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/* GNU Mailutils -- a suite of utilities for electronic mail
Copyright (C) 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, 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 GNU Mailutils. If not, see <http://www.gnu.org/licenses/>. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdlib.h>
#include <string.h>
#include <mailutils/errno.h>
#include <mailutils/filter.h>
struct _mu_linelen_filter
{
size_t max_len;
size_t cur_len;
};
static enum mu_filter_result
_ll_encoder (void *xd,
enum mu_filter_command cmd,
struct mu_filter_io *iobuf)
{
struct _mu_linelen_filter *flt = xd;
const char *iptr;
size_t isize;
char *optr;
size_t osize;
size_t consumed, written;
switch (cmd)
{
case mu_filter_init:
flt->cur_len = 0;
case mu_filter_done:
return mu_filter_ok;
default:
break;
}
iptr = iobuf->input;
isize = iobuf->isize;
optr = iobuf->output;
osize = iobuf->osize;
for (consumed = written = 0; consumed < isize && written < osize; )
{
char *p;
size_t rest = flt->max_len - flt->cur_len;
size_t len = isize - consumed;
if (len > rest)
len = rest;
p = memchr (iptr + consumed, '\n', len);
if (p)
len = p - iptr - consumed + 1;
rest = osize - written;
if (len > rest)
{
len = rest;
p = NULL;
}
memcpy (optr + written, iptr + consumed, len);
written += len;
consumed += len;
if (p)
flt->cur_len = 0;
else
{
flt->cur_len += len;
if (flt->cur_len == flt->max_len)
{
if (written < osize)
optr[written++] = '\n';
flt->cur_len = 0;
}
}
}
iobuf->isize = consumed;
iobuf->osize = written;
return mu_filter_ok;
}
int
mu_linelen_filter_create (mu_stream_t *pstream, mu_stream_t stream,
size_t limit,
int flags)
{
struct _mu_linelen_filter *flt = calloc (1, sizeof (*flt));
if (!flt)
return ENOMEM;
flt->max_len = limit;
return mu_filter_stream_create (pstream, stream,
MU_FILTER_ENCODE, _ll_encoder, flt, flags);
}
static int
alloc_state (void **pret, int mode MU_ARG_UNUSED, int argc, const char **argv)
{
struct _mu_linelen_filter *flt = malloc (sizeof (flt[0]));
if (!flt)
return ENOMEM;
flt->cur_len = 0;
flt->max_len = 76;
if (argc > 1)
{
char *p;
flt->max_len = strtoul (argv[1], &p, 10);
if (*p)
{
free (flt);
return MU_ERR_PARSE;
}
}
*pret = flt;
return 0;
}
static struct _mu_filter_record _linelen_filter = {
"LINELEN",
alloc_state,
_ll_encoder,
NULL,
};
mu_filter_record_t mu_linelen_filter = &_linelen_filter;
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