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Willy-JL
2025-03-24 01:05:46 +00:00
parent 849d68cbb7
commit a9c24e229a
1 changed files with 14 additions and 11 deletions
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applications/main/nfc/plugins/supported_cards/ndef.c
+14 -11
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@@ -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;