M000558.html in ripxplore-0.17.1

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-  <title>sectors_per_granule (TrsDos)</title>
+  <title>files (TrsDos)</title>
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-  <pre><span class="ruby-comment cmt"># File lib/file_systems/TrsDos.rb, line 66</span>
-<span class="ruby-keyword kw">def</span> <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">sectors_per_granule</span>(<span class="ruby-identifier">file_system_image</span>)
-  <span class="ruby-value">5</span>
+  <pre><span class="ruby-comment cmt"># File lib/file_systems/TrsDos.rb, line 76</span>
+<span class="ruby-keyword kw">def</span> <span class="ruby-keyword kw">self</span>.<span class="ruby-identifier">files</span>(<span class="ruby-identifier">file_system_image</span>)
+  <span class="ruby-identifier">files</span>=<span class="ruby-constant">FileContainer</span>.<span class="ruby-identifier">new</span>
+  <span class="ruby-identifier">granule_allocation_table</span>=<span class="ruby-identifier">file_system_image</span>.<span class="ruby-identifier">get_sector</span>(<span class="ruby-identifier">directory_track</span>,<span class="ruby-value">0</span>)
+  <span class="ruby-keyword kw">return</span> <span class="ruby-identifier">files</span> <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">granule_allocation_table</span>.<span class="ruby-identifier">nil?</span>
+  <span class="ruby-identifier">file_system_image</span>.<span class="ruby-identifier">volume_name</span>=<span class="ruby-identifier">granule_allocation_table</span>[<span class="ruby-value">0xd0</span>,<span class="ruby-value">8</span>].<span class="ruby-identifier">unpack</span>(<span class="ruby-value str">&quot;A*&quot;</span>)
+  (<span class="ruby-identifier">file_system_image</span>.<span class="ruby-identifier">sectors_in_track</span>(<span class="ruby-identifier">directory_track</span>)<span class="ruby-operator">-</span>[<span class="ruby-value">0</span>,<span class="ruby-value">1</span>]).<span class="ruby-identifier">each</span> <span class="ruby-keyword kw">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">sector_no</span><span class="ruby-operator">|</span>
+    <span class="ruby-identifier">fde_sector</span>=<span class="ruby-identifier">file_system_image</span>.<span class="ruby-identifier">get_sector</span>(<span class="ruby-identifier">directory_track</span>,<span class="ruby-identifier">sector_no</span>)
+    (<span class="ruby-identifier">fde_sector</span>.<span class="ruby-identifier">length</span><span class="ruby-operator">/</span><span class="ruby-constant">FDE_SIZE</span>).<span class="ruby-identifier">times</span> <span class="ruby-keyword kw">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">fde_number</span><span class="ruby-operator">|</span>
+      <span class="ruby-identifier">fde</span>=<span class="ruby-identifier">fde_sector</span>[<span class="ruby-identifier">fde_number</span><span class="ruby-operator">*</span><span class="ruby-constant">FDE_SIZE</span>,<span class="ruby-constant">FDE_SIZE</span>]
+      <span class="ruby-identifier">attributes</span>=<span class="ruby-identifier">fde</span>[<span class="ruby-value">0x00</span>]
+      
+      <span class="ruby-comment cmt">#for a valid FPDE, bit 7 is 0 and bite 4 is 1
</span>
+      <span class="ruby-identifier">is_fpde</span>  = ((<span class="ruby-identifier">attributes</span> <span class="ruby-operator">&amp;</span> <span class="ruby-value">0</span><span class="ruby-identifier">b10010000</span>)<span class="ruby-operator">==</span>(<span class="ruby-value">0</span><span class="ruby-identifier">b00010000</span>))
+      <span class="ruby-keyword kw">next</span> <span class="ruby-keyword kw">if</span> <span class="ruby-operator">!</span><span class="ruby-identifier">is_fpde</span> 
+      <span class="ruby-identifier">eof_low</span>=<span class="ruby-identifier">fde</span>[<span class="ruby-value">0x03</span>]
+      <span class="ruby-identifier">filename_base</span>=<span class="ruby-identifier">fde</span>[<span class="ruby-value">0x05</span>,<span class="ruby-value">8</span>].<span class="ruby-identifier">unpack</span>(<span class="ruby-value str">&quot;A8&quot;</span>)
+      <span class="ruby-identifier">filename_extension</span>=<span class="ruby-identifier">fde</span>[<span class="ruby-value">0x0</span><span class="ruby-constant">D</span>,<span class="ruby-value">3</span>].<span class="ruby-identifier">unpack</span>(<span class="ruby-value str">&quot;A3&quot;</span>)
+      <span class="ruby-identifier">filename</span>=<span class="ruby-node">&quot;#{filename_base}/#{filename_extension}&quot;</span>
+      <span class="ruby-identifier">contents</span>=<span class="ruby-value str">&quot;&quot;</span>
+      <span class="ruby-identifier">eof_mid</span>=<span class="ruby-identifier">fde</span>[<span class="ruby-value">0x14</span>]
+      <span class="ruby-identifier">eof_high</span>=<span class="ruby-identifier">fde</span>[<span class="ruby-value">0x15</span>]
+      <span class="ruby-identifier">file_length</span>=(<span class="ruby-identifier">eof_high</span><span class="ruby-operator">&lt;&lt;</span><span class="ruby-value">16</span>)<span class="ruby-operator">+</span>(<span class="ruby-identifier">eof_mid</span><span class="ruby-operator">&lt;&lt;</span><span class="ruby-value">8</span>)<span class="ruby-operator">+</span><span class="ruby-identifier">eof_low</span>
+      <span class="ruby-keyword kw">if</span> (<span class="ruby-identifier">eof_low</span><span class="ruby-operator">&gt;</span><span class="ruby-value">0</span>) <span class="ruby-keyword kw">then</span>
+        <span class="ruby-identifier">file_length</span><span class="ruby-operator">-=</span><span class="ruby-value">0x100</span>
+      <span class="ruby-keyword kw">end</span>
+<span class="ruby-comment cmt"># byte $16 - $1F : 5 pairs of extent elements, each pair made up of:
</span>
+<span class="ruby-comment cmt">#     byte $00 : if $FF, then end of extent elements for this file. if $FE, then next byte contains the DEC for the first (or next) FXDE assigned to this file.
</span>
+<span class="ruby-comment cmt">#                     any other value ($00-$FD) equals the number of the diskette's lump in which the area starts. 
</span>
+<span class="ruby-comment cmt">#     byte $01  : bits 7-5 = number of granules (0-7) from the start of the lump to the start of the area
</span>
+<span class="ruby-comment cmt">#                   : bits 4- 0 = number less one of contiguous granules assigned to this area.
</span>
+
+      <span class="ruby-value">5</span>.<span class="ruby-identifier">times</span> <span class="ruby-keyword kw">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">extent_no</span><span class="ruby-operator">|</span>
+        <span class="ruby-identifier">extent</span>=<span class="ruby-identifier">fde</span>[(<span class="ruby-identifier">extent_no</span><span class="ruby-operator">*</span><span class="ruby-value">2</span>)<span class="ruby-operator">+</span><span class="ruby-value">0x16</span>,<span class="ruby-value">2</span>]
+        <span class="ruby-keyword kw">break</span> <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">extent</span>[<span class="ruby-value">0</span>]<span class="ruby-operator">==</span><span class="ruby-value">0x</span><span class="ruby-constant">FF</span>
+        <span class="ruby-comment cmt">#raise &quot;FXDE's not implemented yet&quot; if extent[0]==0xFE
</span>
+        <span class="ruby-keyword kw">break</span> <span class="ruby-keyword kw">if</span> <span class="ruby-identifier">extent</span>[<span class="ruby-value">0</span>]<span class="ruby-operator">==</span><span class="ruby-value">0x</span><span class="ruby-constant">FE</span> <span class="ruby-comment cmt"># &quot;FXDE's not implemented yet&quot;
</span>
+        <span class="ruby-identifier">track_no</span>=<span class="ruby-identifier">extent</span>[<span class="ruby-value">0</span>]
+        <span class="ruby-identifier">granule_offset</span>=<span class="ruby-identifier">extent</span>[<span class="ruby-value">1</span>]<span class="ruby-operator">&gt;&gt;</span><span class="ruby-value">5</span>
+        <span class="ruby-identifier">number_of_granules</span>=<span class="ruby-value">1</span><span class="ruby-operator">+</span>(<span class="ruby-identifier">extent</span>[<span class="ruby-value">1</span>] <span class="ruby-operator">&amp;</span> <span class="ruby-value">0</span><span class="ruby-identifier">b00011111</span>)
+        <span class="ruby-identifier">start_sector</span>=<span class="ruby-identifier">granule_offset</span><span class="ruby-operator">*</span><span class="ruby-identifier">sectors_per_granule</span>(<span class="ruby-identifier">file_system_image</span>)
+        <span class="ruby-identifier">number_of_sectors</span>=<span class="ruby-identifier">number_of_granules</span><span class="ruby-operator">*</span><span class="ruby-identifier">sectors_per_granule</span>(<span class="ruby-identifier">file_system_image</span>)
+        <span class="ruby-identifier">number_of_sectors</span>.<span class="ruby-identifier">times</span> {<span class="ruby-operator">|</span><span class="ruby-identifier">i</span><span class="ruby-operator">|</span> <span class="ruby-identifier">contents</span><span class="ruby-operator">&lt;&lt;</span><span class="ruby-identifier">file_system_image</span>.<span class="ruby-identifier">get_sector</span>(<span class="ruby-identifier">track_no</span>,<span class="ruby-identifier">start_sector</span><span class="ruby-operator">+</span><span class="ruby-identifier">i</span>)}        
+      <span class="ruby-keyword kw">end</span>
+      <span class="ruby-identifier">contents</span>=<span class="ruby-identifier">contents</span>[<span class="ruby-value">0</span>,<span class="ruby-identifier">file_length</span>]
+      <span class="ruby-identifier">files</span><span class="ruby-operator">&lt;&lt;</span><span class="ruby-constant">NativeFileType</span>.<span class="ruby-identifier">best_fit</span>(<span class="ruby-identifier">file_system_image</span>,<span class="ruby-identifier">filename</span>,<span class="ruby-identifier">contents</span>,<span class="ruby-identifier">filename_extension</span>)      
+    <span class="ruby-keyword kw">end</span>
+  <span class="ruby-keyword kw">end</span>
+  <span class="ruby-identifier">files</span>
 <span class="ruby-keyword kw">end</span></pre>
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