < end > } and all next items may be null, store it as { 0 } */
|
|
const CSN_DESCR* pDescrNext = pDescr + 1;
|
|
guint8 i;
|
|
for (i = 0; i < pDescr->i; i++, pDescrNext++)
|
|
{
|
|
if (!pDescrNext->may_be_null)
|
|
isnull = 0;
|
|
}
|
|
} else {
|
|
isnull = 0;
|
|
}
|
|
}
|
|
LOGPC(DCSN1, LOGL_DEBUG, "%s = %u%s | ", pDescr->sz , (unsigned)fExist, fExist && isnull ? " (NULL)" : "");
|
|
*pui8++ = !isnull;
|
|
remaining_bits_len -= 1;
|
|
|
|
bit_offset++;
|
|
|
|
if (isnull)
|
|
{ /* 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 */
|
|
}
|
|
/* FALL THROUGH */
|
|
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 = bitvec_read_field(vector, readIndex, nB1);
|
|
LOGPC(DCSN1, LOGL_DEBUG, "%s = %u | ", pDescr->sz , (unsigned)*pui8);
|
|
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 = bitvec_read_field(vector, readIndex, 8);
|
|
LOGPC(DCSN1, LOGL_DEBUG, "%s = %u | ", pDescr->sz , (unsigned)*pui8);
|
|
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
|
|
*/
|
|
}
|
|
/* FALL THROUGH */
|
|
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);
|
|
|
|
while (no_of_bits >= 8)
|
|
{
|
|
*pui8 = bitvec_read_field(vector, readIndex, 8);
|
|
LOGPC(DCSN1, LOGL_DEBUG, "%s = %u | ", pDescr->sz , (unsigned)*pui8);
|
|
pui8++;
|
|
no_of_bits -= 8;
|
|
}
|
|
if (no_of_bits > 0)
|
|
{
|
|
*pui8 = bitvec_read_field(vector, readIndex, no_of_bits);
|
|
LOGPC(DCSN1, LOGL_DEBUG, "%s = %u | ", pDescr->sz , (unsigned)*pui8);
|
|
pui8++;
|
|
bit_offset += no_of_bits;
|
|
no_of_bits = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* bitmap was successfully extracted or it was empty */
|
|
pDescr++;
|
|
break;
|
|
}
|
|
|
|
case CSN_PADDING_BITS:
|
|
{ /* Padding from here and to the end of message */
|
|
LOGPC(DCSN1, LOGL_DEBUG, "%s = ", pDescr->sz);
|
|
if (remaining_bits_len > 0)
|
|
{
|
|
while (remaining_bits_len > 0)
|
|
{
|
|
guint bits_to_handle = remaining_bits_len%8;
|
|
if (bits_to_handle > 0)
|
|
{
|
|
LOGPC(DCSN1, LOGL_DEBUG, "%d|", bitvec_get_uint(vector, bits_to_handle));
|
|
remaining_bits_len -= bits_to_handle;
|
|
bit_offset += bits_to_handle;
|
|
}
|
|
else if (bits_to_handle == 0)
|
|
{
|
|
LOGPC(DCSN1, LOGL_DEBUG, "%d|", bitvec_get_uint(vector, 8));
|
|
remaining_bits_len -= 8;
|
|
bit_offset += 8;
|
|
}
|
|
}
|
|
}
|
|
if (remaining_bits_len < 0)
|
|
{
|
|
return ProcessError(readIndex,"csnStreamDecoder", CSN_ERROR_NEED_MORE_BITS_TO_UNPACK, pDescr);
|
|
}
|
|
|
|
/* Padding 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)
|
|
{
|
|
remaining_bits_len -= count * 8;
|
|
|
|
if (remaining_bits_len < 0)
|
|
{
|
|
return ProcessError(readIndex,"csnStreamDecoder", CSN_ERROR_NEED_MORE_BITS_TO_UNPACK, pDescr);
|
|
}
|
|
|
|
pui8 = pui8DATA(data, pDescr->offset);
|
|
|
|
while (count > 0)
|
|
{
|
|
*pui8 = bitvec_read_field(vector, readIndex, 8);
|
|
LOGPC(DCSN1, LOGL_DEBUG, "%s = 0x%x | ", pDescr->sz , (unsigned)*pui8);
|
|
pui8++;
|
|
bit_offset += 8;
|
|
count--;
|
|
}
|
|
}
|
|
|
|
pDescr++;
|
|
break;
|
|
}
|
|
|
|
case CSN_RECURSIVE_ARRAY:
|
|
{ /* Recursive way to specify an array: <list> ::= {1 <number: bit (4)> <list> | 0}
|
|
* or more generally: <list> ::= { <tag> <element> <list> | <EndTag> }
|
|
* where <element> ::= bit(value)
|
|
* <tag> ::= 0 | 1
|
|
* <EndTag> ::= reversed tag i.e. tag == 1 -> EndTag == 0 and vice versa
|
|
* {CSN_RECURSIVE_ARRAY, _BITS, (void*)offsetof(_STRUCT, _ElementCountField), offsetof(_STRUCT, _MEMBER), #_MEMBER}
|
|
* REMARK: recursive way to specify an array but an iterative implementation!
|
|
*/
|
|
gint16 no_of_bits = pDescr->i;
|
|
guint8 ElementCount = 0;
|
|
|
|
pui8 = pui8DATA(data, pDescr->offset);
|
|
|
|
while (existNextElement(vector, readIndex, Tag))
|
|
{ /* tag control shows existence of next list elements */
|
|
LOGPC(DCSN1, LOGL_DEBUG, "%s = Exist | ", pDescr->sz);
|
|
bit_offset++;
|
|
remaining_bits_len--;
|
|
|
|
/* extract and store no_of_bits long element from bitstream */
|
|
*pui8 = bitvec_read_field(vector, readIndex, no_of_bits);
|
|
LOGPC(DCSN1, LOGL_DEBUG, "%s = %u | ", pDescr->sz , (unsigned)*pui8);
|
|
pui8++;
|
|
remaining_bits_len -= no_of_bits;
|
|
ElementCount++;
|
|
|
|
if (remaining_bits_len < 0)
|
|
{
|
|
return ProcessError(readIndex,"csnStreamDecoder", CSN_ERROR_NEED_MORE_BITS_TO_UNPACK, pDescr);
|
|
}
|
|
|
|
bit_offset += no_of_bits;
|
|
}
|
|
|
|
LOGPC(DCSN1, LOGL_DEBUG, "%s = %d | ", pDescr->sz , bitvec_get_uint(vector, 1));
|
|
/* existNextElement() returned FALSE, 1 bit consumed */
|
|
bit_offset++;
|
|
remaining_bits_len--;
|
|
|
|
/* Store the counted number of elements of the array */
|
|
*pui8DATA(data, (gint16)pDescr->descr.value) = ElementCount;
|
|
|
|
pDescr++;
|
|
break;
|
|
}
|
|
|
|
case CSN_RECURSIVE_TARRAY:
|
|
{ /* Recursive way to specify an array of type: <lists> ::= { 1 <type> } ** 0 ;
|
|
* M_REC_TARRAY(_STRUCT, _MEMBER, _MEMBER_TYPE, _ElementCountField)
|
|
* {t, offsetof(_STRUCT, _ElementCountField), (void*)CSNDESCR_##_MEMBER_TYPE, offsetof(_STRUCT, _MEMBER), #_MEMBER, (StreamSerializeFcn_t)sizeof(_MEMBER_TYPE), (void_fn_t)ElementsOf(((_STRUCT*)0)->_MEMBER)}
|
|
*/
|
|
gint16 nSizeElement = (gint16)(gint32)pDescr->value;
|
|
guint32 nSizeArray = (guint32)((uintptr_t)pDescr->aux_fn);
|
|
guint8 ElementCount = 0;
|
|
pui8 = pui8DATA(data, pDescr->offset);
|
|
|
|
while (existNextElement(vector, readIndex, Tag))
|
|
{ /* tag control shows existence of next list elements */
|
|
LOGPC(DCSN1, LOGL_DEBUG, "%s = Exist | ", pDescr->sz);
|
|
/* existNextElement() returned TRUE, 1 bit consumed */
|
|
bit_offset++;
|
|
remaining_bits_len--;
|
|
ElementCount++;
|
|
|
|
if (ElementCount > nSizeArray)
|
|
{
|
|
LOGPC(DCSN1, LOGL_ERROR, "error: %s: too many elements (>%u) in recursive array. Increase its size! } |", pDescr->sz, nSizeArray);
|
|
return ProcessError(readIndex,"csnStreamDecoder", CSN_ERROR_STREAM_NOT_SUPPORTED, pDescr);
|
|
}
|
|
|
|
{ /* unpack the following data structure */
|
|
csnStream_t arT = *ar;
|
|
gint16 Status;
|
|
csnStreamInit(&arT, bit_offset, remaining_bits_len);
|
|
Status = csnStreamDecoder(&arT, (const CSN_DESCR*)pDescr->descr.ptr, vector, readIndex, pui8);
|
|
|
|
if (Status >= 0)
|
|
{ /* successful completion */
|
|
pui8 += nSizeElement; /* -> to next data element */
|
|
remaining_bits_len = arT.remaining_bits_len;
|
|
bit_offset = arT.bit_offset;
|
|
}
|
|
else
|
|
{ /* something went awry */
|
|
return Status;
|
|
}
|
|
}
|
|
|
|
if (remaining_bits_len < 0)
|
|
{
|
|
return ProcessError(readIndex,"csnStreamDecoder", CSN_ERROR_NEED_MORE_BITS_TO_UNPACK, pDescr);
|
|
}
|
|
}
|
|
|
|
LOGPC(DCSN1, LOGL_DEBUG, "%s = %d | ", pDescr->sz , bitvec_get_uint(vector, 1));
|
|
|
|
/* existNextElement() returned FALSE, 1 bit consumed */
|
|
remaining_bits_len--;
|
|
bit_offset++;
|
|
|
|
/* Store the counted number of elements of the array */
|
|
*pui8DATA(data, (gint16)(gint32)pDescr->i) = ElementCount;
|
|
|
|
pDescr++;
|
|
break;
|
|
}
|
|
|
|
case CSN_RECURSIVE_TARRAY_2:
|
|
{ /* Recursive way to specify an array of type: <list> ::= <type> { 0 <type> } ** 1 ; */
|
|
|
|
Tag = REVERSED_TAG;
|
|
|
|
/* NO break -
|
|
* handling is exactly the same as for CSN_RECURSIVE_TARRAY_1 so we continue
|
|
*/
|
|
}
|
|
/* FALL THROUGH */
|
|
case CSN_RECURSIVE_TARRAY_1:
|
|
{ /* Recursive way to specify an array of type: <lists> ::= <type> { 1 <type> } ** 0 ;
|
|
* M_REC_TARRAY(_STRUCT, _MEMBER, _MEMBER_TYPE, _ElementCountField)
|
|
* {t, offsetof(_STRUCT, _ElementCountField), (void*)CSNDESCR_##_MEMBER_TYPE, offsetof(_STRUCT, _MEMBER), #_MEMBER, (StreamSerializeFcn_t)sizeof(_MEMBER_TYPE), (void_fn_t)ElementsOf(((_STRUCT*)0)->_MEMBER)}
|
|
*/
|
|
gint16 nSizeElement = (gint16)(gint32)pDescr->value;
|
|
guint32 nSizeArray = (guint32)((uintptr_t)pDescr->aux_fn);
|
|
guint8 ElementCount = 0;
|
|
csnStream_t arT = *ar;
|
|
gboolean EndOfList = FALSE;
|
|
gint16 Status;
|
|
pui8 = pui8DATA(data, pDescr->offset);
|
|
|
|
do
|
|
{ /* get data element */
|
|
ElementCount++;
|
|
|
|
if (ElementCount > nSizeArray)
|
|
{
|
|
LOGPC(DCSN1, LOGL_ERROR, "error: %s: too many elements (>%u) in recursive array. Increase its size! } |", pDescr->sz, nSizeArray);
|
|
return ProcessError(readIndex,"csnStreamDecoder", CSN_ERROR_STREAM_NOT_SUPPORTED, pDescr);
|
|
}
|
|
|
|
LOGPC(DCSN1, LOGL_DEBUG, "%s { | ", pDescr->sz);
|
|
|
|
csnStreamInit(&arT, bit_offset, remaining_bits_len);
|
|
Status = csnStreamDecoder(&arT, (const CSN_DESCR*)pDescr->descr.ptr, vector, readIndex, pui8);
|
|
|
|
if (Status >= 0)
|
|
{ /* successful completion */
|
|
pui8 += nSizeElement; /* -> to next */
|
|
remaining_bits_len = arT.remaining_bits_len;
|
|
bit_offset = arT.bit_offset;
|
|
}
|
|
else
|
|
{ /* something went awry */
|
|
return Status;
|
|
}
|
|
|
|
if (remaining_bits_len < 0)
|
|
{
|
|
return ProcessError(readIndex,"csnStreamDecoder", CSN_ERROR_NEED_MORE_BITS_TO_UNPACK, pDescr);
|
|
}
|
|
|
|
/* control of next element's tag */
|
|
LOGPC(DCSN1, LOGL_DEBUG, "%s } | ", pDescr->sz);
|
|
EndOfList = !(existNextElement(vector, readIndex, Tag));
|
|
|
|
bit_offset++;
|
|
remaining_bits_len--; /* 1 bit consumed (tag) */
|
|
} while (!EndOfList);
|
|
|
|
|
|
/* Store the count of the array */
|
|
*pui8DATA(data, pDescr->i) = ElementCount;
|
|
Tag = STANDARD_TAG; /* in case it was set to "reversed" */
|
|
pDescr++;
|
|
break;
|
|
}
|
|
|
|
case CSN_FIXED:
|
|
{ /* Verify the fixed bits */
|
|
guint8 no_of_bits = (guint8) pDescr->i;
|
|
guint32 ui32;
|
|
|
|
if (no_of_bits <= 32)
|
|
{
|
|
ui32 = bitvec_read_field(vector, readIndex, no_of_bits);
|
|
}
|
|
else
|
|
{
|
|
return ProcessError(readIndex,"no_of_bits > 32", -1, pDescr);
|
|
}
|
|
if (ui32 != (unsigned)(gint32)pDescr->offset)
|
|
{
|
|
return ProcessError(readIndex,"csnStreamDecoder FIXED value does not match", -1, pDescr);
|
|
}
|
|
|
|
LOGPC(DCSN1, LOGL_DEBUG, "%s = %u | ", pDescr->sz , (unsigned int)ui32);
|
|
remaining_bits_len -= no_of_bits;
|
|
bit_offset += no_of_bits;
|
|
pDescr++;
|
|
break;
|
|
}
|
|
|
|
case CSN_CALLBACK:
|
|
{
|
|
guint16 no_of_bits;
|
|
DissectorCallbackFcn_t callback = (DissectorCallbackFcn_t)pDescr->aux_fn;
|
|
LOGPC(DCSN1, LOGL_DEBUG, "CSN_CALLBACK(%s) | ", pDescr->sz);
|
|
no_of_bits = callback(vector, readIndex, pvDATA(data, pDescr->i), pvDATA(data, pDescr->offset));
|
|
remaining_bits_len -= no_of_bits;
|
|
bit_offset += no_of_bits;
|
|
pDescr++;
|
|
break;
|
|
}
|
|
|
|
case CSN_TRAP_ERROR:
|
|
{
|
|
return ProcessError(readIndex,"csnStreamDecoder", pDescr->i, pDescr);
|
|
}
|
|
|
|
case CSN_END:
|
|
{
|
|
ar->remaining_bits_len = remaining_bits_len;
|
|
ar->bit_offset = bit_offset;
|
|
return remaining_bits_len;
|
|
}
|
|
|
|
default:
|
|
{
|
|
assert(0);
|
|
}
|
|
|
|
|
|
}
|
|
|
|
} while (remaining_bits_len >= 0);
|
|
|
|
return ProcessError(readIndex,"csnStreamDecoder", CSN_ERROR_NEED_MORE_BITS_TO_UNPACK, pDescr);
|
|
}
|