xltenc.c

SyncML ToolKits,学习syncml的参考工具包.非常好用.

#endif

    default:
    {
      _err = SML_ERR_XLT_ENC_UNK;
    }
  }
  if (_err != SML_ERR_OK)
  {
     smlLibFree(_pBufMgr);
     smlLibFree(_pEncoder);
     return _err;
  }

  // SyncML Tag   
  if ((_err = xltGenerateTag(TN_SYNCML, TT_BEG, enc, _pBufMgr, SML_EXT_UNDEFINED)) != SML_ERR_OK)
  {
    smlLibFree(_pBufMgr);
    smlLibFree(_pEncoder);
    return _err;
  }

  // Generate SmlSyncHdr

  if ((_err = xltEncBlock(TN_SYNCHDR, REQUIRED, pHeader, enc, _pBufMgr, SML_EXT_UNDEFINED)) != SML_ERR_OK)
  {
    smlLibFree(_pBufMgr);
    smlLibFree(_pEncoder);
    return _err;
  }

  // SyncBody Tag 
  if ((_err = xltGenerateTag(TN_SYNCBODY, TT_BEG, enc, _pBufMgr, SML_EXT_UNDEFINED)) != SML_ERR_OK)
  {
    smlLibFree(_pBufMgr);
    smlLibFree(_pEncoder);
    return _err;
  }

  _pEncoder->cur_ext = _pBufMgr->smlCurExt;
  _pEncoder->last_ext = _pBufMgr->smlLastExt;
  _pEncoder->end_tag_size = _pBufMgr->endTagSize;

  *ppBufPos = _pBufMgr->smlXltBufferP;

  smlLibFree(_pBufMgr);

  _pEncoder->final = 0;

  *ppEncoder = (XltEncoderPtr_t)_pEncoder;

  return SML_ERR_OK;
}

/**
 * FUNCTION: smlXltEncAppend
 *
 * Generates (WB)XML code and appends it to the XML buffer.
 *
 * PRE-Condition:   pEncoder holds the initialized encoder structure.
 *                  the initialization takes place in the xltEncAppend function
 *                  pContent has to contain a valid content structure structure
 *                  pBufEnd must point to the end of the (WB)XML buffer
 *                  ppBufPos has to be initialized to the start point of the
 *                  (WB)XML buffer.
 *                  
 *
 * POST-Condition:  After the function call ppBufPos points to the
 *                  first free byte in the buffer behind the (WB)XML document
 *
 * IN:              pEncoder, the encoder object
 *                  pe, the protocol element (PE_ADD, ...)    
 *                  pBufEnd, pointer to the end of the buffer to write on
 *                  pContent, the content to append to the SyncML document
 * 
 * IN/OUT:          ppBufPos, current position of the bufferpointer
 * 
 * RETURN:          shows error codes of function, 
 *                  0, if OK
 *                  Possible Error Codes:
 *                  SML_ERR_XLT_MISSING_CONT            
 *                  SML_ERR_XLT_BUF_ERR                 
 *                  SML_ERR_XLT_INVAL_ELEM_TYPE         
 *                  SML_ERR_XLT_INVAL_LIST_TYPE         
 *                  SML_ERR_XLT_INVAL_TAG_TYPE          
 *                  SML_ERR_XLT_ENC_UNK	               
 *                  SML_ERR_XLT_INVAL_PROTO_ELEM
 */
Ret_t xltEncAppend(const XltEncoderPtr_t pEncoder, 
                   SmlProtoElement_t pe, 
                   const MemPtr_t pBufEnd,
                   const VoidPtr_t pContent,
                   MemPtr_t *ppBufPos)
{
  // Return variable
  Ret_t _err;

  XltTagID_t tagID = TN_UNDEF;

  // encoding type
  SmlEncoding_t _enc;

  //Structure containing buffer pointers, length and written bytes
  BufferMgmtPtr_t _pBufMgr;

  if ((_pBufMgr = (BufferMgmtPtr_t)smlLibMalloc(sizeof(BufferMgmt_t))) == NULL) return SML_ERR_NOT_ENOUGH_SPACE;
  smlLibMemset(_pBufMgr, 0, sizeof(BufferMgmt_t));

  //get the encoding type
  _enc = pEncoder->enc;
  
  _pBufMgr->vers = pEncoder->vers; // %%% luz:2003-07-31: pass SyncML version to bufmgr
  _pBufMgr->smlXltBufferP = *ppBufPos;
  _pBufMgr->smlXltBufferLen = pBufEnd - *ppBufPos;
  _pBufMgr->smlXltStoreBufP = _pBufMgr->smlXltBufferP;
  _pBufMgr->smlXltWrittenBytes = 0;      
  _pBufMgr->smlActiveExt = SML_EXT_UNDEFINED;
  _pBufMgr->switchExtTag = TN_UNDEF;
  _pBufMgr->spaceEvaluation = ((pEncoder->space_evaluation == NULL) ? 0 : 1);
  // %%% luz 2002-09-03: evaluation may not mess with encoder state
  if ( _pBufMgr->spaceEvaluation) {
    // spaceEval state
    _pBufMgr->smlCurExt = pEncoder->space_evaluation->cur_ext;
    _pBufMgr->smlLastExt = pEncoder->space_evaluation->last_ext;    
  }
  else {
    // normal encoder state
    _pBufMgr->smlCurExt = pEncoder->cur_ext;
    _pBufMgr->smlLastExt = pEncoder->last_ext;
  }

  _pBufMgr->endTagSize =0;

  _err = getTNbyPE(pe, &tagID);

  _err = xltEncBlock(tagID, REQUIRED, pContent, _enc, _pBufMgr, SML_EXT_UNDEFINED);
  if (_err != SML_ERR_OK)
  {
     smlLibFree(_pBufMgr);
     return _err;
  }  


  if (pEncoder->space_evaluation != NULL) {
    // Only calculating size
    pEncoder->space_evaluation->written_bytes += _pBufMgr->smlXltWrittenBytes;
    pEncoder->space_evaluation->end_tag_size += _pBufMgr->endTagSize;
    // save it only into evaluation state
    pEncoder->space_evaluation->cur_ext = _pBufMgr->smlCurExt;
    pEncoder->space_evaluation->last_ext = _pBufMgr->smlLastExt;    
  } else {
    // really generating data
  	pEncoder->end_tag_size += _pBufMgr->endTagSize;
  	// save it into encoder state
    pEncoder->cur_ext = _pBufMgr->smlCurExt;
    pEncoder->last_ext = _pBufMgr->smlLastExt;
  }

  *ppBufPos = _pBufMgr->smlXltBufferP;

  smlLibFree(_pBufMgr);

  return SML_ERR_OK;
}

/**
 * FUNCTION: smlXltEncTerminate
 *
 * Filnalizes the (WB)XML document and returns the size of written bytes to 
 * the workspace module
 *
 * PRE-Condition:   pEncoder holds the initialized encoder structure.
 *                  the initialization takes place in the xltEncAppend function
 *                  pBufEnd must point to the end of the (WB)XML buffer
 *                  ppBufPos has to be initialized to the start point of the
 *                  (WB)XML buffer.
 *                  
 * POST-Condition:  After the function call ppBufPos points to the
 *                  first free byte in the buffer behind the (WB)XML document
 *
 * IN:              pEncoder, the encoder object
 *                  pBufEnd, pointer to the end of the buffer to write on
 * 
 * IN/OUT:          ppBufPos, current position of the bufferpointer
 * 
 * RETURN:          shows error codes of function, 
 *                  0, if OK
 *                  Possible Error Codes:
 *                  SML_ERR_XLT_BUF_ERR      
 *                  SML_ERR_XLT_MISSING_CONT
 *                  SML_ERR_XLT_INVAL_ELEM_TYPE         
 *                  SML_ERR_XLT_INVAL_LIST_TYPE         
 *                  SML_ERR_XLT_INVAL_TAG_TYPE          
 *                  SML_ERR_XLT_ENC_UNK	               
 *                  SML_ERR_XLT_INVAL_PROTO_ELEM
 */
Ret_t xltEncTerminate(const XltEncoderPtr_t pEncoder,
                      const MemPtr_t pBufEnd,
                      MemPtr_t *ppBufPos)
{
  // Return variable      
  Ret_t _err;

  // encoding type
  SmlEncoding_t _enc;

  //Structure containing buffer pointers, length and written bytes
  BufferMgmtPtr_t _pBufMgr;

  //get the encoding type
  _enc = pEncoder->enc;

  //Initialize buffer variables
  if ((_pBufMgr = smlLibMalloc(sizeof(BufferMgmt_t))) == NULL) {
 	  smlLibFree(pEncoder);
 	  return SML_ERR_NOT_ENOUGH_SPACE;
   }

  _pBufMgr->vers = pEncoder->vers; // %%% luz:2003-07-31: pass SyncML version to bufmgr
  _pBufMgr->smlXltWrittenBytes = 0;      
  _pBufMgr->smlXltBufferP = *ppBufPos;
  _pBufMgr->smlXltStoreBufP = _pBufMgr->smlXltBufferP;
  _pBufMgr->smlXltBufferLen = pBufEnd - *ppBufPos;
  _pBufMgr->smlCurExt = pEncoder->cur_ext;
  _pBufMgr->smlLastExt = pEncoder->last_ext;
  _pBufMgr->smlActiveExt = pEncoder->cur_ext;
  _pBufMgr->switchExtTag = TN_UNDEF;
  _pBufMgr->spaceEvaluation = ((pEncoder->space_evaluation == NULL) ? 0 : 1);
  _pBufMgr->endTagSize =0;

  if (pEncoder->final == 1)
  {
    // Final Flag     
      if ((_err = xltGenerateTag(TN_FINAL, TT_ALL, _enc, _pBufMgr, SML_EXT_UNDEFINED)) != SML_ERR_OK) 
    {
      smlLibFree(_pBufMgr);
      xltEncReset(pEncoder);
      return _err;
    }
  }

  // SyncBody End Tag     
  if ((_err = xltGenerateTag(TN_SYNCBODY, TT_END, _enc, _pBufMgr, SML_EXT_UNDEFINED)) != SML_ERR_OK) 
  {
    smlLibFree(_pBufMgr);
    xltEncReset(pEncoder);
    return _err;
  }

  // SyncML End Tag       
  if ((_err = xltGenerateTag(TN_SYNCML, TT_END, _enc, _pBufMgr, SML_EXT_UNDEFINED)) != SML_ERR_OK)
  {
    smlLibFree(_pBufMgr);
    xltEncReset(pEncoder);
    return _err;
  }

  pEncoder->cur_ext = _pBufMgr->smlCurExt;
  pEncoder->last_ext = _pBufMgr->smlLastExt;

  *ppBufPos = _pBufMgr->smlXltBufferP;

  smlLibFree(_pBufMgr);

  xltEncReset(pEncoder);

  return SML_ERR_OK;
}

Ret_t xltEncReset(XltEncoderPtr_t pEncoder)
{
  if ((pEncoder) && (pEncoder->space_evaluation)) {
    smlLibFree(pEncoder->space_evaluation);
    pEncoder->space_evaluation = NULL;
  }
  smlLibFree(pEncoder);
  return SML_ERR_OK;
}


/**
 * FUNCTION: smlXltStartEvaluation
 *
 * Starts an evaluation run which prevents further API-Calls to write tags - 
 * just the tag-sizes are calculated. Must be sopped via smlEndEvaluation
 *
 * IN:              XltEncoderPtr_t
 *                  the encoder object
 *
 *