Add prefix support

pkNX.HashDecoderConsole/HashDecoder.cpp

@@ -16,7 +16,7 @@ std::string FnvHashDecoder::BuildString(const size_t length) const
     return { chars.begin(), chars.end() };
 }
 
-std::unordered_map<uint64_t, std::string> FnvHashDecoder::StartDecoding(const int length, const int startChar)
+std::unordered_map<uint64_t, std::string> FnvHashDecoder::StartDecoding(const int length, const int startChar, const std::string_view prefix)
 {
     std::unordered_map<uint64_t, std::string> foundKeys;
 
@@ -24,8 +24,16 @@ std::unordered_map<uint64_t, std::string> FnvHashDecoder::StartDecoding(const in
         0xC75DDBE25402B11C,
     };
 
+    const size_t startIndex = prefix.length();
+
     // Reset all chars to starting point
-    charIndex[0] = (uint32_t)startChar;
+    for (int i = 0; i < prefix.length(); ++i)
+    {
+        const auto& ch = prefix[i];
+        charIndex[i] = AllowedChars.find_first_of(ch);
+    }
+
+    charIndex[startIndex] = (uint32_t)startChar;
 
     // Build the hash of all chars except the last one
     hashBases[0] = kOffsetBasis_64;
@@ -39,7 +47,7 @@ std::unordered_map<uint64_t, std::string> FnvHashDecoder::StartDecoding(const in
     }
 
     //LoopTimer timer{};
-    while (charIndex[0] == startChar)
+    while (charIndex[startIndex] == startChar)
     {
         // Loop through all AllowedChars
         const uint64_t hashBase = hashBases[length - 1];

pkNX.HashDecoderConsole/HashDecoder.h

@@ -5,7 +5,7 @@ namespace pkNXHashDecoder {
     class __declspec(align(64)) FnvHashDecoder
     {
     public:
-        std::unordered_map<uint64_t, std::string> StartDecoding(int length, int startChar);
+        std::unordered_map<uint64_t, std::string> StartDecoding(int length, int startChar, std::string_view prefix);
 
         constexpr static int MAX_LENGTH = 128;
         constexpr static std::string_view AllowedChars = "etaoinshrdlcumw_0123456789fgypbvkjxqz/."; // Sorted by most common first