Check in crc_init needed by cksum. (Oops.)

1 files changed, 15 insertions, 0 deletions

diff --git a/lib/lib.c b/lib/lib.c
index 8f742894..f94d6fdf 100644
--- a/lib/lib.c
+++ b/lib/lib.c
@@ -718,3 +718,18 @@ void replace_tempfile(int fdin, int fdout, char **tempname)
 	free(temp);
 	*tempname = NULL;
 }
+
+// Create a 256 entry CRC32 lookup table.
+
+void crc_init(unsigned int *crc_table)
+{
+	unsigned int i;
+
+	// Init the CRC32 table (big endian)
+	for (i=0; i<256; i++) {
+		unsigned int j, c = i<<24;
+		for (j=8; j; j--)
+			c=c&0x80000000 ? (c<<1)^0x04c11db7 : (c<<1);
+		crc_table[i] = c;
+	}
+}