path: root/camel/camel-mime-filter-crlf.c

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 *  Copyright (C) 2000 Helix Code, Inc.
 *
 *  Authors: Dan Winship <danw@helixcode.com>
 *           Jeffrey Stedfast <fejj@helixcode.com>
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Library General Public License
 *  as published by the Free Software Foundation; either version 2 of
 *  the License, or (at your option) any later version.
 *
 *  This program 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 Library General Public License for more details.
 *
 *  You should have received a copy of the GNU Library General Public
 *  License along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include "camel-mime-filter-crlf.h"

static void filter (CamelMimeFilter *f, char *in, size_t len, size_t prespace,
            char **out, size_t *outlen, size_t *outprespace);
static void complete (CamelMimeFilter *f, char *in, size_t len,
              size_t prespace, char **out, size_t *outlen,
              size_t *outprespace);
static void reset (CamelMimeFilter *f);


static void
camel_mime_filter_crlf_class_init (CamelMimeFilterCRLFClass *klass)
{
    CamelMimeFilterClass *mime_filter_class =
        (CamelMimeFilterClass *) klass;
    
    mime_filter_class->filter = filter;
    mime_filter_class->complete = complete;
    mime_filter_class->reset = reset;
}

CamelType
camel_mime_filter_crlf_get_type (void)
{
    static CamelType type = CAMEL_INVALID_TYPE;
    
    if (type == CAMEL_INVALID_TYPE) {
        type = camel_type_register (camel_mime_filter_get_type(), "CamelMimeFilterCRLF",
                        sizeof (CamelMimeFilterCRLF),
                        sizeof (CamelMimeFilterCRLFClass),
                        (CamelObjectClassInitFunc) camel_mime_filter_crlf_class_init,
                        NULL,
                        NULL,
                        NULL);
    }

    return type;
}

static void
filter (CamelMimeFilter *f, char *in, size_t len, size_t prespace,
    char **out, size_t *outlen, size_t *outprespace)
{
    CamelMimeFilterCRLF *crlf = (CamelMimeFilterCRLF *)f;
    gboolean do_dots;
    char *p, *q;

    do_dots = crlf->mode == CAMEL_MIME_FILTER_CRLF_MODE_CRLF_DOTS;

    if (crlf->direction == CAMEL_MIME_FILTER_CRLF_ENCODE) {
        camel_mime_filter_set_size (f, 3 * len, FALSE);

        p = in;
        q = f->outbuf;
        while (p < in + len) {
            if (*p == '\n')
                *q++ = '\r';
            else
                if (do_dots && *p == '.' && (p == in || *(p - 1) == '\n'))
                    *q++ = '.';
            *q++ = *p++;
        }
    } else {
        camel_mime_filter_set_size (f, len, FALSE);

        p = in;
        q = f->outbuf;
        while (p < in + len) {
            if (*p == '\r') {
                crlf->saw_cr = TRUE;
            } else {
                if (crlf->saw_cr) {
                    if (*p != '\n')
                        *q++ = '\r';
                    crlf->saw_cr = FALSE;
                }
                *q++ = *p;
            }

            if (do_dots) {
                if (*p == '.' && (p == in || *(p - 1) == '\n')) {
                    crlf->saw_dot = TRUE;
                } else {
                    if (crlf->saw_dot) {
                        if (*p == '.')
                            p++;
                        crlf->saw_dot = FALSE;
                    }
                    *q++ = *p;
                }
            }

            p++;
        }
    }

    *out = f->outbuf;
    *outlen = q - f->outbuf;
    *outprespace = f->outpre;
}

static void 
complete (CamelMimeFilter *f, char *in, size_t len, size_t prespace,
      char **out, size_t *outlen, size_t *outprespace)
{
    if (len)
        filter (f, in, len, prespace, out, outlen, outprespace);
}

static void
reset (CamelMimeFilter *f)
{
    CamelMimeFilterCRLF *crlf = (CamelMimeFilterCRLF *)f;

    crlf->saw_cr = FALSE;
}

CamelMimeFilter *
camel_mime_filter_crlf_new (CamelMimeFilterCRLFDirection direction, CamelMimeFilterCRLFMode mode)
{
    CamelMimeFilterCRLF *crlf = CAMEL_MIME_FILTER_CRLF(camel_object_new (CAMEL_MIME_FILTER_CRLF_TYPE));

    crlf->direction = direction;
    crlf->mode = mode;
    crlf->saw_cr = FALSE;

    return (CamelMimeFilter *)crlf;
}