Split csn1.c into common, enc and dec files
The CSN1 encoder/decoder code is already lengthy and complex enough,
there's no need to keep it in the same file, specially because when
debugging, only is interested in one of the 2 functions, and they both
look really similar (long spaghetti switches).
Change-Id: I7d1b1f7e6d7f89b052b3fd73a960419bb2673020
diff --git a/src/csn1_enc.c b/src/csn1_enc.c
new file mode 100644
index 0000000..5518d06
--- /dev/null
+++ b/src/csn1_enc.c
@@ -0,0 +1,1305 @@
+/* csn1_enc.c
+ * 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 <assert.h>
+#include <string.h>
+#define __STDC_FORMAT_MACROS
+#include <inttypes.h>
+#include "csn1.h"
+#include <gprs_debug.h>
+
+#include <osmocom/core/logging.h>
+#include <osmocom/core/utils.h>
+
+extern const unsigned char ixBitsTab[];
+guint8 get_masked_bits8(struct bitvec *vector, unsigned *readIndex, gint bit_offset, const gint no_of_bits);
+
+/**
+ * ================================================================================================
+ * set initial/start values in help data structure used for packing/unpacking operation
+ * ================================================================================================
+ */
+
+gint16 csnStreamEncoder(csnStream_t* ar, const CSN_DESCR* pDescr, struct bitvec *vector, unsigned *writeIndex, void* data)
+{
+ gint remaining_bits_len = ar->remaining_bits_len;
+ gint bit_offset = ar->bit_offset;
+ guint8* pui8;
+ guint16* pui16;
+ guint32* pui32;
+ guint64* pui64;
+ unsigned ib;
+
+ guint8 Tag = STANDARD_TAG;
+
+ if (remaining_bits_len < 0)
+ {
+ return ProcessError(writeIndex, __func__, CSN_ERROR_NEED_MORE_BITS_TO_UNPACK, pDescr);
+ }
+
+ do
+ {
+ switch (pDescr->type)
+ {
+ case CSN_BIT:
+ {
+ if (remaining_bits_len > 0)
+ {
+ pui8 = pui8DATA(data, pDescr->offset);
+ bitvec_write_field(vector, writeIndex, *pui8, 1);
+ LOGPC(DCSN1, LOGL_DEBUG, "%s = %u | ", pDescr->sz , (unsigned)*pui8);
+ /* end add the bit value to protocol tree */
+ }
+ else if (pDescr->may_be_null)
+ {
+ LOGPC(DCSN1, LOGL_DEBUG, "%s = NULL | ", pDescr->sz);
+ }
+ else
+ {
+ return ProcessError(writeIndex,"csnStreamEncoder", 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)
+ {
+ pui8 = pui8DATA(data, pDescr->offset);
+ bitvec_write_field(vector, writeIndex, *pui8, no_of_bits);
+ LOGPC(DCSN1, LOGL_DEBUG, "%s = %u | ", pDescr->sz , (unsigned)*pui8);
+ }
+ else if (no_of_bits <= 16)
+ {
+ pui16 = pui16DATA(data, pDescr->offset);
+ bitvec_write_field(vector, writeIndex, *pui16, no_of_bits);
+ LOGPC(DCSN1, LOGL_DEBUG, "%s = %u | ", pDescr->sz , *pui16);
+ }
+ else if (no_of_bits <= 32)
+ {
+ pui32 = pui32DATA(data, pDescr->offset);
+ bitvec_write_field(vector, writeIndex, *pui32, no_of_bits);
+ LOGPC(DCSN1, LOGL_DEBUG, "%s = %u | ", pDescr->sz , *pui32);
+ }
+ else
+ {
+ return ProcessError(writeIndex,"csnStreamEncoder", CSN_ERROR_GENERAL, pDescr);
+ }
+
+ remaining_bits_len -= no_of_bits;
+ bit_offset += no_of_bits;
+ }
+ else if (pDescr->may_be_null)
+ {
+ LOGPC(DCSN1, LOGL_DEBUG, "%s = NULL | ", pDescr->sz);
+ }
+ else
+ {
+ return ProcessError(writeIndex,"csnStreamEncoder", CSN_ERROR_NEED_MORE_BITS_TO_UNPACK, pDescr);
+ }
+
+ 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)
+ {
+ pui8 = pui8DATA(data, pDescr->offset);
+ bitvec_write_field(vector, writeIndex, *pui8 - (guint8)pDescr->descr.value, no_of_bits);
+ LOGPC(DCSN1, LOGL_DEBUG, "%s = %u | ", pDescr->sz , (unsigned)(*pui8 - (guint8)pDescr->descr.value));
+ }
+ else if (no_of_bits <= 16)
+ {
+ pui16 = pui16DATA(data, pDescr->offset);
+ bitvec_write_field(vector, writeIndex, *pui16 - (guint16)pDescr->descr.value, no_of_bits);
+ LOGPC(DCSN1, LOGL_DEBUG, "%s = %u | ", pDescr->sz , (unsigned short)(*pui16 - (guint16)pDescr->descr.value));
+ }
+ else if (no_of_bits <= 32)
+ {
+ pui32 = pui32DATA(data, pDescr->offset);
+ bitvec_write_field(vector, writeIndex, *pui32 - (guint16)pDescr->descr.value, no_of_bits);
+ LOGPC(DCSN1, LOGL_DEBUG, "%s = %u | ", pDescr->sz , (unsigned int)(*pui32 - (guint16)pDescr->descr.value));
+ }
+ else
+ {
+ return ProcessError(writeIndex,"csnStreamEncoder", CSN_ERROR_GENERAL, pDescr);
+ }
+ }
+ else
+ {
+ return ProcessError(writeIndex,"csnStreamEncoder", 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)
+ {
+ pui8 = pui8DATA(data, pDescr->offset);
+ bitvec_write_field(vector, writeIndex, *pui8, no_of_bits);
+ // TODO : Change get_masked_bits8()
+ *writeIndex -= no_of_bits;
+ guint8 ui8 = get_masked_bits8(vector, writeIndex, bit_offset, no_of_bits);
+ *writeIndex -= no_of_bits;
+ bitvec_write_field(vector, writeIndex, ui8, no_of_bits);
+ LOGPC(DCSN1, LOGL_DEBUG, "%s = %u | ", pDescr->sz , (unsigned)*pui8);
+
+ }
+ else
+ {/* Maybe we should support more than 8 bits ? */
+ return ProcessError(writeIndex,"csnStreamEncoder", CSN_ERROR_GENERAL, pDescr);
+ }
+ }
+ else
+ {
+ return ProcessError(writeIndex,"csnStreamEncoder", 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))
+ {
+ if (no_of_bits <= 8)
+ {
+ pui8 = pui8DATA(data, pDescr->offset);
+ do
+ {
+ bitvec_write_field(vector, writeIndex, *pui8, no_of_bits);
+ LOGPC(DCSN1, LOGL_DEBUG, "%s = %u | ", pDescr->sz , (unsigned)*pui8);
+ pui8++;
+ remaining_bits_len -= no_of_bits;
+ bit_offset += no_of_bits;
+ } while (--nCount > 0);
+ }
+ else if (no_of_bits <= 16)
+ {
+ return ProcessError(writeIndex,"csnStreamEncoder NOTIMPLEMENTED", 999, pDescr);
+ }
+ else if (no_of_bits <= 32)
+ {
+ return ProcessError(writeIndex,"csnStreamEncoder NOTIMPLEMENTED", 999, pDescr);
+ }
+ else
+ {
+ return ProcessError(writeIndex,"csnStreamEncoder", CSN_ERROR_GENERAL, pDescr);
+ }
+ }
+ else
+ {
+ return ProcessError(writeIndex,"csnStreamEncoder", 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->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
+ */
+
+ LOGPC(DCSN1, LOGL_DEBUG, "%s : | ", pDescr->sz);
+ csnStreamInit(&arT, bit_offset, remaining_bits_len);
+ Status = csnStreamEncoder(&arT, (const CSN_DESCR*)pDescr->descr.ptr, vector, writeIndex, 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 > remaining_bits_len)
+ {
+ return ProcessError(writeIndex, "csnStreamDecoder", CSN_ERROR_NEED_MORE_BITS_TO_UNPACK, pDescr);
+ }
+
+ if (no_of_bits <= 32)
+ {
+ for(ib = 0; ib < 4; ib++)
+ {
+ pui8 = pui8DATA(data, pDescr->offset+ib);
+ bitvec_write_field(vector, writeIndex, *pui8, 8);
+ LOGPC(DCSN1, LOGL_DEBUG, "%s[%u] = %u | ", pDescr->sz , ib, (unsigned)*pui8);
+ }
+ }
+ else if (no_of_bits <= 64)
+ {
+ for(ib = 0; ib < 8; ib++)
+ {
+ pui8 = pui8DATA(data, pDescr->offset+ib);
+ bitvec_write_field(vector, writeIndex, *pui8, 8);
+ LOGPC(DCSN1, LOGL_DEBUG, "%s[%u] = %u | ", pDescr->sz , ib, (unsigned)*pui8);
+ }
+ }
+ else
+ {
+ return ProcessError(writeIndex,"csnStreamEncoder 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;
+ LOGPC(DCSN1, LOGL_DEBUG, " : %s | ", pDescr->sz);
+ csnStreamInit(&arT, bit_offset, remaining_bits_len);
+ Status = csnStreamEncoder(&arT, (const CSN_DESCR*)pDescr->descr.ptr, vector, writeIndex, 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;
+ pDescr++;
+ }
+ else
+ {
+ /* Has already been processed: ProcessError("csnStreamEncoder", Status, pDescr); */
+ return Status;
+ }
+
+ break;
+ }
+
+ case CSN_CHOICE:
+ {
+ gint16 count = pDescr->i;
+ const CSN_ChoiceElement_t* pChoice = (const CSN_ChoiceElement_t*) pDescr->descr.ptr;
+
+ /* Make sure that the list of choice items is not empty */
+ if (!count)
+ return ProcessError(writeIndex, "csnStreamEncoder", CSN_ERROR_IN_SCRIPT, pDescr);
+ else if (count > 255) /* We can handle up to 256 (UCHAR_MAX) selectors */
+ return ProcessError(writeIndex, "csnStreamEncoder", CSN_ERROR_IN_SCRIPT, pDescr);
+
+ /* Make sure that choice index is not out of range */
+ pui8 = pui8DATA(data, pDescr->offset);
+ if (*pui8 >= count)
+ return ProcessError(writeIndex, "csnStreamEncoder", CSN_ERROR_INVALID_UNION_INDEX, pDescr);
+
+ pChoice += *pui8;
+ guint8 no_of_bits = pChoice->bits;
+ guint8 value = pChoice->value;
+ LOGPC(DCSN1, LOGL_DEBUG, "%s = %u | ", pChoice->descr.sz , (unsigned)value);
+ bitvec_write_field(vector, writeIndex, value, no_of_bits);
+
+ 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;
+ bit_offset += no_of_bits;
+ remaining_bits_len -= no_of_bits;
+
+ csnStreamInit(&arT, bit_offset, remaining_bits_len);
+ Status = csnStreamEncoder(&arT, descr, vector, writeIndex, data);
+
+ if (Status >= 0)
+ {
+ remaining_bits_len = arT.remaining_bits_len;
+ bit_offset = arT.bit_offset;
+ }
+ else
+ {
+ return Status;
+ }
+
+ 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;
+ unsigned lengthIndex;
+
+ // store writeIndex for length value (7 bit)
+ lengthIndex = *writeIndex;
+ *writeIndex += length_len;
+ bit_offset += length_len;
+ remaining_bits_len -= length_len;
+ arT.direction = 0;
+ csnStreamInit(&arT, bit_offset, remaining_bits_len);
+ Status = serialize(&arT, vector, writeIndex, pvDATA(data, pDescr->offset));
+
+ bitvec_write_field(vector, &lengthIndex, *writeIndex - lengthIndex - length_len, length_len);
+ LOGPC(DCSN1, LOGL_DEBUG, "%s length = %u | ", pDescr->sz , (unsigned)(*writeIndex - lengthIndex));
+
+ 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(writeIndex,"csnStreamEncoder", CSN_ERROR_INVALID_UNION_INDEX, pDescr);
+ }
+
+ /* Now get the bits to extract the index */
+ Bits = ixBitsTab[count];
+ index = 0;
+
+ /* Assign UnionType */
+ pui8 = pui8DATA(data, pDescr->offset);
+ //read index from data and write to vector
+ bitvec_write_field(vector, writeIndex, *pui8, Bits);
+
+ //decode index
+ *writeIndex -= Bits;
+
+ while (Bits > 0)
+ {
+ index <<= 1;
+
+ if (CSN_UNION_LH == pDescr->type)
+ {
+ index |= get_masked_bits8(vector, writeIndex, bit_offset, 1);
+ }
+ else
+ {
+ index |= bitvec_read_field(vector, writeIndex, 1);
+ }
+
+ remaining_bits_len--;
+ bit_offset++;
+ Bits--;
+ }
+
+ *writeIndex -= Bits;
+ bitvec_write_field(vector, writeIndex, index, Bits);
+
+
+ /* 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)index);
+
+ switch (pDescr->type)
+ { /* get the right element of the union based on computed index */
+
+ case CSN_BIT:
+ {
+ pui8 = pui8DATA(data, pDescr->offset);
+ bitvec_write_field(vector, writeIndex, *pui8, 1);
+ LOGPC(DCSN1, LOGL_DEBUG, "%s = %u | ", pDescr->sz , (unsigned)*pui8);
+ remaining_bits_len--;
+ 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)
+ {
+ if (no_of_bits <= 8)
+ {
+ pui8 = pui8DATA(data, pDescr->offset);
+ bitvec_write_field(vector, writeIndex, *pui8, no_of_bits);
+ LOGPC(DCSN1, LOGL_DEBUG, "%s = %u | ", pDescr->sz , (unsigned)*pui8);
+ }
+ else if (no_of_bits <= 16)
+ {
+ pui16 = pui16DATA(data, pDescr->offset);
+ bitvec_write_field(vector, writeIndex, *pui16, no_of_bits);
+ LOGPC(DCSN1, LOGL_DEBUG, "%s = %u | ", pDescr->sz , *pui16);
+ }
+ else if (no_of_bits <= 32)
+ {
+ pui32 = pui32DATA(data, pDescr->offset);
+ bitvec_write_field(vector, writeIndex, *pui32, no_of_bits);
+ LOGPC(DCSN1, LOGL_DEBUG, "%s = %u | ", pDescr->sz , *pui32);
+ }
+ else
+ {
+ return ProcessError(writeIndex,"csnStreamEncoder", CSN_ERROR_GENERAL, pDescr);
+ }
+ }
+ else
+ {
+ return ProcessError(writeIndex,"csnStreamEncoder", 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)
+ {
+ pui8 = pui8DATA(data, pDescr->offset);
+ bitvec_write_field(vector, writeIndex, *pui8 - (guint8)pDescr->descr.value, no_of_bits);
+ LOGPC(DCSN1, LOGL_DEBUG, "%s = %u | ", pDescr->sz , (unsigned)(*pui8 - (guint8)pDescr->descr.value));
+ }
+ else if (no_of_bits <= 16)
+ {
+ pui16 = pui16DATA(data, pDescr->offset);
+ bitvec_write_field(vector, writeIndex, *pui16 - (guint16)pDescr->descr.value, no_of_bits);
+ LOGPC(DCSN1, LOGL_DEBUG, "%s = %u | ", pDescr->sz , (unsigned short)(*pui16 - (guint16)pDescr->descr.value));
+ }
+ else if (no_of_bits <= 32)
+ {
+ pui32 = pui32DATA(data, pDescr->offset);
+ bitvec_write_field(vector, writeIndex, *pui32 - (guint16)pDescr->descr.value, no_of_bits);
+ LOGPC(DCSN1, LOGL_DEBUG, "%s = %u | ", pDescr->sz , (unsigned int)(*pui32 - (guint16)pDescr->descr.value));
+ }
+ else
+ {
+ return ProcessError(writeIndex,"csnStreamEncoder", CSN_ERROR_GENERAL, pDescr);
+ }
+ }
+ else
+ {
+ return ProcessError(writeIndex,"csnStreamEncoder", 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)
+ {
+ pui8 = pui8DATA(data, pDescr->offset);
+ bitvec_write_field(vector, writeIndex, *pui8, no_of_bits);
+ // TODO : Change get_masked_bits8()
+ *writeIndex -= no_of_bits;
+ guint8 ui8 = get_masked_bits8(vector, writeIndex, bit_offset, no_of_bits);
+ *writeIndex -= no_of_bits;
+ bitvec_write_field(vector, writeIndex, ui8, no_of_bits);
+ LOGPC(DCSN1, LOGL_DEBUG, "%s = %u | ", pDescr->sz , (unsigned)*pui8);
+
+ }
+ else
+ {/* Maybe we should support more than 8 bits ? */
+ return ProcessError(writeIndex,"csnStreamEncoder", CSN_ERROR_GENERAL, pDescr);
+ }
+ }
+ else
+ {
+ return ProcessError(writeIndex,"csnStreamEncoder", 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))
+ {
+ if (no_of_bits <= 8)
+ {
+ pui8 = pui8DATA(data, pDescr->offset);
+ do
+ {
+ bitvec_write_field(vector, writeIndex, *pui8, no_of_bits);
+ LOGPC(DCSN1, LOGL_DEBUG, "%s = %u | ", pDescr->sz , (unsigned)*pui8);
+ pui8++;
+ remaining_bits_len -= no_of_bits;
+ bit_offset += no_of_bits;
+ } while (--nCount > 0);
+ }
+ else if (no_of_bits <= 16)
+ {
+ return ProcessError(writeIndex,"csnStreamEncoder NOTIMPLEMENTED", 999, pDescr);
+ }
+ else if (no_of_bits <= 32)
+ {
+ return ProcessError(writeIndex,"csnStreamEncoder NOTIMPLEMENTED", 999, pDescr);
+ }
+ else
+ {
+ return ProcessError(writeIndex,"csnStreamEncoder", CSN_ERROR_GENERAL, pDescr);
+ }
+ }
+ else
+ {
+ return ProcessError(writeIndex,"csnStreamEncoder", 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->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
+ */
+
+ LOGPC(DCSN1, LOGL_DEBUG, "%s : | ", pDescr->sz);
+ csnStreamInit(&arT, bit_offset, remaining_bits_len);
+ Status = csnStreamEncoder(&arT, (const CSN_DESCR*)pDescr->descr.ptr, vector, writeIndex, 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 > remaining_bits_len)
+ {
+ return ProcessError(writeIndex, "csnStreamDecoder", CSN_ERROR_NEED_MORE_BITS_TO_UNPACK, pDescr);
+ }
+
+ if (no_of_bits <= 32)
+ {
+ pui32 = pui32DATA(data, pDescr->offset);
+ bitvec_write_field(vector, writeIndex, *pui32, no_of_bits);
+ LOGPC(DCSN1, LOGL_DEBUG, "%s = %u | ", pDescr->sz , *pui32);
+ }
+ else if (no_of_bits <= 64)
+ {
+ pui64 = pui64DATA(data, pDescr->offset);
+ bitvec_write_field(vector, writeIndex, *pui64, no_of_bits);
+ LOGPC(DCSN1, LOGL_DEBUG, "%s = %lu | ", pDescr->sz , *pui64);
+ }
+ else
+ {
+ return ProcessError(writeIndex,"csnStreamEncoder 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;
+ LOGPC(DCSN1, LOGL_DEBUG, " : %s | ", pDescr->sz);
+ csnStreamInit(&arT, bit_offset, remaining_bits_len);
+ Status = csnStreamEncoder(&arT, (const CSN_DESCR*)pDescr->descr.ptr, vector, writeIndex, 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;
+ pDescr++;
+ }
+ else
+ {
+ /* Has already been processed: ProcessError("csnStreamEncoder", Status, pDescr); */
+ return Status;
+ }
+
+ break;
+ }
+
+ default:
+ { /* descriptions of union elements other than above are illegal */
+ return ProcessError(writeIndex,"csnStreamEncoder", CSN_ERROR_IN_SCRIPT, pDescr);
+ }
+ }
+
+ pDescr = pDescrNext;
+ break;
+ }
+
+ case CSN_EXIST:
+ case CSN_EXIST_LH:
+ {
+ guint8 fExist;
+ unsigned exist = 0;
+ pui8 = pui8DATA(data, pDescr->offset);
+ exist = *pui8;
+ bitvec_write_field(vector, writeIndex, *pui8, 1);
+ writeIndex--;
+ if (CSN_EXIST_LH == pDescr->type)
+ {
+ fExist = get_masked_bits8(vector, writeIndex, bit_offset, 1);
+ }
+ else
+ {
+ fExist = bitvec_read_field(vector, writeIndex, 1);
+ }
+ writeIndex--;
+ bitvec_write_field(vector, writeIndex, fExist, 1);
+ LOGPC(DCSN1, LOGL_DEBUG, "%s = %u | ", pDescr->sz, (unsigned)fExist);
+ remaining_bits_len--;
+ bit_offset++;
+ pDescr++;
+
+ if (!exist)
+ {
+ 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->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;
+
+ break;
+ }
+
+ bitvec_write_field(vector, writeIndex, *pui8, 1);
+ fExist = *pui8;
+ LOGPC(DCSN1, LOGL_DEBUG, "%s = %u | ", pDescr->sz , (unsigned)*pui8);
+
+ remaining_bits_len--;
+ 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;
+
+ /* set the data member to "not exist" */
+ //*pui8 = 0;
+ break;
+ }
+
+ /* the "regular" M_NEXT_EXIST_LH description element */
+ bitvec_write_field(vector, writeIndex, *pui8, 1);
+ writeIndex--;
+ fExist = get_masked_bits8(vector, writeIndex, bit_offset, 1);
+ writeIndex--;
+ bitvec_write_field(vector, writeIndex, fExist, 1);
+ pui8++;
+
+ remaining_bits_len--;
+ 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 */
+ }
+ /* 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)
+ {
+
+ if (remaining_bits_len < 0)
+ {
+ return ProcessError(writeIndex,"csnStreamEncoder", 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 */
+ bitvec_write_field(vector, writeIndex, *pui8, 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_bits_len -= nB1;
+ }
+
+ /* remaining no_of_bits is a multiple of 8 or 0 */
+ while (no_of_bits > 0)
+ {
+ bitvec_write_field(vector, writeIndex, *pui8, 8);
+ LOGPC(DCSN1, LOGL_DEBUG, "%s = %u | ", pDescr->sz , (unsigned)*pui8);
+ pui8++;
+ no_of_bits -= 8;
+ remaining_bits_len -= 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(writeIndex,"csnStreamEncoder", 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)
+ {
+ bitvec_write_field(vector, writeIndex, *pui8, 8);
+ LOGPC(DCSN1, LOGL_DEBUG, "%s = %u | ", pDescr->sz , (unsigned)*pui8);
+ pui8++;
+ no_of_bits -= 8;
+ }
+ if (nB1 > 0)
+ {
+ bitvec_write_field(vector, writeIndex, *pui8, 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) */
+ }
+ }
+
+ }
+
+ /* 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);
+ guint8 filler = 0x2b;
+ if (remaining_bits_len > 0)
+ {
+ while (remaining_bits_len > 0)
+ {
+ guint8 bits_to_handle = remaining_bits_len%8;
+ if (bits_to_handle > 0)
+ {
+ /* section 11 of 44.060
+ * The padding bits may be the 'null' string. Otherwise, the
+ * padding bits starts with bit '0', followed by 'spare padding'
+ * < padding bits > ::= { null | 0 < spare padding > ! < Ignore : 1 bit** = < no string > > } ;
+ */
+ guint8 fl = filler&(0xff>>(8-bits_to_handle + 1));
+ bitvec_write_field(vector, writeIndex, fl, bits_to_handle);
+ LOGPC(DCSN1, LOGL_DEBUG, "%u|", fl);
+ remaining_bits_len -= bits_to_handle;
+ bit_offset += bits_to_handle;
+ }
+ else if (bits_to_handle == 0)
+ {
+ bitvec_write_field(vector, writeIndex, filler, 8);
+ LOGPC(DCSN1, LOGL_DEBUG, "%u|", filler);
+ remaining_bits_len -= 8;
+ bit_offset += 8;
+ }
+ }
+ }
+ if (remaining_bits_len < 0)
+ {
+ return ProcessError(writeIndex,"csnStreamEncoder", 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)
+ {
+ if (remaining_bits_len < 0)
+ {
+ return ProcessError(writeIndex,"csnStreamEncoder", CSN_ERROR_NEED_MORE_BITS_TO_UNPACK, pDescr);
+ }
+
+ pui8 = pui8DATA(data, pDescr->offset);
+
+ while (count > 0)
+ {
+ bitvec_write_field(vector, writeIndex, *pui8, 8);
+ LOGPC(DCSN1, LOGL_DEBUG, "%s = 0x%x | ", pDescr->sz , (unsigned)*pui8);
+ pui8++;
+ bit_offset += 8;
+ remaining_bits_len -= 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);
+ ElementCount = *pui8DATA(data, (gint16)pDescr->descr.value);
+ while (ElementCount > 0)
+ { /* tag control shows existence of next list elements */
+ bitvec_write_field(vector, writeIndex, Tag, 1);
+ LOGPC(DCSN1, LOGL_DEBUG, "%s = %u | ", pDescr->sz , (unsigned)Tag);
+ bit_offset++;
+ remaining_bits_len--;
+
+ /* extract and store no_of_bits long element from bitstream */
+ bitvec_write_field(vector, writeIndex, *pui8, no_of_bits);
+ LOGPC(DCSN1, LOGL_DEBUG, "%s = %u | ", pDescr->sz , (unsigned)*pui8);
+ pui8++;
+ ElementCount--;
+
+ if (remaining_bits_len < 0)
+ {
+ return ProcessError(writeIndex,"csnStreamEncoder", CSN_ERROR_NEED_MORE_BITS_TO_UNPACK, pDescr);
+ }
+
+ bit_offset += no_of_bits;
+ remaining_bits_len -= no_of_bits;
+ }
+
+ bitvec_write_field(vector, writeIndex, !Tag, 1);
+ LOGPC(DCSN1, LOGL_DEBUG, "%s = %u | ", pDescr->sz , (unsigned)(!Tag));
+ bit_offset++;
+ remaining_bits_len--;
+
+ 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)}
+ */
+ gint16 nSizeElement = (gint16)(gint32)pDescr->value;
+ guint8 ElementCount = 0;
+ pui8 = pui8DATA(data, pDescr->offset);
+ /* Store the counted number of elements of the array */
+ ElementCount = *pui8DATA(data, (gint16)(gint32)pDescr->i);
+
+ while (ElementCount > 0)
+ { /* tag control shows existence of next list elements */
+ bitvec_write_field(vector, writeIndex, Tag, 1);
+ LOGPC(DCSN1, LOGL_DEBUG, "%s = %u | ", pDescr->sz , (unsigned)Tag);
+ bit_offset++;
+
+ remaining_bits_len--;
+ ElementCount--;
+
+ { /* unpack the following data structure */
+ csnStream_t arT = *ar;
+ gint16 Status;
+ csnStreamInit(&arT, bit_offset, remaining_bits_len);
+ Status = csnStreamEncoder(&arT, (const CSN_DESCR*)pDescr->descr.ptr, vector, writeIndex, 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(writeIndex,"csnStreamEncoder", CSN_ERROR_NEED_MORE_BITS_TO_UNPACK, pDescr);
+ }
+ }
+
+ bitvec_write_field(vector, writeIndex, !Tag, 1);
+ LOGPC(DCSN1, LOGL_DEBUG, "%s = %u | ", pDescr->sz , (unsigned)(!Tag));
+ bit_offset++;
+
+ 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)}
+ */
+ gint16 nSizeElement = (gint16)(gint32)pDescr->value;
+ guint8 ElementCount = 0;
+ guint8 ElementNum = 0;
+ csnStream_t arT = *ar;
+ gint16 Status;
+
+ pui8 = pui8DATA(data, pDescr->offset);
+ /* Store the count of the array */
+ ElementCount = *pui8DATA(data, pDescr->i);
+ ElementNum = ElementCount;
+
+ while (ElementCount > 0)
+ { /* get data element */
+ if (ElementCount != ElementNum)
+ {
+ bitvec_write_field(vector, writeIndex, Tag, 1);
+ LOGPC(DCSN1, LOGL_DEBUG, "%s = %u | ", pDescr->sz , (unsigned)Tag);
+ bit_offset++;
+ remaining_bits_len--;
+ }
+ ElementCount--;
+ LOGPC(DCSN1, LOGL_DEBUG, "%s { | ", pDescr->sz);
+ csnStreamInit(&arT, bit_offset, remaining_bits_len);
+ Status = csnStreamEncoder(&arT, (const CSN_DESCR*)pDescr->descr.ptr, vector, writeIndex, pui8);
+ LOGPC(DCSN1, LOGL_DEBUG, "%s } | ", pDescr->sz);
+ 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(writeIndex,"csnStreamEncoder", CSN_ERROR_NEED_MORE_BITS_TO_UNPACK, pDescr);
+ }
+
+ }
+ bitvec_write_field(vector, writeIndex, !Tag, 1);
+ bit_offset++;
+ remaining_bits_len--;
+ 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;
+ bitvec_write_field(vector, writeIndex, pDescr->offset, no_of_bits);
+ LOGPC(DCSN1, LOGL_DEBUG, "%s = %u | ", pDescr->sz , (unsigned)pDescr->offset);
+ 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, writeIndex, 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(writeIndex,"csnStreamEncoder", 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(writeIndex,"csnStreamEncoder", CSN_ERROR_NEED_MORE_BITS_TO_UNPACK, pDescr);
+}