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/*
* This file is part of libESMTP, a library for submission of RFC 2822
* formatted electronic mail messages using the SMTP protocol described
* in RFC 2821.
*
* Copyright (C) 2001,2002 Brian Stafford <brian@stafford.uklinux.net>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/* Standard callback functions for use by message-source.c
An application requiring anything more sophisticated than either of
these will need to supply its own callback. */
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "libesmtp.h"
#define BUFLEN 8192
/**
* DOC: Message Callbacks.
*
* Message Callbacks
* -----------------
*
* libESMTP provides basic message callbacks to handle two common cases,
* reading from a file and reading from a string. In both cases the message
* *must* be formatted according to RFC 5322 and lines *must* be terminated
* with the canonical CRLF sequence. Furthermore, RFC 5321 line length
* limitations must be observed (1000 octets maximum).
*/
/**
* _smtp_message_fp_cb() - Read message from a file.
* @ctx: context data for the message.
* @len: length of message data returned to the application.
* @arg: application data (closure) passed to the callback.
*
* Callback function to read the message from a file.
*
* Return: A pointer to message data which remains valid until the next call.
*/
const char *
_smtp_message_fp_cb (void **ctx, int *len, void *arg)
{
if (*ctx == NULL)
*ctx = malloc (BUFLEN);
if (len == NULL)
{
rewind ((FILE *) arg);
return NULL;
}
*len = fread (*ctx, 1, BUFLEN, (FILE *) arg);
return *ctx;
}
struct state
{
int state;
int length;
};
/**
* _smtp_message_str_cb() - Read message from a string.
* @ctx: context data for the message.
* @len: length of message data returned to the application.
* @arg: application data (closure) passed to the callback.
*
* Callback function to read the message from a string.
*
* Return: A pointer to message data which remains valid until the next call.
*/
const char *
_smtp_message_str_cb (void **ctx, int *len, void *arg)
{
const char *string = arg;
struct state *state;
if (*ctx == NULL)
*ctx = malloc (sizeof (struct state));
state = *ctx;
if (len == NULL)
{
state->state = 0;
state->length = strlen (string);
return NULL;
}
switch (state->state)
{
case 0:
state->state = 1;
*len = state->length;
break;
default:
*len = 0;
break;
}
return string;
}
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