merged 2.2 branch

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@7748 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

utils/Install/sfxace/uac_crc.c

@@ -0,0 +1,36 @@
+/* ------------------------------------------------------------------------ */
+/*                                                                          */
+/*      CRC-calculation routines.                                           */
+/*                                                                          */
+/* ------------------------------------------------------------------------ */
+
+#include "uac_crc.h"
+
+
+ULONG crctable[256];
+ULONG rd_crc=0;
+
+
+void make_crctable(void)   // initializes CRC table
+{
+	ULONG r,
+	i,
+	j;
+
+	for (i = 0; i <= 255; i++)
+	{
+		for (r = i, j = 8; j; j--)
+			r = (r & 1) ? (r >> 1) ^ CRCPOLY : (r >> 1);
+		crctable[i] = r;
+	}
+}
+
+// Updates crc from addr till addr+len-1
+//
+ULONG getcrc(ULONG crc, UCHAR * addr, INT len)
+{
+	while (len--)
+		crc = crctable[(unsigned char) crc ^ (*addr++)] ^ (crc >> 8);
+	return (crc);
+}
+