diff --git a/applications/main/nfc/plugins/supported_cards/ndef.c b/applications/main/nfc/plugins/supported_cards/ndef.c index fb2c4da48..8a72ca222 100644 --- a/applications/main/nfc/plugins/supported_cards/ndef.c +++ b/applications/main/nfc/plugins/supported_cards/ndef.c @@ -181,29 +181,32 @@ static bool ndef_get(Ndef* ndef, size_t pos, size_t len, void* buf) { // So the first 93 (31*3) data blocks correspond to 128 real blocks. // Last 128 blocks are 8 sectors: 15 data blocks, 1 sector trailer. // So the last 120 (8*15) data blocks correspond to 128 real blocks. - div_t small_sector_data_blocks = div(pos, MF_CLASSIC_BLOCK_SIZE); + const size_t real_block_data_offset = pos % MF_CLASSIC_BLOCK_SIZE; + size_t small_sector_data_blocks = pos / MF_CLASSIC_BLOCK_SIZE; size_t large_sector_data_blocks = 0; - if(small_sector_data_blocks.quot > 93) { - large_sector_data_blocks = small_sector_data_blocks.quot - 93; - small_sector_data_blocks.quot = 93; + if(small_sector_data_blocks > 93) { + large_sector_data_blocks = small_sector_data_blocks - 93; + small_sector_data_blocks = 93; } - div_t small_sectors = div(small_sector_data_blocks.quot, 3); - size_t real_block = small_sectors.quot * 4 + small_sectors.rem; - if(small_sectors.quot >= 16) { + const size_t small_sector_block_offset = small_sector_data_blocks % 3; + const size_t small_sectors = small_sector_data_blocks / 3; + size_t real_block = small_sectors * 4 + small_sector_block_offset; + if(small_sectors >= 16) { real_block += 4; // Skip MAD2 } if(large_sector_data_blocks) { - div_t large_sectors = div(large_sector_data_blocks, 15); - real_block += large_sectors.quot * 16 + large_sectors.rem; + const size_t large_sector_block_offset = large_sector_data_blocks % 15; + const size_t large_sectors = large_sector_data_blocks / 15; + real_block += large_sectors * 16 + large_sector_block_offset; } - const uint8_t* cur = &ndef->mfc.blocks[real_block].data[small_sector_data_blocks.rem]; + const uint8_t* cur = &ndef->mfc.blocks[real_block].data[real_block_data_offset]; while(len) { size_t sector_trailer = mf_classic_get_sector_trailer_num_by_block(real_block); const uint8_t* end = &ndef->mfc.blocks[sector_trailer].data[0]; - size_t chunk_len = MIN((size_t)(end - cur), len); + const size_t chunk_len = MIN((size_t)(end - cur), len); memcpy(buf, cur, chunk_len); len -= chunk_len;