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authorRichard <q@1bpm.net>2022-09-04 00:32:56 +0100
committerRichard <q@1bpm.net>2022-09-04 00:32:56 +0100
commit1d055261b4144dbf86b2658437015b15d4dd9bff (patch)
tree6049b19d1bf953a650383de1a5e438b8b82679f6 /include/jsoncons/config/binary_config.hpp
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diff --git a/include/jsoncons/config/binary_config.hpp b/include/jsoncons/config/binary_config.hpp
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+// Copyright 2017 Daniel Parker
+// Distributed under the Boost license, Version 1.0.
+// (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+// See https://github.com/danielaparker/jsoncons for latest version
+
+#ifndef JSONCONS_CONFIG_BINARY_CONFIG_HPP
+#define JSONCONS_CONFIG_BINARY_CONFIG_HPP
+
+#include <cfloat>
+#include <cstddef>
+#include <cstdint>
+#include <cstring> // std::memcpy
+#include <memory>
+#include <type_traits> // std::enable_if
+
+// The definitions below follow the definitions in compiler_support_p.h, https://github.com/01org/tinycbor
+// MIT license
+
+#ifdef __F16C__
+# include <immintrin.h>
+#endif
+
+#ifndef __has_builtin
+# define __has_builtin(x) 0
+#endif
+
+#if defined(__GNUC__)
+#if (__GNUC__ * 100 + __GNUC_MINOR__ >= 403) || (__has_builtin(__builtin_bswap64) && __has_builtin(__builtin_bswap32))
+# define JSONCONS_BYTE_SWAP_64 __builtin_bswap64
+# define JSONCONS_BYTE_SWAP_32 __builtin_bswap32
+# ifdef __INTEL_COMPILER
+# define JSONCONS_BYTE_SWAP_16 _bswap16
+# elif (__GNUC__ * 100 + __GNUC_MINOR__ >= 608) || __has_builtin(__builtin_bswap16)
+# define JSONCONS_BYTE_SWAP_16 __builtin_bswap16
+# endif
+#endif
+#elif defined(__sun)
+# include <sys/byteorder.h>
+#elif defined(_MSC_VER)
+// MSVC, which implies sizeof(long) == 4
+# define JSONCONS_BYTE_SWAP_64 _byteswap_uint64
+# define JSONCONS_BYTE_SWAP_32 _byteswap_ulong
+# define JSONCONS_BYTE_SWAP_16 _byteswap_ushort
+#endif
+
+namespace jsoncons {
+namespace binary {
+
+ struct uint128_holder
+ {
+ uint64_t lo;
+ uint64_t hi;
+ };
+
+ static inline bool add_check_overflow(std::size_t v1, std::size_t v2, std::size_t *r)
+ {
+ #if ((defined(__GNUC__) && (__GNUC__ >= 5)) && !defined(__INTEL_COMPILER)) || __has_builtin(__builtin_add_overflow)
+ return __builtin_add_overflow(v1, v2, r);
+ #else
+ // unsigned additions are well-defined
+ *r = v1 + v2;
+ return v1 > v1 + v2;
+ #endif
+ }
+
+ #if defined(__apple_build_version__) && ((__clang_major__ < 8) || ((__clang_major__ == 8) && (__clang_minor__ < 1)))
+ #define APPLE_MISSING_INTRINSICS 1
+ #endif
+
+ inline
+ uint16_t encode_half(double val)
+ {
+ #if defined(__F16C__) && !defined(APPLE_MISSING_INTRINSICS)
+ return _cvtss_sh((float)val, 3);
+ #else
+ uint64_t v;
+ std::memcpy(&v, &val, sizeof(v));
+ int64_t sign = static_cast<int64_t>(v >> 63 << 15);
+ int64_t exp = (v >> 52) & 0x7ff;
+ int64_t mant = v << 12 >> 12 >> (53-11); /* keep only the 11 most significant bits of the mantissa */
+ exp -= 1023;
+ if (exp == 1024) {
+ /* infinity or NaN */
+ exp = 16;
+ mant >>= 1;
+ } else if (exp >= 16) {
+ /* overflow, as largest number */
+ exp = 15;
+ mant = 1023;
+ } else if (exp >= -14) {
+ /* regular normal */
+ } else if (exp >= -24) {
+ /* subnormal */
+ mant |= 1024;
+ mant >>= -(exp + 14);
+ exp = -15;
+ } else {
+ /* underflow, make zero */
+ return 0;
+ }
+
+ /* safe cast here as bit operations above guarantee not to overflow */
+ return static_cast<uint16_t>(sign | ((exp + 15) << 10) | mant);
+ #endif
+ }
+
+ /* this function was copied & adapted from RFC 7049 Appendix D */
+ inline
+ double decode_half(uint16_t half)
+ {
+ #if defined(__F16C__) && !defined(APPLE_MISSING_INTRINSICS)
+ return _cvtsh_ss(half);
+ #else
+ int64_t exp = (half >> 10) & 0x1f;
+ int64_t mant = half & 0x3ff;
+ double val;
+ if (exp == 0)
+ {
+ val = ldexp(static_cast<double>(mant), -24);
+ }
+ else if (exp != 31)
+ {
+ val = ldexp(static_cast<double>(mant) + 1024.0, static_cast<int>(exp - 25));
+ }
+ else
+ {
+ val = mant == 0 ? std::numeric_limits<double>::infinity() : std::nan("");
+ }
+ return half & 0x8000 ? -val : val;
+ #endif
+ }
+
+ // byte_swap
+
+ template<class T>
+ typename std::enable_if<std::is_integral<T>::value && sizeof(T) == sizeof(uint8_t),T>::type
+ byte_swap(T val)
+ {
+ return val;
+ }
+
+ template<class T>
+ typename std::enable_if<std::is_integral<T>::value && sizeof(T) == sizeof(uint16_t),T>::type
+ byte_swap(T val)
+ {
+ #if defined(JSONCONS_BYTE_SWAP_16)
+ return JSONCONS_BYTE_SWAP_16(val);
+ #else
+ return (static_cast<uint16_t>(val) >> 8) | (static_cast<uint16_t>(val) << 8);
+ #endif
+ }
+
+ template<class T>
+ typename std::enable_if<std::is_integral<T>::value && sizeof(T) == sizeof(uint32_t),T>::type
+ byte_swap(T val)
+ {
+ #if defined(JSONCONS_BYTE_SWAP_32)
+ return JSONCONS_BYTE_SWAP_32(val);
+ #else
+ uint32_t tmp = ((static_cast<uint32_t>(val) << 8) & 0xff00ff00) | ((static_cast<uint32_t>(val) >> 8) & 0xff00ff);
+ return (tmp << 16) | (tmp >> 16);
+ #endif
+ }
+
+ template<class T>
+ typename std::enable_if<std::is_integral<T>::value && sizeof(T) == sizeof(uint64_t),T>::type
+ byte_swap(T val)
+ {
+ #if defined(JSONCONS_BYTE_SWAP_64)
+ return JSONCONS_BYTE_SWAP_64(val);
+ #else
+ uint64_t tmp = ((static_cast<uint64_t>(val) & 0x00000000ffffffffull) << 32) | ((static_cast<uint64_t>(val) & 0xffffffff00000000ull) >> 32);
+ tmp = ((tmp & 0x0000ffff0000ffffull) << 16) | ((tmp & 0xffff0000ffff0000ull) >> 16);
+ return ((tmp & 0x00ff00ff00ff00ffull) << 8) | ((tmp & 0xff00ff00ff00ff00ull) >> 8);
+ #endif
+ }
+
+ template<class T>
+ typename std::enable_if<std::is_floating_point<T>::value && sizeof(T) == sizeof(uint32_t),T>::type
+ byte_swap(T val)
+ {
+ uint32_t x;
+ std::memcpy(&x,&val,sizeof(uint32_t));
+ uint32_t y = byte_swap(x);
+ T val2;
+ std::memcpy(&val2,&y,sizeof(uint32_t));
+ return val2;
+ }
+
+ template<class T>
+ typename std::enable_if<std::is_floating_point<T>::value && sizeof(T) == sizeof(uint64_t),T>::type
+ byte_swap(T val)
+ {
+ uint64_t x;
+ std::memcpy(&x,&val,sizeof(uint64_t));
+ uint64_t y = byte_swap(x);
+ T val2;
+ std::memcpy(&val2,&y,sizeof(uint64_t));
+ return val2;
+ }
+
+ template<class T>
+ typename std::enable_if<std::is_floating_point<T>::value && sizeof(T) == 2*sizeof(uint64_t),T>::type
+ byte_swap(T val)
+ {
+ uint128_holder x;
+ uint8_t buf[2*sizeof(uint64_t)];
+ std::memcpy(buf,&val,2*sizeof(uint64_t));
+ std::memcpy(&x.lo,buf,sizeof(uint64_t));
+ std::memcpy(&x.hi,buf+sizeof(uint64_t),sizeof(uint64_t));
+
+ uint128_holder y;
+ y.lo = byte_swap(x.hi);
+ y.hi = byte_swap(x.lo);
+
+ T val2;
+ std::memcpy(&val2,&y,2*sizeof(uint64_t));
+
+ return val2;
+ }
+
+} // binary
+} // jsoncons
+
+#endif