Function mime_state_head

lib_acl_cpp/src/mime/internal/mime_state_parse.cpp:513–610

�����ʼ�ͷ�� multipart �����ֵ�ͷ

// �����ʼ�ͷ�� multipart �����ֵ�ͷ
static int mime_state_head(MIME_STATE *state, const char *s, int n)
{
	MIME_NODE *node = state->curr_node;

	if (n <= 0)
		return n;

	/* �����δ�ҵ����з�������� */

	if (node->last_lf != '\n') {
		while (n > 0) {
			node->last_ch = *s;
			ADDCH(node->buffer, node->last_ch);
			n--;
			state->curr_off++;

			if (node->last_ch == '\n') {
				node->last_lf = '\n';
				break;
			}
			s++;
		}

		return n;
	}

	/* ��������Ի��п�ʼ�� ˵����ǰ���ʼ�ͷ���� */

	if (*s == '\n') {
		/* �ϴ�����Ϊ: \n\r �� \n */

		state->curr_off++;
		node->header_end = state->curr_off;

		if (LEN(node->buffer) > 0) {
			/* ����ͷ�������һ������ */
			mime_header_line(node);
			node->valid_line++;
		}

		/* �Թ���ͷ���õĿ��� */
		if (node->valid_line == 0)
			return 0;

		/* �����ǰ���Ϊ multipart ��ʽ, ������ state->curr_bound */
		if (node->boundary != NULL)
			state->curr_bound = STR(node->boundary);
		state->curr_status = MIME_S_BODY;
		node->body_begin = state->curr_off;
		return n - 1;
	}
	if (*s == '\r') {
		state->curr_off++;
		if (node->last_ch == '\r') {
			/* XXX: ������ \n\r\r ���� */
			node->last_ch = '\r';
			node->last_lf = 0;
			return n - 1;