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vtds.py
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vtds.py
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# VideoTex Demo Server
#
# by tim lindner
# November 2022
import socket
import random
import time
from PIL import Image
from pathlib import Path
import glob
def sendAll_print(data):
for char in data:
if char < 0x20:
print("out: " + hex(char))
else:
print("out: " + hex(char) + " " + chr(char))
conn.sendall(data)
def calcChecksum(data):
result = 0
tc = 0
for char in data[2:]:
if char != 0x10:
if tc == 1:
char = char - 0x40
tc = 0
result = result * 2
if result > 255:
result = result - 256
result = result + 1
result = result + char
if result > 255:
result = result - 256
result = result + 1
else:
tc = 1
if result < 0x40:
return bytes(chr(0x10)+chr(result+0x40), 'latin_1')
else:
return bytes(chr(result), 'latin_1')
HOST = "127.0.0.1" # Standard loopback interface address (localhost)
PORT = 65432 # Port to listen on (non-privileged ports are > 1023)
print ("Opening listening socket on address:",{HOST},"and port:",{PORT})
with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
s.bind((HOST, PORT))
s.listen()
conn, addr = s.accept()
mode = 0
next_mode = 0
input = b''
interrogate = b''
global_block_number = b'1'
with conn:
print(f"Connected by {addr}")
while True:
# Wait for initial keyboard input
if mode==0:
data = conn.recv(1024)
if not data:
break
if data == b'\r':
# send interrogate sequence
conn.sendall(b"\x1b\x49")
# receive data with no echo
next_mode = 7
mode = 6;
# Display main menu
if mode==1:
if interrogate != "":
conn.sendall(b"\r\nTerminal code: ")
conn.sendall(interrogate)
conn.sendall(b"\r\nHere is the main menu:")
conn.sendall(b"\r\n1. Print Lorem Ipsum")
conn.sendall(b"\r\n2. Display semi graphics")
conn.sendall(b"\r\n3. Display med res graphics")
conn.sendall(b"\r\n4. Load stored text")
conn.sendall(b"\r\n5. Load and run executable")
conn.sendall(b"\r\n6. Log out")
conn.sendall(b"\r\nChoose: ")
input = b""
next_mode = 3
#Change sursor to red
#conn.sendall(b"\x1b\x60\xaf")
mode = 2
# accept input end with \r then goto next_mode
if mode==2:
data = conn.recv(1024)
if not data:
break
for char in data:
if char < 0x20:
print("in: " + hex(char))
else:
print("in: " + hex(char) + " " + chr(char))
if data == b'\x11':
# eat this byte
pass
elif data == b'\r':
mode = next_mode
conn.sendall(b"\r\n")
# change cursor back to blue
#conn.sendall(b"\x1b\x60\xbf")
elif data == b'\b':
input = input[:-1]
if len(input)>0:
conn.sendall(b"\b")
else:
input = input + data;
conn.sendall(data)
# handle main menu selection
if mode==3:
if input == b"1":
mode = 4
elif input == b"2":
mode = 8
elif input == b"3":
mode = 10
elif input == b"4":
mode = 12
elif input == b"5":
mode = 16
elif input == b"6":
break;
else:
mode = 1
# ask how manu word to print of lorem ipsum
if mode == 4:
conn.sendall(b"\r\nHow many words? ")
input = b""
next_mode = 5
mode = 2
if mode == 5:
fd = Path('lorem.txt').read_text()
count = int(input)
for element in fd:
if element == " ":
count = count - 1
if count == 0:
break;
conn.sendall(bytes(element,'utf-8'))
conn.sendall(b"\r\nPress <enter> to continue")
next_mode = 1
mode = 2
# accept input end with \r (no echo) then goto next_mode
if mode == 6:
data = conn.recv(1024)
if not data:
break
for char in data:
if char < 0x20:
print("in: " + hex(char))
else:
print("in: " + hex(char) + " " + chr(char))
if data == b'\x11':
pass
elif data == b'\r':
mode = next_mode
elif data == b'\b':
input = input[:-1]
else:
input = input + data;
# save interrogate
if mode == 7:
interrogate = input
mode = 1
# ask how many colored squared to print
if mode == 8:
conn.sendall(b"\r\nDraw how many squares? ")
input = b""
next_mode = 9
mode = 2
# draw semi graphics squares in random positions
if mode == 9:
# clear screen
conn.sendall(b"\x1b\x6a")
# put in semi graphics mode
conn.sendall(b"\x1b\x47\x34")
for i in range(int(input)):
conn.sendall(b"\x1b\x59")
x = 0x20 + random.randrange(31)
y = 0x20 + random.randrange(14)
c = 128 + random.randrange(127)
conn.sendall(bytes(chr(y),'latin_1'))
conn.sendall(bytes(chr(x),'latin_1'))
conn.sendall(bytes(chr(c),'latin_1'))
# put in alpha only mode
conn.sendall(b"\x1b\x47\x4e")
# position cursor at bottom of screen
conn.sendall(b"\x1b\x59")
x = 0x20
y = 0x20 + 15
conn.sendall(bytes(chr(y),'latin_1'))
conn.sendall(bytes(chr(x),'latin_1'))
conn.sendall(b"Press <enter> to continue")
mode = 2
input = b""
next_mode = 1
# describe graphics mode
if mode == 10:
# get list of files
imageFiles = []
for file in glob.glob("*.jpg"):
imageFiles.append(file)
conn.sendall(b"\r\nList of avaiable files:")
i = 1
for file in imageFiles:
conn.sendall(b"\r\n")
conn.sendall(bytes(str(i)+" ",'latin_1'))
conn.sendall(bytes(file,'latin_1'))
i = i + 1
conn.sendall(b"\r\nChoose file by number: ")
mode = 2
input = b""
next_mode = 11
# draw medium graphics
if mode == 11:
# get list of files
imageFiles = []
for file in glob.glob("*.jpg"):
imageFiles.append(file)
try:
imageNumber = int(input) - 1
except ValueError:
conn.sendall(b"\r\nError.\r\nPress <enter> to continue")
mode = 2
input = b""
next_mode = 1
pass
if imageNumber < len(imageFiles):
# put in medium graphics mode
conn.sendall(b"\x1b\x47\x4d")
im = Image.open(imageFiles[imageNumber])
im = im.resize((128,96), 0)
im = im.convert('1')
h = 0
v = 0
black = 0
white = 0
while v < 96:
while h < 128:
# count contiguous black pixels
while h < 128:
a = im.getpixel((h,v))
if a < 128:
black = black + 1
else:
break;
h = h + 1
# count contiguous white pixels
while h < 128:
a = im.getpixel((h,v))
if a >= 128:
white = white + 1
else:
break;
h = h + 1
conn.sendall(bytes(chr(0x20+black),'latin_1'))
conn.sendall(bytes(chr(0x20+white),'latin_1'))
black = 0
white = 0
v = v + 1
h = 0
conn.sendall(b"\x1b\x47\x4e")
conn.sendall(b"\r\nPress <enter> to continue")
mode = 6
input = b""
next_mode = 1
else:
conn.sendall(b"\r\nFile not found")
conn.sendall(b"\r\nPress <enter> to continue")
mode = 2
input = b""
next_mode = 1
# ask which page to retrieve
if mode == 12:
conn.sendall(b"\r\nWhich page to retrieve? ")
input = b""
next_mode = 13
mode = 2
# send B Protocol to ask for page
if mode == 13:
# request page
bProtocol = b"\x10B" + global_block_number + b"RP" + input + b"\x03";
checksum = calcChecksum(bProtocol)
sendAll_print(bProtocol)
sendAll_print(checksum)
next_mode = 15
mode = 14
# wait for ACK
if mode == 14:
data = conn.recv(1024)
if not data:
break
if data != b'\x10':
print("Error: Acknowledge not recieved\n")
conn.sendall(b"\r\nError: Acknowledge not recieved")
mode = 1
continue
data = conn.recv(1024)
if not data:
break
if data != global_block_number:
print("Error: Wrong block received.\n")
conn.sendall(b"\r\nError: Wrong block received.")
mode = 1
continue
global_block_number = int(global_block_number)
global_block_number = global_block_number + 1
if global_block_number > 9:
global_block_number = 0;
global_block_number = bytes(str(global_block_number), 'latin_1')
mode = next_mode
input = b''
continue
# Recieve data
if mode == 15:
# get block until <EXT>
while True:
data = conn.recv(1024)
if not data:
break
for char in data:
if char < 0x20:
print("in: " + hex(char))
else:
print("in: " + hex(char) + " " + chr(char))
if data == b'\x03': # ASCII <EXT>
input = input + data
break
input = input + data
# get checksum byte
data = conn.recv(1024)
if not data:
break
for char in data:
if char < 0x20:
print("in: " + hex(char))
else:
print("in: " + hex(char) + " " + chr(char))
checksum = calcChecksum(input)
print("Calculated checksum: " + hex(checksum[0]))
if checksum != data:
conn.sendall(b"\r\nError: checksum incorrect")
mode = 1
continue
f = open("block_read.txt","wb")
f.write(input)
f.close()
# send ASCII ACK
conn.sendall(b"\x10"+global_block_number)
conn.sendall(b"\r\nData recieved. Length: " + bytes(str(len(input)), 'latin_1'))
mode = 1
continue
# prepare to send binary to computer
if mode == 16:
conn.sendall(b"\r\nThis will send a machine language program to you device.")
conn.sendall(b"\r\nIt takes about 30 seconds.")
conn.sendall(b"\r\nPress <enter> to begin.")
mode = 2
next_mode = 17
continue
# Send binary program to terminal
if mode == 17:
# create block header to send binary starting at $E00
bProtocol = b"\x10B" + global_block_number + b"B\x10\x40\x10\x4e"
with open('keyscn2.bin', mode='rb') as file:
fileContent = file.read()
# add object code to block (follow transparency rule)
for byte in fileContent:
if byte < 0x40:
bProtocol = bProtocol + bytes(chr(0x10),'latin_1')
bProtocol = bProtocol + bytes(chr(byte+0x40),'latin_1')
else:
bProtocol = bProtocol + bytes(chr(byte),'latin_1')
# end block with <ETX>
bProtocol = bProtocol + b'\x03'
checksum = calcChecksum(bProtocol)
sendAll_print(bProtocol)
sendAll_print(checksum)
# wait for ACK
mode = 14
next_mode = 18
continue
# Tell VideoTex to display page 1
if mode == 18:
# create block header
bProtocol = b"\x10B" + global_block_number + b"D1\x03"
checksum = calcChecksum(bProtocol)
# send it
sendAll_print(bProtocol)
sendAll_print(checksum)
# wait for ACK
mode = 14
next_mode = 19
continue
# Tell video text to display page 2
if mode == 19:
# create block header
bProtocol = b"\x10B" + global_block_number + b"D2\x03"
checksum = calcChecksum(bProtocol)
# send it
sendAll_print(bProtocol)
sendAll_print(checksum)
# wait for ACK
mode = 14
next_mode = 20
continue
# execute program at $E00
if mode == 20:
# create block header
bProtocol = b"\x10B" + global_block_number + b"G\x10\x40\x10\x4e\x03"
checksum = calcChecksum(bProtocol)
# send it
sendAll_print(bProtocol)
sendAll_print(checksum)
# end server
mode = 0
continue;