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class EixError (Exception):
message = "Unknown error."
def __str__ (self):
return self.message
class EndOfFileException (EixError):
def __init__ (self, filename):
self.message = "End of file reached though it was not expected: '%s'" % filename
class EixReaderClosed (EixError):
message = "EixReader is already closed."
class UnsupportedVersionError (EixError):
def __init__ (self, version):
self.message = "Version '%s' is not supported." % version
cdef class EixReader (object):
cdef object file
cdef char closed
cdef readonly object filename
cdef readonly object version
supported_versions = (28, )
def __init__ (self, filename):
self.filename = filename
self.file = open(filename, "r")
self.closed = 0
self.version = self._get_number()
if self.version not in self.supported_versions:
raise UnsupportedVersionError(self.version)
cdef unsigned long _get_number (self) except *:
cdef unsigned char n
cdef short count, i
cdef unsigned long value
cdef char* rest
cdef object orest
n = self._get_one_byte()
if n < 0xFF:
value = n
else:
count = 0
while (n == 0xFF):
count += 1
n = self._get_one_byte()
if n == 0:
n = 0xFF # 0xFF is encoded as 0xFF 0x00
count -= 1
value = n << (count*8)
if count > 0:
orest = self.get_string(count)
rest = orest # cast to char*
for 0 <= i < count:
value += (<unsigned char>rest[i]) << ((count - i - 1)*8)
return value
cdef unsigned char _get_one_byte (self) except? 0:
s = self.file.read(1)
if len(s) != 1:
raise EndOfFileException, self.filename
return ord(s)
cdef object _get_string (self, length):
if self.closed:
raise EixReaderClosed
s = self.file.read(length)
if len(s) != length:
raise EndOfFileException, self.filename
return s
def get_number (self):
if self.closed:
raise EixReaderClosed
return self._get_number()
def close (self):
if self.closed:
raise EixReaderClosed
self.file.close()
self.closed = 1
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