X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/137dd5826ed8d69b8eb00f1a6bcdbbecf6b072e2..0d2624a0cc13dbe34392da1f8495af6c64a84ddb:/client/emv/tlv.c

diff --git a/client/emv/tlv.c b/client/emv/tlv.c
index 1be91777..35bdb5d4 100644
--- a/client/emv/tlv.c
+++ b/client/emv/tlv.c
@@ -92,16 +92,15 @@ static size_t tlv_parse_len(const unsigned char **buf, size_t *len)
 		return l;
 
 	size_t ll = l &~ TLV_LEN_LONG;
-	if (*len < ll)
+	if (ll > 5)
 		return TLV_LEN_INVALID;
 
-	/* FIXME */
-	if (ll != 1)
-		return TLV_LEN_INVALID;
-
-	l = **buf;
-	--*len;
-	++*buf;
+	l = 0;
+	for (int i = 1; i <= ll; i++) {
+		l = (l << 8) + **buf;
+		--*len;
+		++*buf;
+	}
 
 	return l;
 }
@@ -318,6 +317,24 @@ 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 +359,52 @@ 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;
@@ -394,6 +457,10 @@ const struct tlv *tlvdb_get_inchild(const struct tlvdb *tlvdb, tlv_tag_t tag, co
 	return tlvdb_get(tlvdb, tag, prev);
 }
 
+const struct tlv *tlvdb_get_tlv(const struct tlvdb *tlvdb) {
+	return &tlvdb->tag;
+}
+
 unsigned char *tlv_encode(const struct tlv *tlv, size_t *len)
 {
 	size_t size = tlv->len;
@@ -452,3 +519,18 @@ bool tlv_equal(const struct tlv *a, const struct tlv *b)
 
 	return a->tag == b->tag && a->len == b->len && !memcmp(a->value, b->value, a->len);
 }
+
+struct tlvdb *tlvdb_elm_get_next(struct tlvdb *tlvdb)
+{
+	return tlvdb->next;
+}
+
+struct tlvdb *tlvdb_elm_get_children(struct tlvdb *tlvdb)
+{
+	return tlvdb->children;
+}
+
+struct tlvdb *tlvdb_elm_get_parent(struct tlvdb *tlvdb)
+{
+	return tlvdb->parent;
+}