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byte_utils.hpp
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byte_utils.hpp
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#if !defined BYTE_MANIP_HPP
#define BYTE_MANIP_HPP
#include <fstream>
namespace LocalStress {
static inline bool is_lsb_first(void) {
const int16_t s = 0x1234;
return (*(int8_t*)&s == 0x34);
}
static inline bool is_msb_first(void) {
const int16_t s = 0x1234;
return (*(int8_t*)&s == 0x12);
}
static inline uint32_t byte_swap(const int in) {
return byte_swap((uint32_t)in);
}
static inline uint32_t byte_swap(const uint32_t in) {
return
((in & 0x000000ff) << 24) |
((in & 0x0000ff00) << 8) |
((in & 0x00ff0000) >> 8) |
((in & 0xff000000) >> 24);
}
static inline uint64_t byte_swap(const uint64_t in) {
return
((in & 0x00000000000000ff) << 56) |
((in & 0x000000000000ff00) << 40) |
((in & 0x0000000000ff0000) << 24) |
((in & 0x00000000ff000000) << 8) |
((in & 0x000000ff00000000) >> 8) |
((in & 0x0000ff0000000000) >> 24) |
((in & 0x00ff000000000000) >> 40) |
((in & 0xff00000000000000) >> 56);
}
static inline uint32_t conv2uint(const uint32_t in) {
return in;
}
static inline uint32_t conv2uint(const int in) {
return in;
}
static inline uint32_t conv2uint(const float in) {
union {
float f;
uint32_t ui;
} tmp;
tmp.f = in;
return tmp.ui;
}
static inline uint64_t conv2uint(const double in) {
union {
double d;
uint64_t ui;
} tmp;
tmp.d = in;
return tmp.ui;
}
template <typename S>
auto conv2_lsb_first_if_needed(const S in) -> decltype(conv2uint(in)) {
if (is_lsb_first()) {
return conv2uint(in);
} else if (is_msb_first()) {
return byte_swap(conv2uint(in));
} else {
LOCAL_STRESS_ERR("Non-supported endian.");
return -1;
}
}
template <typename T>
static inline void write_as_lsbfirst(std::ofstream& fout,
const T in) {
const auto dat = conv2_lsb_first_if_needed(in);
fout.write(reinterpret_cast<const char*>(&dat), sizeof(T));
}
template <>
void write_as_lsbfirst<std::string>(std::ofstream& fout, const std::string in) {
fout.write(in.c_str(), in.length() * sizeof(char));
}
}
#endif