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#! /usr/bin/env python
import os
import sys
import exif
def compose(delta, old):
map=[0, 4, 2, 6, 5, 1, 7, 3]
unmap=[1, 6, 3, 8, 2, 5, 4, 7]
x = map[delta-1]
y = map[old-1]
z = ((x^y)&4) + ((y+(x&3)*(((y&4)>>1)+1))&3)
return unmap[z]
def deg2o(d):
map={90:6, 270:8, 180:3}
if map.has_key(d):
return map[d]
else:
return 0
if len(sys.argv) < 2:
print 'Usage: %s [[+]orientnum] file\n' % sys.argv[0]
sys.exit(1)
try:
if len(sys.argv) == 2:
filename=sys.argv[1]
file=open(filename, "r");
else:
filename=sys.argv[2]
mod=sys.argv[1]
fd = os.open(filename, os.O_RDWR)
file=os.fdopen(fd,'r')
# check file exists and is readable
file.read(1)
file.seek(0,0)
except:
print 'Cannot open', filename
sys.exit(1)
tags=exif.process_file(file,0,1)
if not tags:
print 'no EXIF information in', filename
sys.exit(1)
if not tags.has_key('Exif Offset') \
or not tags.has_key('Image Orientation'):
print 'cannot get orientation info in', filename
sys.exit(1)
exifp = tags['Exif Offset']
endian = tags['Exif Endian']
tagp = tags['Image Orientation'].field_offset
orientp = exifp + tagp
if endian == 'M': # MM byte order
orientp += 1
file.seek(orientp)
o = ord(file.read(1))
if o < 1 or o > 8:
print 'orientation out of range', o
sys.exit(1)
if len(sys.argv) == 2:
print 'orientation is', o
sys.exit(0)
try:
if mod[0] == '+':
deltao = int(mod)
if 1 <= deltao and deltao <= 8:
newo = compose(deltao, o)
elif deg2o(deltao) != 0:
newo = compose(deg2o(deltao), o)
else:
print 'cannot understand orientation modification', mod
sys.exit(1) # it will still hit the except ... how to fix?
else:
newo = int(mod)
except:
print 'expected numeric orientation and got',mod
sys.exit(1)
if newo < 1 or newo > 8:
newo = deg2o(newo)
if newo == 0:
print 'cannot understand orientation', deltao
sys.exit(1)
os.lseek(fd,orientp,0)
os.write(fd,chr(newo))
# Thumbnail orientation :
thumb_ifdp = 0
if tags.has_key('Thumbnail Orientation'):
thumb_tagp = tags['Thumbnail Orientation'].field_offset
thumb_orientp = exifp + thumb_tagp
if endian == 'M': # MM byte order
thumb_orientp += 1
os.lseek(fd,thumb_orientp,0)
os.write(fd,chr(newo))
print 'orientation changed from', o, 'to', newo
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