CN117194343A - Zip file modification method, device, equipment and storage medium - Google Patents
Zip file modification method, device, equipment and storage medium Download PDFInfo
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Abstract
The application discloses a Zip file modification method, a Zip file modification device, zip file modification equipment and a Zip file storage medium, and relates to the technical fields of information security and computer application. The method comprises the following steps: determining an original area of an initial Zip file; the original area comprises an original data area, an original central recording area and an original tail area; generating a target area for modifying the initial Zip file according to the original area; and generating a target Zip file according to the original area and the target area. According to the technical scheme, the target area for modifying the Zip file is set, so that the modification efficiency of the Zip file is improved while lossless modification of the Zip file is ensured.
Description
Technical Field
The embodiment of the application relates to the technical fields of information security and computer application, in particular to the technical field of file compression, and particularly relates to a Zip file modification method, device and equipment and a storage medium.
Background
Zip files are popular compressed file formats, and by using compression algorithms, file indexes, directory structures and other technologies, a convenient file storage and sharing mode is provided, so that the Zip files are widely applied to the fields of file transmission, backup, archiving and the like.
In the prior art, modifying a Zip file, such as adding a file, compresses the new file into a data area, and then adding corresponding entries in a central recording area to adjust the offset of each area; deleting and replacing files also changes the Zip areas. However, modifying each area of the Zip is prone to damage to the file; and, if the Zip file is very large, modification of the individual areas of the Zip file takes a long time.
Disclosure of Invention
The application provides a method, a device, equipment and a storage medium for modifying a Zip file, which are used for improving the modification efficiency of the Zip file while ensuring lossless modification of the Zip file.
According to an aspect of the present application, there is provided a method for modifying a Zip file, the method comprising:
determining an original area of an initial Zip file; the original area comprises an original data area, an original central recording area and an original tail area;
generating a target area for modifying the initial Zip file according to the original area;
and generating a target Zip file according to the original area and the target area.
According to another aspect of the present application, there is provided a modification apparatus for a Zip file, the apparatus comprising:
the original area determining module is used for determining an original area of the initial Zip file; the original area comprises an original data area, an original central recording area and an original tail area;
the target area determining module is used for generating a target area for modifying the initial Zip file according to the original area;
and the file generation module is used for generating a target Zip file according to the original area and the target area.
According to another aspect of the present application, there is provided an electronic apparatus including:
one or more processors;
a memory for storing one or more programs;
when the one or more programs are executed by the one or more processors, the one or more processors implement any one of the methods for modifying a Zip file provided by the embodiments of the present application.
According to another aspect of the present application, there is provided a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements a method for modifying any one of the Zip files provided by the embodiments of the present application.
The method comprises the steps of determining an original area of an initial Zip file; the original area comprises an original data area, an original central recording area and an original tail area; generating a target area for modifying the initial Zip file according to the original area; and generating a target Zip file according to the original area and the target area. According to the technical scheme, the target area for modifying the Zip file is set, so that the modification efficiency of the Zip file is improved while lossless modification of the Zip file is ensured.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the application or to delineate the scope of the application. Other features of the present application will become apparent from the description that follows.
Drawings
FIG. 1 is a flowchart of a method for modifying a Zip file according to a first embodiment of the present application;
fig. 2 is a flowchart of a method for modifying a Zip file according to a second embodiment of the present application;
fig. 3 is a schematic structural diagram of a device for modifying a Zip file according to a third embodiment of the present application;
fig. 4 is a schematic structural diagram of an electronic device implementing a method for modifying a Zip file according to an embodiment of the present application.
Detailed Description
In order that those skilled in the art will better understand the present application, a technical solution in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the application described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In addition, in the technical scheme of the application, the related processing such as collection, storage, use, processing, transmission, provision and disclosure of the related data such as the region information and the original region are in accordance with the regulations of the related laws and regulations, and the public welfare is not violated.
Example 1
Fig. 1 is a flowchart of a method for modifying a Zip file according to a first embodiment of the present application, where the present embodiment is applicable to a case of modifying a Zip file, and the method may be performed by a device for modifying a Zip file, where the device for modifying a Zip file may be implemented in hardware and/or software, and the device for modifying a Zip file may be configured in a computer device, for example, a server. As shown in fig. 1, the method includes:
s110, determining an original area of an initial Zip file; wherein the original area includes an original data area, an original central recording area, and an original tail area.
The Zip file consists of a series of files and directories, containing compressed original files and associated metadata information. The initial Zip file refers to a Zip file that has not been modified. The original region refers to a constituent region of the original Zip file. The original data area is one of the constituent areas of the original Zip file for storing metadata information of the Zip file including at least one of a file format version number, creation and modification time of the file, size of the file, and CRC checksum, etc. The original central recording area is one of the constituent areas of the original Zip file for recording information such as file name, size, etc. of all compressed files. The original tail area is one of the constituent areas of the original Zip file, and is used for locating and reading the central record area, and includes the attributes such as the position offset of the central record area.
Specifically, an initial Zip file is opened, the initial Zip file is analyzed, and an original data area, an original central recording area and an original tail area in the Zip file are determined.
S120, generating a target area for modifying the initial Zip file according to the original area.
The target area is an area corresponding to the original area and used for modifying the Zip file, and comprises a data area, a central recording area and a tail area corresponding to each area in the original area, and the target area is used for storing and managing modification data of the initial Zip file.
Specifically, an original area of the initial Zip file is determined, and a target area corresponding to the original area and used for modifying the Zip file is generated according to the related information in the original area.
S130, generating a target Zip file according to the original area and the target area.
The target Zip file refers to a Zip file formed by an original area and a target area together.
Optionally, the target area is appended to the tail of the original area based on a file appending mechanism to generate the target Zip file.
The file append mechanism is a mechanism for adding content at the end of an existing file, and is used for appending new data to the existing file without destroying the content of the original file.
Specifically, based on a preset reading mode, reading content from an initial Zip file; locating a pointer of the initial Zip file to the end of the file; writing the target area to the tail of the initial Zip file by using a writing operation; closing the initial Zip file after finishing data writing; and taking the initial Zip file successfully written as a target Zip file.
The preset reading mode is set manually according to an actual situation or an empirical value, and may be at least one of a read-only mode and an additional mode, which is not particularly limited in the embodiment of the present application.
It will be appreciated that the use of a file append mechanism ensures that the target region is appended to the correct location of the original Zip and ensures the integrity of the file processing and the release of resources.
The embodiment of the application determines the original area of the initial Zip file; the original area comprises an original data area, an original central recording area and an original tail area; generating a target area for modifying the initial Zip file according to the original area; and generating a target Zip file according to the original area and the target area. According to the technical scheme, the target area for modifying the Zip file is set, so that the modification efficiency of the Zip file is improved while lossless modification of the Zip file is ensured.
Example two
Fig. 2 is a flowchart of a method for modifying a Zip file according to a second embodiment of the present application, where the "generating a target area for modifying an initial Zip file according to an original area" is thinned to "determine area information of the original area" based on the technical solutions of the above embodiments; the area information comprises current data of an original central recording area, a data format of the original data area and a file size of an initial Zip file; a target area for modifying the Zip file is generated from the area information. It should be noted that, in the embodiments of the present application, parts that are not described in detail may be referred to in the related description of other embodiments. As shown in fig. 2, the method includes:
s210, determining an original area of an initial Zip file; wherein the original area includes an original data area, an original central recording area, and an original tail area.
S220, determining the area information of the original area; wherein the area information includes current data of the original central recording area, a data format of the original data area, and a file size of the original Zip file.
The area information refers to related information of storing an initial Zip file in an original area, and includes at least one of a size of the file, a type of data, and the like. The current data of the original central recording area refers to information of all compressed files, such as at least one of file name, size, etc. The data format of the original data area refers to the format in which the current data area stores data. The file size of the initial Zip file refers to the storage space size occupied by the compressed Zip file.
Specifically, a preset reading mode is adopted to read information from an original area of the initial Zip file, and current data of an original central recording area, a data format of an original data area and a file size of the initial Zip file are recorded.
It should be noted that, the preset reading mode is set manually according to an actual situation or an empirical value, and the reading operation of the Zip file may be performed through at least one of a file API or a Zip library, which is not limited in particular in the embodiment of the present application.
S230, generating a target area for modifying the Zip file according to the area information.
Optionally, generating an additional data area, a new central recording area and a new tail area according to the area information; a target area for modifying the Zip file is determined based on the additional data area, the new central recording area and the new tail area.
The additional data area is an area for storing modification data of the Zip file. The new central recording area refers to an area for recording information of the modified file. The new tail area is used for recording an area of the new central recording area data offset.
Specifically, according to the data format of the original data area in the area information, the current data of the original central recording area and the file size of the initial Zip file, an additional data area, a new central recording area and a new tail area are sequentially generated, and the additional data area, the new central recording area and the new tail area are used for modifying the target area of the Zip file.
Further, generating an additional data area according to the data format of the original data area; generating a blank central recording area and a blank tail area; copying the current data of the original central recording area to a blank central recording area to generate a new central recording area; and saving the file size of the initial Zip file to the blank tail area to generate a new tail area.
Wherein the blank central recording area refers to a temporary central recording area in which no data information is stored. The blank tail area refers to a temporary tail area that does not store any data information.
Specifically, according to the data format of the original data area, an additional data area with consistent data format is generated; generating a blank central recording area, copying the current data of the original central recording area to the blank central recording area, and taking the blank central recording area stored with the current data of the original central recording area as a new central recording area; and generating a blank tail region, storing the file size of the initial Zip file into the blank tail region, and taking the blank tail region stored with the file size of the initial Zip file as a new tail region.
It can be understood that the information of the initial Zip file is copied to the target area, so that the modification of the Zip file in the target area can be realized without affecting the initial Zip file; and the new tail area records the file size of the initial Zip file, thereby being beneficial to restoring the file.
S240, generating a target Zip file according to the original area and the target area.
Optionally, the target Zip file is verified based on a preset file verification method.
Specifically, after the target Zip file is generated, the file content, the file size, the function and the like of the target Zip file are verified based on a preset file verification method.
It should be noted that, the preset file verification method includes at least one of data and verification, file size comparison, file content comparison, and functional test, which is not limited in particular in the embodiment of the present application.
Illustratively, determining an original region and a target region of the target Zip file, and comparing the original region and the target region of the target Zip file to determine whether the contents of the original region and the target region of the target Zip file are correct; or, performing a specific functional test on the target Zip file to verify whether the target Zip file can be used to modify the Zip file.
Further, if the verification is passed, determining that the target Zip file is normal; if the verification is not passed, performing anomaly detection on the target Zip file.
The anomaly detection is used for detecting the anomaly condition in the target Zip file and the reason of the anomaly condition; the abnormal condition may be at least one of the inability to add or delete files to or from the target area.
It can be understood that the target Zip file is further checked, so that the normal use of the target Zip file can be effectively ensured, and the problems of file damage and the like caused by the abnormality of the target Zip file and subsequent modification are avoided.
The embodiment of the application determines the original area of the initial Zip file; the original area comprises an original data area, an original central recording area and an original tail area; determining area information of an original area; the area information comprises current data of an original central recording area, a data format of the original data area and a file size of an initial Zip file; generating a target area for modifying the Zip file according to the area information; and generating a target Zip file according to the original area and the target area. According to the technical scheme, the target area is generated according to the information of each area of the initial Zip file, so that the Zip file in the target area can be modified without influencing the initial Zip file, and the modification efficiency of the Zip file is improved.
Example III
Fig. 3 is a schematic structural diagram of a device for modifying a Zip file according to a third embodiment of the present application, which may be suitable for modifying a Zip file, where the device for modifying a Zip file may be implemented in hardware and/or software, and the device for modifying a Zip file may be configured in a computer device, for example, a server. As shown in fig. 3, the apparatus includes:
an original region determining module 310, configured to determine an original region of the initial Zip file; the original area comprises an original data area, an original central recording area and an original tail area;
a target area determining module 320, configured to generate a target area for modifying the initial Zip file according to the original area;
the file generating module 330 is configured to generate a target Zip file according to the original area and the target area.
The embodiment of the application determines the original area of the initial Zip file; the original area comprises an original data area, an original central recording area and an original tail area; generating a target area for modifying the initial Zip file according to the original area; and generating a target Zip file according to the original area and the target area. According to the technical scheme, the target area for modifying the Zip file is set, so that the modification efficiency of the Zip file is improved while lossless modification of the Zip file is ensured.
Optionally, the target area determining module 320 includes:
an information determining unit for determining area information of an original area; the area information comprises current data of an original central recording area, a data format of the original data area and a file size of an initial Zip file;
and the area determining unit is used for generating a target area for modifying the Zip file according to the area information.
Optionally, the area determining unit includes:
an area generating subunit for generating an additional data area, a new central recording area and a new tail area according to the area information;
and the area determining subunit is used for determining a target area for modifying the Zip file according to the additional data area, the new central recording area and the new tail area.
Optionally, the region generating subunit is specifically configured to:
generating an additional data area according to the data format of the original data area;
generating a blank central recording area and a blank tail area;
copying the current data of the original central recording area to a blank central recording area to generate a new central recording area;
and saving the file size of the initial Zip file to the blank tail area to generate a new tail area.
Optionally, the file generating module 330 is specifically configured to:
and adding the target area to the tail of the original area based on a file adding mechanism to generate a target Zip file.
Optionally, the modification device of the Zip file further includes:
and the file verification module is used for verifying the target Zip file based on a preset file verification method.
Optionally, the file verification module is further configured to:
if the verification is passed, determining that the target Zip file is normal;
if the verification is not passed, performing anomaly detection on the target Zip file.
The device for modifying the Zip file provided by the embodiment of the application can execute the method for modifying the Zip file provided by any embodiment of the application, and has the corresponding functional modules and beneficial effects of executing the method for modifying each Zip file.
Example IV
Fig. 4 is a schematic structural diagram of an electronic device 410 implementing a method for modifying a Zip file according to an embodiment of the present application. Electronic devices are intended to represent various forms of digital computers, such as laptops, desktops, workstations, personal digital assistants, servers, blade servers, mainframes, and other appropriate computers. Electronic equipment may also represent various forms of mobile devices, such as personal digital processing, cellular telephones, smartphones, wearable devices (e.g., helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions, are meant to be exemplary only, and are not meant to limit implementations of the applications described and/or claimed herein.
As shown in fig. 4, the electronic device 410 includes at least one processor 411, and a memory, such as a Read Only Memory (ROM) 412, a Random Access Memory (RAM) 413, etc., communicatively connected to the at least one processor 411, wherein the memory stores computer programs executable by the at least one processor, and the processor 411 may perform various suitable actions and processes according to the computer programs stored in the Read Only Memory (ROM) 412 or the computer programs loaded from the storage unit 418 into the Random Access Memory (RAM) 413. In the RAM413, various programs and data required for the operation of the electronic device 410 may also be stored. The processor 411, the ROM412, and the RAM413 are connected to each other through a bus 414. An input/output (I/O) interface 415 is also connected to bus 414.
Various components in the electronic device 410 are connected to the I/O interface 415, including: an input unit 416 such as a keyboard, a mouse, etc.; an output unit 417 such as various types of displays, speakers, and the like; a storage unit 418, such as a magnetic disk, optical disk, or the like; and a communication unit 419 such as a network card, modem, wireless communication transceiver, etc. The communication unit 419 allows the electronic device 410 to exchange information/data with other devices through a computer network such as the internet and/or various telecommunication networks.
The processor 411 may be a variety of general and/or special purpose processing components having processing and computing capabilities. Some examples of processor 411 include, but are not limited to, a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), various specialized Artificial Intelligence (AI) computing chips, various processors running machine learning model algorithms, digital Signal Processors (DSPs), and any suitable processor, controller, microcontroller, etc. The processor 411 performs the various methods and processes described above, such as the modification of Zip files.
In some embodiments, the method of modifying a Zip file may be implemented as a computer program tangibly embodied on a computer-readable storage medium, such as storage unit 418. In some embodiments, some or all of the computer program may be loaded and/or installed onto the electronic device 410 via the ROM412 and/or the communication unit 419. When the computer program is loaded into RAM413 and executed by processor 411, one or more steps of the modification method of the Zip file described above may be performed. Alternatively, in other embodiments, the processor 411 may be configured as a modification method of the Zip file in any other suitable way (e.g., by means of firmware).
Various implementations of the systems and techniques described here above may be implemented in digital electronic circuitry, integrated circuit systems, field Programmable Gate Arrays (FPGAs), application Specific Integrated Circuits (ASICs), application Specific Standard Products (ASSPs), systems On Chip (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and/or combinations thereof. These various embodiments may include: implemented in one or more computer programs, the one or more computer programs may be executed and/or interpreted on a programmable system including at least one programmable processor, which may be a special purpose or general-purpose programmable processor, that may receive data and instructions from, and transmit data and instructions to, a storage system, at least one input device, and at least one output device.
A computer program for carrying out methods of the present application may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the computer programs, when executed by the processor, cause the functions/acts specified in the flowchart and/or block diagram block or blocks to be implemented. The computer program may execute entirely on the machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.
In the context of the present application, a computer-readable storage medium may be a tangible medium that can contain, or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. The computer readable storage medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. Alternatively, the computer readable storage medium may be a machine readable signal medium. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
To provide for interaction with a user, the systems and techniques described here can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to a user; and a keyboard and a pointing device (e.g., a mouse or a trackball) through which a user can provide input to the electronic device. Other kinds of devices may also be used to provide for interaction with a user; for example, feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form, including acoustic input, speech input, or tactile input.
The systems and techniques described here can be implemented in a computing system that includes a background component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front-end component (e.g., a user computer having a graphical user interface or a web browser through which a user can interact with an implementation of the systems and techniques described here), or any combination of such background, middleware, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: local Area Networks (LANs), wide Area Networks (WANs), blockchain networks, and the internet.
The computing system may include clients and servers. The client and server are typically remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other. The server can be a cloud server, also called a cloud computing server or a cloud host, and is a host product in a cloud computing service system, so that the defects of high management difficulty and weak service expansibility in the traditional physical hosts and VPS service are overcome.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present application may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present application are achieved, and the present application is not limited herein.
The above embodiments do not limit the scope of the present application. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the scope of the present application.
Claims (10)
1. A method for modifying a Zip file, comprising:
determining an original area of an initial Zip file; the original area comprises an original data area, an original central recording area and an original tail area;
generating a target area for modifying the initial Zip file according to the original area;
and generating a target Zip file according to the original area and the target area.
2. The method of claim 1, wherein generating a target area for modifying a Zip file from the original area comprises:
determining area information of the original area; wherein the area information includes current data of the original central recording area, a data format of the original data area, and a file size of the initial Zip file;
and generating a target area for modifying the Zip file according to the area information.
3. The method of claim 2, wherein generating a target area for modifying the Zip file based on the area information comprises:
generating an additional data area, a new central recording area and a new tail area according to the area information;
and determining a target area for modifying the Zip file according to the additional data area, the new central recording area and the new tail area.
4. The method of claim 3, wherein the generating the additional data area, the new central recording area, and the new tail area according to the area information comprises:
generating the additional data area according to the data format of the original data area;
generating a blank central recording area and a blank tail area;
copying the current data of the original central recording area to the blank central recording area to generate the new central recording area;
and saving the file size of the initial Zip file to the blank tail area to generate the new tail area.
5. The method of claim 1, wherein generating a target Zip file from the original region and the target region comprises:
and based on a file append mechanism, the target area is appended to the tail of the original area so as to generate the target Zip file.
6. The method of claim 1, wherein after generating a target Zip file from the original region and the target region, further comprising:
and verifying the target Zip file based on a preset file verification method.
7. The method as recited in claim 6, further comprising:
if the verification is passed, determining that the target Zip file is normal;
if the verification is not passed, performing anomaly detection on the target Zip file.
8. A device for modifying a Zip file, comprising:
the original area determining module is used for determining an original area of the initial Zip file; the original area comprises an original data area, an original central recording area and an original tail area;
the target area determining module is used for generating a target area for modifying the initial Zip file according to the original area;
and the file generation module is used for generating a target Zip file according to the original area and the target area.
9. An electronic device, comprising:
one or more processors;
a memory for storing one or more programs;
the one or more programs, when executed by the one or more processors, cause the one or more processors to implement the method of modifying a Zip file as claimed in any of claims 1-7.
10. A computer readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, implements a method of modifying a Zip file according to any of claims 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311152631.0A CN117194343A (en) | 2023-09-07 | 2023-09-07 | Zip file modification method, device, equipment and storage medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202311152631.0A CN117194343A (en) | 2023-09-07 | 2023-09-07 | Zip file modification method, device, equipment and storage medium |
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| CN117194343A true CN117194343A (en) | 2023-12-08 |
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|---|---|---|---|
| CN202311152631.0A Pending CN117194343A (en) | 2023-09-07 | 2023-09-07 | Zip file modification method, device, equipment and storage medium |
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| CN (1) | CN117194343A (en) |
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- 2023-09-07 CN CN202311152631.0A patent/CN117194343A/en active Pending
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