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* bug#58669: 28.2; bindat: str and strz not operating on vectors
@ 2022-10-20 12:18 Nacho Barrientos
  2022-10-20 20:57 ` Stefan Kangas
  2022-10-21 15:29 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
  0 siblings, 2 replies; 8+ messages in thread
From: Nacho Barrientos @ 2022-10-20 12:18 UTC (permalink / raw)
  To: 58669

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Hi,

These two snippets:

  (let* ((type (bindat-type
                 (data strz)))
         (data [#x4e #x6f #x6e #x65 #x00])
         (unpacked (bindat-unpack type data)))
    (bindat-get-field unpacked 'data))

  (let* ((type (bindat-type
                 (data str 4)))
         (data [#x4e #x6f #x6e #x65])
         (unpacked (bindat-unpack type data)))
    (bindat-get-field unpacked 'data))

Both fail similarly:

Debugger entered--Lisp error: (wrong-type-argument listp [78 111 110 101])
  apply(unibyte-string [78 111 110 101])
  (if (stringp s) s (apply #'unibyte-string s))
  (let ((i 0) s) (while (and (if len (< i len) t) (/= (aref bindat-raw (+ bindat-idx i)) 0)) (setq i (1+ i))) (setq s (substring bindat-raw bindat-idx (+ bindat-idx i))) (setq bindat-idx (+ bindat-idx (or len (1+ i)))) (if (stringp s) s (apply #'unibyte-string s)))
  bindat--unpack-strz(nil)
  [...]

Debugger entered--Lisp error: (wrong-type-argument listp [78 111 110 101])
  apply(unibyte-string [78 111 110 101])
  (if (stringp s) s (apply #'unibyte-string s))
  (let ((s (substring bindat-raw bindat-idx (+ bindat-idx len)))) (setq bindat-idx (+ bindat-idx len)) (if (stringp s) s (apply #'unibyte-string s)))
  bindat--unpack-str(4)
  [...]

With the attached patch both return the string "None" as expected (well,
as I'd expect, *grins*). The diff also adds some extra tests.

I'm running 28.2 but I've declared both functions as they're in the
current master and the patch is on top of the current master, too.

It's the first time that I look into this package so I'm not sure this
is the way it's meant to work but similar operations work fine on
vectors of bytes, for instance:

  (let* ((type (bindat-type
                 (first uint 16)
                 (second uint 16)))
         (data [#x00 #xff #xff #x00])
         (unpacked (bindat-unpack type data)))
    (list (bindat-get-field unpacked 'first)
          (bindat-get-field unpacked 'second)
          (bindat-length type unpacked)))

(which returns (255 65280 4) as expected)

Please simply ignore this if I'm talking rubbish :)

Hope this helps.


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From a8831aadf57f39862560b37d507be2a3bcb99aa2 Mon Sep 17 00:00:00 2001
From: Nacho Barrientos <nacho.barrientos@cern.ch>
Date: Thu, 20 Oct 2022 14:16:43 +0200
Subject: [PATCH] bindat (src, strz): operate on vectors too

---
 lisp/emacs-lisp/bindat.el            |  4 ++--
 test/lisp/emacs-lisp/bindat-tests.el | 19 ++++++++++++++++++-
 2 files changed, 20 insertions(+), 3 deletions(-)

diff --git a/lisp/emacs-lisp/bindat.el b/lisp/emacs-lisp/bindat.el
index 0ecac3d52a..83188b369e 100644
--- a/lisp/emacs-lisp/bindat.el
+++ b/lisp/emacs-lisp/bindat.el
@@ -163,7 +163,7 @@ bindat--unpack-str
   (let ((s (substring bindat-raw bindat-idx (+ bindat-idx len))))
     (setq bindat-idx (+ bindat-idx len))
     (if (stringp s) s
-      (apply #'unibyte-string s))))
+      (apply #'unibyte-string (append s nil)))))
 
 (defun bindat--unpack-strz (&optional len)
   (let ((i 0) s)
@@ -172,7 +172,7 @@ bindat--unpack-strz
     (setq s (substring bindat-raw bindat-idx (+ bindat-idx i)))
     (setq bindat-idx (+ bindat-idx (or len (1+ i))))
     (if (stringp s) s
-      (apply #'unibyte-string s))))
+      (apply #'unibyte-string (append s nil)))))
 
 (defun bindat--unpack-bits (len)
   (let ((bits nil) (bnum (1- (* 8 len))) j m)
diff --git a/test/lisp/emacs-lisp/bindat-tests.el b/test/lisp/emacs-lisp/bindat-tests.el
index 0c03c51e2e..2abf714852 100644
--- a/test/lisp/emacs-lisp/bindat-tests.el
+++ b/test/lisp/emacs-lisp/bindat-tests.el
@@ -252,7 +252,24 @@ bindat-test--str-strz-multibyte
     (should (equal (bindat-unpack spec "abc\0") "abc"))
     ;; Missing null terminator.
     (should-error (bindat-unpack spec ""))
-    (should-error (bindat-unpack spec "a"))))
+    (should-error (bindat-unpack spec "a")))
+
+  (ert-deftest bindat-test--strz-array-unpack ()
+    (should (equal (bindat-unpack spec [#x61 #x62 #x63 #x00]) "abc"))))
+
+(let ((spec (bindat-type str 3)))
+  (ert-deftest bindat-test--str-simple-array-unpack ()
+    (should (equal (bindat-unpack spec [#x61 #x62 #x63]) "abc"))))
+
+(let ((spec (bindat-type
+              (first u8)
+              (string str 3)
+              (last uint 16))))
+  (ert-deftest bindat-test--str-combined-array-unpack ()
+    (let ((unpacked (bindat-unpack spec [#xff #x63 #x62 #x61 #xff #xff])))
+      (should (equal (bindat-get-field unpacked 'string) "cba"))
+      (should (equal (bindat-get-field unpacked 'first) (- (expt 2 8) 1)))
+      (should (equal (bindat-get-field unpacked 'last) (- (expt 2 16) 1))))))
 
 (let ((spec '((x strz 2))))
   (ert-deftest bindat-test--strz-legacy-fixedlen-len ()
-- 
2.38.0


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In GNU Emacs 28.2 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.34, cairo version 1.17.6)
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--
 bye
 Nacho
 http://cern.ch/nacho

^ permalink raw reply related	[flat|nested] 8+ messages in thread
end of thread, other threads:[~2022-10-23  8:18 UTC | newest]

Thread overview: 8+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2022-10-20 12:18 bug#58669: 28.2; bindat: str and strz not operating on vectors Nacho Barrientos
2022-10-20 20:57 ` Stefan Kangas
2022-10-21 15:29 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-10-21 16:02   ` Eli Zaretskii
2022-10-21 16:47     ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-10-21 17:16       ` Eli Zaretskii
2022-10-21 18:34         ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2022-10-23  8:18   ` Nacho Barrientos

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