Function xmlBufGrowInternal

ThirdParty/libxml2/vtklibxml2/buf.c:375–430

* xmlBufGrowInternal: * @buf: the buffer * @len: the minimum free size to allocate * * Grow the available space of an XML buffer, @len is the target value * Error checking should be done on buf->error since using the return * value doesn't work that well * * Returns 0 in case of error or the length made available otherwise */

 * Returns 0 in case of error or the length made available otherwise
 */
static size_t
xmlBufGrowInternal(xmlBufPtr buf, size_t len) {
    size_t size;
    xmlChar *newbuf;

    if ((buf == NULL) || (buf->error != 0)) return(0);
    CHECK_COMPAT(buf)

    if (len < buf->size - buf->use)
        return(buf->size - buf->use - 1);
    if (len >= SIZE_MAX - buf->use) {
        xmlBufMemoryError(buf);
        return(0);
    }

    if (buf->size > (size_t) len) {
        size = buf->size > SIZE_MAX / 2 ? SIZE_MAX : buf->size * 2;
    } else {
        size = buf->use + len;
        size = size > SIZE_MAX - 100 ? SIZE_MAX : size + 100;
    }

    if (buf->alloc == XML_BUFFER_ALLOC_BOUNDED) {
        /*
	 * Used to provide parsing limits
	 */
        if ((buf->use + len + 1 >= XML_MAX_TEXT_LENGTH) ||
	    (buf->size >= XML_MAX_TEXT_LENGTH)) {
	    xmlBufMemoryError(buf);
	    return(0);
	}
	if (size >= XML_MAX_TEXT_LENGTH)
	    size = XML_MAX_TEXT_LENGTH;
    }
    if ((buf->alloc == XML_BUFFER_ALLOC_IO) && (buf->contentIO != NULL)) {
        size_t start_buf = buf->content - buf->contentIO;

	newbuf = (xmlChar *) xmlRealloc(buf->contentIO, start_buf + size);
	if (newbuf == NULL) {
	    xmlBufMemoryError(buf);
	    return(0);
	}
	buf->contentIO = newbuf;
	buf->content = newbuf + start_buf;
    } else {
	newbuf = (xmlChar *) xmlRealloc(buf->content, size);
	if (newbuf == NULL) {
	    xmlBufMemoryError(buf);
	    return(0);
	}
	buf->content = newbuf;
    }
    buf->size = size;
    UPDATE_COMPAT(buf)
    return(buf->size - buf->use - 1);
}

/**