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Clean up serialization helpers and add endianness check 

We don't handle big endian at the moment, so let's
error out on that.
This commit is contained in:
Jonas Kulla 2013-10-14 12:57:30 +02:00
parent 2a83cfc1e1
commit 36b904ede3
1 changed files with 32 additions and 44 deletions
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76
src/serial-util.h
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@ -23,13 +23,22 @@
#define SERIALUTIL_H #define SERIALUTIL_H
#include <stdint.h> #include <stdint.h>
#include <string.h>
#include <SDL_endian.h>
typedef unsigned uint; typedef unsigned uint;
#if SDL_BYTEORDER != SDL_LIL_ENDIAN
#error "Non little endian systems not supported"
#endif
static inline int16_t static inline int16_t
read_int16(const char *data, uint &i) read_int16(const char *data, uint &i)
{ {
int16_t result = (data[i] & 0x000000FF) | ((data[i+1] << 8) & 0x0000FF00); int16_t result;
memcpy(&result, &data[i], 2);
i += 2; i += 2;
return result; return result;
@ -38,68 +47,47 @@ read_int16(const char *data, uint &i)
static inline int32_t static inline int32_t
read_int32(const char *data, uint &i) read_int32(const char *data, uint &i)
{ {
int32_t result = ((data[i+0] << 0x00) & 0x000000FF) int32_t result;
| ((data[i+1] << 0x08) & 0x0000FF00)
| ((data[i+2] << 0x10) & 0x00FF0000) memcpy(&result, &data[i], 4);
| ((data[i+3] << 0x18) & 0xFF000000);
i += 4; i += 4;
return result; return result;
} }
static inline double
read_double(const char *data, uint &i)
{
double result;
memcpy(&result, &data[i], 8);
i += 8;
return result;
}
static inline void static inline void
write_int16(char **data, int16_t value) write_int16(char **data, int16_t value)
{ {
*(*data)++ = (value >> 0) & 0xFF; memcpy(*data, &value, 2);
*(*data)++ = (value >> 8) & 0xFF;
data += 2;
} }
static inline void static inline void
write_int32(char **data, int32_t value) write_int32(char **data, int32_t value)
{ {
*(*data)++ = (value >> 0x00) & 0xFF; memcpy(*data, &value, 4);
*(*data)++ = (value >> 0x08) & 0xFF;
*(*data)++ = (value >> 0x10) & 0xFF;
*(*data)++ = (value >> 0x18) & 0xFF;
}
union doubleInt data += 4;
{ }
double d;
int64_t i;
};
static inline void static inline void
write_double(char **data, double value) write_double(char **data, double value)
{ {
doubleInt di; memcpy(*data, &value, 8);
di.d = value;
*(*data)++ = (di.i >> 0x00) & 0xFF; data += 8;
*(*data)++ = (di.i >> 0x08) & 0xFF;
*(*data)++ = (di.i >> 0x10) & 0xFF;
*(*data)++ = (di.i >> 0x18) & 0xFF;
*(*data)++ = (di.i >> 0x20) & 0xFF;
*(*data)++ = (di.i >> 0x28) & 0xFF;
*(*data)++ = (di.i >> 0x30) & 0xFF;
*(*data)++ = (di.i >> 0x38) & 0xFF;
}
static inline double
read_double(const char *data, uint &i)
{
doubleInt di;
di.i = (((int64_t)data[i+0] << 0x00) & 0x00000000000000FF)
| (((int64_t)data[i+1] << 0x08) & 0x000000000000FF00)
| (((int64_t)data[i+2] << 0x10) & 0x0000000000FF0000)
| (((int64_t)data[i+3] << 0x18) & 0x00000000FF000000)
| (((int64_t)data[i+4] << 0x20) & 0x000000FF00000000)
| (((int64_t)data[i+5] << 0x28) & 0x0000FF0000000000)
| (((int64_t)data[i+6] << 0x30) & 0x00FF000000000000)
| (((int64_t)data[i+7] << 0x38) & 0xFF00000000000000);
i += 8;
return di.d;
} }
#endif // SERIALUTIL_H #endif // SERIALUTIL_H