now skips non ndef formmated sectors

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]
+ - Fixed `hf mf ndefwrite` - now skips not ndef formatted sectors (@iceman1001)
  - Fixed `hf mf ndefread` - now skips not ndef formatted sectors correctly (@iceman1001)
  - Fixed `lf hitag` - keep inside the arrays for key/password/nrar (@iceman1001)
  - Added `hf mf ndefwrite` - write raw NDEF records to MIFARE Classic tag (@iceman1001)

client/src/cmdhfmf.c

@@ -6139,9 +6139,15 @@ int CmdHFMFNDEFWrite(const char *Cmd) {
 
         PrintAndLogEx(INPLACE, "%u", block_no);
 
+        // find next available block
         block_no++;
         if (mfIsSectorTrailer(block_no)) {
             block_no++;
+
+            // skip sectors which isn't ndef formatted
+            while ( freemem[mfSectorNum(block_no)] == 0 ) {
+                block_no++;
+            }
         }
 
         bytes -= MFBLOCK_SIZE;