Add getRandom to tools

2 files changed, 16 insertions, 0 deletions

diff --git a/include/tools.h b/include/tools.h
index 5855374..78dd683 100644
--- a/include/tools.h
+++ b/include/tools.h
@@ -53,4 +53,12 @@ namespace libtp::tools
      *  @return One of the CARD_RESULT Constants (CARD_RESULT_READY, ...)
      */
     int32_t ReadGCI( int32_t chan, const char* fileName, int32_t length, int32_t offset, void* buffer );
+
+    /**
+     * @brief Generates a random number based on a seed and a maximum number
+     * 
+     * @param seed A reference to the seed that's being used
+     * @param max The maximum number to be generated by the function
+     */
+    uint32_t getRandom(uint64_t* seed,uint32_t max);
 }     // namespace libtp::tools
\ No newline at end of file
diff --git a/source/tools.cpp b/source/tools.cpp
index 42cb205..dd5895b 100644
--- a/source/tools.cpp
+++ b/source/tools.cpp
@@ -133,4 +133,12 @@ namespace libtp::tools
 
         return result;
     }
+
+    uint32_t getRandom(uint64_t* seed,uint32_t max){
+        uint64_t z = (*seed += 0x9e3779b97f4a7c15);
+		z = (z ^ (z >> 30)) * 0xbf58476d1ce4e5b9;
+		z = (z ^ (z >> 27)) * 0x94d049bb133111eb;
+
+		return (z % max);
+    }
 }     // namespace libtp::tools
\ No newline at end of file