<span class="Apple-style-span" style="border-collapse: collapse; ">Hmmm , the short answer is that the code I suggested is taken from a module to convert a GSM octet stream into a septet stream and it gives a different answer when using your more compact code :-) :<div>
<br></div><div><div>UD: << 203,176,184,204,86,191,1 >></div><div>Mine: [75,97,98,101,108,106,111,0]<br></div><div>Yours: << 101,108,23,12,98,90,126,1>><br></div><div><br></div><div>I remember the GSM octet-septet conversion being quite awkward to get right because the bytes were the 'wrong way round' which is probably why I ended up with the code I did i.e. having to use flip(...).</div>
<div><br></div></div></span><br><div class="gmail_quote">2009/3/5 Hynek Vychodil <span dir="ltr"><<a href="mailto:vychodil.hynek@gmail.com">vychodil.hynek@gmail.com</a>></span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
Why not?<br><br>unpack(UD) -><br> << <<0:1,X/bits>> || <<X:7/bits>> <= UD >>.<br><br><div class="gmail_quote">2009/3/5 Tony Seebregts <span dir="ltr"><<a href="mailto:tony.seebregts@gmail.com" target="_blank">tony.seebregts@gmail.com</a>></span><br>
<blockquote class="gmail_quote" style="border-left:1px solid rgb(204, 204, 204);margin:0pt 0pt 0pt 0.8ex;padding-left:1ex"><div><div></div><div class="h5">This is an extract from the code I use:<div><br></div><div><blockquote class="gmail_quote" style="border-left:1px solid rgb(204, 204, 204);margin:0px 0px 0px 0.8ex;padding-left:1ex">
<div>unpack(UD) -></div><div> septets(list_to_binary([ flip(X) || X <- binary_to_list(UD) ])).</div><div><br></div><div>septets(T) -></div><div> [ flipx(X) || <<X:7>> <= T].</div><div><br></div>
<div>% Flips the bits in an octet/septet for easy unpacking</div><div><br></div><div>flip(Octet) -></div><div> <<B8:1,B7:1,B6:1,B5:1,B4:1,B3:1,B2:1,B1:1>> = <<Octet>>,</div><div> <<B1:1,B2:1,B3:1,B4:1,B5:1,B6:1,B7:1,B8:1>>.</div>
</blockquote><div> </div><div>There is probably a better way of doing it but I was in a rush at the time :-)</div><div><br></div><div><br></div><div><br></div><div><br></div></div>
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