header.c
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/* Message header filter for GNU Mailutils.
Copyright (C) 2010-2012, 2014-2015 Free Software Foundation, Inc.
GNU Mailutils is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GNU Mailutils 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Mailutils. If not, see <http://www.gnu.org/licenses/>. */
/* This filter reads the input data up to the first empty line (i.e. \n\n).
It is suitable to extract headers from RFC822 messages.
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdlib.h>
#include <string.h>
#include <mailutils/errno.h>
#include <mailutils/filter.h>
#include <mailutils/cctype.h>
enum hflt_state
{
hflt_initial,
hflt_newline,
hflt_copy
};
static int
new_state (int *pd, unsigned c)
{
switch (*pd)
{
case hflt_initial:
case hflt_copy:
*pd = (c == '\n') ? hflt_newline : hflt_copy;
break;
case hflt_newline:
if (c == '\n')
return 1;
*pd = hflt_copy;
break;
}
return 0;
}
static enum mu_filter_result
_hflt_decoder (void *xd, enum mu_filter_command cmd,
struct mu_filter_io *iobuf)
{
int *pd = xd;
size_t i, j;
const unsigned char *iptr;
size_t isize;
char *optr;
size_t osize;
switch (cmd)
{
case mu_filter_init:
*pd = hflt_initial;
return mu_filter_ok;
case mu_filter_done:
return mu_filter_ok;
default:
break;
}
iptr = (const unsigned char *) iobuf->input;
isize = iobuf->isize;
optr = iobuf->output;
osize = iobuf->osize;
for (i = j = 0; i < isize && j < osize; i++)
{
unsigned char c = *iptr++;
if (new_state (pd, c))
{
iobuf->eof = 1;
break;
}
optr[j++] = c;
}
iobuf->isize = i;
iobuf->osize = j;
return mu_filter_ok;
}
static int
alloc_state (void **pret, int mode MU_ARG_UNUSED,
int argc MU_ARG_UNUSED, const char **argv MU_ARG_UNUSED)
{
int *pd = malloc (sizeof (*pd));
if (!pd)
return ENOMEM;
*pret = pd;
return 0;
}
static struct _mu_filter_record _header_filter = {
"HEADER",
alloc_state,
NULL,
_hflt_decoder
};
mu_filter_record_t mu_header_filter = &_header_filter;