class RawChunk():
def __init__(self, filename, bounds=Bounds(0,-1)):
self._file = File(filename)
self._bounds = bounds
def close(self):
self._file.close()
@property
def file(self):
return self._file
@property
def bounds(self):
return self._bounds
@property
def valid(self):
return self._bounds.apply(self._file.length).size > 0
@property
def size(self):
return self._bounds.apply(self._file.length).size
def __repr__(self):
return '<RawChunk %s%s>' % (self._file.name, self._bounds)
def read(self, limit=256):
return self._file.read(self._bounds, limit)
def readhex(self, limit=256):
return self._file.readhex(self._bounds, limit)
def readhexs(self, bounds, bytesperline=16):
return self._file.readhexs(self._bounds, bytesperline)
def crc32(self):
return self._file.crc32(self._bounds)
def adler32(self):
return self._file.adler32(self._bounds)
def md5(self):
return self._file.md5(self._bounds)
def _split(self, position):
# print 'D: cutting %s at %d' % (self._bounds, position)
if not self.bounds.contains(position):
before, after = (RawChunk(self._file.name, self._bounds), None)
else:
before = RawChunk(self._file.name, Bounds(self._bounds.start, position - 1))
after = RawChunk(self._file.name, Bounds(position, self._bounds.end))
before = before.valid and before or None
after = after.valid and after or None
self.close()
return (before, after)
def chop(self, bounds):
before, remains = self._split(bounds.start)
if remains is None:
chopped, after = (None, None)
else:
chopped, after = remains._split(bounds.end + 1)
return (before, chopped, after)
def cutat(self, position):
return self._split(position)
def debit(self, count, chopsize):
chops = []
remains = self
for i in range(0, count):
if remains is not None and remains.valid:
head, remains = remains._split(remains.bounds.start + chopsize)
chops.append(head)
chops.append(remains)
return chops
def divide(self, count):
chopsize = max(self.size / count, 1)
return self.debit(count, chopsize)
# r = RawChunk("test/data")
# print r
# print r.bounds.size
# print r.size
# print [ r.read() for r in r.debit(1, -1) ]
