1 files changed, 62 insertions, 0 deletions
diff --git a/old/botan/build/botan/bswap.h b/old/botan/build/botan/bswap.h
new file mode 100644
index 0000000..ec1e814
--- /dev/null
+++ b/old/botan/build/botan/bswap.h
@@ -0,0 +1,62 @@
+/*
+* Byte Swapping Operations
+* (C) 1999-2008 Jack Lloyd
+* (C) 2007 Yves Jerschow
+*
+* Distributed under the terms of the Botan license
+*/
+
+#ifndef BOTAN_BYTE_SWAP_H__
+#define BOTAN_BYTE_SWAP_H__
+
+#include <botan/types.h>
+#include <botan/rotate.h>
+
+namespace Botan {
+
+/*
+* Byte Swapping Functions
+*/
+inline u16bit reverse_bytes(u16bit input)
+   {
+   return rotate_left(input, 8);
+   }
+
+inline u32bit reverse_bytes(u32bit input)
+   {
+#if BOTAN_USE_GCC_INLINE_ASM && \
+    (defined(BOTAN_TARGET_ARCH_IS_IA32) || defined(BOTAN_TARGET_ARCH_IS_AMD64))
+
+   /* GCC-style inline assembly for x86 or x86-64 */
+   asm("bswapl %0" : "=r" (input) : "0" (input));
+   return input;
+
+#elif defined(_MSC_VER) && defined(BOTAN_TARGET_ARCH_IS_IA32)
+   /* Visual C++ inline asm for 32-bit x86, by Yves Jerschow */
+   __asm mov eax, input;
+   __asm bswap eax;
+
+#else
+   /* Generic implementation */
+   input = ((input & 0xFF00FF00) >> 8) | ((input & 0x00FF00FF) << 8);
+   return rotate_left(input, 16);
+#endif
+   }
+
+inline u64bit reverse_bytes(u64bit input)
+   {
+#if BOTAN_USE_GCC_INLINE_ASM && defined(BOTAN_TARGET_ARCH_IS_AMD64)
+   asm("bswapq %0" : "=r" (input) : "0" (input));
+   return input;
+#else
+   u32bit hi = ((input >> 40) & 0x00FF00FF) | ((input >> 24) & 0xFF00FF00);
+   u32bit lo = ((input & 0xFF00FF00) >> 8) | ((input & 0x00FF00FF) << 8);
+   hi = (hi << 16) | (hi >> 16);
+   lo = (lo << 16) | (lo >> 16);
+   return (static_cast<u64bit>(lo) << 32) | hi;
+#endif
+   }
+
+}
+
+#endif