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111 lines
3.2 KiB
Python
111 lines
3.2 KiB
Python
#!/usr/bin/env python
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"""
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$Id$
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Copyright (c) 2006-2012 sqlmap developers (http://www.sqlmap.org/)
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See the file 'doc/COPYING' for copying permission
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"""
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import os
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import pickle
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import tempfile
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from lib.core.settings import BIGARRAY_CHUNK_LENGTH
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class Cache:
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"""
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Auxiliary class used for storing cached chunks
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"""
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def __init__(self, index, data, dirty):
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self.index = index
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self.data = data
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self.dirty = dirty
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class BigArray(list):
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"""
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List-like class used for storing large amounts of data (disk cached)
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"""
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def __init__(self):
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self.chunks = [[]]
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self.cache = None
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self.length = 0
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self.filenames = set()
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def append(self, value):
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self.chunks[-1].append(value)
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if len(self.chunks[-1]) >= BIGARRAY_CHUNK_LENGTH:
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filename = self._dump(self.chunks[-1])
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del(self.chunks[-1][:])
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self.chunks[-1] = filename
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self.chunks.append([])
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def pop(self):
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if len(self.chunks[-1]) < 1:
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self.chunks.pop()
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with open(self.chunks[-1], "rb") as fp:
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self.chunks[-1] = pickle.load(fp)
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return self.chunks[-1].pop()
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def index(self, value):
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for index in xrange(len(self)):
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if self[index] == value:
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return index
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return ValueError, "%s is not in list" % value
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def _dump(self, value):
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handle, filename = tempfile.mkstemp()
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self.filenames.add(filename)
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os.close(handle)
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with open(filename, "w+b") as fp:
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pickle.dump(value, fp)
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return filename
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def _checkcache(self, index):
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if (self.cache and self.cache.index != index and self.cache.dirty):
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filename = self._dump(self.cache.data)
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self.chunks[self.cache.index] = filename
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if not (self.cache and self.cache.index == index):
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with open(self.chunks[index], "rb") as fp:
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self.cache = Cache(index, pickle.load(fp), False)
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def __getitem__(self, y):
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index = y / BIGARRAY_CHUNK_LENGTH
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offset = y % BIGARRAY_CHUNK_LENGTH
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chunk = self.chunks[index]
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if isinstance(chunk, list):
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return chunk[offset]
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else:
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self._checkcache(index)
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return self.cache.data[offset]
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def __setitem__(self, y, value):
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index = y / BIGARRAY_CHUNK_LENGTH
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offset = y % BIGARRAY_CHUNK_LENGTH
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chunk = self.chunks[index]
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if isinstance(chunk, list):
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chunk[offset] = value
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else:
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self._checkcache(index)
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self.cache.data[offset] = value
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self.cache.dirty = True
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def __repr__(self):
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return "%s%s" % ("..." if len(self.chunks) > 1 else "", self.chunks[-1].__repr__())
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def __iter__(self):
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for i in xrange(len(self)):
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yield self[i]
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def __len__(self):
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return len(self.chunks[-1]) if len(self.chunks) == 1 else (len(self.chunks) - 1) * BIGARRAY_CHUNK_LENGTH + len(self.chunks[-1])
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def __del__(self):
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for filename in self.filenames:
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try:
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os.remove(filename)
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except OSError:
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pass
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