mirror of
https://github.com/NaitLee/Cat-Printer.git
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403a23415a
Remove `COPYING` for being identified as "unknown", moved to readme Few fixes to readme and contributing More in TODO & dev-diary
98 lines
3.6 KiB
Python
98 lines
3.6 KiB
Python
'''
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Provide *very* basic CUPS/IPP support
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Copyright © 2021-2022 NaitLee Soft. No rights reserved.
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License CC0-1.0-only: https://directory.fsf.org/wiki/License:CC0
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'''
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import io
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import platform
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import subprocess
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from .pf2 import int16be, int32be
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def int8(b: bytes):
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'Translate 1 byte as signed 8-bit int'
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u = b[0]
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return u - ((u >> 7 & 0b1) << 8)
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class IPP():
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'https://datatracker.ietf.org/doc/html/rfc8010'
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server = None
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def __init__(self, server):
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self.server = server
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def handle_ipp(self):
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'Handle an IPP protocol request'
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server = self.server
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content_length = int(server.headers.get('Content-Length'))
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buffer = io.BytesIO(server.rfile.read(content_length))
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_ipp_version = (int8(buffer.read(1)), int8(buffer.read(1)))
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_ipp_operation_id = int16be(buffer.read(2))
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_ipp_request_id = int32be(buffer.read(4))
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ipp_operation_attributes_tag = int8(buffer.read(1))
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attributes = {}
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data = b''
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if ipp_operation_attributes_tag == 0x01:
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while int8(buffer.read(1)) != 0x03:
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buffer.seek(-1, 1)
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tag = int8(buffer.read(1))
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if tag < 0x10: # delimiter-tag
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continue
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name = buffer.read(int16be(buffer.read(2)))
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value = buffer.read(int16be(buffer.read(2)))
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attributes[name] = (tag, value)
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data = buffer.read()
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# there are hard coded minimal response. this "just works" on cups
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if data == b'':
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try:
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server.send_response(200)
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server.send_header('Content-Type', 'application/ipp')
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server.end_headers()
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server.wfile.write(
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b'\x01\x01\x00\x00\x00\x00\x00\x01\x01\x03'
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)
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except BrokenPipeError:
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pass
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return
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if data.startswith(b'%!PS-Adobe'):
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self.handle_postscript(data)
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else:
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identifier = server.path[1:]
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server.printer.print(io.BytesIO(data), mode='text', identifier=identifier)
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def handle_postscript(self, data):
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'Print PostScript data to printer, converting to PBM first with GhostScript `gs`'
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server = self.server
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platform_system = platform.system()
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# https://ghostscript.com/doc/9.54.0/Use.htm#Output_device
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if platform_system == 'Windows':
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gsexe = 'gswin32c.exe'
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elif platform_system == 'OS/2':
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gsexe = 'gsos2'
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else:
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gsexe = 'gs'
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gsproc = subprocess.Popen([
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gsexe,
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'-q', '-sDEVICE=pbmraw', '-dNOPAUSE', '-dBATCH', '-dSAFER',
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'-dFIXEDMEDIA', '-g384x543', '-r46.4441219158x46.4441219158',
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'-dFitPage', '-dFitPage',
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'-sOutputFile=-', '-'
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], executable=gsexe, stdin=subprocess.PIPE, stdout=subprocess.PIPE)
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pbm_data, _ = gsproc.communicate(data)
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try:
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if gsproc.wait() == 0:
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identifier = server.path[1:]
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# TODO: Make IPP can report some errors
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server.printer.print(io.BytesIO(pbm_data), mode='pbm', identifier=identifier)
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else:
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raise Exception('Error on invoking Ghostscript')
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server.send_response(200)
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server.send_header('Content-Type', 'application/ipp')
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server.end_headers()
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server.wfile.write(
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b'\x01\x01\x00\x00\x00\x00\x00\x01\x01\x03'
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)
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except Exception as _:
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server.send_response(500)
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server.send_header('Content-Type', 'application/ipp')
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server.end_headers()
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