Encoding variable length and null data while preserving sort seq

Details Encoding variable length and null data while preserving sort seq Encoding variable length and null data while preserving sort seq

1988-11-03

1991-03-19

Shoop, Jr., William M.

Coded data generation or conversion

Digital code to digital code converters

341 67, 341 90, H03M 700, H03M 740

Patent

active

050014773

ABSTRACT:
A method of encoding data records comprised of null or variable length fields of data bytes such that the sortabilty of the resulting string of data is permitted via simple byte comparisons. The first field is examined to determine if it is a null field. A null field is a field containing no data. It should sort out before a field containing any data, even all zeros. If a null field is detected, it is represented in the encoded string of data by a null field indicator. If the field is not a null field, the bytes in the field are examined. Zero value bytes are encoded based on the number of consecutive zero value bytes while non-zero bytes remain unchanged. An end of field indicator designates the end of each field in the resulting string of encoded data.

REFERENCES:
patent: 4645916 (1987-02-01), Raisleger
IBM Technical Disclosure Bulletin, vol. 19, No. 9, Feb., 1977, "Multifield Encoding for Unrestricted Strings"; Blasgen, et al., pp. 3582-3583.

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