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plistifier/lib/cfpropertylist/doc/classes/CFPropertyList/Binary.src/M000018.html
Jeena Paradies 2bba8c5fee first commit
2010-06-12 17:59:50 +02:00

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<title>load (CFPropertyList::Binary)</title>
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<pre><span class="ruby-comment cmt"># File rbBinaryCFPropertyList.rb, line 13</span>
<span class="ruby-keyword kw">def</span> <span class="ruby-identifier">load</span>(<span class="ruby-identifier">opts</span>)
<span class="ruby-ivar">@unique_table</span> = {}
<span class="ruby-ivar">@count_objects</span> = <span class="ruby-value">0</span>
<span class="ruby-ivar">@string_size</span> = <span class="ruby-value">0</span>
<span class="ruby-ivar">@int_size</span> = <span class="ruby-value">0</span>
<span class="ruby-ivar">@misc_size</span> = <span class="ruby-value">0</span>
<span class="ruby-ivar">@object_refs</span> = <span class="ruby-value">0</span>
<span class="ruby-ivar">@written_object_count</span> = <span class="ruby-value">0</span>
<span class="ruby-ivar">@object_table</span> = []
<span class="ruby-ivar">@object_ref_size</span> = <span class="ruby-value">0</span>
<span class="ruby-ivar">@offsets</span> = []
<span class="ruby-identifier">fd</span> = <span class="ruby-keyword kw">nil</span>
<span class="ruby-keyword kw">if</span>(<span class="ruby-identifier">opts</span>.<span class="ruby-identifier">has_key?</span>(<span class="ruby-identifier">:file</span>)) <span class="ruby-keyword kw">then</span>
<span class="ruby-identifier">fd</span> = <span class="ruby-constant">File</span>.<span class="ruby-identifier">open</span>(<span class="ruby-identifier">opts</span>[<span class="ruby-identifier">:file</span>],<span class="ruby-value str">&quot;rb&quot;</span>)
<span class="ruby-identifier">file</span> = <span class="ruby-identifier">opts</span>[<span class="ruby-identifier">:file</span>]
<span class="ruby-keyword kw">else</span>
<span class="ruby-identifier">fd</span> = <span class="ruby-constant">StringIO</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">opts</span>[<span class="ruby-identifier">:data</span>],<span class="ruby-value str">&quot;rb&quot;</span>)
<span class="ruby-identifier">file</span> = <span class="ruby-value str">&quot;&lt;string&gt;&quot;</span>
<span class="ruby-keyword kw">end</span>
<span class="ruby-comment cmt"># first, we read the trailer: 32 byte from the end</span>
<span class="ruby-identifier">fd</span>.<span class="ruby-identifier">seek</span>(<span class="ruby-value">-32</span>,<span class="ruby-constant">IO</span><span class="ruby-operator">::</span><span class="ruby-constant">SEEK_END</span>)
<span class="ruby-identifier">buff</span> = <span class="ruby-identifier">fd</span>.<span class="ruby-identifier">read</span>(<span class="ruby-value">32</span>)
<span class="ruby-identifier">offset_size</span>, <span class="ruby-identifier">object_ref_size</span>, <span class="ruby-identifier">number_of_objects</span>, <span class="ruby-identifier">top_object</span>, <span class="ruby-identifier">table_offset</span> = <span class="ruby-identifier">buff</span>.<span class="ruby-identifier">unpack</span> <span class="ruby-value str">&quot;x6CCx4Nx4Nx4N&quot;</span>
<span class="ruby-comment cmt"># after that, get the offset table</span>
<span class="ruby-identifier">fd</span>.<span class="ruby-identifier">seek</span>(<span class="ruby-identifier">table_offset</span>, <span class="ruby-constant">IO</span><span class="ruby-operator">::</span><span class="ruby-constant">SEEK_SET</span>)
<span class="ruby-identifier">coded_offset_table</span> = <span class="ruby-identifier">fd</span>.<span class="ruby-identifier">read</span>(<span class="ruby-identifier">number_of_objects</span> <span class="ruby-operator">*</span> <span class="ruby-identifier">offset_size</span>)
<span class="ruby-identifier">raise</span> <span class="ruby-constant">CFFormatError</span>.<span class="ruby-identifier">new</span>(<span class="ruby-node">&quot;#{file}: Format error!&quot;</span>) <span class="ruby-keyword kw">unless</span> <span class="ruby-identifier">coded_offset_table</span>.<span class="ruby-identifier">bytesize</span> <span class="ruby-operator">==</span> <span class="ruby-identifier">number_of_objects</span> <span class="ruby-operator">*</span> <span class="ruby-identifier">offset_size</span>
<span class="ruby-ivar">@count_objects</span> = <span class="ruby-identifier">number_of_objects</span>
<span class="ruby-comment cmt"># decode offset table</span>
<span class="ruby-identifier">formats</span> = [<span class="ruby-value str">&quot;&quot;</span>,<span class="ruby-value str">&quot;C*&quot;</span>,<span class="ruby-value str">&quot;n*&quot;</span>,<span class="ruby-value str">&quot;(H6)*&quot;</span>,<span class="ruby-value str">&quot;N*&quot;</span>]
<span class="ruby-ivar">@offsets</span> = <span class="ruby-identifier">coded_offset_table</span>.<span class="ruby-identifier">unpack</span>(<span class="ruby-identifier">formats</span>[<span class="ruby-identifier">offset_size</span>])
<span class="ruby-keyword kw">if</span>(<span class="ruby-identifier">offset_size</span> <span class="ruby-operator">==</span> <span class="ruby-value">3</span>) <span class="ruby-keyword kw">then</span>
<span class="ruby-value">0</span>.<span class="ruby-identifier">upto</span>(<span class="ruby-ivar">@offsets</span>.<span class="ruby-identifier">count</span><span class="ruby-operator">-</span><span class="ruby-value">1</span>) { <span class="ruby-operator">|</span><span class="ruby-identifier">i</span><span class="ruby-operator">|</span> <span class="ruby-ivar">@offsets</span>[<span class="ruby-identifier">i</span>] = <span class="ruby-ivar">@offsets</span>[<span class="ruby-identifier">i</span>].<span class="ruby-identifier">to_i</span>(<span class="ruby-value">16</span>) }
<span class="ruby-keyword kw">end</span>
<span class="ruby-ivar">@object_ref_size</span> = <span class="ruby-identifier">object_ref_size</span>
<span class="ruby-identifier">val</span> = <span class="ruby-identifier">read_binary_object_at</span>(<span class="ruby-identifier">file</span>,<span class="ruby-identifier">fd</span>,<span class="ruby-identifier">top_object</span>)
<span class="ruby-identifier">fd</span>.<span class="ruby-identifier">close</span>
<span class="ruby-keyword kw">return</span> <span class="ruby-identifier">val</span>
<span class="ruby-keyword kw">end</span></pre>
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