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/* GNU Mailutils -- a suite of utilities for electronic mail
Copyright (C) 1999, 2000, 2001, 2005, 2007 Free Software Foundation, Inc.
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 3 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., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301 USA */
/* First draft by Alain Magloire */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdlib.h>
#include <errno.h>
#include <mailutils/property.h>
#include <mailutils/stream.h>
#include <filter0.h>
static int rfc822_init (mu_filter_t);
static void rfc822_destroy (mu_filter_t);
static int rfc822_read (mu_filter_t, char *, size_t, mu_off_t, size_t *);
static int rfc822_readline (mu_filter_t, char *, size_t, mu_off_t, size_t *);
static int rfc822_read0 (mu_filter_t, char *, size_t, mu_off_t, size_t *, int);
struct rfc822
{
mu_off_t r_offset; /* rfc822 offset. */
mu_off_t s_offset; /* stream offset. */
size_t lines;
int residue;
};
static struct _mu_filter_record _rfc822_filter =
{
"RFC822",
rfc822_init,
NULL,
NULL,
NULL,
};
/* Exported. */
mu_filter_record_t mu_rfc822_filter = &_rfc822_filter;
static int
rfc822_init (mu_filter_t filter)
{
mu_property_t property;
int status;
filter->data = calloc (1, sizeof (struct rfc822));
if (filter->data == NULL)
return ENOMEM;
filter->_read = rfc822_read;
filter->_readline = rfc822_readline;
filter->_destroy = rfc822_destroy;
/* We are interested in this property. */
if ((status = mu_stream_get_property (filter->filter_stream, &property) != 0)
|| (status = mu_property_set_value (property, "LINES", "0", 1)) != 0)
{
free (filter->data);
filter->data = NULL;
return status;
}
return 0;
}
static void
rfc822_destroy (mu_filter_t filter)
{
if (filter->data)
free (filter->data);
}
static int
rfc822_read (mu_filter_t filter, char *buffer, size_t buflen,
mu_off_t off, size_t *pnread)
{
return rfc822_read0 (filter, buffer, buflen, off, pnread, 0);
}
static int
rfc822_readline (mu_filter_t filter, char *buffer, size_t buflen,
mu_off_t off, size_t *pnread)
{
return rfc822_read0 (filter, buffer, buflen, off, pnread, 1);
}
/* RFC 822 converter "\n" --> "\r\n"
We maintain to offset, the rfc822 offset (r_offset) and the offset of
the stream (s_offset). If they do not match we go back as for as possible
and start to read by 1 'till we reach the current offset. */
static int
rfc822_read0 (mu_filter_t filter, char *buffer, size_t buflen,
mu_off_t off, size_t *pnread, int isreadline)
{
size_t total = 0;
int status = 0;
struct rfc822 *rfc822 = filter->data;
/* Catch up i.e bring us to the current offset. */
if (rfc822->r_offset != off)
{
rfc822->residue = 0;
/* Try to find a starting point. */
if (rfc822->lines)
{
rfc822->r_offset = off - rfc822->lines;
if (rfc822->r_offset < 0)
rfc822->r_offset = 0;
}
else
rfc822->r_offset = 0;
rfc822->s_offset = rfc822->r_offset;
while (rfc822->r_offset < off)
{
char c;
size_t n = 0;
status = mu_stream_read (filter->stream, &c, 1, rfc822->s_offset, &n);
if (status != 0)
return status;
if (n == 0)
{
if (pnread)
*pnread = 0;
return 0;
}
if (c == '\n')
{
rfc822->r_offset++;
if (rfc822->r_offset == off)
{
rfc822->residue = 1;
break;
}
}
rfc822->r_offset++;
rfc822->s_offset++;
}
}
do
{
size_t nread = 0;
status = mu_stream_readline (filter->stream, buffer, buflen,
rfc822->s_offset, &nread);
if (status != 0)
return status;
if (nread == 0)
break;
rfc822->r_offset += nread;
rfc822->s_offset += nread;
total += nread;
buflen -= nread;
if (buffer[nread - 1] == '\n')
{
if (!rfc822->residue)
{
buffer[nread - 1] = '\r';
if (buflen == 0)
{
rfc822->residue = 1;
break;
}
buffer[nread] = '\n';
buflen--;
nread++;
total++;
rfc822->r_offset++;
}
else
rfc822->residue = 0;
}
buffer += nread;
} while (buflen > 0 && !isreadline);
if (isreadline && buffer)
*buffer = '\0';
if (pnread)
*pnread = total;
return status;
}
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