t_fourcc typedef and endianness
Hello,
This is probably more of a general C question rather than max/msp.
In Max SDK 6.1.4 there is a typedef t_fourcc which is a 32 bit uint. It is there for conveniently storing 4 characters as I understand.
I know that:
ASCII hex
'M' = 6d
'T' = 54
'h' = 68
'd' = 64
Now if I do this
t_fourcc midi = 'MThd';
is my value stored as 6d 54 68 64 starting from the smaller address name irrelevant of machine endianness? In contrast, for example, uint = 4
will be stored differently on a little endian machine and big endian machine (right?)
To correctly handle endianess with four char codes you can byteswap as follows. Note that in this case typestr is 5 chars long to accomodate the NULL termination.
void fourcc_from_int(char *typestr, t_fourcc type)
{
t_int32 type_swapped;
#if C74_LITTLE_ENDIAN
type_swapped = BYTEORDER_SWAPW32(type);
#else
type_swapped = type;
#endif
strncpy_zero(typestr, (char*)(&type_swapped), 5);
}