mirror of
https://github.com/JimmXinu/FanFicFare.git
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92 lines
3.6 KiB
Python
92 lines
3.6 KiB
Python
#!/usr/bin/python
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# -*- coding: utf-8 -*-
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# Copyright (c) 2012, Jean-Rémy Bancel <jean-remy.bancel@telecom-paristech.org>
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are met:
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# * Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# * Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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# * Neither the name of the Chromagon Project nor the
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# names of its contributors may be used to endorse or promote products
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# derived from this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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# DISCLAIMED. IN NO EVENT SHALL Jean-Rémy Bancel BE LIABLE FOR ANY
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# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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"""
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Chrome Cache Address
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See /net/disk_cache/addr.h for design details
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"""
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class CacheAddressError(Exception):
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def __init__(self, value):
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self.value = value
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def __str__(self):
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return repr(self.value)
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class CacheAddress():
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"""
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Object representing a Chrome Cache Address
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"""
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SEPARATE_FILE = 0
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RANKING_BLOCK = 1
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BLOCK_256 = 2
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BLOCK_1024 = 3
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BLOCK_4096 = 4
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typeArray = [("Separate file", 0),
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("Ranking block file", 36),
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("256 bytes block file", 256),
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("1k bytes block file", 1024),
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("4k bytes block file", 4096)]
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def __init__(self, uint_32, path):
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"""
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Parse the 32 bits of the uint_32
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"""
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if uint_32 == 0:
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raise CacheAddressError("Null Address")
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#XXX Is self.binary useful ??
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self.addr = uint_32
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self.path = path
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# Checking that the MSB is set
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self.binary = bin(uint_32)
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if len(self.binary) != 34:
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raise CacheAddressError("Uninitialized Address")
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self.blockType = int(self.binary[3:6], 2)
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# If it is an address of a separate file
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if self.blockType == CacheAddress.SEPARATE_FILE:
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self.fileSelector = "f_%06x" % int(self.binary[6:], 2)
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elif self.blockType == CacheAddress.RANKING_BLOCK:
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self.fileSelector = "data_" + str(int(self.binary[10:18], 2))
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else:
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self.entrySize = CacheAddress.typeArray[self.blockType][1]
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self.contiguousBlock = int(self.binary[8:10], 2)
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self.fileSelector = "data_" + str(int(self.binary[10:18], 2))
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self.blockNumber = int(self.binary[18:], 2)
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def __str__(self):
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string = hex(self.addr) + " ("
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if self.blockType >= CacheAddress.BLOCK_256:
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string += str(self.contiguousBlock) +\
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" contiguous blocks in "
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string += CacheAddress.typeArray[self.blockType][0] +\
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" : " + self.fileSelector + ")"
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return string
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