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/* GNU Mailutils -- a suite of utilities for electronic mail
Copyright (C) 1999-2001, 2004-2005, 2007, 2009-2012 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, see
<http://www.gnu.org/licenses/>. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <errno.h>
#include <string.h>
#include <stdlib.h>
#include <mailutils/filter.h>
#include <mailutils/stream.h>
#include <mailutils/errno.h>
static int
negate_filter_mode (int mode)
{
if (mode == MU_FILTER_DECODE)
return MU_FILTER_ENCODE;
else if (mode == MU_FILTER_ENCODE)
return MU_FILTER_DECODE;
abort ();
}
static int
_add_next_link (mu_stream_t *pret, mu_stream_t transport,
int defmode, int flags,
size_t argc, char **argv,
int (*pred) (void *, mu_stream_t, const char *),
void *closure)
{
int mode;
int qmark = 0;
char *fltname;
int status = 0;
fltname = argv[0];
if (fltname[0] == '?')
{
if (pred)
qmark = 1;
fltname++;
}
if (fltname[0] == '~')
{
mode = negate_filter_mode (defmode);
fltname++;
}
else
mode = defmode;
if (qmark == 0 || pred (closure, transport, fltname))
{
status = mu_filter_create_args (pret, transport, fltname,
argc, (const char **)argv,
mode, flags);
mu_stream_unref (transport);
}
return status;
}
int
_filter_chain_create (mu_stream_t *pret, mu_stream_t transport,
int defmode,
int flags,
size_t argc, char **argv,
int (*pred) (void *, mu_stream_t, const char *),
void *closure)
{
while (argc)
{
size_t i;
int status;
mu_stream_t stream;
for (i = 1; i < argc; i++)
if (strcmp (argv[i], "+") == 0)
break;
status = _add_next_link (&stream, transport,
defmode, flags,
i, argv,
pred, closure);
if (status)
return status;
transport = stream;
argc -= i;
argv += i;
if (argc)
{
argc--;
argv++;
}
}
*pret = transport;
return 0;
}
int
_filter_chain_create_rev (mu_stream_t *pret, mu_stream_t transport,
int defmode,
int flags,
size_t argc, char **argv,
int (*pred) (void *, mu_stream_t, const char *),
void *closure)
{
size_t pos;
for (pos = argc; pos > 0;)
{
size_t i;
int status;
mu_stream_t stream;
for (i = pos; i > 0; i--)
{
if (strcmp (argv[i - 1], "+") == 0)
break;
}
status = _add_next_link (&stream, transport,
defmode, flags,
pos - i, argv + i,
pred, closure);
if (status)
return status;
transport = stream;
if (i > 0)
i--;
pos = i;
}
*pret = transport;
return 0;
}
int
mu_filter_chain_create_pred (mu_stream_t *pret, mu_stream_t transport,
int defmode,
int flags,
size_t argc, char **argv,
int (*pred) (void *, mu_stream_t, const char *),
void *closure)
{
int rc;
mu_stream_ref (transport);
if (flags & MU_STREAM_WRITE)
rc = _filter_chain_create_rev (pret, transport,
defmode, flags,
argc, argv,
pred, closure);
else
rc = _filter_chain_create (pret, transport,
defmode, flags,
argc, argv, pred, closure);
if (rc)
mu_stream_unref (transport);
return rc;
}
int
mu_filter_chain_create (mu_stream_t *pret, mu_stream_t transport,
int defmode, int flags,
size_t argc, char **argv)
{
return mu_filter_chain_create_pred (pret, transport, defmode, flags,
argc, argv, NULL, NULL);
}
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