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<p style="color: #777777;">
<a href="https://gitlab.rtems.org/TheSamPrice">Sam Price</a>
<a href="https://gitlab.rtems.org/rtems/rtos/rtems/-/work_items/5772#note_159161">commented</a>:
</p>
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<p dir="auto" style="color: #3a383f; margin: 0px 0px 1rem;" align="initial">If it helps I am using zlib from RTEMS, with small wrappers around them.
Might be a starting point?</p>
<div class="gl-relative markdown-code-block js-markdown-code" style="margin-bottom: 0px;">
<pre data-canonical-lang="c" class="code highlight js-syntax-highlight language-c" v-pre="true" style="display: block; font-size: 14px; color: #3a383f; line-height: 1.6em; overflow-x: auto; border-radius: .25rem; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; margin: 0px 0 1rem; padding: 12px; border: 1px solid #dcdcde;"><code style="font-size: inherit; color: inherit; word-wrap: normal; word-break: keep-all; background-color: inherit; border-radius: .25rem; white-space: pre; margin-top: 0px; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; overflow-wrap: normal; padding: unset;"><span id="LC1" class="line" data-lang="c" style="margin-top: 0px;"><span class="cp" style="margin-top: 0px;">#include</span> <span class="cpf"><stdio.h></span></span>
<span id="LC2" class="line" data-lang="c"><span class="cp" style="margin-top: 0px;">#include</span> <span class="cpf"><stdlib.h></span></span>
<span id="LC3" class="line" data-lang="c"><span class="cp" style="margin-top: 0px;">#include</span> <span class="cpf"><zlib.h></span></span>
<span id="LC4" class="line" data-lang="c"><span class="cp" style="margin-top: 0px;">#include</span> <span class="cpf"><rtems/shell.h></span></span>
<span id="LC5" class="line" data-lang="c"></span>
<span id="LC6" class="line" data-lang="c"><span class="cp" style="margin-top: 0px;">#define CHUNK 16384</span></span>
<span id="LC7" class="line" data-lang="c"></span>
<span id="LC8" class="line" data-lang="c"><span class="k" style="margin-top: 0px;">static</span> <span class="kt">int</span> <span class="nf">compress_file</span><span class="p">(</span><span class="k">const</span> <span class="kt">char</span> <span class="o">*</span><span class="n">inpath</span><span class="p">)</span> <span class="p">{</span></span>
<span id="LC9" class="line" data-lang="c">  <span class="kt" style="margin-top: 0px;">char</span> <span class="n">outpath</span><span class="p">[</span><span class="mi">256</span><span class="p">];</span></span>
<span id="LC10" class="line" data-lang="c">  <span class="n" style="margin-top: 0px;">sprintf</span><span class="p">(</span><span class="n">outpath</span><span class="p">,</span> <span class="s">"%s.gz"</span><span class="p">,</span> <span class="n">inpath</span><span class="p">);</span></span>
<span id="LC11" class="line" data-lang="c"></span>
<span id="LC12" class="line" data-lang="c">  <span class="kt" style="margin-top: 0px;">FILE</span> <span class="o">*</span><span class="n">fin</span> <span class="o">=</span> <span class="n">fopen</span><span class="p">(</span><span class="n">inpath</span><span class="p">,</span> <span class="s">"rb"</span><span class="p">);</span></span>
<span id="LC13" class="line" data-lang="c">  <span class="n" style="margin-top: 0px;">gzFile</span> <span class="n">fout</span> <span class="o">=</span> <span class="n">gzopen</span><span class="p">(</span><span class="n">outpath</span><span class="p">,</span> <span class="s">"wb"</span><span class="p">);</span></span>
<span id="LC14" class="line" data-lang="c">  <span class="k" style="margin-top: 0px;">if</span> <span class="p">(</span><span class="o">!</span><span class="n">fin</span> <span class="o">||</span> <span class="o">!</span><span class="n">fout</span><span class="p">)</span> <span class="p">{</span></span>
<span id="LC15" class="line" data-lang="c">    <span class="n" style="margin-top: 0px;">fprintf</span><span class="p">(</span><span class="n">stderr</span><span class="p">,</span> <span class="s">"Error opening files</span><span class="se">\n</span><span class="s">"</span><span class="p">);</span></span>
<span id="LC16" class="line" data-lang="c">    <span class="k" style="margin-top: 0px;">if</span> <span class="p">(</span><span class="n">fin</span><span class="p">)</span> <span class="n">fclose</span><span class="p">(</span><span class="n">fin</span><span class="p">);</span></span>
<span id="LC17" class="line" data-lang="c">    <span class="k" style="margin-top: 0px;">if</span> <span class="p">(</span><span class="n">fout</span><span class="p">)</span> <span class="n">gzclose</span><span class="p">(</span><span class="n">fout</span><span class="p">);</span></span>
<span id="LC18" class="line" data-lang="c">    <span class="k" style="margin-top: 0px;">return</span> <span class="o">-</span><span class="mi">1</span><span class="p">;</span></span>
<span id="LC19" class="line" data-lang="c">  <span class="p" style="margin-top: 0px;">}</span></span>
<span id="LC20" class="line" data-lang="c"></span>
<span id="LC21" class="line" data-lang="c">  <span class="kt" style="margin-top: 0px;">char</span> <span class="n">buf</span><span class="p">[</span><span class="n">CHUNK</span><span class="p">];</span></span>
<span id="LC22" class="line" data-lang="c">  <span class="kt" style="margin-top: 0px;">int</span> <span class="n">len</span><span class="p">;</span></span>
<span id="LC23" class="line" data-lang="c">  <span class="k" style="margin-top: 0px;">while</span> <span class="p">((</span><span class="n">len</span> <span class="o">=</span> <span class="n">fread</span><span class="p">(</span><span class="n">buf</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="n">CHUNK</span><span class="p">,</span> <span class="n">fin</span><span class="p">))</span> <span class="o">></span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span></span>
<span id="LC24" class="line" data-lang="c">    <span class="k" style="margin-top: 0px;">if</span> <span class="p">(</span><span class="n">gzwrite</span><span class="p">(</span><span class="n">fout</span><span class="p">,</span> <span class="n">buf</span><span class="p">,</span> <span class="n">len</span><span class="p">)</span> <span class="o">!=</span> <span class="n">len</span><span class="p">)</span> <span class="p">{</span></span>
<span id="LC25" class="line" data-lang="c">      <span class="n" style="margin-top: 0px;">fprintf</span><span class="p">(</span><span class="n">stderr</span><span class="p">,</span> <span class="s">"Write error</span><span class="se">\n</span><span class="s">"</span><span class="p">);</span></span>
<span id="LC26" class="line" data-lang="c">      <span class="n" style="margin-top: 0px;">fclose</span><span class="p">(</span><span class="n">fin</span><span class="p">);</span></span>
<span id="LC27" class="line" data-lang="c">      <span class="n" style="margin-top: 0px;">gzclose</span><span class="p">(</span><span class="n">fout</span><span class="p">);</span></span>
<span id="LC28" class="line" data-lang="c">      <span class="k" style="margin-top: 0px;">return</span> <span class="o">-</span><span class="mi">1</span><span class="p">;</span></span>
<span id="LC29" class="line" data-lang="c">    <span class="p" style="margin-top: 0px;">}</span></span>
<span id="LC30" class="line" data-lang="c">  <span class="p" style="margin-top: 0px;">}</span></span>
<span id="LC31" class="line" data-lang="c"></span>
<span id="LC32" class="line" data-lang="c">  <span class="n" style="margin-top: 0px;">fclose</span><span class="p">(</span><span class="n">fin</span><span class="p">);</span></span>
<span id="LC33" class="line" data-lang="c">  <span class="n" style="margin-top: 0px;">gzclose</span><span class="p">(</span><span class="n">fout</span><span class="p">);</span></span>
<span id="LC34" class="line" data-lang="c">  <span class="n" style="margin-top: 0px;">printf</span><span class="p">(</span><span class="s">"Compressed to %s</span><span class="se">\n</span><span class="s">"</span><span class="p">,</span> <span class="n">outpath</span><span class="p">);</span></span>
<span id="LC35" class="line" data-lang="c">  <span class="k" style="margin-top: 0px;">return</span> <span class="mi">0</span><span class="p">;</span></span>
<span id="LC36" class="line" data-lang="c"><span class="p" style="margin-top: 0px;">}</span></span>
<span id="LC37" class="line" data-lang="c"></span>
<span id="LC38" class="line" data-lang="c"><span class="k" style="margin-top: 0px;">static</span> <span class="kt">int</span> <span class="nf">decompress_file</span><span class="p">(</span><span class="k">const</span> <span class="kt">char</span> <span class="o">*</span><span class="n">inpath</span><span class="p">)</span> <span class="p">{</span></span>
<span id="LC39" class="line" data-lang="c">  <span class="k" style="margin-top: 0px;">if</span> <span class="p">(</span><span class="o">!</span><span class="n">strstr</span><span class="p">(</span><span class="n">inpath</span><span class="p">,</span> <span class="s">".gz"</span><span class="p">))</span> <span class="p">{</span></span>
<span id="LC40" class="line" data-lang="c">    <span class="n" style="margin-top: 0px;">fprintf</span><span class="p">(</span><span class="n">stderr</span><span class="p">,</span> <span class="s">"Input must end in .gz</span><span class="se">\n</span><span class="s">"</span><span class="p">);</span></span>
<span id="LC41" class="line" data-lang="c">    <span class="k" style="margin-top: 0px;">return</span> <span class="o">-</span><span class="mi">1</span><span class="p">;</span></span>
<span id="LC42" class="line" data-lang="c">  <span class="p" style="margin-top: 0px;">}</span></span>
<span id="LC43" class="line" data-lang="c"></span>
<span id="LC44" class="line" data-lang="c">  <span class="kt" style="margin-top: 0px;">char</span> <span class="n">outpath</span><span class="p">[</span><span class="mi">256</span><span class="p">];</span></span>
<span id="LC45" class="line" data-lang="c">  <span class="n" style="margin-top: 0px;">strcpy</span><span class="p">(</span><span class="n">outpath</span><span class="p">,</span> <span class="n">inpath</span><span class="p">);</span></span>
<span id="LC46" class="line" data-lang="c">  <span class="n" style="margin-top: 0px;">outpath</span><span class="p">[</span><span class="n">strlen</span><span class="p">(</span><span class="n">outpath</span><span class="p">)</span> <span class="o">-</span> <span class="mi">3</span><span class="p">]</span> <span class="o">=</span> <span class="sc">'\0'</span><span class="p">;</span>  <span class="c1">// remove ".gz"</span></span>
<span id="LC47" class="line" data-lang="c"></span>
<span id="LC48" class="line" data-lang="c">  <span class="n" style="margin-top: 0px;">gzFile</span> <span class="n">fin</span> <span class="o">=</span> <span class="n">gzopen</span><span class="p">(</span><span class="n">inpath</span><span class="p">,</span> <span class="s">"rb"</span><span class="p">);</span></span>
<span id="LC49" class="line" data-lang="c">  <span class="kt" style="margin-top: 0px;">FILE</span> <span class="o">*</span><span class="n">fout</span> <span class="o">=</span> <span class="n">fopen</span><span class="p">(</span><span class="n">outpath</span><span class="p">,</span> <span class="s">"wb"</span><span class="p">);</span></span>
<span id="LC50" class="line" data-lang="c">  <span class="k" style="margin-top: 0px;">if</span> <span class="p">(</span><span class="o">!</span><span class="n">fin</span> <span class="o">||</span> <span class="o">!</span><span class="n">fout</span><span class="p">)</span> <span class="p">{</span></span>
<span id="LC51" class="line" data-lang="c">    <span class="n" style="margin-top: 0px;">fprintf</span><span class="p">(</span><span class="n">stderr</span><span class="p">,</span> <span class="s">"Error opening files</span><span class="se">\n</span><span class="s">"</span><span class="p">);</span></span>
<span id="LC52" class="line" data-lang="c">    <span class="k" style="margin-top: 0px;">if</span> <span class="p">(</span><span class="n">fin</span><span class="p">)</span> <span class="n">gzclose</span><span class="p">(</span><span class="n">fin</span><span class="p">);</span></span>
<span id="LC53" class="line" data-lang="c">    <span class="k" style="margin-top: 0px;">if</span> <span class="p">(</span><span class="n">fout</span><span class="p">)</span> <span class="n">fclose</span><span class="p">(</span><span class="n">fout</span><span class="p">);</span></span>
<span id="LC54" class="line" data-lang="c">    <span class="k" style="margin-top: 0px;">return</span> <span class="o">-</span><span class="mi">1</span><span class="p">;</span></span>
<span id="LC55" class="line" data-lang="c">  <span class="p" style="margin-top: 0px;">}</span></span>
<span id="LC56" class="line" data-lang="c"></span>
<span id="LC57" class="line" data-lang="c">  <span class="kt" style="margin-top: 0px;">char</span> <span class="n">buf</span><span class="p">[</span><span class="n">CHUNK</span><span class="p">];</span></span>
<span id="LC58" class="line" data-lang="c">  <span class="kt" style="margin-top: 0px;">int</span> <span class="n">len</span><span class="p">;</span></span>
<span id="LC59" class="line" data-lang="c">  <span class="k" style="margin-top: 0px;">while</span> <span class="p">((</span><span class="n">len</span> <span class="o">=</span> <span class="n">gzread</span><span class="p">(</span><span class="n">fin</span><span class="p">,</span> <span class="n">buf</span><span class="p">,</span> <span class="n">CHUNK</span><span class="p">))</span> <span class="o">></span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span></span>
<span id="LC60" class="line" data-lang="c">    <span class="k" style="margin-top: 0px;">if</span> <span class="p">(</span><span class="n">fwrite</span><span class="p">(</span><span class="n">buf</span><span class="p">,</span> <span class="mi">1</span><span class="p">,</span> <span class="n">len</span><span class="p">,</span> <span class="n">fout</span><span class="p">)</span> <span class="o">!=</span> <span class="n">len</span><span class="p">)</span> <span class="p">{</span></span>
<span id="LC61" class="line" data-lang="c">      <span class="n" style="margin-top: 0px;">fprintf</span><span class="p">(</span><span class="n">stderr</span><span class="p">,</span> <span class="s">"Write error</span><span class="se">\n</span><span class="s">"</span><span class="p">);</span></span>
<span id="LC62" class="line" data-lang="c">      <span class="n" style="margin-top: 0px;">gzclose</span><span class="p">(</span><span class="n">fin</span><span class="p">);</span></span>
<span id="LC63" class="line" data-lang="c">      <span class="n" style="margin-top: 0px;">fclose</span><span class="p">(</span><span class="n">fout</span><span class="p">);</span></span>
<span id="LC64" class="line" data-lang="c">      <span class="k" style="margin-top: 0px;">return</span> <span class="o">-</span><span class="mi">1</span><span class="p">;</span></span>
<span id="LC65" class="line" data-lang="c">    <span class="p" style="margin-top: 0px;">}</span></span>
<span id="LC66" class="line" data-lang="c">  <span class="p" style="margin-top: 0px;">}</span></span>
<span id="LC67" class="line" data-lang="c"></span>
<span id="LC68" class="line" data-lang="c">  <span class="n" style="margin-top: 0px;">gzclose</span><span class="p">(</span><span class="n">fin</span><span class="p">);</span></span>
<span id="LC69" class="line" data-lang="c">  <span class="n" style="margin-top: 0px;">fclose</span><span class="p">(</span><span class="n">fout</span><span class="p">);</span></span>
<span id="LC70" class="line" data-lang="c">  <span class="n" style="margin-top: 0px;">printf</span><span class="p">(</span><span class="s">"Decompressed to %s</span><span class="se">\n</span><span class="s">"</span><span class="p">,</span> <span class="n">outpath</span><span class="p">);</span></span>
<span id="LC71" class="line" data-lang="c">  <span class="k" style="margin-top: 0px;">return</span> <span class="mi">0</span><span class="p">;</span></span>
<span id="LC72" class="line" data-lang="c"><span class="p" style="margin-top: 0px;">}</span></span>
<span id="LC73" class="line" data-lang="c"></span>
<span id="LC74" class="line" data-lang="c"><span class="k" style="margin-top: 0px;">static</span> <span class="kt">int</span> <span class="nf">rtems_shell_compress</span><span class="p">(</span><span class="kt">int</span> <span class="n">argc</span><span class="p">,</span> <span class="kt">char</span> <span class="o">**</span><span class="n">argv</span><span class="p">)</span> <span class="p">{</span></span>
<span id="LC75" class="line" data-lang="c">  <span class="k" style="margin-top: 0px;">if</span> <span class="p">(</span><span class="n">argc</span> <span class="o">!=</span> <span class="mi">2</span><span class="p">)</span> <span class="p">{</span></span>
<span id="LC76" class="line" data-lang="c">    <span class="n" style="margin-top: 0px;">printf</span><span class="p">(</span><span class="s">"Usage: compress <file></span><span class="se">\n</span><span class="s">"</span><span class="p">);</span></span>
<span id="LC77" class="line" data-lang="c">    <span class="k" style="margin-top: 0px;">return</span> <span class="mi">1</span><span class="p">;</span></span>
<span id="LC78" class="line" data-lang="c">  <span class="p" style="margin-top: 0px;">}</span></span>
<span id="LC79" class="line" data-lang="c">  <span class="k" style="margin-top: 0px;">return</span> <span class="n">compress_file</span><span class="p">(</span><span class="n">argv</span><span class="p">[</span><span class="mi">1</span><span class="p">]);</span></span>
<span id="LC80" class="line" data-lang="c"><span class="p" style="margin-top: 0px;">}</span></span>
<span id="LC81" class="line" data-lang="c"></span>
<span id="LC82" class="line" data-lang="c"><span class="k" style="margin-top: 0px;">static</span> <span class="kt">int</span> <span class="nf">rtems_shell_decompress</span><span class="p">(</span><span class="kt">int</span> <span class="n">argc</span><span class="p">,</span> <span class="kt">char</span> <span class="o">**</span><span class="n">argv</span><span class="p">)</span> <span class="p">{</span></span>
<span id="LC83" class="line" data-lang="c">  <span class="k" style="margin-top: 0px;">if</span> <span class="p">(</span><span class="n">argc</span> <span class="o">!=</span> <span class="mi">2</span><span class="p">)</span> <span class="p">{</span></span>
<span id="LC84" class="line" data-lang="c">    <span class="n" style="margin-top: 0px;">printf</span><span class="p">(</span><span class="s">"Usage: decompress <file.gz></span><span class="se">\n</span><span class="s">"</span><span class="p">);</span></span>
<span id="LC85" class="line" data-lang="c">    <span class="k" style="margin-top: 0px;">return</span> <span class="mi">1</span><span class="p">;</span></span>
<span id="LC86" class="line" data-lang="c">  <span class="p" style="margin-top: 0px;">}</span></span>
<span id="LC87" class="line" data-lang="c">  <span class="k" style="margin-top: 0px;">return</span> <span class="n">decompress_file</span><span class="p">(</span><span class="n">argv</span><span class="p">[</span><span class="mi">1</span><span class="p">]);</span></span>
<span id="LC88" class="line" data-lang="c"><span class="p" style="margin-top: 0px;">}</span></span>
<span id="LC89" class="line" data-lang="c"></span>
<span id="LC90" class="line" data-lang="c"></span>
<span id="LC91" class="line" data-lang="c"><span class="kt" style="margin-top: 0px;">void</span> <span class="nf">rki_add_compress_commands</span><span class="p">(){</span></span>
<span id="LC92" class="line" data-lang="c">    <span class="n" style="margin-top: 0px;">rtems_shell_add_cmd</span><span class="p">(</span><span class="s">"compress"</span><span class="p">,</span> <span class="s">"file"</span><span class="p">,</span> <span class="s">"compress <file> </span><span class="se">\n</span><span class="s"> Outputs file.gz"</span><span class="p">,</span> <span class="n">rtems_shell_compress</span><span class="p">);</span></span>
<span id="LC93" class="line" data-lang="c">    <span class="n" style="margin-top: 0px;">rtems_shell_add_cmd</span><span class="p">(</span><span class="s">"decompress"</span><span class="p">,</span> <span class="s">"file"</span><span class="p">,</span> <span class="s">"decompress <file.gz>"</span><span class="p">,</span> <span class="n">rtems_shell_decompress</span><span class="p">);</span></span>
<span id="LC94" class="line" data-lang="c"></span>
<span id="LC95" class="line" data-lang="c"><span class="p" style="margin-top: 0px;">}</span></span></code></pre>
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