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<h1>iso14443-subr.c</h1> </div>
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<a href="iso14443-subr_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*-</span>
<a name="l00002"></a>00002 <span class="comment"> * Public platform independent Near Field Communication (NFC) library</span>
<a name="l00003"></a>00003 <span class="comment"> * </span>
<a name="l00004"></a>00004 <span class="comment"> * Copyright (C) 2009, Roel Verdult</span>
<a name="l00005"></a>00005 <span class="comment"> * </span>
<a name="l00006"></a>00006 <span class="comment"> * This program is free software: you can redistribute it and/or modify it</span>
<a name="l00007"></a>00007 <span class="comment"> * under the terms of the GNU Lesser General Public License as published by the</span>
<a name="l00008"></a>00008 <span class="comment"> * Free Software Foundation, either version 3 of the License, or (at your</span>
<a name="l00009"></a>00009 <span class="comment"> * option) any later version.</span>
<a name="l00010"></a>00010 <span class="comment"> * </span>
<a name="l00011"></a>00011 <span class="comment"> * This program is distributed in the hope that it will be useful, but WITHOUT</span>
<a name="l00012"></a>00012 <span class="comment"> * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or</span>
<a name="l00013"></a>00013 <span class="comment"> * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for</span>
<a name="l00014"></a>00014 <span class="comment"> * more details.</span>
<a name="l00015"></a>00015 <span class="comment"> *</span>
<a name="l00016"></a>00016 <span class="comment"> * You should have received a copy of the GNU Lesser General Public License</span>
<a name="l00017"></a>00017 <span class="comment"> * along with this program. If not, see <http://www.gnu.org/licenses/></span>
<a name="l00018"></a>00018 <span class="comment"> */</span>
<a name="l00019"></a>00019
<a name="l00025"></a>00025 <span class="preprocessor">#ifdef HAVE_CONFIG_H</span>
<a name="l00026"></a>00026 <span class="preprocessor"></span><span class="preprocessor"># include "config.h"</span>
<a name="l00027"></a>00027 <span class="preprocessor">#endif // HAVE_CONFIG_H</span>
<a name="l00028"></a>00028 <span class="preprocessor"></span>
<a name="l00029"></a>00029 <span class="preprocessor">#include <stdio.h></span>
<a name="l00030"></a>00030
<a name="l00031"></a>00031 <span class="preprocessor">#include <nfc/nfc.h></span>
<a name="l00032"></a>00032
<a name="l00033"></a>00033 <span class="keywordtype">void</span>
<a name="l00034"></a>00034 iso14443a_crc (byte_t * pbtData, <span class="keywordtype">size_t</span> szLen, byte_t * pbtCrc)
<a name="l00035"></a>00035 {
<a name="l00036"></a>00036 byte_t bt;
<a name="l00037"></a>00037 uint32_t wCrc = 0x6363;
<a name="l00038"></a>00038
<a name="l00039"></a>00039 <span class="keywordflow">do</span> {
<a name="l00040"></a>00040 bt = *pbtData++;
<a name="l00041"></a>00041 bt = (bt ^ (byte_t) (wCrc & 0x00FF));
<a name="l00042"></a>00042 bt = (bt ^ (bt << 4));
<a name="l00043"></a>00043 wCrc = (wCrc >> 8) ^ ((uint32_t) bt << 8) ^ ((uint32_t) bt << 3) ^ ((uint32_t) bt >> 4);
<a name="l00044"></a>00044 } <span class="keywordflow">while</span> (--szLen);
<a name="l00045"></a>00045
<a name="l00046"></a>00046 *pbtCrc++ = (byte_t) (wCrc & 0xFF);
<a name="l00047"></a>00047 *pbtCrc = (byte_t) ((wCrc >> 8) & 0xFF);
<a name="l00048"></a>00048 }
<a name="l00049"></a>00049
<a name="l00050"></a>00050 <span class="keywordtype">void</span>
<a name="l00051"></a>00051 iso14443a_crc_append (byte_t * pbtData, <span class="keywordtype">size_t</span> szLen)
<a name="l00052"></a>00052 {
<a name="l00053"></a>00053 iso14443a_crc (pbtData, szLen, pbtData + szLen);
<a name="l00054"></a>00054 }
<a name="l00055"></a>00055
<a name="l00056"></a>00056 byte_t *
<a name="l00057"></a>00057 iso14443a_locate_historical_bytes(byte_t * pbtAts, <span class="keywordtype">size_t</span> szAts, <span class="keywordtype">size_t</span> * pszTk)
<a name="l00058"></a>00058 {
<a name="l00059"></a>00059 <span class="keywordflow">if</span> (szAts) {
<a name="l00060"></a>00060 <span class="keywordtype">size_t</span> offset = 1;
<a name="l00061"></a>00061 <span class="keywordflow">if</span> (pbtAts[0] & 0x10) { <span class="comment">// TA</span>
<a name="l00062"></a>00062 offset++;
<a name="l00063"></a>00063 }
<a name="l00064"></a>00064 <span class="keywordflow">if</span> (pbtAts[0] & 0x20) { <span class="comment">// TB</span>
<a name="l00065"></a>00065 offset++;
<a name="l00066"></a>00066 }
<a name="l00067"></a>00067 <span class="keywordflow">if</span> (pbtAts[0] & 0x40) { <span class="comment">// TC</span>
<a name="l00068"></a>00068 offset++;
<a name="l00069"></a>00069 }
<a name="l00070"></a>00070 <span class="keywordflow">if</span> (szAts > offset) {
<a name="l00071"></a>00071 *pszTk = (szAts-offset);
<a name="l00072"></a>00072 <span class="keywordflow">return</span> (pbtAts+offset);
<a name="l00073"></a>00073 }
<a name="l00074"></a>00074 }
<a name="l00075"></a>00075 *pszTk = 0;
<a name="l00076"></a>00076 <span class="keywordflow">return</span> NULL;
<a name="l00077"></a>00077 }
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