no need to loop, only one block

utils/nfc-mfclassic.c

@@ -491,30 +491,28 @@ write_card(int write_block_zero)
 
  //Write Block 0 if requested to do so
  if (write_block_zero) {
- for (uiBlock = 0; uiBlock < 1; uiBlock++) {
-
- if (is_first_block(uiBlock)) {
- if (bFailure) {
- // When a failure occured we need to redo the anti-collision
- if (nfc_initiator_select_passive_target(pnd, nmMifare, NULL, 0, &nt) <= 0) {
+ uiBlock = 0;
+ is_first_block(0);
+ if (bFailure) {
+ // When a failure occured we need to redo the anti-collision
+ if (nfc_initiator_select_passive_target(pnd, nmMifare, NULL, 0, &nt) <= 0) {
  printf("!\nError: tag was removed\n");
  return false;
- }
- bFailure = false;
  }
+ bFailure = false;
+ }
 
  fflush(stdout);
  // Try to authenticate for the current sector
  // If we are are writing to a chinese magic card, we've already unlocked
  // If we're writing to a One Time Write, we need to authenticate
  // If we're writing something else, we'll need to authenticate
  if ((write_block_zero && magic3) || !write_block_zero) {
- if (!authenticate(uiBlock) && !bTolerateFailures) {
- printf("!\nError: authentication failed for block %02x\n", uiBlock);
+ if (!authenticate(0) && !bTolerateFailures) {
+ printf("!\nError: authentication failed for block 00\n");
  return false;
  }
  }
- }
 
  // Make sure a earlier write did not fail
  if (!bFailure) {
@@ -531,7 +529,7 @@ write_card(int write_block_zero)
  }
  if (!nfc_initiator_mifare_cmd(pnd, MC_WRITE, uiBlock, &mp)) {
  bFailure = true;
- printf("Failure to write to data block %i\n", uiBlock);
+ printf("Failure to write to data block 0\n");
  }
 
  } else {
@@ -544,7 +542,6 @@ write_card(int write_block_zero)
  return false;
 
  }
- }
 
  printf("|\n");
  printf("Done, %d of %d blocks written.\n", uiWriteBlocks, uiBlocks + 1);