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

/*
 *  Copyright (C) 2000 Helix Code, Inc.
 *
 *  Authors: Dan Winship <danw@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;
}

GtkType
camel_mime_filter_crlf_get_type (void)
{
    static GtkType type = 0;
    
    if (!type) {
        GtkTypeInfo type_info = {
            "CamelMimeFilterCRLF",
            sizeof (CamelMimeFilterCRLF),
            sizeof (CamelMimeFilterCRLFClass),
            (GtkClassInitFunc) camel_mime_filter_crlf_class_init,
            (GtkObjectInitFunc) NULL,
                /* reserved_1 */ NULL,
                /* reserved_2 */ NULL,
            (GtkClassInitFunc) NULL
        };
        
        type = gtk_type_unique (camel_mime_filter_get_type (),
                    &type_info);
    }

    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;
    char *p, *q;

    if (crlf->direction == CAMEL_MIME_FILTER_CRLF_ENCODE) {
        camel_mime_filter_set_size (f, 2 * len, FALSE);

        p = in;
        q = f->outbuf;
        while (p < in + len) {
            if (*p == '\n')
                *q++ = '\r';
            *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++;
            }
        }
    }

    *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)
{
    CamelMimeFilterCRLF *crlf = gtk_type_new (CAMEL_MIME_FILTER_CRLF_TYPE);

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

    return (CamelMimeFilter *)crlf;
}