Method and system for storing large data files

• US 7,743,080 B2
• Filed: 01/09/2007
• Issued: 06/22/2010
• Est. Priority Date: 08/15/2001
• Status: Expired due to Term

• Current Assignee: Bentley Systems Incorporated
• Original Assignee: Bentley Systems Incorporated
• Inventors: Bentley, Keith
• Primary Examiner(s): Le; Miranda
• Application Number:
  US11/651,057
• Publication Number:
  US 20070192376A1
• Time in Patent Office: 1,260 Days
• Field of Search: 707/1, 707100-101, 707/102, 707/104.1, 707/200, 707/821, 707/828, 707/829, 707/999.2, 707/999.101, 707/999.102
• US Class Current: 707/821
• CPC Class Codes: G06F 16/10 File systems; File servers
• CPC Class Codes: Y10S 707/99942 Manipulating data structure, e.g. compression, compaction, compilation
• CPC Class Codes: Y10S 707/99943 Generating database or data structure, e.g. via user interface

Abstract

An enhanced file format to store large quantities of variable-sized data records on a storage medium and to permit efficient access and control over data stored in the enhanced file format. A file format is the structure of a file that defines the way it is stored and laid out on a disk. In a preferred embodiment of the present invention, a file format includes a model directory containing models. Models include element lists comprising element chunks. The element chunks include elements, where elements are variable-sized data records.

Claims

1. A method in a computer system for modifying at least one compressed element chunk in

a main storage area, comprising:

storing at least one root storage in the main storage area;

storing a model directory in said at least one root storage;

storing at least one model including a graphic element list and a control element list in each model directory;

storing at least one compressed element chunk in each graphic element list and control element list, wherein each said compressed element chunk comprises compressed elements;

storing said at least one root storage in a temporary memory;

storing in said at least one of root storage a control model containing a control model header, a global control element list and a global graphic element list, wherein said global control element list and said global graphic element list contain element chunks including global elements, wherein said global elements are accessed for use in any model directory;

associating a header with each root storage;

storing in said at least one root storage at least one of a first stream containing a header, a second stream containing session information, a third stream containing a manifest and a fourth stream containing file properties;

decompressing said compressed element chunks and compressed elements in said graphic element list and said control element list;

modifying elements in the temporary memory;

flagging said decompressed element chunks having said modified elements in said temporary memory with a dirty flag;

compressing said flagged element chunks to provide modified compressed element chunks after a predetermined idle time has passed; and

replacing said compressed element chunks in the main storage area with said modified compressed element chunks.

2. The method as in claim 1, wherein the computer system comprises a first workstation having said temporary memory, wherein said first work station accesses and modifies elements;

and at least a second workstation accesses and views said modified elements upon request.

3. The method of claim 1, wherein the computer system is the Internet.

4. The method of claim 1, wherein the computer system is an Intranet.

5. The method of claim 1, wherein the computer system is a local area network.

6. The method of claim 1, wherein said main storage area is a file.

7. The method of claim 1, wherein at least one of said root storages is adapted to be operable with a computer aided design program.

8. The method of claim 1, wherein each said root storage is a file.

9. The method of claim 1, further comprising the step of associating at least one of a stream and a storage, neither of which are contained in the model directory, with at least one of the root storages.

10. The method of claim 1, further comprising the step of storing in said at least one root storage at least one of a first stream containing a header, a second stream containing session information, a third stream containing a manifest and a fourth stream containing file properties.

11. A computer system for modifying at least one compressed chunk of elements stored in a main storage area, comprising:

a temporary memory;

a root storage stored in the main storage area and the temporary memory;

a model directory stored in the root storage;

at least one model stored in the model directory;

at least one graphic element list stored in each model;

at least one control element list stored in each model;

a control model containing a control model header, a global control element list and a global graphic element list stored in root storage, wherein said global control element list and said global graphic element list contain element chunks including global elements, wherein said global elements are accessed for use in any model directory;

at least one compressed element chunk stored in each graphic element list and control element list, wherein each element chunk comprises compressed elements;

means for associating a header with each root storage;

means for storing in said at least one root storage at least one of a first stream containing a header, a second stream containing session information, a third stream containing a manifest and a fourth stream containing file properties;

means for decompressing the element chunks and elements in the graphic element list and control element list in the temporary memory;

means for modifying elements in the temporary memory;

means for flagging the element chunks having the modified elements in the temporary memory;

means for compressing the element chunks having the modified elements in temporary memory to provide modified compressed element chunks after a predetermined idle time has passed; and

means for replacing the compressed element chunks in the main storage area with the modified compressed element chunks.

12. The computer system as in claim 11, further comprising a first workstation having the temporary memory, wherein the first work station modifies elements;

and at least a second workstation accesses and views the modified elements upon request.

13. The computer system as in claim 11, wherein the computer system is the Internet.

14. The computer system as in claim 11, wherein the computer system is an Intranet.

15. The computer system as in claim 11, wherein the computer system is a local area network.

16. The computer system as in claim 11, wherein the main storage area is a file.

17. The computer system as in claim 11, wherein at least one of the root storages is adapted to be operable with a computer aided design program.

18. The computer system as in claim 11, wherein each root storage is a file.

19. The computer system as in claim 11, further comprising means for associating at least one of a stream and storage, which are not contained in the model directory, with at least one of the root storages.