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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1"><title>AVR323 Interfacing GSM modems: AVRGSM_FILES/AVRGSM_zip.c Source File</title><link href="doxygen.css" rel="stylesheet" type="text/css"></head><body><!-- Generated by Doxygen 1.3.7 --><div class="qindex"><a class="qindex" href="main.html">Main Page</a> | <a class="qindex" href="annotated.html">Data Structures</a> | <a class="qindex" href="files.html">File List</a> | <a class="qindex" href="functions.html">Data Fields</a> | <a class="qindex" href="globals.html">Globals</a></div><h1>AVRGSM_FILES/AVRGSM_zip.c</h1><a href="AVRGSM__zip_8c.html">Go to the documentation of this file.</a><pre class="fragment"><div>00001 <span class="comment">// This file has been prepared for Doxygen automatic documentation generation.</span>00022 <span class="comment"></span><span class="comment">//Include</span>00023 <span class="preprocessor">#include"<a class="code" href="AVRGSM__zip_8h.html">AVRGSM_zip.h</a>"</span>00024 <a name="l00026"></a><a class="code" href="AVRGSM__zip_8c.html#a0">00026</a> <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> __flash <a class="code" href="AVRGSM__zip_8c.html#a0">hex_lookup</a>[] = <a class="code" href="AVRGSM__zip_8h.html#a2">hex_nmbr</a>; <a name="l00027"></a><a class="code" href="AVRGSM__zip_8c.html#a1">00027</a> <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> __flash <a class="code" href="AVRGSM__zip_8c.html#a1">mask</a>[7] = {1,3,7,15,31,63,127}; <a name="l00028"></a><a class="code" href="AVRGSM__zip_8c.html#a2">00028</a> <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> __flash <a class="code" href="AVRGSM__zip_8c.html#a2">power</a>[7] = {128,64,32,16,8,4,2}; 00029 00030 <a name="l00040"></a><a class="code" href="AVRGSM__zip_8h.html#a3">00040</a> <span class="keywordtype">int</span> <a class="code" href="AVRGSM__zip_8h.html#a3">ZIP_compress</a>( <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *in, <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *discarded, <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> ret[] )00041 {00042 00044 <span class="keywordtype">int</span> i,ii,iii;00045 <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> encode_c, now_c, next_c;00046 00047 <span class="comment">//Initialization</span>00048 *discarded = 0;00049 00050 <span class="keywordflow">for</span>( i = ii = iii = 0; ( in[i] != <span class="charliteral">'\0'</span> ) && ( i < <a class="code" href="AVRGSM__zip_8h.html#a1">MESSAGE_LENGTH</a> ); ) <span class="comment">//Run through whole string</span>00051 {00052 now_c = in[ i++ ]; <span class="comment">//This char</span>00053 next_c = in[ i ]; <span class="comment">//Next potentially '\0'</span>00054 00055 <span class="comment">//Last char?</span>00056 <span class="keywordflow">if</span>( next_c == <span class="charliteral">'\0'</span> )00057 {00058 next_c = 0;00059 }00060 00061 encode_c = ( now_c >> ii )+ ( <a class="code" href="AVRGSM__zip_8c.html#a1">mask</a>[ ii ] & next_c )*<a class="code" href="AVRGSM__zip_8c.html#a2">power</a>[ ii ];00062 ret[ iii++ ] = <a class="code" href="AVRGSM__zip_8c.html#a0">hex_lookup</a>[ ( encode_c >> 4 ) & 0x0F ]; <span class="comment">//Insert first hex part</span>00063 ret[ iii++ ] = <a class="code" href="AVRGSM__zip_8c.html#a0">hex_lookup</a>[ ( encode_c & 0x0F ) ]; <span class="comment">//Insert last hex part</span>00064 00065 <span class="keywordflow">if</span>( ii == 6 ) <span class="comment">//We have read a chunk of 7 chars, the next one will be discarded</span>00066 {00067 ii = 0;00068 i++;00069 (*discarded)++;00070 }00071 00072 <span class="keywordflow">else</span>00073 {00074 ii++;00075 }00076 }00077 00078 ret[iii] = <span class="charliteral">'\0'</span>;00079 00080 <span class="keywordflow">return</span> i;00081 }00082 00083 <a name="l00091"></a><a class="code" href="AVRGSM__zip_8h.html#a4">00091</a> <span class="keywordtype">int</span> <a class="code" href="AVRGSM__zip_8h.html#a4">ZIP_decompress</a>( <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *compressed, <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *decompressed )00092 {00093 00095 <span class="keywordtype">int</span> i,ii,iii; <span class="comment">//String index</span>00096 <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> rest_c, ans_c ,dec_c , this_c, next_c; <span class="comment">//Read and temorary variables</span>00097 00098 <span class="keywordflow">for</span>( i = ii = iii = rest_c = 0; (this_c = compressed[i++]) != <span class="charliteral">'\0'</span>; ) <span class="comment">//Run through complete string</span>00099 {00100 <span class="comment">//Read:</span>00101 next_c = compressed[i++]; <span class="comment">//Read from in buffer in AVR_SMS_com.c</span>00102 00103 <span class="comment">//Convert:</span>00104 dec_c = 16 * <a class="code" href="AVRGSM__zip_8h.html#a6">ZIP_htoi</a>( this_c ) + <a class="code" href="AVRGSM__zip_8h.html#a6">ZIP_htoi</a>( next_c ); <span class="comment">//Decimal value of the two chars</span>00105 ans_c = dec_c & <a class="code" href="AVRGSM__zip_8c.html#a1">mask</a>[6 - ii]; <span class="comment">//Mask out the correct bits</span>00106 ans_c <<= ii; <span class="comment">//Left shift proper correct of times</span>00107 decompressed[iii++] = ans_c + rest_c; <span class="comment">//Store</span>00108 00109 rest_c = (dec_c & ~<a class="code" href="AVRGSM__zip_8c.html#a1">mask</a>[6 - ii]) >> ( 7 - ii ); <span class="comment">//Saving up for next time</span>00110 00111 <span class="keywordflow">if</span>( ii == 6) <span class="comment">//Do carry</span>00112 {00113 ii = 0;00114 decompressed[ iii++ ] = rest_c;00115 rest_c = 0;00116 }00117 00118 <span class="keywordflow">else</span>00119 {00120 ii++;00121 }00122 00123 }00124 00125 decompressed[ iii ] = <span class="charliteral">'\0'</span>; <span class="comment">//Terminate string in a proper manner</span>00126 <span class="keywordflow">return</span> iii; <span class="comment">//Return length</span>00127 }00128 00129 <a name="l00140"></a><a class="code" href="AVRGSM__zip_8h.html#a5">00140</a> <span class="keywordtype">int</span> <a class="code" href="AVRGSM__zip_8h.html#a5">ZIP_atoi</a>( <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *a )00141 {00142 00143 <span class="keywordtype">int</span> i, n; <span class="comment">//Help variables</span>00144 00145 n = 0; <span class="comment">//Init</span>00146 00147 <span class="keywordflow">for</span>( i=0; ( a[ i ] >= <span class="charliteral">'0'</span> ) && ( a[ i ] <= <span class="charliteral">'9'</span> ); ++i ) <span class="comment">//Running through string converting from ascii to integer</span>00148 {00149 n = 10*n + ( a[ i ] - <span class="charliteral">'0'</span> ); <span class="comment">//Adding value to return Integer</span>00150 }00151 00152 <span class="keywordflow">return</span> n;00153 }00154 00155 <a name="l00164"></a><a class="code" href="AVRGSM__zip_8h.html#a6">00164</a> <span class="keywordtype">int</span> <a class="code" href="AVRGSM__zip_8h.html#a6">ZIP_htoi</a>( <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> hex )00165 {00166 00167 <span class="keywordflow">if</span>( ( hex >= <span class="charliteral">'A'</span> ) && ( hex <= <span class="charliteral">'F'</span> ) ) <span class="comment">//Test if hex is A-->F?</span>00168 {00169 <span class="keywordflow">return</span> hex - <span class="charliteral">'A'</span> + 10;00170 }00171 <span class="keywordflow">else</span> <span class="comment">//Must have something else then:0-->9</span>00172 {00173 <span class="keywordflow">return</span> hex - <span class="charliteral">'0'</span>;00174 }00175 }00176 00177 <a name="l00187"></a><a class="code" href="AVRGSM__zip_8h.html#a7">00187</a> <span class="keywordtype">void</span> <a class="code" href="AVRGSM__zip_8h.html#a7">ZIP_itoh</a>( <span class="keywordtype">int</span> n, <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *ret )00188 {00189 00190 ret[ 0 ] = <a class="code" href="AVRGSM__zip_8c.html#a0">hex_lookup</a>[ ( n >> 4 ) & 0x0F ];00191 ret[ 1 ] = <a class="code" href="AVRGSM__zip_8c.html#a0">hex_lookup</a>[ ( n & 0x0F ) ];00192 ret[ 2 ] = <span class="charliteral">'\0'</span>;00193 }</div></pre><hr size="1"><address style="align: right;"><small>Generated on Tue Nov 1 16:21:39 2005 for AVR323 Interfacing GSM modems by<a href="http://www.doxygen.org/index.html"><img src="doxygen.png" alt="doxygen" align="middle" border=0 ></a> 1.3.7 </small></address></body></html>⌨️ 快捷键说明
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