Symbian3/Examples/guid-6013a680-57f9-415b-8851-c4fa63356636/uncompress_8c_source.html
Week 32 contribution of PDK documentation content. See release notes for details. Fixes bug Bug 3582
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<h1>examples/PIPS/openclibz/src/uncompress.c</h1><a href="uncompress_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span>
<a name="l00002"></a>00002 <span class="comment">* ==============================================================================</span>
<a name="l00003"></a>00003 <span class="comment">* Name : UnCompress.c</span>
<a name="l00004"></a>00004 <span class="comment">* Part of : OpenCLibz</span>
<a name="l00005"></a>00005 <span class="comment">* Interface :</span>
<a name="l00006"></a>00006 <span class="comment">* Description :</span>
<a name="l00007"></a>00007 <span class="comment">* Version :</span>
<a name="l00008"></a>00008 <span class="comment">*</span>
<a name="l00009"></a>00009 <span class="comment">* Copyright (c) 2007 Nokia Corporation.</span>
<a name="l00010"></a>00010 <span class="comment">* This material, including documentation and any related</span>
<a name="l00011"></a>00011 <span class="comment">* computer programs, is protected by copyright controlled by</span>
<a name="l00012"></a>00012 <span class="comment">* Nokia Corporation.</span>
<a name="l00013"></a>00013 <span class="comment">* ==============================================================================</span>
<a name="l00014"></a>00014 <span class="comment">*/</span>
<a name="l00015"></a>00015
<a name="l00016"></a>00016
<a name="l00021"></a>00021 <span class="preprocessor">#include "<a class="code" href="openclibzheader_8h.html">OpenCLibzheader.h</a>"</span>
<a name="l00022"></a>00022
<a name="l00023"></a>00023 <span class="comment">//</span>
<a name="l00024"></a>00024 <span class="comment">// In case of any error , display the error message .</span>
<a name="l00025"></a>00025 <span class="comment">//</span>
<a name="l00026"></a>00026 <span class="keywordtype">void</span> Error(<span class="keyword">const</span> <span class="keywordtype">char</span> * msg)
<a name="l00027"></a>00027 {
<a name="l00028"></a>00028 printf( <span class="stringliteral">" %s\n"</span>, msg);
<a name="l00029"></a>00029 getchar();
<a name="l00030"></a>00030 getchar();
<a name="l00031"></a>00031 exit(1);
<a name="l00032"></a>00032 }
<a name="l00033"></a>00033
<a name="l00034"></a>00034
<a name="l00035"></a>00035
<a name="l00036"></a>00036 <span class="comment">//Compresses the file using libz api's</span>
<a name="l00037"></a>00037
<a name="l00038"></a>00038 <span class="keywordtype">void</span> GzUnCompress(gzFile in, FILE * out)
<a name="l00039"></a>00039
<a name="l00040"></a>00040 {
<a name="l00041"></a>00041 <span class="keyword">static</span> <span class="keywordtype">char</span> buf[BUFLEN];
<a name="l00042"></a>00042 <span class="keywordtype">int</span> len;
<a name="l00043"></a>00043 <span class="keywordtype">int</span> err;
<a name="l00044"></a>00044
<a name="l00045"></a>00045 <span class="keywordflow">for</span> (;;)
<a name="l00046"></a>00046 {
<a name="l00047"></a>00047 len = gzread(in, buf, <span class="keyword">sizeof</span>(buf)); <span class="comment">//libz api to read a compressed file</span>
<a name="l00048"></a>00048 <span class="keywordflow">if</span> (len < 0) Error (gzerror(in, &err));
<a name="l00049"></a>00049 <span class="keywordflow">if</span> (len == 0) <span class="keywordflow">break</span>;
<a name="l00050"></a>00050
<a name="l00051"></a>00051 <span class="keywordflow">if</span> ((<span class="keywordtype">int</span>)fwrite(buf, 1, (<span class="keywordtype">unsigned</span>)len, out) != len)
<a name="l00052"></a>00052 {
<a name="l00053"></a>00053 Error(<span class="stringliteral">"failed fwrite"</span>);
<a name="l00054"></a>00054 }
<a name="l00055"></a>00055 }
<a name="l00056"></a>00056 <span class="keywordflow">if</span> (fclose(out)) Error(<span class="stringliteral">"failed fclose"</span>);
<a name="l00057"></a>00057
<a name="l00058"></a>00058 <span class="keywordflow">if</span> (gzclose(in) != Z_OK) <span class="comment">// libz api to close a compressed file</span>
<a name="l00059"></a>00059
<a name="l00060"></a>00060 Error(<span class="stringliteral">"failed gzclose"</span>);
<a name="l00061"></a>00061
<a name="l00062"></a>00062
<a name="l00063"></a>00063
<a name="l00064"></a>00064 }
<a name="l00065"></a>00065
<a name="l00066"></a>00066
<a name="l00067"></a>00067
<a name="l00068"></a>00068
<a name="l00069"></a>00069 <span class="comment">//UnCompresses the file using libz api's</span>
<a name="l00070"></a>00070
<a name="l00071"></a>00071 <span class="keywordtype">void</span> FileUnCompress( <span class="keywordtype">char</span> * file )
<a name="l00072"></a>00072
<a name="l00073"></a>00073 {
<a name="l00074"></a>00074 <span class="keyword">static</span> <span class="keywordtype">char</span> buf[MAX_NAME_LEN];
<a name="l00075"></a>00075 <span class="keywordtype">char</span> *infile, *outfile;
<a name="l00076"></a>00076 FILE *out;
<a name="l00077"></a>00077 gzFile in;
<a name="l00078"></a>00078 <span class="keywordtype">char</span> choice[3];
<a name="l00079"></a>00079 uInt len = (uInt)strlen(file);
<a name="l00080"></a>00080 strcpy(buf, file);
<a name="l00081"></a>00081
<a name="l00082"></a>00082 <span class="keywordflow">if</span> (len > SUFFIX_LEN && strcmp(file+len-SUFFIX_LEN, GZ_SUFFIX) == 0)
<a name="l00083"></a>00083 {
<a name="l00084"></a>00084 infile = file;
<a name="l00085"></a>00085 outfile = buf;
<a name="l00086"></a>00086 outfile[len-3] = <span class="charliteral">'\0'</span>; <span class="comment">//create the output filename</span>
<a name="l00087"></a>00087 }
<a name="l00088"></a>00088 <span class="keywordflow">else</span>
<a name="l00089"></a>00089 {
<a name="l00090"></a>00090 outfile = file;
<a name="l00091"></a>00091 infile = buf;
<a name="l00092"></a>00092 strcat(infile, GZ_SUFFIX); <span class="comment">//create the input filename</span>
<a name="l00093"></a>00093 }
<a name="l00094"></a>00094 in = gzopen(infile, <span class="stringliteral">"rb"</span>); <span class="comment">// libz api to open a compressed file</span>
<a name="l00095"></a>00095
<a name="l00096"></a>00096 <span class="keywordflow">if</span> (in == NULL)
<a name="l00097"></a>00097 {
<a name="l00098"></a>00098
<a name="l00099"></a>00099 Error(<span class="stringliteral">"file not found ...try again \n"</span>);
<a name="l00100"></a>00100
<a name="l00101"></a>00101 }
<a name="l00102"></a>00102 out = fopen(outfile, <span class="stringliteral">"wb"</span>); <span class="comment">//open the output filename</span>
<a name="l00103"></a>00103 <span class="keywordflow">if</span> (out == NULL)
<a name="l00104"></a>00104 {
<a name="l00105"></a>00105 gzclose(in); <span class="comment">// libz api to close a compressed file</span>
<a name="l00106"></a>00106 }
<a name="l00107"></a>00107
<a name="l00108"></a>00108 GzUnCompress(in, out);
<a name="l00109"></a>00109
<a name="l00110"></a>00110 printf(<span class="stringliteral">"do you want to delete the original file (y /n) \n"</span>);
<a name="l00111"></a>00111
<a name="l00112"></a>00112 scanf(<span class="stringliteral">"%s"</span>,choice);
<a name="l00113"></a>00113
<a name="l00114"></a>00114 <span class="keywordflow">if</span>(choice[0] == <span class="charliteral">'y'</span>)
<a name="l00115"></a>00115 unlink(file);
<a name="l00116"></a>00116 printf(<span class="stringliteral">" Congrats .... uncompression done ...u can find uncompressed file in the same directory as of the source file\n"</span>);
<a name="l00117"></a>00117
<a name="l00118"></a>00118 }
<a name="l00119"></a>00119
<a name="l00120"></a>00120 <span class="comment">/* End of File */</span>
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