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Use faster struct pack/unpack functions for the endian table that matches the host's

This commit is contained in:
Bob Ippolito 2006-05-25 19:56:56 +00:00
parent 04ab994dca
commit a99865b12e
1 changed files with 27 additions and 3 deletions
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30
Modules/_struct.c
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@ -572,13 +572,13 @@ static formatdef native_table[] = {
{'I', sizeof(int), INT_ALIGN, nu_uint, np_uint},
{'l', sizeof(long), LONG_ALIGN, nu_long, np_long},
{'L', sizeof(long), LONG_ALIGN, nu_ulong, np_ulong},
{'f', sizeof(float), FLOAT_ALIGN, nu_float, np_float},
{'d', sizeof(double), DOUBLE_ALIGN, nu_double, np_double},
{'P', sizeof(void *), VOID_P_ALIGN, nu_void_p, np_void_p},
#ifdef HAVE_LONG_LONG
{'q', sizeof(PY_LONG_LONG), LONG_LONG_ALIGN, nu_longlong, np_longlong},
{'Q', sizeof(PY_LONG_LONG), LONG_LONG_ALIGN, nu_ulonglong,np_ulonglong},
#endif
{'f', sizeof(float), FLOAT_ALIGN, nu_float, np_float},
{'d', sizeof(double), DOUBLE_ALIGN, nu_double, np_double},
{'P', sizeof(void *), VOID_P_ALIGN, nu_void_p, np_void_p},
{0}
};
@ -1477,6 +1477,30 @@ init_struct(void)
if (PyType_Ready(&PyStructType) < 0)
return;
/* Check endian and swap in faster functions */
{
int one = 1;
formatdef *native = native_table;
formatdef *other, *ptr;
if ((int)*(unsigned char*)&one)
other = lilendian_table;
else
other = bigendian_table;
while (native->format != '\0' && other->format != '\0') {
ptr = other;
while (ptr->format != '\0') {
if (ptr->format == native->format) {
ptr->pack = native->pack;
ptr->unpack = native->unpack;
if (ptr == other)
other++;
break;
}
ptr++;
}
native++;
}
}
/* Add some symbolic constants to the module */
if (StructError == NULL) {