asmrulep.cpp

著名的 helix realplayer 基于手机 symbian 系统的 播放器全套源代码

	"								    \
	    #(16000 > $Bandwidth) && (($Bandwidth >= 8000)),		    \
	    TolerablePacketLoss=2,					    \
	    AverageBandwidth=8000,					    \
	    AverageBandwidthStd=0,					    \
	    Foo=\"This is a test\",					    \
	    Bar=\"This wu'z a test\",					    \
	    Priority=7;							    \
	"
	/* Rule 4 */
	"								    \
	    # ($Bandwidth > 8000),					    \
	    AverageBandwidth=4000,					    \
	    Priority=7;							    \
	"
	};

    ASMRuleBook	    r(pRuleBook);

    for (int i = 0; i < 25000; i += 1000)
    {
	IHXValues* pVal = new CHXHeader;
	IHXBuffer* pBuffer = new CHXBuffer;
	char s[1024]; /* Flawfinder: ignore */
	//printf ("%d\n", i);
	sprintf (s, "%d", i); /* Flawfinder: ignore */

	pBuffer->Set((unsigned char *)s, 5);
	pVal->SetPropertyCString("Bandwidth", pBuffer);
	pVal->AddRef();

	pBuffer = new CHXBuffer;
	sprintf (s, "%d", 60); /* Flawfinder: ignore */
	pBuffer->Set((unsigned char *)s, 5);
	pVal->SetPropertyCString("Cpu", pBuffer);
	pVal->AddRef();

	if (i == 0)
	{
	    printf ("Threshold Points:  ");
	    float pThreshold[1024];
	    memset (pThreshold, 0xffffffff, sizeof(float) * 1024);
	    UINT32 ulNum = 0;
	    r.GetPreEvaluate(pThreshold, ulNum, pVal, "Bandwidth");
	    for (int j = 0; j < ulNum; j++)
	    {
		printf ("%.2f ", pThreshold[j]);
	    }
	    printf ("\n");
	}

	BOOL pSubInfo[1024];
	r.GetSubscription(pSubInfo, pVal);
	printf ("    bw %5d: %d %d %d %d\n", i,
	    pSubInfo[0], pSubInfo[1], pSubInfo[2], pSubInfo[3], pSubInfo[4]);

	pVal->Release();
    }

    return 0;
}
#endif

HX_RESULT
ASMRuleBook::InitRulesArray()
{
   if( !m_pValidRulesArray )
   {
      m_pValidRulesArray = new BOOL[ m_unNumRules ];
      if(!m_pValidRulesArray)
      {
          return HXR_OUTOFMEMORY;
      }

      for( int ii=0; ii<m_unNumRules; ii++ )
      {
         m_pValidRulesArray[ii] = TRUE;
      }
   }
   if( !m_pDeletedRulesArray )
   {
      m_pDeletedRulesArray = new BOOL[ m_unNumRules ];
      if(!m_pDeletedRulesArray)
      {
          HX_VECTOR_DELETE(m_pValidRulesArray);
          return HXR_OUTOFMEMORY;
      }
      for( int ii=0; ii<m_unNumRules; ii++ )
      {
         m_pDeletedRulesArray[ii] = FALSE;
      }
   }
   return HXR_OK;
}

HX_RESULT
ASMRuleBook::Enable( UINT16 nRule )
{
   // Allocate and initialized m_pValidRulesArray if necessary.
   if( HXR_OUTOFMEMORY == InitRulesArray() )
   {
       return HXR_OUTOFMEMORY;
   }
   else
   {
       m_pValidRulesArray[nRule] = TRUE;
   }

   return HXR_OK;
}

HX_RESULT
ASMRuleBook::Disable( UINT16 nRule )
{
   // Allocate and initialized m_pValidRulesArray if necessary.
   if( HXR_OUTOFMEMORY == InitRulesArray() )
   {
       return HXR_OUTOFMEMORY;
   }
   else
   {
       m_pValidRulesArray[nRule] = FALSE;
   }

   return HXR_OK;
}

HX_RESULT
ASMRuleBook::ReCompute()
{
   // We should call a Reset function here
   if( HXR_OUTOFMEMORY == Reset() )
   {
       return HXR_OUTOFMEMORY;
   }

   for( int ii=0; ii<m_unNumRules; ii++ )
   {
      if( m_pValidRulesArray[ ii ] == FALSE )
      {
	 DeleteRule( ii );
      }
   }
   return HXR_OK;
}

// Remove a rule from the rulebook and 'collapse' the surrounding rules
// to cover the bandwidth range that up to now was covered by this rule.
HX_RESULT
ASMRuleBook::DeleteRule( int uRuleToDel )
{
   int nLeftEdge = 0;
   int nRightEdge = 0;
   ULONG32 uNumActiveRules = 0;
   int ii;

   // The rule should not be greater the max, of course.
   if( uRuleToDel > m_unNumRules )
   {
      return HXR_FAIL;
   }

   // Find the "right edge" rule.
   for( ii=0; ii<m_unNumRules; ii++ )
   {
      if( !m_pDeletedRulesArray[ii] && m_pRules[ii].m_pRuleExpression->IsRightEdge() )
      {
         nRightEdge = ii;
	 break;
      }
   }

   // Find the "left edge" rule.
   for( ii=m_unNumRules-1; ii>=0; ii-- )
   {
      if( ( m_pDeletedRulesArray[ii] == FALSE ) && ( m_pRules[ ii ].m_pRuleExpression->GetLeft() || m_pRules[ ii ].m_pRuleExpression->GetRight() ) )
      {
         nLeftEdge = ii;
      }
   }

   // Determine the number of active rules.
   for( ii=0; ii<m_unNumRules; ii++ )
   {
      if( !m_pDeletedRulesArray[ii] )
      {
         uNumActiveRules++;
      }
   }

   // We handle the 3 possible cases separately: 1) Left Edge, 2) Right Edge, 
   // and 3) Non-Edge.
   if( uRuleToDel == nLeftEdge )
   {
      // Left edge case
      // Modify the next rule(s) to the right so that it's > value is 0.
      // But only if this is the only rule covering uRuleToDel's bw range.
      if( CheckCurrentRangeEmpty( uRuleToDel ) == TRUE )
      {
         for( ii=uRuleToDel+1; ii<m_unNumRules; ii++ )
         {
            if( !m_pDeletedRulesArray[ ii ] && (
                ( m_pRules[ ii ].m_pRuleExpression->GetLeft() == m_pRules[ uRuleToDel ].m_pRuleExpression->GetRight() ) ) )
            {
               m_pRules[ ii ].m_pRuleExpression->SetLeft( 0 );
            }
         }
      }
   }
   else if( uRuleToDel >= nRightEdge )
   {
      // Right edge case
      // Set the right value (less than x) to infinity
      // But only if this is the only rule covering uRuleToDel's bw range.
      if( CheckCurrentRangeEmpty( uRuleToDel ) == TRUE )
      {
         for( ii=uRuleToDel-1; ii>=0; ii-- )
         {
            if( !m_pDeletedRulesArray[ ii ] && (
                ( m_pRules[ ii ].m_pRuleExpression->GetRight() == m_pRules[ uRuleToDel ].m_pRuleExpression->GetRight() ) ) )
            {
               m_pRules[ ii ].m_pRuleExpression->SetRight( RULE_VAL_INFINITY );
            }
         }
      }
   }
   else if( uRuleToDel > nLeftEdge )
   {
      // Non-edge case
      // Set all "left-adjacent" rules "right-hand" value to nRight.
      // But only if this is the only rule covering uRuleToDel's bw range.
      if( CheckCurrentRangeEmpty( uRuleToDel ) == FALSE )
      {
         // Determine the value of our right-hand value.
         int nRight = (int) m_pRules[ uRuleToDel ].m_pRuleExpression->GetRight();

         for( ii=uRuleToDel-1; ii>=0; ii-- )
         {
            if( !m_pDeletedRulesArray[ ii ] && (
	        ( m_pRules[ ii ].m_pRuleExpression->GetRight() == m_pRules[ uRuleToDel ].m_pRuleExpression->GetLeft() ) ) )
            {
               m_pRules[ ii ].m_pRuleExpression->SetRight( nRight );
            }
         }
      }
   }

   m_pDeletedRulesArray[uRuleToDel] = TRUE;
   return HXR_OK;
}

void
ASMRuleExpression::SetLeft( int nLeft )
{
   int nRight = ((IntegerNode*) ((VariableNode*)m_pHead->m_pRight))->m_Data;
   if( nRight == 1 )
   {
      ((IntegerNode*)(m_pHead->m_pLeft->m_pRight))->m_Data = nLeft;
   }
}

void
ASMRuleExpression::SetRight( int nRight )
{
   int nTmpRight = 0;
   if( m_pHead && m_pHead->m_pRight )
   {
      nTmpRight = ((IntegerNode*) ((VariableNode*)m_pHead->m_pRight))->m_Data;
   }

   if( nTmpRight == 1 )
   {
      ( (IntegerNode*)((VariableNode*) ((VariableNode*)m_pHead->m_pRight)->m_pRight) )->m_Data = nRight;
   }
   else if( nTmpRight != 0 )
   {
      ((VariableNode*)m_pHead->m_pRight)->m_Data = (char*)nRight;
   }
}

float
ASMRuleExpression::GetLeft()
{
   int nLeft = 0;
   int nRight = 0;
   if( m_pHead && m_pHead->m_pRight )
   {
      nRight = ((IntegerNode*) ((VariableNode*)m_pHead->m_pRight))->m_Data;
   }
   if( nRight == 1 )
   {
      nLeft = ((IntegerNode*) ((VariableNode*)m_pHead->m_pLeft->m_pRight))->m_Data;
   }
   return (float)nLeft;
}

float
ASMRuleExpression::GetRight()
{
   int nRight = 0;
   if( m_pHead && m_pHead->m_pRight )
   {
      nRight = ((IntegerNode*) ((VariableNode*)(m_pHead->m_pRight)))->m_Data;
   }
   if( nRight == 1 )
   {
      nRight = ((IntegerNode*) ((VariableNode*)m_pHead->m_pRight->m_pRight))->m_Data;
   }
   return (float)nRight;
}

int
ASMRuleExpression::GetOperatorAsInt()
{
   return (int) ((OperatorNode*) m_pHead)->m_Data;
}

// This function checks to see if the current rule's operator is GREATER or
// GREATEROREQUAL, both of which would suggest that we are the "right edge"
// rule.
BOOL
ASMRuleExpression::IsRightEdge()
{
   if( m_pHead )
   {
      switch(((OperatorNode*)m_pHead)->m_Data)
      {
	  case HX_RE_GREATER:
	  case HX_RE_GREATEREQUAL:
	      return TRUE;
	      break;

          default:
	      return FALSE;
	      break;
      }
   }
   else
   {
      return FALSE;
   }
}

HX_RESULT
ASMRuleBook::Reset()
{
    int i = 0;
    { //XXXSMPNOW
	BOOL bSeenExpression = 0;

	//printf ("******* Rule %d\n", i);

	const char* pRuleBook = m_pRuleBook;
	while (*pRuleBook)
	{
	    char pTemp[2048 + 1];
	    int  n		 = 0;
	    BOOL bSingleQuote 	 = 0;
	    BOOL bDoubleQuote	 = 0;

	    for (;((*pRuleBook) && (bDoubleQuote || ((*pRuleBook != ',') && (*pRuleBook != ';')))); pRuleBook++)
	    {
		if ((*pRuleBook == '\'') && (!bDoubleQuote))
		    bSingleQuote = !bSingleQuote;
		if ((*pRuleBook == '"') && (!bSingleQuote))
		    bDoubleQuote = !bDoubleQuote;

		// Kill whitespace outside of quotes
		if (bSingleQuote || bDoubleQuote || (
			(*pRuleBook != ' ') &&
			(*pRuleBook != '\n') &&
			(*pRuleBook != '\r') &&
			(*pRuleBook != '\t')))
		{
		    pTemp[n++] = *pRuleBook;
		    if (n >= 2048)
		    {
			//printf ("Panic: Rule Property %d too long\n", i);
			HX_ASSERT(0);
			break;
		    }
		}
	    }
	    pTemp[n] = 0;

	    if ((*pRuleBook == ',') || (*pRuleBook == ';'))
	    {
		// Rule is Valid!

	    	if (*pTemp == '#')
		{
		    // This part of the rule is an expression
		    if (!bSeenExpression)
		    {
			m_pRules[i].SetExpression(pTemp + 1);
			m_pRules[i].Dump();
			bSeenExpression = 1;
			m_ulNumThresholds += m_pRules[i].m_pRuleExpression->GetNumThresholds();
		    }
		    else
		    {
			//printf ("Panic: Two expressions in Rule %d\n", i);
			HX_ASSERT(0);
		    }
		}
		else
		{
                    char *pProp;
                    char *pValue;

                    pProp  = pTemp;
                    pValue = pTemp;

                    while ((*pValue != '=') && (pValue-pTemp < ((int) strlen(pTemp))))
                    pValue++;

                    if (*pValue == '=')
                    {
                        *pValue++ = '\0';
                    }
                    else
                    {
                        pValue = NULL;
                    }

                    if (pValue)
                    {
                        IHXBuffer* pBuffer = new CHXBuffer;
                        if(!pBuffer)
                        {
                            return HXR_OUTOFMEMORY;
                        }

                        pBuffer->AddRef();

                        /* Strip Outside Quotes */
                        if (*pValue == '"')
                        {
                            pValue++;
                            int end = (strlen(pValue) ? strlen(pValue)-1 : 0);
                            HX_ASSERT(pValue[end] == '"');
                            pValue[end] = 0;
                        }

                        HX_RESULT theErr = 
                        pBuffer->Set((const unsigned char *)pValue,
                        strlen(pValue) + 1);

                        if( theErr == HXR_OUTOFMEMORY )
                        {
                            pBuffer->Release();
                            return theErr;
                        }

                        //printf ("Property '%s'--'%s'\n", pProp, pValue);

                        if( m_pRules[i].m_pRuleProps )
                        {
                            m_pRules[i].m_pRuleProps->
                            SetPropertyCString(pProp, pBuffer);
                        }

                        pBuffer->Release();
                    }
		}

		if (*pRuleBook == ';')
		{
		    i++;
		    bSeenExpression = 0;
                    if (i >= m_unNumRules)
                    {
                        break;
                    }
		    //printf ("******* Rule %d\n", i);
		}
		pRuleBook++;
	    }
	}
    }

    return InitRulesArray();
}

BOOL
ASMRuleBook::CheckCurrentRangeEmpty( int uRuleToDel )
{
    for( int ii=0; ii<m_unNumRules; ii++ )
    {
        // But only if this is the only rule covering uRuleToDel's bw range.
        if( uRuleToDel != ii && !m_pDeletedRulesArray[ ii ] &&
            ( m_pRules[ ii ].m_pRuleExpression->GetLeft() == m_pRules[ uRuleToDel ].m_pRuleExpression->GetLeft() ) &&
            ( m_pRules[ ii ].m_pRuleExpression->GetRight() == m_pRules[ uRuleToDel ].m_pRuleExpression->GetRight() ) &&
            ( m_pRules[ ii ].m_pRuleExpression->GetOperatorAsInt() == m_pRules[ uRuleToDel ].m_pRuleExpression->GetOperatorAsInt() ) )
        {
            return FALSE;
        }
    }

    return TRUE;
}