forked from leviathanch/libsmartpen
/
parsestf.py
executable file
·279 lines (237 loc) · 9.05 KB
/
parsestf.py
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#!/usr/bin/env python3
class BitReader(object):
def __init__(self, stream):
self.stream = stream
self.byte = 0
self.nbits = 0
def flush(self):
self.nbits=0
self.byte=0
def sync(self, debug=False):
self.nbits=0
self.byte=0xff
sank_bytes = 0
while self.byte & ~0x98:
self.byte = ord(self.stream.read(1))
sank_bytes += 1
if debug and sank_bytes > 1:
print("resync: ate %d bytes" % (sank_bytes - 1))
self.nbits = 8
def get_bits(self, n=1):
while n > self.nbits:
x = self.stream.read(1)
if x == "":
print(self.nbits)
print("%x" % self.byte)
raise EOFError
x = ord(x)
self.byte = (self.byte << 8) | x
self.nbits += 8
x = self.byte >> (self.nbits - n)
self.byte -= x << (self.nbits - n)
self.nbits -= n
return x
def decode(br, codetab, debug=False):
stream = 0
codeacc = 0
have_bits = 0
for code in codetab:
get_bits = code[0] - have_bits
codeacc <<= get_bits;
codeacc += len(code[1])
stream <<= get_bits;
stream |= br.get_bits(get_bits);
have_bits += get_bits;
if stream < codeacc:
return code[1][stream-codeacc]
raise RuntimeError("unknown code encountered")
class STFParser(object):
def __init__(self, stream):
br = BitReader(stream)
self.br = br
magic = br.get_bits(16)
if magic != 0x0100:
raise RuntimeError("bad magic %x" % magic)
version = stream.read(14)
if version != b"Anoto STF v1.0":
raise RuntimeError("bad version %s" % version)
speed = br.get_bits(16)
self.speed = speed
def get_force(self):
tab_force = [
[1, [0]]
,[6, [1,4,7,9,10,11,13,15,17,20,21,22,23,24,25,26,27,28,30]]
,[7, [2,3,5,6,8,12,14,16,18,19,29,31,32,33,34,35,36,49,52]]
,[8, [37,45,46,47,48,50,51,53,54]]
,[9, [38,39,40,41,44,55,56]]
,[10, [43,57,58]]
,[11, [42,59,60,61,62,63]]
]
return self.br.decode(tab_force)
def get_header2(self):
tab_header2 = [
[1, [0]]
,[2, [1,3]]
]
return self.br.decode(tab_header2)
def get_header(self):
tab_header = [
[1, [0]]
,[2, [1,2]]
]
return self.br.decode(tab_header)
def get_time(self):
tab_time = [
[1, [1]]
,[2, [2]]
,[4, [0,3,4]]
,[6, [5,6]]
,[7, [7,8]]
,[8, [9]]
,[9, [10,11]]
,[10, [12,13,14]]
,[11, [15]]
,[12, [16,17,18,19,21,22]]
,[13, [20,23,24,25,26,27]]
,[14, [28,29,30,31,32,35,36,37,40]]
,[15, [38,39,41,44,45,48,50,53,59,60,67,73,82,91,98,99,102]]
,[16, [33,34,42,43,46,47,49,51,52,54,55,56,57,58,61,62,63,64,65,66,68,69,70,71,72,74,75,76,77,78,79,80,81,83,84,85,86,87,88,89,90,92,93,94,95,96,97,100,101,103,104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,123,124,125,126,127]]
]
return self.br.decode(tab_time)
def get_deltax(self):
tab_dx = [
[4, [3,4,5]]
,[5, [0,1,2,6,7,8,9,-8,-7,-6,-5,-4,-3,-2,-1]]
,[6, [10,11,12,13,-13,-12,-11,-10,-9]]
,[7, [14,15,16,17,18,19,-18,-17,-16,-15,-14]]
,[8, [20,21,22,23,24,26,-25,-24,-23,-22,-21,-20,-19]]
,[9, [25,27,28,29,30,31,32,33,34,36,38,-36,-34,-33,-32,-31,-30,-29,-28,-27,-26]]
,[10, [35,37,39,40,41,42,43,44,45,46,47,49,55,-57,-50,-47,-46,-44,-43,-42,-41,-40,-39,-38,-37,-35]]
]
return self.br.decode(tab_dx)
def get_deltay(self):
tab_dy = [
[5, [0,1,2,3,4,5,6,7,8,-9,-8,-7,-6,-5,-4,-3,-2,-1]]
,[6, [9,10,11,12,13,-14,-13,-12,-11,-10]]
,[7, [14,15,16,17,18,19,20,-20,-19,-18,-17,-16,-15]]
,[8, [21,22,23,24,25,26,27,28,29,30,31,-27,-26,-25,-24,-23,-22,-21]]
,[9, [32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,49,-45,-44,-43,-40,-39,-38,-37,-36,-35,-34,-33,-32,-31,-30,-29,-28]]
,[10, [47,48,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,66,67,68,69,71,72,73,78,85,-75,-69,-64,-62,-61,-60,-59,-58,-57,-56,-55,-54,-53,-52,-51,-50,-49,-48,-47,-46,-42,-41]]
]
return self.br.decode(tab_dy)
def get_header3(self):
tab_header3 = [
[1, [0,1]]
]
return self.br.decode(tab_header3)
def get_deltaforce(self):
tab_dforce = [
[1, [0]]
,[3, [1]]
,[4, [-1]]
,[5, [2,-2]]
,[6, [3,-3]]
,[7, [4,52,53,-4]]
,[8, [5,6,49,50,51,54,55,-17,-16,-15,-14,-13,-12,-7,-6,-5]]
,[9, [7,8,9,10,11,12,13,30,31,36,37,38,39,40,41,46,48,56,57,-56,-55,-54,-53,-52,-51,-50,-49,-40,-38,-21,-20,-19,-18,-11,-10,-9,-8]]
,[10, [14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,32,33,34,35,42,43,44,45,47,58,-57,-48,-47,-46,-45,-44,-43,-42,-41,-39,-37,-36,-35,-34,-33,-32,-31,-29,-28,-27,-26,-25,-24,-23,-22]]
,[11, [-59,-58,-30]]
,[12, [59,-64]]
,[13, [60,61,62,63,-63,-62,-61,-60]]
]
return self.br.decode(tab_dforce)
def parse(self):
start_time = 0
br = self.br
while True:
br.sync()
header = br.get_bits(8)
if header == 0x18:
time = br.get_bits(64)
elif header == 0x10:
time = br.get_bits(32)
elif header == 0x08:
time = br.get_bits(16)
elif header == 0:
time = br.get_bits(8)
elif header == 0x80:
break
else:
print("bad header %x" % header)
continue
try:
start_time += time
x0 = br.get_bits(16)
y0 = br.get_bits(16)
f0 = self.get_force()
self.handle_point(x0, y0, f0, start_time)
xa=0
ya=0
sample_in_stroke = 0
while True:
header = self.get_header()
if header==0 or header==1:
time = self.get_time()
else:
header2 = self.get_header2()
if header2 == 0:
time = br.get_bits(8)
elif header2 == 1:
time = br.get_bits(16)
elif header2 == 2:
time = br.get_bits(32)
else:
print("bad stroke time header %d" % header2)
if time==0:
self.handle_stroke_end(time)
break
sample_in_stroke += time
point_time = start_time + sample_in_stroke * 1000 // self.speed
do_delta = True
if header > 0:
len = br.get_bits()
if len:
do_delta = False
x1 = br.get_bits(16)
y1 = br.get_bits(16)
xa = x1 - x0
ya = y1 - y0
else:
deltax = br.get_bits(8)
deltay = br.get_bits(8)
# sign-extend
if deltax & 0x80: deltax = deltax | -0x100
if deltay & 0x80: deltay = deltay | -0x100
else:
deltax = self.get_deltax()
deltay = self.get_deltay()
deltaf = self.get_deltaforce()
if do_delta:
xa = deltax + (xa * time) // 256
ya = deltay + (ya * time) // 256
x0 += xa
xa *= 256 // time
y0 += ya
ya *= 256 // time
f0 += deltaf
self.handle_point(x0, y0, f0, point_time)
pass
except Exception as e:
print(e)
raise
continue
pass
def handle_stroke_end(self, time):
pass
def handle_point(self, x, y, force, time):
print("Override STFParser and provide your own!")
assert False
if __name__ == "__main__":
import sys
class TestParser(STFParser):
def handle_point(self, x, y, f, time):
print("%d, %d, %d, %d" % (x, y, f, time))
f = open(sys.argv[1], 'rb')
tp = TestParser(f)
print("Speed is %d" % tp.speed)
tp.parse()