Added brotli enc/ and tools/ directories.

third_party/brotli/enc/port.h

+/* Copyright 2013 Google Inc. All Rights Reserved.
+
+   Distributed under MIT license.
+   See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
+*/
+
+// Macros for endianness, branch prediction and unaligned loads and stores.
+
+#ifndef BROTLI_ENC_PORT_H_
+#define BROTLI_ENC_PORT_H_
+
+#include <assert.h>
+#include <string.h>
+#include "./types.h"
+
+#if defined OS_LINUX || defined OS_CYGWIN
+#include <endian.h>
+#elif defined OS_FREEBSD
+#include <machine/endian.h>
+#elif defined OS_MACOSX
+#include <machine/endian.h>
+/* Let's try and follow the Linux convention */
+#define __BYTE_ORDER  BYTE_ORDER
+#define __LITTLE_ENDIAN LITTLE_ENDIAN
+#endif
+
+// define the macro IS_LITTLE_ENDIAN
+// using the above endian definitions from endian.h if
+// endian.h was included
+#ifdef __BYTE_ORDER
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+#define IS_LITTLE_ENDIAN
+#endif
+
+#else
+
+#if defined(__LITTLE_ENDIAN__)
+#define IS_LITTLE_ENDIAN
+#endif
+#endif  // __BYTE_ORDER
+
+#if defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)
+#define IS_LITTLE_ENDIAN
+#endif
+
+// Enable little-endian optimization for x64 architecture on Windows.
+#if (defined(_WIN32) || defined(_WIN64)) && defined(_M_X64)
+#define IS_LITTLE_ENDIAN
+#endif
+
+/* Compatibility with non-clang compilers. */
+#ifndef __has_builtin
+#define __has_builtin(x) 0
+#endif
+
+#if (__GNUC__ > 2) || (__GNUC__ == 2 && __GNUC_MINOR__ > 95) || \
+    (defined(__llvm__) && __has_builtin(__builtin_expect))
+#define PREDICT_FALSE(x) (__builtin_expect(x, 0))
+#define PREDICT_TRUE(x) (__builtin_expect(!!(x), 1))
+#else
+#define PREDICT_FALSE(x) (x)
+#define PREDICT_TRUE(x) (x)
+#endif
+
+// Portable handling of unaligned loads, stores, and copies.
+// On some platforms, like ARM, the copy functions can be more efficient
+// then a load and a store.
+
+#if defined(ARCH_PIII) || \
+  defined(ARCH_ATHLON) || defined(ARCH_K8) || defined(_ARCH_PPC)
+
+// x86 and x86-64 can perform unaligned loads/stores directly;
+// modern PowerPC hardware can also do unaligned integer loads and stores;
+// but note: the FPU still sends unaligned loads and stores to a trap handler!
+
+#define BROTLI_UNALIGNED_LOAD32(_p) (*reinterpret_cast<const uint32_t *>(_p))
+#define BROTLI_UNALIGNED_LOAD64(_p) (*reinterpret_cast<const uint64_t *>(_p))
+
+#define BROTLI_UNALIGNED_STORE32(_p, _val) \
+  (*reinterpret_cast<uint32_t *>(_p) = (_val))
+#define BROTLI_UNALIGNED_STORE64(_p, _val) \
+  (*reinterpret_cast<uint64_t *>(_p) = (_val))
+
+#elif defined(__arm__) && \
+  !defined(__ARM_ARCH_5__) && \
+  !defined(__ARM_ARCH_5T__) && \
+  !defined(__ARM_ARCH_5TE__) && \
+  !defined(__ARM_ARCH_5TEJ__) && \
+  !defined(__ARM_ARCH_6__) && \
+  !defined(__ARM_ARCH_6J__) && \
+  !defined(__ARM_ARCH_6K__) && \
+  !defined(__ARM_ARCH_6Z__) && \
+  !defined(__ARM_ARCH_6ZK__) && \
+  !defined(__ARM_ARCH_6T2__)
+
+// ARMv7 and newer support native unaligned accesses, but only of 16-bit
+// and 32-bit values (not 64-bit); older versions either raise a fatal signal,
+// do an unaligned read and rotate the words around a bit, or do the reads very
+// slowly (trip through kernel mode).
+
+#define BROTLI_UNALIGNED_LOAD32(_p) (*reinterpret_cast<const uint32_t *>(_p))
+#define BROTLI_UNALIGNED_STORE32(_p, _val) \
+  (*reinterpret_cast<uint32_t *>(_p) = (_val))
+
+inline uint64_t BROTLI_UNALIGNED_LOAD64(const void *p) {
+  uint64_t t;
+  memcpy(&t, p, sizeof t);
+  return t;
+}
+
+inline void BROTLI_UNALIGNED_STORE64(void *p, uint64_t v) {
+  memcpy(p, &v, sizeof v);
+}
+
+#else
+
+// These functions are provided for architectures that don't support
+// unaligned loads and stores.
+
+inline uint32_t BROTLI_UNALIGNED_LOAD32(const void *p) {
+  uint32_t t;
+  memcpy(&t, p, sizeof t);
+  return t;
+}
+
+inline uint64_t BROTLI_UNALIGNED_LOAD64(const void *p) {
+  uint64_t t;
+  memcpy(&t, p, sizeof t);
+  return t;
+}
+
+inline void BROTLI_UNALIGNED_STORE32(void *p, uint32_t v) {
+  memcpy(p, &v, sizeof v);
+}
+
+inline void BROTLI_UNALIGNED_STORE64(void *p, uint64_t v) {
+  memcpy(p, &v, sizeof v);
+}
+
+#endif
+
+#endif  // BROTLI_ENC_PORT_H_