ANSI-INCITS-241-1994-R2004.pdf
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1、ANSI INCITS 241-1994 (R1999) (formerly ANSI X3.241-1994 (R1999) for Information Systems Data Compression Method Adaptive Coding with Sliding Window for Information Interchange Copyright American National Standards Institute Provided by IHS under license with ANSI Licensee=USN Ship Repair Facility Yo
2、kosuka/9961031100 Not for Resale, 05/09/2007 00:48:51 MDTNo reproduction or networking permitted without license from IHS -,-,- American National Standard Approval of an American National Standard requires review by ANSI that the requirements for due process, consensus, and other criteria for approv
3、al have been met by the standards developer. Consensus is established when, in the judgment of the ANSI Board of Standards Review, substantial agreement has been reached by directly and materially affected interests. Substantial agreement means much more than a simple majority, but not necessarily u
4、nanimity. Consensus requires that all views and objections be considered, and that a concerted effort be made toward their resolution. The use of American National Standards is completely voluntary; their existence does not in any respect preclude anyone, whether he has approved the standards or not
5、, from manufacturing, marketing, purchasing, or using products, processes, or procedures not conforming to the standards. The American National Standards Institute does not develop standards and will in no circumstances give an interpretation of any American National Standard. Moreover, no person sh
6、all have the right or authority to issue an interpretation of an American National Standard in the name of the American National Standards Institute. Requests for interpretations should be addressed to the secretariat or sponsor whose name appears on the title page of this standard. CAUTION NOTICE:
7、This American National Standard may be revised or withdrawn at any time. The procedures of the American National Standards Institute require that action be taken periodically to reaffirm, revise, or withdraw this standard. Purchasers of American National Standards may receive current information on
8、all standards by calling or writing the American National Standards Institute. CAUTION: The developers of this standard have requested that holders of patents that may be required for the implementation of the standard disclose such patents to the publisher. However, neither the developers nor the p
9、ublisher have undertaken a patent search in order to identify which, if any, patents may apply to this standard. As of the date of publication of this standard, following calls for the identification of patents that may be required for the implementation of the standard, notice of one or more such c
10、laims has been received. By publication of this standard, no position is taken with respect to the validity of this claim or of any rights in connection therewith. The known patent holder(s) has (have), however, filed a statement of willingness to grant a license under these rights on reasonable and
11、 nondiscriminatory terms and conditions to applicants desiring to obtain such a license. Details may be obtained from the publisher. No further patent search is conducted by the developer or publisher in respect to any standard it processes. No representation is made or implied that this is the only
12、 license that may be required to avoid infringement in the use of this standard. Published by American National Standards Institute 11 West 42nd Street, New York, New York 10036 Copyright 1994 by Information Technology Industry Council (ITI) All rights reserved. No part of this publication may be re
13、produced in any form, in an electronic retrieval system or otherwise, without prior written permission of ITI, 1250 Eye Street NW, Washington, DC 20005. Printed in the United States of America Copyright American National Standards Institute Provided by IHS under license with ANSI Licensee=USN Ship R
14、epair Facility Yokosuka/9961031100 Not for Resale, 05/09/2007 00:48:51 MDTNo reproduction or networking permitted without license from IHS -,-,- ANSI X3.241-1994 American National Standard for Information Systems Data Compression Method Adaptive Coding with Sliding Window for Information Interchange
15、 Secretariat Computer and Business Equipment Manufacturers Association Approved August 30, 1994 American National Standards Institute, Inc. Copyright American National Standards Institute Provided by IHS under license with ANSI Licensee=USN Ship Repair Facility Yokosuka/9961031100 Not for Resale, 05
16、/09/2007 00:48:51 MDTNo reproduction or networking permitted without license from IHS -,-,- ii Contents Page Forewordii 1 Scope and conformance 1 2 Normative references.1 3 Definitions.1 4 Algorithm identifier.1 5 Data format .2 Annexes AEncoding overview.5 B Example compression encoding method.8 Co
17、pyright American National Standards Institute Provided by IHS under license with ANSI Licensee=USN Ship Repair Facility Yokosuka/9961031100 Not for Resale, 05/09/2007 00:48:51 MDTNo reproduction or networking permitted without license from IHS -,-,- iii Foreword (This foreword is not part of America
18、n National Standard X3.241-1994.) This standard specifies a lossless data compression method that is intended for general purposes. It contains features that make it particularly applicable to systems for recording information on interchangeable media. This standard was developed by Technical Commit
19、tee X3B5, by X3 project 882. The first draft was produced in November 1991. The second draft was produced in March 1992. There are two annexes in this standard. Both are informative and are not considered part of this standard. Requests for interpretation, suggestions for improvement or addenda, or
20、defect reports are welcome. They should be sent to the X3 Secretariat, Computer and Business Equipment Manufacturers Association, 1250 Eye Street NW, Suite 200, Washington, DC 20005. This standard was processed and approved for submittal to ANSI by the Accredited Standards Committee on Information P
21、rocessing Systems, X3. Committee approval of this standard does not necessarily imply that all committee members voted for its approval. At the time it approved this standard, the X3 Committee had the following members: James D. Converse, Chair Donald C. Loughry, Vice-Chair Joanne Flanagan, Secretar
22、y Organization RepresentedName of Representative American Nuclear SocietyGeraldine C. Main Sally Hartzell (Alt.) AMP, IncEdward Kelly Charles Brill (Alt.) Apple Computer, Inc. .Karen Higginbottom David K. Michael (Alt.) AT an offset field (described in 5.5); a length field (described in 5.6). 5.5 Of
23、fset field The offset field of a string token is a variable- length bit pattern that represents the distance 5 Data format 5.1 Overview The data compression encoding method is designed to support an adaptive string com- pression algorithm that can find redundant multiple byte patterns in the input d
24、ata stream and replace them with shorter tokens in the compressed output data stream. The output data stream alone may be used to reconstruct the original input stream completely and exactly. 5.2 Principle of operation The input data stream and the output data stream shall consist of a stream of byt
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