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(image-type-header-regexps): Change element format

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to include third item NOT-ALWAYS.
(image-type-from-data): Handle new format.
(image-type-from-buffer): Handle new format.  New arg INCLUDE-MAYBES.
(image-type-from-file-header): Pass t for INCLUDE-MAYBES.
This commit is contained in:
Richard M. Stallman 2006-12-26 18:01:40 +00:00
parent 14429ceb08
commit 6137433cad
1 changed files with 35 additions and 20 deletions
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55
lisp/image.el
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@ -34,20 +34,27 @@
(defconst image-type-header-regexps
'(("\\`/[\t\n\r ]*\\*.*XPM.\\*/" . xpm)
("\\`P[1-6][[:space:]]+\\(?:#.*[[:space:]]+\\)*[0-9]+[[:space:]]+[0-9]+" . pbm)
("\\`GIF8" . gif)
("\\`\x89PNG\r\n\x1a\n" . png)
("\\`[\t\n\r ]*#define" . xbm)
("\\`\\(?:MM\0\\*\\|II\\*\0\\)" . tiff)
("\\`[\t\n\r ]*%!PS" . postscript)
("\\`\xff\xd8" . (image-jpeg-p . jpeg)))
"Alist of (REGEXP . IMAGE-TYPE) pairs used to auto-detect image types.
'(("\\`/[\t\n\r ]*\\*.*XPM.\\*/" xpm)
("\\`P[1-6][[:space:]]+\\(?:#.*[[:space:]]+\\)*[0-9]+[[:space:]]+[0-9]+" pbm)
("\\`GIF8" gif)
("\\`\x89PNG\r\n\x1a\n" png)
("\\`[\t\n\r ]*#define" xbm)
("\\`\\(?:MM\0\\*\\|II\\*\0\\)" tiff)
("\\`[\t\n\r ]*%!PS" postscript t)
("\\`\xff\xd8" (image-jpeg-p . jpeg)))
"Alist of (REGEXP IMAGE-TYPE) pairs used to auto-detect image types.
When the first bytes of an image file match REGEXP, it is assumed to
be of image type IMAGE-TYPE if IMAGE-TYPE is a symbol. If not a symbol,
IMAGE-TYPE must be a pair (PREDICATE . TYPE). PREDICATE is called
with one argument, a string containing the image data. If PREDICATE returns
a non-nil value, TYPE is the image's type.")
be of image type IMAGE-TYPE if IMAGE-TYPE is a symbol.
An element can also be (REGEXP IMAGE-TYPE NOT-ALWAYS). If
NOT-ALWAYS is non-nil, that means that REGEXP identifies a
file that _can_ be treated as an image of type IMAGE-TYPE,
but such files should not be spontaneously treated as images.
IMAGE-TYPE can be a pair (PREDICATE . TYPE) instead of a
symbol. Then PREDICATE is called with one argument, a
string containing the image data. If PREDICATE returns a
non-nil value, TYPE is the image's type.")
(defconst image-type-file-name-regexps
'(("\\.png\\'" . png)
@ -205,7 +212,7 @@ be determined."
type)
(while types
(let ((regexp (car (car types)))
(image-type (cdr (car types))))
(image-type (nth 1 (car types))))
(if (or (and (symbolp image-type)
(string-match regexp data))
(and (consp image-type)
@ -218,17 +225,22 @@ be determined."
;;;###autoload
(defun image-type-from-buffer ()
(defun image-type-from-buffer (&optional include-maybes)
"Determine the image type from data in the current buffer.
Value is a symbol specifying the image type or nil if type cannot
be determined."
Value is a symbol specifying the image type, or nil if none
corresponds to the buffer contents.
If INCLUDE-MAYBES is nil (the default), we return nil for
file types that should not always be treated as images
even though they can be so treated."
(let ((types image-type-header-regexps)
type
(opoint (point)))
(goto-char (point-min))
(while types
(let ((regexp (car (car types)))
(image-type (cdr (car types)))
(image-type (nth 1 (car types)))
(not-always (nth 2 (car types)))
data)
(if (or (and (symbolp image-type)
(looking-at regexp))
@ -241,7 +253,10 @@ be determined."
(min (point-max)
(+ (point-min) 256))))))
(setq image-type (cdr image-type))))
(setq type image-type
;; If this entry says "not always",
;; treat it as nil, unless INCLUDE-MAYBES is t.
(setq type (if (or include-maybes (not not-always))
image-type)
types nil)
(setq types (cdr types)))))
(goto-char opoint)
@ -261,7 +276,7 @@ be determined."
(with-temp-buffer
(set-buffer-multibyte nil)
(insert-file-contents-literally file nil 0 256)
(image-type-from-buffer))))
(image-type-from-buffer t))))
;;;###autoload