* hexl-mode: searching for multi byte sequence?
@ 2015-07-13 17:55 Alfred M. Szmidt
2015-07-14 7:07 ` Stephen J. Turnbull
0 siblings, 1 reply; 3+ messages in thread
From: Alfred M. Szmidt @ 2015-07-13 17:55 UTC (permalink / raw)
To: emacs-devel
Is there some way in hexl-mode to search for a (hex, octal, ...) byte
sequence? Currently, C-s behaves a bit strange in at least two regards:
1) If file contains the byte sequence #xDEADBEAF, depending on how
they are aligned (odd or even word), one has to look for "DEAD
BEAF" and "DE ADBE AF".
00000000: dead beaf 0000 0000 0000 0000 0000 0000 ................
00000000: 00de adbe af00 0000 0000 0000 0000 0000 ................
2) If the byte sequence continues on a new line, i.e.
00000000: 0000 0000 0000 0000 0000 0000 0000 dead ................
00000010: beaf 0000 0000 0000 0000 0000 0000 0000 ................
Then it is impossible to find the string at all.
Cheers, Alfred.
^ permalink raw reply [flat|nested] 3+ messages in thread
* hexl-mode: searching for multi byte sequence?
2015-07-13 17:55 hexl-mode: searching for multi byte sequence? Alfred M. Szmidt
@ 2015-07-14 7:07 ` Stephen J. Turnbull
2015-07-14 14:51 ` Eli Zaretskii
0 siblings, 1 reply; 3+ messages in thread
From: Stephen J. Turnbull @ 2015-07-14 7:07 UTC (permalink / raw)
To: Alfred M. Szmidt; +Cc: emacs-devel
Alfred M. Szmidt writes:
> Is there some way in hexl-mode to search for a (hex, octal, ...) byte
> sequence? Currently, C-s behaves a bit strange in at least two regards:
>
> 1) If file contains the byte sequence #xDEADBEAF, depending on how
> they are aligned (odd or even word), one has to look for "DEAD
> BEAF" and "DE ADBE AF".
C-u C-s de\(.\n\)*ad\(.\|\n\)*be\(.\|\n\)*af
is what I'd use. It has obvious defects, and it would be nice if
hexl-mode provided something a little less greedy (eg a transformation
to a 3-armed disjunction allowing at most one newline plus handling
the leading byte number after the newline).
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: hexl-mode: searching for multi byte sequence?
2015-07-14 7:07 ` Stephen J. Turnbull
@ 2015-07-14 14:51 ` Eli Zaretskii
0 siblings, 0 replies; 3+ messages in thread
From: Eli Zaretskii @ 2015-07-14 14:51 UTC (permalink / raw)
To: Stephen J. Turnbull; +Cc: ams, emacs-devel
> From: "Stephen J. Turnbull" <stephen@xemacs.org>
> Date: Tue, 14 Jul 2015 16:07:47 +0900
> Cc: emacs-devel@gnu.org
>
> Alfred M. Szmidt writes:
> > Is there some way in hexl-mode to search for a (hex, octal, ...) byte
> > sequence? Currently, C-s behaves a bit strange in at least two regards:
> >
> > 1) If file contains the byte sequence #xDEADBEAF, depending on how
> > they are aligned (odd or even word), one has to look for "DEAD
> > BEAF" and "DE ADBE AF".
>
> C-u C-s de\(.\n\)*ad\(.\|\n\)*be\(.\|\n\)*af
>
> is what I'd use. It has obvious defects, and it would be nice if
> hexl-mode provided something a little less greedy (eg a transformation
> to a 3-armed disjunction allowing at most one newline plus handling
> the leading byte number after the newline).
Hexl already provides something similar, see
hexl-isearch-search-function. It allows to search in the text column
strings that span multiple lines, for example. It should be enhanced
to support Alfred's use case (and somebody please document it!).
^ permalink raw reply [flat|nested] 3+ messages in thread
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2015-07-13 17:55 hexl-mode: searching for multi byte sequence? Alfred M. Szmidt
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