From 81700c2bcc8084b0d558b1c653fe9a6dd2978d71 Mon Sep 17 00:00:00 2001
From: 0xFEEDC0DE64 <daniel@brunner.ninja>
Date: Mon, 22 Feb 2021 03:47:55 +0100
Subject: [PATCH] Added espcrc32builder.h

---
 CMakeLists.txt        |  1 +
 src/espcrc32builder.h | 32 ++++++++++++++++++++++++++++++++
 2 files changed, 33 insertions(+)
 create mode 100644 src/espcrc32builder.h

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 704449a..3a2b175 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,5 +1,6 @@
 set(headers
     src/asyncudplistener.h
+    src/espcrc32builder.h
     src/esprandom.h
     src/lockhelper.h
     src/lockingqueue.h
diff --git a/src/espcrc32builder.h b/src/espcrc32builder.h
new file mode 100644
index 0000000..b4e9445
--- /dev/null
+++ b/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