JPS62288969A - Compressed document data processor - Google Patents

Abstract

PURPOSE:To quickly control a picture for page switching of document information by providing a page designation table and holding document information, which is edited once up to the current page, and head position information of each page in the table. CONSTITUTION:A page designation table 20 is provided with a two-byte area for a head page number A and a three-byte register area for every page, and a two-byte pointer B1... to the text head position in the document information storage part 21 of each page and the one-byte settled frame number C1... of the page are stored in each register area. A frame provided in document information is discriminated by the frame number. The head page number A is the head page number of the pointer held in the table 20. If a changed page is already registered in the table 20, the position of the changed page is read out from the table 20 to directly determine a text position by a text position determining part 17, and virtual editing is unnecessary. If the changed page cannot be obtained from the table, page position information is set and registered in the table simultaneously with virtual editing. Thus, the overhead related to the setting processing of the table 20 is scarcely generated to keep the processing speed approximating conventional that.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention [Summary] In a compressed document data processing device that compresses and manages document data, a page pointer table is provided, and a page pointer table is provided with a page pointer table. By retaining information on the top position of each page of document data/text up to the current page, screen control when switching between pages of one document data can be speeded up.

[Industrial application field]

The present invention relates to a document data processing apparatus such as a word processor, and more particularly to a compressed document data processing apparatus that speeds up screen control when switching between pages of compressed and managed document data.

[Conventional technology]

In document data processing devices such as word processors.

Text is managed on a page-by-page basis using a predetermined number of characters per line and a predetermined number of lines per page. In the case of a processing device that stores and holds document data without compressing it, the number of characters in one line and one page is fixed, so a blank code or the like is embedded after a line feed code, page feed code, etc., for example. Therefore, the storage area is wasted for invalid data such as blank spaces.

Therefore, in order to save the storage area for recording two document data, a compressed document data processing device is used which compresses and manages nine document data.

With conventional compression type document data processing devices, the starting position of each page cannot be known unless the compressed and stored document data is decompressed and restored to its original state. When there is an instruction to change a page that is currently in use, virtual editing is performed to sequentially expand two document data from the beginning of one document data, and the document data/text of the specified page is obtained.

[Problem that the invention seeks to solve]

According to the above conventional method, virtual editing is always performed from the beginning of document data when switching pages, etc., so as the amount of data increases, the speed at which document data that is subject to one edit is displayed on the display becomes slower. There is a problem with becoming.

However, if you obtain the start position information of all pages in advance and store the start position of the page in a table, if three characters are added or deleted on an intermediate page, the table will be updated. However, there is a problem in that the overhead required to always keep it up to date is large.

The present invention aims to solve the above problems by reducing the amount of data to be virtually edited when switching pages.

The purpose is to provide a means to speed up screen control.

[Means for solving problems]

FIG. 1 shows an example of the basic configuration of the present invention.

In FIG. 1, 10 is a human powered device such as a keyboard device,
11 is a processing unit consisting of a CPU and memory; 12 is a C
Display devices such as RT displays.

13 is an input control unit that controls input from the input device 10;
14 is a document data editing section that edits document data while displaying it on the display device 12, and 15 is a page switching control section that controls switching of display pages.

16 is a changed page determination unit that compares the size of the page whose display is to be changed and the current page; 17 is a text position determination unit that determines the text position of the page to be changed; and 18 is a page pointer table that performs virtual editing of document data. a page pointer table setting unit for registering pointers to; 19;
20 is a document data compression/expansion unit that performs compression/expansion processing on document data; 20 is a page pointer table that stores information on the top position of each page of document data/text;

Reference numeral 21 represents a document data storage unit that stores compressed document data, and 22 represents a display control unit that performs display control on the display device 12.

In the case of the present invention, a page pointer table 20 is provided, and one document data storage section 2 is provided in the page pointer table 20.
Information on the top position of each page of document data/text once edited in 1 is registered.

In response to a page switching instruction, via the input control unit 13,
When the page switching control unit 15 is activated.

The page switching control unit 15 calls the changed page determination unit 16. The changed page determination unit 16 calls the text position determination unit 17 when the changed page is not larger than the currently displayed page and the position information of the changed page is registered in the page pointer table 20. In other cases, the page pointer table setting section 18
call.

The text position determination unit 17 uses the page pointer table 2
By referring to 0, the position information of the changed page is obtained. The document data compression/expansion section 19.

1 document data storage unit 2 according to the position information of the changed page.
Read the text of that page from 1.

The document data is decompressed and passed through the 1 display control unit 22.

It is displayed on the display device 12. From now on, about that page 2
This means that document data can be processed.

The page pointer table setting unit 18 performs virtual editing from the first page of the two document data/texts or the currently displayed page to the changed page, and each time the page changes, the page pointer table 20 stores the document data/text. Executes the process of registering the top position information of each page. When processing up to the changed page is completed, 2. By the document data compression/expansion section 19, 1. Via the display control section 22.

The change page is displayed on the display device 12. In addition.

Virtual editing is performed without displaying on one display device 12.

This is an editing process that decompresses one document data only internally.

[Effect]

In the case of compressed document data/text, when data is entered or deleted, the subsequent text is

Because the top position of the page shifts, past information cannot be guaranteed. However, for the text that precedes the input or deletion location, the top position of each page does not change. The present invention has been developed with this point in mind, and by managing the pointers of once edited pages using the page pointer table 20, it is possible to increase the processing speed.

According to the present invention, if the changed page has already been registered in the page pointer table 20, the position information of the changed page is read from the page pointer table 20, and the text position is directly determined by the text position determination unit 17. Since the information is determined, there is no need for virtual editing of intermediate pages.

If the changed page cannot be obtained from the page pointer table 2o, virtual editing up to the changed page is performed as in the conventional case. At this time, the page pointer table 20
Since the page location information settings are registered at the same time,
What is the overhead associated with the process of setting the page pointer table 20?

For the most part, processing speeds are maintained at the same level as before.

〔Example〕

FIG. 2 is an explanatory diagram of a page pointer table according to an embodiment of the present invention, and FIG. 3 is an explanatory diagram of processing in one embodiment of the present invention.

The page pointer table 20 is configured, for example, as shown in FIG. The page pointer table 20 is provided with a 2-byte area for the first page number A and a 3-byte registration area for each page. In the registration area corresponding to this page.

A 2-byte pointer Bn to the start position of the text in the document data storage section 21 of each page and a 1-byte fixed frame number Cn for the page are set. The frame number is
This is an identification number of a frame provided in two-document data as a display area for graphs, line drawings, images, etc.

For example, as a page pointer table 20.

A 302-byte area is prepared. In this case, pointer information for 100 pages can be managed. When the processing page exceeds the 00th page, information is erased in order from the first page. The first page number A is the first page number of the pointer held by the page pointer table 20.

For example, if the number of the changed page is n.

r (n-A)X3+2J is page pointer table 2
This is the relative address of the pointer storage location at 0.

By the way, when trying to manage pointers for all pages using the page pointer table 20, the size of the required table depends on the number of pages, so if the number of pages increases due to restrictions on the size of the table area. There is a risk that the table will overflow. In this example.

Since the first page number A allows pointer management from intermediate pages, such a problem does not occur.

Next, processing according to an embodiment of the present invention will be described with reference to FIG. The numbers ■~@ in the following explanation correspond to the process numbers ■~@ shown in FIG.

■ When there is an instruction to change the displayed page, the size of the page to be changed is compared with the currently displayed page.

If the changed page is larger than the current page, control is transferred to process ■.

(2) Obtain the first page number set at the beginning of the page pointer table 20.

■ Compare the size of the changed page and the first page number obtained in process ■. If the first page number is large, control is transferred to process ■.

(2) Read the pointer of the changed page, that is, the text start position information in the document data storage unit 21 of the changed page from the page pointer table 20;

■ The document data/text related to the changed page is 9
Read from the document data storage section 21.

Edit to expand the data.

■ Display the edited text of the changed page on the display device 12, and end the page switching.

■ In the judgment of process ■, if it is detected that the first page number is large, the current page is initialized to "1",
Process ■ Execute the following steps.

■ Set the current page information, and then perform virtual editing from the current page to the changed page as follows.

(2) Virtually edit one line of text read from the document data storage unit 21 and insert information on the first line.

[Phase] Determine whether the page has changed. The page changes when the number of lines for one page is counted or when a page break code is detected. If the page does not change, control is returned to process (9) and virtual editing etc. are performed in the same manner for the next line.

■ If the page changes, page pointer table 2
Set the pointer to the page that changed to 0 and the fixed frame number.

■ Determine whether virtual editing has been performed up to the changed page. If the virtual editing up to the changed page has not yet been completed, control is returned to process (2) and the process is repeated in the same manner. When virtual editing is finished.

Control is transferred to process 2, and the edit 1 display of the change page is performed.

〔Effect of the invention〕

As explained above, according to the second aspect of the present invention, when editing a page before the page currently being processed.

Editing and display processing can be performed at high speed regardless of the amount of document data.

[Brief explanation of drawings]

FIG. 1 is an example of the basic configuration of the present invention, and FIG. 2 is an explanatory diagram of a page pointer table according to an embodiment of the present invention. FIG. 3 shows a processing explanatory diagram of an embodiment of the present invention. In the figure, 10 is an input device, 11 is a processing device, 12 is a display device, 13 is a human control section, 14 is a document data editing section, 15
16 is a page switching control unit, 16 is a change page determination unit, and 17 is a page switching control unit.
18 is a text position determining section, 18 is a page pointer table setting section, 19 is a document data compression/expansion section, 20 is a page pointer table, 21 is a document data storage section, and 22 is a display control section.

Claims (1)

[Claims] Comprising a display device (12) for displaying document data, and a document data storage section (21) for storing compressed document data from which invalid data has been removed, the document data is displayed on the display device (12).
In the document data processing device that creates and edits the text of a document while displaying it on the document data storage section (12), the document data storage section (
A page pointer table (20) in which information on the top position of each page of document data/text is stored in step 21); When the page position information is registered in the page pointer table (20), a text position determination unit (17) obtains the position information of the changed page from the page pointer table (20) and determines the text position. In response to an instruction to change the displayed page, if the position information of the changed page is not registered in the page pointer table (20), virtual editing is performed from the first page or the currently displayed page to the changed page, A compressed document data processing device comprising: a page pointer table setting unit (18) for registering information on the top position of each page of virtually edited document data/text in the page pointer table (20).