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nfc-read-forum-tag3: full parsing of NDEF Attribute Block

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Philippe Teuwen 2014-02-17 23:57:59 +01:00
parent 73c84c214d
commit 2aa4b99b7b
1 changed files with 45 additions and 10 deletions
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55
utils/nfc-read-forum-tag3.c
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@ -292,15 +292,50 @@ main(int argc, char *argv[])
exit(EXIT_FAILURE); exit(EXIT_FAILURE);
} }
fprintf(message_stream, "NDEF Attribute Block:\n");
const int ndef_major_version = (data[0] & 0xf0) >> 4; const int ndef_major_version = (data[0] & 0xf0) >> 4;
const int ndef_minor_version = (data[0] & 0x0f); const int ndef_minor_version = (data[0] & 0x0f);
fprintf(message_stream, "NDEF Mapping version: %d.%d\n", ndef_major_version, ndef_minor_version); fprintf(message_stream, "* Mapping version: %d.%d\n", ndef_major_version, ndef_minor_version);
const int available_block_count = (data[3] << 8) + data[4]; const int ndef_nbr = data[1];
fprintf(message_stream, "NFC Forum Tag Type 3 capacity: %d bytes\n", available_block_count * 16); fprintf(message_stream, "* Maximum nr of blocks to read by Check Command: %3d block%s\n", ndef_nbr, ndef_nbr > 1 ? "s" : "");
const int ndef_nbw = data[2];
fprintf(message_stream, "* Maximum nr of blocks to write by Update Command: %3d block%s\n", ndef_nbw, ndef_nbw > 1 ? "s" : "");
const int ndef_nmaxb = (data[3] << 8) + data[4];
fprintf(message_stream, "* Maximum nr of blocks available for NDEF data: %3d block%s (%d bytes)\n", ndef_nmaxb, ndef_nmaxb > 1 ? "s" : "", ndef_nmaxb * 16);
const int ndef_writeflag = data[9];
fprintf(message_stream, "* NDEF writing state: ");
switch (ndef_writeflag) {
case 0x00:
fprintf(message_stream, "finished (0x00)\n");
break;
case 0x0f:
fprintf(message_stream, "in progress (0x0F)\n");
break;
default:
fprintf(message_stream, "invalid (0x%02X)\n", ndef_writeflag);
break;
}
const int ndef_rwflag = data[10];
fprintf(message_stream, "* NDEF Access Attribute: ");
switch (ndef_rwflag) {
case 0x00:
fprintf(message_stream, "Read only (0x00)\n");
break;
case 0x01:
fprintf(message_stream, "Read/Write (0x01)\n");
break;
default:
fprintf(message_stream, "invalid (0x%02X)\n", ndef_rwflag);
break;
}
uint32_t ndef_data_len = (data[11] << 16) + (data[12] << 8) + data[13]; uint32_t ndef_data_len = (data[11] << 16) + (data[12] << 8) + data[13];
fprintf(message_stream, "NDEF data length: %d bytes\n", ndef_data_len); fprintf(message_stream, "* NDEF message length: %d bytes\n", ndef_data_len);
uint16_t ndef_calculated_checksum = 0; uint16_t ndef_calculated_checksum = 0;
for (size_t n = 0; n < 14; n++) for (size_t n = 0; n < 14; n++)
@ -308,15 +343,13 @@ main(int argc, char *argv[])
const uint16_t ndef_checksum = (data[14] << 8) + data[15]; const uint16_t ndef_checksum = (data[14] << 8) + data[15];
if (ndef_calculated_checksum != ndef_checksum) { if (ndef_calculated_checksum != ndef_checksum) {
fprintf(stderr, "NDEF CRC does not match with calculated one\n"); fprintf(message_stream, "* Checksum: fail (0x%04X != 0x%04X)\n", ndef_calculated_checksum, ndef_checksum);
fclose(ndef_stream); } else {
nfc_close(pnd); fprintf(message_stream, "* Checksum: ok (0x%04X)\n", ndef_checksum);
nfc_exit(context);
exit(EXIT_FAILURE);
} }
if (!ndef_data_len) { if (!ndef_data_len) {
fprintf(stderr, "Empty NFC Forum Tag Type 3\n"); fprintf(stderr, "Error: empty NFC Forum Tag Type 3, nothing to read!\n");
fclose(ndef_stream); fclose(ndef_stream);
nfc_close(pnd); nfc_close(pnd);
nfc_exit(context); nfc_exit(context);
@ -345,6 +378,8 @@ main(int argc, char *argv[])
nfc_close(pnd); nfc_close(pnd);
nfc_exit(context); nfc_exit(context);
exit(EXIT_FAILURE); exit(EXIT_FAILURE);
} else {
fprintf(stderr, "%i bytes written to %s\n", ndef_data_len, ndef_output);
} }
fclose(ndef_stream); fclose(ndef_stream);