Bug 250000 Remove string copying in |nsIMAPGenericParser::AdvanceTokenizerStartingPoint()|

    HandleMemoryFailure();

}

// advances |fLineOfTokens| by |bytesToAdvance| bytes

void nsIMAPGenericParser::AdvanceTokenizerStartingPoint(int32 bytesToAdvance)

{

  PRInt32 startingDiff = fLineOfTokens - fStartOfLineOfTokens;

  PRInt32 nextTokenOffset;

  NS_PRECONDITION(bytesToAdvance>=0, "bytesToAdvance must not be negative");

  if(!fStartOfLineOfTokens)

      return;

  // save off offset into fStartOfLineOfTokens of fNextToken so we can set it appropriately

  // when we destroy the current line and create a new one. I'm pretty sure fNextToken must

  // point somewhere in the current line.

  nextTokenOffset = fNextToken - fStartOfLineOfTokens;

  PR_FREEIF(fStartOfLineOfTokens);

  if (fCurrentLine)

  // In the last call to GetNextToken(), the token separator was cleared to '\0'

  // iff |fCurrentTokenPlaceHolder|.  We must recover this token separator now.

  if (fCurrentTokenPlaceHolder)

  {

    fStartOfLineOfTokens = PL_strdup(fCurrentLine);

    fNextToken = fStartOfLineOfTokens + nextTokenOffset;

    int endTokenOffset = fCurrentTokenPlaceHolder - fStartOfLineOfTokens - 1;

    if (endTokenOffset >= 0)

      fStartOfLineOfTokens[endTokenOffset] = fCurrentLine[endTokenOffset];

  }

    if (fStartOfLineOfTokens && ((int32) strlen(fStartOfLineOfTokens) >= bytesToAdvance))

    {

      fLineOfTokens = fStartOfLineOfTokens + bytesToAdvance  + startingDiff;

  NS_ASSERTION(bytesToAdvance + (fLineOfTokens-fStartOfLineOfTokens) <=

    (int32)strlen(fCurrentLine), "cannot advance beyond end of fLineOfTokens");

  fLineOfTokens += bytesToAdvance;

  fCurrentTokenPlaceHolder = fLineOfTokens;

  fTokenizerAdvanced = PR_TRUE;

}

    else

      HandleMemoryFailure();

  }

  else

    HandleMemoryFailure();

}

// Lots of things in the IMAP protocol are defined as an "astring."

// An astring is either an atom or a string.