proper cmake

src/chunkers/srcs/Buzhash.cpp

@@ -0,0 +1,34 @@
+//
+// Created by Stepan Usatiuk on 26.04.2023.
+//
+
+#include "../includes/Buzhash.h"
+
+Buzhash::Buzhash(uint32_t blockSize) : blockSize(blockSize), history() {}
+
+uint32_t Buzhash::get() const {
+    return cur;
+}
+
+uint32_t Buzhash::feed(uint8_t in) {
+    cur = rotr32(cur, 1);
+
+    if (history.size() >= blockSize) {
+        auto oldest = history.back();
+        history.pop_back();
+        cur ^= rotr32(randomNumbers[oldest], blockSize);
+    }
+
+    history.emplace_front(in);
+
+    cur ^= randomNumbers[in];
+
+    return cur;
+}
+
+// Circular shift taken from: https://en.wikipedia.org/wiki/Circular_shift
+uint32_t Buzhash::rotr32(uint32_t value, unsigned int count) {
+    const unsigned int mask = CHAR_BIT * sizeof(value) - 1;
+    count &= mask;
+    return (value >> count) | (value << (-count & mask));
+}