50 lines
1.4 KiB
C++
50 lines
1.4 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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// Copyright 2017 Google LLC.
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//
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// This software is licensed under the terms defined in the Widevine Master
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// License Agreement. For a copy of this agreement, please contact
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// widevine-licensing@google.com.
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////////////////////////////////////////////////////////////////////////////////
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#ifndef UTIL_ENDIAN_ENDIAN_H_
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#define UTIL_ENDIAN_ENDIAN_H_
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#include <netinet/in.h>
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#include <cstdint>
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namespace widevine {
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// Utilities to convert numbers between the current hosts's native byte
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// order and big-endian byte order (same as network byte order)
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class BigEndian {
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public:
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static uint32_t Load32(const char* data) {
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return (data[0] << 24) | (data[1] << 16) | (data[2] << 8) | data[3];
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}
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static uint64_t Load64(const char* data) {
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return ((static_cast<uint64_t>(Load32(data)) << 32) | Load32(data + 4));
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}
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static void Store32(void* p, uint32_t data) {
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for (int i = 0; i < 4; ++i)
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(reinterpret_cast<uint8_t*>(p))[i] = (data >> ((3 - i) * 8)) & 0xFF;
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}
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}; // BigEndian
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inline uint64_t gntohll(uint64_t n) {
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uint64_t retval;
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#if __BYTE_ORDER == __BIG_ENDIAN
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retval = n;
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#else
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retval = ((uint64_t) ntohl(n & 0xFFFFFFFFLLU)) << 32;
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retval |= ntohl((n & 0xFFFFFFFF00000000LLU) >> 32);
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#endif
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return(retval);
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}
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} // namespace widevine
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#endif // UTIL_ENDIAN_ENDIAN_H_
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