CN109246297B - Method, device and storage medium for determining factory reset time of mobile terminal - Google Patents

Method, device and storage medium for determining factory reset time of mobile terminal Download PDF

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Publication number
CN109246297B
CN109246297B CN201810993089.4A CN201810993089A CN109246297B CN 109246297 B CN109246297 B CN 109246297B CN 201810993089 A CN201810993089 A CN 201810993089A CN 109246297 B CN109246297 B CN 109246297B
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time
mobile terminal
max
local
information
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CN109246297A (en
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戴家康
陈明辉
黄加红
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Xiamen Meiya Pico Information Co Ltd
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Xiamen Meiya Pico Information Co Ltd
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M1/00Substation equipment, e.g. for use by subscribers
    • H04M1/72Mobile telephones; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selection
    • H04M1/724User interfaces specially adapted for cordless or mobile telephones
    • H04M1/72448User interfaces specially adapted for cordless or mobile telephones with means for adapting the functionality of the device according to specific conditions
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W8/00Network data management
    • H04W8/22Processing or transfer of terminal data, e.g. status or physical capabilities

Abstract

The invention provides a method, a device and a storage medium for determining factory reset time of a mobile terminal, wherein the method comprises the following steps: an extraction step of extracting time information from a system file of the mobile terminal; and a determining step of determining the time for restoring the factory setting of the mobile terminal based on the time information. According to the method and the device, the time information is extracted from the system file of the mobile terminal, the time for restoring the factory setting of the mobile terminal is determined based on the time information, namely the time for the mobile terminal to be in the active state at the latest time is determined by analyzing the system file and the log, the earliest time in the time left after some useless time in the system is removed, and the time increment of the system is further determined, so that the time for restoring the factory setting of the terminal at the latest time is estimated, and the accuracy for determining the operation time for restoring the factory setting of the terminal is improved.

Description

Method, device and storage medium for determining factory reset time of mobile terminal
Technical Field
The invention relates to the technical field of data security, in particular to a method, a device and a storage medium for determining factory reset time of a mobile terminal.
Background
The smart phone is a general name which has an independent operating system and an independent operating space like a personal computer, can be used by a user to install programs provided by third-party service providers such as software, games, navigation and the like, and can realize wireless network access to a mobile phone type through a mobile communication network. Therefore, the smart phone is widely used, and in some cases, it is necessary to obtain the time for restoring the factory settings of the mobile phone, for example, the mobile phone which is possibly subjected to evidence collection in the practical process of mobile phone evidence collection is restored to the factory settings, how to estimate the operation time for restoring the factory settings of the mobile phone which is restored to the factory settings, all current mobile phone evidence collection products cannot output related results, and the determination of the operation time for restoring the factory settings of the mobile phone in some practical work plays an important role.
Disclosure of Invention
The present invention provides the following technical solutions to overcome the above-mentioned drawbacks in the prior art.
A method for determining factory reset time of a mobile terminal comprises the following steps:
an extraction step of extracting time information from a system file of the mobile terminal;
and a determining step of obtaining the maximum time information and the minimum time information from the time information to determine the time for restoring the mobile terminal to the factory setting.
Furthermore, the system of the mobile terminal is an android system, and the mobile terminal is a mobile phone, a tablet computer, a notebook computer or a PDA.
Further, the extracting step operates as:
searching the log file under the "/cache/recovery/" directory of the android system, searching the ro.build.date.utc information in the log file to determine the compiling time T of the systembuild
Resource information file set F1{ F under "/data" directory in file system of android system1,F2…FnThe time information in the sequence is filtered and converted to obtain a sorted time set T { T }1,T2…Tn};
Determination of Tmax,TmaxWhich represents the maximum time in the system, i.e. the time the mobile terminal was in the active state the last time, wherein,
Tmax=fmax(T1,T2…Tn);
determination of Tmin,TminRepresenting the minimum time in the system, namely the earliest time in the time left after removing some useless time in the system; wherein n represents the number of files.
Further, T is determinedminThe method comprises the following steps:
judging whether a 'time/' directory exists in the resource information file set F1, if so, the time of the directory resource is the time of the system time set after the mobile phone is restored to factory settings, namely Tmin
Or
Filtering out the time value with the most occurrence times in the time set T to obtain a sorted time set T '{ T'1,T′2…T′mGet the minimum value T from Tmin=fmin(T′1,T′2…T′m) Judgment of Tlocal-Tbuild>Tmax-TminIf true, TminIf not, the value of T is calculatedminDeleting from T' and obtaining the minimum value T in the deleted setminAnd determining Tlocal-Tbuild>Tmax-TminIf yes, repeating the above operations until T is found to be satisfiedlocal-Tbuild>Tmax-TminT ofmin(ii) a Wherein, TlocalM is an integer less than n, which is the current time of the mobile terminal.
Still further, the determining step operates to: calculating an incremental time TΔ=Tmax-TminThen, the time T for restoring the factory setting of the mobile terminal is determinedr=Tlocal-TΔ
The invention also provides a device for determining the factory reset time of the mobile terminal, which comprises:
an extraction unit for extracting time information from a system file of the mobile terminal;
and the determining unit is used for obtaining the maximum time information and the minimum time information from the time information so as to determine the time for restoring the mobile terminal to the factory setting.
Furthermore, the system of the mobile terminal is an android system, and the mobile terminal is a mobile phone, a tablet computer, a notebook computer or a PDA.
Still further, the extraction unit performs the operations of:
searching the log file under the "/cache/recovery/" directory of the android system, searching the ro.build.date.utc information in the log file to determine the compiling time T of the systembuild
Resource information file set F1{ F under "/data" directory in file system of android system1,F2…FnThe time information in the sequence is filtered and converted to obtain a sorted time set T { T }1,T2…Tn};
Determination of Tmax,TmaxWhich represents the maximum time in the system, i.e. the time the mobile terminal was in the active state the last time, wherein,
Tmax=fmax(T1,T2…Tn);
determination of Tmin,TminRepresenting the minimum time in the system, namely the earliest time in the time left after removing some useless time in the system; wherein n represents the number of files.
Further, T is determinedminThe method comprises the following steps:
judging whether a 'time/' directory exists in the resource information file set F1, if so, the time of the directory resource is the time of the system time set after the mobile phone is restored to factory settings, namely Tmin
Or
Filtering out the time value with the most occurrence times in the time set T to obtain a sorted time set T '{ T'1,T′2…T′mGet the minimum value T from Tmin=fmin(T′1,T′2…T′m) Judgment of Tlocal-Tbuild>Tmax-TminIf true, TminIf not, the value of T is calculatedminDeleting from T' and obtaining the minimum value T in the deleted setminAnd determining Tlocal-Tbuild>Tmax-TminIf yes, repeating the above operations until T is found to be satisfiedlocal-Tbuild>Tmax-TminT ofmin(ii) a Wherein, TlocalM is an integer less than n, which is the current time of the mobile terminal.
Still further, the determining unit performs the operations of: calculating an incremental time TΔ=Tmax-TminThen, the time T for restoring the factory setting of the mobile terminal is determinedr=Tlocal-TΔ
The invention also proposes a computer-readable storage medium having stored thereon computer program code which, when executed by a computer, performs any of the methods described above.
The invention has the technical effects that: according to the method and the device, the time information is extracted from the system file of the mobile terminal, the time for restoring the factory setting of the mobile terminal is determined based on the time information, namely the time for the mobile terminal to be in the active state at the latest time is determined by analyzing the system file and the log, the earliest time in the time left after some useless time in the system is removed, and the time increment of the system is further determined, so that the time for restoring the factory setting of the terminal at the latest time is estimated, and the accuracy for determining the operation time for restoring the factory setting of the terminal is improved.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings.
Fig. 1 is a flowchart of a method for determining factory reset time of a mobile terminal according to an embodiment of the present invention.
Fig. 2 is a block diagram of an apparatus for determining a factory reset time of a mobile terminal according to an embodiment of the present invention.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the related invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
The principle of the invention is that the Android mobile phone is taken as an example, and the increment time T is used as the basisΔThe recovery time is presumed, the obtained result is accurate to the hour, and the mobile phone is foundMaximum time T ofmaxAnd a minimum time Tmin,TmaxIs the latest time, T, in the mobile phone file systemminIn order to eliminate the earliest time in the time left after some useless time, the time information needing to be eliminated is mainly the time which is set by default for some system files when the mobile phone system is compiled, the time is irregular, but is generally the time T of the current compiling day of the mobile phone systembuild. Extracting time information analysis of resources in mobile phone file system to obtain TmaxAnd TminThe incremental time is TmaxAnd TminBy the difference of (a), and then by the local current time (current local time) TlocalThe time T for the mobile phone to restore the factory setting last time can be obtained by subtracting the incremental timer
Fig. 1 illustrates a method for determining factory reset time of a mobile terminal according to the present invention, which includes:
and an extraction step S101, extracting time information from the system file of the mobile terminal.
In an embodiment, the system of the mobile terminal is an android system, but may also be other systems such as an apple system, and the like, and the mobile terminal is a mobile phone, a tablet computer, a notebook computer, a PDA, and the like, and of course, one terminal may also be other portable electronic devices.
And a determining step S102, determining the time for restoring the factory setting of the mobile terminal based on the time information.
In order to accurately determine the time for restoring the factory setting of the mobile terminal, corresponding time information needs to be extracted from a system file and a log file, which is a key step of the present invention, and the operation of the extracting step S101 is as follows:
in one embodiment, log files under a/cache/recovery/directory of an android system are searched, and robuild. Taking a mobile phone as an example, some log files exist under a "/cache/recovery/" directory of the mobile phone, and each time the mobile phone enters a recovery mode, a log file is generated, wherein the log file records the last time of enteringAnd (4) entering a log of a recovery mode, and searching ro.
In one embodiment, resource information file set F1{ F under "/data" directory in file system for android system1,F2…FnThe time information in the sequence is filtered and converted to obtain a sorted time set T { T }1,T2…Tn}. For example, the same time information in the time set may be filtered, and the time with the largest number of repetitions may be removed
Determination of Tmax,TmaxThe maximum time in the system, i.e. the time the mobile terminal was in the active state the last time, is represented by: the "/data/system" directory records the maximum time in the system, the directory in the mobile phone file system records the time when the mobile phone is in the active state last time, and the resource time under the directory can be checked in F1 to confirm TmaxWherein, in the step (A),
Tmax=fmax(T1,T2…Tn)。
determination of Tmin,TminRepresenting the minimum time in the system, namely the earliest time in the time left after removing some useless time in the system; wherein n represents the number of files.
Determination of TminThe method is relatively complex, mainly comprises the following two methods, which are also one of the important invention points of the invention, and the T is determinedminOne of the methods of (1) is: judging whether a 'time/' directory exists in the resource information file set F1, if so, the time of the directory resource is the time of the system time set after the mobile phone is restored to factory settings, namely Tmin
Determination of TminThe second method comprises the following steps: the time value with the most occurrence times in the time set T is filtered (the theoretical basis is that the data partition is restored after the mobile phone restores the factory setting, and a plurality of resources under the data partition are reset, namely the time of a plurality of resources is TbuildNearby, the reset resources are often very much, the time is not practical, and the number of occurrences of the reset resources needing to be eliminated is the greatestThe time information of more) to obtain a sorted time set T '{ T'1,T′2…T′mGet the minimum value T from Tmin=fmin(T′1,T′2…T′m) Judgment of Tlocal-Tbuild>Tmax-TminIf true, TminIf not, the value of T is calculatedminDeleting from T' and obtaining the minimum value T in the deleted setminAnd determining Tlocal-Tbuild>Tmax-TminIf yes, repeating the above operations until T is found to be satisfiedlocal-Tbuild>Tmax-TminT ofmin(ii) a Wherein, TlocalM is an integer less than n, which is the current time of the mobile terminal.
The operation of the determining step S102 is: calculating an incremental time TΔ=Tmax-TminThen, the time T for restoring the factory setting of the mobile terminal is determinedr=Tlocal-TΔ
The method is used for testing a plurality of mobile phones, for example, samsung c5000, vivo x7 and X620 are tested, and the factory recovery time of the obtained mobile phones is more consistent with the actual situation.
The invention can eliminate invalid time data from a large amount of time information existing in the mobile terminal, thereby estimating the time for the mobile terminal to restore factory settings for the last time, and if the mobile terminal does not perform the operation, the estimated result is the time for the mobile terminal to use for the first time.
With further reference to fig. 2, as an implementation of the method shown in fig. 1, the present application provides an embodiment of an apparatus for determining factory reset time of a mobile terminal, where the embodiment of the apparatus corresponds to the embodiment of the method shown in fig. 1, and the apparatus may be specifically included in various electronic devices.
Fig. 2 shows an apparatus for determining factory reset time of a mobile terminal according to the present invention, which includes:
an extracting unit 201, configured to extract time information from a system file of the mobile terminal.
In an embodiment, the system of the mobile terminal is an android system, but may also be other systems such as an apple system, and the like, and the mobile terminal is a mobile phone, a tablet computer, a notebook computer, a PDA, and the like, and of course, one terminal may also be other portable electronic devices.
A determining unit 202, configured to determine, based on the time information, a time for restoring factory settings of the mobile terminal.
In order to accurately determine the time for restoring the factory setting of the mobile terminal, corresponding time information needs to be extracted from the system file and the log file, which is a key step of the present invention, and the extracting unit 201 performs the following operations:
in one embodiment, log files under a/cache/recovery/directory of an android system are searched, and robuild. Taking a mobile phone as an example, a certain log file exists under a "/cache/recovery/" directory of the mobile phone, and the mobile phone generates a log file each time the mobile phone enters the recovery mode, wherein the log file records the log of the last entry of the recovery mode, and the ro.
In one embodiment, resource information file set F1{ F under "/data" directory in file system for android system1,F2…FnThe time information in the sequence is filtered and converted to obtain a sorted time set T { T }1,T2…Tn}. For example, the same time information in the time set may be filtered, and the time with the largest number of repetitions may be removed
Determination of Tmax,TmaxThe maximum time in the system, i.e. the time the mobile terminal was in the active state the last time, is represented by: the "/data/system" directory records the maximum time in the system, the directory in the mobile phone file system records the time when the mobile phone is in the active state last time, and the resource time under the directory can be checked in F1 to confirm TmaxWherein, in the step (A),
Tmax=fmax(T1,T2…Tn)。
determination of Tmin,TminRepresenting the minimum time in the system, namely the earliest time in the time left after removing some useless time in the system; wherein n represents the number of files.
Determination of TminThe method is relatively complex, mainly comprises the following two methods, which are also one of the important invention points of the invention, and the T is determinedminOne of the methods of (1) is: judging whether a 'time/' directory exists in the resource information file set F1, if so, the time of the directory resource is the time of the system time set after the mobile phone is restored to factory settings, namely Tmin
Determination of TminThe second method comprises the following steps: the time value with the most occurrence times in the time set T is filtered (the theoretical basis is that the data partition is restored after the mobile phone restores the factory setting, and a plurality of resources under the data partition are reset, namely the time of a plurality of resources is TbuildNearby, the reset resources are often very much, the time has no practical meaning, and the time information with the most occurrence times needs to be removed) to obtain an ordered time set T '{ T'1,T′2…T′mGet the minimum value T from Tmin=fmin(T′1,T′2…T′m) Judgment of Tlocal-Tbuild>Tmax-TminIf true, TminIf not, the value of T is calculatedminDeleting from T' and obtaining the minimum value T in the deleted setminAnd determining Tlocal-Tbuild>Tmax-TminIf yes, repeating the above operations until T is found to be satisfiedlocal-Tbuild>Tmax-TminT ofmin(ii) a Wherein, TlocalM is an integer less than n, which is the current time of the mobile terminal.
The determining unit 202 performs the following operations: calculating an incremental time TΔ=Tmax-TminThen, the time T for restoring the factory setting of the mobile terminal is determinedr=Tlocal-TΔ
Referring to the above actual tests, the present invention extracts time information from the system file of the mobile terminal, and then determines the time for restoring the factory settings of the mobile terminal based on the time information, that is, determines the time of the mobile terminal in the active state for the last time by analyzing the system file and the log, and eliminates the earliest time of the remaining time after some dead time in the system, thereby determining the time increment of the system, so as to estimate the time for restoring the factory settings of the terminal for the last time, and improve the accuracy of determining the operation time for restoring the factory settings of the terminal.
For convenience of description, the above devices are described as being divided into various units by function, and are described separately. Of course, the functionality of the units may be implemented in one or more software and/or hardware when implementing the present application.
From the above description of the embodiments, it is clear to those skilled in the art that the present application can be implemented by software plus necessary general hardware platform. Based on such understanding, the technical solutions of the present application may be essentially or partially implemented in the form of a software product, which may be stored in a storage medium, such as a ROM/RAM, a magnetic disk, an optical disk, etc., and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method according to the embodiments or some parts of the embodiments of the present application.
Finally, it should be noted that: although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.

Claims (9)

1. A method for determining factory reset time of a mobile terminal is characterized by comprising the following steps:
an extraction step of extracting time information including maximum time information T from a system file of the mobile terminalmaxAnd minimum time information TminWherein, TmaxIndicating the maximum time in the system, i.e. the time the mobile terminal was in the active state the last time, TminRepresenting the minimum time in the system, namely the earliest time in the time left after removing some useless time in the system;
a determination step of obtaining the maximum time information TmaxAnd the minimum time information TminTo determine the time T for restoring the factory setting of the mobile terminalrThe specific calculation formula is as follows:
TΔ=Tmax-Tmin
Tr=Tlocal-TΔ
wherein, TΔFor incremental time, TlocalIs the current time of the mobile terminal.
2. The method according to claim 1, wherein the system of the mobile terminal is an android system, and the mobile terminal is a mobile phone, a tablet computer, a notebook computer or a PDA.
3. The method of claim 2, wherein the extracting step operates to:
searching the log file under the "/cache/recovery/" directory of the android system, searching the ro.build.date.utc information in the log file to determine the compiling time T of the systembuild
Resource information file set F1{ F under "/data" directory in file system of android system1,F2...FnThe time information in the sequence is filtered and converted to obtain a sorted time set T { T }1,T2...Tn},Wherein, TmaxIs the maximum value of T.
4. The method of claim 3, wherein T is determinedminThe method comprises the following steps:
judging whether a 'time/' directory exists in the resource information file set F1, if so, the time of the directory resource is the time of the system time set after the mobile phone is restored to factory settings, namely Tmin
Or
Filtering out the time value with the most occurrence times in the time set T to obtain a sorted time set T '{ T'1,T′2...T′mGet the minimum value T from TminJudgment of Tlocal-Tbuild>Tmax-TminIf true, TminIf not, the value of T is calculatedminDeleting from T' and obtaining the minimum value T in the deleted setminAnd determining Tlocal-Tbuild>Tmax-TminIf yes, repeating the above operations until T is found to be satisfiedlocal-Tbuild>Tmax-TminT ofmin
Wherein, TlocalM is an integer less than n, which is the current time of the mobile terminal.
5. An apparatus for determining factory reset time of a mobile terminal, the apparatus comprising:
an extracting unit for extracting time information including maximum time information T from the system file of the mobile terminalmaxAnd minimum time information TminWherein, TmaxIndicating the maximum time in the system, i.e. the time the mobile terminal was in the active state the last time, TminRepresenting the minimum time in the system, namely the earliest time in the time left after removing some useless time in the system;
a determination unit obtaining the maximum time information TmaxAnd the minimum time information TminTo determineTime T for restoring factory setting of mobile terminalrThe specific calculation formula is as follows:
TΔ=Tmax-Tmin
Tr=Tlocal-TΔ
wherein, TΔFor incremental time, TlocalIs the current time of the mobile terminal.
6. The device according to claim 5, wherein the system of the mobile terminal is an android system, and the mobile terminal is a mobile phone, a tablet computer, a notebook computer or a PDA.
7. The apparatus of claim 6, wherein the extraction unit performs the operations of:
searching the log file under the "/cache/recovery/" directory of the android system, searching the ro.build.date.utc information in the log file to determine the compiling time T of the systembuild
Resource information file set F1{ F under "/data" directory in file system of android system1,F2...FnThe time information in the sequence is filtered and converted to obtain a sorted time set T { T }1,T2...TnIn which T ismaxIs the maximum value of T.
8. The apparatus of claim 7, wherein T is determinedminThe method comprises the following steps:
judging whether a 'time/' directory exists in the resource information file set F1, if so, the time of the directory resource is the time of the system time set after the mobile phone is restored to factory settings, namely Tmin
Or
Filtering out the time value with the most occurrence times in the time set T to obtain a sorted time set T '{ T'1,T′2...T′mGet the minimum value T from TminJudgment of Tlocal-Tbuild>Tmax-TminIf true, TminIf not, the value of T is calculatedminDeleting from T' and obtaining the minimum value T in the deleted setminAnd determining Tlocal-Tbuild>Tmax-TminIf yes, repeating the above operations until T is found to be satisfiedlocal-Tbuild>Tmax-TminT ofmin
Wherein, TlocalM is an integer less than n, which is the current time of the mobile terminal.
9. A computer-readable storage medium, characterized in that the storage medium has stored thereon computer program code which, when executed by a computer, performs the method of any of claims 1-4.
CN201810993089.4A 2018-08-29 2018-08-29 Method, device and storage medium for determining factory reset time of mobile terminal Active CN109246297B (en)

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