2 * Common routines for ASN.1
7 * Wireshark - Network traffic analyzer
8 * By Gerald Combs <gerald@wireshark.org>
9 * Copyright 1998 Gerald Combs
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License
13 * as published by the Free Software Foundation; either version 2
14 * of the License, or (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
34 #include <epan/emem.h>
35 #include <epan/packet.h>
39 void asn1_ctx_init(asn1_ctx_t *actx, asn1_enc_e encoding, gboolean aligned, packet_info *pinfo) {
40 memset(actx, '\0', sizeof(*actx));
41 actx->signature = ASN1_CTX_SIGNATURE;
42 actx->encoding = encoding;
43 actx->aligned = aligned;
47 gboolean asn1_ctx_check_signature(asn1_ctx_t *actx) {
48 return actx && (actx->signature == ASN1_CTX_SIGNATURE);
51 void asn1_ctx_clean_external(asn1_ctx_t *actx) {
52 memset(&actx->external, '\0', sizeof(actx->external));
53 actx->external.hf_index = -1;
54 actx->external.encoding = -1;
57 void asn1_ctx_clean_epdv(asn1_ctx_t *actx) {
58 memset(&actx->embedded_pdv, '\0', sizeof(actx->embedded_pdv));
59 actx->embedded_pdv.hf_index = -1;
60 actx->embedded_pdv.identification = -1;
64 /*--- stack/parameters ---*/
66 void asn1_stack_frame_push(asn1_ctx_t *actx, const gchar *name) {
67 asn1_stack_frame_t *frame;
69 frame = ep_new0(asn1_stack_frame_t);
71 frame->next = actx->stack;
75 void asn1_stack_frame_pop(asn1_ctx_t *actx, const gchar *name) {
76 DISSECTOR_ASSERT(actx->stack);
77 DISSECTOR_ASSERT(!strcmp(actx->stack->name, name));
78 actx->stack = actx->stack->next;
81 void asn1_stack_frame_check(asn1_ctx_t *actx, const gchar *name, const asn1_par_def_t *par_def) {
82 const asn1_par_def_t *pd = par_def;
85 DISSECTOR_ASSERT(actx->stack);
86 DISSECTOR_ASSERT(!strcmp(actx->stack->name, name));
88 par = actx->stack->par;
90 DISSECTOR_ASSERT(par);
91 DISSECTOR_ASSERT((pd->ptype == ASN1_PAR_IRR) || (par->ptype == pd->ptype));
96 DISSECTOR_ASSERT(!par);
99 static asn1_par_t *get_par_by_name(asn1_ctx_t *actx, const gchar *name) {
100 asn1_par_t *par = NULL;
102 DISSECTOR_ASSERT(actx->stack);
103 par = actx->stack->par;
105 if (!strcmp(par->name, name))
112 static asn1_par_t *push_new_par(asn1_ctx_t *actx) {
113 asn1_par_t *par, **pp;
115 DISSECTOR_ASSERT(actx->stack);
117 par = ep_new0(asn1_par_t);
119 pp = &(actx->stack->par);
127 void asn1_param_push_boolean(asn1_ctx_t *actx, gboolean value) {
130 par = push_new_par(actx);
131 par->ptype = ASN1_PAR_BOOLEAN;
132 par->value.v_boolean = value;
135 void asn1_param_push_integer(asn1_ctx_t *actx, gint32 value) {
138 par = push_new_par(actx);
139 par->ptype = ASN1_PAR_INTEGER;
140 par->value.v_integer = value;
143 gboolean asn1_param_get_boolean(asn1_ctx_t *actx, const gchar *name) {
144 asn1_par_t *par = NULL;
146 par = get_par_by_name(actx, name);
147 DISSECTOR_ASSERT(par);
148 return par->value.v_boolean;
151 gint32 asn1_param_get_integer(asn1_ctx_t *actx, const gchar *name) {
152 asn1_par_t *par = NULL;
154 par = get_par_by_name(actx, name);
155 DISSECTOR_ASSERT(par);
156 return par->value.v_integer;
162 void rose_ctx_init(rose_ctx_t *rctx) {
163 memset(rctx, '\0', sizeof(*rctx));
164 rctx->signature = ROSE_CTX_SIGNATURE;
167 gboolean rose_ctx_check_signature(rose_ctx_t *rctx) {
168 return rctx && (rctx->signature == ROSE_CTX_SIGNATURE);
171 void rose_ctx_clean_data(rose_ctx_t *rctx) {
172 memset(&rctx->d, '\0', sizeof(rctx->d));
176 asn1_ctx_t *get_asn1_ctx(void *ptr) {
177 asn1_ctx_t *actx = (asn1_ctx_t*)ptr;
179 if (!asn1_ctx_check_signature(actx))
185 rose_ctx_t *get_rose_ctx(void *ptr) {
186 rose_ctx_t *rctx = (rose_ctx_t*)ptr;
187 asn1_ctx_t *actx = (asn1_ctx_t*)ptr;
189 if (!asn1_ctx_check_signature(actx))
193 rctx = actx->rose_ctx;
195 if (!rose_ctx_check_signature(rctx))
201 double asn1_get_real(const guint8 *real_ptr, gint real_len) {
207 if (real_len < 1) return val;
211 if (octet & 0x80) { /* binary encoding */
212 } else if (octet & 0x40) { /* SpecialRealValue */
213 switch (octet & 0x3F) {
214 case 0x00: val = HUGE_VAL; break;
215 case 0x01: val = -HUGE_VAL; break;
217 } else { /* decimal encoding */
218 buf = ep_strndup(p, real_len);