TLV decoding works
[proxmark3-svn] / client / emv / tlv.h
1 /*
2 * libopenemv - a library to work with EMV family of smart cards
3 * Copyright (C) 2012, 2015 Dmitry Eremin-Solenikov
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2.1 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
14 *
15 * https://github.com/lumag/emv-tools/blob/master/lib/include/openemv/tlv.h
16 */
17
18 #ifndef TLV_H
19 #define TLV_H
20
21 #include <stdbool.h>
22 #include <stddef.h>
23 #include <stdint.h>
24
25 typedef uint16_t tlv_tag_t;
26
27 struct tlv {
28 tlv_tag_t tag;
29 size_t len;
30 const unsigned char *value;
31 };
32
33 struct tlvdb;
34 typedef bool (*tlv_cb)(void *data, const struct tlv *tlv);
35
36 struct tlvdb *tlvdb_fixed(tlv_tag_t tag, size_t len, const unsigned char *value);
37 struct tlvdb *tlvdb_external(tlv_tag_t tag, size_t len, const unsigned char *value);
38 struct tlvdb *tlvdb_parse(const unsigned char *buf, size_t len);
39 struct tlvdb *tlvdb_parse_multi(const unsigned char *buf, size_t len);
40 void tlvdb_free(struct tlvdb *tlvdb);
41
42 void tlvdb_add(struct tlvdb *tlvdb, struct tlvdb *other);
43
44 void tlvdb_visit(const struct tlvdb *tlvdb, tlv_cb cb, void *data);
45 const struct tlv *tlvdb_get(const struct tlvdb *tlvdb, tlv_tag_t tag, const struct tlv *prev);
46
47 bool tlv_parse_tl(const unsigned char **buf, size_t *len, struct tlv *tlv);
48 unsigned char *tlv_encode(const struct tlv *tlv, size_t *len);
49 bool tlv_is_constructed(const struct tlv *tlv);
50 bool tlv_equal(const struct tlv *a, const struct tlv *b);
51
52 #endif
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