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Subject: |
[22.2]: visiting boost_1_35_0.tar.bz2 causes an error |
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Date: |
Fri, 16 May 2008 11:51:48 +0100 |
In GNU Emacs 22.2.1 (sparc-sun-solaris2.8, Motif Version 2.1.0)
of 2008-03-28 on risksun2
Windowing system distributor `Hummingbird Ltd.', version 11.0.100015
configured using `configure '--x-includes=/usr/openwin/include:/usr/dt/include:/usr/local/include:/usr/local/X11/include' '--x-libraries=/usr/openwin/lib:/usr/dt/lib:/usr/local/lib:/usr/local/X11/lib' '--with-x-toolkit=motif''
This report is going to be annoying, because http://downloads.sourceforge.net/boost/boost_1_35_0.tar.bz2?modtime=1206795398&big_mirror=0 is a 22M file. Sorry. This also applies to 22.1.
If I download the file, then visiting it under emacs -Q gives me:
Debugger entered--Lisp error: (args-out-of-range -256589311 -256588799)
buffer-substring(-256589311 -256588799)
(tar-header-block-tokenize (buffer-substring pos (+ pos 512)))
(setq tokens (tar-header-block-tokenize (buffer-substring pos ...)))
(eq (quote empty-tar-block) (setq tokens (tar-header-block-tokenize ...)))
(not (eq (quote empty-tar-block) (setq tokens ...)))
(and (<= (+ pos 512) (point-max)) (not (eq ... ...)))
(while (and (<= ... ...) (not ...)) (setq pos (+ pos 512)) (progress-reporter-update progress-reporter pos) (if (memq ... ...) (setq pos ...)) (let (...) (if ... ...) (push ... result) (and ... ... ...)))
(let* ((result ...) (pos ...) (progress-reporter ...) tokens) (while (and ... ...) (setq pos ...) (progress-reporter-update progress-reporter pos) (if ... ...) (let ... ... ... ...)) (make-local-variable (quote tar-parse-info)) (setq tar-parse-info (nreverse result)) (if (eq tokens ...) (progress-reporter-done progress-reporter) (message "Warning: premature EOF parsing tar file")))
(let ((modified ...)) (set-buffer-multibyte nil) (let* (... ... ... tokens) (while ... ... ... ... ...) (make-local-variable ...) (setq tar-parse-info ...) (if ... ... ...)) (set-buffer-multibyte default-enable-multibyte-characters) (goto-char (point-min)) (let (...) (let ... ...) (narrow-to-region ... ...) (set ... ...) (goto-char ...) (restore-buffer-modified-p modified)))
tar-summarize-buffer()
tar-mode()
set-auto-mode-0(tar-mode nil)
set-auto-mode()
normal-mode(t)
after-find-file(nil t)
find-file-noselect-1(#<buffer boost_1_35_0.tar.bz2> "~/ftp/boost_1_35_0.tar.bz2" nil nil "~/ftp/boost_1_35_0.tar.bz2" (1855815 71344173))
find-file-noselect("/homedev/marshals/ftp/boost_1_35_0.tar.bz2" nil nil nil)
find-file("/homedev/marshals/ftp/boost_1_35_0.tar.bz2")
dired-advertised-find-file()
call-interactively(dired-advertised-find-file)
The transition of pos to a negative value happens here in tar-summarize-buffer:
(and (null (tar-header-link-type tokens))
(> size 0)
(setq pos
(+ pos 512 (ash (ash (1- size) -9) 9)) ; this works
;(+ pos (+ size (- 512 (rem (1- size) 512)))) ; this doesn't
))
After many iterations of the enclosing loop, but before the above form, pos=49390081 and size=230891239.
After the above form, pos=-256589311.
The dubious value of size has come from this value of tokens in the enclosing loop:
["boost_1_35_0/doc/html/boost/xpressive/op/insert/result_This(Cont,It,Size,Value),typename disable_if" 17363925 16815366 6377612 230891239 (1040640 53316) 548 nil "" nil nil nil 0 0]
If it is any help, the value of tokens in the previous iteration of the loop is:
[././@LongLink 0 0 0 151 (0 0) 4530 28 t root 0 0]
If it is any help, there are no files of size 230891239 in the tar.
Solaris "tar -tf" does list many @LongLink files, whereas GNU "tar -tf" does not.
Solaris tar extracts a file named "boost_1_35_0/doc/html/boost/xpressive/op/insert/result_This(Cont,It,Value),typename disable_if_ mpl_", whereas GNU tar extracts it as "boost_1_35_0/doc/html/boost/xpressive/op/insert/result_This(Cont,It,Value),typename disable_if_ mpl__or__ is_integral_ UNCVREF(It)_,is_same_ UNCVREF(It),UNCVREF(Value)_ _ ___type__id1001524.html", ie, Solaris tar truncates the file name (not file contents). Emacs tar-mode apparently truncates the file name further.
So it is an "unusual" tar. There is no difference between the download site's gzip and bzip tars.
I'm guessing that it is a valid tar though. Emacs should be able to parse it or fail gracefully.
Simon.
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