KR20060099304A - Method for writing file of mobile communication terminal - Google Patents

Abstract

The present invention relates to a file recording method of a mobile communication terminal to prevent an abnormal file from being recorded in an EFS area. The file size is allocated by comparing the size of a file to be recorded and the allocated EFS size according to a file recording command. Determining whether it is smaller than the size of the EFS; If the size of the file is larger than the allocated EFS size, the determination result may include outputting an error message to block writing of the file.

EFS area, master file directory, file size

Description

File recording method of mobile terminal {METHOD FOR WRITING FILE OF MOBILE COMMUNICATION TERMINAL}

1 schematically shows the main elements that are updated when writing a file in an EFS area;

2 is a flowchart illustrating a file recording method of a mobile communication terminal according to an embodiment of the present invention.

The present invention relates to a file recording method of a mobile communication terminal, and more particularly, to a file recording method of a mobile communication terminal so that an abnormal file cannot be recorded in an EFS area.

Conventionally, when recording a file in the EFS (Embedded File System) area of the mobile communication terminal, the file is unconditionally recorded regardless of the EFS size allocated to each model.

That is, when recording a file in the EFS, even if a file larger than the EFS size is included by a user (S / W programmer) mistake, the EFS unconditionally executes the recording.

As described above, when a file exceeding the allocated EFS size is recorded in the EFS or the file size increases due to an internal coding error, the EFS no longer has space to allocate. There is a problem that the EFS error occurs because there is no more space to allocate all the tables that store all the information about all the files stored in the EFS, causing a continuous reset.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and if a single file is larger than the EFS quota, the recording itself is prevented, and if several files are written and larger than the EFS quota, the last recorded file is deleted and moved. It is an object of the present invention to provide a file recording method of a mobile communication terminal that allows a communication terminal to perform a normal operation.

According to an aspect of the present invention, there is provided a file recording method of a mobile communication terminal, the size of the file being allocated by comparing the size of the file to be recorded with the allocated EFS size according to a file recording command. Determining whether it is smaller than the EFS size; If the size of the file is larger than the allocated EFS size, the determination result may include outputting an error message to block writing of the file.

Further, if the size of the file is smaller than the allocated EFS size as a result of the determination, a block (dirfrex) in which the file is to be written and a name (dirnamx) to be used for indexing are allocated, and the location of the block is assigned to a hash table (dirbukx). ) In addition to; Add an entry to the master file directory for indexing the allocated block (dirfrex) and name (dirnamx) and the location of the updated block, and link the table (fbl_pool) that stores the entry and all information about the file. Making a process; Determining whether the table (fbl_pool) is full and there are no more memory areas to allocate; If the table fbl_pool is full and there is no more memory area to allocate, the files associated with the file are extracted to determine the names of the blocks and the names allocated to the extracted files. Canceling the allocation, deleting the location of the block in which the files are written in the hash table (dirbukx), and deleting the entries of the files in the master file directory; The method may further include updating the sector state table by resetting the extracted files from the valid file to the invalid file with reference to the master file directory and the table fbl_pool, and resetting the mobile communication terminal.

When the memory area to be allocated remains as a result of the determination, the method may further include processing various commands for file writing and updating each item.

Hereinafter, a file recording method of a mobile communication terminal according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic diagram showing the main elements updated when a file is written to an EFS area. EFS has a RAM-resident table for efficient memory management. Manage by classifying.

In other words, when writing files to EFS, the master file directory, fbl_pool, dirnamx, dirfrex, dirbukx and the sector status table are updated to be used for file management.

As mentioned above, fbl_pool stores all information about all files stored in EFS, the master file directory manages fbl_pool, and dirnamx, dirfrex, and dirbukx provide the parameters required for the master file directory to manage fbl_pool. For example, dirnamx stores files in order of name, dirfrex stores information about blocks that are not being used in EFS, dirbukx stores hash tables for file indexing, and sector state tables for valid files and invalidation. It stores one file separately.

2 is a flowchart illustrating a file recording method of a mobile communication terminal according to an embodiment of the present invention.

First, if a command to write a file in the EFS area is authorized (S10), the size of the file to be written is smaller than the allocated EFS size by comparing the size of the file to be recorded in the EFS area with the allocated EFS size according to the file writing command. It is determined (S12).

If the size of the file to be recorded in the EFS area is larger than the allocated EFS size as a result of the determination in step S12, an error message is output to block the file from being written to the EFS (S14).

On the other hand, if the size of the file to be recorded in the EFS area is a plurality of files smaller than the allocated EFS size as a result of the determination of step S12, allocate a block (dirfrex) to be recorded in the empty block, and indexing The name (dirnamx) to be used is allocated, and the location of the block in which the file is recorded is added to the hash table (dirbukx) and updated (S16).

Subsequently, an entry for indexing dirfrex and dirnamx and the updated dirbukx allocated in the above-described process S16 is added to the master file directory and updated, and the entry added to the master file directory and all information about the file are stored. Link fbl_pool (S18).

Subsequently, it is determined that the fbl_pool is full and there is no more memory area to allocate (S20). When the memory area to be allocated remains, the controller processes various commands for file recording, updates each item, and then records the file normally. The process ends (S22).

On the other hand, if the fbl_pool is full as a result of the determination of step S20 and there is no more memory area to allocate, the file associated with the file recorded in the EFS area is extracted and invalidated according to the file writing command of step S10 (step S10). S24), deassigning the blocks (dirfrex) and names (dirnamx) assigned to the files invalidated in the above-described process S24, and deleting the positions of the blocks where the files are recorded in the hash table (dirbukx). In operation S26, entries of the corresponding files are deleted from the master file directory.

In step S26, as the entries of the corresponding files are deleted from the master file directory, the link between the entry and the fbl_pool is also broken.

Thereafter, by referring to the master file directory and fbl_pool, the files extracted in step S are changed from a valid file to an invalid file, thereby updating the sector state table (S28), and fbl_pool is full and the mobile communication terminal cannot operate normally. By resetting the normal operation of the mobile communication terminal (S30).

The file recording method of the mobile communication terminal of the present invention is not limited to the above-described embodiments, and can be modified in various ways within the scope of the technical idea of the present invention.

According to the file recording method of the mobile communication terminal of the present invention as described above, if a single file is larger than the EFS quota, the recording itself cannot be blocked, and several files smaller than the EFS quota are recorded and larger than the EFS quota. If so, the last recorded file is deleted, thereby allowing the mobile communication terminal to perform its normal operation.

Claims (3)

Comparing the size of the file to be recorded with the allocated EFS size according to a file writing command to determine whether the size of the file is smaller than the allocated EFS size; And if the file size is larger than the allocated EFS size as a result of the determination, outputting an error message to block recording of the file. The method of claim 1, wherein if the size of the file is smaller than the allocated EFS size, the file is allocated a block to which the file is to be written and a name to be used for indexing, and the location of the block is determined. Adding to a hash table dirbukx; Add an entry to the master file directory for indexing the allocated block (dirfrex) and name (dirnamx) and the location of the updated block, and link the table (fbl_pool) that stores the entry and all information about the file. Making a process; Determining whether the table (fbl_pool) is full and there are no more memory areas to allocate; If the table fbl_pool is full and there is no more memory area to allocate, the files associated with the file are extracted to determine the names of the blocks and the names allocated to the extracted files. Canceling the allocation, deleting the location of the block in which the files are recorded in the hash table (dirbukx), and deleting the entries of the files in the master file directory; And updating the sector status table by changing the extracted files from a valid file to an invalid file with reference to the master file directory and the table fbl_pool, and resetting the mobile communication terminal. File recording method of communication terminal. The file recording of the mobile communication terminal according to claim 2, further comprising the step of processing various commands for file recording and updating each item when the memory area to be allocated remains as a result of the determination. Way.

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