first commit

ProtoGen/ProtoUtil.cpp

@@ -0,0 +1,32 @@
+#include "ProtoUtil.h"
+
+size_t varint_length(uint32_t v) {
+    if (v == 0) return 1;
+
+    size_t logcounter = 0;
+    while (v > 0) {
+        ++logcounter;
+        v >>= 7;
+    }
+    return logcounter;
+}
+
+size_t encode_varint(std::vector<uint8_t>& dst, uint32_t value) {
+    constexpr uint8_t MSB = 0b10000000;
+
+    uint32_t n = value;
+    size_t i = 0;
+
+    while (n >= 0x80) {
+        dst.push_back(MSB | static_cast<uint8_t>(n & 0x7F));
+        ++i;
+        n >>= 7;
+    }
+
+    dst.push_back(static_cast<uint8_t>(n));
+    return i + 1;
+}
+
+uint32_t pack_wire_tag(uint32_t field_id, uint8_t wire_type) {
+    return (field_id << 3) | static_cast<uint32_t>(wire_type);
+}