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b721761a1a
Functions htonll and ntohll are only available when
NTDDI_VERSION>=NTDDI_WIN8 or INCL_EXTRA_HTON_FUNCTIONS is defined,
instead of assuming this to be true, this CL replaces them with
_byteswap_uint64 [1].
On top of that, the following functions were assuming host to be
little endian on Windows and NaCl:
- htobe16(v)
- htobe32(v)
- be16toh(v)
- be32toh(v)
- htobe64(v)
- be64toh(v)
But it is the application's responsibility to check the host
endianness before calling ntohs, ntohl (and probably also htons and
htonl). See [2], especially: "The ntohs function returns the value
in host byte order. If the netshort parameter is already in host byte
order, then this function will reverse it. It is up to the application
to determine if the byte order must be reversed.".
After this CL, WebRTC should do the right thing based on the value
of WEBRTC_ARCH_{BIG,LITTLE}_ENDIAN.
[1] - https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/byteswap-uint64-byteswap-ulong-byteswap-ushort
[2] - https://docs.microsoft.com/en-us/windows/desktop/api/winsock/nf-winsock-ntohs
Bug: None
Change-Id: I61ca882ad81dd090fd164b0fdfeec64cd088a71d
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/129901
Reviewed-by: Tommi <tommi@webrtc.org>
Reviewed-by: Noah Richards <noahric@chromium.org>
Reviewed-by: Yves Gerey <yvesg@google.com>
Reviewed-by: Yves Gerey <yvesg@webrtc.org>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#27371}
192 lines
4.9 KiB
C++
192 lines
4.9 KiB
C++
/*
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* Copyright 2004 The WebRTC Project Authors. All rights reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef RTC_BASE_BYTE_ORDER_H_
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#define RTC_BASE_BYTE_ORDER_H_
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#include <stdint.h>
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#if defined(WEBRTC_POSIX) && !defined(__native_client__)
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#include <arpa/inet.h>
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#endif
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#include "rtc_base/system/arch.h"
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#if defined(WEBRTC_MAC)
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#include <libkern/OSByteOrder.h>
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#define htobe16(v) OSSwapHostToBigInt16(v)
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#define htobe32(v) OSSwapHostToBigInt32(v)
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#define htobe64(v) OSSwapHostToBigInt64(v)
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#define be16toh(v) OSSwapBigToHostInt16(v)
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#define be32toh(v) OSSwapBigToHostInt32(v)
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#define be64toh(v) OSSwapBigToHostInt64(v)
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#define htole16(v) OSSwapHostToLittleInt16(v)
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#define htole32(v) OSSwapHostToLittleInt32(v)
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#define htole64(v) OSSwapHostToLittleInt64(v)
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#define le16toh(v) OSSwapLittleToHostInt16(v)
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#define le32toh(v) OSSwapLittleToHostInt32(v)
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#define le64toh(v) OSSwapLittleToHostInt64(v)
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#elif defined(WEBRTC_WIN) || defined(__native_client__)
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#if defined(WEBRTC_WIN)
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#include <stdlib.h>
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#include <winsock2.h>
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#else
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#include <netinet/in.h>
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#endif // defined(WEBRTC_WIN)
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#if defined(WEBRTC_ARCH_LITTLE_ENDIAN)
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#define htobe16(v) htons(v)
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#define htobe32(v) htonl(v)
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#define be16toh(v) ntohs(v)
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#define be32toh(v) ntohl(v)
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#define htole16(v) (v)
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#define htole32(v) (v)
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#define htole64(v) (v)
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#define le16toh(v) (v)
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#define le32toh(v) (v)
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#define le64toh(v) (v)
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#if defined(WEBRTC_WIN)
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#define htobe64(v) _byteswap_uint64(v)
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#define be64toh(v) _byteswap_uint64(v)
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#endif // defined(WEBRTC_WIN)
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#if defined(__native_client__)
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#define htobe64(v) __builtin_bswap64(v)
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#define be64toh(v) __builtin_bswap64(v)
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#endif // defined(__native_client__)
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#elif defined(WEBRTC_ARCH_BIG_ENDIAN)
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#define htobe16(v) (v)
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#define htobe32(v) (v)
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#define be16toh(v) (v)
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#define be32toh(v) (v)
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#define htole16(v) __builtin_bswap16(v)
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#define htole32(v) __builtin_bswap32(v)
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#define htole64(v) __builtin_bswap64(v)
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#define le16toh(v) __builtin_bswap16(v)
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#define le32toh(v) __builtin_bswap32(v)
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#define le64toh(v) __builtin_bswap64(v)
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#if defined(WEBRTC_WIN)
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#define htobe64(v) (v)
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#define be64toh(v) (v)
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#endif // defined(WEBRTC_WIN)
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#if defined(__native_client__)
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#define htobe64(v) (v)
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#define be64toh(v) (v)
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#endif // defined(__native_client__)
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#else
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#error WEBRTC_ARCH_BIG_ENDIAN or WEBRTC_ARCH_LITTLE_ENDIAN must be defined.
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#endif // defined(WEBRTC_ARCH_LITTLE_ENDIAN)
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#elif defined(WEBRTC_POSIX)
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#include <endian.h>
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#else
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#error "Missing byte order functions for this arch."
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#endif // defined(WEBRTC_MAC)
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namespace rtc {
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// Reading and writing of little and big-endian numbers from memory
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inline void Set8(void* memory, size_t offset, uint8_t v) {
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static_cast<uint8_t*>(memory)[offset] = v;
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}
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inline uint8_t Get8(const void* memory, size_t offset) {
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return static_cast<const uint8_t*>(memory)[offset];
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}
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inline void SetBE16(void* memory, uint16_t v) {
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*static_cast<uint16_t*>(memory) = htobe16(v);
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}
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inline void SetBE32(void* memory, uint32_t v) {
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*static_cast<uint32_t*>(memory) = htobe32(v);
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}
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inline void SetBE64(void* memory, uint64_t v) {
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*static_cast<uint64_t*>(memory) = htobe64(v);
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}
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inline uint16_t GetBE16(const void* memory) {
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return be16toh(*static_cast<const uint16_t*>(memory));
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}
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inline uint32_t GetBE32(const void* memory) {
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return be32toh(*static_cast<const uint32_t*>(memory));
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}
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inline uint64_t GetBE64(const void* memory) {
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return be64toh(*static_cast<const uint64_t*>(memory));
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}
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inline void SetLE16(void* memory, uint16_t v) {
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*static_cast<uint16_t*>(memory) = htole16(v);
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}
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inline void SetLE32(void* memory, uint32_t v) {
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*static_cast<uint32_t*>(memory) = htole32(v);
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}
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inline void SetLE64(void* memory, uint64_t v) {
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*static_cast<uint64_t*>(memory) = htole64(v);
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}
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inline uint16_t GetLE16(const void* memory) {
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return le16toh(*static_cast<const uint16_t*>(memory));
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}
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inline uint32_t GetLE32(const void* memory) {
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return le32toh(*static_cast<const uint32_t*>(memory));
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}
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inline uint64_t GetLE64(const void* memory) {
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return le64toh(*static_cast<const uint64_t*>(memory));
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}
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// Check if the current host is big endian.
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inline bool IsHostBigEndian() {
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#if defined(WEBRTC_ARCH_BIG_ENDIAN)
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return true;
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#else
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return false;
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#endif
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}
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inline uint16_t HostToNetwork16(uint16_t n) {
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return htobe16(n);
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}
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inline uint32_t HostToNetwork32(uint32_t n) {
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return htobe32(n);
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}
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inline uint64_t HostToNetwork64(uint64_t n) {
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return htobe64(n);
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}
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inline uint16_t NetworkToHost16(uint16_t n) {
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return be16toh(n);
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}
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inline uint32_t NetworkToHost32(uint32_t n) {
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return be32toh(n);
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}
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inline uint64_t NetworkToHost64(uint64_t n) {
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return be64toh(n);
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}
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} // namespace rtc
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#endif // RTC_BASE_BYTE_ORDER_H_
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