crlfflt.c
3.16 KB
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/* GNU Mailutils -- a suite of utilities for electronic mail
Copyright (C) 2009, 2010 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>
/* Move min(isize,osize) bytes from iptr to optr, replacing each \n
with \r\n. Store number of bytes written to optr in *pnbytes.
Return number of bytes read from iptr. */
static enum mu_filter_result
_crlf_encoder (void *xd MU_ARG_UNUSED,
enum mu_filter_command cmd,
struct mu_filter_io *iobuf)
{
size_t i, j;
const char *iptr = iobuf->input;
size_t isize = iobuf->isize;
char *optr = iobuf->output;
size_t osize = iobuf->osize;
switch (cmd)
{
case mu_filter_init:
case mu_filter_done:
return mu_filter_ok;
default:
break;
}
for (i = j = 0; i < isize && j < osize; i++)
{
unsigned char c = *(unsigned char*)iptr++;
if (c == '\n')
{
if (j + 1 == osize)
{
if (i == 0)
{
iobuf->osize = 2;
return mu_filter_moreoutput;
}
break;
}
optr[j++] = '\r';
optr[j++] = '\n';
}
/*else if (c == '\r')*/
else
optr[j++] = c;
}
iobuf->isize = i;
iobuf->osize = j;
return mu_filter_ok;
}
/* Move min(isize,osize) bytes from iptr to optr, replacing each \r\n
with \n. Store number of bytes written to optr in *pnbytes.
Return number of bytes read from iptr. */
static enum mu_filter_result
_crlf_decoder (void *xd MU_ARG_UNUSED,
enum mu_filter_command cmd,
struct mu_filter_io *iobuf)
{
size_t i, j;
const char *iptr = iobuf->input;
size_t isize = iobuf->isize;
char *optr = iobuf->output;
size_t osize = iobuf->osize;
switch (cmd)
{
case mu_filter_init:
case mu_filter_done:
return mu_filter_ok;
default:
break;
}
for (i = j = 0; i < isize && j < osize; i++)
{
unsigned char c = *(unsigned char*)iptr++;
if (c == '\r')
{
if (i + 1 == isize)
break;
if (*(unsigned char*)iptr == '\n')
continue;
}
optr[j++] = c;
}
iobuf->isize = i;
iobuf->osize = j;
return mu_filter_ok;
}
static struct _mu_filter_record _crlf_filter = {
"CRLF",
0,
NULL,
_crlf_encoder,
_crlf_decoder
};
mu_filter_record_t mu_crlf_filter = &_crlf_filter;
/* For compatibility with previous versions */
static struct _mu_filter_record _rfc822_filter = {
"RFC822",
0,
NULL,
_crlf_encoder,
_crlf_decoder
};
mu_filter_record_t mu_rfc822_filter = &_rfc822_filter;