Added espcrc32builder.h

CMakeLists.txt

@@ -1,5 +1,6 @@
 set(headers
     src/asyncudplistener.h
+    src/espcrc32builder.h
     src/esprandom.h
     src/lockhelper.h
     src/lockingqueue.h

src/espcrc32builder.h

@@ -0,0 +1,32 @@
+#pragma once
+
+// esp-idf includes
+#include <esp32/rom/crc.h>
+
+namespace espcpputils {
+
+class EspCrc32Builder
+{
+public:
+    std::size_t write(uint8_t c)
+    {
+        return write(&c, 1);
+    }
+
+    std::size_t write(const uint8_t *buf, std::size_t len)
+    {
+        crc = crc32_le(crc, buf, len);
+
+        return len;
+    };
+
+    uint32_t hash() const
+    {
+        return crc;
+    }
+
+private:
+    uint32_t crc{};
+};
+
+} // namespace espcpputils