X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=lib%2Fcrc8.c;h=55f7c07285cd3baf32612eaaf44fbed167a1ffcf;hb=98c0d49c3d52a44fd27648cdb7107632bb5f2600;hp=8b68a29e40be79d95c85ce88c9c6bd65b643a1be;hpb=33d413fc91e0bbbb92962a80f5333d6f1f628c5b;p=oweals%2Fu-boot.git

diff --git a/lib/crc8.c b/lib/crc8.c
index 8b68a29e40..55f7c07285 100644
--- a/lib/crc8.c
+++ b/lib/crc8.c
@@ -1,25 +1,31 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * Copyright (c) 2013 Google, Inc
- *
- * SPDX-License-Identifier:	GPL-2.0+
  */
 
 #include "linux/crc8.h"
 
-unsigned int crc8(const unsigned char *vptr, int len)
+#define POLY	(0x1070U << 3)
+
+static unsigned char _crc8(unsigned short data)
 {
-	const unsigned char *data = vptr;
-	unsigned int crc = 0;
-	int i, j;
-
-	for (j = len; j; j--, data++) {
-		crc ^= (*data << 8);
-		for (i = 8; i; i--) {
-			if (crc & 0x8000)
-				crc ^= (0x1070 << 3);
-			crc <<= 1;
-		}
+	int i;
+
+	for (i = 0; i < 8; i++) {
+		if (data & 0x8000)
+			data = data ^ POLY;
+		data = data << 1;
 	}
 
-	return (crc >> 8) & 0xff;
+	return (unsigned char)(data >> 8);
+}
+
+unsigned int crc8(unsigned int crc, const unsigned char *vptr, int len)
+{
+	int i;
+
+	for (i = 0; i < len; i++)
+		crc = _crc8((crc ^ vptr[i]) << 8);
+
+	return crc;
 }