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<hr><h1>utf16utf8.cpp</h1><div class="fragment"><pre>00001 <font class="comment">/******************************************************************************</font>
00002 <font class="comment"> *</font>
00003 <font class="comment"> * UTF16UTF8 - SWFilter decendant to convert UTF-16 to UTF-8</font>
00004 <font class="comment"> *</font>
00005 <font class="comment"> */</font>
00006
00007 <font class="preprocessor">#include <stdlib.h></font>
00008 <font class="preprocessor">#include <stdio.h></font>
00009
00010 <font class="preprocessor">#include <utf16utf8.h></font>
00011
00012 UTF16UTF8::UTF16UTF8() {
00013 }
00014
00015
00016 <font class="keywordtype">char</font> UTF16UTF8::ProcessText(<font class="keywordtype">char</font> *text, <font class="keywordtype">int</font> maxlen, <font class="keyword">const</font> <a class="code" href="class_s_w_key.html">SWKey</a> *key, <font class="keyword">const</font> <a class="code" href="class_s_w_module.html">SWModule</a> *module)
00017 {
00018 <font class="keywordtype">unsigned</font> <font class="keywordtype">short</font> *from;
00019 <font class="keywordtype">unsigned</font> <font class="keywordtype">char</font> *to;
00020
00021 <font class="keywordtype">int</font> len;
00022 <font class="keywordtype">unsigned</font> <font class="keywordtype">long</font> uchar;
00023 <font class="keywordtype">unsigned</font> <font class="keywordtype">short</font> schar;
00024
00025 len = 0;
00026 from = (<font class="keywordtype">unsigned</font> <font class="keywordtype">short</font>*) text;
00027 <font class="keywordflow">while</font> (*from) {
00028 len += 2;
00029 from++;
00030 }
00031
00032 <font class="comment">// shift string to right of buffer</font>
00033 <font class="keywordflow">if</font> (len < maxlen) {
00034 memmove(&text[maxlen - len], text, len);
00035 from = (<font class="keywordtype">unsigned</font> <font class="keywordtype">short</font>*)&text[maxlen - len];
00036 }
00037 <font class="keywordflow">else</font>
00038 from = (<font class="keywordtype">unsigned</font> <font class="keywordtype">short</font>*)text;
00039
00040
00041 <font class="comment">// -------------------------------</font>
00042
00043 <font class="keywordflow">for</font> (to = (<font class="keywordtype">unsigned</font> <font class="keywordtype">char</font>*)text; *from; from++) {
00044 uchar = 0;
00045
00046 <font class="keywordflow">if</font> (*from < 0xD800 || *from > 0xDFFF) {
00047 uchar = *from;
00048 }
00049 <font class="keywordflow">else</font> <font class="keywordflow">if</font> (*from >= 0xD800 && *from <= 0xDBFF) {
00050 uchar = *from;
00051 schar = *(from+1);
00052 <font class="keywordflow">if</font> (uchar < 0xDC00 || uchar > 0xDFFF) {
00053 <font class="comment">//error, do nothing</font>
00054 <font class="keywordflow">continue</font>;
00055 }
00056 uchar &= 0x03ff;
00057 schar &= 0x03ff;
00058 uchar <<= 10;
00059 uchar |= schar;
00060 uchar += 0x10000;
00061 from++;
00062 }
00063 <font class="keywordflow">else</font> {
00064 <font class="comment">//error, do nothing</font>
00065 <font class="keywordflow">continue</font>;
00066 }
00067
00068 <font class="keywordflow">if</font> (uchar < 0x80) {
00069 *to++ = uchar;
00070 }
00071 <font class="keywordflow">else</font> <font class="keywordflow">if</font> (uchar < 0x800) {
00072 *to++ = 0xc0 | (uchar >> 6);
00073 *to++ = 0x80 | (uchar & 0x3f);
00074 }
00075 <font class="keywordflow">else</font> <font class="keywordflow">if</font> (uchar < 0x10000) {
00076 *to++ = 0xe0 | (uchar >> 12);
00077 *to++ = 0x80 | (uchar >> 6) & 0x3f;
00078 *to++ = 0x80 | uchar & 0x3f;
00079 }
00080 <font class="keywordflow">else</font> <font class="keywordflow">if</font> (uchar < 0x200000) {
00081 *to++ = 0xF0 | (uchar >> 18);
00082 *to++ = 0x80 | (uchar >> 12) & 0x3F;
00083 *to++ = 0x80 | (uchar >> 6) & 0x3F;
00084 *to++ = 0x80 | uchar & 0x3F;
00085 }
00086 }
00087 *to++ = 0;
00088 *to = 0;
00089
00090 <font class="keywordflow">return</font> 0;
00091 }
00092
00093
00094
00095
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