Symbian3/Examples/guid-6013a680-57f9-415b-8851-c4fa63356636/compress_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/compress.c</h1><a href="compress_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 : Compress.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="l00017"></a>00017
<a name="l00026"></a>00026 <span class="preprocessor">#include "<a class="code" href="openclibzheader_8h.html">OpenCLibzheader.h</a>"</span>
<a name="l00027"></a>00027 <span class="preprocessor">#include <limits.h></span>
<a name="l00028"></a>00028
<a name="l00029"></a>00029 <span class="comment">//</span>
<a name="l00030"></a>00030 <span class="comment">// GzCompress</span>
<a name="l00031"></a>00031 <span class="comment">// Compress the input file "in" and generates "out" file</span>
<a name="l00032"></a>00032 <span class="comment">//</span>
<a name="l00033"></a>00033 <span class="keywordtype">void</span> GzCompress(FILE *in,gzFile out)
<a name="l00034"></a>00034 {
<a name="l00035"></a>00035 <span class="keyword">static</span> <span class="keywordtype">char</span> buf[BUFLEN];
<a name="l00036"></a>00036 <span class="keywordtype">int</span> len;
<a name="l00037"></a>00037
<a name="l00038"></a>00038
<a name="l00039"></a>00039 <span class="preprocessor">#ifdef USE_MMAP</span>
<a name="l00040"></a>00040 <span class="preprocessor"></span> <span class="comment">/* Try first compressing with mmap. If mmap fails </span>
<a name="l00041"></a>00041 <span class="comment"> use the normal fread loop.</span>
<a name="l00042"></a>00042 <span class="comment"> */</span>
<a name="l00043"></a>00043 <span class="keywordflow">if</span> (GzCompressMmap(in, out) == Z_OK) <span class="keywordflow">return</span>;
<a name="l00044"></a>00044 <span class="preprocessor">#endif</span>
<a name="l00045"></a>00045 <span class="preprocessor"></span> <span class="keywordflow">for</span> (;;)
<a name="l00046"></a>00046 {
<a name="l00047"></a>00047 len = (int)fread(buf, 1, <span class="keyword">sizeof</span>(buf), in);
<a name="l00048"></a>00048 <span class="keywordflow">if</span> (len < 0)
<a name="l00049"></a>00049 Error(<span class="stringliteral">"error reading the file \n"</span>);
<a name="l00050"></a>00050
<a name="l00051"></a>00051 <span class="keywordflow">if</span> (len == 0) <span class="keywordflow">break</span>;
<a name="l00052"></a>00052
<a name="l00053"></a>00053 <span class="keywordflow">if</span> (gzwrite(out, buf, (<span class="keywordtype">unsigned</span>)len) != len)
<a name="l00054"></a>00054 Error(<span class="stringliteral">"error writing to the file \n"</span>);;
<a name="l00055"></a>00055
<a name="l00056"></a>00056 }
<a name="l00057"></a>00057 fclose(in);
<a name="l00058"></a>00058
<a name="l00059"></a>00059 <span class="keywordflow">if</span> (gzclose(out) != Z_OK) <span class="comment">// libz api to close a compressed file </span>
<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 <span class="preprocessor">#ifdef USE_MMAP </span>
<a name="l00069"></a>00069 <span class="preprocessor"></span>
<a name="l00070"></a>00070 <span class="comment">//</span>
<a name="l00071"></a>00071 <span class="comment">// GzCompressMmap</span>
<a name="l00072"></a>00072 <span class="comment">// Try compressing the input file at once using mmap. Return Z_OK </span>
<a name="l00073"></a>00073 <span class="comment">// If success, otherwise it returns Z_ERRNO .</span>
<a name="l00074"></a>00074 <span class="comment">// </span>
<a name="l00075"></a>00075 <span class="keywordtype">int</span> GzCompressMmap(FILE * in,gzFile out)
<a name="l00076"></a>00076 {
<a name="l00077"></a>00077 <span class="keywordtype">int</span> len;
<a name="l00078"></a>00078 <span class="keywordtype">int</span> err;
<a name="l00079"></a>00079 <span class="keywordtype">int</span> ifd = fileno(in);
<a name="l00080"></a>00080 caddr_t buf; <span class="comment">/* mmap'ed buffer for the entire input file */</span>
<a name="l00081"></a>00081 off_t buf_len; <span class="comment">/* length of the input file */</span>
<a name="l00082"></a>00082 <span class="keyword">struct </span>stat sb;
<a name="l00083"></a>00083
<a name="l00084"></a>00084 <span class="comment">/* Determine the size of the file, needed for mmap: */</span>
<a name="l00085"></a>00085
<a name="l00086"></a>00086 <span class="keywordflow">if</span> (fstat(ifd, &sb) < 0)
<a name="l00087"></a>00087 <span class="keywordflow">return</span> Z_ERRNO;
<a name="l00088"></a>00088
<a name="l00089"></a>00089 buf_len = sb.st_size;
<a name="l00090"></a>00090
<a name="l00091"></a>00091 <span class="keywordflow">if</span> (buf_len <= 0)
<a name="l00092"></a>00092 <span class="keywordflow">return</span> Z_ERRNO;
<a name="l00093"></a>00093
<a name="l00094"></a>00094 <span class="comment">/* Now do the actual mmap: */</span>
<a name="l00095"></a>00095
<a name="l00096"></a>00096 buf =(<span class="keywordtype">char</span>*) mmap((caddr_t) 0, buf_len, PROT_READ, MAP_SHARED, ifd, (off_t)0);
<a name="l00097"></a>00097
<a name="l00098"></a>00098 <span class="comment">//mmap is an openc api </span>
<a name="l00099"></a>00099
<a name="l00100"></a>00100 <span class="keywordflow">if</span> (buf == (caddr_t)(-1))
<a name="l00101"></a>00101 <span class="keywordflow">return</span> Z_ERRNO;
<a name="l00102"></a>00102
<a name="l00103"></a>00103 <span class="comment">/* Compress the whole file at once: */</span>
<a name="l00104"></a>00104 len = gzwrite(out, (<span class="keywordtype">char</span> *)buf, (<span class="keywordtype">unsigned</span>)buf_len);
<a name="l00105"></a>00105
<a name="l00106"></a>00106 <span class="keywordflow">if</span> (len != (<span class="keywordtype">int</span>)buf_len)
<a name="l00107"></a>00107 Error(gzerror(out, &err));
<a name="l00108"></a>00108
<a name="l00109"></a>00109 munmap(buf, buf_len);
<a name="l00110"></a>00110 fclose(in);
<a name="l00111"></a>00111 <span class="keywordflow">if</span> (gzclose(out) != Z_OK) <span class="comment">// libz api to close a compressed file </span>
<a name="l00112"></a>00112 Error(<span class="stringliteral">"failed gzclose"</span>);
<a name="l00113"></a>00113
<a name="l00114"></a>00114 <span class="keywordflow">return</span> Z_OK;
<a name="l00115"></a>00115 }
<a name="l00116"></a>00116 <span class="preprocessor">#endif </span><span class="comment">/* USE_MMAP */</span>
<a name="l00117"></a>00117
<a name="l00118"></a>00118
<a name="l00119"></a>00119
<a name="l00120"></a>00120
<a name="l00121"></a>00121
<a name="l00122"></a>00122 <span class="comment">//</span>
<a name="l00123"></a>00123 <span class="comment">// -----------------------------------------------------------------------------</span>
<a name="l00124"></a>00124 <span class="comment">// FileCompress</span>
<a name="l00125"></a>00125 <span class="comment">// Compresses the file using mode value</span>
<a name="l00126"></a>00126 <span class="comment">// -----------------------------------------------------------------------------</span>
<a name="l00127"></a>00127 <span class="comment">//</span>
<a name="l00128"></a>00128 <span class="keywordtype">void</span> FileCompress(<span class="keywordtype">char</span> * file,<span class="keywordtype">char</span> * mode)
<a name="l00129"></a>00129 {
<a name="l00130"></a>00130 <span class="keyword">static</span> <span class="keywordtype">char</span> outfile[MAX_NAME_LEN];
<a name="l00131"></a>00131 FILE *in;
<a name="l00132"></a>00132 gzFile out;
<a name="l00133"></a>00133 <span class="keywordtype">char</span> choice[3];
<a name="l00134"></a>00134
<a name="l00135"></a>00135 strcpy(outfile, file);
<a name="l00136"></a>00136 strcat(outfile, GZ_SUFFIX);
<a name="l00137"></a>00137
<a name="l00138"></a>00138 in = fopen(file, <span class="stringliteral">"rb"</span>);
<a name="l00139"></a>00139 <span class="keywordflow">if</span> (in == NULL)
<a name="l00140"></a>00140 {
<a name="l00141"></a>00141 Error(<span class="stringliteral">"file not found ...try again \n"</span>);
<a name="l00142"></a>00142 }
<a name="l00143"></a>00143 out = gzopen(outfile, mode);
<a name="l00144"></a>00144 <span class="keywordflow">if</span> (out == NULL)
<a name="l00145"></a>00145 {
<a name="l00146"></a>00146 Error(<span class="stringliteral">"error opening outfile\n "</span>);
<a name="l00147"></a>00147 }
<a name="l00148"></a>00148 GzCompress(in, out);
<a name="l00149"></a>00149
<a name="l00150"></a>00150
<a name="l00151"></a>00151 printf(<span class="stringliteral">"do you want to delete the original file (y /n) \n"</span>);
<a name="l00152"></a>00152
<a name="l00153"></a>00153 scanf(<span class="stringliteral">"%s"</span>,choice);
<a name="l00154"></a>00154 <span class="comment">/*I am using scanf("%s",...) because of some problem in getchar() as </span>
<a name="l00155"></a>00155 <span class="comment"> well as scanf("%c"...) . I have reported the bug */</span>
<a name="l00156"></a>00156
<a name="l00157"></a>00157 <span class="keywordflow">if</span>(choice[0] == <span class="charliteral">'y'</span>)
<a name="l00158"></a>00158 unlink(file);
<a name="l00159"></a>00159
<a name="l00160"></a>00160 printf(<span class="stringliteral">" Congrats .... compression done ...u can find .gz file in the same directory as of the source file\n"</span>);
<a name="l00161"></a>00161 }
<a name="l00162"></a>00162
<a name="l00163"></a>00163 <span class="comment">//</span>
<a name="l00164"></a>00164 <span class="comment">// -----------------------------------------------------------------------------</span>
<a name="l00165"></a>00165 <span class="comment">// StringCompress</span>
<a name="l00166"></a>00166 <span class="comment">// Compresses the string</span>
<a name="l00167"></a>00167 <span class="comment">// This function compresses the string entered by the user and shows the</span>
<a name="l00168"></a>00168 <span class="comment">// compressed string and then decompressess it </span>
<a name="l00169"></a>00169 <span class="comment">// Actually This function will show the content on the screen and demonstarte </span>
<a name="l00170"></a>00170 <span class="comment">// how strings can be compressed</span>
<a name="l00171"></a>00171 <span class="comment">// -----------------------------------------------------------------------------</span>
<a name="l00172"></a>00172 <span class="comment">//</span>
<a name="l00173"></a>00173
<a name="l00174"></a><a class="code" href="compress_8c.html#ac31e38792dbbfc5e26d9dbccb33efe3d">00174</a> <span class="keywordtype">void</span> <a class="code" href="openclibzheader_8h.html#ac31e38792dbbfc5e26d9dbccb33efe3d">StringCompress</a>()
<a name="l00175"></a>00175 {
<a name="l00176"></a>00176 Byte *compr, *uncompr;
<a name="l00177"></a>00177 uLong len,comprLen,uncomprLen;
<a name="l00178"></a>00178 <span class="keywordtype">char</span> *hello;
<a name="l00179"></a>00179
<a name="l00180"></a>00180 hello = (<span class="keywordtype">char</span> *)malloc(100*<span class="keyword">sizeof</span>(<span class="keywordtype">char</span>));
<a name="l00181"></a>00181
<a name="l00182"></a>00182 printf(<span class="stringliteral">"enter the string(maximum 100 characters) to compress....\n"</span>);
<a name="l00183"></a>00183
<a name="l00184"></a>00184
<a name="l00185"></a>00185
<a name="l00186"></a>00186 scanf(<span class="stringliteral">"%s"</span>,hello); <span class="comment">//accepts the string from the user</span>
<a name="l00187"></a>00187 len = (uLong)strlen(hello)+1;
<a name="l00188"></a>00188 comprLen = 10 * len;
<a name="l00189"></a>00189 uncomprLen = comprLen;
<a name="l00190"></a>00190
<a name="l00191"></a>00191 <span class="comment">//memory allocation</span>
<a name="l00192"></a>00192 compr = (Byte*)calloc((uInt)comprLen, 1);
<a name="l00193"></a>00193 uncompr = (Byte*)calloc((uInt)uncomprLen, 1);
<a name="l00194"></a>00194
<a name="l00195"></a>00195
<a name="l00196"></a>00196
<a name="l00197"></a>00197 <span class="comment">//compress is one of the api of libz library used to compress data</span>
<a name="l00198"></a>00198
<a name="l00199"></a>00199 compress(compr, &comprLen, (<span class="keyword">const</span> Bytef*)hello, len);
<a name="l00200"></a>00200
<a name="l00201"></a>00201 strcpy((<span class="keywordtype">char</span>*)uncompr, <span class="stringliteral">"garbage"</span>); <span class="comment">//initialization</span>
<a name="l00202"></a>00202
<a name="l00203"></a>00203 printf(<span class="stringliteral">"compressed string is : %s\n\n"</span>, (<span class="keywordtype">char</span> *)compr);
<a name="l00204"></a>00204
<a name="l00205"></a>00205 <span class="comment">//uncompress is one of the api of libz library used to uncompress data</span>
<a name="l00206"></a>00206
<a name="l00207"></a>00207 uncompress(uncompr, &uncomprLen, compr, comprLen);
<a name="l00208"></a>00208
<a name="l00209"></a>00209
<a name="l00210"></a>00210 printf(<span class="stringliteral">"press enter to uncompress it\n"</span>);
<a name="l00211"></a>00211
<a name="l00212"></a>00212 getchar();
<a name="l00213"></a>00213 getchar();
<a name="l00214"></a>00214
<a name="l00215"></a>00215 <span class="keywordflow">if</span> (strcmp((<span class="keywordtype">char</span>*)uncompr, hello))
<a name="l00216"></a>00216 {
<a name="l00217"></a>00217 Error(<span class="stringliteral">"bad uncompress\n"</span>);
<a name="l00218"></a>00218 free(compr);
<a name="l00219"></a>00219 free(uncompr);
<a name="l00220"></a>00220 }
<a name="l00221"></a>00221 <span class="keywordflow">else</span>
<a name="l00222"></a>00222 {
<a name="l00223"></a>00223 printf(<span class="stringliteral">"uncompressed string is : %s\n"</span>, (<span class="keywordtype">char</span> *)uncompr);
<a name="l00224"></a>00224 free(compr);
<a name="l00225"></a>00225 free(uncompr);
<a name="l00226"></a>00226 }
<a name="l00227"></a>00227
<a name="l00228"></a>00228 }
<a name="l00229"></a>00229
<a name="l00230"></a>00230 <span class="comment">/* End of File */</span>
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