* [9fans] Pjpeg in /sys/lib/mimetype
@ 2014-11-14 12:13 arisawa
2014-11-16 0:20 ` arisawa
0 siblings, 1 reply; 4+ messages in thread
From: arisawa @ 2014-11-14 12:13 UTC (permalink / raw)
To: Bell Labs of the OS Plan 9 from Fans
Hello,
It is curious for me that ".jpg" has two entries in /sys/lib/mimetype.
term% grep jpeg /sys/lib/mimetype
.jfif image jpeg - y
.jfif-tbnl image jpeg - y
.jpe image jpeg - y
.jpeg image jpeg - y
.jpg image jpeg - y
.jpg image pjpeg - y
term%
The file is currently consulted by only two applications: mail and httpd.
I thought that the file provides conventional way to determine mime type from file suffix.
If so, what is the mime type for "foo.jpg"?
Kenji arisawa
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [9fans] Pjpeg in /sys/lib/mimetype
2014-11-14 12:13 [9fans] Pjpeg in /sys/lib/mimetype arisawa
@ 2014-11-16 0:20 ` arisawa
2014-11-17 13:40 ` Steffen Nurpmeso
0 siblings, 1 reply; 4+ messages in thread
From: arisawa @ 2014-11-16 0:20 UTC (permalink / raw)
To: Fans of the OS Plan 9 from Bell Labs
Hello,
I believe the line:
.jpg image pjpeg - y
should be removed.
I found another curiosity in the file.
term% grep compress /sys/lib/mimetype
.Z - - compress m
.taz application x-tar compress m
.trz application x-tar compress m
.z - - compress m
.Z - - compress m
term%
Does this mean that file suffixes are case sensitive in determining the mime type?
If so, should files with suffix “.JPG” be renamed to “.jpg” ?
Kenji Arisawa
2014/11/14 21:13、arisawa <arisawa@ar.aichi-u.ac.JP> のメール:
> Hello,
>
> It is curious for me that ".jpg" has two entries in /sys/lib/mimetype.
> term% grep jpeg /sys/lib/mimetype
> .jfif image jpeg - y
> .jfif-tbnl image jpeg - y
> .jpe image jpeg - y
> .jpeg image jpeg - y
> .jpg image jpeg - y
> .jpg image pjpeg - y
> term%
>
> The file is currently consulted by only two applications: mail and httpd.
> I thought that the file provides conventional way to determine mime type from file suffix.
> If so, what is the mime type for "foo.jpg"?
>
> Kenji arisawa
>
>
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [9fans] Pjpeg in /sys/lib/mimetype
2014-11-16 0:20 ` arisawa
@ 2014-11-17 13:40 ` Steffen Nurpmeso
2014-11-17 14:20 ` lucio
0 siblings, 1 reply; 4+ messages in thread
From: Steffen Nurpmeso @ 2014-11-17 13:40 UTC (permalink / raw)
To: Fans of the OS Plan 9 from Bell Labs
Hello,
arisawa <arisawa@ar.aichi-u.ac.jp> wrote:
|Does this mean that file suffixes are case sensitive in determining \
|the mime type?
|If so, should files with suffix “.JPG” be renamed to “.jpg” ?
The RFC doesn't say a word on case, which i implicitly read as
case-insensitive (because how could it work otherwise).
(And note that i have forgotten which RFC this actually is, but
i can assure you i've read it before i wrote the code comment that
i've repeated in my first sentence.)
Note also that the pretty comprehensive TIKA database only uses
lowercase definitions [1].
[1] http://svn.apache.org/viewvc/tika/trunk/tika-core/src/main/resources/\
org/apache/tika/mime/tika-mimetypes.xml
--steffen
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [9fans] Pjpeg in /sys/lib/mimetype
2014-11-17 13:40 ` Steffen Nurpmeso
@ 2014-11-17 14:20 ` lucio
0 siblings, 0 replies; 4+ messages in thread
From: lucio @ 2014-11-17 14:20 UTC (permalink / raw)
To: 9fans
> The RFC doesn't say a word on case, which i implicitly read as
> case-insensitive (because how could it work otherwise).
The .z and .Z extensions were used originally to distinguish "packed"
and "compressed" files, respectively. MIME came later and seemingly
could not distinguish between these two cases. The problem is long
gone, no doubt.
Lucio.
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^ permalink raw reply [flat|nested] 4+ messages in thread
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2014-11-14 12:13 [9fans] Pjpeg in /sys/lib/mimetype arisawa
2014-11-16 0:20 ` arisawa
2014-11-17 13:40 ` Steffen Nurpmeso
2014-11-17 14:20 ` lucio
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