/* $FreeBSD: src/usr.bin/compress/doc/revision.log,v 1.4 2001/08/13 14:06:30 ru Exp $ */ /* * $Header: /Users/Shared/file_cmds/file_cmds/compress/doc/revision.log,v 1.3 2005/04/12 23:51:24 nicolai Exp $ * $Log: revision.log,v $ * Revision 1.3 2005/04/12 23:51:24 nicolai * merging Tiger back to head * * Revision 1.1.1.2 2004/07/21 04:59:15 llattanz * Freshen source for standards conformance * * 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: /Users/Shared/file_cmds/file_cmds/compress/doc/revision.log,v 1.3 2005/04/12 23:51:24 nicolai Exp $";