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- Modifications for version 4.1:
- o Added -r command line flag to allow recursive compression/
- decompression of directory trees. As a side-effect, compress
- no longer tries to compress/decompress anything that isn't
- a regular file. In particular, it ignores symbolic links.
- o zcat no longer cares whether a filename ends in .Z or
- not - it relies on the magic number in the file. If zcat
- is given a filename that doesn't end with .Z and the file
- referenced doesn't exist, zcat will append a .Z and try
- to open that instead.
- o compress -f will now compress multiply hardlinked files.
- Uncompress does not recreate the hard link, it creates
- a new file.
- o Removed compressdir/uncompressdir - no longer needed.
- o Removed atob/btoa/tarmail/untarmail - my versions are
- based on btoa 5.2 which is not compatible with the atob
- included with compress4.0.
- Compress version 4.0 improvements:
- o compress() speedup (10-50%) by changing division hash to xor
- o decompress() speedup (5-10%)
- o Memory requirements reduced (3-30%)
- o Stack requirements reduced to less than 4kb
- o Removed 'Big+Fast' compress code (FBITS) because of compress speedup
- o Portability mods for Z8000 and PC/XT (but not zeus 3.2)
- o Default to 'quiet' mode
- o Unification of 'force' flags
- o Manual page overhaul
- o Portability enhancement for M_XENIX
- o Removed text on #else and #endif
- o Added "-V" switch to print version and options
- o Added #defines for SIGNED_COMPARE_SLOW
- o Added Makefile and "usermem" program
- o Removed all floating point computations
- o New programs:
- compressdir - compress all files on a directory
- uncompressdir - uncompress all files on a directory
- zcmp - cmp compressed files
- zdiff - diff compressed files
- The following are with thanks to philabs!per:
- btoa - convert binary to ascii for mailing
- atob - convert ascii to binary with checksum
- tarmail - tar, compress, btoa, and mail files
- untarmail - restore "tarmail" files
-
- WARNING: These last few programs are not compatible
- with the original ones from the net. The encoding
- has changed. See btoa.c for more info.
-
-