bug fix

[RayCh001]

tftp.py have 2 bug at line 218 & 223 .
"self.block = block + 1" should be "self.block = block + self.wrap * 65536 + 1"
since block is set by block no from ack message, block will rotate from 1 to 65536(0), then self.block rotate from 1 to 65536(0) too,
finally ,
"self.fh.seek(self.blksize * (self.block - 1))" would not get right position for file its size > 2**16*512(65536)

[icb-]

tftp.py have 2 bug at line 218 & 223 .
"self.block = block + 1" should be "self.block = block + self.wrap * 65536 + 1"
since block is set by block no from ack message, block will rotate from 1 to 65536(0), then self.block rotate from 1 to 65536(0) too,

Can you submit a PR with a fix?

finally ,
"self.fh.seek(self.blksize * (self.block - 1))" would not get right position for file its size > 2**16*512(65536)

While this may be true, TFTP is unsuitable for a 2 terabyte file.