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Diffstat (limited to 'webrtc/base/byteorder.h')
-rw-r--r-- | webrtc/base/byteorder.h | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/webrtc/base/byteorder.h b/webrtc/base/byteorder.h new file mode 100644 index 0000000000..d579e6e185 --- /dev/null +++ b/webrtc/base/byteorder.h @@ -0,0 +1,166 @@ +/* + * Copyright 2004 The WebRTC Project Authors. All rights reserved. + * + * Use of this source code is governed by a BSD-style license + * that can be found in the LICENSE file in the root of the source + * tree. An additional intellectual property rights grant can be found + * in the file PATENTS. All contributing project authors may + * be found in the AUTHORS file in the root of the source tree. + */ + +#ifndef WEBRTC_BASE_BYTEORDER_H_ +#define WEBRTC_BASE_BYTEORDER_H_ + +#if defined(WEBRTC_POSIX) && !defined(__native_client__) +#include <arpa/inet.h> +#endif + +#if defined(WEBRTC_WIN) +#include <stdlib.h> +#endif + +#include "webrtc/base/basictypes.h" + +namespace rtc { + +// Reading and writing of little and big-endian numbers from memory +// TODO: Optimized versions, with direct read/writes of +// integers in host-endian format, when the platform supports it. + +inline void Set8(void* memory, size_t offset, uint8_t v) { + static_cast<uint8_t*>(memory)[offset] = v; +} + +inline uint8_t Get8(const void* memory, size_t offset) { + return static_cast<const uint8_t*>(memory)[offset]; +} + +inline void SetBE16(void* memory, uint16_t v) { + Set8(memory, 0, static_cast<uint8_t>(v >> 8)); + Set8(memory, 1, static_cast<uint8_t>(v >> 0)); +} + +inline void SetBE32(void* memory, uint32_t v) { + Set8(memory, 0, static_cast<uint8_t>(v >> 24)); + Set8(memory, 1, static_cast<uint8_t>(v >> 16)); + Set8(memory, 2, static_cast<uint8_t>(v >> 8)); + Set8(memory, 3, static_cast<uint8_t>(v >> 0)); +} + +inline void SetBE64(void* memory, uint64_t v) { + Set8(memory, 0, static_cast<uint8_t>(v >> 56)); + Set8(memory, 1, static_cast<uint8_t>(v >> 48)); + Set8(memory, 2, static_cast<uint8_t>(v >> 40)); + Set8(memory, 3, static_cast<uint8_t>(v >> 32)); + Set8(memory, 4, static_cast<uint8_t>(v >> 24)); + Set8(memory, 5, static_cast<uint8_t>(v >> 16)); + Set8(memory, 6, static_cast<uint8_t>(v >> 8)); + Set8(memory, 7, static_cast<uint8_t>(v >> 0)); +} + +inline uint16_t GetBE16(const void* memory) { + return static_cast<uint16_t>((Get8(memory, 0) << 8) | (Get8(memory, 1) << 0)); +} + +inline uint32_t GetBE32(const void* memory) { + return (static_cast<uint32_t>(Get8(memory, 0)) << 24) | + (static_cast<uint32_t>(Get8(memory, 1)) << 16) | + (static_cast<uint32_t>(Get8(memory, 2)) << 8) | + (static_cast<uint32_t>(Get8(memory, 3)) << 0); +} + +inline uint64_t GetBE64(const void* memory) { + return (static_cast<uint64_t>(Get8(memory, 0)) << 56) | + (static_cast<uint64_t>(Get8(memory, 1)) << 48) | + (static_cast<uint64_t>(Get8(memory, 2)) << 40) | + (static_cast<uint64_t>(Get8(memory, 3)) << 32) | + (static_cast<uint64_t>(Get8(memory, 4)) << 24) | + (static_cast<uint64_t>(Get8(memory, 5)) << 16) | + (static_cast<uint64_t>(Get8(memory, 6)) << 8) | + (static_cast<uint64_t>(Get8(memory, 7)) << 0); +} + +inline void SetLE16(void* memory, uint16_t v) { + Set8(memory, 0, static_cast<uint8_t>(v >> 0)); + Set8(memory, 1, static_cast<uint8_t>(v >> 8)); +} + +inline void SetLE32(void* memory, uint32_t v) { + Set8(memory, 0, static_cast<uint8_t>(v >> 0)); + Set8(memory, 1, static_cast<uint8_t>(v >> 8)); + Set8(memory, 2, static_cast<uint8_t>(v >> 16)); + Set8(memory, 3, static_cast<uint8_t>(v >> 24)); +} + +inline void SetLE64(void* memory, uint64_t v) { + Set8(memory, 0, static_cast<uint8_t>(v >> 0)); + Set8(memory, 1, static_cast<uint8_t>(v >> 8)); + Set8(memory, 2, static_cast<uint8_t>(v >> 16)); + Set8(memory, 3, static_cast<uint8_t>(v >> 24)); + Set8(memory, 4, static_cast<uint8_t>(v >> 32)); + Set8(memory, 5, static_cast<uint8_t>(v >> 40)); + Set8(memory, 6, static_cast<uint8_t>(v >> 48)); + Set8(memory, 7, static_cast<uint8_t>(v >> 56)); +} + +inline uint16_t GetLE16(const void* memory) { + return static_cast<uint16_t>((Get8(memory, 0) << 0) | (Get8(memory, 1) << 8)); +} + +inline uint32_t GetLE32(const void* memory) { + return (static_cast<uint32_t>(Get8(memory, 0)) << 0) | + (static_cast<uint32_t>(Get8(memory, 1)) << 8) | + (static_cast<uint32_t>(Get8(memory, 2)) << 16) | + (static_cast<uint32_t>(Get8(memory, 3)) << 24); +} + +inline uint64_t GetLE64(const void* memory) { + return (static_cast<uint64_t>(Get8(memory, 0)) << 0) | + (static_cast<uint64_t>(Get8(memory, 1)) << 8) | + (static_cast<uint64_t>(Get8(memory, 2)) << 16) | + (static_cast<uint64_t>(Get8(memory, 3)) << 24) | + (static_cast<uint64_t>(Get8(memory, 4)) << 32) | + (static_cast<uint64_t>(Get8(memory, 5)) << 40) | + (static_cast<uint64_t>(Get8(memory, 6)) << 48) | + (static_cast<uint64_t>(Get8(memory, 7)) << 56); +} + +// Check if the current host is big endian. +inline bool IsHostBigEndian() { + static const int number = 1; + return 0 == *reinterpret_cast<const char*>(&number); +} + +inline uint16_t HostToNetwork16(uint16_t n) { + uint16_t result; + SetBE16(&result, n); + return result; +} + +inline uint32_t HostToNetwork32(uint32_t n) { + uint32_t result; + SetBE32(&result, n); + return result; +} + +inline uint64_t HostToNetwork64(uint64_t n) { + uint64_t result; + SetBE64(&result, n); + return result; +} + +inline uint16_t NetworkToHost16(uint16_t n) { + return GetBE16(&n); +} + +inline uint32_t NetworkToHost32(uint32_t n) { + return GetBE32(&n); +} + +inline uint64_t NetworkToHost64(uint64_t n) { + return GetBE64(&n); +} + +} // namespace rtc + +#endif // WEBRTC_BASE_BYTEORDER_H_ |