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Darko
62 lines
1.5 KiB
Python
62 lines
1.5 KiB
Python
#!/usr/bin/python
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"""
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Basic yEnc decoder.
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Copyright (C) 2013 Byron Platt
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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"""
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#NOTE: docstrings beed to be added
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import re
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import zlib
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import struct
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import binascii
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_crc32_re = re.compile(r"\s+crc(?:32)?=([0-9a-fA-F]{8})")
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def crc32(trailer):
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match = _crc32_re.search(trailer)
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if not match:
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return None
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buf = binascii.unhexlify(match.group(1))
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return struct.unpack(">I", buf)[0]
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def decode(buff, escape=0, crc32=0):
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decoded = ""
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for c in buff:
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byte = ord(c)
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if escape:
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byte = (byte - 106) & 0xff
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escape = 0
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elif byte == 0x3d:
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escape = 1
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continue
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elif byte == 0x0d or byte == 0x0a:
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continue
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else:
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byte = (byte - 42) & 0xff
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decoded += chr(byte)
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crc32 = zlib.crc32(decoded, crc32)
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return decoded, escape, crc32
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