🚀 go-pugleaf

I'm writing an ISAPI Filter for IIS4 or 5 that is supposed to add some
source code inside an HTML page that has to be served. It increases the size
of the page of 1 or 2 Ko.
I've caught the SF_NOTIFY_SEND_RAW_DATA event to add my code in several
places of the HTML source of the page.
I know the handler is called 2 times for each file sent to the browser.
    - 1 - to send the header (with the page size)
    - 2 - to send the data

The first time I adjust the size of the "content-length" field of the
header.
The second time I put my own HTML code inside the page in a new buffer
bigger than the buffer provided in the HTTP_FILTER_RAW_DATA instance
provided by the framework. So I replace it by a new buffer assigned by the
AllocMem() function, I change the pRawData->pvInData and the
pRawData->cbInData values to the new values.

But my browser keeps waiting for the end of the page to be sent. I checked
everything about the sizes and it is good. I must miss something but I don't
know what. Some help would be very appreciated. Thanks in advance. I further
provide some of my code to better visualize the function...
-----

Jean-Marc Geindre

filter.cpp
DWORD CMy2Filter::OnSendRawData(CHttpFilterContext* pCtxt,
PHTTP_FILTER_RAW_DATA pRawData)
{
 // is it HTML (Allocated on OnMapUrl() ) ?
 if (pCtxt->m_pFC->pFilterContext) {
  char *buffer=(char *)pRawData->pvInData;

  if (strstr(buffer,"HTTP/1"))
  {
   // Is it the Header to be sent ?
   char *before=strstr(buffer,"Content-Length: ");
    // ...
    // I change the numeric val of content-length
    // copy the size into the buffer
    sprintf(buffer, "%s%d%s", before, iSize, after);

    // I save the size for the next call of the handler
    // The buffer has been allocated with the size of 1*sizeof(int)
    // in the OnMapUrl() handler with AllocMem()
    int *ptr=(int *)(pCtxt->m_pFC->pFilterContext);
    ptr[0]=iSize;
   }
  } else {
    // Second call, the content-length has been modified the prev call
   char *newBuffer;
    // I get the size from pFilterContext filled the first time
   int *iTmpBuf=(int *)pCtxt->m_pFC->pFilterContext;
   int newBufLength=iTmpBuf[0];
   newBuffer=(CHAR*)pCtxt->AllocMem(newBufLength, (DWORD)NULL);
   memset(newBuffer, ' ', newBufLength);
   int indexBuffer=0;
    //...
    // I put my codes
    // ...
    // I close the buffer like a normal string
   newBuffer[newBufLength]=NULL;
   // Copy of the new buffer
   pRawData->pvInData=(void*)newBuffer;
   pRawData->cbInData=newBufLength;
   pCtxt->m_pFC->pFilterContext=NULL;
  }
 }
 return SF_STATUS_REQ_NEXT_NOTIFICATION;
}