Lightly modified commit of lzma sdk version 9.20.
The only change from stock lzma sdk is the removal of two
.exe files, which we don't need.
Change-Id: I46287cbc416161e93b449761ebe531acd758cf95
diff --git a/C/XzCrc64.c b/C/XzCrc64.c
new file mode 100755
index 0000000..f688b07
--- /dev/null
+++ b/C/XzCrc64.c
@@ -0,0 +1,33 @@
+/* XzCrc64.c -- CRC64 calculation
+2010-04-16 : Igor Pavlov : Public domain */
+
+#include "XzCrc64.h"
+
+#define kCrc64Poly UINT64_CONST(0xC96C5795D7870F42)
+UInt64 g_Crc64Table[256];
+
+void MY_FAST_CALL Crc64GenerateTable(void)
+{
+ UInt32 i;
+ for (i = 0; i < 256; i++)
+ {
+ UInt64 r = i;
+ int j;
+ for (j = 0; j < 8; j++)
+ r = (r >> 1) ^ ((UInt64)kCrc64Poly & ~((r & 1) - 1));
+ g_Crc64Table[i] = r;
+ }
+}
+
+UInt64 MY_FAST_CALL Crc64Update(UInt64 v, const void *data, size_t size)
+{
+ const Byte *p = (const Byte *)data;
+ for (; size > 0 ; size--, p++)
+ v = CRC64_UPDATE_BYTE(v, *p);
+ return v;
+}
+
+UInt64 MY_FAST_CALL Crc64Calc(const void *data, size_t size)
+{
+ return CRC64_GET_DIGEST(Crc64Update(CRC64_INIT_VAL, data, size));
+}