Hex to 4-byte/32-bit quantity

ruby-talk
1

I'm parsing a binary file and it contains (reading the specs on the
format) uInt32Number, 4-byte/32-bit quantities.

On the specific positions I read the value 0x000a - how do I turn this
into a 32-bit quantity?

Cheers
Mattias

···

--
Posted via http://www.ruby-forum.com/.

2

Instead of converting the bytes to hex first I just unpacked them:

s.unpack("N")

···

10

--
Posted via http://www.ruby-forum.com/\.

3

Mattias Bud wrote:

I'm parsing a binary file and it contains (reading the specs on the
format) uInt32Number, 4-byte/32-bit quantities.

You might find this library of mine useful:

http://raa.ruby-lang.org/project/bit-struct

···

--
        vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407

4

0x00 0x0a is only 16 bits. Assuming you mean 0x00 0x00 0x00 0x0a:

irb(main):001:0> s = "\x00\x00\x00\x0a"
=> "\000\000\000\n"
irb(main):002:0> puts s.unpack("N")[0]
10
=> nil

···

On Sun, Feb 25, 2007 at 09:04:44PM +0900, Mattias Bud wrote:

I'm parsing a binary file and it contains (reading the specs on the
format) uInt32Number, 4-byte/32-bit quantities.

On the specific positions I read the value 0x000a - how do I turn this
into a 32-bit quantity?

5

0x00 0x0a is only 16 bits. Assuming you mean 0x00 0x00 0x00 0x0a:

Yes - this was what I ment.

Thanks

···

--
Posted via http://www.ruby-forum.com/\.

6

You might find this library of mine useful:

http://raa.ruby-lang.org/project/bit-struct

Found that link in a previous post here also. I just wanted to get the
hang of it by doing it my self.

But thanks
Mattias

···

--
Posted via http://www.ruby-forum.com/\.