1<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 2<html xmlns="http://www.w3.org/1999/xhtml"> 3<head> 4<meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/> 5<meta http-equiv="X-UA-Compatible" content="IE=9"/> 6<meta name="generator" content="Doxygen 1.8.13"/> 7<meta name="viewport" content="width=device-width, initial-scale=1"/> 8<title>ISSDK: drivers/host/data_format_hdlc.c Source File</title> 9<link href="tabs.css" rel="stylesheet" type="text/css"/> 10<script type="text/javascript" src="jquery.js"></script> 11<script type="text/javascript" src="dynsections.js"></script> 12<link href="issdk_stylesheet.css" rel="stylesheet" type="text/css" /> 13</head> 14<body> 15<div id="top"><!-- do not remove this div, it is closed by doxygen! --> 16<div id="titlearea"> 17<table cellspacing="0" cellpadding="0"> 18 <tbody> 19 <tr style="height: 56px;"> 20 <td id="projectlogo"><img alt="Logo" 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</div> 49</div><!--header--> 50<div class="contents"> 51<a href="a00509.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">/*</span></div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment"> * Copyright (c) 2016, Freescale Semiconductor, Inc.</span></div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> * Copyright 2016-2017 NXP</span></div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> * All rights reserved.</span></div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> *</span></div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> * SPDX-License-Identifier: BSD-3-Clause</span></div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> */</span></div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"></span></div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment">/**</span></div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment">* @file data_format_hdlc.c</span></div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment">* @brief The data_format_hdlc.c file contains definitions for</span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> encoding and decoding HDLC messages to and from Host.</span></div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment">*/</span></div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> </div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment">/*******************************************************************************</span></div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> * ISSDK Includes</span></div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"> ******************************************************************************/</span></div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="preprocessor">#include "<a class="code" href="a00512.html">data_format_hdlc.h</a>"</span></div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span> </div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment">/*******************************************************************************</span></div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment"> * Functions</span></div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment"> ******************************************************************************/</span></div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment">/* Function to handle incomming HDLC encoded bytes form the Host over UART. */</span></div><div class="line"><a name="l00024"></a><span class="lineno"><a class="line" href="a00512.html#af69cf775e44516f29d6ba5a93eacfbd8"> 24</a></span> <span class="keywordtype">bool</span> <a class="code" href="a00509.html#af69cf775e44516f29d6ba5a93eacfbd8">HDLC_Process_Rx_Byte</a>(uint8_t c, <a class="code" href="a02927.html">host_rx_packet_t</a> *pHostRxPkt)</div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span> {</div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  <span class="keyword">static</span> uint8_t c_prev = 0;</div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  <span class="keywordtype">bool</span> bRxPacketerror = <span class="keyword">false</span>, bPacketReceived = <span class="keyword">false</span>;</div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span> </div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  <span class="keywordflow">switch</span> (pHostRxPkt-><a class="code" href="a02927.html#a5e3ddc14966666f4daa793c9c4f13810">rxState</a>) <span class="comment">/* Process the character. */</span></div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  {</div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  <span class="keywordflow">case</span> <a class="code" href="a00512.html#ad559b3ed307be626eacea8b56942de61a899cfe3ad46b26410f19b819dc9d38ae">HOST_RX_STATE_WAITFORPACKETMARKER</a>:</div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  <span class="keywordflow">if</span> (c == 0x7E)</div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  { <span class="comment">/* Wait for the remaining packet. */</span></div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  pHostRxPkt-><a class="code" href="a02927.html#a000f6e2acab93210fdd84fa0709c95ca">mIndex</a> = 0;</div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  pHostRxPkt-><a class="code" href="a02927.html#a5e3ddc14966666f4daa793c9c4f13810">rxState</a> = <a class="code" href="a00512.html#ad559b3ed307be626eacea8b56942de61a2f92b30f9cb47689d11946c7a84e6d16">HOST_RX_STATE_GETTINGPACKETDATA</a>;</div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  }</div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  <span class="keywordflow">break</span>;</div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span>  <span class="keywordflow">case</span> <a class="code" href="a00512.html#ad559b3ed307be626eacea8b56942de61a2f92b30f9cb47689d11946c7a84e6d16">HOST_RX_STATE_GETTINGPACKETDATA</a>:</div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  <span class="keywordflow">if</span> (c != 0x7E)</div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  { <span class="comment">/* Got some real data (non-marker char).</span></div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="comment"> * Do escape decode if needed. */</span></div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  <span class="keywordflow">if</span> (c == 0x7D)</div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span>  {</div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  c_prev = c;</div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  <span class="keywordflow">break</span>;</div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  }</div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span> (c_prev == 0x7D)</div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  {</div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  <span class="keywordflow">if</span> (c == 0x5D)</div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  {</div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  c = 0x7D;</div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  }</div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span> (c == 0x5E)</div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  {</div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  c = 0x7E;</div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  }</div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  <span class="keywordflow">else</span></div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  { <span class="comment">/* Illegal escape sequence. Reset and wait for next packet. */</span></div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  bRxPacketerror = <span class="keyword">true</span>;</div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  }</div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  c_prev = 0;</div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  }</div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <span class="comment">/* Escape decode done. Just got data byte, save it. */</span></div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  pHostRxPkt-><a class="code" href="a02927.html#a7154405d775832040d46ee3336363378">pRxbuf</a>[pHostRxPkt-><a class="code" href="a02927.html#a000f6e2acab93210fdd84fa0709c95ca">mIndex</a>] = c;</div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span>  ++(pHostRxPkt-><a class="code" href="a02927.html#a000f6e2acab93210fdd84fa0709c95ca">mIndex</a>);</div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  }</div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <span class="keywordflow">else</span></div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  {</div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  <span class="comment">/* Got packet marker while waiting for data. */</span></div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  <span class="keywordflow">if</span> (pHostRxPkt-><a class="code" href="a02927.html#a000f6e2acab93210fdd84fa0709c95ca">mIndex</a> > 0)</div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  { <span class="comment">/* Got a complete packet.</span></div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span> <span class="comment"> * Set state wait for next packet. */</span></div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  pHostRxPkt-><a class="code" href="a02927.html#a5e3ddc14966666f4daa793c9c4f13810">rxState</a> = <a class="code" href="a00512.html#ad559b3ed307be626eacea8b56942de61a899cfe3ad46b26410f19b819dc9d38ae">HOST_RX_STATE_WAITFORPACKETMARKER</a>;</div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <span class="comment">/* Set flag to process packet just received. */</span></div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  bPacketReceived = <span class="keyword">true</span>;</div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  }</div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  <span class="keywordflow">else</span></div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  {</div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  <span class="comment">/* We got back to back packet marker. This 2nd packet marker will</span></div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span> <span class="comment"> * then be treated as a start marker. Go back to wait for data. */</span></div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  pHostRxPkt-><a class="code" href="a02927.html#a5e3ddc14966666f4daa793c9c4f13810">rxState</a> = <a class="code" href="a00512.html#ad559b3ed307be626eacea8b56942de61a2f92b30f9cb47689d11946c7a84e6d16">HOST_RX_STATE_GETTINGPACKETDATA</a>;</div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  pHostRxPkt-><a class="code" href="a02927.html#a000f6e2acab93210fdd84fa0709c95ca">mIndex</a> = 0;</div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  }</div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  }</div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  <span class="keywordflow">break</span>;</div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  <span class="keywordflow">default</span>:</div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  <span class="comment">/* Unknown state. */</span></div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  bRxPacketerror = <span class="keyword">true</span>;</div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  <span class="keywordflow">break</span>;</div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  }</div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span> </div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  <span class="comment">/* Handle packet error. */</span></div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  <span class="keywordflow">if</span> (bRxPacketerror == <span class="keyword">true</span>)</div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  {</div><div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  pHostRxPkt-><a class="code" href="a02927.html#a000f6e2acab93210fdd84fa0709c95ca">mIndex</a> = 0;</div><div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  pHostRxPkt-><a class="code" href="a02927.html#a5e3ddc14966666f4daa793c9c4f13810">rxState</a> = <a class="code" href="a00512.html#ad559b3ed307be626eacea8b56942de61a899cfe3ad46b26410f19b819dc9d38ae">HOST_RX_STATE_WAITFORPACKETMARKER</a>;</div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  }</div><div class="line"><a name="l00098"></a><span class="lineno"> 98</span> </div><div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  <span class="keywordflow">return</span> bPacketReceived;</div><div class="line"><a name="l00100"></a><span class="lineno"> 100</span> }</div><div class="line"><a name="l00101"></a><span class="lineno"> 101</span> </div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span> <span class="comment">/* Function to format data for HDLC and send bytes to Host over UART. */</span></div><div class="line"><a name="l00103"></a><span class="lineno"><a class="line" href="a00512.html#a1b0cdde224e0adf381d431058d2de34a"> 103</a></span> <span class="keywordtype">size_t</span> <a class="code" href="a00509.html#a1b0cdde224e0adf381d431058d2de34a">HDLC_Process_Tx_Msg</a>(<span class="keyword">const</span> uint8_t *pBuffer, uint8_t *pMsg, <span class="keywordtype">size_t</span> <a class="code" href="a00521.html#a18e09d6eabccd6dfc2d5066542020e59">size</a>)</div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span> {</div><div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  <span class="keywordtype">size_t</span> index = 0;</div><div class="line"><a name="l00106"></a><span class="lineno"> 106</span> </div><div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  <span class="keywordflow">if</span> (pBuffer == NULL || pMsg == NULL || size == 0)</div><div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  {</div><div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  <span class="keywordflow">return</span> 0;</div><div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  }</div><div class="line"><a name="l00111"></a><span class="lineno"> 111</span> </div><div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  <span class="comment">/* Construct the Host Message. */</span></div><div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  pMsg[index++] = 0x7E; <span class="comment">/* Add the Start marker. */</span></div><div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  <span class="keywordflow">for</span> (<span class="keywordtype">size_t</span> offset = 0; offset < <a class="code" href="a00521.html#a18e09d6eabccd6dfc2d5066542020e59">size</a>; offset++)</div><div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  {</div><div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  <span class="keywordflow">switch</span> (pBuffer[offset])</div><div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  {</div><div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  <span class="keywordflow">case</span> 0x7D: <span class="comment">/* Add escape sequence for escape character. */</span></div><div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  pMsg[index++] = 0x7D;</div><div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  pMsg[index++] = 0x5D;</div><div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  <span class="keywordflow">break</span>;</div><div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  <span class="keywordflow">case</span> 0x7E: <span class="comment">/* Add escape sequence for start/stop character. */</span></div><div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  pMsg[index++] = 0x7D;</div><div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  pMsg[index++] = 0x5E;</div><div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  <span class="keywordflow">break</span>;</div><div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  <span class="keywordflow">default</span>: <span class="comment">/* Add the actual character. */</span></div><div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  pMsg[index++] = pBuffer[offset];</div><div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  }</div><div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  }</div><div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  pMsg[index++] = 0x7E; <span class="comment">/* Add the Stop marker. */</span></div><div class="line"><a name="l00131"></a><span class="lineno"> 131</span> </div><div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  <span class="keywordflow">return</span> index;</div><div class="line"><a name="l00133"></a><span class="lineno"> 133</span> }</div><div class="ttc" id="a00521_html_a18e09d6eabccd6dfc2d5066542020e59"><div class="ttname"><a href="a00521.html#a18e09d6eabccd6dfc2d5066542020e59">size</a></div><div class="ttdeci">uint32_t size</div><div class="ttdef"><b>Definition:</b> <a href="a00521_source.html#l00043">data_format_service.h:43</a></div></div> 52<div class="ttc" id="a00512_html_ad559b3ed307be626eacea8b56942de61a899cfe3ad46b26410f19b819dc9d38ae"><div class="ttname"><a href="a00512.html#ad559b3ed307be626eacea8b56942de61a899cfe3ad46b26410f19b819dc9d38ae">HOST_RX_STATE_WAITFORPACKETMARKER</a></div><div class="ttdef"><b>Definition:</b> <a href="a00512_source.html#l00033">data_format_hdlc.h:33</a></div></div> 53<div class="ttc" id="a02927_html"><div class="ttname"><a href="a02927.html">host_rx_packet_t</a></div><div class="ttdoc">This structure holds information to receive a packet of data to the host. </div><div class="ttdef"><b>Definition:</b> <a href="a00101_source.html#l00049">host_io_uart.h:49</a></div></div> 54<div class="ttc" id="a02927_html_a7154405d775832040d46ee3336363378"><div class="ttname"><a href="a02927.html#a7154405d775832040d46ee3336363378">host_rx_packet_t::pRxbuf</a></div><div class="ttdeci">uint8_t * pRxbuf</div><div class="ttdef"><b>Definition:</b> <a href="a00101_source.html#l00053">host_io_uart.h:53</a></div></div> 55<div class="ttc" id="a00509_html_af69cf775e44516f29d6ba5a93eacfbd8"><div class="ttname"><a href="a00509.html#af69cf775e44516f29d6ba5a93eacfbd8">HDLC_Process_Rx_Byte</a></div><div class="ttdeci">bool HDLC_Process_Rx_Byte(uint8_t c, host_rx_packet_t *pHostRxPkt)</div><div class="ttdef"><b>Definition:</b> <a href="a00509_source.html#l00024">data_format_hdlc.c:24</a></div></div> 56<div class="ttc" id="a00509_html_a1b0cdde224e0adf381d431058d2de34a"><div class="ttname"><a href="a00509.html#a1b0cdde224e0adf381d431058d2de34a">HDLC_Process_Tx_Msg</a></div><div class="ttdeci">size_t HDLC_Process_Tx_Msg(const uint8_t *pBuffer, uint8_t *pMsg, size_t size)</div><div class="ttdef"><b>Definition:</b> <a href="a00509_source.html#l00103">data_format_hdlc.c:103</a></div></div> 57<div class="ttc" id="a00512_html_ad559b3ed307be626eacea8b56942de61a2f92b30f9cb47689d11946c7a84e6d16"><div class="ttname"><a href="a00512.html#ad559b3ed307be626eacea8b56942de61a2f92b30f9cb47689d11946c7a84e6d16">HOST_RX_STATE_GETTINGPACKETDATA</a></div><div class="ttdef"><b>Definition:</b> <a href="a00512_source.html#l00035">data_format_hdlc.h:35</a></div></div> 58<div class="ttc" id="a00512_html"><div class="ttname"><a href="a00512.html">data_format_hdlc.h</a></div><div class="ttdoc">The data_format_hdlc.h file contains the Host interface definitions and configuration. </div></div> 59<div class="ttc" id="a02927_html_a000f6e2acab93210fdd84fa0709c95ca"><div class="ttname"><a href="a02927.html#a000f6e2acab93210fdd84fa0709c95ca">host_rx_packet_t::mIndex</a></div><div class="ttdeci">uint8_t mIndex</div><div class="ttdef"><b>Definition:</b> <a href="a00101_source.html#l00052">host_io_uart.h:52</a></div></div> 60<div class="ttc" id="a02927_html_a5e3ddc14966666f4daa793c9c4f13810"><div class="ttname"><a href="a02927.html#a5e3ddc14966666f4daa793c9c4f13810">host_rx_packet_t::rxState</a></div><div class="ttdeci">uint8_t rxState</div><div class="ttdef"><b>Definition:</b> <a href="a00101_source.html#l00051">host_io_uart.h:51</a></div></div> 61</div><!-- fragment --></div><!-- contents --> 62 63<hr class="footer"/><address class="footer"><small> 64© Copyright 2016-2022 NXP. 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