bug#58669: 28.2; bindat: str and strz not operating on vectors

[Nacho Barrientos]

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.

0001-bindat-src-strz-operate-on-vectors-too.patch
Description: Text Data

In GNU Emacs 28.2 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.34, cairo 
version 1.17.6)
 of 2022-09-12 built on frederik
Windowing system distributor 'The X.Org Foundation', version 11.0.12101004
System Description: Arch Linux

Configured using:
 'configure --with-x-toolkit=gtk3 --with-native-compilation
 --sysconfdir=/etc --prefix=/usr --libexecdir=/usr/lib
 --localstatedir=/var --with-cairo --with-harfbuzz --with-libsystemd
 --with-modules 'CFLAGS=-march=x86-64 -mtune=generic -O2 -pipe -fno-plt
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 -fstack-clash-protection -fcf-protection -g
 -ffile-prefix-map=/build/emacs/src=/usr/src/debug -flto=auto'
 'LDFLAGS=-Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now -flto=auto''

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Load-path shadows:
/home/nacho/.emacs.d/elpa/transient-20220918.2101/transient hides 
/usr/share/emacs/28.2/lisp/transient

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Memory information:
((conses 16 2785060 340167)
 (symbols 48 120088 102)
 (strings 32 626461 40628)
 (string-bytes 1 22822154)
 (vectors 16 228385)
 (vector-slots 8 5214189 734689)
 (floats 8 6603 3963)
 (intervals 56 145534 13846)
 (buffers 992 195))

--
 bye
 Nacho
 http://cern.ch/nacho