1 files changed, 66 insertions, 0 deletions

diff --git a/code/utility.cpp b/code/utility.cpp
new file mode 100644
index 0000000..aa50e9f
--- /dev/null
+++ b/code/utility.cpp
@@ -0,0 +1,66 @@
+#include "utility.h"
+
+int VarIntRead(unsigned char *data, size_t &readed) {
+    readed = 0;
+    int result = 0;
+    char read;
+    do {
+        read = data[readed];
+        int value = (read & 0b01111111);
+        result |= (value << (7 * readed));
+
+        readed++;
+        if (readed > 5) {
+            throw "VarInt is too big";
+        }
+    } while ((read & 0b10000000) != 0);
+
+    return result;
+}
+
+size_t VarIntWrite(unsigned int value, unsigned char *data) {
+    size_t len = 0;
+    do {
+        unsigned char temp = (unsigned char) (value & 0b01111111);
+        value >>= 7;
+        if (value != 0) {
+            temp |= 0b10000000;
+        }
+        data[len] = temp;
+        len++;
+    } while (value != 0);
+    return len;
+}
+
+long long int ReadVarLong(unsigned char *data, int &readed) {
+    readed = 0;
+    long long result = 0;
+    unsigned char read;
+    do {
+        read = data[readed];
+        long long value = (read & 0b01111111);
+        result |= (value << (7 * readed));
+
+        readed++;
+        if (readed > 10) {
+            throw "VarLong is too big";
+        }
+    } while ((read & 0b10000000) != 0);
+    return result;
+}
+
+unsigned char *WriteVarLong(unsigned long long int value, int &len) {
+    unsigned char *data = new unsigned char[10];
+    len = 0;
+    do {
+        unsigned char temp = (unsigned char) (value & 0b01111111);
+        value >>= 7;
+        if (value != 0) {
+            temp |= 0b10000000;
+        }
+        data[len] = temp;
+        len++;
+    } while (value != 0);
+
+    return data;
+}
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