doc/api-documentation/html/swunicod_8cpp-source.html


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<hr><h1>swunicod.cpp</h1><div class="fragment"><pre>00001 <font class="comment">/*</font>
00002 <font class="comment"> *</font>
00003 <font class="comment"> * Copyright 1998 CrossWire Bible Society (http://www.crosswire.org)</font>
00004 <font class="comment"> *      CrossWire Bible Society</font>
00005 <font class="comment"> *      P. O. Box 2528</font>
00006 <font class="comment"> *      Tempe, AZ  85280-2528</font>
00007 <font class="comment"> *</font>
00008 <font class="comment"> * This program is free software; you can redistribute it and/or modify it</font>
00009 <font class="comment"> * under the terms of the GNU General Public License as published by the</font>
00010 <font class="comment"> * Free Software Foundation version 2.</font>
00011 <font class="comment"> *</font>
00012 <font class="comment"> * This program is distributed in the hope that it will be useful, but</font>
00013 <font class="comment"> * WITHOUT ANY WARRANTY; without even the implied warranty of</font>
00014 <font class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU</font>
00015 <font class="comment"> * General Public License for more details.</font>
00016 <font class="comment"> *</font>
00017 <font class="comment"> */</font>
00018 
00019 <font class="preprocessor">#include "swunicod.h"</font>
00020 <font class="keywordtype">unsigned</font> <font class="keywordtype">char</font>* UTF32to8 (<font class="keywordtype">unsigned</font> <font class="keywordtype">long</font> utf32, <font class="keywordtype">unsigned</font> <font class="keywordtype">char</font> * utf8) {
00021   <font class="keywordtype">unsigned</font> <font class="keywordtype">int</font> i;
00022   <font class="keywordflow">for</font> (i = 0; i &lt; 6; i++) utf8[i] = 0;
00023 
00024   <font class="keywordflow">if</font> (utf32 &lt; 0x80) {
00025     utf8[0] = (char)utf32;
00026   }
00027   <font class="keywordflow">else</font> <font class="keywordflow">if</font> (utf32 &lt; 0x800) {
00028     i = utf32 &amp; 0x3f;
00029     utf8[1] = 0x80 | i;
00030     utf32 &gt;&gt;= 6;
00031    
00032     i = utf32 &amp; 0x1f;
00033     utf8[0] = 0xc0 | i;
00034   }
00035   <font class="keywordflow">else</font> <font class="keywordflow">if</font> (utf32 &lt; 0x10000) {
00036     i = utf32 &amp; 0x3f;
00037     utf8[2] = 0x80 | i;
00038     utf32 &gt;&gt;= 6;
00039 
00040     i = utf32 &amp; 0x3f;
00041     utf8[1] = 0x80 | i;
00042     utf32 &gt;&gt;= 6;
00043    
00044     i = utf32 &amp; 0x0f;
00045     utf8[0] = 0xe0 | i;
00046   }
00047   <font class="keywordflow">else</font> <font class="keywordflow">if</font> (utf32 &lt; 0x200000) {
00048     i = utf32 &amp; 0x3f;
00049     utf8[3] = 0x80 | i;
00050     utf32 &gt;&gt;= 6;
00051 
00052     i = utf32 &amp; 0x3f;
00053     utf8[2] = 0x80 | i;
00054     utf32 &gt;&gt;= 6;
00055 
00056     i = utf32 &amp; 0x3f;
00057     utf8[1] = 0x80 | i;
00058     utf32 &gt;&gt;= 6;
00059    
00060     i = utf32 &amp; 0x07;
00061     utf8[0] = 0xf0 | i;
00062   }
00063   <font class="keywordflow">else</font> <font class="keywordflow">if</font> (utf32 &lt; 0x4000000) {
00064     i = utf32 &amp; 0x3f;
00065     utf8[4] = 0x80 | i;
00066     utf32 &gt;&gt;= 6;
00067 
00068     i = utf32 &amp; 0x3f;
00069     utf8[3] = 0x80 | i;
00070     utf32 &gt;&gt;= 6;
00071 
00072     i = utf32 &amp; 0x3f;
00073     utf8[2] = 0x80 | i;
00074     utf32 &gt;&gt;= 6;
00075 
00076     i = utf32 &amp; 0x3f;
00077     utf8[1] = 0x80 | i;
00078     utf32 &gt;&gt;= 6;
00079    
00080     i = utf32 &amp; 0x03;
00081     utf8[0] = 0xf8 | i;
00082   }
00083   <font class="keywordflow">else</font> <font class="keywordflow">if</font> (utf32 &lt; 0x80000000) {
00084     i = utf32 &amp; 0x3f;
00085     utf8[5] = 0x80 | i;
00086     utf32 &gt;&gt;= 6;
00087 
00088     i = utf32 &amp; 0x3f;
00089     utf8[4] = 0x80 | i;
00090     utf32 &gt;&gt;= 6;
00091 
00092     i = utf32 &amp; 0x3f;
00093     utf8[3] = 0x80 | i;
00094     utf32 &gt;&gt;= 6;
00095 
00096     i = utf32 &amp; 0x3f;
00097     utf8[2] = 0x80 | i;
00098     utf32 &gt;&gt;= 6;
00099 
00100     i = utf32 &amp; 0x3f;
00101     utf8[1] = 0x80 | i;
00102     utf32 &gt;&gt;= 6;
00103    
00104     i = utf32 &amp; 0x01;
00105     utf8[0] = 0xfc | i;
00106   }
00107   <font class="keywordflow">return</font> utf8;
00108 }
00109 
00114 <font class="keywordtype">unsigned</font> <font class="keywordtype">long</font> UTF8to32 (<font class="keywordtype">unsigned</font> <font class="keywordtype">char</font> * utf8) {
00115 
00116   <font class="keywordtype">unsigned</font> <font class="keywordtype">char</font> i = utf8[0];
00117   <font class="keywordtype">unsigned</font> <font class="keywordtype">char</font> count;
00118   <font class="keywordtype">unsigned</font> <font class="keywordtype">long</font> utf32 = 0;
00119 
00120   <font class="keywordflow">for</font> (count = 0; i &amp; 0x80; count++) i &lt;&lt;= 1;
00121   <font class="keywordflow">if</font> (!count) {
00122     <font class="keywordflow">return</font> utf8[0];
00123   }
00124   <font class="keywordflow">else</font> <font class="keywordflow">if</font> (count == 1) {
00125     <font class="keywordflow">return</font> 0xffff;
00126   }
00127   <font class="keywordflow">else</font> {
00128     count--;
00129     utf32 = i &gt;&gt; count;
00130     <font class="keywordflow">for</font> (i = 1; i &lt;= count; i++) {
00131       <font class="keywordflow">if</font> (0xc0 &amp; utf8[i] != 0x80) {
00132         <font class="keywordflow">return</font>  0xffff;
00133       }
00134       utf32 &lt;&lt;= 6;
00135       utf32 |= (utf8[i] &amp; 0x3f);
00136     }
00137   }
00138   <font class="keywordflow">return</font> utf32;
00139 }
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