Refactoring

dotnet/WhiteRabbit/Program.cs

@@ -24,11 +24,10 @@
             stopwatch.Start();
 
             var sourcePhrase = ConfigurationManager.AppSettings["SourcePhrase"];
-            var sourceChars = ToOrderedChars(sourcePhrase);
 
             var maxWordsInPhrase = int.Parse(ConfigurationManager.AppSettings["MaxWordsInPhrase"]);
 
-            if (sourceChars.Length + maxWordsInPhrase > 28)
+            if (sourcePhrase.Where(ch => ch != ' ').Count() + maxWordsInPhrase > 28)
             {
                 Console.WriteLine("Only anagrams of up to 27 characters (including whitespace) are allowed");
                 return;
@@ -78,27 +77,14 @@
 
             stopwatch.Restart();
 
-            processor.CheckPhrases(phraseSet => ProcessPhraseSet(phraseSet, expectedHashesFirstComponents, stopwatch));
-
-            Console.WriteLine($"Done; time from start: {stopwatch.Elapsed}");
-        }
-
-        private static void ProcessPhraseSet(PhraseSet phraseSet, Vector<uint> expectedHashesFirstComponents, Stopwatch stopwatch)
+            processor.CheckPhrases(expectedHashesFirstComponents, (phraseBytes, hashFirstComponent) =>
             {
-            phraseSet.ComputeMD5();
-            for (var i = 0; i < Constants.PhrasesPerSet; i++)
-            {
-                /*Debug.Assert(
-                    sourceChars == ToOrderedChars(ToString(phraseSet, i)),
-                    $"StringsProcessor produced incorrect anagram: {ToString(phraseSet, i)}");*/
+                var phrase = Encoding.ASCII.GetString(phraseBytes);
+                var hash = ComputeFullMD5(phraseBytes);
+                Console.WriteLine($"Found phrase for {hash} ({hashFirstComponent:x8}): {phrase}; time from start is {stopwatch.Elapsed}");
+            });
 
-                if (Vector.EqualsAny(expectedHashesFirstComponents, new Vector<uint>(phraseSet.GetMD5(i))))
-                {
-                    var phrase = ToString(phraseSet, i);
-                    var hash = ComputeFullMD5(phrase);
-                    Console.WriteLine($"Found phrase for {hash} ({phraseSet.GetMD5(i):x8}): {phrase}; time from start is {stopwatch.Elapsed}");
-                }
-            }
+            Console.WriteLine($"Done; time from start: {stopwatch.Elapsed}");
         }
 
         // Code taken from http://stackoverflow.com/a/321404/831314
@@ -112,9 +98,8 @@
         }
 
         // We can afford to spend some time here; this code will only run for matched phrases (and for one in several billion non-matched)
-        private static string ComputeFullMD5(string phrase)
+        private static string ComputeFullMD5(byte[] phraseBytes)
         {
-            var phraseBytes = Encoding.ASCII.GetBytes(phrase);
             using (var hashAlgorithm = new MD5CryptoServiceProvider())
             {
                 var resultBytes = hashAlgorithm.ComputeHash(phraseBytes);
@@ -127,11 +112,6 @@
             return hex.Substring(6, 2) + hex.Substring(4, 2) + hex.Substring(2, 2) + hex.Substring(0, 2);
         }
 
-        private static string ToString(PhraseSet phrase, int offset)
-        {
-            return Encoding.ASCII.GetString(phrase.GetBytes(offset));
-        }
-
         private static IEnumerable<byte[]> ReadInput()
         {
             string line;
@@ -140,10 +120,5 @@
                 yield return Encoding.ASCII.GetBytes(line);
             }
         }
-
-        private static string ToOrderedChars(string source)
-        {
-            return new string(source.Where(ch => ch != ' ').OrderBy(ch => ch).ToArray());
-        }
     }
 }

dotnet/WhiteRabbit/StringsProcessor.cs

@@ -3,6 +3,7 @@
     using System;
     using System.Collections.Generic;
     using System.Linq;
+    using System.Numerics;
     using System.Threading.Tasks;
 
     internal sealed class StringsProcessor
@@ -60,13 +61,13 @@
 
         private int NumberOfCharacters { get; }
 
-        public void CheckPhrases(Action<PhraseSet> action)
+        public void CheckPhrases(Vector<uint> expectedHashes, Action<byte[], uint> action)
         {
             // task of finding anagrams could be reduced to the task of finding sequences of dictionary vectors with the target sum
             var sums = this.VectorsProcessor.GenerateSequences();
 
             // converting sequences of vectors to the sequences of words...
-            Parallel.ForEach(sums, new ParallelOptions { MaxDegreeOfParallelism = Constants.NumberOfThreads }, sum => ProcessSum(sum, action));
+            Parallel.ForEach(sums, new ParallelOptions { MaxDegreeOfParallelism = Constants.NumberOfThreads }, sum => ProcessSum(sum, expectedHashes, action));
         }
 
         public long GetPhrasesCount()
@@ -118,24 +119,31 @@
             return result;
         }
 
-        private void ProcessSum(int[] sum, Action<PhraseSet> action)
+        private void ProcessSum(int[] sum, Vector<uint> expectedHashes, Action<byte[], uint> action)
         {
             var initialPhraseSet = new PhraseSet();
             initialPhraseSet.Init();
             initialPhraseSet.FillLength(this.NumberOfCharacters, sum.Length);
             var phraseSet = new PhraseSet();
             phraseSet.Init();
-            var filter = ComputeFilter(sum);
+            var permutationsFilter = ComputeFilter(sum);
             var wordsVariants = this.ConvertVectorsToWordIndexes(sum);
             foreach (var wordsArray in Flattener.Flatten(wordsVariants))
             {
                 //Console.WriteLine(new string(wordsArray.SelectMany(wordIndex => this.AllWords[wordIndex].Original).Select(b => (char)b).ToArray()));
 
-                var permutations = PrecomputedPermutationsGenerator.HamiltonianPermutations(wordsArray.Length, filter);
+                var permutations = PrecomputedPermutationsGenerator.HamiltonianPermutations(wordsArray.Length, permutationsFilter);
                 for (var i = 0; i < permutations.Length; i += Constants.PhrasesPerSet)
                 {
                     phraseSet.FillPhraseSet(initialPhraseSet, this.AllWords, wordsArray, permutations, i);
-                    action(phraseSet);
+                    phraseSet.ComputeMD5();
+                    for (var j = 0; j < Constants.PhrasesPerSet; j++)
+                    {
+                        if (Vector.EqualsAny(expectedHashes, new Vector<uint>(phraseSet.GetMD5(j))))
+                        {
+                            action(phraseSet.GetBytes(j), phraseSet.GetMD5(j));
+                        }
+                    }
                 }
             }
         }