Read one page from the file. Return True if successful, False if there were no more pages.
(self)
| 861 | return self._chars[code] |
| 862 | |
| 863 | def _read(self): |
| 864 | """ |
| 865 | Read one page from the file. Return True if successful, |
| 866 | False if there were no more pages. |
| 867 | """ |
| 868 | packet_char = packet_ends = None |
| 869 | packet_len = packet_width = None |
| 870 | while True: |
| 871 | byte = self.file.read(1)[0] |
| 872 | # If we are in a packet, execute the dvi instructions |
| 873 | if self.state is _dvistate.inpage: |
| 874 | byte_at = self.file.tell()-1 |
| 875 | if byte_at == packet_ends: |
| 876 | self._finalize_packet(packet_char, packet_width) |
| 877 | packet_len = packet_char = packet_width = None |
| 878 | # fall through to out-of-packet code |
| 879 | elif byte_at > packet_ends: |
| 880 | raise ValueError("Packet length mismatch in vf file") |
| 881 | else: |
| 882 | if byte in (139, 140) or byte >= 243: |
| 883 | raise ValueError(f"Inappropriate opcode {byte} in vf file") |
| 884 | Dvi._dtable[byte](self, byte) |
| 885 | continue |
| 886 | |
| 887 | # We are outside a packet |
| 888 | if byte < 242: # a short packet (length given by byte) |
| 889 | packet_len = byte |
| 890 | packet_char = self._read_arg(1) |
| 891 | packet_width = self._read_arg(3) |
| 892 | packet_ends = self._init_packet(byte) |
| 893 | self.state = _dvistate.inpage |
| 894 | elif byte == 242: # a long packet |
| 895 | packet_len = self._read_arg(4) |
| 896 | packet_char = self._read_arg(4) |
| 897 | packet_width = self._read_arg(4) |
| 898 | self._init_packet(packet_len) |
| 899 | elif 243 <= byte <= 246: |
| 900 | k = self._read_arg(byte - 242, byte == 246) |
| 901 | c = self._read_arg(4) |
| 902 | s = self._read_arg(4) |
| 903 | d = self._read_arg(4) |
| 904 | a = self._read_arg(1) |
| 905 | l = self._read_arg(1) |
| 906 | self._fnt_def_real(k, c, s, d, a, l) |
| 907 | if self._first_font is None: |
| 908 | self._first_font = k |
| 909 | elif byte == 247: # preamble |
| 910 | i = self._read_arg(1) |
| 911 | k = self._read_arg(1) |
| 912 | x = self.file.read(k) |
| 913 | cs = self._read_arg(4) |
| 914 | ds = self._read_arg(4) |
| 915 | self._pre(i, x, cs, ds) |
| 916 | elif byte == 248: # postamble (just some number of 248s) |
| 917 | break |
| 918 | else: |
| 919 | raise ValueError(f"Unknown vf opcode {byte}") |
| 920 |
no test coverage detected