rewrite and reoganize tools functions

* create stdext namespace which contains additional C++ algorithms
* organize stdext in string, math, cast and exception utilities

src/framework/stdext/math.h

@@ -0,0 +1,89 @@
+/*
+ * Copyright (c) 2010-2012 OTClient <https://github.com/edubart/otclient>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef STDEXT_MATH_H
+#define STDEXT_MATH_H
+
+#include "types.h"
+#include <random>
+
+namespace stdext {
+
+inline uint32 generate_adler_checksum(uint8 *buffer, uint16 size) {
+    register uint32 a = 1, b = 0, tlen;
+    while(size > 0) {
+        tlen = size > 5552 ? 5552 : size;
+        size -= tlen;
+        do {
+            a += *buffer++;
+            b += a;
+        } while (--tlen);
+
+        a %= 65521;
+        b %= 65521;
+    }
+    return (b << 16) | a;
+}
+
+inline bool is_power_of_two(uint32 v) {
+    return ((v != 0) && !(v & (v - 1)));
+}
+
+inline uint32 to_power_of_two(uint32 v) {
+    if(v == 0)
+        return 0;
+    uint32 r = 1;
+    while(r < v && r != 0xffffffff)
+        r <<= 1;
+    return r;
+}
+
+inline uint16 readLE16(uchar *addr) { return (uint16)addr[1] << 8 | addr[0]; }
+inline uint32 readLE32(uchar *addr) { return (uint32)readLE16(addr + 2) << 16 | readLE16(addr); }
+inline uint64 readLE64(uchar *addr) { return (uint64)readLE32(addr + 4) << 32 | readLE32(addr); }
+
+inline void writeLE16(uchar *addr, uint16 value) { addr[1] = value >> 8; addr[0] = (uint8)value; }
+inline void writeLE32(uchar *addr, uint32 value) { writeLE16(addr + 2, value >> 16); writeLE16(addr, (uint16)value); }
+inline void writeLE64(uchar *addr, uint64 value) { writeLE16(addr + 4, value >> 32); writeLE32(addr, (uint32)value); }
+
+template<typename T>
+T random_range(T min, T max);
+
+template<>
+inline int random_range<int>(int min, int max) {
+    static std::random_device rd;
+    static std::mt19937 gen(rd());
+    static std::uniform_int_distribution<int> dis(0, 2147483647);
+    return min + (dis(gen) % (max - min + 1));
+}
+
+template<>
+inline float random_range<float>(float min, float max) {
+    static std::random_device rd;
+    static std::mt19937 gen(rd());
+    static std::uniform_real_distribution<float> dis(0.0, 1.0);
+    return min + (max - min)*dis(gen);
+}
+
+}
+
+#endif