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import time
from fcntl import ioctl
from array import array
from struct import unpack_from
from struct import unpack
from struct import pack
import errno
import sys
charmap = {}
hichar = None
def updateCharMap(screen):
global hichar
ttyno = '4'
tty = open('/dev/tty' + screen, 'rb')
GIO_UNIMAP = 0x4B66
VT_GETHIFONTMASK = 0x560D
himask = array("H", (0,))
ioctl(tty, VT_GETHIFONTMASK, himask)
hichar, = unpack_from("@H", himask)
sz = 512
line = ''
while True:
try:
unipairs = array("H", [0]*(2*sz))
unimapdesc = array("B", pack("@HP", sz, unipairs.buffer_info()[0]))
ioctl(tty.fileno(), GIO_UNIMAP, unimapdesc)
break
except IOError as e:
if e.errno != errno.ENOMEM:
raise
sz *= 2
tty.close()
ncodes, = unpack_from("@H", unimapdesc)
utable = unpack_from("@%dH" % (2*ncodes), unipairs)
for u, b in zip(utable[::2], utable[1::2]):
if charmap.get(b) is None:
charmap[b] = chr(u)
def autoDecodeVCSA(allData, rows, cols):
allText = []
allAttrib = []
for y in range(rows):
lineText = ''
lineAttrib = []
i = 0
for x in range(cols):
data = allData[i: i + 2]
i += 2
if data == b' \x07':
#attr = 7
#ink = 7
#paper = 0
#ch = ' '
lineAttrib.append(7)
lineText += ' '
continue
(sh,) = unpack("=H", data)
attr = (sh >> 8) & 0xFF
ch = sh & 0xFF
if hichar == 0x100:
attr >>= 1
lineAttrib.append(attr)
ink = attr & 0x0F
paper = (attr>>4) & 0x0F
#if (ink != 7) or (paper != 0):
# print(ink,paper)
if sh & hichar:
ch |= 0x100
try:
lineText += charmap[ch]
except:
lineText += chr('?')
allText.append(lineText)
allAttrib.append(lineAttrib)
return allText, allAttrib
def m(screen):
s = time.time()
updateCharMap(str(screen))
print(time.time() -s )
vcsa = open('/dev/vcsa' + str(screen), 'rb')
head = vcsa.read(4)
rows = int(head[0])
cols = int(head[1])
text, attrib = autoDecodeVCSA(vcsa.read(), rows, cols)
print(time.time() -s )
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