--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/crc32-table.c	Mon Feb 09 01:15:00 2026 -0500
@@ -0,0 +1,58 @@
+#include "crc32i.h"
+
+/* This builds our CRC table at compile-time rather than runtime.
+ * Note: We should have a way to change the polynomial at runtime too. */
+
+#define CRC32_MASK(crc) (-((crc) & 1))
+
+/* Does one iteration of the 8-time loop to generate one byte of the CRC table. */
+#define CRC32_PRECALC_EX(crc) (((crc) >> 1) ^ ((CRC32_POLYNOMIAL) & CRC32_MASK(crc)))
+
+/* Does all eight iterations of the loop to generate one byte. */
+#define CRC32_PRECALC_E(byte) \
+	(CRC32_PRECALC_EX(CRC32_PRECALC_EX(CRC32_PRECALC_EX(CRC32_PRECALC_EX(CRC32_PRECALC_EX(CRC32_PRECALC_EX(CRC32_PRECALC_EX(CRC32_PRECALC_EX(byte)))))))))
+
+/* Simple wrapper of CRC32_PRECALC_E that converts everything to uint32_t */
+#define CRC32_PRECALC(byte) \
+	CRC32_PRECALC_E((uint32_t)(byte))
+
+#define CRC32_PRECALC_0(byte) \
+	CRC32_PRECALC(byte), CRC32_PRECALC((byte) | 0x01)
+
+#define CRC32_PRECALC_1(byte) \
+	CRC32_PRECALC_0(byte), CRC32_PRECALC_0((byte) | UINT32_C(0x02))
+
+#define CRC32_PRECALC_2(byte) \
+	CRC32_PRECALC_1(byte), CRC32_PRECALC_1((byte) | UINT32_C(0x04))
+
+#define CRC32_PRECALC_3(byte) \
+	CRC32_PRECALC_2(byte), CRC32_PRECALC_2((byte) | UINT32_C(0x08))
+
+#define CRC32_PRECALC_4(byte) \
+	CRC32_PRECALC_3(byte), CRC32_PRECALC_3((byte) | UINT32_C(0x10))
+
+#define CRC32_PRECALC_5(byte) \
+	CRC32_PRECALC_4(byte), CRC32_PRECALC_4((byte) | UINT32_C(0x20))
+
+#define CRC32_PRECALC_6(byte) \
+	CRC32_PRECALC_5(byte), CRC32_PRECALC_5((byte) | UINT32_C(0x40))
+
+#define CRC32_PRECALC_7(byte) \
+	CRC32_PRECALC_6(byte), CRC32_PRECALC_6((byte) | UINT32_C(0x80))
+
+const uint32_t crc32_tab[256] = {
+	CRC32_PRECALC_7(0)
+};
+
+#undef CRC32_MASK
+#undef CRC32_PRECALC_EX
+#undef CRC32_PRECALC_E
+#undef CRC32_PRECALC
+#undef CRC32_PRECALC_0
+#undef CRC32_PRECALC_1
+#undef CRC32_PRECALC_2
+#undef CRC32_PRECALC_3
+#undef CRC32_PRECALC_4
+#undef CRC32_PRECALC_5
+#undef CRC32_PRECALC_6
+#undef CRC32_PRECALC_7