crewID/libnfc
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Add a iso14443a function to extract Historical Bytes from ATS

Browse source
This commit is contained in:
Romuald Conty 2010-10-14 17:32:15 +00:00
parent 8142e69121
commit 4a50be27de
1 changed files with 23 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

23
libnfc/iso14443-subr.c
View file

@ -52,3 +52,26 @@ append_iso14443a_crc (byte_t * pbtData, size_t szLen)
{
iso14443a_crc (pbtData, szLen, pbtData + szLen);
}
byte_t *
extract_historical_bytes(byte_t * pbtAts, size_t szAts, size_t * pszHB)
{
if (szAts) {
size_t offset = 1;
if (pbtAts[0] & 0x10) { // TA
offset++;
}
if (pbtAts[0] & 0x20) { // TB
offset++;
}
if (pbtAts[0] & 0x40) { // TC
offset++;
}
if (szAts > offset) {
*pszHB = (szAts-offset);
return (pbtAts+offset);
}
}
*pszHB = 0;
return NULL;
}