diff --git a/types.h b/types.h
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+/*
+  Copyright 2013 Google LLC All rights reserved.
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at:
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+*/
+
+
+/*
+   american fuzzy lop - type definitions and minor macros
+   ------------------------------------------------------
+
+   Written and maintained by Michal Zalewski <lcamtuf@google.com>
+*/
+
+#ifndef _HAVE_TYPES_H
+#define _HAVE_TYPES_H
+
+#include <stdint.h>
+#include <stdlib.h>
+
+typedef uint8_t  u8;
+typedef uint16_t u16;
+typedef uint32_t u32;
+
+/*
+
+   Ugh. There is an unintended compiler / glibc #include glitch caused by
+   combining the u64 type an %llu in format strings, necessitating a workaround.
+
+   In essence, the compiler is always looking for 'unsigned long long' for %llu.
+   On 32-bit systems, the u64 type (aliased to uint64_t) is expanded to
+   'unsigned long long' in <bits/types.h>, so everything checks out.
+
+   But on 64-bit systems, it is #ifdef'ed in the same file as 'unsigned long'.
+   Now, it only happens in circumstances where the type happens to have the
+   expected bit width, *but* the compiler does not know that... and complains
+   about 'unsigned long' being unsafe to pass to %llu.
+
+ */
+
+#ifdef __x86_64__
+typedef unsigned long long u64;
+#else
+typedef uint64_t u64;
+#endif /* ^__x86_64__ */
+
+typedef int8_t   s8;
+typedef int16_t  s16;
+typedef int32_t  s32;
+typedef int64_t  s64;
+
+#ifndef MIN
+#  define MIN(_a,_b) ((_a) > (_b) ? (_b) : (_a))
+#  define MAX(_a,_b) ((_a) > (_b) ? (_a) : (_b))
+#endif /* !MIN */
+
+#define SWAP16(_x) ({ \
+    u16 _ret = (_x); \
+    (u16)((_ret << 8) | (_ret >> 8)); \
+  })
+
+#define SWAP32(_x) ({ \
+    u32 _ret = (_x); \
+    (u32)((_ret << 24) | (_ret >> 24) | \
+          ((_ret << 8) & 0x00FF0000) | \
+          ((_ret >> 8) & 0x0000FF00)); \
+  })
+
+#ifdef AFL_LLVM_PASS
+#  define AFL_R(x) (random() % (x))
+#else
+#  define R(x) (random() % (x))
+#endif /* ^AFL_LLVM_PASS */
+
+#define STRINGIFY_INTERNAL(x) #x
+#define STRINGIFY(x) STRINGIFY_INTERNAL(x)
+
+#define MEM_BARRIER() \
+  __asm__ volatile("" ::: "memory")
+
+#define likely(_x)   __builtin_expect(!!(_x), 1)
+#define unlikely(_x)  __builtin_expect(!!(_x), 0)
+
+#endif /* ! _HAVE_TYPES_H */