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Diffstat (limited to 'epan/dissectors/packet-ieee80211-radiotap-iter.h')
| -rw-r--r-- | epan/dissectors/packet-ieee80211-radiotap-iter.h | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/epan/dissectors/packet-ieee80211-radiotap-iter.h b/epan/dissectors/packet-ieee80211-radiotap-iter.h new file mode 100644 index 0000000000..34231fa7fb --- /dev/null +++ b/epan/dissectors/packet-ieee80211-radiotap-iter.h @@ -0,0 +1,116 @@ +/* + * Radiotap parser + * + * Copyright 2007 Andy Green <andy@warmcat.com> + * Copyright 2009 Johannes Berg <johannes@sipsolutions.net> + * + * $Id$ + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * Alternatively, this software may be distributed under the terms of BSD + * license. + * + * See COPYING for more details. + */ + +#ifndef __RADIOTAP_ITER_H +#define __RADIOTAP_ITER_H + +#define RADIOTAP_SUPPORT_OVERRIDES + +#include <glib.h> +#include "packet-ieee80211-radiotap-defs.h" + +/* Radiotap header iteration + * implemented in radiotap.c + */ + +struct radiotap_override { + guint8 field; + guint align:4, size:4; +}; + +struct radiotap_align_size { + guint align:4, size:4; +}; + +struct ieee80211_radiotap_namespace { + const struct radiotap_align_size *align_size; + int n_bits; + guint32 oui; + guint8 subns; +}; + +struct ieee80211_radiotap_vendor_namespaces { + const struct ieee80211_radiotap_namespace *ns; + int n_ns; +}; + +/** + * struct ieee80211_radiotap_iterator - tracks walk thru present radiotap args + * @this_arg_index: index of current arg, valid after each successful call + * to ieee80211_radiotap_iterator_next() + * @this_arg: pointer to current radiotap arg; it is valid after each + * call to ieee80211_radiotap_iterator_next() but also after + * ieee80211_radiotap_iterator_init() where it will point to + * the beginning of the actual data portion + * @this_arg_size: length of the current arg, for convenience + * @current_namespace: pointer to the current namespace definition + * (or internally %NULL if the current namespace is unknown) + * @is_radiotap_ns: indicates whether the current namespace is the default + * radiotap namespace or not + * + * @overrides: override standard radiotap fields + * @n_overrides: number of overrides + * + * @_rtheader: pointer to the radiotap header we are walking through + * @_max_length: length of radiotap header in cpu byte ordering + * @_arg_index: next argument index + * @_arg: next argument pointer + * @_next_bitmap: internal pointer to next present u32 + * @_bitmap_shifter: internal shifter for curr u32 bitmap, b0 set == arg present + * @_vns: vendor namespace definitions + * @_next_ns_data: beginning of the next namespace's data + * @_reset_on_ext: internal; reset the arg index to 0 when going to the + * next bitmap word + * + * Describes the radiotap parser state. Fields prefixed with an underscore + * must not be used by users of the parser, only by the parser internally. + */ + +struct ieee80211_radiotap_iterator { + struct ieee80211_radiotap_header *_rtheader; + const struct ieee80211_radiotap_vendor_namespaces *_vns; + const struct ieee80211_radiotap_namespace *current_namespace; + + unsigned char *_arg, *_next_ns_data; + guint32 *_next_bitmap; + + unsigned char *this_arg; +#ifdef RADIOTAP_SUPPORT_OVERRIDES + const struct radiotap_override *overrides; + int n_overrides; +#endif + int this_arg_index; + int this_arg_size; + + int is_radiotap_ns; + + int _max_length; + int _arg_index; + guint32 _bitmap_shifter; + int _reset_on_ext; +}; + +extern int ieee80211_radiotap_iterator_init( + struct ieee80211_radiotap_iterator *iterator, + struct ieee80211_radiotap_header *radiotap_header, + int max_length, const struct ieee80211_radiotap_vendor_namespaces *vns); + +extern int ieee80211_radiotap_iterator_next( + struct ieee80211_radiotap_iterator *iterator); + +#endif /* __RADIOTAP_ITER_H */ |