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#ifndef FLOATCODE_H_INCLUDED
#define FLOATCODE_H_INCLUDED
#include "pm_config.h" /* BYTE_ORDER */
unsigned int const pm_byteOrder = BYTE_ORDER;
typedef struct {
/*----------------------------------------------------------------------------
This is a big-endian representation of a 32 bit floating point number.
I.e. bytes[0] contains the sign bit, etc.
On a big-endian machines, this is bit for bit identical to 'float'.
On a little-endian machine, it isn't.
This is an important data type because decent file formats use
big-endian -- they don't care if some CPU happens to use some other
code for its own work.
-----------------------------------------------------------------------------*/
unsigned char bytes[4];
} pm_bigendFloat;
static __inline__ float
pm_floatFromBigendFloat(pm_bigendFloat const arg) {
float retval;
switch (pm_byteOrder) {
case BIG_ENDIAN: {
union {
pm_bigendFloat bigend;
float native;
} converter;
converter.bigend = arg;
retval = converter.native;
}; break;
case LITTLE_ENDIAN: {
union {
unsigned char bytes[4];
float native;
} converter;
converter.bytes[0] = arg.bytes[3];
converter.bytes[1] = arg.bytes[2];
converter.bytes[2] = arg.bytes[1];
converter.bytes[3] = arg.bytes[0];
retval = converter.native;
} break;
}
return retval;
}
static __inline__ pm_bigendFloat
pm_bigendFloatFromFloat(float const arg) {
pm_bigendFloat retval;
switch (pm_byteOrder) {
case BIG_ENDIAN: {
union {
pm_bigendFloat bigend;
float native;
} converter;
converter.native = arg;
retval = converter.bigend;
} break;
case LITTLE_ENDIAN: {
union {
unsigned char bytes[4];
float native;
} converter;
converter.native = arg;
retval.bytes[0] = converter.bytes[3];
retval.bytes[1] = converter.bytes[2];
retval.bytes[2] = converter.bytes[1];
retval.bytes[3] = converter.bytes[0];
} break;
}
return retval;
}
typedef struct {
/*----------------------------------------------------------------------------
This is a big-endian representation of a 64 bit floating point number.
I.e. bytes[0] contains the sign bit, etc.
On a big-endian machines, this is bit for bit identical to 'float'.
On a little-endian machine, it isn't.
This is an important data type because decent file formats use
big-endian -- they don't care if some CPU happens to use some other
code for its own work.
-----------------------------------------------------------------------------*/
unsigned char bytes[8];
} pm_bigendDouble;
static __inline__ double
pm_doubleFromBigendDouble(pm_bigendDouble const arg) {
double retval;
switch (pm_byteOrder) {
case BIG_ENDIAN: {
union {
pm_bigendDouble bigend;
double native;
} converter;
converter.bigend = arg;
retval = converter.native;
}; break;
case LITTLE_ENDIAN: {
union {
unsigned char bytes[8];
double native;
} converter;
converter.bytes[0] = arg.bytes[7];
converter.bytes[1] = arg.bytes[6];
converter.bytes[2] = arg.bytes[5];
converter.bytes[3] = arg.bytes[4];
converter.bytes[4] = arg.bytes[3];
converter.bytes[5] = arg.bytes[2];
converter.bytes[6] = arg.bytes[1];
converter.bytes[7] = arg.bytes[0];
retval = converter.native;
} break;
}
return retval;
}
static __inline__ pm_bigendDouble
pm_bigendDoubleFromDouble(double const arg) {
pm_bigendDouble retval;
switch (pm_byteOrder) {
case BIG_ENDIAN: {
union {
pm_bigendDouble bigend;
double native;
} converter;
converter.native = arg;
retval = converter.bigend;
} break;
case LITTLE_ENDIAN: {
union {
unsigned char bytes[8];
double native;
} converter;
converter.native = arg;
retval.bytes[0] = converter.bytes[7];
retval.bytes[1] = converter.bytes[6];
retval.bytes[2] = converter.bytes[5];
retval.bytes[3] = converter.bytes[4];
retval.bytes[4] = converter.bytes[3];
retval.bytes[5] = converter.bytes[2];
retval.bytes[6] = converter.bytes[1];
retval.bytes[7] = converter.bytes[0];
} break;
}
return retval;
}
#endif
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