ANSI ISO IEC-22091-2002 pdf download Information technology — Streaming Lossless Data Compression algorithm (SLDC)
1 Scope
This International Standard specifies a lossless compression algorithm to reduce the number of 8-bit bytes required to represent data records and File Marks. The algorithm is known as Streaming Lossless Data Compression algorithm (SLDC). One buffer size (1 024 bytes) is specified. The numerical identifier according to ISO/IEC 11576 allocated to this algorithm is 6.
2 Conformance
A compression algorithm shall be in conformance with this International Standard if its Encoded Data Stream satisfies the requirements of this International Standard.
3 Normative reference
The following normative document contains provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative document indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards.
ISO/IEC 11576:1994 Information technology — Procedure for the registration of algorithms for the lossless compression of data
4 Terms and definitions
For the purpose of this International Standard the following terms and definitions apply.
4.1 Access Point
A location in the Encoded Data Stream at which data may be decoded.
4.2 Control Symbol
A Control Symbol may change the compression scheme, reset the History Buffer, mark the end of a Record, indicate a File Mark, or indicate the termination of an Encoded Data Stream.
4.3 Copy Pointer
A part of the Encoded Data Stream output in scheme 1 that replaces a string of data bytes with a specification of a Matching String.
4.4 data byte
An element of user data that is to be encoded.
4.5 Data Symbol
An element of an Encoded Record that represents one or more data bytes.
4.6 Displacement Field
A field in the Copy Pointer that specifies the location within the History Buffer of the first byte of a Matching String.
4.7 Encoded Data Stream
The output stream after encoding User Data.
4.8 Encoded Record
The output stream after encoding one Record of user data.