44 lines
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4.7 KiB
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44 lines
No EOL
4.7 KiB
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<title>int_to_binary (CFPropertyList::Binary)</title>
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<pre><span class="ruby-comment cmt"># File rbBinaryCFPropertyList.rb, line 545</span>
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<span class="ruby-keyword kw">def</span> <span class="ruby-identifier">int_to_binary</span>(<span class="ruby-identifier">value</span>)
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<span class="ruby-identifier">nbytes</span> = <span class="ruby-value">0</span>
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<span class="ruby-identifier">nbytes</span> = <span class="ruby-value">1</span> <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">value</span> <span class="ruby-operator">></span> <span class="ruby-value">0x</span><span class="ruby-constant">FF</span> <span class="ruby-comment cmt"># 1 byte integer</span>
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<span class="ruby-identifier">nbytes</span> <span class="ruby-operator">+=</span> <span class="ruby-value">1</span> <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">value</span> <span class="ruby-operator">></span> <span class="ruby-value">0x</span><span class="ruby-constant">FFFF</span> <span class="ruby-comment cmt"># 4 byte integer</span>
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<span class="ruby-identifier">nbytes</span> <span class="ruby-operator">+=</span> <span class="ruby-value">1</span> <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">value</span> <span class="ruby-operator">></span> <span class="ruby-value">0x</span><span class="ruby-constant">FFFFFFFF</span> <span class="ruby-comment cmt"># 8 byte integer</span>
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<span class="ruby-identifier">nbytes</span> = <span class="ruby-value">3</span> <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">value</span> <span class="ruby-operator"><</span> <span class="ruby-value">0</span> <span class="ruby-comment cmt"># 8 byte integer, since signed</span>
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<span class="ruby-identifier">bdata</span> = <span class="ruby-constant">Binary</span>.<span class="ruby-identifier">type_bytes</span>(<span class="ruby-value str">"1"</span>, <span class="ruby-identifier">nbytes</span>) <span class="ruby-comment cmt"># 1 is 0001, type indicator for integer</span>
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<span class="ruby-identifier">buff</span> = <span class="ruby-value str">""</span>
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<span class="ruby-keyword kw">if</span>(<span class="ruby-identifier">nbytes</span> <span class="ruby-operator"><</span> <span class="ruby-value">3</span>) <span class="ruby-keyword kw">then</span>
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<span class="ruby-identifier">fmt</span> = <span class="ruby-value str">"N"</span>
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<span class="ruby-keyword kw">if</span>(<span class="ruby-identifier">nbytes</span> <span class="ruby-operator">==</span> <span class="ruby-value">0</span>) <span class="ruby-keyword kw">then</span>
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<span class="ruby-identifier">fmt</span> = <span class="ruby-value str">"C"</span>
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<span class="ruby-keyword kw">elsif</span>(<span class="ruby-identifier">nbytes</span> <span class="ruby-operator">==</span> <span class="ruby-value">1</span>)
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<span class="ruby-identifier">fmt</span> = <span class="ruby-value str">"n"</span>
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<span class="ruby-keyword kw">end</span>
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<span class="ruby-identifier">buff</span> = [<span class="ruby-identifier">value</span>].<span class="ruby-identifier">pack</span>(<span class="ruby-identifier">fmt</span>)
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<span class="ruby-keyword kw">else</span>
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<span class="ruby-comment cmt"># 64 bit signed integer; we need the higher and the lower 32 bit of the value</span>
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<span class="ruby-identifier">high_word</span> = <span class="ruby-identifier">value</span> <span class="ruby-operator">>></span> <span class="ruby-value">32</span>
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<span class="ruby-identifier">low_word</span> = <span class="ruby-identifier">value</span> <span class="ruby-operator">&</span> <span class="ruby-value">0x</span><span class="ruby-constant">FFFFFFFF</span>
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<span class="ruby-identifier">buff</span> = [<span class="ruby-identifier">high_word</span>,<span class="ruby-identifier">low_word</span>].<span class="ruby-identifier">pack</span>(<span class="ruby-value str">"NN"</span>)
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<span class="ruby-keyword kw">end</span>
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<span class="ruby-keyword kw">return</span> <span class="ruby-identifier">bdata</span> <span class="ruby-operator">+</span> <span class="ruby-identifier">buff</span>
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<span class="ruby-keyword kw">end</span></pre>
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