XcursorXcFileSave (XcursorFile		    *file,
		   const XcursorComments    *comments,
		   const XcursorImages	    *images)
{
    XcursorFileHeader	*fileHeader;
    XcursorUInt		position;
    int			n;
    int			toc;

    if (!file || !comments || !images)
        return XcursorFalse;

    fileHeader = _XcursorFileHeaderCreate (comments->ncomment + images->nimage);
    if (!fileHeader)
	return XcursorFalse;

    position = _XcursorFileHeaderLength (fileHeader);

    /*
     * Compute the toc.  Place the images before the comments
     * as they're more often read
     */

    toc = 0;
    for (n = 0; n < images->nimage; n++)
    {
	fileHeader->tocs[toc].type = XCURSOR_IMAGE_TYPE;
	fileHeader->tocs[toc].subtype = images->images[n]->size;
	fileHeader->tocs[toc].position = position;
	position += _XcursorImageLength (images->images[n]);
	toc++;
    }

    for (n = 0; n < comments->ncomment; n++)
    {
	fileHeader->tocs[toc].type = XCURSOR_COMMENT_TYPE;
	fileHeader->tocs[toc].subtype = comments->comments[n]->comment_type;
	fileHeader->tocs[toc].position = position;
	position += _XcursorCommentLength (comments->comments[n]);
	toc++;
    }

    /*
     * Write the header and the toc
     */
    if (!_XcursorWriteFileHeader (file, fileHeader))
	goto bail;

    /*
     * Write the images
     */
    toc = 0;
    for (n = 0; n < images->nimage; n++)
    {
	if (!_XcursorWriteImage (file, fileHeader, toc, images->images[n]))
	    goto bail;
	toc++;
    }

    /*
     * Write the comments
     */
    for (n = 0; n < comments->ncomment; n++)
    {
	if (!_XcursorWriteComment (file, fileHeader, toc, comments->comments[n]))
	    goto bail;
	toc++;
    }

    _XcursorFileHeaderDestroy (fileHeader);
    return XcursorTrue;
bail:
    _XcursorFileHeaderDestroy (fileHeader);
    return XcursorFalse;
}

The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.