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5 <title>TB9.2 Example Applications: examples/PIPS/openclibz/src/compress.c Source File</title> |
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11 <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> |
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12 <a name="l00002"></a>00002 <span class="comment">* ==============================================================================</span> |
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13 <a name="l00003"></a>00003 <span class="comment">* Name : Compress.c</span> |
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14 <a name="l00004"></a>00004 <span class="comment">* Part of : OpenCLibz</span> |
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15 <a name="l00005"></a>00005 <span class="comment">* Interface : </span> |
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16 <a name="l00006"></a>00006 <span class="comment">* Description : </span> |
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17 <a name="l00007"></a>00007 <span class="comment">* Version : </span> |
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18 <a name="l00008"></a>00008 <span class="comment">*</span> |
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19 <a name="l00009"></a>00009 <span class="comment">* Copyright (c) 2007 Nokia Corporation.</span> |
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20 <a name="l00010"></a>00010 <span class="comment">* This material, including documentation and any related </span> |
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21 <a name="l00011"></a>00011 <span class="comment">* computer programs, is protected by copyright controlled by </span> |
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22 <a name="l00012"></a>00012 <span class="comment">* Nokia Corporation.</span> |
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23 <a name="l00013"></a>00013 <span class="comment">* ==============================================================================</span> |
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24 <a name="l00014"></a>00014 <span class="comment">*/</span> |
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25 <a name="l00015"></a>00015 |
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26 <a name="l00016"></a>00016 |
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27 <a name="l00017"></a>00017 |
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28 <a name="l00026"></a>00026 <span class="preprocessor">#include "<a class="code" href="openclibzheader_8h.html">OpenCLibzheader.h</a>"</span> |
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29 <a name="l00027"></a>00027 <span class="preprocessor">#include <limits.h></span> |
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30 <a name="l00028"></a>00028 |
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31 <a name="l00029"></a>00029 <span class="comment">//</span> |
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32 <a name="l00030"></a>00030 <span class="comment">// GzCompress</span> |
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33 <a name="l00031"></a>00031 <span class="comment">// Compress the input file "in" and generates "out" file</span> |
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34 <a name="l00032"></a>00032 <span class="comment">//</span> |
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35 <a name="l00033"></a>00033 <span class="keywordtype">void</span> GzCompress(FILE *in,gzFile out) |
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36 <a name="l00034"></a>00034 { |
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37 <a name="l00035"></a>00035 <span class="keyword">static</span> <span class="keywordtype">char</span> buf[BUFLEN]; |
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38 <a name="l00036"></a>00036 <span class="keywordtype">int</span> len; |
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39 <a name="l00037"></a>00037 |
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40 <a name="l00038"></a>00038 |
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41 <a name="l00039"></a>00039 <span class="preprocessor">#ifdef USE_MMAP</span> |
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42 <a name="l00040"></a>00040 <span class="preprocessor"></span> <span class="comment">/* Try first compressing with mmap. If mmap fails </span> |
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43 <a name="l00041"></a>00041 <span class="comment"> use the normal fread loop.</span> |
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44 <a name="l00042"></a>00042 <span class="comment"> */</span> |
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45 <a name="l00043"></a>00043 <span class="keywordflow">if</span> (GzCompressMmap(in, out) == Z_OK) <span class="keywordflow">return</span>; |
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46 <a name="l00044"></a>00044 <span class="preprocessor">#endif</span> |
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47 <a name="l00045"></a>00045 <span class="preprocessor"></span> <span class="keywordflow">for</span> (;;) |
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48 <a name="l00046"></a>00046 { |
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49 <a name="l00047"></a>00047 len = (int)fread(buf, 1, <span class="keyword">sizeof</span>(buf), in); |
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50 <a name="l00048"></a>00048 <span class="keywordflow">if</span> (len < 0) |
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51 <a name="l00049"></a>00049 Error(<span class="stringliteral">"error reading the file \n"</span>); |
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52 <a name="l00050"></a>00050 |
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53 <a name="l00051"></a>00051 <span class="keywordflow">if</span> (len == 0) <span class="keywordflow">break</span>; |
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54 <a name="l00052"></a>00052 |
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55 <a name="l00053"></a>00053 <span class="keywordflow">if</span> (gzwrite(out, buf, (<span class="keywordtype">unsigned</span>)len) != len) |
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56 <a name="l00054"></a>00054 Error(<span class="stringliteral">"error writing to the file \n"</span>);; |
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57 <a name="l00055"></a>00055 |
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58 <a name="l00056"></a>00056 } |
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59 <a name="l00057"></a>00057 fclose(in); |
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60 <a name="l00058"></a>00058 |
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61 <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> |
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62 <a name="l00060"></a>00060 Error(<span class="stringliteral">"failed gzclose"</span>); |
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63 <a name="l00061"></a>00061 } |
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64 <a name="l00062"></a>00062 |
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65 <a name="l00063"></a>00063 |
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66 <a name="l00064"></a>00064 |
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67 <a name="l00065"></a>00065 |
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68 <a name="l00066"></a>00066 |
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69 <a name="l00067"></a>00067 |
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70 <a name="l00068"></a>00068 <span class="preprocessor">#ifdef USE_MMAP </span> |
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71 <a name="l00069"></a>00069 <span class="preprocessor"></span> |
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72 <a name="l00070"></a>00070 <span class="comment">//</span> |
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73 <a name="l00071"></a>00071 <span class="comment">// GzCompressMmap</span> |
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74 <a name="l00072"></a>00072 <span class="comment">// Try compressing the input file at once using mmap. Return Z_OK </span> |
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75 <a name="l00073"></a>00073 <span class="comment">// If success, otherwise it returns Z_ERRNO .</span> |
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76 <a name="l00074"></a>00074 <span class="comment">// </span> |
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77 <a name="l00075"></a>00075 <span class="keywordtype">int</span> GzCompressMmap(FILE * in,gzFile out) |
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78 <a name="l00076"></a>00076 { |
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79 <a name="l00077"></a>00077 <span class="keywordtype">int</span> len; |
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80 <a name="l00078"></a>00078 <span class="keywordtype">int</span> err; |
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81 <a name="l00079"></a>00079 <span class="keywordtype">int</span> ifd = fileno(in); |
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82 <a name="l00080"></a>00080 caddr_t buf; <span class="comment">/* mmap'ed buffer for the entire input file */</span> |
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83 <a name="l00081"></a>00081 off_t buf_len; <span class="comment">/* length of the input file */</span> |
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84 <a name="l00082"></a>00082 <span class="keyword">struct </span>stat sb; |
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85 <a name="l00083"></a>00083 |
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86 <a name="l00084"></a>00084 <span class="comment">/* Determine the size of the file, needed for mmap: */</span> |
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87 <a name="l00085"></a>00085 |
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88 <a name="l00086"></a>00086 <span class="keywordflow">if</span> (fstat(ifd, &sb) < 0) |
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89 <a name="l00087"></a>00087 <span class="keywordflow">return</span> Z_ERRNO; |
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90 <a name="l00088"></a>00088 |
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91 <a name="l00089"></a>00089 buf_len = sb.st_size; |
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92 <a name="l00090"></a>00090 |
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93 <a name="l00091"></a>00091 <span class="keywordflow">if</span> (buf_len <= 0) |
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94 <a name="l00092"></a>00092 <span class="keywordflow">return</span> Z_ERRNO; |
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95 <a name="l00093"></a>00093 |
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96 <a name="l00094"></a>00094 <span class="comment">/* Now do the actual mmap: */</span> |
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97 <a name="l00095"></a>00095 |
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98 <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); |
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99 <a name="l00097"></a>00097 |
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100 <a name="l00098"></a>00098 <span class="comment">//mmap is an openc api </span> |
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101 <a name="l00099"></a>00099 |
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102 <a name="l00100"></a>00100 <span class="keywordflow">if</span> (buf == (caddr_t)(-1)) |
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103 <a name="l00101"></a>00101 <span class="keywordflow">return</span> Z_ERRNO; |
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104 <a name="l00102"></a>00102 |
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105 <a name="l00103"></a>00103 <span class="comment">/* Compress the whole file at once: */</span> |
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106 <a name="l00104"></a>00104 len = gzwrite(out, (<span class="keywordtype">char</span> *)buf, (<span class="keywordtype">unsigned</span>)buf_len); |
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107 <a name="l00105"></a>00105 |
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108 <a name="l00106"></a>00106 <span class="keywordflow">if</span> (len != (<span class="keywordtype">int</span>)buf_len) |
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109 <a name="l00107"></a>00107 Error(gzerror(out, &err)); |
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110 <a name="l00108"></a>00108 |
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111 <a name="l00109"></a>00109 munmap(buf, buf_len); |
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112 <a name="l00110"></a>00110 fclose(in); |
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113 <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> |
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114 <a name="l00112"></a>00112 Error(<span class="stringliteral">"failed gzclose"</span>); |
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115 <a name="l00113"></a>00113 |
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116 <a name="l00114"></a>00114 <span class="keywordflow">return</span> Z_OK; |
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117 <a name="l00115"></a>00115 } |
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118 <a name="l00116"></a>00116 <span class="preprocessor">#endif </span><span class="comment">/* USE_MMAP */</span> |
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119 <a name="l00117"></a>00117 |
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120 <a name="l00118"></a>00118 |
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121 <a name="l00119"></a>00119 |
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122 <a name="l00120"></a>00120 |
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123 <a name="l00121"></a>00121 |
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124 <a name="l00122"></a>00122 <span class="comment">//</span> |
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125 <a name="l00123"></a>00123 <span class="comment">// -----------------------------------------------------------------------------</span> |
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126 <a name="l00124"></a>00124 <span class="comment">// FileCompress</span> |
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127 <a name="l00125"></a>00125 <span class="comment">// Compresses the file using mode value</span> |
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128 <a name="l00126"></a>00126 <span class="comment">// -----------------------------------------------------------------------------</span> |
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129 <a name="l00127"></a>00127 <span class="comment">//</span> |
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130 <a name="l00128"></a>00128 <span class="keywordtype">void</span> FileCompress(<span class="keywordtype">char</span> * file,<span class="keywordtype">char</span> * mode) |
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131 <a name="l00129"></a>00129 { |
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132 <a name="l00130"></a>00130 <span class="keyword">static</span> <span class="keywordtype">char</span> outfile[MAX_NAME_LEN]; |
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133 <a name="l00131"></a>00131 FILE *in; |
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134 <a name="l00132"></a>00132 gzFile out; |
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135 <a name="l00133"></a>00133 <span class="keywordtype">char</span> choice[3]; |
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136 <a name="l00134"></a>00134 |
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137 <a name="l00135"></a>00135 strcpy(outfile, file); |
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138 <a name="l00136"></a>00136 strcat(outfile, GZ_SUFFIX); |
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139 <a name="l00137"></a>00137 |
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140 <a name="l00138"></a>00138 in = fopen(file, <span class="stringliteral">"rb"</span>); |
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141 <a name="l00139"></a>00139 <span class="keywordflow">if</span> (in == NULL) |
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142 <a name="l00140"></a>00140 { |
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143 <a name="l00141"></a>00141 Error(<span class="stringliteral">"file not found ...try again \n"</span>); |
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144 <a name="l00142"></a>00142 } |
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145 <a name="l00143"></a>00143 out = gzopen(outfile, mode); |
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146 <a name="l00144"></a>00144 <span class="keywordflow">if</span> (out == NULL) |
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147 <a name="l00145"></a>00145 { |
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148 <a name="l00146"></a>00146 Error(<span class="stringliteral">"error opening outfile\n "</span>); |
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149 <a name="l00147"></a>00147 } |
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150 <a name="l00148"></a>00148 GzCompress(in, out); |
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151 <a name="l00149"></a>00149 |
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152 <a name="l00150"></a>00150 |
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153 <a name="l00151"></a>00151 printf(<span class="stringliteral">"do you want to delete the original file (y /n) \n"</span>); |
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154 <a name="l00152"></a>00152 |
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155 <a name="l00153"></a>00153 scanf(<span class="stringliteral">"%s"</span>,choice); |
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156 <a name="l00154"></a>00154 <span class="comment">/*I am using scanf("%s",...) because of some problem in getchar() as </span> |
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157 <a name="l00155"></a>00155 <span class="comment"> well as scanf("%c"...) . I have reported the bug */</span> |
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158 <a name="l00156"></a>00156 |
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159 <a name="l00157"></a>00157 <span class="keywordflow">if</span>(choice[0] == <span class="charliteral">'y'</span>) |
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160 <a name="l00158"></a>00158 unlink(file); |
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161 <a name="l00159"></a>00159 |
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162 <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>); |
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163 <a name="l00161"></a>00161 } |
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164 <a name="l00162"></a>00162 |
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165 <a name="l00163"></a>00163 <span class="comment">//</span> |
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166 <a name="l00164"></a>00164 <span class="comment">// -----------------------------------------------------------------------------</span> |
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167 <a name="l00165"></a>00165 <span class="comment">// StringCompress</span> |
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168 <a name="l00166"></a>00166 <span class="comment">// Compresses the string</span> |
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169 <a name="l00167"></a>00167 <span class="comment">// This function compresses the string entered by the user and shows the</span> |
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170 <a name="l00168"></a>00168 <span class="comment">// compressed string and then decompressess it </span> |
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171 <a name="l00169"></a>00169 <span class="comment">// Actually This function will show the content on the screen and demonstarte </span> |
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172 <a name="l00170"></a>00170 <span class="comment">// how strings can be compressed</span> |
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173 <a name="l00171"></a>00171 <span class="comment">// -----------------------------------------------------------------------------</span> |
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174 <a name="l00172"></a>00172 <span class="comment">//</span> |
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175 <a name="l00173"></a>00173 |
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176 <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>() |
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177 <a name="l00175"></a>00175 { |
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178 <a name="l00176"></a>00176 Byte *compr, *uncompr; |
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179 <a name="l00177"></a>00177 uLong len,comprLen,uncomprLen; |
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180 <a name="l00178"></a>00178 <span class="keywordtype">char</span> *hello; |
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181 <a name="l00179"></a>00179 |
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182 <a name="l00180"></a>00180 hello = (<span class="keywordtype">char</span> *)malloc(100*<span class="keyword">sizeof</span>(<span class="keywordtype">char</span>)); |
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183 <a name="l00181"></a>00181 |
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184 <a name="l00182"></a>00182 printf(<span class="stringliteral">"enter the string(maximum 100 characters) to compress....\n"</span>); |
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185 <a name="l00183"></a>00183 |
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186 <a name="l00184"></a>00184 |
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187 <a name="l00185"></a>00185 |
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188 <a name="l00186"></a>00186 scanf(<span class="stringliteral">"%s"</span>,hello); <span class="comment">//accepts the string from the user</span> |
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189 <a name="l00187"></a>00187 len = (uLong)strlen(hello)+1; |
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190 <a name="l00188"></a>00188 comprLen = 10 * len; |
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191 <a name="l00189"></a>00189 uncomprLen = comprLen; |
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192 <a name="l00190"></a>00190 |
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193 <a name="l00191"></a>00191 <span class="comment">//memory allocation</span> |
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194 <a name="l00192"></a>00192 compr = (Byte*)calloc((uInt)comprLen, 1); |
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195 <a name="l00193"></a>00193 uncompr = (Byte*)calloc((uInt)uncomprLen, 1); |
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196 <a name="l00194"></a>00194 |
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197 <a name="l00195"></a>00195 |
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198 <a name="l00196"></a>00196 |
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199 <a name="l00197"></a>00197 <span class="comment">//compress is one of the api of libz library used to compress data</span> |
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200 <a name="l00198"></a>00198 |
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201 <a name="l00199"></a>00199 compress(compr, &comprLen, (<span class="keyword">const</span> Bytef*)hello, len); |
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202 <a name="l00200"></a>00200 |
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203 <a name="l00201"></a>00201 strcpy((<span class="keywordtype">char</span>*)uncompr, <span class="stringliteral">"garbage"</span>); <span class="comment">//initialization</span> |
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204 <a name="l00202"></a>00202 |
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205 <a name="l00203"></a>00203 printf(<span class="stringliteral">"compressed string is : %s\n\n"</span>, (<span class="keywordtype">char</span> *)compr); |
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206 <a name="l00204"></a>00204 |
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207 <a name="l00205"></a>00205 <span class="comment">//uncompress is one of the api of libz library used to uncompress data</span> |
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208 <a name="l00206"></a>00206 |
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209 <a name="l00207"></a>00207 uncompress(uncompr, &uncomprLen, compr, comprLen); |
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210 <a name="l00208"></a>00208 |
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211 <a name="l00209"></a>00209 |
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212 <a name="l00210"></a>00210 printf(<span class="stringliteral">"press enter to uncompress it\n"</span>); |
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213 <a name="l00211"></a>00211 |
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214 <a name="l00212"></a>00212 getchar(); |
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215 <a name="l00213"></a>00213 getchar(); |
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216 <a name="l00214"></a>00214 |
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217 <a name="l00215"></a>00215 <span class="keywordflow">if</span> (strcmp((<span class="keywordtype">char</span>*)uncompr, hello)) |
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218 <a name="l00216"></a>00216 { |
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219 <a name="l00217"></a>00217 Error(<span class="stringliteral">"bad uncompress\n"</span>); |
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220 <a name="l00218"></a>00218 free(compr); |
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221 <a name="l00219"></a>00219 free(uncompr); |
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222 <a name="l00220"></a>00220 } |
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223 <a name="l00221"></a>00221 <span class="keywordflow">else</span> |
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224 <a name="l00222"></a>00222 { |
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225 <a name="l00223"></a>00223 printf(<span class="stringliteral">"uncompressed string is : %s\n"</span>, (<span class="keywordtype">char</span> *)uncompr); |
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226 <a name="l00224"></a>00224 free(compr); |
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227 <a name="l00225"></a>00225 free(uncompr); |
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228 <a name="l00226"></a>00226 } |
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229 <a name="l00227"></a>00227 |
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230 <a name="l00228"></a>00228 } |
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231 <a name="l00229"></a>00229 |
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232 <a name="l00230"></a>00230 <span class="comment">/* End of File */</span> |
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233 </pre></div></div> |
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234 <hr size="1"/><address style="text-align: right;"><small>Generated by |
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235 <a href="http://www.doxygen.org/index.html"> |
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236 <img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.6.2 </small></address> |
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237 </body> |
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238 </html> |