CA2007168A1 - Variable length string matcher - Google Patents

Variable length string matcher

Info

Publication number
CA2007168A1
CA2007168A1 CA2007168A CA2007168A CA2007168A1 CA 2007168 A1 CA2007168 A1 CA 2007168A1 CA 2007168 A CA2007168 A CA 2007168A CA 2007168 A CA2007168 A CA 2007168A CA 2007168 A1 CA2007168 A1 CA 2007168A1
Authority
CA
Canada
Prior art keywords
variable length
length string
string matcher
matcher
string
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA2007168A
Other languages
French (fr)
Other versions
CA2007168C (en
Inventor
Brian Ta-Cheng Hou
Craig D. Cohen
James A. Pasco-Anderson
Michael Gutman
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
General Electric Co
Original Assignee
Codex Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Codex Corp filed Critical Codex Corp
Publication of CA2007168A1 publication Critical patent/CA2007168A1/en
Application granted granted Critical
Publication of CA2007168C publication Critical patent/CA2007168C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
    • H03M7/00—Conversion of a code where information is represented by a given sequence or number of digits to a code where the same, similar or subset of information is represented by a different sequence or number of digits
    • H03M7/30—Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction
    • H03M7/3084—Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction using adaptive string matching, e.g. the Lempel-Ziv method
    • H03M7/3086—Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction using adaptive string matching, e.g. the Lempel-Ziv method employing a sliding window, e.g. LZ77
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
    • G06F16/90—Details of database functions independent of the retrieved data types
    • G06F16/903—Querying
    • G06F16/90335—Query processing
    • G06F16/90339—Query processing by using parallel associative memories or content-addressable memories
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
    • G06F16/90—Details of database functions independent of the retrieved data types
    • G06F16/903—Querying
    • G06F16/90335—Query processing
    • G06F16/90344—Query processing by using string matching techniques
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F7/00—Methods or arrangements for processing data by operating upon the order or content of the data handled
    • G06F7/02—Comparing digital values
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T9/00—Image coding
    • G06T9/005—Statistical coding, e.g. Huffman, run length coding
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C15/00—Digital stores in which information comprising one or more characteristic parts is written into the store and in which information is read-out by searching for one or more of these characteristic parts, i.e. associative or content-addressed stores
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2207/00—Indexing scheme relating to methods or arrangements for processing data by operating upon the order or content of the data handled
    • G06F2207/02—Indexing scheme relating to groups G06F7/02 - G06F7/026
    • G06F2207/025—String search, i.e. pattern matching, e.g. find identical word or best match in a string
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S707/00—Data processing: database and file management or data structures
    • Y10S707/99931—Database or file accessing
    • Y10S707/99933—Query processing, i.e. searching
    • Y10S707/99936—Pattern matching access

Abstract

A variable length string matcher uses absolute addressing of a history buffers the longest matching string is determined by an associative content addressable memory.
CA002007168A 1989-01-23 1990-01-04 Variable length string matcher Expired - Lifetime CA2007168C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US29975989A 1989-01-23 1989-01-23
US299,759 1989-01-23

Publications (2)

Publication Number Publication Date
CA2007168A1 true CA2007168A1 (en) 1990-07-23
CA2007168C CA2007168C (en) 1999-12-14

Family

ID=23156170

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002007168A Expired - Lifetime CA2007168C (en) 1989-01-23 1990-01-04 Variable length string matcher

Country Status (8)

Country Link
US (1) US5329405A (en)
EP (1) EP0380294B1 (en)
JP (1) JP2830280B2 (en)
AT (1) ATE152260T1 (en)
AU (1) AU624205B2 (en)
CA (1) CA2007168C (en)
DE (1) DE69030519D1 (en)
HK (1) HK1009317A1 (en)

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Also Published As

Publication number Publication date
AU4704089A (en) 1990-07-26
DE69030519D1 (en) 1997-05-28
EP0380294A1 (en) 1990-08-01
ATE152260T1 (en) 1997-05-15
AU624205B2 (en) 1992-06-04
JP2830280B2 (en) 1998-12-02
HK1009317A1 (en) 1999-05-28
US5329405A (en) 1994-07-12
EP0380294B1 (en) 1997-04-23
JPH02233025A (en) 1990-09-14
CA2007168C (en) 1999-12-14

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