def build_tzinfo(zone, fp):
head_fmt = '>4s c 15x 6l'
head_size = calcsize(head_fmt)
(magic, format, ttisgmtcnt, ttisstdcnt, leapcnt, timecnt, typecnt,
charcnt) = unpack(head_fmt, fp.read(head_size))
# Make sure it is a tzfile(5) file
assert magic == _byte_string('TZif'), 'Got magic %s' % repr(magic)
# Read out the transition times, localtime indices and ttinfo structures.
data_fmt = '>%(timecnt)dl %(timecnt)dB %(ttinfo)s %(charcnt)ds' % dict(
timecnt=timecnt, ttinfo='lBB' * typecnt, charcnt=charcnt)
data_size = calcsize(data_fmt)
data = unpack(data_fmt, fp.read(data_size))
# make sure we unpacked the right number of values
assert len(data) == 2 * timecnt + 3 * typecnt + 1
transitions = [memorized_datetime(trans) for trans in data[:timecnt]]
lindexes = list(data[timecnt:2 * timecnt])
ttinfo_raw = data[2 * timecnt:-1]
tznames_raw = data[-1]
del data
# Process ttinfo into separate structs
ttinfo = []
tznames = {}
i = 0
while i < len(ttinfo_raw):
# have we looked up this timezone name yet?
tzname_offset = ttinfo_raw[i + 2]
if tzname_offset not in tznames:
nul = tznames_raw.find(_NULL, tzname_offset)
if nul < 0:
nul = len(tznames_raw)
tznames[tzname_offset] = _std_string(
tznames_raw[tzname_offset:nul])
ttinfo.append(
(ttinfo_raw[i], bool(ttinfo_raw[i + 1]), tznames[tzname_offset]))
i += 3
# Now build the timezone object
if len(ttinfo) == 1 or len(transitions) == 0:
ttinfo[0][0], ttinfo[0][2]
cls = type(
zone, (StaticTzInfo, ),
dict(zone=zone,
_utcoffset=memorized_timedelta(ttinfo[0][0]),
_tzname=ttinfo[0][2]))
else:
# Early dates use the first standard time ttinfo
i = 0
while ttinfo[i][1]:
i += 1
if ttinfo[i] == ttinfo[lindexes[0]]:
transitions[0] = datetime.min
else:
transitions.insert(0, datetime.min)
lindexes.insert(0, i)
# calculate transition info
transition_info = []
for i in range(len(transitions)):
inf = ttinfo[lindexes[i]]
utcoffset = inf[0]
if not inf[1]:
dst = 0
else:
for j in range(i - 1, -1, -1):
prev_inf = ttinfo[lindexes[j]]
if not prev_inf[1]:
break
dst = inf[0] - prev_inf[0] # dst offset
# Bad dst? Look further. DST > 24 hours happens when
# a timzone has moved across the international dateline.
if dst <= 0 or dst > 3600 * 3:
for j in range(i + 1, len(transitions)):
stdinf = ttinfo[lindexes[j]]
if not stdinf[1]:
dst = inf[0] - stdinf[0]
if dst > 0:
break # Found a useful std time.
tzname = inf[2]
# Round utcoffset and dst to the nearest minute or the
# datetime library will complain. Conversions to these timezones
# might be up to plus or minus 30 seconds out, but it is
# the best we can do.
utcoffset = int((utcoffset + 30) // 60) * 60
dst = int((dst + 30) // 60) * 60
transition_info.append(memorized_ttinfo(utcoffset, dst, tzname))
cls = type(
zone, (DstTzInfo, ),
dict(zone=zone,
_utc_transition_times=transitions,
_transition_info=transition_info))
return cls()
def build_tzinfo(zone, fp):
head_fmt = '>4s 16x 6l'
head_size = calcsize(head_fmt)
(magic,ttisgmtcnt,ttisstdcnt,leapcnt,
timecnt,typecnt,charcnt) = unpack(head_fmt, fp.read(head_size))
# Make sure it is a tzinfo(5) file
assert magic == 'TZif'
# Read out the transition times, localtime indices and ttinfo structures.
data_fmt = '>%(timecnt)dl %(timecnt)dB %(ttinfo)s %(charcnt)ds' % {
'timecnt': timecnt, 'ttinfo': 'lBB'*typecnt, 'charcnt': charcnt}
data_size = calcsize(data_fmt)
data = unpack(data_fmt, fp.read(data_size))
# make sure we unpacked the right number of values
assert len(data) == 2 * timecnt + 3 * typecnt + 1
transitions = [memorized_datetime(trans)
for trans in data[:timecnt]]
lindexes = list(data[timecnt:2 * timecnt])
ttinfo_raw = data[2 * timecnt:-1]
tznames_raw = data[-1]
del data
# Process ttinfo into separate structs
ttinfo = []
tznames = {}
i = 0
while i < len(ttinfo_raw):
# have we looked up this timezone name yet?
tzname_offset = ttinfo_raw[i+2]
if tzname_offset not in tznames:
nul = tznames_raw.find('\0', tzname_offset)
if nul < 0:
nul = len(tznames_raw)
tznames[tzname_offset] = tznames_raw[tzname_offset:nul]
ttinfo.append((ttinfo_raw[i],
bool(ttinfo_raw[i+1]),
tznames[tzname_offset]))
i += 3
# Now build the timezone object
if len(transitions) == 0:
ttinfo[0][0], ttinfo[0][2]
cls = type(zone, (StaticTzInfo,), {
'zone': zone,
'_utcoffset': memorized_timedelta(ttinfo[0][0]),
'_tzname': ttinfo[0][2]})
else:
# Early dates use the first standard time ttinfo
i = 0
while ttinfo[i][1]:
i += 1
if ttinfo[i] == ttinfo[lindexes[0]]:
transitions[0] = datetime.min
else:
transitions.insert(0, datetime.min)
lindexes.insert(0, i)
# calculate transition info
transition_info = []
for i in range(len(transitions)):
inf = ttinfo[lindexes[i]]
utcoffset = inf[0]
if not inf[1]:
dst = 0
else:
for j in range(i-1, -1, -1):
prev_inf = ttinfo[lindexes[j]]
if not prev_inf[1]:
break
dst = inf[0] - prev_inf[0] # dst offset
tzname = inf[2]
# Round utcoffset and dst to the nearest minute or the
# datetime library will complain. Conversions to these timezones
# might be up to plus or minus 30 seconds out, but it is
# the best we can do.
utcoffset = int((utcoffset + 30) / 60) * 60
dst = int((dst + 30) / 60) * 60
transition_info.append(memorized_ttinfo(utcoffset, dst, tzname))
cls = type(zone, (DstTzInfo,), {
'zone': zone,
'_utc_transition_times': transitions,
'_transition_info': transition_info})
return cls()
def build_tzinfo(zone, fp):
head_fmt = ">4s 16x 6l"
head_size = calcsize(head_fmt)
(magic, ttisgmtcnt, ttisstdcnt, leapcnt, timecnt, typecnt, charcnt) = unpack(head_fmt, fp.read(head_size))
assert magic == "TZif"
data_fmt = ">%(timecnt)dl %(timecnt)dB %(ttinfo)s %(charcnt)ds" % dict(
timecnt=timecnt, ttinfo="lBB" * typecnt, charcnt=charcnt
)
data_size = calcsize(data_fmt)
data = unpack(data_fmt, fp.read(data_size))
assert len(data) == 2 * timecnt + 3 * typecnt + 1
transitions = [memorized_datetime(trans) for trans in data[:timecnt]]
lindexes = list(data[timecnt : 2 * timecnt])
ttinfo_raw = data[2 * timecnt : -1]
tznames_raw = data[-1]
del data
ttinfo = []
tznames = {}
i = 0
while i < len(ttinfo_raw):
tzname_offset = ttinfo_raw[i + 2]
if tzname_offset not in tznames:
nul = tznames_raw.find("\0", tzname_offset)
if nul < 0:
nul = len(tznames_raw)
tznames[tzname_offset] = tznames_raw[tzname_offset:nul]
ttinfo.append((ttinfo_raw[i], bool(ttinfo_raw[i + 1]), tznames[tzname_offset]))
i += 3
if len(transitions) == 0:
ttinfo[0][0], ttinfo[0][2]
cls = type(
zone, (StaticTzInfo,), dict(zone=zone, _utcoffset=memorized_timedelta(ttinfo[0][0]), _tzname=ttinfo[0][2])
)
else:
i = 0
while ttinfo[i][1]:
i += 1
if ttinfo[i] == ttinfo[lindexes[0]]:
transitions[0] = datetime.min
else:
transitions.insert(0, datetime.min)
lindexes.insert(0, i)
transition_info = []
for i in range(len(transitions)):
inf = ttinfo[lindexes[i]]
utcoffset = inf[0]
if not inf[1]:
dst = 0
else:
for j in range(i - 1, -1, -1):
prev_inf = ttinfo[lindexes[j]]
if not prev_inf[1]:
break
dst = inf[0] - prev_inf[0] # dst offset
tzname = inf[2]
utcoffset = int((utcoffset + 30) / 60) * 60
dst = int((dst + 30) / 60) * 60
transition_info.append(memorized_ttinfo(utcoffset, dst, tzname))
cls = type(
zone, (DstTzInfo,), dict(zone=zone, _utc_transition_times=transitions, _transition_info=transition_info)
)
return cls()
def build_tzinfo(zone, fp):
head_fmt = '>4s 16x 6l'
head_size = calcsize(head_fmt)
(magic, ttisgmtcnt, ttisstdcnt, leapcnt, timecnt, typecnt,
charcnt) = unpack(head_fmt, fp.read(head_size))
# Make sure it is a tzinfo(5) file
assert magic == 'TZif'
# Read out the transition times, localtime indices and ttinfo structures.
data_fmt = '>%(timecnt)dl %(timecnt)dB %(ttinfo)s %(charcnt)ds' % {
'timecnt': timecnt,
'ttinfo': 'lBB' * typecnt,
'charcnt': charcnt
}
data_size = calcsize(data_fmt)
data = unpack(data_fmt, fp.read(data_size))
# make sure we unpacked the right number of values
assert len(data) == 2 * timecnt + 3 * typecnt + 1
transitions = [memorized_datetime(trans) for trans in data[:timecnt]]
lindexes = list(data[timecnt:2 * timecnt])
ttinfo_raw = data[2 * timecnt:-1]
tznames_raw = data[-1]
del data
# Process ttinfo into separate structs
ttinfo = []
tznames = {}
i = 0
while i < len(ttinfo_raw):
# have we looked up this timezone name yet?
tzname_offset = ttinfo_raw[i + 2]
if tzname_offset not in tznames:
nul = tznames_raw.find('\0', tzname_offset)
if nul < 0:
nul = len(tznames_raw)
tznames[tzname_offset] = tznames_raw[tzname_offset:nul]
ttinfo.append(
(ttinfo_raw[i], bool(ttinfo_raw[i + 1]), tznames[tzname_offset]))
i += 3
# Now build the timezone object
if len(transitions) == 0:
ttinfo[0][0], ttinfo[0][2]
cls = type(
zone, (StaticTzInfo, ), {
'zone': zone,
'_utcoffset': memorized_timedelta(ttinfo[0][0]),
'_tzname': ttinfo[0][2]
})
else:
# Early dates use the first standard time ttinfo
i = 0
while ttinfo[i][1]:
i += 1
if ttinfo[i] == ttinfo[lindexes[0]]:
transitions[0] = datetime.min
else:
transitions.insert(0, datetime.min)
lindexes.insert(0, i)
# calculate transition info
transition_info = []
for i in range(len(transitions)):
inf = ttinfo[lindexes[i]]
utcoffset = inf[0]
if not inf[1]:
dst = 0
else:
for j in range(i - 1, -1, -1):
prev_inf = ttinfo[lindexes[j]]
if not prev_inf[1]:
break
dst = inf[0] - prev_inf[0] # dst offset
tzname = inf[2]
# Round utcoffset and dst to the nearest minute or the
# datetime library will complain. Conversions to these timezones
# might be up to plus or minus 30 seconds out, but it is
# the best we can do.
utcoffset = int((utcoffset + 30) / 60) * 60
dst = int((dst + 30) / 60) * 60
transition_info.append(memorized_ttinfo(utcoffset, dst, tzname))
cls = type(
zone, (DstTzInfo, ), {
'zone': zone,
'_utc_transition_times': transitions,
'_transition_info': transition_info
})
return cls()
def build_tzinfo(zone, fp):
head_fmt = '>4s c 15x 6l'
head_size = calcsize(head_fmt)
(magic, format, ttisgmtcnt, ttisstdcnt,leapcnt, timecnt,
typecnt, charcnt) = unpack(head_fmt, fp.read(head_size))
# Make sure it is a tzfile(5) file
assert magic == _byte_string('TZif'), 'Got magic %s' % repr(magic)
# Read out the transition times, localtime indices and ttinfo structures.
data_fmt = '>%(timecnt)dl %(timecnt)dB %(ttinfo)s %(charcnt)ds' % dict(
timecnt=timecnt, ttinfo='lBB'*typecnt, charcnt=charcnt)
data_size = calcsize(data_fmt)
data = unpack(data_fmt, fp.read(data_size))
# make sure we unpacked the right number of values
assert len(data) == 2 * timecnt + 3 * typecnt + 1
transitions = [memorized_datetime(trans)
for trans in data[:timecnt]]
lindexes = list(data[timecnt:2 * timecnt])
ttinfo_raw = data[2 * timecnt:-1]
tznames_raw = data[-1]
del data
# Process ttinfo into separate structs
ttinfo = []
tznames = {}
i = 0
while i < len(ttinfo_raw):
# have we looked up this timezone name yet?
tzname_offset = ttinfo_raw[i+2]
if tzname_offset not in tznames:
nul = tznames_raw.find(_NULL, tzname_offset)
if nul < 0:
nul = len(tznames_raw)
tznames[tzname_offset] = _std_string(
tznames_raw[tzname_offset:nul])
ttinfo.append((ttinfo_raw[i],
bool(ttinfo_raw[i+1]),
tznames[tzname_offset]))
i += 3
# Now build the timezone object
if len(transitions) == 0:
ttinfo[0][0], ttinfo[0][2]
cls = type(zone, (StaticTzInfo,), dict(
zone=zone,
_utcoffset=memorized_timedelta(ttinfo[0][0]),
_tzname=ttinfo[0][2]))
else:
# Early dates use the first standard time ttinfo
i = 0
while ttinfo[i][1]:
i += 1
if ttinfo[i] == ttinfo[lindexes[0]]:
transitions[0] = datetime.min
else:
transitions.insert(0, datetime.min)
lindexes.insert(0, i)
# calculate transition info
transition_info = []
for i in range(len(transitions)):
inf = ttinfo[lindexes[i]]
utcoffset = inf[0]
if not inf[1]:
dst = 0
else:
for j in range(i-1, -1, -1):
prev_inf = ttinfo[lindexes[j]]
if not prev_inf[1]:
break
dst = inf[0] - prev_inf[0] # dst offset
# Bad dst? Look further. DST > 24 hours happens when
# a timzone has moved across the international dateline.
if dst <= 0 or dst > 3600*3:
for j in range(i+1, len(transitions)):
stdinf = ttinfo[lindexes[j]]
if not stdinf[1]:
dst = inf[0] - stdinf[0]
if dst > 0:
break # Found a useful std time.
tzname = inf[2]
# Round utcoffset and dst to the nearest minute or the
# datetime library will complain. Conversions to these timezones
# might be up to plus or minus 30 seconds out, but it is
# the best we can do.
utcoffset = int((utcoffset + 30) // 60) * 60
dst = int((dst + 30) // 60) * 60
transition_info.append(memorized_ttinfo(utcoffset, dst, tzname))
cls = type(zone, (DstTzInfo,), dict(
zone=zone,
_utc_transition_times=transitions,
_transition_info=transition_info))
return cls()
def build_tzinfo(zone, fp):
head_fmt = '>4s c 15x 6l'
head_size = calcsize(head_fmt)
magic, format, ttisgmtcnt, ttisstdcnt, leapcnt, timecnt, typecnt, charcnt = unpack(head_fmt, fp.read(head_size))
assert magic == _byte_string('TZif'), 'Got magic %s' % repr(magic)
data_fmt = '>%(timecnt)dl %(timecnt)dB %(ttinfo)s %(charcnt)ds' % dict(timecnt=timecnt, ttinfo='lBB' * typecnt, charcnt=charcnt)
data_size = calcsize(data_fmt)
data = unpack(data_fmt, fp.read(data_size))
assert len(data) == 2 * timecnt + 3 * typecnt + 1
transitions = [ memorized_datetime(trans) for trans in data[:timecnt] ]
lindexes = list(data[timecnt:2 * timecnt])
ttinfo_raw = data[2 * timecnt:-1]
tznames_raw = data[-1]
del data
ttinfo = []
tznames = {}
i = 0
while i < len(ttinfo_raw):
tzname_offset = ttinfo_raw[i + 2]
if tzname_offset not in tznames:
nul = tznames_raw.find(_NULL, tzname_offset)
if nul < 0:
nul = len(tznames_raw)
tznames[tzname_offset] = _std_string(tznames_raw[tzname_offset:nul])
ttinfo.append((ttinfo_raw[i], bool(ttinfo_raw[i + 1]), tznames[tzname_offset]))
i += 3
if len(transitions) == 0:
(ttinfo[0][0], ttinfo[0][2])
cls = type(zone, (StaticTzInfo,), dict(zone=zone, _utcoffset=memorized_timedelta(ttinfo[0][0]), _tzname=ttinfo[0][2]))
else:
i = 0
while ttinfo[i][1]:
i += 1
if ttinfo[i] == ttinfo[lindexes[0]]:
transitions[0] = datetime.min
else:
transitions.insert(0, datetime.min)
lindexes.insert(0, i)
transition_info = []
for i in range(len(transitions)):
inf = ttinfo[lindexes[i]]
utcoffset = inf[0]
if not inf[1]:
dst = 0
else:
for j in range(i - 1, -1, -1):
prev_inf = ttinfo[lindexes[j]]
if not prev_inf[1]:
break
dst = inf[0] - prev_inf[0]
if dst <= 0 or dst > 10800:
for j in range(i + 1, len(transitions)):
stdinf = ttinfo[lindexes[j]]
if not stdinf[1]:
dst = inf[0] - stdinf[0]
if dst > 0:
break
tzname = inf[2]
utcoffset = int((utcoffset + 30) // 60) * 60
dst = int((dst + 30) // 60) * 60
transition_info.append(memorized_ttinfo(utcoffset, dst, tzname))
cls = type(zone, (DstTzInfo,), dict(zone=zone, _utc_transition_times=transitions, _transition_info=transition_info))
return cls()
