the last express subtitles

!the last express subtitles dumper + creator

assumes the ability to run Python from command line

1002.sbe.txt

[00:00.033-00:02.000]
Excuse me. Got a light?
[00:07.500-00:08.000]
Thanks.
[00:08.500-00:11.000]
Haven't we met somewhere before?
[00:11.033-00:20.066]
It's possible. I don't think
I would have remembered.

dumpsbe.py

import io, sys, struct

def raw2str(s):
	s = bytearray(s)
	ret = ""
	for i in range(len(s) // 2):
		assert s[2 * i + 1] == 0, "invalid character"
		ret = ret + bytes([s[2 * i]]).decode('cp437')
	return ret

with io.open(sys.argv[1], 'rb') as f:
	count, = struct.unpack('<H', f.read(2))
	for _ in range(count):
		v1, v2, len1, len2 = struct.unpack('<HHHH', f.read(8))
		s1 = raw2str(f.read(len1 * 2))
		s2 = raw2str(f.read(len2 * 2))
		if s2 != "":
			s2 = "\n" + s2
		print("[%02d:%02d.%03d-%02d:%02d.%03d]\n%s%s" % (v1//(30*60), (v1//30)%60, (v1%30)*1000//30, v2//(30*60), (v2//30)%60, (v2%30)*1000//30, s1, s2))

makesbe.py

import sys, io, struct, re, array
with io.open(sys.argv[1], "rb") as f:
	data = []
	for line in f.readlines():
		line = line.decode('utf-8').strip()
		if len(line) == 0:
			continue
		if line[0] == '[':
			match = re.match(r'^\[(\d+):(\d+)\.(\d+)-(\d+):(\d+)\.(\d+)\]$', line)
			assert match, "Invalid time format"
			beginTime = int(match.group(1)) * 60 * 30 + int(round(float(match.group(2)+'.'+match.group(3)) * 30))
			endTime = int(match.group(4)) * 60 * 30 + int(round(float(match.group(5)+'.'+match.group(6)) * 30))
			assert beginTime < endTime, "Invalid time range in " + sys.argv[1]
			assert len(data) == 0 or len(data[-1][2]) > 0, "Time without data in " + sys.argv[1]
			assert len(data) == 0 or beginTime >= data[-1][1], "Decreasing time in " + sys.argv[1]
			data.append([beginTime, endTime, "", ""])
		else:
			assert len(data) > 0, "Data without time in " + sys.argv[1]
			assert len(line) <= 45, "Too long line in " + sys.argv[1]
			if len(data[-1][2]) == 0:
				data[-1][2] = line
			else:
				assert len(data[-1][3]) == 0, "Too many data lines in " + sys.argv[1]
				data[-1][3] = line
	assert len(data) > 0, "Empty file " + sys.argv[1]
	assert len(data[-1][2]) > 0, "Time without data in " + sys.argv[1]
with open(sys.argv[2], "wb") as out:
	packed = array.array('H')
	packed.append(len(data))
	for item in data:
		packed.append(item[0])
		packed.append(item[1])
		packed.append(len(item[2]))
		packed.append(len(item[3]))
		for c in bytearray(item[2].encode('cp437')):
			packed.append(c)
		for c in bytearray(item[3].encode('cp437')):
			packed.append(c)
	while len(packed) % 0x400:
		packed.append(0)
	packed.tofile(out)