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

[proxmark3-svn] / client / emv / tlv.c

diff --git a/client/emv/tlv.c b/client/emv/tlv.c
index 24125cc7d3175dd341eac4811dcdf4f9904cd94e..776fdeed3efa12bbcda056bbae066c113a8f93de 100644 (file)
--- a/client/emv/tlv.c
+++ b/client/emv/tlv.c
@@ -299,6 +299,58 @@ void tlvdb_free(struct tlvdb *tlvdb)
        }
 }
 
+struct tlvdb *tlvdb_find_next(struct tlvdb *tlvdb, tlv_tag_t tag) {
+       if (!tlvdb)
+               return NULL;
+       
+       return tlvdb_find(tlvdb->next, tag);
+}
+
+struct tlvdb *tlvdb_find(struct tlvdb *tlvdb, tlv_tag_t tag) {
+       if (!tlvdb)
+               return NULL;
+       
+       for (; tlvdb; tlvdb = tlvdb->next) {
+               if (tlvdb->tag.tag == tag)
+                       return tlvdb;
+       }
+
+       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;
+       
+       while (tnext && tag[i]) {
+               tnext = tlvdb_find(tnext, tag[i]);
+               i++;
+               if (tag[i] && tnext) {
+                       tnext = tnext->children;
+               }
+       }
+       
+       return tnext;
+}
+
 void tlvdb_add(struct tlvdb *tlvdb, struct tlvdb *other)
 {
        while (tlvdb->next) {
@@ -308,6 +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;
@@ -317,9 +415,8 @@ void tlvdb_visit(const struct tlvdb *tlvdb, tlv_cb cb, void *data, int level)
 
        for (; tlvdb; tlvdb = next) {
                next = tlvdb->next;
-               bool is_leaf = (tlvdb->children == NULL);
-               cb(data, &tlvdb->tag, level, is_leaf);
-               tlvdb_visit(tlvdb->children, cb, data, level+1);
+               cb(data, &tlvdb->tag, level, (tlvdb->children == NULL));
+               tlvdb_visit(tlvdb->children, cb, data, level + 1);
        }
 }
 
@@ -356,6 +453,11 @@ const struct tlv *tlvdb_get(const struct tlvdb *tlvdb, tlv_tag_t tag, const stru
        return NULL;
 }
 
+const struct tlv *tlvdb_get_inchild(const struct tlvdb *tlvdb, tlv_tag_t tag, const struct tlv *prev) {
+       tlvdb = tlvdb->children;
+       return tlvdb_get(tlvdb, tag, prev);
+}
+
 unsigned char *tlv_encode(const struct tlv *tlv, size_t *len)
 {
        size_t size = tlv->len;