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Diffstat (limited to 'usr.bin/compress/doc/revision.log')
| -rw-r--r-- | usr.bin/compress/doc/revision.log | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/usr.bin/compress/doc/revision.log b/usr.bin/compress/doc/revision.log new file mode 100644 index 0000000..2d5d9d9 --- /dev/null +++ b/usr.bin/compress/doc/revision.log @@ -0,0 +1,118 @@ +/* $FreeBSD$ */ + +/* + * $Header: compress.c,v 4.0 85/07/30 12:50:00 joe Release $ + * + * Revision 4.0 85/07/30 12:50:00 joe + * Removed ferror() calls in output routine on every output except first. + * Prepared for release to the world. + * + * Revision 3.6 85/07/04 01:22:21 joe + * Remove much wasted storage by overlaying hash table with the tables + * used by decompress: tab_suffix[1<<BITS], stack[8000]. Updated USERMEM + * computations. Fixed dump_tab() DEBUG routine. + * + * Revision 3.5 85/06/30 20:47:21 jaw + * Change hash function to use exclusive-or. Rip out hash cache. These + * speedups render the megamemory version defunct, for now. Make decoder + * stack global. Parts of the RCS trunks 2.7, 2.6, and 2.1 no longer apply. + * + * Revision 3.4 85/06/27 12:00:00 ken + * Get rid of all floating-point calculations by doing all compression ratio + * calculations in fixed point. + * + * Revision 3.3 85/06/24 21:53:24 joe + * Incorporate portability suggestion for M_XENIX. Got rid of text on #else + * and #endif lines. Cleaned up #ifdefs for vax and interdata. + * + * Revision 3.2 85/06/06 21:53:24 jaw + * Incorporate portability suggestions for Z8000, IBM PC/XT from mailing list. + * Default to "quiet" output (no compression statistics). + * + * Revision 3.1 85/05/12 18:56:13 jaw + * Integrate decompress() stack speedups (from early pointer mods by McKie). + * Repair multi-file USERMEM gaffe. Unify 'force' flags to mimic semantics + * of SVR2 'pack'. Streamline block-compress table clear logic. Increase + * output byte count by magic number size. + * + * Revision 3.0 84/11/27 11:50:00 petsd!joe + * Set HSIZE depending on BITS. Set BITS depending on USERMEM. Unrolled + * loops in clear routines. Added "-C" flag for 2.0 compatibility. Used + * unsigned compares on Perkin-Elmer. Fixed foreground check. + * + * Revision 2.7 84/11/16 19:35:39 ames!jaw + * Cache common hash codes based on input statistics; this improves + * performance for low-density raster images. Pass on #ifdef bundle + * from Turkowski. + * + * Revision 2.6 84/11/05 19:18:21 ames!jaw + * Vary size of hash tables to reduce time for small files. + * Tune PDP-11 hash function. + * + * Revision 2.5 84/10/30 20:15:14 ames!jaw + * Junk chaining; replace with the simpler (and, on the VAX, faster) + * double hashing, discussed within. Make block compression standard. + * + * Revision 2.4 84/10/16 11:11:11 ames!jaw + * Introduce adaptive reset for block compression, to boost the rate + * another several percent. (See mailing list notes.) + * + * Revision 2.3 84/09/22 22:00:00 petsd!joe + * Implemented "-B" block compress. Implemented REVERSE sorting of tab_next. + * Bug fix for last bits. Changed fwrite to putchar loop everywhere. + * + * Revision 2.2 84/09/18 14:12:21 ames!jaw + * Fold in news changes, small machine typedef from thomas, + * #ifdef interdata from joe. + * + * Revision 2.1 84/09/10 12:34:56 ames!jaw + * Configured fast table lookup for 32-bit machines. + * This cuts user time in half for b <= FBITS, and is useful for news batching + * from VAX to PDP sites. Also sped up decompress() [fwrite->putc] and + * added signal catcher [plus beef in writeerr()] to delete effluvia. + * + * Revision 2.0 84/08/28 22:00:00 petsd!joe + * Add check for foreground before prompting user. Insert maxbits into + * compressed file. Force file being uncompressed to end with ".Z". + * Added "-c" flag and "zcat". Prepared for release. + * + * Revision 1.10 84/08/24 18:28:00 turtlevax!ken + * Will only compress regular files (no directories), added a magic number + * header (plus an undocumented -n flag to handle old files without headers), + * added -f flag to force overwriting of possibly existing destination file, + * otherwise the user is prompted for a response. Will tack on a .Z to a + * filename if it doesn't have one when decompressing. Will only replace + * file if it was compressed. + * + * Revision 1.9 84/08/16 17:28:00 turtlevax!ken + * Removed scanargs(), getopt(), added .Z extension and unlimited number of + * filenames to compress. Flags may be clustered (-Ddvb12) or separated + * (-D -d -v -b 12), or combination thereof. Modes and other status is + * copied with copystat(). -O bug for 4.2 seems to have disappeared with + * 1.8. + * + * Revision 1.8 84/08/09 23:15:00 joe + * Made it compatible with vax version, installed jim's fixes/enhancements + * + * Revision 1.6 84/08/01 22:08:00 joe + * Sped up algorithm significantly by sorting the compress chain. + * + * Revision 1.5 84/07/13 13:11:00 srd + * Added C version of vax asm routines. Changed structure to arrays to + * save much memory. Do unsigned compares where possible (faster on + * Perkin-Elmer) + * + * Revision 1.4 84/07/05 03:11:11 thomas + * Clean up the code a little and lint it. (Lint complains about all + * the regs used in the asm, but I'm not going to "fix" this.) + * + * Revision 1.3 84/07/05 02:06:54 thomas + * Minor fixes. + * + * Revision 1.2 84/07/05 00:27:27 thomas + * Add variable bit length output. + * + */ + +static char rcs_ident[] = + "$Header: compress.c,v 4.0 85/07/30 12:50:00 joe Release $"; |
