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(tar-summarize-buffer): Check for end of buffer before extracting substring.

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This commit is contained in:
Karl Heuer 1994-10-26 01:40:21 +00:00
parent a9fde32e8d
commit 1b15043ec2
1 changed files with 33 additions and 33 deletions
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66
lisp/tar-mode.el
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@ -398,40 +398,40 @@ is visible (and the real data of the buffer is hidden)."
(pos 1)
(bs (max 1 (- (buffer-size) 1024))) ; always 2+ empty blocks at end.
(bs100 (max 1 (/ bs 100)))
(tokens nil))
(tokens nil))
(while (not (eq tokens 'empty-tar-block))
(let* ((hblock (buffer-substring pos (+ pos 512))))
(setq tokens (tar-header-block-tokenize hblock))
(setq pos (+ pos 512))
(message "parsing tar file...%s%%"
;(/ (* pos 100) bs) ; this gets round-off lossage
(/ pos bs100) ; this doesn't
)
(if (eq tokens 'empty-tar-block)
nil
(if (null tokens) (error "premature EOF parsing tar file"))
(if (eq (tar-header-link-type tokens) 20)
;; Foo. There's an extra empty block after these.
(setq pos (+ pos 512)))
(let ((size (tar-header-size tokens)))
(if (< size 0)
(error "%s has size %s - corrupted"
(tar-header-name tokens) size))
;
; This is just too slow. Don't really need it anyway....
;(tar-header-block-check-checksum
; hblock (tar-header-block-checksum hblock)
; (tar-header-name tokens))
(setq result (cons (make-tar-desc pos tokens) result))
(if (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
))
))))
(if (> (+ pos 512) (point-max))
(error "premature EOF parsing tar file"))
(setq tokens
(tar-header-block-tokenize (buffer-substring pos (+ pos 512))))
(setq pos (+ pos 512))
(message "parsing tar file...%d%%"
;(/ (* pos 100) bs) ; this gets round-off lossage
(/ pos bs100) ; this doesn't
)
(if (eq tokens 'empty-tar-block)
nil
(if (eq (tar-header-link-type tokens) 20)
;; Foo. There's an extra empty block after these.
(setq pos (+ pos 512)))
(let ((size (tar-header-size tokens)))
(if (< size 0)
(error "%s has size %s - corrupted"
(tar-header-name tokens) size))
;
; This is just too slow. Don't really need it anyway....
;(tar-header-block-check-checksum
; hblock (tar-header-block-checksum hblock)
; (tar-header-name tokens))
(setq result (cons (make-tar-desc pos tokens) result))
(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
)))))
(make-local-variable 'tar-parse-info)
(setq tar-parse-info (nreverse result)))
(save-excursion