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authorChris Palmer <palmer@chromium.org>2017-03-16 11:39:48 -0700
committerChromium commit bot <commit-bot@chromium.org>2017-03-16 19:59:52 +0000
commit79e548eb98caefd3ea0f0e4806a7abca6654e7dc (patch)
treeb72d07ae05f7fa06da7ad8ef0b733d403457903f /third_party/base/sys_byteorder.h
parent5e67ce37b4df8127a28644d312f194ca8fc63585 (diff)
downloadpdfium-79e548eb98caefd3ea0f0e4806a7abca6654e7dc.tar.xz
Import PartitionAlloc from Chromium.
We'll add callers in a later CL. BUG=pdfium:678 Change-Id: I98c8b2832c4750df326218e24ee8c1bd33b89b50 Reviewed-on: https://pdfium-review.googlesource.com/3066 Commit-Queue: Tom Sepez <tsepez@chromium.org> Reviewed-by: Tom Sepez <tsepez@chromium.org>
Diffstat (limited to 'third_party/base/sys_byteorder.h')
-rw-r--r--third_party/base/sys_byteorder.h141
1 files changed, 141 insertions, 0 deletions
diff --git a/third_party/base/sys_byteorder.h b/third_party/base/sys_byteorder.h
new file mode 100644
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+++ b/third_party/base/sys_byteorder.h
@@ -0,0 +1,141 @@
+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// This header defines cross-platform ByteSwap() implementations for 16, 32 and
+// 64-bit values, and NetToHostXX() / HostToNextXX() functions equivalent to
+// the traditional ntohX() and htonX() functions.
+// Use the functions defined here rather than using the platform-specific
+// functions directly.
+
+#ifndef BASE_SYS_BYTEORDER_H_
+#define BASE_SYS_BYTEORDER_H_
+
+#include <stdint.h>
+
+#include "third_party/base/logging.h"
+#include "third_party/build/build_config.h"
+
+#if defined(COMPILER_MSVC)
+#include <stdlib.h>
+#endif
+
+namespace pdfium {
+namespace base {
+
+// Returns a value with all bytes in |x| swapped, i.e. reverses the endianness.
+inline uint16_t ByteSwap(uint16_t x) {
+#if defined(COMPILER_MSVC)
+ return _byteswap_ushort(x);
+#else
+ return __builtin_bswap16(x);
+#endif
+}
+
+inline uint32_t ByteSwap(uint32_t x) {
+#if defined(COMPILER_MSVC)
+ return _byteswap_ulong(x);
+#else
+ return __builtin_bswap32(x);
+#endif
+}
+
+inline uint64_t ByteSwap(uint64_t x) {
+#if defined(COMPILER_MSVC)
+ return _byteswap_uint64(x);
+#else
+ return __builtin_bswap64(x);
+#endif
+}
+
+inline uintptr_t ByteSwapUintPtrT(uintptr_t x) {
+ // We do it this way because some build configurations are ILP32 even when
+ // defined(ARCH_CPU_64_BITS). Unfortunately, we can't use sizeof in #ifs. But,
+ // because these conditionals are constexprs, the irrelevant branches will
+ // likely be optimized away, so this construction should not result in code
+ // bloat.
+ if (sizeof(uintptr_t) == 4) {
+ return ByteSwap(static_cast<uint32_t>(x));
+ } else if (sizeof(uintptr_t) == 8) {
+ return ByteSwap(static_cast<uint64_t>(x));
+ } else {
+ NOTREACHED();
+ }
+}
+
+// Converts the bytes in |x| from host order (endianness) to little endian, and
+// returns the result.
+inline uint16_t ByteSwapToLE16(uint16_t x) {
+#if defined(ARCH_CPU_LITTLE_ENDIAN)
+ return x;
+#else
+ return ByteSwap(x);
+#endif
+}
+inline uint32_t ByteSwapToLE32(uint32_t x) {
+#if defined(ARCH_CPU_LITTLE_ENDIAN)
+ return x;
+#else
+ return ByteSwap(x);
+#endif
+}
+inline uint64_t ByteSwapToLE64(uint64_t x) {
+#if defined(ARCH_CPU_LITTLE_ENDIAN)
+ return x;
+#else
+ return ByteSwap(x);
+#endif
+}
+
+// Converts the bytes in |x| from network to host order (endianness), and
+// returns the result.
+inline uint16_t NetToHost16(uint16_t x) {
+#if defined(ARCH_CPU_LITTLE_ENDIAN)
+ return ByteSwap(x);
+#else
+ return x;
+#endif
+}
+inline uint32_t NetToHost32(uint32_t x) {
+#if defined(ARCH_CPU_LITTLE_ENDIAN)
+ return ByteSwap(x);
+#else
+ return x;
+#endif
+}
+inline uint64_t NetToHost64(uint64_t x) {
+#if defined(ARCH_CPU_LITTLE_ENDIAN)
+ return ByteSwap(x);
+#else
+ return x;
+#endif
+}
+
+// Converts the bytes in |x| from host to network order (endianness), and
+// returns the result.
+inline uint16_t HostToNet16(uint16_t x) {
+#if defined(ARCH_CPU_LITTLE_ENDIAN)
+ return ByteSwap(x);
+#else
+ return x;
+#endif
+}
+inline uint32_t HostToNet32(uint32_t x) {
+#if defined(ARCH_CPU_LITTLE_ENDIAN)
+ return ByteSwap(x);
+#else
+ return x;
+#endif
+}
+inline uint64_t HostToNet64(uint64_t x) {
+#if defined(ARCH_CPU_LITTLE_ENDIAN)
+ return ByteSwap(x);
+#else
+ return x;
+#endif
+}
+
+} // namespace base
+} // namespace pdfium
+
+#endif // BASE_SYS_BYTEORDER_H_