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Diffstat (limited to 'epan/ptvcursor.c')
-rw-r--r-- | epan/ptvcursor.c | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/epan/ptvcursor.c b/epan/ptvcursor.c new file mode 100644 index 0000000000..cde56022f0 --- /dev/null +++ b/epan/ptvcursor.c @@ -0,0 +1,116 @@ +/* ptvcursor.c + * + * Proto Tree TVBuff cursor + * Gilbert Ramirez <gram@alumni.rice.edu> + * + * $Id$ + * + * Ethereal - Network traffic analyzer + * By Gerald Combs <gerald@zing.org> + * Copyright 2000 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. + */ + +#include "ptvcursor.h" + + +struct ptvcursor { + proto_tree *tree; + tvbuff_t *tvb; + gint offset; +}; + + +/* Allocates an initializes a ptvcursor_t with 3 variables: + * proto_tree, tvbuff, and offset. */ +ptvcursor_t* +ptvcursor_new(proto_tree *tree, tvbuff_t *tvb, gint offset) +{ + ptvcursor_t *ptvc; + + ptvc = g_new(ptvcursor_t, 1); + ptvc->tree = tree; + ptvc->tvb = tvb; + ptvc->offset = offset; + return ptvc; +} + + +/* Gets data from tvbuff, adds it to proto_tree, increments offset, + * and returns proto_item* */ +proto_item* +ptvcursor_add(ptvcursor_t *ptvc, int hf, gint length, gboolean endianness) +{ + proto_item *item; + + item = ptvcursor_add_no_advance(ptvc, hf, length, endianness); + ptvc->offset += proto_item_get_len(item); + return item; +} + +/* Gets data from tvbuff, adds it to proto_tree, *DOES NOT* increment + * offset, and returns proto_item* */ +proto_item* +ptvcursor_add_no_advance(ptvcursor_t* ptvc, int hf, gint length, + gboolean endianness) +{ + proto_item *item; + + item = proto_tree_add_item(ptvc->tree, hf, ptvc->tvb, ptvc->offset, + length, endianness); + + return item; +} + +/* Advance the ptvcursor's offset within its tvbuff without + * adding anything to the proto_tree. */ +void +ptvcursor_advance(ptvcursor_t* ptvc, gint length) +{ + ptvc->offset += length; +} + +/* Frees memory for ptvcursor_t, but nothing deeper than that. */ +void +ptvcursor_free(ptvcursor_t *ptvc) +{ + g_free(ptvc); +} +/* Returns tvbuff. */ +tvbuff_t* +ptvcursor_tvbuff(ptvcursor_t* ptvc) +{ + return ptvc->tvb; +} + +/* Returns current offset. */ +gint +ptvcursor_current_offset(ptvcursor_t* ptvc) +{ + return ptvc->offset; +} + +proto_tree* +ptvcursor_tree(ptvcursor_t* ptvc) +{ + return ptvc->tree; +} + +void +ptvcursor_set_tree(ptvcursor_t* ptvc, proto_tree *tree) +{ + ptvc->tree = tree; +} |