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<h1>file/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"> * Copyright (c) Ian F. Darwin 1986-1995.</span>
<a name="l00003"></a>00003 <span class="comment"> * Software written by Ian F. Darwin and others;</span>
<a name="l00004"></a>00004 <span class="comment"> * maintained 1995-present by Christos Zoulas and others.</span>
<a name="l00005"></a>00005 <span class="comment"> * </span>
<a name="l00006"></a>00006 <span class="comment"> * Redistribution and use in source and binary forms, with or without</span>
<a name="l00007"></a>00007 <span class="comment"> * modification, are permitted provided that the following conditions</span>
<a name="l00008"></a>00008 <span class="comment"> * are met:</span>
<a name="l00009"></a>00009 <span class="comment"> * 1. Redistributions of source code must retain the above copyright</span>
<a name="l00010"></a>00010 <span class="comment"> * notice immediately at the beginning of the file, without modification,</span>
<a name="l00011"></a>00011 <span class="comment"> * this list of conditions, and the following disclaimer.</span>
<a name="l00012"></a>00012 <span class="comment"> * 2. Redistributions in binary form must reproduce the above copyright</span>
<a name="l00013"></a>00013 <span class="comment"> * notice, this list of conditions and the following disclaimer in the</span>
<a name="l00014"></a>00014 <span class="comment"> * documentation and/or other materials provided with the distribution.</span>
<a name="l00015"></a>00015 <span class="comment"> * </span>
<a name="l00016"></a>00016 <span class="comment"> * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND</span>
<a name="l00017"></a>00017 <span class="comment"> * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE</span>
<a name="l00018"></a>00018 <span class="comment"> * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE</span>
<a name="l00019"></a>00019 <span class="comment"> * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR</span>
<a name="l00020"></a>00020 <span class="comment"> * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL</span>
<a name="l00021"></a>00021 <span class="comment"> * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS</span>
<a name="l00022"></a>00022 <span class="comment"> * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)</span>
<a name="l00023"></a>00023 <span class="comment"> * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT</span>
<a name="l00024"></a>00024 <span class="comment"> * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY</span>
<a name="l00025"></a>00025 <span class="comment"> * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF</span>
<a name="l00026"></a>00026 <span class="comment"> * SUCH DAMAGE.</span>
<a name="l00027"></a>00027 <span class="comment"> */</span>
<a name="l00028"></a>00028 <span class="comment">/*</span>
<a name="l00029"></a>00029 <span class="comment"> * compress routines:</span>
<a name="l00030"></a>00030 <span class="comment"> * zmagic() - returns 0 if not recognized, uncompresses and prints</span>
<a name="l00031"></a>00031 <span class="comment"> * information if recognized</span>
<a name="l00032"></a>00032 <span class="comment"> * uncompress(method, old, n, newch) - uncompress old into new, </span>
<a name="l00033"></a>00033 <span class="comment"> * using method, return sizeof new</span>
<a name="l00034"></a>00034 <span class="comment"> */</span>
<a name="l00035"></a>00035 <span class="preprocessor">#include "<a class="code" href="file_8h.html">file.h</a>"</span>
<a name="l00036"></a>00036 <span class="preprocessor">#include "magic.h"</span>
<a name="l00037"></a>00037 <span class="preprocessor">#include <stdio.h></span>
<a name="l00038"></a>00038 <span class="preprocessor">#include <stdlib.h></span>
<a name="l00039"></a>00039 <span class="preprocessor">#ifdef HAVE_UNISTD_H</span>
<a name="l00040"></a>00040 <span class="preprocessor"></span><span class="preprocessor">#include <unistd.h></span>
<a name="l00041"></a>00041 <span class="preprocessor">#endif</span>
<a name="l00042"></a>00042 <span class="preprocessor"></span><span class="preprocessor">#include <string.h></span>
<a name="l00043"></a>00043 <span class="preprocessor">#include <errno.h></span>
<a name="l00044"></a>00044 <span class="preprocessor">#include <sys/types.h></span>
<a name="l00045"></a>00045 <span class="preprocessor">#ifdef HAVE_SYS_WAIT_H</span>
<a name="l00046"></a>00046 <span class="preprocessor"></span><span class="preprocessor">#include <sys/wait.h></span>
<a name="l00047"></a>00047 <span class="preprocessor">#endif</span>
<a name="l00048"></a>00048 <span class="preprocessor"></span><span class="preprocessor">#ifdef HAVE_LIBZ</span>
<a name="l00049"></a>00049 <span class="preprocessor"></span><span class="preprocessor">#include <zlib.h></span>
<a name="l00050"></a>00050 <span class="preprocessor">#endif</span>
<a name="l00051"></a>00051 <span class="preprocessor"></span>
<a name="l00052"></a>00052 <span class="preprocessor">#ifndef lint</span>
<a name="l00053"></a><a class="code" href="compress_8c.html#d3e2f9b6d2324a17d1d4a526b01dbf40">00053</a> <span class="preprocessor"></span><a class="code" href="system_8h.html#b757e9ff04be9e1b95de08c5536ac334">FILE_RCSID</a>(<span class="stringliteral">"@(#)$Id: compress.c,v 1.42 2005/03/06 05:58:22 christos Exp $"</span>)
<a name="l00054"></a>00054 <span class="preprocessor">#endif</span>
<a name="l00055"></a>00055 <span class="preprocessor"></span>
<a name="l00056"></a>00056
<a name="l00057"></a>00057 <span class="comment">/*@-nullassign@*/</span>
<a name="l00058"></a>00058 <span class="comment">/*@unchecked@*/</span> <span class="comment">/*@observer@*/</span>
<a name="l00059"></a>00059 <span class="keyword">private</span> <span class="keyword">struct </span>{
<a name="l00060"></a>00060 <span class="comment">/*@observer@*/</span>
<a name="l00061"></a><a class="code" href="compress_8c.html#52bfb08821468413d41bc3e3b38dc078">00061</a> <span class="keyword">const</span> <span class="keywordtype">char</span> *<a class="code" href="structmagic.html">magic</a>;
<a name="l00062"></a><a class="code" href="compress_8c.html#4492d9f585cf2bd905f6dc537e6922bc">00062</a> size_t <a class="code" href="compress_8c.html#4492d9f585cf2bd905f6dc537e6922bc">maglen</a>;
<a name="l00063"></a>00063 <span class="comment">/*@observer@*/</span>
<a name="l00064"></a><a class="code" href="compress_8c.html#b233d58a2d9af13ae09ea8fd82556856">00064</a> <span class="keyword">const</span> <span class="keywordtype">char</span> *<span class="keyword">const</span> <a class="code" href="compress_8c.html#b233d58a2d9af13ae09ea8fd82556856">argv</a>[3];
<a name="l00065"></a><a class="code" href="compress_8c.html#582e2ef9670c974c00e00ad10af0e629">00065</a> <span class="keywordtype">int</span> <a class="code" href="compress_8c.html#582e2ef9670c974c00e00ad10af0e629">silent</a>;
<a name="l00066"></a>00066 } <a class="code" href="compress_8c.html#d316b129c3c168af65fa56f15c880c0a">compr</a>[] = {
<a name="l00067"></a>00067 { <span class="stringliteral">"\037\235"</span>, 2, { <span class="stringliteral">"gzip"</span>, <span class="stringliteral">"-cdq"</span>, NULL }, 1 }, <span class="comment">/* compressed */</span>
<a name="l00068"></a>00068 <span class="comment">/* Uncompress can get stuck; so use gzip first if we have it</span>
<a name="l00069"></a>00069 <span class="comment"> * Idea from Damien Clark, thanks! */</span>
<a name="l00070"></a>00070 { <span class="stringliteral">"\037\235"</span>, 2, { <span class="stringliteral">"uncompress"</span>, <span class="stringliteral">"-c"</span>, NULL }, 1 }, <span class="comment">/* compressed */</span>
<a name="l00071"></a>00071 { <span class="stringliteral">"\037\213"</span>, 2, { <span class="stringliteral">"gzip"</span>, <span class="stringliteral">"-cdq"</span>, NULL }, 1 }, <span class="comment">/* gzipped */</span>
<a name="l00072"></a>00072 { <span class="stringliteral">"\037\236"</span>, 2, { <span class="stringliteral">"gzip"</span>, <span class="stringliteral">"-cdq"</span>, NULL }, 1 }, <span class="comment">/* frozen */</span>
<a name="l00073"></a>00073 { <span class="stringliteral">"\037\240"</span>, 2, { <span class="stringliteral">"gzip"</span>, <span class="stringliteral">"-cdq"</span>, NULL }, 1 }, <span class="comment">/* SCO LZH */</span>
<a name="l00074"></a>00074 <span class="comment">/* the standard pack utilities do not accept standard input */</span>
<a name="l00075"></a>00075 { <span class="stringliteral">"\037\036"</span>, 2, { <span class="stringliteral">"gzip"</span>, <span class="stringliteral">"-cdq"</span>, NULL }, 0 }, <span class="comment">/* packed */</span>
<a name="l00076"></a>00076 { <span class="stringliteral">"PK\3\4"</span>, 4, { <span class="stringliteral">"gzip"</span>, <span class="stringliteral">"-cdq"</span>, NULL }, 1 }, <span class="comment">/* pkzipped, */</span>
<a name="l00077"></a>00077 <span class="comment">/* ...only first file examined */</span>
<a name="l00078"></a>00078 { <span class="stringliteral">"BZh"</span>, 3, { <span class="stringliteral">"bzip2"</span>, <span class="stringliteral">"-cd"</span>, NULL }, 1 }, <span class="comment">/* bzip2-ed */</span>
<a name="l00079"></a>00079 };
<a name="l00080"></a>00080 <span class="comment">/*@=nullassign@*/</span>
<a name="l00081"></a>00081
<a name="l00082"></a>00082 <span class="comment">/*@unchecked@*/</span>
<a name="l00083"></a><a class="code" href="compress_8c.html#f1f5fd4aa8164599937adf5e808910f6">00083</a> <span class="keyword">private</span> <span class="keywordtype">int</span> <a class="code" href="compress_8c.html#f1f5fd4aa8164599937adf5e808910f6">ncompr</a> = <span class="keyword">sizeof</span>(<a class="code" href="compress_8c.html#d316b129c3c168af65fa56f15c880c0a">compr</a>) / <span class="keyword">sizeof</span>(<a class="code" href="compress_8c.html#d316b129c3c168af65fa56f15c880c0a">compr</a>[0]);
<a name="l00084"></a>00084
<a name="l00085"></a>00085
<a name="l00086"></a>00086 <span class="keyword">private</span> ssize_t <a class="code" href="compress_8c.html#bb1e90a0dadf216427c52593e78f1283">swrite</a>(<span class="keywordtype">int</span> fd, <span class="keyword">const</span> <span class="keywordtype">void</span> *buf, size_t n)
<a name="l00087"></a>00087 <span class="comment">/*@*/</span>;
<a name="l00088"></a>00088 <span class="keyword">private</span> ssize_t <a class="code" href="compress_8c.html#6b08a68251c48b3e4847e43fd6174001">sread</a>(<span class="keywordtype">int</span> fd, <span class="keywordtype">void</span> *buf, size_t n)
<a name="l00089"></a>00089 <span class="comment">/*@modifies buf @*/</span>;
<a name="l00090"></a>00090 <span class="keyword">private</span> size_t <a class="code" href="compress_8c.html#27dbc40030d2439aa5de75c974b909e3">uncompressbuf</a>(<span class="keyword">struct</span> <a class="code" href="structmagic__set.html">magic_set</a> *ms, <span class="keywordtype">int</span> fd, size_t method,
<a name="l00091"></a>00091 <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *old, <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> **newch, size_t n)
<a name="l00092"></a>00092 <span class="comment">/*@globals fileSystem, internalState @*/</span>
<a name="l00093"></a>00093 <span class="comment">/*@modifies ms, *newch, fileSystem, internalState @*/</span>;
<a name="l00094"></a>00094 <span class="preprocessor">#ifdef HAVE_LIBZ</span>
<a name="l00095"></a>00095 <span class="preprocessor"></span><span class="keyword">private</span> size_t uncompressgzipped(<span class="keyword">struct</span> <a class="code" href="structmagic__set.html">magic_set</a> *ms, <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *old,
<a name="l00096"></a>00096 <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> **newch, size_t n)
<a name="l00097"></a>00097 <span class="comment">/*@modifies ms, *newch @*/</span>;
<a name="l00098"></a>00098 <span class="preprocessor">#endif</span>
<a name="l00099"></a>00099 <span class="preprocessor"></span>
<a name="l00100"></a>00100 <span class="keyword">protected</span> <span class="keywordtype">int</span>
<a name="l00101"></a><a class="code" href="file_8h.html#d1fd31b67a830faf23c44a661bd13f9b">00101</a> <a class="code" href="compress_8c.html#a2fec18b68b359e94bb72491693472c0">file_zmagic</a>(<span class="keyword">struct</span> <a class="code" href="structmagic__set.html">magic_set</a> *ms, <span class="keywordtype">int</span> fd, <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *buf,
<a name="l00102"></a>00102 size_t nbytes)
<a name="l00103"></a>00103 {
<a name="l00104"></a>00104 <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *newbuf = NULL;
<a name="l00105"></a>00105 size_t i, nsz;
<a name="l00106"></a>00106 <span class="keywordtype">int</span> rv = 0;
<a name="l00107"></a>00107
<a name="l00108"></a>00108 <span class="keywordflow">if</span> ((ms-><a class="code" href="structmagic__set.html#7677d8f81949874cf4a626d1d4566fc6">flags</a> & MAGIC_COMPRESS) == 0)
<a name="l00109"></a>00109 <span class="keywordflow">return</span> 0;
<a name="l00110"></a>00110
<a name="l00111"></a>00111 <span class="keywordflow">for</span> (i = 0; i < ncompr; i++) {
<a name="l00112"></a>00112 <span class="keywordflow">if</span> (nbytes < compr[i].<a class="code" href="compress_8c.html#4492d9f585cf2bd905f6dc537e6922bc">maglen</a>)
<a name="l00113"></a>00113 <span class="keywordflow">continue</span>;
<a name="l00114"></a>00114 <span class="keywordflow">if</span> (memcmp(buf, compr[i].<a class="code" href="structmagic.html">magic</a>, compr[i].maglen) == 0 &&
<a name="l00115"></a>00115 (nsz = <a class="code" href="compress_8c.html#27dbc40030d2439aa5de75c974b909e3">uncompressbuf</a>(ms, fd, i, buf, &newbuf,
<a name="l00116"></a>00116 nbytes)) != 0) {
<a name="l00117"></a>00117 ms-><a class="code" href="structmagic__set.html#7677d8f81949874cf4a626d1d4566fc6">flags</a> &= ~MAGIC_COMPRESS;
<a name="l00118"></a>00118 rv = -1;
<a name="l00119"></a>00119 if (<a class="code" href="file_8h.html#7573b1217f2a62bcfca3e998e45dc9fc">file_buffer</a>(ms, -1, newbuf, nsz) == -1)
<a name="l00120"></a>00120 <span class="keywordflow">goto</span> error;
<a name="l00121"></a>00121 <span class="keywordflow">if</span> (<a class="code" href="file_8h.html#949757705ada92387535cfad72f9243c">file_printf</a>(ms, <span class="stringliteral">" ("</span>) == -1)
<a name="l00122"></a>00122 <span class="keywordflow">goto</span> error;
<a name="l00123"></a>00123 <span class="keywordflow">if</span> (<a class="code" href="file_8h.html#7573b1217f2a62bcfca3e998e45dc9fc">file_buffer</a>(ms, -1, buf, nbytes) == -1)
<a name="l00124"></a>00124 <span class="keywordflow">goto</span> error;
<a name="l00125"></a>00125 <span class="keywordflow">if</span> (<a class="code" href="file_8h.html#949757705ada92387535cfad72f9243c">file_printf</a>(ms, <span class="stringliteral">")"</span>) == -1)
<a name="l00126"></a>00126 <span class="keywordflow">goto</span> error;
<a name="l00127"></a>00127 rv = 1;
<a name="l00128"></a>00128 <span class="keywordflow">break</span>;
<a name="l00129"></a>00129 }
<a name="l00130"></a>00130 }
<a name="l00131"></a>00131 error:
<a name="l00132"></a>00132 <span class="keywordflow">if</span> (newbuf)
<a name="l00133"></a>00133 free(newbuf);
<a name="l00134"></a>00134 ms-><a class="code" href="structmagic__set.html#7677d8f81949874cf4a626d1d4566fc6">flags</a> |= MAGIC_COMPRESS;
<a name="l00135"></a>00135 <span class="keywordflow">return</span> rv;
<a name="l00136"></a>00136 }
<a name="l00137"></a>00137
<a name="l00138"></a>00138 <span class="comment">/*</span>
<a name="l00139"></a>00139 <span class="comment"> * `safe' write for sockets and pipes.</span>
<a name="l00140"></a>00140 <span class="comment"> */</span>
<a name="l00141"></a>00141 <span class="keyword">private</span> ssize_t
<a name="l00142"></a><a class="code" href="compress_8c.html#bb1e90a0dadf216427c52593e78f1283">00142</a> <a class="code" href="compress_8c.html#bb1e90a0dadf216427c52593e78f1283">swrite</a>(<span class="keywordtype">int</span> fd, <span class="keyword">const</span> <span class="keywordtype">void</span> *buf, size_t n)
<a name="l00143"></a>00143 {
<a name="l00144"></a>00144 <span class="keywordtype">int</span> rv;
<a name="l00145"></a>00145 size_t rn = n;
<a name="l00146"></a>00146
<a name="l00147"></a>00147 <span class="keywordflow">do</span>
<a name="l00148"></a>00148 <span class="keywordflow">switch</span> (rv = write(fd, buf, n)) {
<a name="l00149"></a>00149 <span class="keywordflow">case</span> -1:
<a name="l00150"></a>00150 <span class="keywordflow">if</span> (<a class="code" href="system_8h.html#d65a8842cc674e3ddf69355898c0ecbf">errno</a> == EINTR)
<a name="l00151"></a>00151 <span class="keywordflow">continue</span>;
<a name="l00152"></a>00152 <span class="keywordflow">return</span> -1;
<a name="l00153"></a>00153 <span class="keywordflow">default</span>:
<a name="l00154"></a>00154 n -= rv;
<a name="l00155"></a>00155 buf = ((<span class="keyword">const</span> <span class="keywordtype">char</span> *)buf) + rv;
<a name="l00156"></a>00156 <span class="comment">/*@switchbreak@*/</span> <span class="keywordflow">break</span>;
<a name="l00157"></a>00157 }
<a name="l00158"></a>00158 <span class="keywordflow">while</span> (n > 0);
<a name="l00159"></a>00159 <span class="keywordflow">return</span> rn;
<a name="l00160"></a>00160 }
<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"> * `safe' read for sockets and pipes.</span>
<a name="l00165"></a>00165 <span class="comment"> */</span>
<a name="l00166"></a>00166 <span class="keyword">private</span> ssize_t
<a name="l00167"></a><a class="code" href="compress_8c.html#6b08a68251c48b3e4847e43fd6174001">00167</a> <a class="code" href="compress_8c.html#6b08a68251c48b3e4847e43fd6174001">sread</a>(<span class="keywordtype">int</span> fd, <span class="keywordtype">void</span> *buf, size_t n)
<a name="l00168"></a>00168 {
<a name="l00169"></a>00169 <span class="keywordtype">int</span> rv;
<a name="l00170"></a>00170 size_t rn = n;
<a name="l00171"></a>00171
<a name="l00172"></a>00172 <span class="keywordflow">do</span>
<a name="l00173"></a>00173 <span class="keywordflow">switch</span> (rv = read(fd, buf, n)) {
<a name="l00174"></a>00174 <span class="keywordflow">case</span> -1:
<a name="l00175"></a>00175 <span class="keywordflow">if</span> (<a class="code" href="system_8h.html#d65a8842cc674e3ddf69355898c0ecbf">errno</a> == EINTR)
<a name="l00176"></a>00176 <span class="keywordflow">continue</span>;
<a name="l00177"></a>00177 <span class="keywordflow">return</span> -1;
<a name="l00178"></a>00178 <span class="keywordflow">case</span> 0:
<a name="l00179"></a>00179 <span class="keywordflow">return</span> rn - n;
<a name="l00180"></a>00180 <span class="keywordflow">default</span>:
<a name="l00181"></a>00181 n -= rv;
<a name="l00182"></a>00182 buf = ((<span class="keywordtype">char</span> *)buf) + rv;
<a name="l00183"></a>00183 <span class="comment">/*@switchbreak@*/</span> <span class="keywordflow">break</span>;
<a name="l00184"></a>00184 }
<a name="l00185"></a>00185 <span class="keywordflow">while</span> (n > 0);
<a name="l00186"></a>00186 <span class="keywordflow">return</span> rn;
<a name="l00187"></a>00187 }
<a name="l00188"></a>00188
<a name="l00189"></a>00189 <span class="keyword">protected</span> <span class="keywordtype">int</span>
<a name="l00190"></a><a class="code" href="file_8h.html#af1b240b21ed4868e1704efc606f57dd">00190</a> <a class="code" href="compress_8c.html#af1b240b21ed4868e1704efc606f57dd">file_pipe2file</a>(<span class="keyword">struct</span> <a class="code" href="structmagic__set.html">magic_set</a> *ms, <span class="keywordtype">int</span> fd, <span class="keyword">const</span> <span class="keywordtype">void</span> *startbuf,
<a name="l00191"></a>00191 size_t nbytes)
<a name="l00192"></a>00192 {
<a name="l00193"></a>00193 <span class="keywordtype">char</span> buf[4096];
<a name="l00194"></a>00194 <span class="keywordtype">int</span> r, tfd;
<a name="l00195"></a>00195
<a name="l00196"></a>00196 (void)strcpy(buf, <span class="stringliteral">"/tmp/file.XXXXXX"</span>);
<a name="l00197"></a>00197 <span class="preprocessor">#ifndef HAVE_MKSTEMP</span>
<a name="l00198"></a>00198 <span class="preprocessor"></span> {
<a name="l00199"></a>00199 <span class="keywordtype">char</span> *ptr = mktemp(buf);
<a name="l00200"></a>00200 tfd = open(ptr, O_RDWR|O_TRUNC|O_EXCL|O_CREAT, 0600);
<a name="l00201"></a>00201 r = <a class="code" href="system_8h.html#d65a8842cc674e3ddf69355898c0ecbf">errno</a>;
<a name="l00202"></a>00202 (void)unlink(ptr);
<a name="l00203"></a>00203 <a class="code" href="system_8h.html#d65a8842cc674e3ddf69355898c0ecbf">errno</a> = r;
<a name="l00204"></a>00204 }
<a name="l00205"></a>00205 <span class="preprocessor">#else</span>
<a name="l00206"></a>00206 <span class="preprocessor"></span> tfd = mkstemp(buf);
<a name="l00207"></a>00207 r = <a class="code" href="system_8h.html#d65a8842cc674e3ddf69355898c0ecbf">errno</a>;
<a name="l00208"></a>00208 (void)unlink(buf);
<a name="l00209"></a>00209 <a class="code" href="system_8h.html#d65a8842cc674e3ddf69355898c0ecbf">errno</a> = r;
<a name="l00210"></a>00210 <span class="preprocessor">#endif</span>
<a name="l00211"></a>00211 <span class="preprocessor"></span> <span class="keywordflow">if</span> (tfd == -1) {
<a name="l00212"></a>00212 <a class="code" href="file_8h.html#b97a2a8e3a9e23613bcb1a49c4411919">file_error</a>(ms, <a class="code" href="system_8h.html#d65a8842cc674e3ddf69355898c0ecbf">errno</a>,
<a name="l00213"></a>00213 <span class="stringliteral">"cannot create temporary file for pipe copy"</span>);
<a name="l00214"></a>00214 <span class="keywordflow">return</span> -1;
<a name="l00215"></a>00215 }
<a name="l00216"></a>00216
<a name="l00217"></a>00217 <span class="keywordflow">if</span> (<a class="code" href="compress_8c.html#bb1e90a0dadf216427c52593e78f1283">swrite</a>(tfd, startbuf, nbytes) != (ssize_t)nbytes)
<a name="l00218"></a>00218 r = 1;
<a name="l00219"></a>00219 <span class="keywordflow">else</span> {
<a name="l00220"></a>00220 <span class="keywordflow">while</span> ((r = <a class="code" href="compress_8c.html#6b08a68251c48b3e4847e43fd6174001">sread</a>(fd, buf, <span class="keyword">sizeof</span>(buf))) > 0)
<a name="l00221"></a>00221 <span class="keywordflow">if</span> (<a class="code" href="compress_8c.html#bb1e90a0dadf216427c52593e78f1283">swrite</a>(tfd, buf, (size_t)r) != r)
<a name="l00222"></a>00222 <span class="keywordflow">break</span>;
<a name="l00223"></a>00223 }
<a name="l00224"></a>00224
<a name="l00225"></a>00225 <span class="keywordflow">switch</span> (r) {
<a name="l00226"></a>00226 <span class="keywordflow">case</span> -1:
<a name="l00227"></a>00227 <a class="code" href="file_8h.html#b97a2a8e3a9e23613bcb1a49c4411919">file_error</a>(ms, <a class="code" href="system_8h.html#d65a8842cc674e3ddf69355898c0ecbf">errno</a>, <span class="stringliteral">"error copying from pipe to temp file"</span>);
<a name="l00228"></a>00228 <span class="keywordflow">return</span> -1;
<a name="l00229"></a>00229 <span class="keywordflow">case</span> 0:
<a name="l00230"></a>00230 <span class="keywordflow">break</span>;
<a name="l00231"></a>00231 <span class="keywordflow">default</span>:
<a name="l00232"></a>00232 <a class="code" href="file_8h.html#b97a2a8e3a9e23613bcb1a49c4411919">file_error</a>(ms, <a class="code" href="system_8h.html#d65a8842cc674e3ddf69355898c0ecbf">errno</a>, <span class="stringliteral">"error while writing to temp file"</span>);
<a name="l00233"></a>00233 <span class="keywordflow">return</span> -1;
<a name="l00234"></a>00234 }
<a name="l00235"></a>00235
<a name="l00236"></a>00236 <span class="comment">/*</span>
<a name="l00237"></a>00237 <span class="comment"> * We duplicate the file descriptor, because fclose on a</span>
<a name="l00238"></a>00238 <span class="comment"> * tmpfile will delete the file, but any open descriptors</span>
<a name="l00239"></a>00239 <span class="comment"> * can still access the phantom inode.</span>
<a name="l00240"></a>00240 <span class="comment"> */</span>
<a name="l00241"></a>00241 <span class="keywordflow">if</span> ((fd = dup2(tfd, fd)) == -1) {
<a name="l00242"></a>00242 <a class="code" href="file_8h.html#b97a2a8e3a9e23613bcb1a49c4411919">file_error</a>(ms, <a class="code" href="system_8h.html#d65a8842cc674e3ddf69355898c0ecbf">errno</a>, <span class="stringliteral">"could not dup descriptor for temp file"</span>);
<a name="l00243"></a>00243 <span class="keywordflow">return</span> -1;
<a name="l00244"></a>00244 }
<a name="l00245"></a>00245 (void)close(tfd);
<a name="l00246"></a>00246 <span class="keywordflow">if</span> (lseek(fd, (off_t)0, <a class="code" href="system_8h.html#0d112bae8fd35be772185b6ec6bcbe64">SEEK_SET</a>) == (off_t)-1) {
<a name="l00247"></a>00247 <a class="code" href="file_8h.html#f843575bf69eb8779dca750d93ee623c">file_badseek</a>(ms);
<a name="l00248"></a>00248 <span class="keywordflow">return</span> -1;
<a name="l00249"></a>00249 }
<a name="l00250"></a>00250 <span class="keywordflow">return</span> fd;
<a name="l00251"></a>00251 }
<a name="l00252"></a>00252
<a name="l00253"></a>00253 <span class="preprocessor">#ifdef HAVE_LIBZ</span>
<a name="l00254"></a>00254 <span class="preprocessor"></span>
<a name="l00255"></a>00255 <span class="preprocessor">#define FHCRC (1 << 1)</span>
<a name="l00256"></a>00256 <span class="preprocessor"></span><span class="preprocessor">#define FEXTRA (1 << 2)</span>
<a name="l00257"></a>00257 <span class="preprocessor"></span><span class="preprocessor">#define FNAME (1 << 3)</span>
<a name="l00258"></a>00258 <span class="preprocessor"></span><span class="preprocessor">#define FCOMMENT (1 << 4)</span>
<a name="l00259"></a>00259 <span class="preprocessor"></span>
<a name="l00260"></a>00260 <span class="keyword">private</span> size_t
<a name="l00261"></a>00261 uncompressgzipped(<span class="keyword">struct</span> <a class="code" href="structmagic__set.html">magic_set</a> *ms, <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *old,
<a name="l00262"></a>00262 <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> **newch, size_t n)
<a name="l00263"></a>00263 {
<a name="l00264"></a>00264 <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> flg = old[3];
<a name="l00265"></a>00265 size_t data_start = 10;
<a name="l00266"></a>00266 z_stream z;
<a name="l00267"></a>00267 <span class="keywordtype">int</span> rc;
<a name="l00268"></a>00268
<a name="l00269"></a>00269 <span class="keywordflow">if</span> (flg & FEXTRA) {
<a name="l00270"></a>00270 <span class="keywordflow">if</span> (data_start+1 >= n)
<a name="l00271"></a>00271 <span class="keywordflow">return</span> 0;
<a name="l00272"></a>00272 data_start += 2 + old[data_start] + old[data_start + 1] * 256;
<a name="l00273"></a>00273 }
<a name="l00274"></a>00274 <span class="keywordflow">if</span> (flg & FNAME) {
<a name="l00275"></a>00275 <span class="keywordflow">while</span>(data_start < n && old[data_start])
<a name="l00276"></a>00276 data_start++;
<a name="l00277"></a>00277 data_start++;
<a name="l00278"></a>00278 }
<a name="l00279"></a>00279 <span class="keywordflow">if</span>(flg & FCOMMENT) {
<a name="l00280"></a>00280 <span class="keywordflow">while</span>(data_start < n && old[data_start])
<a name="l00281"></a>00281 data_start++;
<a name="l00282"></a>00282 data_start++;
<a name="l00283"></a>00283 }
<a name="l00284"></a>00284 <span class="keywordflow">if</span>(flg & FHCRC)
<a name="l00285"></a>00285 data_start += 2;
<a name="l00286"></a>00286
<a name="l00287"></a>00287 <span class="keywordflow">if</span> (data_start >= n)
<a name="l00288"></a>00288 <span class="keywordflow">return</span> 0;
<a name="l00289"></a>00289 <span class="keywordflow">if</span> ((*newch = (<span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *)malloc(<a class="code" href="file_8h.html#41e00ab4d3de2683b50119458776bde9">HOWMANY</a> + 1)) == NULL) {
<a name="l00290"></a>00290 <span class="keywordflow">return</span> 0;
<a name="l00291"></a>00291 }
<a name="l00292"></a>00292
<a name="l00293"></a>00293 <span class="comment">/* XXX: const castaway, via strchr */</span>
<a name="l00294"></a>00294 z.next_in = (Bytef *)strchr((<span class="keyword">const</span> <span class="keywordtype">char</span> *)old + data_start,
<a name="l00295"></a>00295 old[data_start]);
<a name="l00296"></a>00296 z.avail_in = n - data_start;
<a name="l00297"></a>00297 z.next_out = *newch;
<a name="l00298"></a>00298 z.avail_out = <a class="code" href="file_8h.html#41e00ab4d3de2683b50119458776bde9">HOWMANY</a>;
<a name="l00299"></a>00299 z.zalloc = Z_NULL;
<a name="l00300"></a>00300 z.zfree = Z_NULL;
<a name="l00301"></a>00301 z.opaque = Z_NULL;
<a name="l00302"></a>00302
<a name="l00303"></a>00303 rc = inflateInit2(&z, -15);
<a name="l00304"></a>00304 <span class="keywordflow">if</span> (rc != Z_OK) {
<a name="l00305"></a>00305 <a class="code" href="file_8h.html#b97a2a8e3a9e23613bcb1a49c4411919">file_error</a>(ms, 0, <span class="stringliteral">"zlib: %s"</span>, z.msg);
<a name="l00306"></a>00306 <span class="keywordflow">return</span> 0;
<a name="l00307"></a>00307 }
<a name="l00308"></a>00308
<a name="l00309"></a>00309 rc = inflate(&z, Z_SYNC_FLUSH);
<a name="l00310"></a>00310 <span class="keywordflow">if</span> (rc != Z_OK && rc != Z_STREAM_END) {
<a name="l00311"></a>00311 <a class="code" href="file_8h.html#b97a2a8e3a9e23613bcb1a49c4411919">file_error</a>(ms, 0, <span class="stringliteral">"zlib: %s"</span>, z.msg);
<a name="l00312"></a>00312 <span class="keywordflow">return</span> 0;
<a name="l00313"></a>00313 }
<a name="l00314"></a>00314
<a name="l00315"></a>00315 n = (size_t)z.total_out;
<a name="l00316"></a>00316 inflateEnd(&z);
<a name="l00317"></a>00317
<a name="l00318"></a>00318 <span class="comment">/* let's keep the nul-terminate tradition */</span>
<a name="l00319"></a>00319 (*newch)[n++] = <span class="charliteral">'\0'</span>;
<a name="l00320"></a>00320
<a name="l00321"></a>00321 <span class="keywordflow">return</span> n;
<a name="l00322"></a>00322 }
<a name="l00323"></a>00323 <span class="preprocessor">#endif</span>
<a name="l00324"></a>00324 <span class="preprocessor"></span>
<a name="l00325"></a>00325 <span class="keyword">private</span> size_t
<a name="l00326"></a><a class="code" href="compress_8c.html#27dbc40030d2439aa5de75c974b909e3">00326</a> <a class="code" href="compress_8c.html#27dbc40030d2439aa5de75c974b909e3">uncompressbuf</a>(<span class="keyword">struct</span> <a class="code" href="structmagic__set.html">magic_set</a> *ms, <span class="keywordtype">int</span> fd, size_t method,
<a name="l00327"></a>00327 <span class="keyword">const</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *old, <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> **newch, size_t n)
<a name="l00328"></a>00328 {
<a name="l00329"></a>00329 <span class="keywordtype">int</span> fdin[2], fdout[2];
<a name="l00330"></a>00330 <span class="keywordtype">int</span> r;
<a name="l00331"></a>00331 pid_t pid1, pid2;
<a name="l00332"></a>00332
<a name="l00333"></a>00333 <span class="preprocessor">#ifdef HAVE_LIBZ</span>
<a name="l00334"></a>00334 <span class="preprocessor"></span> <span class="keywordflow">if</span> (method == 2)
<a name="l00335"></a>00335 <span class="keywordflow">return</span> uncompressgzipped(ms, old, newch, n);
<a name="l00336"></a>00336 <span class="preprocessor">#endif</span>
<a name="l00337"></a>00337 <span class="preprocessor"></span> (void)fflush(stdout);
<a name="l00338"></a>00338 (void)fflush(stderr);
<a name="l00339"></a>00339
<a name="l00340"></a>00340 <span class="keywordflow">if</span> ((fd != -1 && pipe(fdin) == -1) || pipe(fdout) == -1) {
<a name="l00341"></a>00341 <a class="code" href="file_8h.html#b97a2a8e3a9e23613bcb1a49c4411919">file_error</a>(ms, <a class="code" href="system_8h.html#d65a8842cc674e3ddf69355898c0ecbf">errno</a>, <span class="stringliteral">"cannot create pipe"</span>);
<a name="l00342"></a>00342 <span class="keywordflow">return</span> 0;
<a name="l00343"></a>00343 }
<a name="l00344"></a>00344 pid2 = (pid_t)-1;
<a name="l00345"></a>00345 <span class="keywordflow">switch</span> ((pid1=fork())) {
<a name="l00346"></a>00346 <span class="keywordflow">case</span> 0: <span class="comment">/* child */</span>
<a name="l00347"></a>00347 (void) close(0);
<a name="l00348"></a>00348 <span class="keywordflow">if</span> (fd != -1) {
<a name="l00349"></a>00349 (void) dup(fd);
<a name="l00350"></a>00350 (void) lseek(0, (off_t)0, <a class="code" href="system_8h.html#0d112bae8fd35be772185b6ec6bcbe64">SEEK_SET</a>);
<a name="l00351"></a>00351 } <span class="keywordflow">else</span> {
<a name="l00352"></a>00352 (void) dup(fdin[0]);
<a name="l00353"></a>00353 (void) close(fdin[0]);
<a name="l00354"></a>00354 (void) close(fdin[1]);
<a name="l00355"></a>00355 }
<a name="l00356"></a>00356
<a name="l00357"></a>00357 (void) close(1);
<a name="l00358"></a>00358 (void) dup(fdout[1]);
<a name="l00359"></a>00359 (void) close(fdout[0]);
<a name="l00360"></a>00360 (void) close(fdout[1]);
<a name="l00361"></a>00361 <span class="preprocessor">#ifndef DEBUG</span>
<a name="l00362"></a>00362 <span class="preprocessor"></span> <span class="keywordflow">if</span> (compr[method].<a class="code" href="compress_8c.html#582e2ef9670c974c00e00ad10af0e629">silent</a>)
<a name="l00363"></a>00363 (void)close(2);
<a name="l00364"></a>00364 <span class="preprocessor">#endif</span>
<a name="l00365"></a>00365 <span class="preprocessor"></span>
<a name="l00366"></a>00366 execvp(compr[method].<a class="code" href="compress_8c.html#b233d58a2d9af13ae09ea8fd82556856">argv</a>[0],
<a name="l00367"></a>00367 (<span class="keywordtype">char</span> *<span class="keyword">const</span> *)(intptr_t)compr[method].argv);
<a name="l00368"></a>00368 <span class="preprocessor">#ifdef DEBUG</span>
<a name="l00369"></a>00369 <span class="preprocessor"></span> (void)fprintf(stderr, <span class="stringliteral">"exec `%s' failed (%s)\n"</span>,
<a name="l00370"></a>00370 compr[method].argv[0], <a class="code" href="file_8h.html#b6b553574f85ce7727cf5b9a1b638293">strerror</a>(<a class="code" href="system_8h.html#d65a8842cc674e3ddf69355898c0ecbf">errno</a>));
<a name="l00371"></a>00371 <span class="preprocessor">#endif</span>
<a name="l00372"></a>00372 <span class="preprocessor"></span> exit(<a class="code" href="system_8h.html#73efe787c131b385070f25d18b7c9aa4">EXIT_FAILURE</a>);
<a name="l00373"></a>00373 <span class="comment">/*@notreached@*/</span> <span class="keywordflow">break</span>;
<a name="l00374"></a>00374 <span class="keywordflow">case</span> -1:
<a name="l00375"></a>00375 <a class="code" href="file_8h.html#b97a2a8e3a9e23613bcb1a49c4411919">file_error</a>(ms, <a class="code" href="system_8h.html#d65a8842cc674e3ddf69355898c0ecbf">errno</a>, <span class="stringliteral">"could not fork"</span>);
<a name="l00376"></a>00376 <span class="keywordflow">return</span> 0;
<a name="l00377"></a>00377
<a name="l00378"></a>00378 <span class="keywordflow">default</span>: <span class="comment">/* parent */</span>
<a name="l00379"></a>00379 (void) close(fdout[1]);
<a name="l00380"></a>00380 <span class="keywordflow">if</span> (fd == -1) {
<a name="l00381"></a>00381 (void) close(fdin[0]);
<a name="l00382"></a>00382 <span class="comment">/* </span>
<a name="l00383"></a>00383 <span class="comment"> * fork again, to avoid blocking because both</span>
<a name="l00384"></a>00384 <span class="comment"> * pipes filled</span>
<a name="l00385"></a>00385 <span class="comment"> */</span>
<a name="l00386"></a>00386 <span class="keywordflow">switch</span> ((pid2 = fork())) {
<a name="l00387"></a>00387 <span class="keywordflow">case</span> 0: <span class="comment">/* child */</span>
<a name="l00388"></a>00388 (void)close(fdout[0]);
<a name="l00389"></a>00389 <span class="keywordflow">if</span> (<a class="code" href="compress_8c.html#bb1e90a0dadf216427c52593e78f1283">swrite</a>(fdin[1], old, n) != n) {
<a name="l00390"></a>00390 <span class="preprocessor">#ifdef DEBUG</span>
<a name="l00391"></a>00391 <span class="preprocessor"></span> (void)fprintf(stderr,
<a name="l00392"></a>00392 <span class="stringliteral">"Write failed (%s)\n"</span>,
<a name="l00393"></a>00393 <a class="code" href="file_8h.html#b6b553574f85ce7727cf5b9a1b638293">strerror</a>(<a class="code" href="system_8h.html#d65a8842cc674e3ddf69355898c0ecbf">errno</a>));
<a name="l00394"></a>00394 <span class="preprocessor">#endif</span>
<a name="l00395"></a>00395 <span class="preprocessor"></span> exit(<a class="code" href="system_8h.html#73efe787c131b385070f25d18b7c9aa4">EXIT_FAILURE</a>);
<a name="l00396"></a>00396 <span class="comment">/*@notreached@*/</span> <span class="comment">/*@innerbreak@*/</span> <span class="keywordflow">break</span>;
<a name="l00397"></a>00397 }
<a name="l00398"></a>00398 exit(EXIT_SUCCESS);
<a name="l00399"></a>00399 <span class="comment">/*@notreached@*/</span> <span class="comment">/*@innerbreak@*/</span> <span class="keywordflow">break</span>;
<a name="l00400"></a>00400
<a name="l00401"></a>00401 <span class="keywordflow">case</span> -1:
<a name="l00402"></a>00402 <span class="preprocessor">#ifdef DEBUG</span>
<a name="l00403"></a>00403 <span class="preprocessor"></span> (void)fprintf(stderr, <span class="stringliteral">"Fork failed (%s)\n"</span>,
<a name="l00404"></a>00404 <a class="code" href="file_8h.html#b6b553574f85ce7727cf5b9a1b638293">strerror</a>(<a class="code" href="system_8h.html#d65a8842cc674e3ddf69355898c0ecbf">errno</a>));
<a name="l00405"></a>00405 <span class="preprocessor">#endif</span>
<a name="l00406"></a>00406 <span class="preprocessor"></span> exit(<a class="code" href="system_8h.html#73efe787c131b385070f25d18b7c9aa4">EXIT_FAILURE</a>);
<a name="l00407"></a>00407 <span class="comment">/*@notreached@*/</span> <span class="comment">/*@innerbreak@*/</span> <span class="keywordflow">break</span>;
<a name="l00408"></a>00408
<a name="l00409"></a>00409 <span class="keywordflow">default</span>: <span class="comment">/* parent */</span>
<a name="l00410"></a>00410 <span class="comment">/*@innerbreak@*/</span> <span class="keywordflow">break</span>;
<a name="l00411"></a>00411 }
<a name="l00412"></a>00412 (void) close(fdin[1]);
<a name="l00413"></a>00413 fdin[1] = -1;
<a name="l00414"></a>00414 }
<a name="l00415"></a>00415
<a name="l00416"></a>00416 <span class="keywordflow">if</span> ((*newch = (<span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> *) malloc(<a class="code" href="file_8h.html#41e00ab4d3de2683b50119458776bde9">HOWMANY</a> + 1)) == NULL) {
<a name="l00417"></a>00417 <span class="preprocessor">#ifdef DEBUG</span>
<a name="l00418"></a>00418 <span class="preprocessor"></span> (void)fprintf(stderr, <span class="stringliteral">"Malloc failed (%s)\n"</span>,
<a name="l00419"></a>00419 <a class="code" href="file_8h.html#b6b553574f85ce7727cf5b9a1b638293">strerror</a>(<a class="code" href="system_8h.html#d65a8842cc674e3ddf69355898c0ecbf">errno</a>));
<a name="l00420"></a>00420 <span class="preprocessor">#endif</span>
<a name="l00421"></a>00421 <span class="preprocessor"></span> n = 0;
<a name="l00422"></a>00422 <span class="keywordflow">goto</span> err;
<a name="l00423"></a>00423 }
<a name="l00424"></a>00424 <span class="keywordflow">if</span> ((r = <a class="code" href="compress_8c.html#6b08a68251c48b3e4847e43fd6174001">sread</a>(fdout[0], *newch, <a class="code" href="file_8h.html#41e00ab4d3de2683b50119458776bde9">HOWMANY</a>)) <= 0) {
<a name="l00425"></a>00425 <span class="preprocessor">#ifdef DEBUG</span>
<a name="l00426"></a>00426 <span class="preprocessor"></span> (void)fprintf(stderr, <span class="stringliteral">"Read failed (%s)\n"</span>,
<a name="l00427"></a>00427 <a class="code" href="file_8h.html#b6b553574f85ce7727cf5b9a1b638293">strerror</a>(<a class="code" href="system_8h.html#d65a8842cc674e3ddf69355898c0ecbf">errno</a>));
<a name="l00428"></a>00428 <span class="preprocessor">#endif</span>
<a name="l00429"></a>00429 <span class="preprocessor"></span> free(*newch);
<a name="l00430"></a>00430 n = 0;
<a name="l00431"></a>00431 newch[0] = <span class="charliteral">'\0'</span>;
<a name="l00432"></a>00432 <span class="keywordflow">goto</span> err;
<a name="l00433"></a>00433 } <span class="keywordflow">else</span> {
<a name="l00434"></a>00434 n = r;
<a name="l00435"></a>00435 }
<a name="l00436"></a>00436 <span class="comment">/* NUL terminate, as every buffer is handled here. */</span>
<a name="l00437"></a>00437 (*newch)[n++] = <span class="charliteral">'\0'</span>;
<a name="l00438"></a>00438 err:
<a name="l00439"></a>00439 <span class="keywordflow">if</span> (fdin[1] != -1)
<a name="l00440"></a>00440 (void) close(fdin[1]);
<a name="l00441"></a>00441 (void) close(fdout[0]);
<a name="l00442"></a>00442 waitpid(pid1, NULL, 0);
<a name="l00443"></a>00443 <span class="keywordflow">if</span> (pid2 != (pid_t)-1)
<a name="l00444"></a>00444 waitpid(pid2, NULL, 0);
<a name="l00445"></a>00445 <span class="keywordflow">return</span> n;
<a name="l00446"></a>00446 }
<a name="l00447"></a>00447 <span class="comment">/*@notreached@*/</span>
<a name="l00448"></a>00448 }
</pre></div><hr size="1"><address style="align: right;"><small>Generated on 1 Oct 2013 for rpm by
<a href="http://www.doxygen.org/index.html">
<img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.4.7 </small></address>
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