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

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*- */
/*
 *  Copyright (C) 2000 Helix Code Inc.
 *
 *  Authors: Jeffrey Stedfast <fejj@helixcode.com>
 *
 *  This program 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 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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 *  USA
 */

#include "camel-mime-filter-smtp.h"
#include <string.h>

#include <stdio.h>

#define d(x)

struct _CamelMimeFilterSmtpPrivate {
};

#define _PRIVATE(o) (((CamelMimeFilterSmtp *)(o))->priv)

static void camel_mime_filter_smtp_class_init (CamelMimeFilterSmtpClass *klass);
static void camel_mime_filter_smtp_init       (CamelMimeFilterSmtp *obj);
static void camel_mime_filter_smtp_finalise   (GtkObject *obj);

static CamelMimeFilterClass *camel_mime_filter_smtp_parent;

enum SIGNALS {
    LAST_SIGNAL
};

static guint signals[LAST_SIGNAL] = { 0 };

guint
camel_mime_filter_smtp_get_type (void)
{
    static guint type = 0;
    
    if (!type) {
        GtkTypeInfo type_info = {
            "CamelMimeFilterSmtp",
            sizeof (CamelMimeFilterSmtp),
            sizeof (CamelMimeFilterSmtpClass),
            (GtkClassInitFunc) camel_mime_filter_smtp_class_init,
            (GtkObjectInitFunc) camel_mime_filter_smtp_init,
            (GtkArgSetFunc) NULL,
            (GtkArgGetFunc) NULL
        };
        
        type = gtk_type_unique (camel_mime_filter_get_type (), &type_info);
    }
    
    return type;
}

typedef enum { EOLN_NODE, DOT_NODE } node_t;

struct smtpnode {
    struct smtpnode *next;
    node_t type;
    char *pointer;
};

static void
complete(CamelMimeFilter *mf, char *in, size_t len, size_t prespace, char **out, size_t *outlen, size_t *outprespace)
{
    *out = in;
    *outlen = len;
    *outprespace = prespace;
}


/* Yes, it is complicated ... */
static void
filter(CamelMimeFilter *mf, char *in, size_t len, size_t prespace, char **out, size_t *outlen, size_t *outprespace)
{
    CamelMimeFilterSmtp *f = (CamelMimeFilterSmtp *)mf;
    register gchar *inptr, *inend;
    guint linecount = 0;
    guint dotcount = 0;
    gint left;
    gint midline = f->midline;
    struct smtpnode *head = NULL, *tail = (struct smtpnode *)&head, *node;
    gchar *outptr = NULL;

    inptr = in;
    inend = inptr + len;

    while (inptr < inend) {
        register gint c = -1;

        if (midline)
            while (inptr < inend && (c = *inptr++) != '\n')
                ;

        if (c == '\n' || !midline) {
            /* if there isn't already a carriage-return before the line-feed, count it */
            if (*(inptr-1) == '\n' && *(inptr-2) != '\r') {
                linecount++;
                node = alloca(sizeof(*node));
                node->type = EOLN_NODE;
                node->pointer = inptr - 1;
                node->next = NULL;
                tail->next = node;
                tail = node;
            }

            left = inend - inptr;
                if (left < 2) {
                if (*inptr == '.') {
                    camel_mime_filter_backup(mf, inptr, left);
                    midline = FALSE;
                    inend = inptr;
                    break;
                }
            } else {
                /* we only need to escape dots if they start the line */
                if (left > 0 && *inptr == '.' && *(inptr+1) != '.') {
                    midline = TRUE;
                    dotcount++;
                    node = alloca(sizeof(*node));
                    node->type = DOT_NODE;
                    node->pointer = inptr;
                    node->next = NULL;
                    tail->next = node;
                    tail = node;
                    inptr++;
                } else {
                    midline = TRUE;
                }
            }
        } else {
            /* \n is at end of line, check next buffer */
            midline = FALSE;
        }
    }

    f->midline = midline;

    if (dotcount > 0 || linecount > 0) {
        camel_mime_filter_set_size(mf, len + dotcount + linecount, FALSE);
        node = head;
        inptr = in;
        outptr = mf->outbuf;
        while (node) {
            if (node->type == EOLN_NODE) {
                memcpy(outptr, inptr, node->pointer - inptr);
                outptr += node->pointer - inptr;
                *outptr++ = '\r';
            } else {
                if (node->type == DOT_NODE) {
                    memcpy(outptr, inptr, node->pointer - inptr);
                    outptr += node->pointer - inptr;
                    *outptr++ = '.';
                }
            }
            inptr = node->pointer;
            node = node->next;
        }
        memcpy(outptr, inptr, inend - inptr);
        outptr += inend - inptr;
        *out = mf->outbuf;
        *outlen = outptr - mf->outbuf;
        *outprespace = mf->outbuf - mf->outreal;

        d(printf("Filtered '%.*s'\n", *outlen, *out));
    } else {
        *out = in;
        *outlen = inend - in;
        *outprespace = prespace;
        
        d(printf("Filtered '%.*s'\n", *outlen, *out));
    }
}

static void
camel_mime_filter_smtp_class_init (CamelMimeFilterSmtpClass *klass)
{
    GtkObjectClass *object_class = (GtkObjectClass *) klass;
    CamelMimeFilterClass *filter_class = (CamelMimeFilterClass *) klass;
    
    camel_mime_filter_smtp_parent = gtk_type_class (camel_mime_filter_get_type ());

    object_class->finalize = camel_mime_filter_smtp_finalise;

    filter_class->filter = filter;
    filter_class->complete = complete;

    gtk_object_class_add_signals (object_class, signals, LAST_SIGNAL);
}

static void
camel_mime_filter_smtp_init (CamelMimeFilterSmtp *obj)
{
    struct _CamelMimeFilterSmtpPrivate *p;

    p = _PRIVATE(obj) = g_malloc0(sizeof(*p));
    obj->midline = FALSE;
}

static void
camel_mime_filter_smtp_finalise (GtkObject *obj)
{
    ((GtkObjectClass *)(camel_mime_filter_smtp_parent))->finalize((GtkObject *)obj);
}

/**
 * camel_mime_filter_smtp_new:
 *
 * Create a new CamelMimeFilterSmtp object.
 * 
 * Return value: A new CamelMimeFilterSmtp widget.
 **/
CamelMimeFilterSmtp *
camel_mime_filter_smtp_new (void)
{
    CamelMimeFilterSmtp *new = CAMEL_MIME_FILTER_SMTP (gtk_type_new (camel_mime_filter_smtp_get_type ()));
    return new;
}

#ifdef TEST_PROGRAM

#include <stdio.h>

int main(int argc, char **argv)
{
    CamelMimeFilterSmtp *f;
    char *buffer;
    int len, prespace;

    gtk_init(&argc, &argv);

    f = camel_mime_filter_smtp_new();

    buffer = "This is a test\nFrom Someone\nTo someone. From Someone else, From\n From blah\nFromblah\nBye! \nFrom \n.\n.\r\nprevious 2 lines had .'s\nfrom should also be escaped\n";
    len = strlen(buffer);
    prespace = 0;

    printf("input = '%.*s'\n", len, buffer);
    camel_mime_filter_filter(f, buffer, len, prespace, &buffer, &len, &prespace);
    printf("output = '%.*s'\n", len, buffer);
    buffer = "";
    len = 0;
    prespace = 0;
    camel_mime_filter_complete(f, buffer, len, prespace, &buffer, &len, &prespace);
    printf("complete = '%.*s'\n", len, buffer);
    

    return 0;
}

#endif