mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
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70 lines
2.7 KiB
Python
70 lines
2.7 KiB
Python
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# Copyright (c) 2018 Atmosphere-NX
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#
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# This program is free software; you can redistribute it and/or modify it
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# under the terms and conditions of the GNU General Public License,
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# version 2, as published by the Free Software Foundation.
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#
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# This program is distributed in the hope it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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# more details.
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#
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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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import usb, zlib
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from struct import unpack as up, pack as pk
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def crc32(s):
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return zlib.crc32(s) & 0xFFFFFFFF
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class UsbInterface():
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def __init__(self):
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self.dev = usb.core.find(idVendor=0x057e, idProduct=0x3000)
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if self.dev is None:
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raise ValueError('Device not found')
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self.dev.set_configuration()
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self.cfg = self.dev.get_active_configuration()
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self.intf = usb.util.find_descriptor(self.cfg, bInterfaceClass=0xff, bInterfaceSubClass=0xff, bInterfaceProtocol=0xfc)
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assert self.intf is not None
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self.ep_in = usb.util.find_descriptor(
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self.intf,
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custom_match = \
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lambda e: \
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usb.util.endpoint_direction(e.bEndpointAddress) == \
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usb.util.ENDPOINT_IN)
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assert self.ep_in is not None
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self.ep_out = usb.util.find_descriptor(
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self.intf,
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custom_match = \
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lambda e: \
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usb.util.endpoint_direction(e.bEndpointAddress) == \
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usb.util.ENDPOINT_OUT)
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assert self.ep_out is not None
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def close(self):
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usb.util.dispose_resources(self.dev)
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def blocking_read(self, size):
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return ''.join(chr(x) for x in self.ep_in.read(size, 0xFFFFFFFFFFFFFFFF))
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def blocking_write(self, data):
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self.ep_out.write(data, 0xFFFFFFFFFFFFFFFF)
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def read_packet(self):
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hdr = self.blocking_read(0x28)
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_, _, _, body_size, _, _, _, _, body_chk, hdr_chk = up('<IIIIIIIIII', hdr)
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if crc32(hdr[:-4]) != hdr_chk:
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raise ValueError('Invalid header checksum in received packet!')
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body = self.blocking_read(body_size)
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if len(body) != body_size:
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raise ValueError('Failed to receive packet body!')
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elif crc32(body) != body_chk:
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raise ValueError('Invalid body checksum in received packet!')
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return (hdr, body)
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def send_packet(self, body):
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hdr = pk('<IIIIIIIII', 0, 0, 0, len(body), 0, 0, 0, 0, crc32(body))
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hdr += pk('<I', crc32(hdr))
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self.blocking_write(hdr)
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self.blocking_write(body)
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