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<!DOCTYPE html>
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<title>Binary I/O operation ｜ 回风舞雪</title>
<meta name="description" content="I coped with character type coversion to let it looks like c type, and search bytes from *.dll to modify it. so, there is sth I learned and written down here.
# Binary I/O operation Define!
def hex_read(filepath: str) -&gt; bytearray: if os.path.isfile(filepath): with open(filepath, &#39;rb&#39;) as f: data = bytearray(f.read()) return data Usage:
dll_data = hex_read(&#39;D:\\test\\test.dll&#39;) Find bytes and replace it:
index_start = dll_data.find(b&#39;\x85\x69\xf0\x7f&#39;) index_end = index_start + 100 if index_start != -1: data_old = dll_data[index_start:index_end] data_new = replacebytes # replacebytes is the content you want to replace dll_data_new = dll_data.replace(data_old, data_new) with open(&#39;D:\\test\\test.dll&#39;, &#39;wb&#39;) as f: f.write(dll_data_new) " />
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<h2><a href='/posts/binary-io-operation/'>Binary I/O operation</a></h2>
<span class="date">2019.07.26</span>
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<div class="post_content markdown"><p>I coped with character type coversion to let it looks like c type, and search bytes from <code>*.dll</code> to modify it.
so, there is sth I learned and written down here.</p>
<h1 id="-binary-io-operation"># Binary I/O operation</h1>
<p>Define!</p>
<div class="highlight"><pre class="chroma"><code class="language-python" data-lang="python"><span class="k">def</span> <span class="nf">hex_read</span><span class="p">(</span><span class="n">filepath</span><span class="p">:</span> <span class="nb">str</span><span class="p">)</span> <span class="o">-></span> <span class="nb">bytearray</span><span class="p">:</span>
<span class="k">if</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">isfile</span><span class="p">(</span><span class="n">filepath</span><span class="p">):</span>
<span class="k">with</span> <span class="nb">open</span><span class="p">(</span><span class="n">filepath</span><span class="p">,</span> <span class="s1">'rb'</span><span class="p">)</span> <span class="k">as</span> <span class="n">f</span><span class="p">:</span>
<span class="n">data</span> <span class="o">=</span> <span class="nb">bytearray</span><span class="p">(</span><span class="n">f</span><span class="o">.</span><span class="n">read</span><span class="p">())</span>
<span class="k">return</span> <span class="n">data</span>
</code></pre></div><p>Usage:</p>
<div class="highlight"><pre class="chroma"><code class="language-python" data-lang="python"><span class="n">dll_data</span> <span class="o">=</span> <span class="n">hex_read</span><span class="p">(</span><span class="s1">'D:</span><span class="se">\\</span><span class="s1">test</span><span class="se">\\</span><span class="s1">test.dll'</span><span class="p">)</span>
</code></pre></div><p>Find bytes and replace it:</p>
<div class="highlight"><pre class="chroma"><code class="language-python" data-lang="python"><span class="n">index_start</span> <span class="o">=</span> <span class="n">dll_data</span><span class="o">.</span><span class="n">find</span><span class="p">(</span><span class="sa">b</span><span class="s1">'</span><span class="se">\x85\x69\xf0\x7f</span><span class="s1">'</span><span class="p">)</span>
<span class="n">index_end</span> <span class="o">=</span> <span class="n">index_start</span> <span class="o">+</span> <span class="mi">100</span>
<span class="k">if</span> <span class="n">index_start</span> <span class="o">!=</span> <span class="o">-</span><span class="mi">1</span><span class="p">:</span>
<span class="n">data_old</span> <span class="o">=</span> <span class="n">dll_data</span><span class="p">[</span><span class="n">index_start</span><span class="p">:</span><span class="n">index_end</span><span class="p">]</span>
<span class="n">data_new</span> <span class="o">=</span> <span class="n">replacebytes</span> <span class="c1"># replacebytes is the content you want to replace</span>
<span class="n">dll_data_new</span> <span class="o">=</span> <span class="n">dll_data</span><span class="o">.</span><span class="n">replace</span><span class="p">(</span><span class="n">data_old</span><span class="p">,</span> <span class="n">data_new</span><span class="p">)</span>
<span class="k">with</span> <span class="nb">open</span><span class="p">(</span><span class="s1">'D:</span><span class="se">\\</span><span class="s1">test</span><span class="se">\\</span><span class="s1">test.dll'</span><span class="p">,</span> <span class="s1">'wb'</span><span class="p">)</span> <span class="k">as</span> <span class="n">f</span><span class="p">:</span>
<span class="n">f</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="n">dll_data_new</span><span class="p">)</span>
</code></pre></div></div>
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