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Name	Size	Permission	Date
__pycache__	[ DIR ]	drwxr-sr-x	2025-04-10 17:08
cmap	[ DIR ]	drwxr-sr-x	2025-04-10 17:08
__init__.py	76 B	-rw-r--r--	2025-04-10 17:07
arcfour.py	886 B	-rw-r--r--	2025-04-10 17:07
ascii85.py	1.98 KB	-rw-r--r--	2025-04-10 17:07
ccitt.py	19.53 KB	-rw-r--r--	2025-04-10 17:07
cmapdb.py	11.79 KB	-rw-r--r--	2025-04-10 17:07
converter.py	21.07 KB	-rw-r--r--	2025-04-10 17:07
encodingdb.py	3.47 KB	-rw-r--r--	2025-04-10 17:07
fontmetrics.py	56.62 KB	-rw-r--r--	2025-04-10 17:07
glyphlist.py	114.46 KB	-rw-r--r--	2025-04-10 17:07
high_level.py	6.17 KB	-rw-r--r--	2025-04-10 17:07
image.py	5.38 KB	-rw-r--r--	2025-04-10 17:07
jbig2.py	9.48 KB	-rw-r--r--	2025-04-10 17:07
latin_enc.py	7.73 KB	-rw-r--r--	2025-04-10 17:07
layout.py	28.65 KB	-rw-r--r--	2025-04-10 17:07
lzw.py	2.74 KB	-rw-r--r--	2025-04-10 17:07
pdfcolor.py	779 B	-rw-r--r--	2025-04-10 17:07
pdfdevice.py	5.84 KB	-rw-r--r--	2025-04-10 17:07
pdfdocument.py	26.63 KB	-rw-r--r--	2025-04-10 17:07
pdffont.py	29.31 KB	-rw-r--r--	2025-04-10 17:07
pdfinterp.py	28.35 KB	-rw-r--r--	2025-04-10 17:07
pdfpage.py	5.18 KB	-rw-r--r--	2025-04-10 17:07
pdfparser.py	5.18 KB	-rw-r--r--	2025-04-10 17:07
pdftypes.py	9.36 KB	-rw-r--r--	2025-04-10 17:07
psparser.py	16.76 KB	-rw-r--r--	2025-04-10 17:07
rijndael.py	45.34 KB	-rw-r--r--	2025-04-10 17:07
runlength.py	1.29 KB	-rw-r--r--	2025-04-10 17:07
settings.py	15 B	-rw-r--r--	2025-04-10 17:07
utils.py	11.97 KB	-rw-r--r--	2025-04-10 17:07

Rename

""" Python implementation of ASCII85/ASCIIHex decoder (Adobe version).

This code is in the public domain.

"""

import re
import struct

# ascii85decode(data)
def ascii85decode(data):
    """
    In ASCII85 encoding, every four bytes are encoded with five ASCII
    letters, using 85 different types of characters (as 256**4 < 85**5).
    When the length of the original bytes is not a multiple of 4, a special
    rule is used for round up.

The Adobe's ASCII85 implementation is slightly different from
    its original in handling the last characters.

"""
    n = b = 0
    out = b''
    for i in iter(data):
        c = bytes((i,))
        if b'!' <= c and c <= b'u':
            n += 1
            b = b*85+(ord(c)-33)
            if n == 5:
                out += struct.pack('>L', b)
                n = b = 0
        elif c == b'z':
            assert n == 0, str(n)
            out += b'\0\0\0\0'
        elif c == b'~':
            if n:
                for _ in range(5-n):
                    b = b*85+84
                out += struct.pack('>L', b)[:n-1]
            break
    return out

# asciihexdecode(data)
hex_re = re.compile(br'([a-f\d]{2})', re.IGNORECASE)
trail_re = re.compile(br'^(?:[a-f\d]{2}|\s)*([a-f\d])[\s>]*$', re.IGNORECASE)

def asciihexdecode(data):
    """
    ASCIIHexDecode filter: PDFReference v1.4 section 3.3.1
    For each pair of ASCII hexadecimal digits (0-9 and A-F or a-f), the
    ASCIIHexDecode filter produces one byte of binary data. All white-space
    characters are ignored. A right angle bracket character (>) indicates
    EOD. Any other characters will cause an error. If the filter encounters
    the EOD marker after reading an odd number of hexadecimal digits, it
    will behave as if a 0 followed the last digit.
    """
    def decode(x):
        i = int(x, 16)
        return bytes((i,))

out = b''
    for x in hex_re.findall(data):
        out += decode(x)

m = trail_re.search(data)
    if m:
        out += decode(m.group(1)+b'0')
    return out