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Implement serialization for big-endian platforms

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刘皓 2025-02-10 18:58:47 -05:00
parent 711f9a4553
commit d7cd4ff3ae
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GPG key ID: 7901753DB465B711
1 changed files with 46 additions and 4 deletions
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50
src/util/serial-util.h
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@ -23,14 +23,11 @@
#define SERIALUTIL_H #define SERIALUTIL_H
#include <stdint.h> #include <stdint.h>
#include <stdlib.h>
#include <string.h> #include <string.h>
#include <SDL_endian.h> #include <SDL_endian.h>
#if SDL_BYTEORDER != SDL_LIL_ENDIAN
#error "Non little endian systems not supported"
#endif
static inline int32_t static inline int32_t
readInt32(const char **dataP) readInt32(const char **dataP)
{ {
@ -39,23 +36,56 @@ readInt32(const char **dataP)
memcpy(&result, *dataP, 4); memcpy(&result, *dataP, 4);
*dataP += 4; *dataP += 4;
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
# ifdef _MSC_VER
static_assert(sizeof(unsigned long) == sizeof(int32_t), "unsigned long should be 32 bits");
result = (int32_t)_byteswap_ulong((unsigned long)result);
# else
result = (int32_t)__builtin_bswap32((uint32_t)result);
# endif
#endif
return result; return result;
} }
static inline double static inline double
readDouble(const char **dataP) readDouble(const char **dataP)
{ {
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
uint64_t result;
memcpy(&result, *dataP, 8);
*dataP += 8;
# ifdef _MSC_VER
result = (uint64_t)_byteswap_uint64((unsigned __int64)result);
# else
result = __builtin_bswap64(result);
# endif
return *(double *)&result;
#else
double result; double result;
memcpy(&result, *dataP, 8); memcpy(&result, *dataP, 8);
*dataP += 8; *dataP += 8;
return result; return result;
#endif
} }
static inline void static inline void
writeInt32(char **dataP, int32_t value) writeInt32(char **dataP, int32_t value)
{ {
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
# ifdef _MSC_VER
static_assert(sizeof(unsigned long) == sizeof(int32_t), "unsigned long should be 32 bits");
value = (int32_t)_byteswap_ulong((unsigned long)value);
# else
value = (int32_t)__builtin_bswap32((uint32_t)value);
# endif
#endif
memcpy(*dataP, &value, 4); memcpy(*dataP, &value, 4);
*dataP += 4; *dataP += 4;
} }
@ -63,7 +93,19 @@ writeInt32(char **dataP, int32_t value)
static inline void static inline void
writeDouble(char **dataP, double value) writeDouble(char **dataP, double value)
{ {
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
uint64_t valueUint = *(uint64_t *)&value;
# ifdef _MSC_VER
valueUint = (uint64_t)_byteswap_uint64((unsigned __int64)valueUint);
# else
valueUint = __builtin_bswap64(valueUint);
# endif
memcpy(*dataP, &valueUint, 8);
#else
memcpy(*dataP, &value, 8); memcpy(*dataP, &value, 8);
#endif
*dataP += 8; *dataP += 8;
} }