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https://github.com/JimmXinu/FanFicFare.git
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85 lines
3.9 KiB
Python
85 lines
3.9 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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Parse the header of a Chrome Cache File
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See http://www.chromium.org/developers/design-documents/network-stack/disk-cache
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for design details
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"""
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from __future__ import absolute_import
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import struct
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from six.moves import range
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class CacheBlock():
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"""
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Object representing a block of the cache. It can be the index file or any
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other block type : 256B, 1024B, 4096B, Ranking Block.
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See /net/disk_cache/disk_format.h for details.
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"""
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INDEX_MAGIC = 0xC103CAC3
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BLOCK_MAGIC = 0xC104CAC3
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INDEX = 0
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BLOCK = 1
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def __init__(self, filename):
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"""
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Parse the header of a cache file
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"""
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with open(filename, 'rb') as header:
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# Read Magic Number
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magic = struct.unpack('I', header.read(4))[0]
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# print("magic number:%s"%hex(magic))
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if magic == CacheBlock.BLOCK_MAGIC:
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self.type = CacheBlock.BLOCK
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header.seek(2, 1)
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self.version = struct.unpack('h', header.read(2))[0]
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self.header = struct.unpack('h', header.read(2))[0]
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self.nextFile = struct.unpack('h', header.read(2))[0]
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self.blockSize = struct.unpack('I', header.read(4))[0]
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self.entryCount = struct.unpack('I', header.read(4))[0]
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self.entryMax = struct.unpack('I', header.read(4))[0]
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self.empty = []
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for _ in range(4):
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self.empty.append(struct.unpack('I', header.read(4))[0])
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self.position = []
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for _ in range(4):
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self.position.append(struct.unpack('I', header.read(4))[0])
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elif magic == CacheBlock.INDEX_MAGIC:
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self.type = CacheBlock.INDEX
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header.seek(2, 1)
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self.version = struct.unpack('h', header.read(2))[0]
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self.entryCount = struct.unpack('I', header.read(4))[0]
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self.byteCount = struct.unpack('I', header.read(4))[0]
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self.lastFileCreated = "f_%06x" % \
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struct.unpack('I', header.read(4))[0]
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header.seek(4*2, 1)
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self.tableSize = struct.unpack('I', header.read(4))[0]
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else:
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raise Exception("Invalid Chrome Cache File")
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