mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
synced 2024-11-18 18:06:40 +00:00
116 lines
3.8 KiB
Python
116 lines
3.8 KiB
Python
# Copyright (c) 2018 Atmosphere-NX
|
|
#
|
|
# This program is free software; you can redistribute it and/or modify it
|
|
# under the terms and conditions of the GNU General Public License,
|
|
# version 2, as published by the Free Software Foundation.
|
|
#
|
|
# This program is distributed in the hope it will be useful, but WITHOUT
|
|
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
|
# more details.
|
|
#
|
|
# You should have received a copy of the GNU General Public License
|
|
# along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
import zlib
|
|
import ServiceId
|
|
from struct import unpack as up, pack as pk
|
|
|
|
HEADER_SIZE = 0x28
|
|
|
|
def crc32(s):
|
|
return zlib.crc32(s) & 0xFFFFFFFF
|
|
|
|
class Packet():
|
|
def __init__(self):
|
|
self.service = 0
|
|
self.task = 0
|
|
self.cmd = 0
|
|
self.continuation = 0
|
|
self.version = 0
|
|
self.body_len = 0
|
|
self.body = ''
|
|
self.offset = 0
|
|
def load_header(self, header):
|
|
assert len(header) == HEADER_SIZE
|
|
self.service, self.task, self.cmd, self.continuation, self.version, self.body_len, \
|
|
_, self.body_chk, self.hdr_chk = up('<IIHBBI16sII', header)
|
|
if crc32(header[:-4]) != self.hdr_chk:
|
|
raise ValueError('Invalid header checksum in received packet!')
|
|
def load_body(self, body):
|
|
assert len(body) == self.body_len
|
|
if crc32(body) != self.body_chk:
|
|
raise ValueError('Invalid body checksum in received packet!')
|
|
self.body = body
|
|
def get_data(self):
|
|
assert len(self.body) == self.body_len and self.body_len <= 0xE000
|
|
self.body_chk = crc32(self.body)
|
|
hdr = pk('<IIHBBIIIIII', self.service, self.task, self.cmd, self.continuation, self.version, self.body_len, 0, 0, 0, 0, self.body_chk)
|
|
self.hdr_chk = crc32(hdr)
|
|
hdr += pk('<I', self.hdr_chk)
|
|
return hdr + self.body
|
|
def set_service(self, srv):
|
|
if type(srv) is str:
|
|
self.service = ServiceId.hash(srv)
|
|
else:
|
|
self.service = srv
|
|
return self
|
|
def set_task(self, t):
|
|
self.task = t
|
|
return self
|
|
def set_cmd(self, x):
|
|
self.cmd = x
|
|
return self
|
|
def set_continuation(self, c):
|
|
self.continuation = c
|
|
return self
|
|
def set_version(self, v):
|
|
self.version = v
|
|
return self
|
|
def reset_offset(self):
|
|
self.offset = 0
|
|
return self
|
|
def write_str(self, s):
|
|
self.body += s
|
|
self.body_len += len(s)
|
|
return self
|
|
def write_u8(self, x):
|
|
self.body += pk('<B', x & 0xFF)
|
|
self.body_len += 1
|
|
return self
|
|
def write_u16(self, x):
|
|
self.body += pk('<H', x & 0xFFFF)
|
|
self.body_len += 2
|
|
return self
|
|
def write_u32(self, x):
|
|
self.body += pk('<I', x & 0xFFFFFFFF)
|
|
self.body_len += 4
|
|
return self
|
|
def write_u64(self, x):
|
|
self.body += pk('<Q', x & 0xFFFFFFFFFFFFFFFF)
|
|
self.body_len += 8
|
|
return self
|
|
def read_str(self):
|
|
s = ''
|
|
while self.body[self.offset] != '\x00' and self.offset < self.body_len:
|
|
s += self.body[self.offset]
|
|
self.offset += 1
|
|
def read_u8(self):
|
|
x, = up('<B', self.body[self.offset:self.offset+1])
|
|
self.offset += 1
|
|
return x
|
|
def read_u16(self):
|
|
x, = up('<H', self.body[self.offset:self.offset+2])
|
|
self.offset += 2
|
|
return x
|
|
def read_u32(self):
|
|
x, = up('<I', self.body[self.offset:self.offset+4])
|
|
self.offset += 4
|
|
return x
|
|
def read_u64(self):
|
|
x, = up('<Q', self.body[self.offset:self.offset+8])
|
|
self.offset += 8
|
|
return x
|
|
def read_struct(self, format, sz):
|
|
x = up(format, self.body[self.offset:self.offset+sz])
|
|
self.offset += sz
|
|
return x
|