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- December 15, 1991
-
- Whats new in DFL version 3.11 since version 3.02:
-
- 1. W.S.Ataras Engineering is a member of the Association of Shareware
- Professionals (ASP). ASP wants to make sure that the shareware principle
- works for you. This software conforms to ASP standards.
- 2. The shareware version of DFL no longer has archive support disabled. The
- only difference between the shareware and registered versions of DFL are a
- startup and exit registration reminder screen. All functions are enabled.
- 3. Registered users receive a printed manual.
- 4. DFL now directly accesses recognizable archive file formats. Currently,
- only the ZIP format is recognized. If an archive format is unrecognized or
- the author changes it, DFL will revert to indirect access. In other words,
- DFL is still able to access all archives, but the widely used ZIP format
- is now processed far more quickly.
- 5. Added "Users' Question and Answer" section in manual. This section is
- updated with useful correspondence with registered and non-registered DFL
- users. And YES, we're happy to communicate with non-registered users.
- 6. Rearranged menus slightly for aesthetics.
- 7. International Language Support.
- 8. Added F2 print function to file viewing window.
- 9. Monochrome display improved.
- 10. Added '/mono' command-line option to force monochrome colors for weird
- display adapter/monitor combinations. It may also be used with the
- installation program.
-
- 11. Added the following new scan modes -
-
- A. Path Mode -
-
- DFL will scan your Path (see your dos manual for a description of the
- Path) for duplicate executables. The selected disks and scan mask are
- ignored. Only files matching *.EXE, *.COM and *.BAT on the Path are
- examined. As an example, DFL.EXE, DFL.COM and DFL.BAT are duplicate
- executables that, if in the Path, can cause some frustrating confusion.
-
- B. FastAlias Mode -
-
- In FastAlias mode, DFL attempts to locate files with duplicate contents
- using 32 bit CRCs. That is, files with equal lengths and equal CRCs are
- assumed to be duplicate. The chances of two files meeting this criteria
- and having different contents are on the order of 1 in millions. Under
- this mode, files that are determined to be duplicate are PRACTICALLY
- GUARANTEED to actually be duplicate. The benefits of this mode are:
-
- 1. The files are never actually compared byte-by-byte as in FullAlias
- mode (described below). This dramatically decreases the search time
- and disk activity.
- 2. Very time-consuming recursive situations that occur in previous
- versions of DFL are avoided.
- 3. DFL uses the same 32 bit CRC that is used in ZIP files. This means
- that doing a FastAlias search through ZIP files is incredibly fast
- because CRCs for the archived files are already computed and files
- never need to be extracted for a byte-by-byte comparison.
-
- C. Changed the old Alias mode to FullAlias Mode -
-
- In FullAlias mode, DFL attempts to locate files with duplicate contents
- by performing byte-by-byte comparisons of the contents of equal length
- & CRC files. Under this mode, files that are determined to be duplicate
- are GUARANTEED to actually be duplicate. This mode is essentially the
- same as FastAlias (described above) with the addition that the contents
- of two files are compared after the length and CRC are determined to be
- equal. The benefits of this mode are:
-
- 1. Because of the CRC layer, DFL knows ahead of time which files
- actually need to be compared and thus, performs fewer comparisons.
- Previous versions of DFL took the John Wayne approach and compared
- all equal length files. Users of older versions of DFL should notice
- a dramatic speed improvement in their Alias searches.
-
- 2. Unlike the 1-in-millions possibility under FastAlias, duplicate
- files found by FullAlias are GUARANTEED duplicate.
-