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

/*
 *  Copyright (C) 2000 Helix Code Inc.
 *
 *  Authors: Michael Zucchi <notzed@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-basic.h"

#include "camel-mime-utils.h"

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

static void camel_mime_filter_basic_class_init (CamelMimeFilterBasicClass *klass);
static void camel_mime_filter_basic_init       (CamelMimeFilterBasic *obj);

static CamelMimeFilterClass *camel_mime_filter_basic_parent;

static void
camel_mime_filter_basic_class_init (CamelMimeFilterBasicClass *klass)
{
    CamelMimeFilterClass *filter_class = (CamelMimeFilterClass *) klass;
    
    camel_mime_filter_basic_parent = CAMEL_MIME_FILTER_CLASS(camel_type_get_global_classfuncs (camel_mime_filter_get_type ()));

    filter_class->reset = reset;
    filter_class->filter = filter;
    filter_class->complete = complete;
}

static void
camel_mime_filter_basic_init (CamelMimeFilterBasic *obj)
{
    obj->state = 0;
    obj->save = 0;
}


CamelType
camel_mime_filter_basic_get_type (void)
{
    static CamelType type = CAMEL_INVALID_TYPE;
    
    if (type == CAMEL_INVALID_TYPE) {
        type = camel_type_register (camel_mime_filter_get_type (), "CamelMimeFilterBasic",
                        sizeof (CamelMimeFilterBasic),
                        sizeof (CamelMimeFilterBasicClass),
                        (CamelObjectClassInitFunc) camel_mime_filter_basic_class_init,
                        NULL,
                        (CamelObjectInitFunc) camel_mime_filter_basic_init,
                        NULL);
    }
    
    return type;
}

/* should this 'flush' outstanding state/data bytes? */
static void
reset(CamelMimeFilter *mf)
{
    CamelMimeFilterBasic *f = (CamelMimeFilterBasic *)mf;

    switch(f->type) {
    case CAMEL_MIME_FILTER_BASIC_QP_ENC:
        f->state = -1;
        break;
    default:
        f->state = 0;
    }
    f->save = 0;
}

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

    switch(f->type) {
    case CAMEL_MIME_FILTER_BASIC_BASE64_ENC:
        /* wont go to more than 2x size (overly conservative) */
        camel_mime_filter_set_size(mf, len*2+6, FALSE);
        newlen = base64_encode_close(in, len, TRUE, mf->outbuf, &f->state, &f->save);
        g_assert(newlen <= len*2+6);
        break;
    case CAMEL_MIME_FILTER_BASIC_QP_ENC:
        /* *4 is definetly more than needed ... */
        camel_mime_filter_set_size(mf, len*4+4, FALSE);
        newlen = quoted_encode_close(in, len, mf->outbuf, &f->state, &f->save);
        g_assert(newlen <= len*4+4);
        break;
    case CAMEL_MIME_FILTER_BASIC_BASE64_DEC:
        /* output can't possibly exceed the input size */
        camel_mime_filter_set_size(mf, len, FALSE);
        newlen = base64_decode_step(in, len, mf->outbuf, &f->state, &f->save);
        g_assert(newlen <= len);
        break;
    case CAMEL_MIME_FILTER_BASIC_QP_DEC:
        /* output can't possibly exceed the input size */
        camel_mime_filter_set_size(mf, len, FALSE);
        newlen = quoted_decode_step(in, len, mf->outbuf, &f->state, &f->save);
        g_assert(newlen <= len);
        break;
    default:
        g_warning("unknown type %d in CamelMimeFilterBasic", f->type);
        goto donothing;
    }

    *out = mf->outbuf;
    *outlen = newlen;
    *outprespace = mf->outpre;

    return;
donothing:
    *out = in;
    *outlen = len;
    *outprespace = prespace;
}

/* here we do all of the basic mime filtering */
static void
filter(CamelMimeFilter *mf, char *in, size_t len, size_t prespace, char **out, size_t *outlen, size_t *outprespace)
{
    CamelMimeFilterBasic *f = (CamelMimeFilterBasic *)mf;
    int newlen;

    switch(f->type) {
    case CAMEL_MIME_FILTER_BASIC_BASE64_ENC:
        /* wont go to more than 2x size (overly conservative) */
        camel_mime_filter_set_size(mf, len*2+6, FALSE);
        newlen = base64_encode_step(in, len, TRUE, mf->outbuf, &f->state, &f->save);
        g_assert(newlen <= len*2+6);
        break;
    case CAMEL_MIME_FILTER_BASIC_QP_ENC:
        /* *4 is overly conservative, but will do */
        camel_mime_filter_set_size(mf, len*4+4, FALSE);
        newlen = quoted_encode_step(in, len, mf->outbuf, &f->state, &f->save);
        g_assert(newlen <= len*4+4);
        break;
    case CAMEL_MIME_FILTER_BASIC_BASE64_DEC:
        /* output can't possibly exceed the input size */
        camel_mime_filter_set_size(mf, len, FALSE);
        newlen = base64_decode_step(in, len, mf->outbuf, &f->state, &f->save);
        g_assert(newlen <= len);
        break;
    case CAMEL_MIME_FILTER_BASIC_QP_DEC:
        /* output can't possibly exceed the input size */
        camel_mime_filter_set_size(mf, len, FALSE);
        newlen = quoted_decode_step(in, len, mf->outbuf, &f->state, &f->save);
        g_assert(newlen <= len);
        break;
    default:
        g_warning("unknown type %d in CamelMimeFilterBasic", f->type);
        goto donothing;
    }

    *out = mf->outbuf;
    *outlen = newlen;
    *outprespace = mf->outpre;

    return;
donothing:
    *out = in;
    *outlen = len;
    *outprespace = prespace;
}

/**
 * camel_mime_filter_basic_new:
 *
 * Create a new CamelMimeFilterBasic object.
 * 
 * Return value: A new CamelMimeFilterBasic widget.
 **/
CamelMimeFilterBasic *
camel_mime_filter_basic_new (void)
{
    CamelMimeFilterBasic *new = CAMEL_MIME_FILTER_BASIC ( camel_object_new (camel_mime_filter_basic_get_type ()));
    return new;
}

CamelMimeFilterBasic *
camel_mime_filter_basic_new_type(CamelMimeFilterBasicType type)
{
    CamelMimeFilterBasic *new;

    switch (type) {
    case CAMEL_MIME_FILTER_BASIC_BASE64_ENC:
    case CAMEL_MIME_FILTER_BASIC_QP_ENC:
    case CAMEL_MIME_FILTER_BASIC_BASE64_DEC:
    case CAMEL_MIME_FILTER_BASIC_QP_DEC:
        new = camel_mime_filter_basic_new();
        new->type = type;
        break;
    default:
        g_warning("Invalid type of CamelMimeFilterBasic requested: %d", type);
        new = NULL;
        break;
    }
    camel_mime_filter_reset((CamelMimeFilter *)new);
    return new;
}