crc32: constify arguments

2 files changed, 5 insertions, 3 deletions

diff --git a/crc32.c b/crc32.c
index e07bbed..6e0c87d 100644
--- a/crc32.c
+++ b/crc32.c
@@ -59,9 +59,9 @@ static const uint32_t crc32_table[256] = {
 	0x2d02ef8d
 };
 
-uint32_t crc32(uint32_t crc, uint8_t *buf, size_t len)
+uint32_t crc32(uint32_t crc, const uint8_t *buf, size_t len)
 {
-	uint8_t *end;
+	const uint8_t *end;
 
 	crc = ~crc;
 	for (end = buf + len; buf < end; buf++)
diff --git a/crc32.h b/crc32.h
index 72da4e0..6ea89b0 100644
--- a/crc32.h
+++ b/crc32.h
@@ -1,6 +1,8 @@
 #ifndef _CRC32_H_
 #define _CRC32_H_
 
-extern uint32_t crc32(uint32_t crc, unsigned char *buf, size_t len);
+#include <stdint.h>
+
+extern uint32_t crc32(uint32_t crc, const uint8_t *buf, size_t len);
 
 #endif /* _CRC32_H_ */