/*
 * Copyright (c) 2002-2005 Sendmail, Inc. and its suppliers.
 *	All rights reserved.
 *
 * By using this file, you agree to the terms and conditions set
 * forth in the LICENSE file which can be found at the top level of
 * the sendmail distribution.
 */

#include "sm/generic.h"
SM_RCSID("@(#)$Id: rcbopen2.c,v 1.8 2005/06/02 19:00:36 ca Exp $")

#include "sm/assert.h"
#include "sm/magic.h"
#include "sm/memops.h"
#include "sm/rpool.h"
#include "sm/str-int.h"
#include "sm/rcb.h"
#include "sm/str2rcb.h"
#include "sm/reccom.h"

/*
**  SM_RCB_OPEN_RCVN -- Open rcb for receiving data from file.
**
**	Parameters:
**		rcb -- sm_rcb_P object.
**
**	Returns:
**		SM_SUCCESS
*/

sm_ret_T
sm_rcb_open_rcvn(sm_rcb_P rcb)
{
	SM_IS_RCB(rcb);
	SM_REQUIRE(rcb->sm_rcb_base != NULL);
	rcb->sm_rcb_len = 0;
	rcb->sm_rcb_rw = -1;
#if SM_RCB_CHECK
	rcb->sm_rcb_state = SM_RCB_RCV;
#endif
	return SM_SUCCESS;
}

/*
**  SM_RCB_OPEN_DECN -- Open rcb for decoding data.
**
**	Parameters:
**		rcb -- sm_rcb_P object.
**
**	Returns:
**		SM_SUCCESS
*/

sm_ret_T
sm_rcb_open_decn(sm_rcb_P rcb)
{
	SM_IS_RCB(rcb);
	SM_REQUIRE(rcb->sm_rcb_base != NULL);
	rcb->sm_rcb_rw = 0;
#if SM_RCB_CHECK
	rcb->sm_rcb_state = SM_RCB_DEC;
#endif
	return SM_SUCCESS;
}

/*
**  SM_RCB_OPEN_ENCN -- Open rcb for encoding data into it.
**
**	Parameters:
**		rcb -- sm_rcb_P object.
**		n -- required size.
**
**	Returns:
**		SM_SUCCESS
*/

sm_ret_T
sm_rcb_open_encn(sm_rcb_P rcb, int n)
{
	SM_IS_RCB(rcb);
	SM_REQUIRE(rcb->sm_rcb_base != NULL);
	rcb->sm_rcb_len = 0;
	if (n > 0 && (uint)n > rcb->sm_rcb_size)
	{
		uint u;

		u = (uint)n;
		SM_STR_INCREASE_R(rcb, u);
	}
	rcb->sm_rcb_rw = n;
#if SM_RCB_CHECK
	rcb->sm_rcb_state = SM_RCB_ENC;
#endif
	return SM_SUCCESS;
}

/*
**  SM_RCB_OPEN_SNDN -- Open rcb for sending data from it.
**
**	Parameters:
**		rcb -- sm_rcb_P object.
**
**	Returns:
**		SM_SUCCESS
*/

sm_ret_T
sm_rcb_open_sndn(sm_rcb_P rcb)
{
	SM_IS_RCB(rcb);
	SM_REQUIRE(rcb->sm_rcb_base != NULL);
	rcb->sm_rcb_rw = 0;
#if SM_RCB_CHECK
	rcb->sm_rcb_state = SM_RCB_SND;
#endif
	return SM_SUCCESS;
}

/*
**  SM_RCB_CLOSE_RCVN -- Close rcb after receiving data from file.
**
**	Parameters:
**		rcb -- sm_rcb_P object.
**
**	Returns:
**		SM_SUCCESS
*/

sm_ret_T
sm_rcb_close_rcvn(sm_rcb_P rcb)
{
	SM_IS_RCB(rcb);
	SM_REQUIRE(rcb->sm_rcb_base != NULL);
	rcb->sm_rcb_rw = 0;
#if SM_RCB_CHECK
	rcb->sm_rcb_state = SM_RCB_NONE;
#endif
	return SM_SUCCESS;
}

/*
**  SM_RCB_CLOSE_DECN -- Close rcb after decoding data.
**
**	Parameters:
**		rcb -- sm_rcb_P object.
**
**	Returns:
**		SM_SUCCESS
*/

sm_ret_T
sm_rcb_close_decn(sm_rcb_P rcb)
{
	SM_IS_RCB(rcb);
	SM_REQUIRE(rcb->sm_rcb_base != NULL);
	rcb->sm_rcb_rw = 0;
#if SM_RCB_CHECK
	rcb->sm_rcb_state = SM_RCB_NONE;
#endif
	return SM_SUCCESS;
}

/*
**  SM_RCB_CLOSE_ENCN -- Close rcb after encoding data into it.
**
**	Parameters:
**		rcb -- sm_rcb_P object.
**
**	Returns:
**		usual sm_error code; EINVAL, etc
*/

sm_ret_T
sm_rcb_close_encn(sm_rcb_P rcb)
{
	uint32_t len;
#if SM_RCB_END_RCB
	sm_ret_T ret;
#endif

	SM_IS_RCB(rcb);
	SM_REQUIRE(rcb->sm_rcb_base != NULL);
#if SM_RCB_CHECK
	/* reset state even if an error occurs? */
	rcb->sm_rcb_state = SM_RCB_NONE;
#endif
	if (rcb->sm_rcb_len <= sizeof(int))
		return sm_error_perm(SM_EM_RECCOM, EINVAL);
#if SM_RCB_END_RCB
	ret = sm_rcb_put3uint32(rcb, 4, RT_END_OF_RCB, rcb->sm_rcb_len + 12);
	if (sm_is_err(ret))
		return ret;
#endif
	len = (uint32_t) (rcb->sm_rcb_len);
	sm_uint32_2buf(len, rcb->sm_rcb_base);
	return SM_SUCCESS;
}

/*
**  SM_RCB_CLOSE_SNDN -- Close rcb after sending data from it.
**
**	Parameters:
**		rcb -- sm_rcb_P object.
**
**	Returns:
**		SM_SUCCESS
*/

sm_ret_T
sm_rcb_close_sndn(sm_rcb_P rcb)
{
	SM_IS_RCB(rcb);
	SM_REQUIRE(rcb->sm_rcb_base != NULL);
	rcb->sm_rcb_rw = 0;
#if SM_RCB_CHECK
	rcb->sm_rcb_state = SM_RCB_NONE;
#endif
	return SM_SUCCESS;
}

/*
**  SM_RCB_CLOSE_N -- Close rcb (unconditionally).
**
**	Parameters:
**		rcb -- sm_rcb_P object.
**
**	Returns:
**		SM_SUCCESS
*/

sm_ret_T
sm_rcb_close_n(sm_rcb_P rcb)
{
	if (rcb == NULL)
		return SM_SUCCESS;
	SM_IS_RCB(rcb);
	rcb->sm_rcb_rw = 0;
#if SM_RCB_CHECK
	rcb->sm_rcb_state = SM_RCB_NONE;
#endif
	return SM_SUCCESS;
}