def get_tag_map(control_byte_count, tagx, data, strict=False):
ptags = []
ans = {}
control_bytes = list(bytearray(data[:control_byte_count]))
data = data[control_byte_count:]
for x in tagx:
if x.eof == 0x01:
control_bytes = control_bytes[1:]
continue
value = control_bytes[0] & x.bitmask
if value != 0:
value_count = value_bytes = None
if value == x.bitmask:
if count_set_bits(x.bitmask) > 1:
# If all bits of masked value are set and the mask has more
# than one bit, a variable width value will follow after
# the control bytes which defines the length of bytes (NOT
# the value count!) which will contain the corresponding
# variable width values.
value_bytes, consumed = decint(data)
data = data[consumed:]
else:
value_count = 1
else:
# Shift bits to get the masked value.
mask = x.bitmask
while mask & 0b1 == 0:
mask >>= 1
value >>= 1
value_count = value
ptags.append(
PTagX(x.tag, value_count, value_bytes, x.num_of_values))
for x in ptags:
values = []
if x.value_count is not None:
# Read value_count * values_per_entry variable width values.
for _ in xrange(x.value_count * x.num_of_values):
byts, consumed = decint(data)
data = data[consumed:]
values.append(byts)
else: # value_bytes is not None
# Convert value_bytes to variable width values.
total_consumed = 0
while total_consumed < x.value_bytes:
# Does this work for values_per_entry != 1?
byts, consumed = decint(data)
data = data[consumed:]
total_consumed += consumed
values.append(byts)
if total_consumed != x.value_bytes:
err = ("Error: Should consume %s bytes, but consumed %s" %
(x.value_bytes, total_consumed))
if strict:
raise ValueError(err)
else:
print(err)
ans[x.tag] = values
# Test that all bytes have been processed
if data.replace(b'\0', b''):
err = ("Warning: There are unprocessed index bytes left: %s" %
format_bytes(data))
if strict:
raise ValueError(err)
else:
print(err)
return ans
def get_tag_map(control_byte_count, tagx, data, strict=False):
ptags = []
ans = {}
control_bytes = list(bytearray(data[:control_byte_count]))
data = data[control_byte_count:]
for x in tagx:
if x.eof == 0x01:
control_bytes = control_bytes[1:]
continue
value = control_bytes[0] & x.bitmask
if value != 0:
value_count = value_bytes = None
if value == x.bitmask:
if count_set_bits(x.bitmask) > 1:
# If all bits of masked value are set and the mask has more
# than one bit, a variable width value will follow after
# the control bytes which defines the length of bytes (NOT
# the value count!) which will contain the corresponding
# variable width values.
value_bytes, consumed = decint(data)
data = data[consumed:]
else:
value_count = 1
else:
# Shift bits to get the masked value.
mask = x.bitmask
while mask & 0b1 == 0:
mask >>= 1
value >>= 1
value_count = value
ptags.append(PTagX(x.tag, value_count, value_bytes,
x.num_of_values))
for x in ptags:
values = []
if x.value_count is not None:
# Read value_count * values_per_entry variable width values.
for _ in xrange(x.value_count * x.num_of_values):
byts, consumed = decint(data)
data = data[consumed:]
values.append(byts)
else: # value_bytes is not None
# Convert value_bytes to variable width values.
total_consumed = 0
while total_consumed < x.value_bytes:
# Does this work for values_per_entry != 1?
byts, consumed = decint(data)
data = data[consumed:]
total_consumed += consumed
values.append(byts)
if total_consumed != x.value_bytes:
err = ("Error: Should consume %s bytes, but consumed %s" %
(x.value_bytes, total_consumed))
if strict:
raise ValueError(err)
else:
print(err)
ans[x.tag] = values
# Test that all bytes have been processed
if data.replace(b'\0', b''):
err = ("Warning: There are unprocessed index bytes left: %s" %
format_bytes(data))
if strict:
raise ValueError(err)
else:
print(err)
return ans
