610 lines
21 KiB
Python
610 lines
21 KiB
Python
# CCITT Fax decoder
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#
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# Bugs: uncompressed mode untested.
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#
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# cf.
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# ITU-T Recommendation T.4
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# "Standardization of Group 3 facsimile terminals
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# for document transmission"
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# ITU-T Recommendation T.6
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# "FACSIMILE CODING SCHEMES AND CODING CONTROL FUNCTIONS
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# FOR GROUP 4 FACSIMILE APPARATUS"
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import array
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from typing import (Any, Callable, Dict, Iterator, List, MutableSequence,
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Optional, Sequence, Union, cast)
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def get_bytes(data: bytes) -> Iterator[int]:
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yield from data
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# Workaround https://github.com/python/mypy/issues/731
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BitParserState = MutableSequence[Any]
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# A better definition (not supported by mypy) would be:
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# BitParserState = MutableSequence[Union["BitParserState", int, str, None]]
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class BitParser:
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_state: BitParserState
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# _accept is declared Optional solely as a workaround for
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# https://github.com/python/mypy/issues/708
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_accept: Optional[Callable[[Any], BitParserState]]
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def __init__(self) -> None:
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self._pos = 0
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@classmethod
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def add(cls, root: BitParserState, v: Union[int, str], bits: str) -> None:
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p: BitParserState = root
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b = None
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for i in range(len(bits)):
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if 0 < i:
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assert b is not None
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if p[b] is None:
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p[b] = [None, None]
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p = p[b]
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if bits[i] == '1':
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b = 1
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else:
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b = 0
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assert b is not None
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p[b] = v
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def feedbytes(self, data: bytes) -> None:
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for byte in get_bytes(data):
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for m in (128, 64, 32, 16, 8, 4, 2, 1):
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self._parse_bit(byte & m)
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def _parse_bit(self, x: object) -> None:
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if x:
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v = self._state[1]
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else:
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v = self._state[0]
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self._pos += 1
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if isinstance(v, list):
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self._state = v
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else:
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assert self._accept is not None
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self._state = self._accept(v)
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class CCITTG4Parser(BitParser):
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MODE = [None, None]
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BitParser.add(MODE, 0, '1')
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BitParser.add(MODE, +1, '011')
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BitParser.add(MODE, -1, '010')
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BitParser.add(MODE, 'h', '001')
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BitParser.add(MODE, 'p', '0001')
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BitParser.add(MODE, +2, '000011')
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BitParser.add(MODE, -2, '000010')
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BitParser.add(MODE, +3, '0000011')
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BitParser.add(MODE, -3, '0000010')
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BitParser.add(MODE, 'u', '0000001111')
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BitParser.add(MODE, 'x1', '0000001000')
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BitParser.add(MODE, 'x2', '0000001001')
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BitParser.add(MODE, 'x3', '0000001010')
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BitParser.add(MODE, 'x4', '0000001011')
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BitParser.add(MODE, 'x5', '0000001100')
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BitParser.add(MODE, 'x6', '0000001101')
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BitParser.add(MODE, 'x7', '0000001110')
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BitParser.add(MODE, 'e', '000000000001000000000001')
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WHITE = [None, None]
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BitParser.add(WHITE, 0, '00110101')
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BitParser.add(WHITE, 1, '000111')
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BitParser.add(WHITE, 2, '0111')
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BitParser.add(WHITE, 3, '1000')
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BitParser.add(WHITE, 4, '1011')
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BitParser.add(WHITE, 5, '1100')
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BitParser.add(WHITE, 6, '1110')
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BitParser.add(WHITE, 7, '1111')
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BitParser.add(WHITE, 8, '10011')
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BitParser.add(WHITE, 9, '10100')
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BitParser.add(WHITE, 10, '00111')
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BitParser.add(WHITE, 11, '01000')
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BitParser.add(WHITE, 12, '001000')
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BitParser.add(WHITE, 13, '000011')
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BitParser.add(WHITE, 14, '110100')
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BitParser.add(WHITE, 15, '110101')
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BitParser.add(WHITE, 16, '101010')
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BitParser.add(WHITE, 17, '101011')
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BitParser.add(WHITE, 18, '0100111')
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BitParser.add(WHITE, 19, '0001100')
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BitParser.add(WHITE, 20, '0001000')
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BitParser.add(WHITE, 21, '0010111')
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BitParser.add(WHITE, 22, '0000011')
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BitParser.add(WHITE, 23, '0000100')
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BitParser.add(WHITE, 24, '0101000')
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BitParser.add(WHITE, 25, '0101011')
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BitParser.add(WHITE, 26, '0010011')
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BitParser.add(WHITE, 27, '0100100')
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BitParser.add(WHITE, 28, '0011000')
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BitParser.add(WHITE, 29, '00000010')
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BitParser.add(WHITE, 30, '00000011')
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BitParser.add(WHITE, 31, '00011010')
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BitParser.add(WHITE, 32, '00011011')
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BitParser.add(WHITE, 33, '00010010')
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BitParser.add(WHITE, 34, '00010011')
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BitParser.add(WHITE, 35, '00010100')
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BitParser.add(WHITE, 36, '00010101')
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BitParser.add(WHITE, 37, '00010110')
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BitParser.add(WHITE, 38, '00010111')
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BitParser.add(WHITE, 39, '00101000')
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BitParser.add(WHITE, 40, '00101001')
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BitParser.add(WHITE, 41, '00101010')
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BitParser.add(WHITE, 42, '00101011')
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BitParser.add(WHITE, 43, '00101100')
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BitParser.add(WHITE, 44, '00101101')
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BitParser.add(WHITE, 45, '00000100')
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BitParser.add(WHITE, 46, '00000101')
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BitParser.add(WHITE, 47, '00001010')
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BitParser.add(WHITE, 48, '00001011')
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BitParser.add(WHITE, 49, '01010010')
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BitParser.add(WHITE, 50, '01010011')
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BitParser.add(WHITE, 51, '01010100')
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BitParser.add(WHITE, 52, '01010101')
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BitParser.add(WHITE, 53, '00100100')
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BitParser.add(WHITE, 54, '00100101')
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BitParser.add(WHITE, 55, '01011000')
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BitParser.add(WHITE, 56, '01011001')
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BitParser.add(WHITE, 57, '01011010')
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BitParser.add(WHITE, 58, '01011011')
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BitParser.add(WHITE, 59, '01001010')
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BitParser.add(WHITE, 60, '01001011')
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BitParser.add(WHITE, 61, '00110010')
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BitParser.add(WHITE, 62, '00110011')
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BitParser.add(WHITE, 63, '00110100')
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BitParser.add(WHITE, 64, '11011')
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BitParser.add(WHITE, 128, '10010')
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BitParser.add(WHITE, 192, '010111')
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BitParser.add(WHITE, 256, '0110111')
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BitParser.add(WHITE, 320, '00110110')
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BitParser.add(WHITE, 384, '00110111')
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BitParser.add(WHITE, 448, '01100100')
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BitParser.add(WHITE, 512, '01100101')
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BitParser.add(WHITE, 576, '01101000')
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BitParser.add(WHITE, 640, '01100111')
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BitParser.add(WHITE, 704, '011001100')
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BitParser.add(WHITE, 768, '011001101')
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BitParser.add(WHITE, 832, '011010010')
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BitParser.add(WHITE, 896, '011010011')
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BitParser.add(WHITE, 960, '011010100')
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BitParser.add(WHITE, 1024, '011010101')
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BitParser.add(WHITE, 1088, '011010110')
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BitParser.add(WHITE, 1152, '011010111')
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BitParser.add(WHITE, 1216, '011011000')
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BitParser.add(WHITE, 1280, '011011001')
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BitParser.add(WHITE, 1344, '011011010')
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BitParser.add(WHITE, 1408, '011011011')
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BitParser.add(WHITE, 1472, '010011000')
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BitParser.add(WHITE, 1536, '010011001')
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BitParser.add(WHITE, 1600, '010011010')
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BitParser.add(WHITE, 1664, '011000')
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BitParser.add(WHITE, 1728, '010011011')
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BitParser.add(WHITE, 1792, '00000001000')
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BitParser.add(WHITE, 1856, '00000001100')
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BitParser.add(WHITE, 1920, '00000001101')
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BitParser.add(WHITE, 1984, '000000010010')
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BitParser.add(WHITE, 2048, '000000010011')
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BitParser.add(WHITE, 2112, '000000010100')
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BitParser.add(WHITE, 2176, '000000010101')
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BitParser.add(WHITE, 2240, '000000010110')
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BitParser.add(WHITE, 2304, '000000010111')
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BitParser.add(WHITE, 2368, '000000011100')
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BitParser.add(WHITE, 2432, '000000011101')
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BitParser.add(WHITE, 2496, '000000011110')
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BitParser.add(WHITE, 2560, '000000011111')
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BLACK = [None, None]
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BitParser.add(BLACK, 0, '0000110111')
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BitParser.add(BLACK, 1, '010')
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BitParser.add(BLACK, 2, '11')
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BitParser.add(BLACK, 3, '10')
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BitParser.add(BLACK, 4, '011')
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BitParser.add(BLACK, 5, '0011')
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BitParser.add(BLACK, 6, '0010')
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BitParser.add(BLACK, 7, '00011')
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BitParser.add(BLACK, 8, '000101')
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BitParser.add(BLACK, 9, '000100')
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BitParser.add(BLACK, 10, '0000100')
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BitParser.add(BLACK, 11, '0000101')
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BitParser.add(BLACK, 12, '0000111')
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BitParser.add(BLACK, 13, '00000100')
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BitParser.add(BLACK, 14, '00000111')
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BitParser.add(BLACK, 15, '000011000')
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BitParser.add(BLACK, 16, '0000010111')
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BitParser.add(BLACK, 17, '0000011000')
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BitParser.add(BLACK, 18, '0000001000')
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BitParser.add(BLACK, 19, '00001100111')
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BitParser.add(BLACK, 20, '00001101000')
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BitParser.add(BLACK, 21, '00001101100')
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BitParser.add(BLACK, 22, '00000110111')
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BitParser.add(BLACK, 23, '00000101000')
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BitParser.add(BLACK, 24, '00000010111')
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BitParser.add(BLACK, 25, '00000011000')
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BitParser.add(BLACK, 26, '000011001010')
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BitParser.add(BLACK, 27, '000011001011')
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BitParser.add(BLACK, 28, '000011001100')
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BitParser.add(BLACK, 29, '000011001101')
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BitParser.add(BLACK, 30, '000001101000')
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BitParser.add(BLACK, 31, '000001101001')
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BitParser.add(BLACK, 32, '000001101010')
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BitParser.add(BLACK, 33, '000001101011')
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BitParser.add(BLACK, 34, '000011010010')
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BitParser.add(BLACK, 35, '000011010011')
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BitParser.add(BLACK, 36, '000011010100')
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BitParser.add(BLACK, 37, '000011010101')
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BitParser.add(BLACK, 38, '000011010110')
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BitParser.add(BLACK, 39, '000011010111')
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BitParser.add(BLACK, 40, '000001101100')
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BitParser.add(BLACK, 41, '000001101101')
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BitParser.add(BLACK, 42, '000011011010')
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BitParser.add(BLACK, 43, '000011011011')
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BitParser.add(BLACK, 44, '000001010100')
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BitParser.add(BLACK, 45, '000001010101')
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BitParser.add(BLACK, 46, '000001010110')
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BitParser.add(BLACK, 47, '000001010111')
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BitParser.add(BLACK, 48, '000001100100')
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BitParser.add(BLACK, 49, '000001100101')
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BitParser.add(BLACK, 50, '000001010010')
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BitParser.add(BLACK, 51, '000001010011')
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BitParser.add(BLACK, 52, '000000100100')
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BitParser.add(BLACK, 53, '000000110111')
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BitParser.add(BLACK, 54, '000000111000')
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BitParser.add(BLACK, 55, '000000100111')
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BitParser.add(BLACK, 56, '000000101000')
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BitParser.add(BLACK, 57, '000001011000')
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BitParser.add(BLACK, 58, '000001011001')
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BitParser.add(BLACK, 59, '000000101011')
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BitParser.add(BLACK, 60, '000000101100')
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BitParser.add(BLACK, 61, '000001011010')
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BitParser.add(BLACK, 62, '000001100110')
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BitParser.add(BLACK, 63, '000001100111')
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BitParser.add(BLACK, 64, '0000001111')
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BitParser.add(BLACK, 128, '000011001000')
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BitParser.add(BLACK, 192, '000011001001')
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BitParser.add(BLACK, 256, '000001011011')
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BitParser.add(BLACK, 320, '000000110011')
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BitParser.add(BLACK, 384, '000000110100')
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BitParser.add(BLACK, 448, '000000110101')
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BitParser.add(BLACK, 512, '0000001101100')
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BitParser.add(BLACK, 576, '0000001101101')
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BitParser.add(BLACK, 640, '0000001001010')
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BitParser.add(BLACK, 704, '0000001001011')
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BitParser.add(BLACK, 768, '0000001001100')
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BitParser.add(BLACK, 832, '0000001001101')
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BitParser.add(BLACK, 896, '0000001110010')
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BitParser.add(BLACK, 960, '0000001110011')
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BitParser.add(BLACK, 1024, '0000001110100')
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BitParser.add(BLACK, 1088, '0000001110101')
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BitParser.add(BLACK, 1152, '0000001110110')
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BitParser.add(BLACK, 1216, '0000001110111')
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BitParser.add(BLACK, 1280, '0000001010010')
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BitParser.add(BLACK, 1344, '0000001010011')
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BitParser.add(BLACK, 1408, '0000001010100')
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BitParser.add(BLACK, 1472, '0000001010101')
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BitParser.add(BLACK, 1536, '0000001011010')
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BitParser.add(BLACK, 1600, '0000001011011')
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BitParser.add(BLACK, 1664, '0000001100100')
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BitParser.add(BLACK, 1728, '0000001100101')
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BitParser.add(BLACK, 1792, '00000001000')
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BitParser.add(BLACK, 1856, '00000001100')
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BitParser.add(BLACK, 1920, '00000001101')
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BitParser.add(BLACK, 1984, '000000010010')
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BitParser.add(BLACK, 2048, '000000010011')
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BitParser.add(BLACK, 2112, '000000010100')
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BitParser.add(BLACK, 2176, '000000010101')
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BitParser.add(BLACK, 2240, '000000010110')
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BitParser.add(BLACK, 2304, '000000010111')
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BitParser.add(BLACK, 2368, '000000011100')
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BitParser.add(BLACK, 2432, '000000011101')
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BitParser.add(BLACK, 2496, '000000011110')
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BitParser.add(BLACK, 2560, '000000011111')
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UNCOMPRESSED = [None, None]
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BitParser.add(UNCOMPRESSED, '1', '1')
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BitParser.add(UNCOMPRESSED, '01', '01')
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BitParser.add(UNCOMPRESSED, '001', '001')
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BitParser.add(UNCOMPRESSED, '0001', '0001')
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BitParser.add(UNCOMPRESSED, '00001', '00001')
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BitParser.add(UNCOMPRESSED, '00000', '000001')
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BitParser.add(UNCOMPRESSED, 'T00', '00000011')
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BitParser.add(UNCOMPRESSED, 'T10', '00000010')
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BitParser.add(UNCOMPRESSED, 'T000', '000000011')
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BitParser.add(UNCOMPRESSED, 'T100', '000000010')
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BitParser.add(UNCOMPRESSED, 'T0000', '0000000011')
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BitParser.add(UNCOMPRESSED, 'T1000', '0000000010')
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BitParser.add(UNCOMPRESSED, 'T00000', '00000000011')
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BitParser.add(UNCOMPRESSED, 'T10000', '00000000010')
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class EOFB(Exception):
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pass
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class InvalidData(Exception):
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pass
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class ByteSkip(Exception):
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pass
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_color: int
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def __init__(self, width: int, bytealign: bool = False) -> None:
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BitParser.__init__(self)
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self.width = width
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self.bytealign = bytealign
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self.reset()
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return
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def feedbytes(self, data: bytes) -> None:
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for byte in get_bytes(data):
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try:
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for m in (128, 64, 32, 16, 8, 4, 2, 1):
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self._parse_bit(byte & m)
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except self.ByteSkip:
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self._accept = self._parse_mode
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self._state = self.MODE
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except self.EOFB:
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break
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return
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def _parse_mode(self, mode: object) -> BitParserState:
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if mode == 'p':
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self._do_pass()
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self._flush_line()
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return self.MODE
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elif mode == 'h':
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self._n1 = 0
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self._accept = self._parse_horiz1
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if self._color:
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return self.WHITE
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else:
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return self.BLACK
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elif mode == 'u':
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self._accept = self._parse_uncompressed
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return self.UNCOMPRESSED
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elif mode == 'e':
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raise self.EOFB
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elif isinstance(mode, int):
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self._do_vertical(mode)
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self._flush_line()
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return self.MODE
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else:
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raise self.InvalidData(mode)
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def _parse_horiz1(self, n: Any) -> BitParserState:
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if n is None:
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raise self.InvalidData
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self._n1 += n
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if n < 64:
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self._n2 = 0
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self._color = 1-self._color
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self._accept = self._parse_horiz2
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if self._color:
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return self.WHITE
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else:
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return self.BLACK
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def _parse_horiz2(self, n: Any) -> BitParserState:
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if n is None:
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raise self.InvalidData
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self._n2 += n
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if n < 64:
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self._color = 1-self._color
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self._accept = self._parse_mode
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self._do_horizontal(self._n1, self._n2)
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self._flush_line()
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return self.MODE
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elif self._color:
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return self.WHITE
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else:
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return self.BLACK
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def _parse_uncompressed(self, bits: Optional[str]) -> BitParserState:
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if not bits:
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raise self.InvalidData
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if bits.startswith('T'):
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self._accept = self._parse_mode
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self._color = int(bits[1])
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self._do_uncompressed(bits[2:])
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return self.MODE
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else:
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self._do_uncompressed(bits)
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return self.UNCOMPRESSED
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def _get_bits(self) -> str:
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return ''.join(str(b) for b in self._curline[:self._curpos])
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def _get_refline(self, i: int) -> str:
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if i < 0:
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return '[]'+''.join(str(b) for b in self._refline)
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elif len(self._refline) <= i:
|
|
return ''.join(str(b) for b in self._refline)+'[]'
|
|
else:
|
|
return (''.join(str(b) for b in self._refline[:i]) +
|
|
'['+str(self._refline[i])+']' +
|
|
''.join(str(b) for b in self._refline[i+1:]))
|
|
|
|
def reset(self) -> None:
|
|
self._y = 0
|
|
self._curline = array.array('b', [1]*self.width)
|
|
self._reset_line()
|
|
self._accept = self._parse_mode
|
|
self._state = self.MODE
|
|
return
|
|
|
|
def output_line(self, y: int, bits: Sequence[int]) -> None:
|
|
print(y, ''.join(str(b) for b in bits))
|
|
return
|
|
|
|
def _reset_line(self) -> None:
|
|
self._refline = self._curline
|
|
self._curline = array.array('b', [1]*self.width)
|
|
self._curpos = -1
|
|
self._color = 1
|
|
return
|
|
|
|
def _flush_line(self) -> None:
|
|
if self.width <= self._curpos:
|
|
self.output_line(self._y, self._curline)
|
|
self._y += 1
|
|
self._reset_line()
|
|
if self.bytealign:
|
|
raise self.ByteSkip
|
|
return
|
|
|
|
def _do_vertical(self, dx: int) -> None:
|
|
x1 = self._curpos+1
|
|
while 1:
|
|
if x1 == 0:
|
|
if (self._color == 1 and self._refline[x1] != self._color):
|
|
break
|
|
elif x1 == len(self._refline):
|
|
break
|
|
elif (self._refline[x1-1] == self._color and
|
|
self._refline[x1] != self._color):
|
|
break
|
|
x1 += 1
|
|
x1 += dx
|
|
x0 = max(0, self._curpos)
|
|
x1 = max(0, min(self.width, x1))
|
|
if x1 < x0:
|
|
for x in range(x1, x0):
|
|
self._curline[x] = self._color
|
|
elif x0 < x1:
|
|
for x in range(x0, x1):
|
|
self._curline[x] = self._color
|
|
self._curpos = x1
|
|
self._color = 1-self._color
|
|
return
|
|
|
|
def _do_pass(self) -> None:
|
|
x1 = self._curpos+1
|
|
while 1:
|
|
if x1 == 0:
|
|
if (self._color == 1 and self._refline[x1] != self._color):
|
|
break
|
|
elif x1 == len(self._refline):
|
|
break
|
|
elif (self._refline[x1-1] == self._color and
|
|
self._refline[x1] != self._color):
|
|
break
|
|
x1 += 1
|
|
while 1:
|
|
if x1 == 0:
|
|
if (self._color == 0 and self._refline[x1] == self._color):
|
|
break
|
|
elif x1 == len(self._refline):
|
|
break
|
|
elif (self._refline[x1-1] != self._color and
|
|
self._refline[x1] == self._color):
|
|
break
|
|
x1 += 1
|
|
for x in range(self._curpos, x1):
|
|
self._curline[x] = self._color
|
|
self._curpos = x1
|
|
return
|
|
|
|
def _do_horizontal(self, n1: int, n2: int) -> None:
|
|
if self._curpos < 0:
|
|
self._curpos = 0
|
|
x = self._curpos
|
|
for _ in range(n1):
|
|
if len(self._curline) <= x:
|
|
break
|
|
self._curline[x] = self._color
|
|
x += 1
|
|
for _ in range(n2):
|
|
if len(self._curline) <= x:
|
|
break
|
|
self._curline[x] = 1-self._color
|
|
x += 1
|
|
self._curpos = x
|
|
return
|
|
|
|
def _do_uncompressed(self, bits: str) -> None:
|
|
for c in bits:
|
|
self._curline[self._curpos] = int(c)
|
|
self._curpos += 1
|
|
self._flush_line()
|
|
return
|
|
|
|
|
|
class CCITTFaxDecoder(CCITTG4Parser):
|
|
|
|
def __init__(self, width: int, bytealign: bool = False,
|
|
reversed: bool = False) -> None:
|
|
CCITTG4Parser.__init__(self, width, bytealign=bytealign)
|
|
self.reversed = reversed
|
|
self._buf = b''
|
|
return
|
|
|
|
def close(self) -> bytes:
|
|
return self._buf
|
|
|
|
def output_line(self, y: int, bits: Sequence[int]) -> None:
|
|
arr = array.array('B', [0]*((len(bits)+7)//8))
|
|
if self.reversed:
|
|
bits = [1-b for b in bits]
|
|
for (i, b) in enumerate(bits):
|
|
if b:
|
|
arr[i//8] += (128, 64, 32, 16, 8, 4, 2, 1)[i % 8]
|
|
self._buf += arr.tobytes()
|
|
return
|
|
|
|
|
|
def ccittfaxdecode(data: bytes, params: Dict[str, object]) -> bytes:
|
|
K = params.get('K')
|
|
if K == -1:
|
|
cols = cast(int, params.get('Columns'))
|
|
bytealign = cast(bool, params.get('EncodedByteAlign'))
|
|
reversed = cast(bool, params.get('BlackIs1'))
|
|
parser = CCITTFaxDecoder(cols, bytealign=bytealign, reversed=reversed)
|
|
else:
|
|
raise ValueError(K)
|
|
parser.feedbytes(data)
|
|
return parser.close()
|
|
|
|
|
|
# test
|
|
def main(argv: List[str]) -> None:
|
|
if not argv[1:]:
|
|
import unittest
|
|
unittest.main()
|
|
return
|
|
|
|
class Parser(CCITTG4Parser):
|
|
def __init__(self, width: int, bytealign: bool = False) -> None:
|
|
import pygame # type: ignore[import]
|
|
CCITTG4Parser.__init__(self, width, bytealign=bytealign)
|
|
self.img = pygame.Surface((self.width, 1000))
|
|
return
|
|
|
|
def output_line(self, y: int, bits: Sequence[int]) -> None:
|
|
for (x, b) in enumerate(bits):
|
|
if b:
|
|
self.img.set_at((x, y), (255, 255, 255))
|
|
else:
|
|
self.img.set_at((x, y), (0, 0, 0))
|
|
return
|
|
|
|
def close(self) -> None:
|
|
import pygame
|
|
pygame.image.save(self.img, 'out.bmp')
|
|
return
|
|
for path in argv[1:]:
|
|
fp = open(path, 'rb')
|
|
(_, _, k, w, h, _) = path.split('.')
|
|
parser = Parser(int(w))
|
|
parser.feedbytes(fp.read())
|
|
parser.close()
|
|
fp.close()
|
|
return
|