From 99b261d132d07fb4a23003cf50d160be0afb3e25 Mon Sep 17 00:00:00 2001
From: Romuald Conty <romuald@libnfc.org>
Date: Tue, 20 Apr 2010 15:17:17 +0000
Subject: [PATCH] add freefare_free_tag() to free only one tag and add
 freefare_duplicate_tag() in order to copy a tag struct.

---
 libfreefare/freefare.c | 55 +++++++++++++++++++++++++++++++++++-------
 libfreefare/freefare.h |  2 ++
 2 files changed, 48 insertions(+), 9 deletions(-)

diff --git a/libfreefare/freefare.c b/libfreefare/freefare.c
index b3b63b2..853ff51 100644
--- a/libfreefare/freefare.c
+++ b/libfreefare/freefare.c
@@ -130,6 +130,32 @@ freefare_get_tags (nfc_device_t *device)
     return tags;
 }
 
+/*
+ * Duplicate a tag
+ */
+MifareTag
+freefare_duplicate_tag (MifareTag tag)
+{
+    MifareTag ret;
+
+    /* Allocate memory for the MIFARE target */
+    switch (tag->tag_info->type) {
+	case CLASSIC_1K:
+	case CLASSIC_4K:
+	    ret = mifare_classic_tag_new ();
+
+	    break;
+	case ULTRALIGHT:
+	    ret = mifare_ultralight_tag_new ();
+	    break;
+    }
+    ret->device = tag->device;
+    ret->info = tag->info;
+    ret->active = tag->active;
+    ret->tag_info = tag->tag_info;
+    return ret;
+}
+
 /*
  * Returns the type of the provided tag.
  */
@@ -160,6 +186,25 @@ freefare_get_tag_uid (MifareTag tag)
     return res;
 }
 
+/*
+ * Free the provided tag.
+ */
+void
+freefare_free_tag (MifareTag tag)
+{
+    if (tag) {
+	switch (tag->tag_info->type) {
+	    case CLASSIC_1K:
+	    case CLASSIC_4K:
+		mifare_classic_tag_free (tag);
+		break;
+	    case ULTRALIGHT:
+		mifare_ultralight_tag_free (tag);
+		break;
+	}
+    }
+}
+
 /*
  * Free the provided tag list.
  */
@@ -168,15 +213,7 @@ freefare_free_tags (MifareTag *tags)
 {
     if (tags) {
 	for (int i=0; tags[i]; i++) {
-	    switch (tags[i]->tag_info->type) {
-		case CLASSIC_1K:
-		case CLASSIC_4K:
-		    mifare_classic_tag_free (tags[i]);
-		    break;
-		case ULTRALIGHT:
-		    mifare_ultralight_tag_free (tags[i]);
-		    break;
-	    }
+	    freefare_free_tag(tags[i]);
 	}
 	free (tags);
     }
diff --git a/libfreefare/freefare.h b/libfreefare/freefare.h
index f1475fa..1f1ae89 100644
--- a/libfreefare/freefare.h
+++ b/libfreefare/freefare.h
@@ -52,9 +52,11 @@ typedef uint8_t MifareUltralightPageNumber;
 typedef unsigned char MifareUltralightPage[4];
 
 MifareTag	*freefare_get_tags (nfc_device_t *device);
+MifareTag	 freefare_duplicate_tag (MifareTag tag);
 enum mifare_tag_type freefare_get_tag_type (MifareTag tag);
 const char	*freefare_get_tag_friendly_name (MifareTag tag);
 char		*freefare_get_tag_uid (MifareTag tag);
+void		 freefare_free_tag (MifareTag tag);
 void		 freefare_free_tags (MifareTag *tags);
 
 int		 mifare_ultralight_connect (MifareTag tag);