Reading unsigned byte

Ruby
1

I’m experiencing unexpected behavior when reading an byte… as apposed
to PHP which is returning expected results.

this is how I’m reading the byte in ruby: int =
somedata.unpack(‘c’).first

the result I’m getting in ruby is -127. In php I get 128. This is how I
read it in php:

int = ord(@this->raw_data($this->current_byte++]);

not sure how to go about debugging this…
thanks

2

On Mar 7, 9:44 am, warhero [email protected] wrote:

not sure how to go about debugging this…

‘c’ extracts a signed integer. ‘C’ extracts an unsigned integer.

irb(main):002:0> “\x80”.unpack(‘c’).first
=> -128
irb(main):003:0> “\x80”.unpack(‘C’).first
=> 128

3

Dale M. wrote:

On Mar 7, 9:44 am, warhero [email protected] wrote:

not sure how to go about debugging this…

‘c’ extracts a signed integer. ‘C’ extracts an unsigned integer.

irb(main):002:0> “\x80”.unpack(‘c’).first
=> -128
irb(main):003:0> “\x80”.unpack(‘C’).first
=> 128

Ha, Duh, as soon as you posted this I caught that in the docs. Thanks.