Recombination method for irrelevant mirror images of file system

A file system and mirroring technology, applied in the field of mirror reorganization, can solve the problem of not being able to handle the mirror reorganization of unknown file systems

Active Publication Date: 2015-12-23
XIAMEN MEIYA PICO INFORMATION
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Problems solved by technology

This scheme cannot handle mirror re

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  • Recombination method for irrelevant mirror images of file system
  • Recombination method for irrelevant mirror images of file system
  • Recombination method for irrelevant mirror images of file system

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Embodiment Construction

[0029] The present invention will be further described in conjunction with the accompanying drawings and specific embodiments.

[0030] As a specific example, such as figure 1 As shown, a file system-independent image reorganization method of the present invention comprises the following steps:

[0031] Step 1. Obtaining the image step: obtaining the physical image of the mobile terminal, and analyzing the physical structure of the physical image. Use the acquisition tool to obtain the physical image of the mobile phone and analyze the physical structure. Belong to NOR type or NAND type, NAND type belongs to "512+16" structure or "2048+64" other structures.

[0032] Step 2. Get the header mark Step: Traverse all physical blocks, take the first N bytes of each physical block as the mark of the physical block head, count the number of occurrences of the head mark, and sort by the number of times from large to small Sort physical blocks. Specifically, take the characteristic ...

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Abstract

The invention relates to the technical field of information security and mobile phone applications, in particular to a recombination method for irrelevant mirror images of a file system. The method includes the mirror image acquisition step, the head mark taking step, the mark confirming step and the group type and head length confirming step. In the mirror image acquisition step, physical mirror images of a mobile terminal are acquired, and physical structures of the physical mirror images are analyzed. In the head marker taking step, front N bytes of each physical block are taken as head marks of the physical block. In the mark confirming step, data of one physical block where the head marks are located are read, whether the physical block is a mapping table or not is judged, if yes, the next step is executed, and if not, the next physical block is skipped, and the head mark taking step is executed again. In the group type and head length confirming step, all mapping information of the heads of one group is traversed, one logical block number is taken out according to the marks, a physical address is calculated according to the formula that the physical address=group physical address offset + group head length + mapping length * marker serial number, the next physical block address is skipped, the head mark taking step is returned, and the process continues to be executed till all the physical block addresses are traversed. Recombination efficiency is high.

Description

technical field [0001] The invention relates to the technical field of information security and mobile phone application, in particular to a file system-independent image reorganization method. Background technique [0002] refer to figure 1 As shown, due to the erasure life of the FLASH physical block, in order to balance the management, the logical address of the file system built above does not correspond to the address of the FLASH physical block continuously, but establishes a mapping relationship. When accessing the FLASH file system, you must first find out the mapping relationship, that is, reorganize the file system to obtain continuous logical addresses. The currently proposed reorganization methods are mainly aimed at mirrors of known file systems. The mainstream applications include: reorganization of FAT-like file systems on NOR mirrors, reorganization of FAT-like file systems and YAFFS file systems on NAND mirrors. [0003] The existing reorganization technol...

Claims

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Application Information

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IPC IPC(8): G06F3/06
Inventor 李永兴张辉极陈明辉
Owner XIAMEN MEIYA PICO INFORMATION
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