On 2/7/19 10:35 PM, Todd Chester via perl6-users wrote:
I am dealing with a Buf what includes 32 bit integers, but
they are entered somewhat backwards as view with hexedit:
AE 5D 5C 72 represents the number 725C5DAE
This is what I have come up with to convert this type of
number in a buffer to and integer
$ p6 'my Buf $x=Buf.new(0xAE,0x5D,0x5C,0x72); my int32 $i=$x +< 0x18
+ $x +< 0x10 + $x +< 0x08 + $x; say $x; say $i.base(0x10);'
Buf:0x<ae 5d 5c 72>
Is there a more "elegant" way to do this?
Thank you for all the wonderful tips! Now I have to
write them all down for my own documentation.
This is a fun one I also came up with. Since I was already
doing bitwise shift left, I thought I might as well do
it all with bitwise operations: first bitwise shift left,
then bitwise OR to combine them. (Yes, I played with AND
and OR gates 40 years ago. CMOS was my favorite.)
$ p6 'my Buf $x=Buf.new(0xAE,0x5D,0x5C,0x72);
my int32 $i=$x +< 0x18 +| $x +< 0x10 +| $x +< 0x08
Buf:0x<AE 5D 5C 72>
Interesting that I did not have to put () to force the order of
operation. "shift" came before "OR".