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cpython/Lib/imghdr.py at 3.5 · python/cpython · GitHub
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imghdr.py
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cpython
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imghdr.py
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"""Recognize image file formats based on their first few bytes."""
__all__
=
[
"what"
]
#-------------------------#
# Recognize image headers #
#-------------------------#
def
what
(
file
,
h
=
None
):
f
=
None
try
:
if
h
is
None
:
if
isinstance
(
file
,
str
):
f
=
open
(
file
,
'rb'
)
h
=
f
.
read
(
32
)
else
:
location
=
file
.
tell
()
h
=
file
.
read
(
32
)
file
.
seek
(
location
)
for
tf
in
tests
:
res
=
tf
(
h
,
f
)
if
res
:
return
res
finally
:
if
f
:
f
.
close
()
return
None
#---------------------------------#
# Subroutines per image file type #
#---------------------------------#
tests
=
[]
def
test_jpeg
(
h
,
f
):
"""JPEG data in JFIF or Exif format"""
if
h
[
6
:
10
]
in
(
b'JFIF'
,
b'Exif'
):
return
'jpeg'
tests
.
append
(
test_jpeg
)
def
test_png
(
h
,
f
):
if
h
.
startswith
(
b'
\211
PNG
\r
\n
\032
\n
'
):
return
'png'
tests
.
append
(
test_png
)
def
test_gif
(
h
,
f
):
"""GIF ('87 and '89 variants)"""
if
h
[:
6
]
in
(
b'GIF87a'
,
b'GIF89a'
):
return
'gif'
tests
.
append
(
test_gif
)
def
test_tiff
(
h
,
f
):
"""TIFF (can be in Motorola or Intel byte order)"""
if
h
[:
2
]
in
(
b'MM'
,
b'II'
):
return
'tiff'
tests
.
append
(
test_tiff
)
def
test_rgb
(
h
,
f
):
"""SGI image library"""
if
h
.
startswith
(
b'
\001
\332
'
):
return
'rgb'
tests
.
append
(
test_rgb
)
def
test_pbm
(
h
,
f
):
"""PBM (portable bitmap)"""
if
len
(
h
)
>=
3
and
\
h
[
0
]
==
ord
(
b'P'
)
and
h
[
1
]
in
b'14'
and
h
[
2
]
in
b'
\t
\n
\r
'
:
return
'pbm'
tests
.
append
(
test_pbm
)
def
test_pgm
(
h
,
f
):
"""PGM (portable graymap)"""
if
len
(
h
)
>=
3
and
\
h
[
0
]
==
ord
(
b'P'
)
and
h
[
1
]
in
b'25'
and
h
[
2
]
in
b'
\t
\n
\r
'
:
return
'pgm'
tests
.
append
(
test_pgm
)
def
test_ppm
(
h
,
f
):
"""PPM (portable pixmap)"""
if
len
(
h
)
>=
3
and
\
h
[
0
]
==
ord
(
b'P'
)
and
h
[
1
]
in
b'36'
and
h
[
2
]
in
b'
\t
\n
\r
'
:
return
'ppm'
tests
.
append
(
test_ppm
)
def
test_rast
(
h
,
f
):
"""Sun raster file"""
if
h
.
startswith
(
b'
\x59
\xA6
\x6A
\x95
'
):
return
'rast'
tests
.
append
(
test_rast
)
def
test_xbm
(
h
,
f
):
"""X bitmap (X10 or X11)"""
if
h
.
startswith
(
b'#define '
):
return
'xbm'
tests
.
append
(
test_xbm
)
def
test_bmp
(
h
,
f
):
if
h
.
startswith
(
b'BM'
):
return
'bmp'
tests
.
append
(
test_bmp
)
def
test_webp
(
h
,
f
):
if
h
.
startswith
(
b'RIFF'
)
and
h
[
8
:
12
]
==
b'WEBP'
:
return
'webp'
tests
.
append
(
test_webp
)
def
test_exr
(
h
,
f
):
if
h
.
startswith
(
b'
\x76
\x2f
\x31
\x01
'
):
return
'exr'
tests
.
append
(
test_exr
)
#--------------------#
# Small test program #
#--------------------#
def
test
():
import
sys
recursive
=
0
if
sys
.
argv
[
1
:]
and
sys
.
argv
[
1
]
==
'-r'
:
del
sys
.
argv
[
1
:
2
]
recursive
=
1
try
:
if
sys
.
argv
[
1
:]:
testall
(
sys
.
argv
[
1
:],
recursive
,
1
)
else
:
testall
([
'.'
],
recursive
,
1
)
except
KeyboardInterrupt
:
sys
.
stderr
.
write
(
'
\n
[Interrupted]
\n
'
)
sys
.
exit
(
1
)
def
testall
(
list
,
recursive
,
toplevel
):
import
sys
import
os
for
filename
in
list
:
if
os
.
path
.
isdir
(
filename
):
print
(
filename
+
'/:'
,
end
=
' '
)
if
recursive
or
toplevel
:
print
(
'recursing down:'
)
import
glob
names
=
glob
.
glob
(
os
.
path
.
join
(
filename
,
'*'
))
testall
(
names
,
recursive
,
0
)
else
:
print
(
'*** directory (use -r) ***'
)
else
:
print
(
filename
+
':'
,
end
=
' '
)
sys
.
stdout
.
flush
()
try
:
print
(
what
(
filename
))
except
OSError
:
print
(
'*** not found ***'
)
if
__name__
==
'__main__'
:
test
()
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