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nfc-utils: more decoding of ISO14443-4 Tk bytes

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This commit is contained in:
Philippe Teuwen 2010-10-15 08:57:58 +00:00
parent 91f73e1802
commit 655460059a
1 changed files with 23 additions and 1 deletions
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24
examples/nfc-utils.c
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@ -184,9 +184,31 @@ print_nfc_iso14443a_info (const nfc_iso14443a_info_t nai)
} }
} }
if (nai.szAtsLen > offset) { if (nai.szAtsLen > offset) {
// XXX More decoding can be done following ISO/IEC 7816-4 (8.1.1 Historical bytes)
printf ("* Historical bytes Tk: " ); printf ("* Historical bytes Tk: " );
print_hex (nai.abtAts + offset, (nai.szAtsLen - offset)); print_hex (nai.abtAts + offset, (nai.szAtsLen - offset));
byte_t CIB = nai.abtAts[offset];
offset++;
if (CIB != 0x00 && CIB != 0x10 && (CIB & 0xf0) != 0x80) {
printf(" * Proprietary format\n");
} else {
if (CIB == 0x00) {
printf(" * Tk after 0x00 consist of optional consecutive COMPACT-TLV data objects\n");
printf(" followed by a mandatory status indicator (the last three bytes, not in TLV)\n");
printf(" See ISO/IEC 7816-4 8.1.1.3 for more info\n");
}
if (CIB == 0x10) {
printf(" * DIR data reference: %02x\n", nai.abtAts[offset]);
}
if (CIB == 0x80) {
if (nai.szAtsLen == offset) {
printf(" * No COMPACT-TLV objects found, no status found\n");
} else {
printf(" * Tk after 0x80 consist of optional consecutive COMPACT-TLV data objects;\n");
printf(" the last data object may carry a status indicator of one, two or three bytes.\n");
printf(" See ISO/IEC 7816-4 8.1.1.3 for more info\n");
}
}
}
} }
} }
} }