moved RNG to common/util.cpp

svn-id: r5778

2 files changed, 36 insertions, 0 deletions

diff --git a/common/util.cpp b/common/util.cpp
index cea9d3a8f0..2423cd0af0 100644
--- a/common/util.cpp
+++ b/common/util.cpp
@@ -157,3 +157,27 @@ int resStrLen(const char *src)
 	}
 	return num;
 }
+
+RandomSource::RandomSource(uint32 seed)
+{
+	_randSeed = seed;
+}
+
+void RandomSource::setSeed(uint32 seed)
+{
+	_randSeed = seed;
+}
+
+uint RandomSource::getRandomNumber(uint max)
+{
+	/* TODO: my own random number generator */
+	_randSeed = 0xDEADBF03 * (_randSeed + 1);
+	_randSeed = (_randSeed >> 13) | (_randSeed << 19);
+	return _randSeed % (max + 1);
+}
+
+uint RandomSource::getRandomNumberRng(uint min, uint max)
+{
+	return getRandomNumber(max - min) + min;
+}
+
diff --git a/common/util.h b/common/util.h
index 37576bd8af..a5e13c0e4f 100644
--- a/common/util.h
+++ b/common/util.h
@@ -72,4 +72,16 @@ void hexdump(const byte * data, int len);
 // Resource string length
 int resStrLen(const char *src);
 
+
+class RandomSource {
+private:
+	uint32 _randSeed;
+
+public:
+	RandomSource(uint32 seed = 0xA943DE33);
+	void setSeed(uint32 seed);
+	uint getRandomNumber(uint max);
+	uint getRandomNumberRng(uint min, uint max);
+};
+
 #endif