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tvbparse.c

/* tvbparse.c
 *
 * Copyright 2005, Luis E. Garcia Ontanon <luis@ontanon.org>
 *
 * $Id: tvbparse.c 32366 2010-04-03 19:20:07Z wmeier $
 *
 * Wireshark - Network traffic analyzer
 * By Gerald Combs <gerald@wireshark.org>
 * Copyright 1998 Gerald Combs
 *
 * 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.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <stdlib.h>
#include <string.h>
#include <glib.h>

#include <epan/emem.h>
#include <epan/proto.h>
#include <epan/packet_info.h>
#include <epan/tvbparse.h>


#define TVBPARSE_DEBUG_ALL 0xffffffff

#if 0
#define TVBPARSE_DEBUG_ 0x80000000
#define TVBPARSE_DEBUG_ 0x40000000
#define TVBPARSE_DEBUG_ 0x20000000
#define TVBPARSE_DEBUG_ 0x10000000
#endif

#define TVBPARSE_DEBUG_CHAR 0x08000000
#define TVBPARSE_DEBUG_CHARS 0x04000000
#define TVBPARSE_DEBUG_NOT_CHAR 0x02000000
#define TVBPARSE_DEBUG_NOT_CHARS 0x01000000
#define TVBPARSE_DEBUG_STRING 0x00800000
#define TVBPARSE_DEBUG_CASESTRING 0x00400000
#define TVBPARSE_DEBUG_ONEOF 0x00200000
#define TVBPARSE_DEBUG_HASH 0x00100000
#define TVBPARSE_DEBUG_SEQ 0x00080000
#define TVBPARSE_DEBUG_SOME 0x00040000
#define TVBPARSE_DEBUG_UNTIL 0x00020000
#if 0
#define TVBPARSE_DEBUG_ 0x00010000
#define TVBPARSE_DEBUG_ 0x00008000
#define TVBPARSE_DEBUG_ 0x00004000
#define TVBPARSE_DEBUG_ 0x00002000
#define TVBPARSE_DEBUG_ 0x00001000
#endif
#define TVBPARSE_DEBUG_TT 0x00000800
#define TVBPARSE_DEBUG_CB 0x00000400
#define TVBPARSE_DEBUG_GET 0x00000200
#define TVBPARSE_DEBUG_FIND 0x00000100
#define TVBPARSE_DEBUG_NEWTOK 0x00000080
#define TVBPARSE_DEBUG_IGNORE 0x00000040
#define TVBPARSE_DEBUG_PEEK 0x00000020
#if 0
#define TVBPARSE_DEBUG_ 0x00000010
#define TVBPARSE_DEBUG_ 0x00000008
#define TVBPARSE_DEBUG_ 0x00000004
#define TVBPARSE_DEBUG_ 0x00000002
#define TVBPARSE_DEBUG_ 0x00000001
#endif

/*
#define TVBPARSE_DEBUG (TVBPARSE_DEBUG_SOME)
*/

static tvbparse_elem_t* new_tok(tvbparse_t* tt,
                                int id,
                                int offset,
                                int len,
                                const tvbparse_wanted_t* wanted) {
    tvbparse_elem_t* tok;

#ifdef TVBPARSE_DEBUG
    if (TVBPARSE_DEBUG & TVBPARSE_DEBUG_NEWTOK) g_warning("new_tok: id=%i offset=%u len=%u",id,offset,len);
#endif

    tok = ep_alloc(sizeof(tvbparse_elem_t));

    tok->tvb = tt->tvb;
    tok->id = id;
    tok->offset = offset;
    tok->len = len;
    tok->data = NULL;
    tok->sub = NULL;
    tok->next = NULL;
    tok->wanted = wanted;
    tok->last = tok;

    return tok;
}

static int ignore_fcn(tvbparse_t* tt, int offset) {
    int len = 0;
    int consumed;
    tvbparse_elem_t* ignored = NULL;

    if (!tt->ignore) return 0;

#ifdef TVBPARSE_DEBUG
    if (TVBPARSE_DEBUG & TVBPARSE_DEBUG_IGNORE) g_warning("ignore: enter");
#endif

    while ((consumed = tt->ignore->condition(tt,offset,tt->ignore,&ignored)) > 0) {
        len += consumed;
        offset += consumed;
#ifdef TVBPARSE_DEBUG
        if (TVBPARSE_DEBUG & TVBPARSE_DEBUG_IGNORE) g_warning("ignore: consumed=%i",consumed);
#endif

    }

#ifdef TVBPARSE_DEBUG
    if (TVBPARSE_DEBUG & TVBPARSE_DEBUG_IGNORE) g_warning("ignore: len=%i",len);
#endif

    return len;
}


static int cond_char (tvbparse_t* tt, const int offset, const tvbparse_wanted_t * wanted, tvbparse_elem_t** tok) {
    gchar c,t;
    guint i;

#ifdef TVBPARSE_DEBUG
    if (TVBPARSE_DEBUG & TVBPARSE_DEBUG_CHAR) g_warning("cond_char: control='%s'",wanted->control.str);
#endif

    if ( offset + 1 > tt->end_offset )
        return -1;

    t = (gchar) tvb_get_guint8(tt->tvb,offset);

    for(i = 0; (c = wanted->control.str[i]) && offset <= tt->end_offset; i++) {
        if ( c == t ) {
            *tok =  new_tok(tt,wanted->id,offset,1,wanted);
#ifdef TVBPARSE_DEBUG
            if (TVBPARSE_DEBUG & TVBPARSE_DEBUG_CHAR) g_warning("cond_char: GOT: '%c'",c);
#endif
            return 1;
        }
    }

    return -1;
}

tvbparse_wanted_t* tvbparse_char(const int id,
                                 const gchar* chr,
                                 const void* data,
                                 tvbparse_action_t before_cb,
                                 tvbparse_action_t after_cb) {
    tvbparse_wanted_t* w = g_malloc0(sizeof(tvbparse_wanted_t));

    w->condition = cond_char;
    w->id = id;
    w->control.str = chr;
    w->len = 1;
    w->data = data;
    w->before = before_cb;
    w->after = after_cb;

    return w;
}

static int cond_chars (tvbparse_t* tt, int offset, const tvbparse_wanted_t * wanted, tvbparse_elem_t** tok) {
    guint length = 0;
    int start = offset;
    int left = tt->end_offset - offset;

#ifdef TVBPARSE_DEBUG
    if (TVBPARSE_DEBUG & TVBPARSE_DEBUG_CHARS) g_warning("cond_chars: control='%s'",wanted->control.str);
#endif

    if ( offset + (int)wanted->min > tt->end_offset )
        return -1;

    left = left < (int) wanted->max ? left :  (int) wanted->max;

    while( left > 0 ) {
        gchar t = (gchar) tvb_get_guint8(tt->tvb,offset++);
        gchar c;
        guint i = 0;

        while ( (c = wanted->control.str[i++]) ) {
            if (c == t) goto next_char;
        }

        break;

next_char:
        length++;
        left--;
    };

    if (length < wanted->min) {
        return  -1;
    } else {
        *tok = new_tok(tt,wanted->id,start,length,wanted);
#ifdef TVBPARSE_DEBUG
        if (TVBPARSE_DEBUG & TVBPARSE_DEBUG_CHARS) g_warning("cond_chars: GOT len=%i",length);
#endif
        return length;
    }
}

tvbparse_wanted_t* tvbparse_chars(const int id,
                                  const guint min_len,
                                  const guint max_len,
                                  const gchar* chr,
                                  const void* data,
                                  tvbparse_action_t before_cb,
                                  tvbparse_action_t after_cb) {
    tvbparse_wanted_t* w = g_malloc0(sizeof(tvbparse_wanted_t));

    w->condition = cond_chars;
    w->id = id;
    w->control.str = chr;
    w->min = min_len ? min_len : 1;
    w->max = max_len ? max_len : G_MAXINT/2;
    w->data = data;
    w->before = before_cb;
    w->after = after_cb;

    return w;
}


static int cond_not_char(tvbparse_t* tt, const int offset, const tvbparse_wanted_t * wanted, tvbparse_elem_t** tok) {
    gchar c, t;
    guint i;
    gboolean not_matched = FALSE;

#ifdef TVBPARSE_DEBUG
    if (TVBPARSE_DEBUG & TVBPARSE_DEBUG_NOT_CHAR) g_warning("cond_not_char: control='%s'",wanted->control.str);
#endif

    if (! offset < tt->end_offset ) {
        return -1;
    }

    t = (gchar) tvb_get_guint8(tt->tvb,offset);

    for(i = 0; (c = wanted->control.str[i]); i++) {
        if ( c == t ) {
            not_matched = TRUE;
        }
    }

    if (not_matched) {
        return -1;
    } else {
        *tok =  new_tok(tt,wanted->id,offset,1,wanted);
#ifdef TVBPARSE_DEBUG
        if (TVBPARSE_DEBUG & TVBPARSE_DEBUG_NOT_CHAR) g_warning("cond_not_char: GOT='%c'",t);
#endif
        return 1;
    }
}

tvbparse_wanted_t* tvbparse_not_char(const int id,
                                     const gchar* chr,
                                     const void* data,
                                     tvbparse_action_t before_cb,
                                     tvbparse_action_t after_cb) {
    tvbparse_wanted_t* w = g_malloc0(sizeof(tvbparse_wanted_t));

    w->condition = cond_not_char;
    w->id = id;
    w->control.str = chr;
    w->data = data;
    w->before = before_cb;
    w->after = after_cb;

    return w;
}

static int cond_not_chars(tvbparse_t* tt, int offset, const tvbparse_wanted_t * wanted, tvbparse_elem_t** tok) {
    guint length = 0;
    int left = tt->end_offset - offset;
    int start = offset;

#ifdef TVBPARSE_DEBUG
    if (TVBPARSE_DEBUG & TVBPARSE_DEBUG_NOT_CHARS) g_warning("cond_not_chars: control='%s'",wanted->control.str);
#endif

    if ( offset + (int)wanted->min > tt->end_offset )
        return -1;

    if (left < (int)wanted->min)
        return -1;

    left = left <= (int)wanted->max ? left :  (int)wanted->max;

    while( left > 0 ) {
        gchar c;
        gchar t = (gchar) tvb_get_guint8(tt->tvb,offset);
        guint i = 0;

        while ( (c = wanted->control.str[i++]) ) {
            if (c == t) goto end_not_chars;
        }

        offset++;
        length++;
        left--;
    }
end_not_chars:

    if ( length < wanted->min ) {
        return -1;
    } else {
        *tok = new_tok(tt,wanted->id,start,length,wanted);
#ifdef TVBPARSE_DEBUG
        if (TVBPARSE_DEBUG & TVBPARSE_DEBUG_NOT_CHARS) g_warning("cond_not_chars: GOT len=%i",length);
#endif
        return length;
    }
}

tvbparse_wanted_t* tvbparse_not_chars(const int id,
                                      const guint min_len,
                                      const guint max_len,
                                      const gchar* chr,
                                      const void* data,
                                      tvbparse_action_t before_cb,
                                      tvbparse_action_t after_cb){
    tvbparse_wanted_t* w = g_malloc0(sizeof(tvbparse_wanted_t));

    w->condition = cond_not_chars;
    w->id = id;
    w->control.str = chr;
    w->len = 0;
    w->min = min_len ? min_len : 1;
    w->max = max_len ? max_len : G_MAXINT/2;
    w->data = data;
    w->before = before_cb;
    w->after = after_cb;

    return w;
}


static int cond_string(tvbparse_t* tt, const int offset, const tvbparse_wanted_t * wanted, tvbparse_elem_t** tok) {
    int len = wanted->len;
#ifdef TVBPARSE_DEBUG
    if (TVBPARSE_DEBUG & TVBPARSE_DEBUG_STRING) g_warning("cond_string: control='%s'",wanted->control.str);
#endif

    if ( offset + wanted->len > tt->end_offset )
        return -1;

    if ( tvb_strneql(tt->tvb, offset, wanted->control.str, len) == 0 ) {
        *tok = new_tok(tt,wanted->id,offset,len,wanted);
#ifdef TVBPARSE_DEBUG
        if (TVBPARSE_DEBUG & TVBPARSE_DEBUG_STRING) g_warning("cond_string: GOT len=%i",len);
#endif
        return len;
    } else {
        return -1;
    }
}

tvbparse_wanted_t* tvbparse_string(const int id,
                                   const gchar* str,
                                   const void* data,
                                   tvbparse_action_t before_cb,
                                   tvbparse_action_t after_cb) {
    tvbparse_wanted_t* w = g_malloc0(sizeof(tvbparse_wanted_t));

    w->condition = cond_string;
    w->id = id;
    w->control.str = str;
    w->len = (int) strlen(str);
    w->data = data;
    w->before = before_cb;
    w->after = after_cb;

    return w;
}

static int cond_casestring(tvbparse_t* tt, const int offset, const tvbparse_wanted_t * wanted, tvbparse_elem_t** tok) {
    int len = wanted->len;
#ifdef TVBPARSE_DEBUG
    if (TVBPARSE_DEBUG & TVBPARSE_DEBUG_CASESTRING) g_warning("cond_casestring: control='%s'",wanted->control.str);
#endif

    if ( offset + len > tt->end_offset )
        return -1;

    if ( tvb_strncaseeql(tt->tvb, offset, wanted->control.str, len) == 0 ) {
        *tok = new_tok(tt,wanted->id,offset,len,wanted);
#ifdef TVBPARSE_DEBUG
        if (TVBPARSE_DEBUG & TVBPARSE_DEBUG_CASESTRING) g_warning("cond_casestring: GOT len=%i",len);
#endif
        return len;
    } else {
        *tok = NULL;
        return -1;
    }
}

tvbparse_wanted_t* tvbparse_casestring(const int id,
                                       const gchar* str,
                                       const void* data,
                                       tvbparse_action_t before_cb,
                                       tvbparse_action_t after_cb) {
    tvbparse_wanted_t* w = g_malloc0(sizeof(tvbparse_wanted_t));

    w->condition = cond_casestring;
    w->id = id;
    w->control.str = str;
    w->len = (int) strlen(str);
    w->data = data;
    w->before = before_cb;
    w->after = after_cb;

    return w;
}

static int cond_one_of(tvbparse_t* tt, const int offset, const tvbparse_wanted_t * wanted, tvbparse_elem_t** tok) {
    guint i;
#ifdef TVBPARSE_DEBUG
    if (TVBPARSE_DEBUG & TVBPARSE_DEBUG_ONEOF) g_warning("cond_one_of: START");
#endif

    if ( offset > tt->end_offset )
        return -1;

    for(i=0; i < wanted->control.elems->len; i++) {
        tvbparse_wanted_t* w = g_ptr_array_index(wanted->control.elems,i);
        tvbparse_elem_t* new = NULL;
        int curr_len;

        if ( offset + w->len > tt->end_offset )
            return -1;

        curr_len = w->condition(tt, offset, w,  &new);

        if (curr_len >= 0) {
            *tok = new_tok(tt, wanted->id, new->offset, new->len, wanted);
            (*tok)->sub = new;
#ifdef TVBPARSE_DEBUG
            if (TVBPARSE_DEBUG & TVBPARSE_DEBUG_ONEOF) g_warning("cond_one_of: GOT len=%i",curr_len);
#endif
            return curr_len;
        }
    }

    return -1;
}

tvbparse_wanted_t* tvbparse_set_oneof(const int id,
                                      const void* data,
                                      tvbparse_action_t before_cb,
                                      tvbparse_action_t after_cb,
                                      ...) {
    tvbparse_wanted_t* w = g_malloc0(sizeof(tvbparse_wanted_t));
    tvbparse_t* el;
    va_list ap;

    w->condition = cond_one_of;
    w->id = id;
    w->data = data;
    w->before = before_cb;
    w->after = after_cb;
    w->control.elems = g_ptr_array_new();

    va_start(ap,after_cb);

    while(( el = va_arg(ap,tvbparse_t*) )) {
        g_ptr_array_add(w->control.elems,el);
    };

    va_end(ap);

    return w;
}

static int cond_hash(tvbparse_t* tt, const int offset, const tvbparse_wanted_t* wanted, tvbparse_elem_t** tok) {
    int key_len;
    gchar* key = NULL;
    tvbparse_elem_t* key_elem = NULL;
    tvbparse_wanted_t* value_wanted = NULL;
    int value_len;
    tvbparse_elem_t* value_elem = NULL;
    int tot_len;

#ifdef TVBPARSE_DEBUG
    if (TVBPARSE_DEBUG & TVBPARSE_DEBUG_HASH) g_warning("cond_hash: START");
#endif

    tvbparse_elem_t* ret_tok;
    if ( offset > tt->end_offset )
        return -1;

    key_len = wanted->control.hash.key->condition(tt, offset, wanted->control.hash.key,  &key_elem);

    if (key_len < 0)
        return -1;

    key = tvb_get_ephemeral_string(key_elem->tvb,key_elem->offset,key_elem->len);
#ifdef TVBPARSE_DEBUG
    if (TVBPARSE_DEBUG & TVBPARSE_DEBUG_HASH) g_warning("cond_hash: got key='%s'",key);
#endif

    if ((value_wanted = g_hash_table_lookup(wanted->control.hash.table,key))) {
        value_len = value_wanted->condition(tt, offset + key_len, value_wanted,  &value_elem);
    } else if (wanted->control.hash.other) {
        value_len = wanted->control.hash.other->condition(tt, offset+key_len, wanted->control.hash.other,  &value_elem);
        if (value_len < 0)
            return -1;
    } else {
        return -1;
    }

    tot_len = key_len + value_len;

    ret_tok = new_tok(tt, value_elem->id, offset, tot_len, wanted);
    ret_tok->sub = key_elem;
    ret_tok->sub->last->next = value_elem;

    *tok = ret_tok;
#ifdef TVBPARSE_DEBUG
    if (TVBPARSE_DEBUG & TVBPARSE_DEBUG_HASH) g_warning("cond_hash: GOT len=%i",tot_len);
#endif

    return tot_len;
}

tvbparse_wanted_t* tvbparse_hashed(const int id,
                                   const void* data,
                                   tvbparse_action_t before_cb,
                                   tvbparse_action_t after_cb,
                                   tvbparse_wanted_t* key,
                                   tvbparse_wanted_t* other,
                                   ...) {
    tvbparse_wanted_t* w = g_malloc0(sizeof(tvbparse_wanted_t));
    gchar* name;
    tvbparse_wanted_t* el;
    va_list ap;

    w->condition = cond_hash;
    w->id = id;
    w->data = data;
    w->before = before_cb;
    w->after = after_cb;
    w->control.hash.table = g_hash_table_new(g_str_hash,g_str_equal);
    w->control.hash.key = key;
    w->control.hash.other = other;

    va_start(ap,other);

    while(( name = va_arg(ap,gchar*) )) {
        el = va_arg(ap,tvbparse_wanted_t*);
        g_hash_table_insert(w->control.hash.table,name,el);
    }

    va_end(ap);

    return w;
}

void tvbparse_hashed_add(tvbparse_wanted_t* w, ...) {
    tvbparse_wanted_t* el;
    va_list ap;
    gchar* name;

    va_start(ap,w);

    while (( name = va_arg(ap,gchar*) )) {
        el = va_arg(ap,tvbparse_wanted_t*);
        g_hash_table_insert(w->control.hash.table,name,el);
    }

    va_end(ap);
}

static int cond_seq(tvbparse_t* tt, int offset, const tvbparse_wanted_t * wanted, tvbparse_elem_t** tok) {
    guint i;
    int len = 0;
    int start = offset;
    tvbparse_elem_t* ret_tok = NULL;

    if ( offset > tt->end_offset )
        return -1;
#ifdef TVBPARSE_DEBUG
    if (TVBPARSE_DEBUG & TVBPARSE_DEBUG_SEQ) g_warning("cond_seq: START");
#endif

    for(i=0; i < wanted->control.elems->len; i++) {
        tvbparse_wanted_t* w = g_ptr_array_index(wanted->control.elems,i);
        tvbparse_elem_t* new = NULL;

        if ( offset + w->len > tt->end_offset )
            return -1;


        len = w->condition(tt, offset, w, &new);

        if (len >= 0) {
            if (ret_tok) {
                ret_tok->len = (new->offset - ret_tok->offset) + new->len;
                ret_tok->sub->last->next = new;
                ret_tok->sub->last = new;
            } else {
                ret_tok = new_tok(tt, wanted->id, new->offset, new->len, wanted);
                ret_tok->sub = new;
                new->last = new;
            }
        } else {
            return -1;
        }

        offset += len;
        offset += ignore_fcn(tt,offset);
    }

    *tok = ret_tok;

#ifdef TVBPARSE_DEBUG
    if (TVBPARSE_DEBUG & TVBPARSE_DEBUG_SEQ) g_warning("cond_seq: GOT len=%i",offset - start);
#endif

    return offset - start;
}


tvbparse_wanted_t* tvbparse_set_seq(const int id,
                                    const void* data,
                                    tvbparse_action_t before_cb,
                                    tvbparse_action_t after_cb,
                                    ...) {
    tvbparse_wanted_t* w = g_malloc0(sizeof(tvbparse_wanted_t));
    tvbparse_wanted_t*  el = NULL;
    va_list ap;

    w->condition = cond_seq;
    w->id = id;
    w->data = data;
    w->before = before_cb;
    w->after = after_cb;
    w->control.elems = g_ptr_array_new();

    va_start(ap,after_cb);

    while(( el = va_arg(ap,tvbparse_wanted_t*) )) {
        g_ptr_array_add(w->control.elems,el);
    };

    va_end(ap);
    return w;
}

static int cond_some(tvbparse_t* tt, int offset, const tvbparse_wanted_t * wanted, tvbparse_elem_t** tok) {
    guint got_so_far = 0;
    int start = offset;
    tvbparse_elem_t* ret_tok = NULL;
#ifdef TVBPARSE_DEBUG
    if (TVBPARSE_DEBUG & TVBPARSE_DEBUG_SOME) g_warning("cond_some: START");
#endif

    if ( offset > tt->end_offset )
        return -1;

    if ( wanted->min == 0 ) {
        ret_tok = new_tok(tt,wanted->id,tt->offset,0,wanted);
    }

    while (got_so_far < wanted->max) {
        tvbparse_elem_t* new = NULL;
        int consumed;

        if ( offset > tt->end_offset )
            return -1;

        consumed = wanted->control.subelem->condition(tt, offset, wanted->control.subelem, &new);

        if(consumed >= 0) {
            if (ret_tok) {
                ret_tok->len = (new->offset - ret_tok->offset) + new->len;

                if (ret_tok->sub) {
                    ret_tok->sub->last->next = new;
                    ret_tok->sub->last = new;
                } else {
                    ret_tok->sub = new;
                }
            } else {
                ret_tok = new_tok(tt, wanted->id, new->offset, new->len, wanted);
                ret_tok->sub = new;
            }
        } else {
            break;
        }

        offset += consumed;
        got_so_far++;
    }

#ifdef TVBPARSE_DEBUG
    if (TVBPARSE_DEBUG & TVBPARSE_DEBUG_SOME) g_warning("cond_some: got num=%u",got_so_far);
#endif

    if(got_so_far < wanted->min) {
        return -1;
    }

    *tok = ret_tok;
#ifdef TVBPARSE_DEBUG
    if (TVBPARSE_DEBUG & TVBPARSE_DEBUG_SOME) g_warning("cond_some: GOT len=%i",offset - start);
#endif
    return offset - start;
}

tvbparse_wanted_t* tvbparse_some(const int id,
                                 const guint from,
                                 const guint to,
                                 const void* data,
                                 tvbparse_action_t before_cb,
                                 tvbparse_action_t after_cb,
                                 const tvbparse_wanted_t* el) {

    tvbparse_wanted_t* w = g_malloc0(sizeof(tvbparse_wanted_t));

    g_assert(from <= to);

    w->condition = cond_some;
    w->id = id;
    w->min = from;
    w->max = to;
    w->data = data;
    w->before = before_cb;
    w->after = after_cb;
    w->control.subelem = el;

    return w;
}


static int cond_until(tvbparse_t* tt, const int offset, const tvbparse_wanted_t * wanted, tvbparse_elem_t** tok) {
    tvbparse_elem_t* new = NULL;
    int len = 0;
    int target_offset = offset;
#ifdef TVBPARSE_DEBUG
    if (TVBPARSE_DEBUG & TVBPARSE_DEBUG_UNTIL) g_warning("cond_until: START");
#endif

    if ( offset + wanted->control.until.subelem->len > tt->end_offset )
        return -1;

    do {
        len = wanted->control.until.subelem->condition(tt, target_offset++, wanted->control.until.subelem,  &new);
    } while(len < 0  && target_offset+1 < tt->end_offset);

    if (len >= 0) {

        new->id = wanted->id;
        new->next = NULL;
        new->last = NULL;
        new->wanted = wanted;
        new->offset = offset;

        (*tok) = new;

        switch (wanted->control.until.mode) {
            case TP_UNTIL_INCLUDE:
                new->len = target_offset - offset - 1 + len;
#ifdef TVBPARSE_DEBUG
                if (TVBPARSE_DEBUG & TVBPARSE_DEBUG_UNTIL) g_warning("cond_until: GOT len=%i",target_offset - offset -1 + len);
#endif
                return target_offset - offset -1 + len;
            case TP_UNTIL_SPEND:
                new->len = target_offset - offset - 1;
#ifdef TVBPARSE_DEBUG
                if (TVBPARSE_DEBUG & TVBPARSE_DEBUG_UNTIL) g_warning("cond_until: GOT len=%i",target_offset - offset -1 + len);
#endif
                return target_offset - offset - 1 + len;
            case TP_UNTIL_LEAVE:
                new->len = target_offset - offset - 1;
#ifdef TVBPARSE_DEBUG
                if (TVBPARSE_DEBUG & TVBPARSE_DEBUG_UNTIL) g_warning("cond_until: GOT len=%i",target_offset - offset -1);
#endif
                return target_offset - offset -1;
            default:
                DISSECTOR_ASSERT_NOT_REACHED();
                return -1;
        }

    } else {
        return -1;
    }
}

tvbparse_wanted_t* tvbparse_until(const int id,
                                  const void* data,
                                  tvbparse_action_t before_cb,
                                  tvbparse_action_t after_cb,
                                  const tvbparse_wanted_t* el,
                                  until_mode_t until_mode) {
    tvbparse_wanted_t* w = g_malloc0(sizeof(tvbparse_wanted_t));

    w->condition = cond_until;
    w->control.until.mode = until_mode;
    w->control.until.subelem = el;
    w->id = id;
    w->data = data;
    w->before = before_cb;
    w->after = after_cb;

    return w;
}

static int cond_handle(tvbparse_t* tt, const int offset, const tvbparse_wanted_t * wanted, tvbparse_elem_t** tok) {
    tvbparse_wanted_t* w = *(wanted->control.handle);
    int len = w->condition(tt, offset, w,  tok);

    if (len >= 0) {
        return len;
    } else {
        return -1;
    }
}

tvbparse_wanted_t* tvbparse_handle(tvbparse_wanted_t** handle) {
    tvbparse_wanted_t* w = g_malloc0(sizeof(tvbparse_wanted_t));

    w->condition = cond_handle;
    w->control.handle = handle;

    return w;
}

static int cond_end(tvbparse_t* tt, const int offset, const tvbparse_wanted_t * wanted _U_, tvbparse_elem_t** tok) {
    if (offset == tt->end_offset) {
        *tok = new_tok(tt,wanted->id,offset,0,wanted);
        return 0;
    } else {
        return -1;
    }
}

tvbparse_wanted_t* tvbparse_end_of_buffer(const int id,
                                          const void* data,
                                          tvbparse_action_t before_cb,
                                          tvbparse_action_t after_cb) {
    tvbparse_wanted_t* w = g_malloc0(sizeof(tvbparse_wanted_t));

    w->id = id;
    w->condition = cond_end;
    w->after = after_cb;
    w->before = before_cb;
    w->data = data;
    return w;

}


#if 0
/* these extract binary values */

static int cond_ft(tvbparse_t* tt, int offset, const tvbparse_wanted_t * wanted, tvbparse_elem_t** tok) {
    guint len = 0;

    if ( offset + wanted->len > tt->end_offset )
        return -1;

    if (wanted->len) {
        return wanted->len;
    } else if (wanted->control.ftenum == FT_STRINGZ) {
        if (( len = tvb_find_guint8(tt->tvb,offset,tt->end_offset - offset,'\0') >= 0 )) {
            *tok = new_tok(tt,wanted->id,offset,len,wanted);
            return len;
        } else {
            return -1;
        }
    } else {
        return -2;
    }
}

gint ft_lens[] = {-1,-1,-1, 1, 2, 3, 4, 8, 1, 2, 3, 4, 8, 4, 8,-1,-1,-1, 0, -1, 6, -1, -1, 4, sizeof(struct e_in6_addr), -1, -1, -1, -1 };

tvbparse_wanted_t* tvbparse_ft(int id,
                               const void* data,
                               tvbparse_action_t before_cb,
                               tvbparse_action_t after_cb,
                               enum ftenum ftenum) {
    gint len = ft_lens[ftenum];

    if (len >= 0) {
        tvbparse_wanted_t* w = g_malloc0(sizeof(tvbparse_wanted_t));

        w->id = id;
        w->condition = cond_ft;
        w->len = len;
        w->control.ftenum = ftenum;
        w->after = after_cb;
        w->before = before_cb;
        w->data = data;

        return w;
    } else {
        g_assert(! "unsupported ftenum" );
        return NULL;
    }
}

static int cond_ft_comp(tvbparse_t* tt, int offset, const tvbparse_wanted_t * wanted _U_, tvbparse_elem_t** tok) {
    void* l = wanted->control.number.extract(tt->tvb,offset);
    const void* r = &(wanted->control.number.value);

    if ( offset + wanted->len > tt->end_offset )
        return -1;

    if ( wanted->control.number.comp(&l,&r) ) {
        *tok = new_tok(tt,wanted->id,offset,wanted->len,wanted);
        return wanted->len;
    } else {
        return -1;
    }
}

static gboolean comp_gt_i(void* lp, const void* rp) { return ( *((gint64*)lp) > *((gint64*)rp) ); }
static gboolean comp_ge_i(void* lp, const void* rp) { return ( *((gint64*)lp) >= *((gint64*)rp) ); }
static gboolean comp_eq_i(void* lp, const void* rp) { return ( *((gint64*)lp) == *((gint64*)rp) ); }
static gboolean comp_ne_i(void* lp, const void* rp) { return ( *((gint64*)lp) != *((gint64*)rp) ); }
static gboolean comp_le_i(void* lp, const void* rp) { return ( *((gint64*)lp) <= *((gint64*)rp) ); }
static gboolean comp_lt_i(void* lp, const void* rp) { return ( *((gint64*)lp) < *((gint64*)rp) ); }

static gboolean comp_gt_u(void* lp, const void* rp) { return ( *((guint64*)lp) > *((guint64*)rp) ); }
static gboolean comp_ge_u(void* lp, const void* rp) { return ( *((guint64*)lp) >= *((guint64*)rp) ); }
static gboolean comp_eq_u(void* lp, const void* rp) { return ( *((guint64*)lp) == *((guint64*)rp) ); }
static gboolean comp_ne_u(void* lp, const void* rp) { return ( *((guint64*)lp) != *((guint64*)rp) ); }
static gboolean comp_le_u(void* lp, const void* rp) { return ( *((guint64*)lp) <= *((guint64*)rp) ); }
static gboolean comp_lt_u(void* lp, const void* rp) { return ( *((guint64*)lp) < *((guint64*)rp) ); }

static gboolean comp_gt_f(void* lp, const void* rp) { return ( *((gdouble*)lp) > *((gdouble*)rp) ); }
static gboolean comp_ge_f(void* lp, const void* rp) { return ( *((gdouble*)lp) >= *((gdouble*)rp) ); }
static gboolean comp_eq_f(void* lp, const void* rp) { return ( *((gdouble*)lp) == *((gdouble*)rp) ); }
static gboolean comp_ne_f(void* lp, const void* rp) { return ( *((gdouble*)lp) != *((gdouble*)rp) ); }
static gboolean comp_le_f(void* lp, const void* rp) { return ( *((gdouble*)lp) <= *((gdouble*)rp) ); }
static gboolean comp_lt_f(void* lp, const void* rp) { return ( *((gdouble*)lp) < *((gdouble*)rp) ); }

static void* extract_u8(tvbuff_t* tvb, guint offset) {
    guint64* p = ep_new(guint64);
    *p = tvb_get_guint8(tvb,offset);
    return p;
}

static void* extract_uns(tvbuff_t* tvb, guint offset) {
    guint64* p = ep_new(guint64);
    *p = tvb_get_ntohs(tvb,offset);
    return p;
}

static void* extract_un24(tvbuff_t* tvb, guint offset) {
    guint64* p = ep_new(guint64);
    *p = tvb_get_ntoh24(tvb,offset);
    return p;
}

static void* extract_unl(tvbuff_t* tvb, guint offset) {
    guint64* p = ep_new(guint64);
    *p = tvb_get_ntohl(tvb,offset);
    return p;
}

static void* extract_un64(tvbuff_t* tvb, guint offset) {
    guint64* p = ep_new(guint64);
    *p = tvb_get_ntoh64(tvb,offset);
    return p;
}

static void* extract_ules(tvbuff_t* tvb, guint offset) {
    guint64* p = ep_new(guint64);
    *p = tvb_get_letohs(tvb,offset);
    return p;
}

static void* extract_ule24(tvbuff_t* tvb, guint offset) {
    guint64* p = ep_new(guint64);
    *p = tvb_get_letoh24(tvb,offset);
    return p;
}

static void* extract_ulel(tvbuff_t* tvb, guint offset) {
    guint64* p = ep_new(guint64);
    *p = tvb_get_letohl(tvb,offset);
    return p;
}

static void* extract_ule64(tvbuff_t* tvb, guint offset) {
    guint64* p = ep_new(guint64);
    *p = tvb_get_letoh64(tvb,offset);
    return p;
}

static void* extract_ins(tvbuff_t* tvb, guint offset) {
    guint64* p = ep_new(guint64);
    *p = tvb_get_ntohs(tvb,offset);
    return p;
}

static void* extract_in24(tvbuff_t* tvb, guint offset) {
    guint64* p = ep_new(guint64);
    *p = tvb_get_ntoh24(tvb,offset);
    return p;
}

static void* extract_inl(tvbuff_t* tvb, guint offset) {
    guint64* p = ep_new(guint64);
    *p = tvb_get_ntohl(tvb,offset);
    return p;
}

static void* extract_in64(tvbuff_t* tvb, guint offset) {
    guint64* p = ep_new(guint64);
    *p = tvb_get_ntoh64(tvb,offset);
    return p;
}

static void* extract_iles(tvbuff_t* tvb, guint offset) {
    guint64* p = ep_new(guint64);
    *p = tvb_get_letohs(tvb,offset);
    return p;
}

static void* extract_ile24(tvbuff_t* tvb, guint offset) {
    guint64* p = ep_new(guint64);
    *p = tvb_get_letoh24(tvb,offset);
    return p;
}

static void* extract_ilel(tvbuff_t* tvb, guint offset) {
    guint64* p = ep_new(guint64);
    *p = tvb_get_letohl(tvb,offset);
    return p;
}

static void* extract_ile64(tvbuff_t* tvb, guint offset) {
    guint64* p = ep_new(guint64);
    *p = tvb_get_letoh64(tvb,offset);
    return p;
}

static void* extract_inf(tvbuff_t* tvb, guint offset) {
    gdouble* p = ep_new(gdouble);
    *p = tvb_get_ntohieee_float(tvb,offset);
    return p;
}

static void* extract_ind(tvbuff_t* tvb, guint offset) {
    gdouble* p = ep_new(gdouble);
    *p = tvb_get_ntohieee_double(tvb,offset);
    return p;
}

static void* extract_ilef(tvbuff_t* tvb, guint offset) {
    gdouble* p = ep_new(gdouble);
    *p = tvb_get_letohieee_float(tvb,offset);
    return p;
}

static void* extract_iled(tvbuff_t* tvb, guint offset) {
    gdouble* p = ep_new(gdouble);
    *p = tvb_get_letohieee_double(tvb,offset);
    return p;
}



static gboolean (*comps_u[])(void*, const void*) = {comp_gt_u,comp_ge_u,comp_eq_u,comp_ne_u,comp_le_u,comp_lt_u};
static gboolean (*comps_i[])(void*, const void*) = {comp_gt_i,comp_ge_i,comp_eq_i,comp_ne_i,comp_le_i,comp_lt_i};
static gboolean (*comps_f[])(void*, const void*) = {comp_gt_f,comp_ge_f,comp_eq_f,comp_ne_f,comp_le_f,comp_lt_f};

static gboolean (**comps[])(void*, const void*) = {comps_u,comps_i,comps_f};

static void* (*extract_n[])(tvbuff_t* tvb, guint offset)  =  {    NULL, NULL, NULL, extract_u8, extract_uns, extract_un24, extract_unl, extract_un64, extract_u8, extract_ins, extract_in24, extract_inl, extract_in64, extract_inf, extract_ind, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,NULL, NULL };
static void* (*extract_le[])(tvbuff_t* tvb, guint offset)  =  {   NULL, NULL, NULL, extract_u8, extract_ules, extract_ule24, extract_ulel, extract_ule64, extract_u8, extract_iles, extract_ile24, extract_ilel, extract_ile64, extract_ilef, extract_iled, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL,NULL, NULL };

static void* (**extracts[])(tvbuff_t* tvb, guint offset) = { extract_n, extract_le};


tvbparse_wanted_t* tvbparse_ft_numcmp(int id,
                                      const void* data,
                                      tvbparse_action_t before_cb,
                                      tvbparse_action_t after_cb,
                                      enum ftenum ftenum,
                                      int little_endian,
                                      enum ft_cmp_op ft_cmp_op,
                                      ... ) {
    tvbparse_wanted_t* w = g_malloc0(sizeof(tvbparse_wanted_t));
    va_list ap;

    va_start(ap,ft_cmp_op);

    switch (ftenum) {
        case FT_UINT8:
        case FT_UINT16:
        case FT_UINT24:
        case FT_UINT32:
            w->control.number.comp = comps[0][ft_cmp_op];
            w->control.number.value.u = va_arg(ap,guint32);
            break;
        case FT_UINT64:
            w->control.number.comp = comps[0][ft_cmp_op];
            w->control.number.value.u = va_arg(ap,guint64);
            break;
        case FT_INT8:
        case FT_INT16:
        case FT_INT24:
        case FT_INT32:
            w->control.number.comp = comps[1][ft_cmp_op];
            w->control.number.value.i = va_arg(ap,gint32);
            break;
        case FT_INT64:
            w->control.number.comp = comps[1][ft_cmp_op];
            w->control.number.value.i = va_arg(ap,gint64);
            break;
        case FT_FLOAT:
        case FT_DOUBLE:
            w->control.number.comp = comps[1][ft_cmp_op];
            w->control.number.value.i = va_arg(ap,gdouble);
            break;
        default:
            g_assert(! "comparison unsupported");
    }

    w->control.number.extract = extracts[little_endian][ftenum];

    g_assert(w->control.number.extract && "extraction unsupported");

    w->id = id;
    w->condition = cond_ft_comp;
    w->after = after_cb;
    w->before = before_cb;
    w->data = data;

    return w;
}

#endif


tvbparse_wanted_t* tvbparse_quoted(const int id,
                                   const void* data,
                                   tvbparse_action_t before_cb,
                                   tvbparse_action_t after_cb,
                                   const char quote,
                                   const char esc) {

    gchar* esc_quot = g_strdup_printf("%c%c",esc,quote);
    gchar* quot = g_strdup_printf("%c",quote);
    tvbparse_wanted_t* want_quot = tvbparse_char(-1,quot,NULL,NULL,NULL);

    return tvbparse_set_oneof(id, data, before_cb, after_cb,
                              tvbparse_set_seq(-1, NULL, NULL, NULL,
                                               want_quot,
                                               tvbparse_set_seq(-1,NULL,NULL,NULL,
                                                                tvbparse_set_oneof(-1, NULL, NULL, NULL,
                                                                                   tvbparse_string(-1,esc_quot,NULL,NULL,NULL),
                                                                                   tvbparse_not_chars(-1,0,0,quot,NULL,NULL,NULL),
                                                                                   NULL),
                                                                NULL),
                                               want_quot,
                                               NULL),
                              tvbparse_set_seq(-1, NULL, NULL, NULL,
                                               want_quot,
                                               want_quot,
                                               NULL),
                              NULL);
}

void tvbparse_shrink_token_cb(void* tvbparse_data _U_,
                              const void* wanted_data _U_,
                              tvbparse_elem_t* tok) {
    tok->offset += 1;
    tok->len -= 2;
}

tvbparse_t* tvbparse_init(tvbuff_t* tvb,
                          const int offset,
                          int len,
                          void* data,
                          const tvbparse_wanted_t* ignore) {
    tvbparse_t* tt = ep_alloc(sizeof(tvbparse_t));

#ifdef TVBPARSE_DEBUG
    if (TVBPARSE_DEBUG & TVBPARSE_DEBUG_TT) g_warning("tvbparse_init: offset=%i len=%i",offset,len);
#endif


    tt->tvb = tvb;
    tt->offset = offset;
    len = (len == -1) ? (int) tvb_length(tvb) : len;
    tt->end_offset = offset + len;
    tt->data = data;
    tt->ignore = ignore;
    return tt;
}

gboolean tvbparse_reset(tvbparse_t* tt,
                        const int offset,
                        int len) {

#ifdef TVBPARSE_DEBUG
    if (TVBPARSE_DEBUG & TVBPARSE_DEBUG_TT) g_warning("tvbparse_init: offset=%i len=%i",offset,len);
#endif

    len = (len == -1) ? (int) tvb_length(tt->tvb) : len;

    if( tvb_length_remaining(tt->tvb, offset) >= len) {
        tt->offset = offset;
        tt->end_offset = offset + len;
        return TRUE;
    } else {
        return FALSE;
    }
}

guint tvbparse_curr_offset(tvbparse_t* tt) {
    return tt->offset;
}

static void execute_callbacks(tvbparse_t* tt, tvbparse_elem_t* curr) {
    ep_stack_t stack = ep_stack_new();

    while (curr) {
        if(curr->wanted->before) {
#ifdef TVBPARSE_DEBUG
            if (TVBPARSE_DEBUG & TVBPARSE_DEBUG_CB) g_warning("execute_callbacks: BEFORE: id=%i offset=%i len=%i",curr->id,curr->offset,curr->len);
#endif
            curr->wanted->before(tt->data, curr->wanted->data, curr);
        }

        if(curr->sub) {
            ep_stack_push(stack,curr);
            curr = curr->sub;
            continue;
        } else {
#ifdef TVBPARSE_DEBUG
            if (TVBPARSE_DEBUG & TVBPARSE_DEBUG_CB) g_warning("execute_callbacks: AFTER: id=%i offset=%i len=%i",curr->id,curr->offset,curr->len);
#endif
            if(curr->wanted->after) curr->wanted->after(tt->data, curr->wanted->data, curr);
        }

        curr = curr->next;

        while( !curr && ep_stack_peek(stack) ) {
            curr = ep_stack_pop(stack);
#ifdef TVBPARSE_DEBUG
            if (TVBPARSE_DEBUG & TVBPARSE_DEBUG_CB) g_warning("execute_callbacks: AFTER: id=%i offset=%i len=%i",curr->id,curr->offset,curr->len);
#endif
            if( curr->wanted->after ) curr->wanted->after(tt->data, curr->wanted->data, curr);
            curr = curr->next;
        }
    }

}

gboolean tvbparse_peek(tvbparse_t* tt,
                       const tvbparse_wanted_t* wanted) {
    tvbparse_elem_t* tok = NULL;
    int consumed;
    int offset = tt->offset;

#ifdef TVBPARSE_DEBUG
    if (TVBPARSE_DEBUG & TVBPARSE_DEBUG_PEEK) g_warning("tvbparse_peek: ENTER offset=%i",offset);
#endif

    offset += ignore_fcn(tt,offset);

#ifdef TVBPARSE_DEBUG
    if (TVBPARSE_DEBUG & TVBPARSE_DEBUG_PEEK) g_warning("tvbparse_peek: after ignore offset=%i",offset);
#endif

    consumed = wanted->condition(tt,offset,wanted,&tok);

    if (consumed >= 0) {
#ifdef TVBPARSE_DEBUG
        if (TVBPARSE_DEBUG & TVBPARSE_DEBUG_PEEK) g_warning("tvbparse_peek: GOT len=%i",consumed);
#endif
        return TRUE;
    } else {
#ifdef TVBPARSE_DEBUG
        if (TVBPARSE_DEBUG & TVBPARSE_DEBUG_PEEK) g_warning("tvbparse_peek: NOT GOT");
#endif
        return FALSE;
    }

}

tvbparse_elem_t* tvbparse_get(tvbparse_t* tt,
                              const tvbparse_wanted_t* wanted) {
    tvbparse_elem_t* tok = NULL;
    int consumed;
    int offset = tt->offset;

#ifdef TVBPARSE_DEBUG
    if (TVBPARSE_DEBUG & TVBPARSE_DEBUG_GET) g_warning("tvbparse_get: ENTER offset=%i",offset);
#endif

    offset += ignore_fcn(tt,offset);

#ifdef TVBPARSE_DEBUG
    if (TVBPARSE_DEBUG & TVBPARSE_DEBUG_GET) g_warning("tvbparse_get: after ignore offset=%i",offset);
#endif

    consumed = wanted->condition(tt,offset,wanted,&tok);

    if (consumed >= 0) {
#ifdef TVBPARSE_DEBUG
        if (TVBPARSE_DEBUG & TVBPARSE_DEBUG_GET) g_warning("tvbparse_get: GOT len=%i",consumed);
#endif
        execute_callbacks(tt,tok);
        tt->offset = offset + consumed;
#ifdef TVBPARSE_DEBUG
        if (TVBPARSE_DEBUG & TVBPARSE_DEBUG_GET) g_warning("tvbparse_get: DONE offset=%i", tt->offset);
#endif
        return tok;
    } else {
        return NULL;
    }

}


tvbparse_elem_t* tvbparse_find(tvbparse_t* tt, const tvbparse_wanted_t* wanted) {
    tvbparse_elem_t* tok = NULL;
    int len = 0;
    int offset = tt->offset;
    int target_offset = offset -1;

#ifdef TVBPARSE_DEBUG
    if (TVBPARSE_DEBUG & TVBPARSE_DEBUG_FIND) g_warning("tvbparse_get: ENTER offset=%i", tt->offset);
#endif

    do {
        len = wanted->condition(tt, target_offset+1, wanted,  &tok);
    } while(len < 0  && ++target_offset < tt->end_offset);

    if (len >= 0) {
#ifdef TVBPARSE_DEBUG
        if (TVBPARSE_DEBUG & TVBPARSE_DEBUG_FIND) g_warning("tvbparse_get: FOUND offset=%i len=%i", target_offset,len);
#endif
        execute_callbacks(tt,tok);
        tt->offset = target_offset + len;

#ifdef TVBPARSE_DEBUG
        if (TVBPARSE_DEBUG & TVBPARSE_DEBUG_FIND) g_warning("tvbparse_get: DONE offset=%i", tt->offset);
#endif
        return tok;
    } else {
#ifdef TVBPARSE_DEBUG
        if (TVBPARSE_DEBUG & TVBPARSE_DEBUG_FIND) g_warning("tvbparse_get: NOT FOUND");
#endif
        return NULL;
    }
}

struct _elem_tree_stack_frame {
    proto_tree* tree;
    tvbparse_elem_t* elem;
};

void tvbparse_tree_add_elem(proto_tree* tree, tvbparse_elem_t* curr) {
    ep_stack_t stack = ep_stack_new();
    struct _elem_tree_stack_frame* frame = ep_alloc(sizeof(struct _elem_tree_stack_frame));
    proto_item* pi;
    frame->tree = tree;
    frame->elem = curr;

    while (curr) {
        pi = proto_tree_add_text(frame->tree,curr->tvb,curr->offset,curr->len,"%s",tvb_format_text(curr->tvb,curr->offset,curr->len));

        if(curr->sub) {
            frame->elem = curr;
            ep_stack_push(stack,frame);
            frame = ep_alloc(sizeof(struct _elem_tree_stack_frame));
            frame->tree = proto_item_add_subtree(pi,0);
            curr = curr->sub;
            continue;
        }

        curr = curr->next;

        while( !curr && ep_stack_peek(stack) ) {
            frame = ep_stack_pop(stack);
            curr = frame->elem->next;
        }

    }
}


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