the nfc decode now handling MFC dump files, it detects the MAD key and if so removes all sector trailers. this means a lot of zeros in the end might be there. And ndef prints a bunch of empty records. Better than before atleast

CHANGELOG.md

@@ -3,6 +3,7 @@ All notable changes to this project will be documented in this file.
 This project uses the changelog in accordance with [keepchangelog](http://keepachangelog.com/). Please use this to write notable changes, which is not the same as git commit log...
 
 ## [unreleased][unreleased]
+ - Changed `nfc decode -f` - now can detect and convert MFC dumpfiles to NDEF byte arrays (@iceman1001)
  - Changed `nfc decode` - now handles EXTERNAL RECORDS better (@iceman1001)
  - Fixed `nfc decode` - now handles NDEF Signature version1 records better (@iceman1001)
  - Added new standalone mode `LF_MULTIHID` - HID26 (H1031) multi simulator (@flamebarke)

client/src/cmdnfc.c

@@ -30,6 +30,8 @@
 #include "cmdhftopaz.h"
 #include "cmdnfc.h"
 #include "fileutils.h"
+#include "mifare/mifaredefault.h"
+#include "mifare/mad.h"
 
 void print_type4_cc_info(uint8_t *d, uint8_t n) {
     if (n < 0x0F) {
@@ -111,6 +113,17 @@ static int CmdNfcDecode(const char *Cmd) {
             return res;
         }
 
+        // convert from MFC dump file to a pure NDEF byte array
+        if (HasMADKey(dump)) {
+            PrintAndLogEx(SUCCESS, "MFC dump file detected. Converting...");
+            uint8_t ndef[4096] = {0};
+            uint16_t ndeflen = 0;
+            uint8_t skip = (4 * MFBLOCK_SIZE);
+            convert_mfc_2_arr(dump + skip, bytes_read - skip, ndef, &ndeflen);
+            memcpy(dump, ndef, ndeflen);
+            bytes_read = ndeflen;
+        }
+
         res = NDEFDecodeAndPrint(dump, bytes_read, verbose);
         if (res != PM3_SUCCESS) {
             PrintAndLogEx(INFO, "Trying to parse NDEF records w/o NDEF header");