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system/ByteOrder: add noexcept

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This commit is contained in:
Max Kellermann
2020-08-14 16:35:19 +02:00
parent 4f6c54ecb3
commit cbcdc73f9a
1 changed files with 20 additions and 20 deletions
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40
src/util/ByteOrder.hxx
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@@ -74,39 +74,39 @@
#endif #endif
constexpr bool constexpr bool
IsLittleEndian() IsLittleEndian() noexcept
{ {
return IS_LITTLE_ENDIAN; return IS_LITTLE_ENDIAN;
} }
constexpr bool constexpr bool
IsBigEndian() IsBigEndian() noexcept
{ {
return IS_BIG_ENDIAN; return IS_BIG_ENDIAN;
} }
constexpr uint16_t constexpr uint16_t
GenericByteSwap16(uint16_t value) GenericByteSwap16(uint16_t value) noexcept
{ {
return (value >> 8) | (value << 8); return (value >> 8) | (value << 8);
} }
constexpr uint32_t constexpr uint32_t
GenericByteSwap32(uint32_t value) GenericByteSwap32(uint32_t value) noexcept
{ {
return (value >> 24) | ((value >> 8) & 0x0000ff00) | return (value >> 24) | ((value >> 8) & 0x0000ff00) |
((value << 8) & 0x00ff0000) | (value << 24); ((value << 8) & 0x00ff0000) | (value << 24);
} }
constexpr uint64_t constexpr uint64_t
GenericByteSwap64(uint64_t value) GenericByteSwap64(uint64_t value) noexcept
{ {
return uint64_t(GenericByteSwap32(uint32_t(value >> 32))) return uint64_t(GenericByteSwap32(uint32_t(value >> 32)))
| (uint64_t(GenericByteSwap32(value)) << 32); | (uint64_t(GenericByteSwap32(value)) << 32);
} }
constexpr uint16_t constexpr uint16_t
ByteSwap16(uint16_t value) ByteSwap16(uint16_t value) noexcept
{ {
#if CLANG_OR_GCC_VERSION(4,8) #if CLANG_OR_GCC_VERSION(4,8)
return __builtin_bswap16(value); return __builtin_bswap16(value);
@@ -116,7 +116,7 @@ ByteSwap16(uint16_t value)
} }
constexpr uint32_t constexpr uint32_t
ByteSwap32(uint32_t value) ByteSwap32(uint32_t value) noexcept
{ {
#if CLANG_OR_GCC_VERSION(4,3) #if CLANG_OR_GCC_VERSION(4,3)
return __builtin_bswap32(value); return __builtin_bswap32(value);
@@ -126,7 +126,7 @@ ByteSwap32(uint32_t value)
} }
constexpr uint64_t constexpr uint64_t
ByteSwap64(uint64_t value) ByteSwap64(uint64_t value) noexcept
{ {
#if CLANG_OR_GCC_VERSION(4,3) #if CLANG_OR_GCC_VERSION(4,3)
return __builtin_bswap64(value); return __builtin_bswap64(value);
@@ -139,7 +139,7 @@ ByteSwap64(uint64_t value)
* Converts a 16bit value from big endian to the system's byte order * Converts a 16bit value from big endian to the system's byte order
*/ */
constexpr uint16_t constexpr uint16_t
FromBE16(uint16_t value) FromBE16(uint16_t value) noexcept
{ {
return IsBigEndian() ? value : ByteSwap16(value); return IsBigEndian() ? value : ByteSwap16(value);
} }
@@ -148,7 +148,7 @@ FromBE16(uint16_t value)
* Converts a 32bit value from big endian to the system's byte order * Converts a 32bit value from big endian to the system's byte order
*/ */
constexpr uint32_t constexpr uint32_t
FromBE32(uint32_t value) FromBE32(uint32_t value) noexcept
{ {
return IsBigEndian() ? value : ByteSwap32(value); return IsBigEndian() ? value : ByteSwap32(value);
} }
@@ -157,7 +157,7 @@ FromBE32(uint32_t value)
* Converts a 64bit value from big endian to the system's byte order * Converts a 64bit value from big endian to the system's byte order
*/ */
constexpr uint64_t constexpr uint64_t
FromBE64(uint64_t value) FromBE64(uint64_t value) noexcept
{ {
return IsBigEndian() ? value : ByteSwap64(value); return IsBigEndian() ? value : ByteSwap64(value);
} }
@@ -166,7 +166,7 @@ FromBE64(uint64_t value)
* Converts a 16bit value from little endian to the system's byte order * Converts a 16bit value from little endian to the system's byte order
*/ */
constexpr uint16_t constexpr uint16_t
FromLE16(uint16_t value) FromLE16(uint16_t value) noexcept
{ {
return IsLittleEndian() ? value : ByteSwap16(value); return IsLittleEndian() ? value : ByteSwap16(value);
} }
@@ -175,7 +175,7 @@ FromLE16(uint16_t value)
* Converts a 32bit value from little endian to the system's byte order * Converts a 32bit value from little endian to the system's byte order
*/ */
constexpr uint32_t constexpr uint32_t
FromLE32(uint32_t value) FromLE32(uint32_t value) noexcept
{ {
return IsLittleEndian() ? value : ByteSwap32(value); return IsLittleEndian() ? value : ByteSwap32(value);
} }
@@ -184,7 +184,7 @@ FromLE32(uint32_t value)
* Converts a 64bit value from little endian to the system's byte order * Converts a 64bit value from little endian to the system's byte order
*/ */
constexpr uint64_t constexpr uint64_t
FromLE64(uint64_t value) FromLE64(uint64_t value) noexcept
{ {
return IsLittleEndian() ? value : ByteSwap64(value); return IsLittleEndian() ? value : ByteSwap64(value);
} }
@@ -193,7 +193,7 @@ FromLE64(uint64_t value)
* Converts a 16bit value from the system's byte order to big endian * Converts a 16bit value from the system's byte order to big endian
*/ */
constexpr uint16_t constexpr uint16_t
ToBE16(uint16_t value) ToBE16(uint16_t value) noexcept
{ {
return IsBigEndian() ? value : ByteSwap16(value); return IsBigEndian() ? value : ByteSwap16(value);
} }
@@ -202,7 +202,7 @@ ToBE16(uint16_t value)
* Converts a 32bit value from the system's byte order to big endian * Converts a 32bit value from the system's byte order to big endian
*/ */
constexpr uint32_t constexpr uint32_t
ToBE32(uint32_t value) ToBE32(uint32_t value) noexcept
{ {
return IsBigEndian() ? value : ByteSwap32(value); return IsBigEndian() ? value : ByteSwap32(value);
} }
@@ -211,7 +211,7 @@ ToBE32(uint32_t value)
* Converts a 64bit value from the system's byte order to big endian * Converts a 64bit value from the system's byte order to big endian
*/ */
constexpr uint64_t constexpr uint64_t
ToBE64(uint64_t value) ToBE64(uint64_t value) noexcept
{ {
return IsBigEndian() ? value : ByteSwap64(value); return IsBigEndian() ? value : ByteSwap64(value);
} }
@@ -220,7 +220,7 @@ ToBE64(uint64_t value)
* Converts a 16bit value from the system's byte order to little endian * Converts a 16bit value from the system's byte order to little endian
*/ */
constexpr uint16_t constexpr uint16_t
ToLE16(uint16_t value) ToLE16(uint16_t value) noexcept
{ {
return IsLittleEndian() ? value : ByteSwap16(value); return IsLittleEndian() ? value : ByteSwap16(value);
} }
@@ -229,7 +229,7 @@ ToLE16(uint16_t value)
* Converts a 32bit value from the system's byte order to little endian * Converts a 32bit value from the system's byte order to little endian
*/ */
constexpr uint32_t constexpr uint32_t
ToLE32(uint32_t value) ToLE32(uint32_t value) noexcept
{ {
return IsLittleEndian() ? value : ByteSwap32(value); return IsLittleEndian() ? value : ByteSwap32(value);
} }
@@ -238,7 +238,7 @@ ToLE32(uint32_t value)
* Converts a 64bit value from the system's byte order to little endian * Converts a 64bit value from the system's byte order to little endian
*/ */
constexpr uint64_t constexpr uint64_t
ToLE64(uint64_t value) ToLE64(uint64_t value) noexcept
{ {
return IsLittleEndian() ? value : ByteSwap64(value); return IsLittleEndian() ? value : ByteSwap64(value);
} }