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display5: config: Reduce rootfs2 (BACKUP) size from 1528M to 512M
[oweals/u-boot.git]
/
lib
/
crc8.c
diff --git
a/lib/crc8.c
b/lib/crc8.c
index 8b68a29e40be79d95c85ce88c9c6bd65b643a1be..55f7c07285cd3baf32612eaaf44fbed167a1ffcf 100644
(file)
--- a/
lib/crc8.c
+++ b/
lib/crc8.c
@@
-1,25
+1,31
@@
+// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2013 Google, Inc
/*
* Copyright (c) 2013 Google, Inc
- *
- * SPDX-License-Identifier: GPL-2.0+
*/
#include "linux/crc8.h"
*/
#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;
}
}