Rework data structures allocations / frees.

- New mifare_*_tag_new() functions for allocating and initialising memory for a given MIFARE tag;
  - Rename mifare_*_free_tag() to mifare_*_tag_free() for consistent names with mifare_*_tag_new() functions.

libfreefare/freefare.c

@@ -109,10 +109,10 @@ freefare_get_tags (nfc_device_t *device)
 	switch (type) {
 	    case CLASSIC_1K:
 	    case CLASSIC_4K:
-		tags[tag_count-1] = malloc (sizeof (struct mifare_classic_tag));
+		tags[tag_count-1] = mifare_classic_tag_new ();
 		break;
 	    case ULTRALIGHT:
-		tags[tag_count-1] = malloc (sizeof (struct mifare_ultralight_tag));
+		tags[tag_count-1] = mifare_ultralight_tag_new ();
 		break;
 	}
 
@@ -121,7 +121,7 @@ freefare_get_tags (nfc_device_t *device)
 
 	/*
 	 * Initialize common fields
-	 * (Target specific fields are initialized in mifare_*_connect())
+	 * (Target specific fields are initialized in mifare_*_tag_new())
 	 */
 	(tags[tag_count-1])->device = device;
 	(tags[tag_count-1])->info = target_info.nai;
@@ -155,10 +155,10 @@ freefare_free_tags (MifareTag *tags)
 	    switch (tags[i]->type) {
 		case CLASSIC_1K:
 		case CLASSIC_4K:
-		    mifare_classic_free_tag (tags[i]);
+		    mifare_classic_tag_free (tags[i]);
 		    break;
 		case ULTRALIGHT:
-		    mifare_ultralight_free_tag (tags[i]);
+		    mifare_ultralight_tag_free (tags[i]);
 		    break;
 	    }
 	}

libfreefare/freefare_internal.h

@@ -24,8 +24,10 @@ struct mad_sector_0x00;
 struct mad_sector_0x10;
 
 void		 crc8 (uint8_t *crc, const uint8_t value);
-void		 mifare_classic_free_tag (MifareTag tag);
+MifareTag	 mifare_classic_tag_new (void);
-void		 mifare_ultralight_free_tag (MifareTag tag);
+void		 mifare_classic_tag_free (MifareTag tag);
+MifareTag	 mifare_ultralight_tag_new (void);
+void		 mifare_ultralight_tag_free (MifareTag tag);
 uint8_t		 sector_0x00_crc8 (Mad mad);
 uint8_t		 sector_0x10_crc8 (Mad mad);
 

libfreefare/mifare_classic.c

@@ -131,22 +131,37 @@ int	 get_block_access_bits (MifareTag tag, const MifareClassicBlockNumber block,
 
 
 /*
- * MIFARE card communication preparation functions
+ * Memory management functions.
- *
- * The following functions send NFC commands to the initiator to prepare
- * communication with a MIFARE card, and perform required cleannups after using
- * the target.
  */
 
 /*
- * Free the provided tag list.
+ * Allocates and initialize a MIFARE Classic tag.
+ */
+
+MifareTag
+mifare_classic_tag_new (void)
+{
+    return malloc (sizeof (struct mifare_classic_tag));
+}
+
+/*
+ * Free the provided tag.
  */
 void
-mifare_classic_free_tag (MifareTag tag)
+mifare_classic_tag_free (MifareTag tag)
 {
     free (tag);
 }
 
+
+/*
+ * MIFARE card communication preparation functions
+ *
+ * The following functions send NFC commands to the initiator to prepare
+ * communication with a MIFARE card, and perform required cleanups after using
+ * the target.
+ */
+
 /*
  * Establish connection to the provided tag.
  */

libfreefare/mifare_ultralight.c

@@ -43,22 +43,37 @@
 
 
 /*
- * MIFARE card communication preparation functions
+ * Memory management functions.
- *
- * The following functions send NFC commands to the initiator to prepare
- * communication with a MIFARE card, and perform required cleannups after using
- * the target.
  */
 
 /*
- * Free the provided tag list.
+ * Allocates and initialize a MIFARE UltraLight tag.
+ */
+MifareTag
+mifare_ultralight_tag_new (void)
+{
+    return malloc (sizeof (struct mifare_ultralight_tag));
+}
+
+/*
+ * Free the provided tag.
  */
 void
-mifare_ultralight_free_tag (MifareTag tag)
+mifare_ultralight_tag_free (MifareTag tag)
 {
     free (tag);
 }
 
+
+/*
+ * MIFARE card communication preparation functions
+ *
+ * The following functions send NFC commands to the initiator to prepare
+ * communication with a MIFARE card, and perform required cleanups after using
+ * the target.
+ */
+
+
 /*
  * Establish connection to the provided tag.
  */