| 摘要 |
PURPOSE:To compress the part of a file of the same value and reduce the size of successive data records when the file of the same value is present between the successive data records in a data file. CONSTITUTION:It is checked whether or not there is the same character string consisting of >=2 characters at the same place with the last data record D1 in a data record D2, and when there is the same character string, control characters (3) indicating vertical compression and the number '13' of the successive characters are substituted for the part c to compress it like the data record E2. When the data record E2 is expanded, the part from the character '9' of the last data record D1 present at the same place as the control character (3) to the character '1' at a distance of the number '13' of successive characters is replaced by the part c', thereby restoring the data record D2. |
