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<!--Weave of 'Interactive Fiction ID' generated by 7-->
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<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../compiler.html">Inform7 Modules</a></li><li><a href="index.html">if</a></li><li><a href="index.html#2">Chapter 2: Bibliographic Data</a></li><li><b>Interactive Fiction ID</b></li></ul><p class="purpose">Computes and makes available the IFID (Interactive Fiction ID) number for an Inform-generated work of IF, in compliance with the Treaty of Babel.</p>
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<ul class="toc"><li><a href="#SP1">§1. Definitions</a></li></ul><hr class="tocbar">
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<p class="inwebparagraph"><a id="SP1"></a><b>§1. Definitions. </b></p>
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<p class="inwebparagraph"><a id="SP2"></a><b>§2. </b>The Interactive Fiction ID number for an Inform 7-compiled work is the
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same as the UUID unique ID generated by the Inform 7 application.
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</p>
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<p class="inwebparagraph">UUIDs are not generated here, but by the user interface application: we expect
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to read them in the form of the <code class="display"><span class="extract">uuid.txt</span></code> file placed in the project bundle
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by that application. After some agonising, I decided that the Treaty did not
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actually oblige me to crash out if this file did not exist: but in such
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cases the UUID is empty.
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</p>
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<pre class="definitions">
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<span class="definitionkeyword">define</span> <span class="constant">MAX_UUID_LENGTH</span><span class="plain"> </span><span class="constant">128</span><span class="plain"> </span><span class="comment"> the UUID is truncated to this if necessary</span>
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</pre>
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<pre class="display">
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<span class="identifier">text_stream</span><span class="plain"> *</span><span class="identifier">uuid_text</span><span class="plain"> = </span><span class="identifier">NULL</span><span class="plain">;</span>
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<span class="reserved">int</span><span class="plain"> </span><span class="identifier">uuid_read</span><span class="plain"> = -1;</span>
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<span class="identifier">text_stream</span><span class="plain"> *</span><span class="functiontext">PL::Bibliographic::IFID::read_uuid<button class="popup" onclick="togglePopup('usagePopup2')">...<span class="popuptext" id="usagePopup2">Usage of <b>PL::Bibliographic::IFID::read_uuid</b>:<br><a href="#SP3">§3</a>, Bibliographic Data - <a href="2-bd.html#SP11">§11</a><br>Release Instructions - <a href="2-ri.html#SP11_1_1">§11.1.1</a>, <a href="2-ri.html#SP14_2_5">§14.2.5</a></span></button></span><span class="plain">(</span><span class="reserved">void</span><span class="plain">) {</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">uuid_read</span><span class="plain"> >= </span><span class="constant">0</span><span class="plain">) </span><span class="reserved">return</span><span class="plain"> </span><span class="identifier">uuid_text</span><span class="plain">;</span>
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<span class="identifier">uuid_text</span><span class="plain"> = </span><span class="identifier">Str::new</span><span class="plain">();</span>
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<span class="identifier">uuid_read</span><span class="plain"> = </span><span class="constant">0</span><span class="plain">;</span>
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<span class="reserved">FILE</span><span class="plain"> *</span><span class="identifier">xf</span><span class="plain"> = </span><span class="identifier">Filenames::fopen</span><span class="plain">(</span><span class="identifier">Task::uuid_file</span><span class="plain">(), </span><span class="string">"r"</span><span class="plain">);</span>
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<span class="reserved">if</span><span class="plain"> (</span><span class="identifier">xf</span><span class="plain"> == </span><span class="identifier">NULL</span><span class="plain">) </span><span class="reserved">return</span><span class="plain"> </span><span class="identifier">uuid_text</span><span class="plain">; </span><span class="comment"> the UUID is the empty string if the file is missing</span>
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<span class="reserved">int</span><span class="plain"> </span><span class="identifier">c</span><span class="plain">;</span>
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<span class="reserved">while</span><span class="plain"> (((</span><span class="identifier">c</span><span class="plain"> = </span><span class="identifier">fgetc</span><span class="plain">(</span><span class="identifier">xf</span><span class="plain">)) != </span><span class="identifier">EOF</span><span class="plain">) </span><span class="comment"> the UUID file is plain text, not Unicode</span>
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<span class="plain">&& (</span><span class="identifier">uuid_read</span><span class="plain">++ < </span><span class="constant">MAX_UUID_LENGTH</span><span class="plain">-1))</span>
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<span class="identifier">PUT_TO</span><span class="plain">(</span><span class="identifier">uuid_text</span><span class="plain">, </span><span class="identifier">Characters::toupper</span><span class="plain">(</span><span class="identifier">c</span><span class="plain">));</span>
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<span class="identifier">fclose</span><span class="plain">(</span><span class="identifier">xf</span><span class="plain">);</span>
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<span class="reserved">return</span><span class="plain"> </span><span class="identifier">uuid_text</span><span class="plain">;</span>
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<span class="plain">}</span>
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</pre>
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<p class="inwebparagraph"></p>
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<p class="inwebparagraph"><a id="SP3"></a><b>§3. </b>The IFID is written into the compiled story file, too, both in order
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that it can be printed by the VERSION command and to brand the file so
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that it can still be identified even if it loses touch with its iFiction
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record. We store the IFID in plain text, with a "magic string" identifier
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around it, in byte-accessible memory.
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</p>
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<pre class="display">
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<span class="reserved">void</span><span class="plain"> </span><span class="functiontext">PL::Bibliographic::IFID::define_UUID<button class="popup" onclick="togglePopup('usagePopup3')">...<span class="popuptext" id="usagePopup3">Usage of <b>PL::Bibliographic::IFID::define_UUID</b>:<br>none</span></button></span><span class="plain">(</span><span class="reserved">void</span><span class="plain">) {</span>
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<span class="identifier">text_stream</span><span class="plain"> *</span><span class="identifier">uuid</span><span class="plain"> = </span><span class="functiontext"><a href="#SP2">PL::Bibliographic::IFID::read_uuid</a></span><span class="plain">();</span>
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<span class="identifier">inter_name</span><span class="plain"> *</span><span class="identifier">UUID_array_iname</span><span class="plain"> = </span><span class="identifier">Hierarchy::find</span><span class="plain">(</span><span class="identifier">UUID_ARRAY_HL</span><span class="plain">);</span>
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<span class="identifier">Emit::named_string_constant</span><span class="plain">(</span><span class="identifier">UUID_array_iname</span><span class="plain">, </span><span class="identifier">uuid</span><span class="plain">);</span>
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<span class="identifier">Hierarchy::make_available</span><span class="plain">(</span><span class="identifier">Emit::tree</span><span class="plain">(), </span><span class="identifier">UUID_array_iname</span><span class="plain">);</span>
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<span class="plain">}</span>
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<span class="identifier">inter_name</span><span class="plain"> *</span><span class="functiontext">PL::Bibliographic::IFID::UUID<button class="popup" onclick="togglePopup('usagePopup4')">...<span class="popuptext" id="usagePopup4">Usage of <b>PL::Bibliographic::IFID::UUID</b>:<br>none</span></button></span><span class="plain">(</span><span class="reserved">void</span><span class="plain">) {</span>
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<span class="reserved">return</span><span class="plain"> </span><span class="identifier">Hierarchy::find</span><span class="plain">(</span><span class="identifier">UUID_ARRAY_HL</span><span class="plain">);</span>
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<span class="plain">}</span>
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</pre>
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<p class="inwebparagraph"></p>
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<hr class="tocbar">
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<ul class="toc"><li><i>(This section begins Chapter 2: Bibliographic Data.)</i></li><li><a href="2-bd.html">Continue with 'Bibliographic Data'</a></li></ul><hr class="tocbar">
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