630 lines
21 KiB
Python
630 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 (
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Any,
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Callable,
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Dict,
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Iterator,
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List,
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MutableSequence,
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Optional,
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Sequence,
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Union,
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cast,
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)
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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:
|
|
if i < 0:
|
|
return "[]" + "".join(str(b) for b in self._refline)
|
|
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
|