Invocation: change TestFrame to use a dedicated header

Change data layout to place a metadata record ''behind the'' payload data,
and add a checksum to allow for validating dummy calculations and also
detect data corruption on data modified after initial generation.

By virtue of a marker data word, the presence of a valid metadata record can be confirmed.

src/lib/hash-value.h

@@ -33,7 +33,7 @@
 #include <stdlib.h>
 
 
-/** 
+/**
  * storage for a Lumiera unique ID,
  * based on a 128bit random number
  */

tests/core/steam/engine/testframe.cpp

@@ -18,12 +18,13 @@
 
 #include "lib/error.hpp"
 #include "lib/random.hpp"
+#include "lib/hash-standard.hpp"
+#include "lib/hash-combine.hpp"
 #include "steam/engine/testframe.hpp"
 #include "lib/nocopy.hpp"
 #include "lib/util.hpp"
 
 #include <climits>
-#include <cstring>
 #include <memory>
 #include <vector>
 
@@ -33,10 +34,8 @@ namespace steam {
 namespace engine {
 namespace test   {
   
-  using lib::HashVal;
+  using util::unConst;
   using std::vector;
-  using std::memcpy;
-  using lib::rani;
   
   /** @note using a random-congruential engine to generate the payload data */
   using PseudoRandom = lib::RandomSequencer<std::minstd_rand>;
@@ -69,14 +68,16 @@ namespace test   {
     HashVal dataSeed{drawSeed(lib::entropyGen)};
     
     /** @internal helper for generating unique test frames.
-     * This "discriminator" is used as a random seed when filling the test frame data buffers.
+     * This »discriminator« is used as a random seed when filling the test frame data buffers.
      * It is generated to be very likely different on adjacent frames of the same series,
      * as well as to differ to all nearby neighbouring channels.
+     * @note the #dataSeed hash is limited by #SEQUENCE_SPREAD to prevent „risky“ families;
+     *   the extreme case would be dataSeed+family ≡ 0 (all frames would be equal then)
      * @param seq the sequence number of the frame within the channel
      * @param family the channel this frame belongs to
      */
     uint64_t
-    generateDistinction(uint seq, uint family)
+    generateDiscriminator(uint seq, uint family)
     {
       // use the family as stepping
       return (seq+1) * (dataSeed+family);
@@ -99,6 +100,15 @@ namespace test   {
           }
       };
     
+    /** @return a stable characteristic memory marker for the metadata record */
+    HashVal
+    stampHeader()
+    {
+      static const HashVal MARK = lib::entropyGen.hash()
+                                | 0b1000'1000'1000'1000'1000'1000'1000'1000;
+      return MARK;
+    }
+    
     /** @internal build a PRNG starting from the referred fixed seed */
     auto
     buildDataGenFrom (uint64_t const& anchor)
@@ -225,43 +235,68 @@ namespace test   {
   
   /* ===== TestFrame class ===== */
   
+  TestFrame::Meta::Meta (uint seq, uint family)
+    : _MARK_{stampHeader()}
+    , checksum{0}
+    , distinction{generateDiscriminator (seq,family)}
+    , stage{CREATED}
+    { }
+  
   TestFrame::~TestFrame()
     {
-      stage_ = DISCARDED;
+      header_.stage = DISCARDED;
     }
   
   
-  TestFrame::TestFrame(uint seq, uint family)
+  TestFrame::TestFrame (uint seq, uint family)
-    : distinction_(generateDistinction (seq,family))
+    : header_{seq,family}
-    , stage_(CREATED)
     {
-      ASSERT (0 < distinction_);
+      ASSERT (0 < header_.distinction);
-      buildData();
+      header_.checksum = buildData();
+      ENSURE (CREATED == header_.stage);
+      ENSURE (isPristine());
     }
   
   
   TestFrame::TestFrame (TestFrame const& o)
-    : distinction_(o.distinction_)
+    : header_{o.header_}
-    , stage_(CREATED)
     {
-      memcpy (buffer_, o.buffer_, BUFFSIZ);
+      data() = o.data();
+      header_.stage = CREATED;
     }
   
   TestFrame&
   TestFrame::operator= (TestFrame const& o)
     {
-      if (DISCARDED == stage_)
+      if (not isAlive())
-        throw new error::Logic ("target TestFrame is already dead");
+        throw new error::Logic ("target TestFrame already dead or unaccessible");
       if (not util::isSameAdr (this, o))
         {
-          distinction_ = o.distinction_;
+          data() = o.data();
-          stage_ = CREATED;
+          header_ = o.header_;
-          memcpy (buffer_, o.buffer_, BUFFSIZ);
+          header_.stage = CREATED;
         }
       return *this;
     }
   
   
+  TestFrame::Meta&
+  TestFrame::accessHeader()
+  {
+    return header_;
+  }
+  TestFrame::Meta const&
+  TestFrame::accessHeader()  const
+  {
+    ///////////////////////OOO detect if valid header present and else throw
+    return unConst(this)->accessHeader();
+  }
+  
+  TestFrame::StageOfLife
+  TestFrame::currStage()  const
+  {
+    ///////////////////////OOO detect if valid header present and then access
+  }
   
   /** @note performing an unchecked conversion of the given
    *        memory location to be accessed as TestFrame.
@@ -301,47 +336,74 @@ namespace test   {
     return true;
   }
   
+  
+  HashVal
+  TestFrame::buildData()
+  {
+    auto gen = buildDataGenFrom (accessHeader().distinction);
+    for (uint i=0; i<BUFFSIZ; ++i)
+      data()[i] = char(gen.i(CHAR_MAX));
+  }
+  
   bool
   TestFrame::verifyData()  const
   {
-    auto gen = buildDataGenFrom (distinction_);
+    auto gen = buildDataGenFrom (accessHeader().distinction);
     for (uint i=0; i<BUFFSIZ; ++i)
       if (data()[i] != char(gen.i(CHAR_MAX)))
         return false;
     return true;
   }
   
-  void
+  HashVal
-  TestFrame::buildData()
+  TestFrame::computeChecksum()  const
   {
-    auto gen = buildDataGenFrom (distinction_);
+    HashVal hash{0};
-    for (uint i=0; i<BUFFSIZ; ++i)
+    ////////////////////////////////////////////OOO actually compute it
-      data()[i] = char(gen.i(CHAR_MAX));
   }
   
+  bool
+  TestFrame::hasValidChecksum()  const
+  {
+    ////////////////////////////////////////////OOO actually compute checksum and verify
+  }
   
   bool
   TestFrame::isAlive() const
   {
-    return (CREATED == stage_)
+    return (CREATED == currStage())
-        || (EMITTED == stage_);
+        || (EMITTED == currStage());
   }
   
   bool
   TestFrame::isDead()  const
   {
-    return (DISCARDED == stage_);
+    return (DISCARDED == currStage());
   }
   
   bool
   TestFrame::isSane()  const
   {
-    return ( (CREATED == stage_)
+    return ( (CREATED == currStage())
-           ||(EMITTED == stage_)
+           ||(EMITTED == currStage())
-           ||(DISCARDED == stage_))
+           ||(DISCARDED == currStage()))
         && verifyData();
   }
   
+  bool
+  TestFrame::isValid()  const
+  {
+    return isSane()
+       and hasValidChecksum();
+  }
+  
+  bool
+  TestFrame::isPristine()  const
+  {
+    return isSane()
+       and hasValidChecksum();
+  }
+  
   
   
 }}} // namespace steam::engine::test

tests/core/steam/engine/testframe.hpp

@@ -30,6 +30,7 @@ namespace steam {
 namespace engine {
 namespace test   {
   
+  using lib::HashVal;
   
   /**
    * Mock data frame for simulated rendering.
@@ -58,14 +59,24 @@ namespace test   {
       
       static constexpr size_t BUFFSIZ = 1024;
       using _Arr = std::array<char,BUFFSIZ>;
-      
+
-      uint64_t distinction_;
+      struct Meta
-      StageOfLife stage_;
+        {
+          HashVal _MARK_;
+          HashVal checksum;
+          uint64_t distinction;
+          StageOfLife stage;
+          
+          Meta (uint seq, uint family);
+        };
       
       /** inline storage buffer for the payload media data */
       alignas(uint64_t)
         std::byte buffer_[sizeof(_Arr)];
       
+      /** Metadata record located behind the data buffer */
+      Meta header_;
+      
     public:
       /** discard all cached #testData and recalibrate data generation */
       static void reseed();
@@ -86,9 +97,11 @@ namespace test   {
        *  an already destroyed TestFrame instance */
       static bool isDead (void* memLocation);
       
-      bool isAlive() const;
+      bool isAlive()    const;
-      bool isDead()  const;
+      bool isDead()     const;
-      bool isSane()  const;
+      bool isSane()     const;
+      bool isValid()    const;
+      bool isPristine() const;
       
       bool operator== (void* memLocation) const;
       
@@ -102,7 +115,12 @@ namespace test   {
     private:
       bool contentEquals (TestFrame const& o)  const;
       bool verifyData()  const;
-      void buildData ();
+      HashVal buildData();
+      Meta& accessHeader();
+      Meta const& accessHeader()  const;
+      StageOfLife currStage()  const;
+      HashVal computeChecksum()  const;
+      bool hasValidChecksum()  const;
     };
   
   

wiki/thinkPad.ichthyo.mm

@@ -17766,9 +17766,7 @@
 </html></richcontent>
 <node BACKGROUND_COLOR="#e0ceaa" COLOR="#690f14" CREATED="1664546786666" ID="ID_418065847" MODIFIED="1664546893122" TEXT="links-Klick">
 <richcontent TYPE="NOTE"><html>
-  <head>
+  <head/>
-    
-  </head>
   <body>
     <p>
       Ja, wir wollen das alte Blender-Modell: Selektion mit rechts, Aktion mit links
@@ -18605,9 +18603,7 @@
 <icon BUILTIN="button_ok"/>
 <node CREATED="1664031831907" ID="ID_701574899" MODIFIED="1664031980972" TEXT="Problem: reaktiv getriggert">
 <richcontent TYPE="NOTE"><html>
-  <head>
+  <head/>
-    
-  </head>
   <body>
     <p>
       Bedingt durch das Aufrufschema k&#246;nnen wir nicht zu Beginn steuernd eingreifen, sondern wir k&#246;nnen nur erkennen, wenn das Sub-Widget (aus welchen Gr&#252;nden auch immer) den extension-constraint verletzt. Und wir bekommen keine direkten Wirkfaktoren in die Hand (weil sich die Ausdehnung aus einem komplexen Zusammenspiel von Font, Pixelgr&#246;&#223;e und Styles ergibt)
@@ -18907,9 +18903,7 @@
 </node>
 <node COLOR="#33565a" CREATED="1664725271351" HGAP="38" ID="ID_1918462068" MODIFIED="1664727540441" TEXT="erf&#xfc;llt(cW)?" VSHIFT="-10">
 <richcontent TYPE="NOTE"><html>
-  <head>
+  <head/>
-    
-  </head>
   <body>
     <p>
       BEDINUNG: cW&#160;&gt; aktuelleWeite
@@ -19247,9 +19241,7 @@
 </node>
 <node CREATED="1664836501374" ID="ID_915287836" MODIFIED="1672764716013" TEXT="Kein Problem: Layout-Handling-Code l&#xe4;uft vor dem n&#xe4;chsten DRAW">
 <richcontent TYPE="NOTE"><html>
-  <head>
+  <head/>
-    
-  </head>
   <body>
     <ul>
       <li>
@@ -20064,9 +20056,7 @@
 </node>
 <node COLOR="#435e98" CREATED="1665972100310" ID="ID_1747925228" MODIFIED="1666285341589" TEXT="seltsam? in den bisherigen Experimenten war das nie ein Problem">
 <richcontent TYPE="NOTE"><html>
-  <head>
+  <head/>
-    
-  </head>
   <body>
     <p>
       ...denn ich ging von der Annahme aus, da&#223; dieser Code erst im nachfolgenden draw()-Event aufgerufen wird; und diese Annahme hatte sich bisher stets best&#228;tigt, obwohl im ctor von ElementBox direkt ein show_all() aufgerufen wird
@@ -21315,9 +21305,7 @@
 </node>
 <node CREATED="1575221690053" ID="ID_391530319" MODIFIED="1575221756022" TEXT="genau diese Info aber brauche ich">
 <richcontent TYPE="NOTE"><html>
-  <head>
+  <head/>
-    
-  </head>
   <body>
     <p>
       denn der Display/Manager bzw Canvas ist zwar &quot;quasi global&quot;, aber eben nicht wirklich, denn er ist f&#252;r eine Timeline zust&#228;ndig. Also genau die Art Relation, f&#252;r die man typischerweise DI macht
@@ -24059,9 +24047,7 @@
 </node>
 <node CREATED="1565273005475" ID="ID_1081606131" MODIFIED="1576282358075" TEXT="aber sinnvoll zum Triggern">
 <richcontent TYPE="NOTE"><html>
-  <head>
+  <head/>
-    
-  </head>
   <body>
     <p>
       Es ist sinnvoll, die Feststellung einer &#196;nderung vom Berechnen der neuen Werte zu trennen.
@@ -39574,9 +39560,7 @@
 </node>
 <node COLOR="#338800" CREATED="1621011086402" ID="ID_1715852739" MODIFIED="1621013328247" TEXT="dann m&#xfc;ssen diese aber auch auf das ClipWidget-Interface">
 <richcontent TYPE="NOTE"><html>
-  <head>
+  <head/>
-    
-  </head>
   <body>
     <p>
       letztlich kein Problem.
@@ -41915,9 +41899,7 @@
   </body>
 </html></richcontent>
 <richcontent TYPE="NOTE"><html>
-  <head>
+  <head/>
-    
-  </head>
   <body>
     <p>
       Wir nutzen explizit aus, da&#223; das Ergebnis durch truncating quantisiert wird (Integer-Division). Daher k&#246;nnen wir erst den ersten Dividenden (die Zeitspanne) aufteilen, und zwar erst mal in den Sekunden-Anteil, dann den Rest, und dann den Rest vom Rest
@@ -43225,9 +43207,7 @@
 <node CREATED="1670718042479" ID="ID_1099895360" MODIFIED="1670718073999" TEXT="&#x27f9; dd/dn &lt; 1e-9 wird gef&#xe4;rlich">
 <node CREATED="1670718077402" ID="ID_1523825947" MODIFIED="1670718152194" TEXT="der Vorfaktor ist minimal 1.1 (bzw 2 f&#xfc;r ganze Pixel)">
 <richcontent TYPE="NOTE"><html>
-  <head>
+  <head/>
-    
-  </head>
   <body>
     <p>
       minimale Pixel-Zahl 1px. Mit 1/10 Band dann 1.1, mit 1px-Band 2
@@ -44003,9 +43983,7 @@
 <icon BUILTIN="button_ok"/>
 <node COLOR="#338800" CREATED="1668474155145" ID="ID_132764069" MODIFIED="1668474234849" TEXT="ein Beispiel mit Nenner nahe INT_MAX">
 <richcontent TYPE="NOTE"><html>
-  <head>
+  <head/>
-    
-  </head>
   <body>
     <p>
       Rat poison = (MAXI-88)/(MAXI/7);
@@ -45687,9 +45665,7 @@
 </node>
 <node CREATED="1541552832731" ID="ID_346770424" MODIFIED="1576282358021" TEXT="bricht die Subsidiarit&#xe4;t">
 <richcontent TYPE="NOTE"><html>
-  <head>
+  <head/>
-    
-  </head>
   <body>
     <p>
       ...denn dann m&#252;&#223;te das Attribut
@@ -46019,9 +45995,7 @@
 </node>
 <node CREATED="1523019770144" ID="ID_435980488" MODIFIED="1557498707234">
 <richcontent TYPE="NODE"><html>
-  <head>
+  <head/>
-    
-  </head>
   <body>
     <p>
       (GlobalCtx)-&gt;WindowLocator-&gt;<b>UIComponentAccessor</b>
@@ -46219,9 +46193,7 @@
 </node>
 <node CREATED="1448078473068" ID="ID_510866826" MODIFIED="1576282358017" TEXT="zerst&#xf6;ren">
 <richcontent TYPE="NOTE"><html>
-  <head>
+  <head/>
-    
-  </head>
   <body>
     <p>
       hei&#223;t: Element deregistriert sich am UI-Bus
@@ -46334,9 +46306,7 @@
 <icon BUILTIN="pencil"/>
 <node CREATED="1448078811895" ID="ID_1266803050" MODIFIED="1518487921085">
 <richcontent TYPE="NODE"><html>
-  <head>
+  <head/>
-    
-  </head>
   <body>
     <p>
       Nachricht an <i>irgend ein</i>&#160;Wurzel-Element
@@ -56799,6 +56769,40 @@
 </node>
 <node COLOR="#338800" CREATED="1731900530433" ID="ID_1117088425" MODIFIED="1731900545903" TEXT="den Basis-Seed mit einem minimal-Spread aufbauen">
 <icon BUILTIN="button_ok"/>
+<node CREATED="1731943389399" ID="ID_39230986" MODIFIED="1731943552546">
+<richcontent TYPE="NODE"><html>
+  <head/>
+  <body>
+    <p>
+      Diskriminator-ID &#8788; (<font color="#592cc8">seq</font>+1) * (<font color="#6c433b">dataSeed</font>+<font color="#6f0ed0">family</font>)
+    </p>
+  </body>
+</html>
+</richcontent>
+</node>
+<node CREATED="1731943561624" ID="ID_1209671030" MODIFIED="1731943647377">
+<richcontent TYPE="NODE"><html>
+  <head/>
+  <body>
+    <p>
+      Erl&#228;uterung: jede &#187;family&#171; hat ein eigenes<i>&#160;Stepping</i>
+    </p>
+  </body>
+</html>
+</richcontent>
+</node>
+<node CREATED="1731943679360" ID="ID_1740781453" MODIFIED="1731943717151" TEXT="es kann trotzdem zu Kollisionen kommen &#x2014; das ist aber f&#xfc;r kleine seq-Nr unwahrscheinlich"/>
+<node CREATED="1731943742648" ID="ID_594247384" MODIFIED="1731943827486" TEXT="gef&#xe4;hrlich w&#xe4;re DataSeed sehr klein oder nahe Max-uint">
+<richcontent TYPE="NOTE"><html>
+  <head/>
+  <body>
+    <p>
+      ...weil es dann passieren k&#246;nnte, da&#223; f&#252;r bestimmte Familien die Frames sich nicht mehr unterscheiden
+    </p>
+  </body>
+</html>
+</richcontent>
+</node>
 </node>
 <node COLOR="#338800" CREATED="1731900560669" ID="ID_553408936" MODIFIED="1731900581648" TEXT="diesen aber ansonsten aus dem default / oder entropy-Generator ziehen">
 <icon BUILTIN="button_ok"/>
@@ -56822,6 +56826,12 @@
 <linktarget COLOR="#5b9aaa" DESTINATION="ID_1432722861" ENDARROW="Default" ENDINCLINATION="63;7;" ID="Arrow_ID_1569718697" SOURCE="ID_1990276915" STARTARROW="None" STARTINCLINATION="61;0;"/>
 <icon BUILTIN="button_ok"/>
 </node>
+<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1731944016612" ID="ID_1328551493" MODIFIED="1731944033914" TEXT="definiere Metadaten-Header">
+<icon BUILTIN="flag-yellow"/>
+</node>
+<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1731944023419" ID="ID_799758026" MODIFIED="1731944033915" TEXT="lege diesen hinter die Nutzdaten">
+<icon BUILTIN="flag-yellow"/>
+</node>
 </node>
 <node COLOR="#338800" CREATED="1728787025826" ID="ID_1972770219" MODIFIED="1730835694593" TEXT="Accessor und Iteration">
 <icon BUILTIN="button_ok"/>
@@ -56864,8 +56874,24 @@
 </node>
 </node>
 </node>
+<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1731947552403" ID="ID_604836518" MODIFIED="1731947561332" TEXT="im Header hinterlegen">
+<icon BUILTIN="flag-yellow"/>
+</node>
+<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1731947702842" ID="ID_745455518" MODIFIED="1731947715463" TEXT="pr&#xfc;fen">
+<icon BUILTIN="flag-yellow"/>
+</node>
+</node>
+<node CREATED="1728786979373" ID="ID_772580400" MODIFIED="1728786987393" TEXT="Metadaten-Erkennung">
+<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1731947576264" ID="ID_767046037" MODIFIED="1731947717471" TEXT="Header-Stamp">
+<icon BUILTIN="flag-yellow"/>
+</node>
+<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1731947640352" ID="ID_122461720" MODIFIED="1731947717470" TEXT="Header lokalisieren">
+<icon BUILTIN="flag-yellow"/>
+</node>
+<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1731947651342" ID="ID_1504134040" MODIFIED="1731947717470" TEXT="Plausibilit&#xe4;tspr&#xfc;fung">
+<icon BUILTIN="flag-yellow"/>
+</node>
 </node>
-<node CREATED="1728786979373" ID="ID_772580400" MODIFIED="1728786987393" TEXT="Metadaten-Erkennung"/>
 <node CREATED="1728786988308" ID="ID_103079985" MODIFIED="1728786992576" TEXT="Pr&#xe4;dikate">
 <node CREATED="1728779817892" ID="ID_882765451" MODIFIED="1728779971755" TEXT="isSane">
 <richcontent TYPE="NOTE"><html>
@@ -90423,8 +90449,7 @@ Date:&#160;&#160;&#160;Thu Apr 20 18:53:17 2023 +0200<br/>
       irgendwie binden wir hier einen Handler ein, der &#187;hinten rum&#171; am Lib-Plugin h&#228;ngt und daf&#252;r einen (privaten) Datentyp konstruiert &#10233; <b>diese</b>&#160; Info mu&#223; in den Prototyp eingehen
     </p>
   </body>
-</html>
+</html></richcontent>
-</richcontent>
 <linktarget COLOR="#df0449" DESTINATION="ID_373306612" ENDARROW="Default" ENDINCLINATION="-44;-51;" ID="Arrow_ID_937144137" SOURCE="ID_1126512651" STARTARROW="None" STARTINCLINATION="151;7;"/>
 <icon BUILTIN="messagebox_warning"/>
 </node>
@@ -92295,14 +92320,13 @@ Date:&#160;&#160;&#160;Thu Apr 20 18:53:17 2023 +0200<br/>
       wirft auch den internen Daten-Cache weg und re-seeded den Basis-Hash, auf dem die Distinction-ID dann aufbaut
     </p>
   </body>
-</html>
+</html></richcontent>
-</richcontent>
 </node>
 <node CREATED="1731900805220" ID="ID_1253309363" MODIFIED="1731900819630" TEXT="diese reseed() zieht aus dem defaultGen"/>
 <node CREATED="1731900821242" ID="ID_1140389439" MODIFIED="1731900831764" TEXT="den kann man somit vorher gezielt seeden"/>
 </node>
 </node>
-<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1728781144210" ID="ID_51267004" MODIFIED="1728781989516" TEXT="Standard Generator-Sequenzen auf jeder Stufe sind unabh&#xe4;ngig hierarchisch">
+<node COLOR="#338800" CREATED="1728781144210" ID="ID_51267004" MODIFIED="1731943356338" TEXT="Standard Generator-Sequenzen auf jeder Stufe sind unabh&#xe4;ngig hierarchisch">
 <richcontent TYPE="NOTE"><html>
   <head/>
   <body>
@@ -92311,7 +92335,10 @@ Date:&#160;&#160;&#160;Thu Apr 20 18:53:17 2023 +0200<br/>
     </p>
   </body>
 </html></richcontent>
-<icon BUILTIN="flag-yellow"/>
+<icon BUILTIN="button_ok"/>
+<node COLOR="#435e98" CREATED="1731943358292" ID="ID_619750163" MODIFIED="1731943374281" TEXT="lie&#xdf; sich mit dem neuen &#xbb;Baukasten&#xab; leicht realisieren">
+<icon BUILTIN="ksmiletris"/>
+</node>
 </node>
 </node>
 </node>
@@ -92826,9 +92853,9 @@ Date:&#160;&#160;&#160;Thu Apr 20 18:53:17 2023 +0200<br/>
 </node>
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