1 files changed, 69 insertions, 0 deletions
diff --git a/src/libs/7zip/win/C/XzCrc64Opt.c b/src/libs/7zip/win/C/XzCrc64Opt.c
new file mode 100644
index 000000000..dccae1c19
--- /dev/null
+++ b/src/libs/7zip/win/C/XzCrc64Opt.c
@@ -0,0 +1,69 @@
+/* XzCrc64Opt.c -- CRC64 calculation
+2011-06-28 : Igor Pavlov : Public domain */
+
+#include "Precomp.h"
+
+#include "CpuArch.h"
+
+#define CRC_UPDATE_BYTE_2(crc, b) (table[((crc) ^ (b)) & 0xFF] ^ ((crc) >> 8))
+
+#ifndef MY_CPU_BE
+
+UInt64 MY_FAST_CALL XzCrc64UpdateT4(UInt64 v, const void *data, size_t size, const UInt64 *table)
+{
+  const Byte *p = (const Byte *)data;
+  for (; size > 0 && ((unsigned)(ptrdiff_t)p & 3) != 0; size--, p++)
+    v = CRC_UPDATE_BYTE_2(v, *p);
+  for (; size >= 4; size -= 4, p += 4)
+  {
+    UInt32 d = (UInt32)v ^ *(const UInt32 *)p;
+    v = (v >> 32) ^
+      table[0x300 + ((d      ) & 0xFF)] ^
+      table[0x200 + ((d >>  8) & 0xFF)] ^
+      table[0x100 + ((d >> 16) & 0xFF)] ^
+      table[0x000 + ((d >> 24))];
+  }
+  for (; size > 0; size--, p++)
+    v = CRC_UPDATE_BYTE_2(v, *p);
+  return v;
+}
+
+#endif
+
+
+#ifndef MY_CPU_LE
+
+#define CRC_UINT64_SWAP(v) \
+  ((v >> 56) | \
+  ((v >> 40) & ((UInt64)0xFF <<  8)) | \
+  ((v >> 24) & ((UInt64)0xFF << 16)) | \
+  ((v >>  8) & ((UInt64)0xFF << 24)) | \
+  ((v <<  8) & ((UInt64)0xFF << 32)) | \
+  ((v << 24) & ((UInt64)0xFF << 40)) | \
+  ((v << 40) & ((UInt64)0xFF << 48)) | \
+   (v << 56))
+
+UInt64 MY_FAST_CALL XzCrc64UpdateT1_BeT4(UInt64 v, const void *data, size_t size, const UInt64 *table)
+{
+  const Byte *p = (const Byte *)data;
+  for (; size > 0 && ((unsigned)(ptrdiff_t)p & 3) != 0; size--, p++)
+    v = CRC_UPDATE_BYTE_2(v, *p);
+  v = CRC_UINT64_SWAP(v);
+  table += 0x100;
+  for (; size >= 4; size -= 4, p += 4)
+  {
+    UInt32 d = (UInt32)(v >> 32) ^ *(const UInt32 *)p;
+    v = (v << 32) ^
+      table[0x000 + ((d      ) & 0xFF)] ^
+      table[0x100 + ((d >>  8) & 0xFF)] ^
+      table[0x200 + ((d >> 16) & 0xFF)] ^
+      table[0x300 + ((d >> 24))];
+  }
+  table -= 0x100;
+  v = CRC_UINT64_SWAP(v);
+  for (; size > 0; size--, p++)
+    v = CRC_UPDATE_BYTE_2(v, *p);
+  return v;
+}
+
+#endif