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libnfc-devel-1.4.2-1.fc14.i686.rpm

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<h1>mifare.c</h1>  </div>
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<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 examples</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"> * Copyright (C) 2010, Romuald Conty, Romain Tartière</span>
<a name="l00006"></a>00006 <span class="comment"> * </span>
<a name="l00007"></a>00007 <span class="comment"> * Redistribution and use in source and binary forms, with or without</span>
<a name="l00008"></a>00008 <span class="comment"> * modification, are permitted provided that the following conditions are met:</span>
<a name="l00009"></a>00009 <span class="comment"> *  1) Redistributions of source code must retain the above copyright notice,</span>
<a name="l00010"></a>00010 <span class="comment"> *  this list of conditions and the following disclaimer. </span>
<a name="l00011"></a>00011 <span class="comment"> *  2 )Redistributions in binary form must reproduce the above copyright</span>
<a name="l00012"></a>00012 <span class="comment"> *  notice, this list of conditions and the following disclaimer in the</span>
<a name="l00013"></a>00013 <span class="comment"> *  documentation and/or other materials provided with the distribution.</span>
<a name="l00014"></a>00014 <span class="comment"> *</span>
<a name="l00015"></a>00015 <span class="comment"> * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS &quot;AS IS&quot;</span>
<a name="l00016"></a>00016 <span class="comment"> * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE</span>
<a name="l00017"></a>00017 <span class="comment"> * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE</span>
<a name="l00018"></a>00018 <span class="comment"> * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE</span>
<a name="l00019"></a>00019 <span class="comment"> * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR</span>
<a name="l00020"></a>00020 <span class="comment"> * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF</span>
<a name="l00021"></a>00021 <span class="comment"> * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS</span>
<a name="l00022"></a>00022 <span class="comment"> * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN</span>
<a name="l00023"></a>00023 <span class="comment"> * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)</span>
<a name="l00024"></a>00024 <span class="comment"> * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE</span>
<a name="l00025"></a>00025 <span class="comment"> * POSSIBILITY OF SUCH DAMAGE.</span>
<a name="l00026"></a>00026 <span class="comment"> * </span>
<a name="l00027"></a>00027 <span class="comment"> * Note that this license only applies on the examples, NFC library itself is under LGPL</span>
<a name="l00028"></a>00028 <span class="comment"> *</span>
<a name="l00029"></a>00029 <span class="comment"> */</span>
<a name="l00030"></a>00030 
<a name="l00031"></a>00031 <span class="preprocessor">#include &quot;mifare.h&quot;</span>
<a name="l00032"></a>00032 
<a name="l00033"></a>00033 <span class="preprocessor">#include &lt;string.h&gt;</span>
<a name="l00034"></a>00034 
<a name="l00035"></a>00035 <span class="preprocessor">#include &lt;nfc/nfc.h&gt;</span>
<a name="l00036"></a>00036 
<a name="l00050"></a>00050 <span class="keywordtype">bool</span>
<a name="l00051"></a>00051 nfc_initiator_mifare_cmd (<a class="code" href="structnfc__device__t.html" title="NFC device information.">nfc_device_t</a> * pnd, <span class="keyword">const</span> mifare_cmd mc, <span class="keyword">const</span> uint8_t ui8Block, mifare_param * pmp)
<a name="l00052"></a>00052 {
<a name="l00053"></a>00053   byte_t  abtRx[265];
<a name="l00054"></a>00054   <span class="keywordtype">size_t</span>  szRx;
<a name="l00055"></a>00055   <span class="keywordtype">size_t</span>  szParamLen;
<a name="l00056"></a>00056   byte_t  abtCmd[265];
<a name="l00057"></a>00057   <span class="keywordtype">bool</span>    bEasyFraming;
<a name="l00058"></a>00058 
<a name="l00059"></a>00059   <span class="comment">// Make sure we are dealing with a active device</span>
<a name="l00060"></a>00060   <span class="keywordflow">if</span> (!pnd-&gt;<a class="code" href="structnfc__device__t.html#ae89fdb258019e1c68073c31acc8a1367">bActive</a>)
<a name="l00061"></a>00061     <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00062"></a>00062 
<a name="l00063"></a>00063   abtCmd[0] = mc;               <span class="comment">// The MIFARE Classic command</span>
<a name="l00064"></a>00064   abtCmd[1] = ui8Block;         <span class="comment">// The block address (1K=0x00..0x39, 4K=0x00..0xff)</span>
<a name="l00065"></a>00065 
<a name="l00066"></a>00066   <span class="keywordflow">switch</span> (mc) {
<a name="l00067"></a>00067     <span class="comment">// Read and store command have no parameter</span>
<a name="l00068"></a>00068   <span class="keywordflow">case</span> MC_READ:
<a name="l00069"></a>00069   <span class="keywordflow">case</span> MC_STORE:
<a name="l00070"></a>00070     szParamLen = 0;
<a name="l00071"></a>00071     <span class="keywordflow">break</span>;
<a name="l00072"></a>00072 
<a name="l00073"></a>00073     <span class="comment">// Authenticate command</span>
<a name="l00074"></a>00074   <span class="keywordflow">case</span> MC_AUTH_A:
<a name="l00075"></a>00075   <span class="keywordflow">case</span> MC_AUTH_B:
<a name="l00076"></a>00076     szParamLen = <span class="keyword">sizeof</span> (mifare_param_auth);
<a name="l00077"></a>00077     <span class="keywordflow">break</span>;
<a name="l00078"></a>00078 
<a name="l00079"></a>00079     <span class="comment">// Data command</span>
<a name="l00080"></a>00080   <span class="keywordflow">case</span> MC_WRITE:
<a name="l00081"></a>00081     szParamLen = <span class="keyword">sizeof</span> (mifare_param_data);
<a name="l00082"></a>00082     <span class="keywordflow">break</span>;
<a name="l00083"></a>00083 
<a name="l00084"></a>00084     <span class="comment">// Value command</span>
<a name="l00085"></a>00085   <span class="keywordflow">case</span> MC_DECREMENT:
<a name="l00086"></a>00086   <span class="keywordflow">case</span> MC_INCREMENT:
<a name="l00087"></a>00087   <span class="keywordflow">case</span> MC_TRANSFER:
<a name="l00088"></a>00088     szParamLen = <span class="keyword">sizeof</span> (mifare_param_value);
<a name="l00089"></a>00089     <span class="keywordflow">break</span>;
<a name="l00090"></a>00090 
<a name="l00091"></a>00091     <span class="comment">// Please fix your code, you never should reach this statement</span>
<a name="l00092"></a>00092   <span class="keywordflow">default</span>:
<a name="l00093"></a>00093     <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00094"></a>00094     <span class="keywordflow">break</span>;
<a name="l00095"></a>00095   }
<a name="l00096"></a>00096 
<a name="l00097"></a>00097   <span class="comment">// When available, copy the parameter bytes</span>
<a name="l00098"></a>00098   <span class="keywordflow">if</span> (szParamLen)
<a name="l00099"></a>00099     memcpy (abtCmd + 2, (byte_t *) pmp, szParamLen);
<a name="l00100"></a>00100 
<a name="l00101"></a>00101   bEasyFraming = pnd-&gt;<a class="code" href="structnfc__device__t.html#a3abc6b0a43eff03de706bfbf26b83d66">bEasyFraming</a>;
<a name="l00102"></a>00102   <span class="keywordflow">if</span> (!<a class="code" href="nfc_8c.html#a6cd940508b34b99c6c94173f8300d069" title="Configure advanced NFC device settings.">nfc_configure</a> (pnd, <a class="code" href="nfc-types_8h.html#ab2cdef5e5ac453e9c60c9fe449cb311eabb3413ff22c634f90298444e0fffed5f">NDO_EASY_FRAMING</a>, <span class="keyword">true</span>)) {
<a name="l00103"></a>00103     <a class="code" href="nfc_8c.html#a111b9182fc80b309b56009e9c6be7454" title="Display the PCD error a-la perror.">nfc_perror</a> (pnd, <span class="stringliteral">&quot;nfc_configure&quot;</span>);
<a name="l00104"></a>00104     <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00105"></a>00105   }
<a name="l00106"></a>00106   <span class="comment">// Fire the mifare command</span>
<a name="l00107"></a>00107   <span class="keywordflow">if</span> (!<a class="code" href="nfc_8c.html#a9e32d7ad73ef60bb198a8f0d36da0890" title="Send data to target then retrieve data from target.">nfc_initiator_transceive_bytes</a> (pnd, abtCmd, 2 + szParamLen, abtRx, &amp;szRx)) {
<a name="l00108"></a>00108     <span class="keywordflow">if</span> (pnd-&gt;<a class="code" href="structnfc__device__t.html#a3cc2631649285ff97395e20d8abd1e6f">iLastError</a> == EINVRXFRAM) {
<a name="l00109"></a>00109       <span class="comment">// &quot;Invalid received frame&quot; AKA EINVRXFRAM,  usual means we are</span>
<a name="l00110"></a>00110       <span class="comment">// authenticated on a sector but the requested MIFARE cmd (read, write)</span>
<a name="l00111"></a>00111       <span class="comment">// is not permitted by current acces bytes;</span>
<a name="l00112"></a>00112       <span class="comment">// So there is nothing to do here.</span>
<a name="l00113"></a>00113     } <span class="keywordflow">else</span> {
<a name="l00114"></a>00114       <a class="code" href="nfc_8c.html#a111b9182fc80b309b56009e9c6be7454" title="Display the PCD error a-la perror.">nfc_perror</a> (pnd, <span class="stringliteral">&quot;nfc_initiator_transceive_bytes&quot;</span>);
<a name="l00115"></a>00115     }
<a name="l00116"></a>00116     <a class="code" href="nfc_8c.html#a6cd940508b34b99c6c94173f8300d069" title="Configure advanced NFC device settings.">nfc_configure</a> (pnd, <a class="code" href="nfc-types_8h.html#ab2cdef5e5ac453e9c60c9fe449cb311eabb3413ff22c634f90298444e0fffed5f">NDO_EASY_FRAMING</a>, bEasyFraming);
<a name="l00117"></a>00117     <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00118"></a>00118   }
<a name="l00119"></a>00119   <span class="keywordflow">if</span> (!<a class="code" href="nfc_8c.html#a6cd940508b34b99c6c94173f8300d069" title="Configure advanced NFC device settings.">nfc_configure</a> (pnd, <a class="code" href="nfc-types_8h.html#ab2cdef5e5ac453e9c60c9fe449cb311eabb3413ff22c634f90298444e0fffed5f">NDO_EASY_FRAMING</a>, bEasyFraming)) {
<a name="l00120"></a>00120     <a class="code" href="nfc_8c.html#a111b9182fc80b309b56009e9c6be7454" title="Display the PCD error a-la perror.">nfc_perror</a> (pnd, <span class="stringliteral">&quot;nfc_configure&quot;</span>);
<a name="l00121"></a>00121     <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00122"></a>00122   }
<a name="l00123"></a>00123 
<a name="l00124"></a>00124   <span class="comment">// When we have executed a read command, copy the received bytes into the param</span>
<a name="l00125"></a>00125   <span class="keywordflow">if</span> (mc == MC_READ) {
<a name="l00126"></a>00126     <span class="keywordflow">if</span> (szRx == 16) {
<a name="l00127"></a>00127       memcpy (pmp-&gt;mpd.abtData, abtRx, 16);
<a name="l00128"></a>00128     } <span class="keywordflow">else</span> {
<a name="l00129"></a>00129       <span class="keywordflow">return</span> <span class="keyword">false</span>;
<a name="l00130"></a>00130     }
<a name="l00131"></a>00131   }
<a name="l00132"></a>00132   <span class="comment">// Command succesfully executed</span>
<a name="l00133"></a>00133   <span class="keywordflow">return</span> <span class="keyword">true</span>;
<a name="l00134"></a>00134 }
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