m[algs] Move BEInt here
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Behdad Esfahbod
parent
e5b7bc424d
commit
47f01c0726
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@ -35,7 +35,9 @@
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#include "hb-number.hh"
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/* Flags */
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/*
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* Flags
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*/
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/* Enable bitwise ops on enums marked as flags_t */
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/* To my surprise, looks like the function resolver is happy to silently cast
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@ -71,6 +73,83 @@
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#define FLAG64_UNSAFE(x) ((unsigned)(x) < 64 ? (((uint64_t) 1ULL) << (unsigned)(x)) : 0)
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/*
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* Big-endian integers.
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*/
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/* Endian swap, used in Windows related backends */
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static inline constexpr uint16_t hb_uint16_swap (uint16_t v)
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{ return (v >> 8) | (v << 8); }
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static inline constexpr uint32_t hb_uint32_swap (uint32_t v)
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{ return (hb_uint16_swap (v) << 16) | hb_uint16_swap (v >> 16); }
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template <typename Type, int Bytes = sizeof (Type)> struct BEInt;
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template <typename Type>
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struct BEInt<Type, 1>
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{
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public:
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BEInt () = default;
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constexpr BEInt (Type V) : v {V} {}
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constexpr operator Type () const { return v; }
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private: uint8_t v;
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};
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template <typename Type>
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struct BEInt<Type, 2>
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{
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public:
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BEInt () = default;
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constexpr BEInt (Type V) : v {(V >> 8) & 0xFF,
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(V ) & 0xFF} {}
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constexpr operator Type () const
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{
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#if ((defined(__GNUC__) && __GNUC__ >= 5) || defined(__clang__)) && \
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defined(__BYTE_ORDER) && \
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(__BYTE_ORDER == __LITTLE_ENDIAN || __BYTE_ORDER == __BIG_ENDIAN)
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/* Spoon-feed the compiler a big-endian integer with alignment 1.
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* https://github.com/harfbuzz/harfbuzz/pull/1398 */
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struct __attribute__((packed)) packed_uint16_t { uint16_t v; };
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#if __BYTE_ORDER == __LITTLE_ENDIAN
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return __builtin_bswap16 (((packed_uint16_t *) this)->v);
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#else /* __BYTE_ORDER == __BIG_ENDIAN */
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return ((packed_uint16_t *) this)->v;
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#endif
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#endif
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return (v[0] << 8)
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+ (v[1] );
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}
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private: uint8_t v[2];
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};
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template <typename Type>
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struct BEInt<Type, 3>
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{
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public:
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BEInt () = default;
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constexpr BEInt (Type V) : v {(V >> 16) & 0xFF,
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(V >> 8) & 0xFF,
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(V ) & 0xFF} {}
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constexpr operator Type () const { return (v[0] << 16)
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+ (v[1] << 8)
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+ (v[2] ); }
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private: uint8_t v[3];
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};
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template <typename Type>
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struct BEInt<Type, 4>
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{
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public:
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BEInt () = default;
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constexpr BEInt (Type V) : v {(V >> 24) & 0xFF,
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(V >> 16) & 0xFF,
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(V >> 8) & 0xFF,
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(V ) & 0xFF} {}
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constexpr operator Type () const { return (v[0] << 24)
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+ (v[1] << 16)
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+ (v[2] << 8)
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+ (v[3] ); }
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private: uint8_t v[4];
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};
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/* Encodes three unsigned integers in one 64-bit number. If the inputs have more than 21 bits,
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* values will be truncated / overlap, and might not decode exactly. */
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#define HB_CODEPOINT_ENCODE3(x,y,z) (((uint64_t) (x) << 42) | ((uint64_t) (y) << 21) | (uint64_t) (z))
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76
src/hb.hh
76
src/hb.hh
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@ -457,82 +457,6 @@ static inline float
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_hb_roundf (float x) { return floorf (x + .5f); }
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#define roundf(x) _hb_roundf(x)
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/* Endian swap, used in Windows related backends */
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static inline constexpr uint16_t hb_uint16_swap (uint16_t v)
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{ return (v >> 8) | (v << 8); }
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static inline constexpr uint32_t hb_uint32_swap (uint32_t v)
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{ return (hb_uint16_swap (v) << 16) | hb_uint16_swap (v >> 16); }
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/*
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* Big-endian integers.
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*/
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template <typename Type, int Bytes = sizeof (Type)> struct BEInt;
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template <typename Type>
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struct BEInt<Type, 1>
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{
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public:
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BEInt () = default;
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constexpr BEInt (Type V) : v {V} {}
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constexpr operator Type () const { return v; }
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private: uint8_t v;
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};
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template <typename Type>
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struct BEInt<Type, 2>
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{
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public:
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BEInt () = default;
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constexpr BEInt (Type V) : v {(V >> 8) & 0xFF,
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(V ) & 0xFF} {}
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constexpr operator Type () const
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{
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#if ((defined(__GNUC__) && __GNUC__ >= 5) || defined(__clang__)) && \
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defined(__BYTE_ORDER) && \
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(__BYTE_ORDER == __LITTLE_ENDIAN || __BYTE_ORDER == __BIG_ENDIAN)
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/* Spoon-feed the compiler a big-endian integer with alignment 1.
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* https://github.com/harfbuzz/harfbuzz/pull/1398 */
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struct __attribute__((packed)) packed_uint16_t { uint16_t v; };
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#if __BYTE_ORDER == __LITTLE_ENDIAN
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return __builtin_bswap16 (((packed_uint16_t *) this)->v);
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#else /* __BYTE_ORDER == __BIG_ENDIAN */
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return ((packed_uint16_t *) this)->v;
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#endif
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#endif
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return (v[0] << 8)
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+ (v[1] );
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}
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private: uint8_t v[2];
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};
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template <typename Type>
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struct BEInt<Type, 3>
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{
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public:
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BEInt () = default;
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constexpr BEInt (Type V) : v {(V >> 16) & 0xFF,
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(V >> 8) & 0xFF,
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(V ) & 0xFF} {}
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constexpr operator Type () const { return (v[0] << 16)
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+ (v[1] << 8)
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+ (v[2] ); }
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private: uint8_t v[3];
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};
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template <typename Type>
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struct BEInt<Type, 4>
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{
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public:
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BEInt () = default;
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constexpr BEInt (Type V) : v {(V >> 24) & 0xFF,
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(V >> 16) & 0xFF,
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(V >> 8) & 0xFF,
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(V ) & 0xFF} {}
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constexpr operator Type () const { return (v[0] << 24)
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+ (v[1] << 16)
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+ (v[2] << 8)
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+ (v[3] ); }
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private: uint8_t v[4];
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};
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/*
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* For lack of a better place, put Zawgyi script hack here.
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