Re: [Pharo-project] detect if image was saved with Cog

[Sven Van Caekenberghe]

On 01 Oct 2012, at 13:30, Levente Uzonyi <le...@elte.hu> wrote:

> Currently there are 3 image formats around 6502 (old interpreter format, no 
> closures), 6504 (new interpreter format with closures), 6505 (Cog format). 
> The first two bytes of the image file contain the image format in 
> little-endian (IIRC) format. So you can decide it by checking the first byte 
> (head -c 1). If you only support the old interpreter format, then the 
> following bash expression should work:
> 
> [ $(head -c 1 $IMAGE_NAME) == 'f' ]

SmalltalkImage current 
        imagePath asFileReference 
                readStreamDo: [ :stream | 
                        stream binary.
                        (stream next: 2) reversed asInteger ].

to express your description in Smalltalk code then.

Thanks for the explanation.

--
Sven Van Caekenberghe
http://stfx.eu
Smalltalk is the Red Pill