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#!/usr/bin/python3
import sys
import struct
f = open(sys.argv[1], 'rb')
dpx = f.read(768)
magic = dpx[0:4]
if magic == b'XPDS':
print('Little-endian')
endian = '<'
elif magic == b'SDPX':
print('Big-endian')
endian = '>'
else:
print('Unrecognised magic word', file=sys.stderr)
sys.exit(1)
image = f.read(640)
im = dict()
(im['orientation'],
im['number_elements'],
im['pixels_per_line'],
im['lines_per_element'],
im['data_sign'],
im['low_data'],
im['low_quantity'],
im['high_data'],
im['high_quantity'],
im['descriptor'],
im['transfer'],
im['colorimetric']) = struct.unpack('%shhiiiififBBB' % endian, image[0:35])
transfer = { 0: 'user-defined', 1: 'printing density', 2: 'linear', 3: 'logarithmic', 4: 'unspecified video', 5: 'SMPTE 240M', 6: 'CCIR 709-1', 7: 'CCIR601-2 system B or G',
8: 'CCIR 601-2 system M', 9: 'NTSC composite video', 10: 'PAL composite video', 11: 'Z linear', 12: 'Z homogeneous' }
for k, v in im.items():
if k == 'transfer':
v = transfer[v]
print('%s: %s' % (k, v))
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