Initial commit

game_payload/include/crc32.h

@@ -0,0 +1,24 @@
+#pragma once
+
+// Modified from https://stackoverflow.com/a/27950866
+
+#include <stddef.h>
+#include <stdint.h>
+
+/* CRC-32C (iSCSI) polynomial in reversed bit order. */
+#define __POLY 0x82f63b78
+
+static inline uint32_t crc32c(uint32_t crc, const unsigned char *buf, size_t len) {
+    crc = ~crc;
+
+    while (len--) {
+        crc ^= *buf++;
+        for (int k = 0; k < 8; k++) {
+            crc = crc & 1 ? (crc >> 1) ^ __POLY : crc >> 1;
+        }
+    }
+
+    return ~crc;
+}
+
+#undef __POLY