pngsuite.py

# pngsuite.py

# PngSuite Test PNGs.

"""After you import this module with "import pngsuite" use
``pngsuite.bai0g01`` to get the bytes for a particular PNG image, or
use ``pngsuite.png`` to get a dict() of them all.
"""

import binascii
import sys

def _dehex(hexbytes):
    """Liberally convert from hex string to binary string."""

    # Remove all non-hexadecimal digits
    #s = re.sub(br'[^a-fA-F\d]', b'', s)
    # The non-hexadecimal characters are mainly newlines, so just remove those
    hexbytes = hexbytes.replace(b'\n', b'')
    # binscii.unhexlify works in Python 2 and Python 3 (unlike
    # thing.decode('hex')).
    return binascii.unhexlify(hexbytes)

# Copies of PngSuite test files taken
# from http://www.schaik.com/pngsuite/pngsuite_bas_png.html
# on 2009-02-19 by drj and converted to hex.
# Some of these are not actually in PngSuite (but maybe they should
# be?), they use the same naming scheme, but start with a capital
# letter.
png = {
    'basi0g01': _dehex(b"""
89504e470d0a1a0a0000000d49484452000000200000002001000000012c0677
cf0000000467414d41000186a031e8965f0000009049444154789c2d8d310ec2
300c45dfc682c415187a00a42e197ab81e83b127e00c5639001363a580d8582c
65c910357c4b78b0bfbfdf4f70168c19e7acb970a3f2d1ded9695ce5bf5963df
d92aaf4c9fd927ea449e6487df5b9c36e799b91bdf082b4d4bd4014fe4014b01
ab7a17aee694d28d328a2d63837a70451e1648702d9a9ff4a11d2f7a51aa21e5
a18c7ffd0094e3511d661822f20000000049454e44ae426082
"""),
    'basi0g02': _dehex(b"""
89504e470d0a1a0a0000000d49484452000000200000002002000000016ba60d
1f0000000467414d41000186a031e8965f0000005149444154789c635062e860
00e17286bb609c93c370ec189494960631366e4467b3ae675dcf10f521ea0303
90c1ca006444e11643482064114a4852c710baea3f18c31918020c30410403a6
0ac1a09239009c52804d85b6d97d0000000049454e44ae426082
"""),
    'basi0g04': _dehex(b"""
89504e470d0a1a0a0000000d4948445200000020000000200400000001e4e6f8
bf0000000467414d41000186a031e8965f000000ae49444154789c658e5111c2
301044171c141c141c041c843a287510ea20d441c041c141c141c04191102454
03994998cecd7edcecedbb9bdbc3b2c2b6457545fbc4bac1be437347f7c66a77
3c23d60db15e88f5c5627338a5416c2e691a9b475a89cd27eda12895ae8dfdab
43d61e590764f5c83a226b40d669bec307f93247701687723abf31ff83a2284b
a5b4ae6b63ac6520ad730ca4ed7b06d20e030369bd6720ed383290360406d24e
13811f2781eba9d34d07160000000049454e44ae426082
"""),
    'basi0g08': _dehex(b"""
89504e470d0a1a0a0000000d4948445200000020000000200800000001211615
be0000000467414d41000186a031e8965f000000b549444154789cb5905d0ac2
3010849dbac81c42c47bf843cf253e8878b0aa17110f214bdca6be240f5d21a5
94ced3e49bcd322c1624115515154998aa424822a82a5624a1aa8a8b24c58f99
999908130989a04a00d76c2c09e76cf21adcb209393a6553577da17140a2c59e
70ecbfa388dff1f03b82fb82bd07f05f7cb13f80bb07ad2fd60c011c3c588eef
f1f4e03bbec7ce832dca927aea005e431b625796345307b019c845e6bfc3bb98
769d84f9efb02ea6c00f9bb9ff45e81f9f280000000049454e44ae426082
"""),
    'basi0g16': _dehex(b"""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"""),
    'basi2c08': _dehex(b"""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"""),
    'basi2c16': _dehex(b"""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"""),
    'basi3p08': _dehex(b"""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"""),
    'basi6a08': _dehex(b"""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"""),
    'basn0g01': _dehex(b"""
89504e470d0a1a0a0000000d49484452000000200000002001000000005b0147
590000000467414d41000186a031e8965f0000005b49444154789c2dccb10903
300c05d1ebd204b24a200b7a346f90153c82c18d0a61450751f1e08a2faaead2
a4846ccea9255306e753345712e211b221bf4b263d1b427325255e8bdab29e6f
6aca30692e9d29616ee96f3065f0bf1f1087492fd02f14c90000000049454e44
ae426082
"""),
    'basn0g02': _dehex(b"""
89504e470d0a1a0a0000000d49484452000000200000002002000000001ca13d
890000000467414d41000186a031e8965f0000001f49444154789c6360085df5
1f8cf1308850c20053868f0133091f6390b90700bd497f818b0989a900000000
49454e44ae426082
"""),
    # A version of basn0g04 dithered down to 3 bits.
    'Basn0g03': _dehex(b"""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"""),
    'basn0g04': _dehex(b"""
89504e470d0a1a0a0000000d494844520000002000000020040000000093e1c8
290000000467414d41000186a031e8965f0000004849444154789c6360601014
545232367671090d4d4b2b2f6720430095dbd1418e002a77e64c720450b9ab56
912380caddbd9b1c0154ee9933e408a072efde25470095fbee1d1902001f14ee
01eaff41fa0000000049454e44ae426082
"""),
    'basn0g08': _dehex(b"""
89504e470d0a1a0a0000000d4948445200000020000000200800000000561125
280000000467414d41000186a031e8965f0000004149444154789c6364602400
1408c8b30c05058c0f0829f8f71f3f6079301c1430ca11906764a2795c0c0605
8c8ff0cafeffcff887e67131181430cae0956564040050e5fe7135e2d8590000
000049454e44ae426082
"""),
    'basn0g16': _dehex(b"""
89504e470d0a1a0a0000000d49484452000000200000002010000000000681f9
6b0000000467414d41000186a031e8965f0000005e49444154789cd5d2310ac0
300c4351395bef7fc6dca093c0287b32d52a04a3d98f3f3880a7b857131363a0
3a82601d089900dd82f640ca04e816dc06422640b7a03d903201ba05b7819009
d02d680fa44c603f6f07ec4ff41938cf7f0016d84bd85fae2b9fd70000000049
454e44ae426082
"""),
    'basn2c08': _dehex(b"""
89504e470d0a1a0a0000000d4948445200000020000000200802000000fc18ed
a30000000467414d41000186a031e8965f0000004849444154789cedd5c10900
300c024085ec91fdb772133b442bf4a1f8cee12bb40d043b800a14f81ca0ede4
7d4c784081020f4a871fc284071428f0a0743823a94081bb7077a3c00182b1f9
5e0f40cf4b0000000049454e44ae426082
"""),
    'basn2c16': _dehex(b"""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"""),
    'basn3p04': _dehex(b"""
89504e470d0a1a0a0000000d4948445200000020000000200403000000815467
c70000000467414d41000186a031e8965f000000037342495404040477f8b5a3
0000002d504c54452200ff00ffff8800ff22ff000099ffff6600dd00ff77ff00
ff000000ff99ddff00ff00bbffbb000044ff00ff44d2b049bd00000047494441
54789c63e8e8080d3d7366d5aaf27263e377ef66ce64204300952b28488e002a
d7c5851c0154eeddbbe408a07119c81140e52a29912380ca4d4b23470095bb7b
37190200e0c4ead10f82057d0000000049454e44ae426082
"""),
    'basn6a08': _dehex(b"""
89504e470d0a1a0a0000000d4948445200000020000000200806000000737a7a
f40000000467414d41000186a031e8965f0000006f49444154789cedd6310a80
300c46e12764684fa1f73f55048f21c4ddc545781d52e85028fc1f4d28d98a01
305e7b7e9cffba33831d75054703ca06a8f90d58a0074e351e227d805c8254e3
1bb0420f5cdc2e0079208892ffe2a00136a07b4007943c1004d900195036407f
011bf00052201a9c160fb84c0000000049454e44ae426082
"""),
    'cs3n3p08': _dehex(b"""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"""),
    'f02n0g08': _dehex(b"""
89504e470d0a1a0a0000000d4948445200000020000000200800000000561125
280000012a49444154789c85d12f4b83511805f0c3f938168b2088200882410c
03834dd807182c588749300c5604c30b0b03c360e14d826012c162b1182c8241
100441f47dee5fc3a6f7b9efc2bdf9c7e59cf370703a3caf26d3faeae6f6fee1
f1e9f9e5f5edfde3f3ebbb31d6f910227f1a6944448c31d65aebac77de7b1f42
883146444a41b029084a41500a825210340541d1e2607f777b733d13344a7401
00c8046d127da09a4ceb5cd024010c45446a40e5a04d029827055452da247ac7
f32e80ea42a7c4a20ba0dad22e892ea0f6a06b8b3e50a9c5e85ae264d1e54fd0
e762040cb2d5e93331067af95de8b4980147adcb3128710d74dab7a54fe20ec0
ec727c313a53822109fc3ff50743122bab6b1b5b3b7b9d439d834189e5d54518
0b82b120180b82b1208882200ae217e9e497bfbfccebfd0000000049454e44ae
426082
"""),
    's09n3p02': _dehex(b"""
89504e470d0a1a0a0000000d49484452000000090000000902030000009dffee
830000000467414d41000186a031e8965f000000037342495404040477f8b5a3
0000000c504c544500ff000077ffff00ffff7700ff5600640000001f49444154
789c63600002fbff0c0c56ab19182ca381581a4283f82071200000696505c36a
437f230000000049454e44ae426082
"""),
    'tbgn3p08': _dehex(b"""
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}

for name, data in png.items():
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