crc: Provide both crc16 and crc32 seprarately

Signed-off-by: Siddharth Chandrasekaran <sidcha.dev@gmail.com>

Author: sidcha

include/utils/crc.h include/utils/crc16.hinclude/utils/crc.h renamed to include/utils/crc16.h

@@ -1,5 +1,5 @@
-#ifndef _UTILS_CRC32_H_
-#define _UTILS_CRC32_H_
+#ifndef _UTILS_CRC16_H_
+#define _UTILS_CRC16_H_
 
 #include <stdint.h>
 #include <stddef.h>
@@ -18,10 +18,8 @@ uint16_t crc16_itu_t(uint16_t seed, const uint8_t *src, size_t len);
 
 #endif
 
-uint32_t compute_crc32(uint32_t seed, const uint8_t *buffer, size_t length);
-
 #ifdef __cplusplus
 }
 #endif
 
-#endif /* _UTILS_CRC32_H_ */
+#endif /* _UTILS_CRC16_H_ */

include/utils/crc32.h

@@ -0,0 +1,17 @@
+#ifndef _UTILS_CRC32_H_
+#define _UTILS_CRC32_H_
+
+#include <stdint.h>
+#include <stddef.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+uint32_t compute_crc32(uint32_t seed, const uint8_t *buffer, size_t length);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _UTILS_CRC32_H_ */

src/crc16.c

@@ -0,0 +1,21 @@
+/*
+ * Copyright (c) 2025 Siddharth Chandrasekaran <sidcha.dev@gmail.com>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <stdint.h>
+#include <stdlib.h>
+
+/* From Zephyr, to retain the same name */
+uint16_t crc16_itu_t(uint16_t seed, const uint8_t *src, size_t len)
+{
+	for (; len > 0; len--) {
+		seed = (seed >> 8U) | (seed << 8U);
+		seed ^= *src++;
+		seed ^= (seed & 0xffU) >> 4U;
+		seed ^= seed << 12U;
+		seed ^= (seed & 0xffU) << 5U;
+	}
+	return seed;
+}

src/crc.c src/crc32.csrc/crc.c renamed to src/crc32.c

@@ -42,7 +42,7 @@
  * CRC32 code derived from work by Gary S. Brown.
  */
 
-#include <utils/crc.h>
+#include <utils/crc32.h>
 
 const uint32_t crc32_tab[] = {
 	0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
@@ -748,17 +748,3 @@ uint32_t compute_crc32(uint32_t seed, const uint8_t *buffer, size_t length)
 		return (multitable_crc32c(seed, buffer, length));
 	}
 }
-
-/* --- CRC-16 --- */
-
-uint16_t crc16_itu_t(uint16_t seed, const uint8_t *src, size_t len)
-{
-	for (; len > 0; len--) {
-		seed = (seed >> 8U) | (seed << 8U);
-		seed ^= *src++;
-		seed ^= (seed & 0xffU) >> 4U;
-		seed ^= seed << 12U;
-		seed ^= (seed & 0xffU) << 5U;
-	}
-	return seed;
-}