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Added loading EMV transaction parameters from json file (#659)

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* added default params file
* added jansson
* added test function.
* added tlv tree to function
* add params from json works
* added to `hf emv exec`: load params from json and some refactoring
* added `scan` command
This commit is contained in:
Oleg Moiseenko 2018-09-18 08:15:34 +03:00 • committed by pwpiwi
commit 556826b5d5
26 changed files with 6515 additions and 23 deletions
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64
client/emv/tlv.c
View file

@ -318,6 +318,24 @@ struct tlvdb *tlvdb_find(struct tlvdb *tlvdb, tlv_tag_t tag) {
return NULL;
}
struct tlvdb *tlvdb_find_full(struct tlvdb *tlvdb, tlv_tag_t tag) {
if (!tlvdb)
return NULL;
for (; tlvdb; tlvdb = tlvdb->next) {
if (tlvdb->tag.tag == tag)
return tlvdb;
if (tlvdb->children) {
struct tlvdb * ch = tlvdb_find_full(tlvdb->children, tag);
if (ch)
return ch;
}
}
return NULL;
}
struct tlvdb *tlvdb_find_path(struct tlvdb *tlvdb, tlv_tag_t tag[]) {
int i = 0;
struct tlvdb *tnext = tlvdb;
@ -342,6 +360,52 @@ void tlvdb_add(struct tlvdb *tlvdb, struct tlvdb *other)
tlvdb->next = other;
}
void tlvdb_change_or_add_node(struct tlvdb *tlvdb, tlv_tag_t tag, size_t len, const unsigned char *value)
{
struct tlvdb *telm = tlvdb_find_full(tlvdb, tag);
if (telm == NULL) {
// new tlv element
tlvdb_add(tlvdb, tlvdb_fixed(tag, len, value));
} else {
// the same tlv structure
if (telm->tag.tag == tag && telm->tag.len == len && !memcmp(telm->tag.value, value, len))
return;
// replace tlv element
struct tlvdb *tnewelm = tlvdb_fixed(tag, len, value);
tnewelm->next = telm->next;
tnewelm->parent = telm->parent;
// if telm stayed first in children chain
if (telm->parent && telm->parent->children == telm) {
telm->parent->children = tnewelm;
}
// if telm have previous element
if (telm != tlvdb) {
// elm in root
struct tlvdb *celm = tlvdb;
// elm in child list of node
if (telm->parent && telm->parent->children)
celm = telm->parent->children;
// find previous element
for (; celm; celm = celm->next) {
if (celm->next == telm) {
celm->next = tnewelm;
break;
}
}
}
// free old element with childrens
telm->next = NULL;
tlvdb_free(telm);
}
return;
}
void tlvdb_visit(const struct tlvdb *tlvdb, tlv_cb cb, void *data, int level)
{
struct tlvdb *next = NULL;