GTI@PSUVMA.BITNET (Leon Geesey) (07/12/87)
Someone pasted the games BLASTCGA and BLASTHRC to the net recently and
seems to have neglected or forgotten that maybe not everybody has the
program that he used to COMPRESS the file. Being a student and having
to work on an IBM mainframe and a PC-Clone hooked up as a terminal I don't
have all these utilities that compress files in different ways. Could
someone please send me a copy of COMPRESS or post it to the NET since there
are probably others that have the same problem. I was also wondering if
people want to compress stuff to post, why don't they use ARC or PKARC
which most people have and has been posted to the net numerous time
Leon
root@conexch.UUCP (Super user) (07/13/87)
You can get a copy of compress for the PC from The Consultants' Exchange
by calling (714) 842-5851. Login as guest. Look for the file in
/bbs/guest/guest/tmp/compress.exe.
Larry Dighera:
The Consultants' Exchange BBS: (714) 842-6348: IBM-PC BBS
(714) 842-5851: Xenix guest account
UUCP: ...!ucbvax!ucivax!mickey!conexch!sysop Login: nuucp
USMAIL: Box 12100, Santa Ana, CA 92712jru@etn-rad.UUCP (John Unekis) (07/13/87)
In article <16612GTI@PSUVMA> GTI@PSUVMA.BITNET (Leon Geesey) writes: >Someone pasted the games BLASTCGA and BLASTHRC to the net recently and >seems to have neglected or forgotten that maybe not everybody has the >program that he used to COMPRESS the file. Being a student and having >to work on an IBM mainframe and a PC-Clone hooked up as a terminal I don't >have all these utilities that compress files in different ways. Could >someone please send me a copy of COMPRESS or post it to the NET since there >are probably others that have the same problem. I was also wondering if >people want to compress stuff to post, why don't they use ARC or PKARC >which most people have and has been posted to the net numerous time > > Leon > Sorry about that, here is the source that we have for compress. # This is a shar archive. # Remove everything above this line. # Run the file through sh, not csh. # (type `sh ../compress.sh.1') # If you do not see the message # `../compress.sh.1 completed!' # then the file was incomplete. echo extracting - compress.1 sed 's/^X//' > compress.1 << 'FRIDAY_NIGHT' X.PU X.TH COMPRESS 1 local X.SH NAME Xcompress, uncompress, zcat \- compress and expand data X.SH SYNOPSIS X.ll +8 X.B compress X[ X.B \-f X] [ X.B \-v X] [ X.B \-c X] [ X.B \-V X] [ X.B \-b X.I bits X] [ X.I "name \&..." X] X.ll -8 X.br X.B uncompress X[ X.B \-f X] [ X.B \-v X] [ X.B \-c X] [ X.B \-V X] [ X.I "name \&..." X] X.br X.B zcat X[ X.B \-V X] [ X.I "name \&..." X] X.SH DESCRIPTION X.I Compress Xreduces the size of the named files using adaptive Lempel-Ziv coding. XWhenever possible, Xeach file is replaced by one with the extension X.B "\&.Z," Xwhile keeping the same ownership modes, access and modification times. XIf no files are specified, the standard input is compressed to the Xstandard output. XCompressed files can be restored to their original form using X.I uncompress Xor X.I zcat. X.PP XThe X.B \-f Xoption will force compression of X.I name. XThis is useful for compressing an entire directory, Xeven if some of the files do not actually shrink. XIf X.B \-f Xis not given and X.I compress Xis run in the foreground, Xthe user is prompted as to whether an existing file should be overwritten. X.PP XThe X.B \-c Xoption makes X.I compress/uncompress Xwrite to the standard output; no files are changed. XThe nondestructive behavior of X.I zcat Xis identical to that of X.I uncompress X.B \-c. X.PP X.I Compress Xuses the modified Lempel-Ziv algorithm popularized in X"A Technique for High Performance Data Compression", XTerry A. Welch, X.I "IEEE Computer," Xvol. 17, no. 6 (June 1984), pp. 8-19. XCommon substrings in the file are first replaced by 9-bit codes 257 and up. XWhen code 512 is reached, the algorithm switches to 10-bit codes and Xcontinues to use more bits until the Xlimit specified by the X.B \-b Xflag is reached (default 16). X.I Bits Xmust be between 9 and 16. The default can be changed in the source to allow X.I compress Xto be run on a smaller machine. X.PP XAfter the X.I bits Xlimit is attained, X.I compress Xperiodically checks the compression ratio. If it is increasing, X.I compress Xcontinues to use the existing code dictionary. However, Xif the compression ratio decreases, X.I compress Xdiscards the table of substrings and rebuilds it from scratch. This allows Xthe algorithm to adapt to the next "block" of the file. X.PP XNote that the X.B \-b Xflag is omitted for X.I uncompress, Xsince the X.I bits Xparameter specified during compression Xis encoded within the output, along with Xa magic number to ensure that neither decompression of random data nor Xrecompression of compressed data is attempted. X.PP X.ne 8 XThe amount of compression obtained depends on the size of the Xinput, the number of X.I bits Xper code, and the distribution of common substrings. XTypically, text such as source code or English Xis reduced by 50\-60%. XCompression is generally much better than that achieved by XHuffman coding (as used in X.IR pack ), Xor adaptive Huffman coding X.RI ( compact ), Xand takes less time to compute. X.PP XUnder the X.B \-v Xoption, Xa message is printed yielding the percentage of Xreduction for each file compressed. X.PP XIf the X.B \-V Xoption is specified, the current version and compile options are printed on Xstderr. X.PP XExit status is normally 0; Xif the last file is larger after (attempted) compression, the status is 2; Xif an error occurs, exit status is 1. X.SH "SEE ALSO" Xpack(1), compact(1) X.SH "DIAGNOSTICS" XUsage: compress [\-dfvcV] [\-b maxbits] [file ...] X.in +8 XInvalid options were specified on the command line. X.in -8 XMissing maxbits X.in +8 XMaxbits must follow X.BR \-b \. X.in -8 X.IR file : Xnot in compressed format X.in +8 XThe file specified to X.I uncompress Xhas not been compressed. X.in -8 X.IR file : Xcompressed with X.I xx Xbits, can only handle X.I yy Xbits X.in +8 X.I File Xwas compressed by a program that could deal with Xmore X.I bits Xthan the compress code on this machine. XRecompress the file with smaller X.IR bits \. X.in -8 X.IR file : Xalready has .Z suffix -- no change X.in +8 XThe file is assumed to be already compressed. XRename the file and try again. X.in -8 X.IR file : Xfilename too long to tack on .Z X.in +8 XThe file cannot be compressed because its name is longer than X12 characters. XRename and try again. XThis message does not occur on BSD systems. X.in -8 X.I file Xalready exists; do you wish to overwrite (y or n)? X.in +8 XRespond "y" if you want the output file to be replaced; "n" if not. X.in -8 Xuncompress: corrupt input X.in +8 XA SIGSEGV violation was detected which usually means that the input file has Xbeen corrupted. X.in -8 XCompression: X.I "xx.xx%" X.in +8 XPercentage of the input saved by compression. X(Relevant only for X.BR \-v \.) X.in -8 X-- not a regular file: unchanged X.in +8 XWhen the input file is not a regular file, X(e.g. a directory), it is Xleft unaltered. X.in -8 X-- has X.I xx Xother links: unchanged X.in +8 XThe input file has links; it is left unchanged. See X.IR ln "(1)" Xfor more information. X.in -8 X-- file unchanged X.in +8 XNo savings is achieved by Xcompression. The input remains virgin. X.in -8 X.SH "BUGS" XAlthough compressed files are compatible between machines with large memory, X.BR \-b \12 Xshould be used for file transfer to architectures with Xa small process data space (64KB or less, as exhibited by the DEC PDP Xseries, the Intel 80286, etc.) FRIDAY_NIGHT echo extracting - compress.c sed 's/^X//' > compress.c << 'FRIDAY_NIGHT' X/* X * Compress - data compression program X */ X#define min(a,b) ((a>b) ? b : a) X X/* X * machine variants which require cc -Dmachine: pdp11, z8000, pcxt X */ X X/* X * Set USERMEM to the maximum amount of physical user memory available X * in bytes. USERMEM is used to determine the maximum BITS that can be used X * for compression. X * X * SACREDMEM is the amount of physical memory saved for others; compress X * will hog the rest. X */ X#ifndef SACREDMEM X#define SACREDMEM 0 X#endif X X#ifndef USERMEM X# define USERMEM 450000 /* default user memory */ X#endif X X#ifdef interdata /* (Perkin-Elmer) */ X#define SIGNED_COMPARE_SLOW /* signed compare is slower than unsigned */ X#endif X X#ifdef pdp11 X# define BITS 12 /* max bits/code for 16-bit machine */ X# define NO_UCHAR /* also if "unsigned char" functions as signed char */ X# undef USERMEM X#endif /* pdp11 */ /* don't forget to compile with -i */ X X#ifdef z8000 X# define BITS 12 X# undef vax /* weird preprocessor */ X# undef USERMEM X#endif /* z8000 */ X X#ifdef pcxt X# define BITS 12 X# undef USERMEM X#endif /* pcxt */ X X#ifdef USERMEM X# if USERMEM >= (433484+SACREDMEM) X# define PBITS 16 X# else X# if USERMEM >= (229600+SACREDMEM) X# define PBITS 15 X# else X# if USERMEM >= (127536+SACREDMEM) X# define PBITS 14 X# else X# if USERMEM >= (73464+SACREDMEM) X# define PBITS 13 X# else X# define PBITS 12 X# endif X# endif X# endif X# endif X# undef USERMEM X#endif /* USERMEM */ X X#ifdef PBITS /* Preferred BITS for this memory size */ X# ifndef BITS X# define BITS PBITS X# endif BITS X#endif /* PBITS */ X X#if BITS == 16 X# define HSIZE 69001 /* 95% occupancy */ X#endif X#if BITS == 15 X# define HSIZE 35023 /* 94% occupancy */ X#endif X#if BITS == 14 X# define HSIZE 18013 /* 91% occupancy */ X#endif X#if BITS == 13 X# define HSIZE 9001 /* 91% occupancy */ X#endif X#if BITS <= 12 X# define HSIZE 5003 /* 80% occupancy */ X#endif X X#ifdef M_XENIX /* Stupid compiler can't handle arrays with */ X# if BITS == 16 /* more than 65535 bytes - so we fake it */ X# define XENIX_16 X# else X# if BITS > 13 /* Code only handles BITS = 12, 13, or 16 */ X# define BITS 13 X# endif X# endif X#endif X X/* X * a code_int must be able to hold 2**BITS values of type int, and also -1 X */ X#if BITS > 15 Xtypedef long int code_int; X#else Xtypedef int code_int; X#endif X X#ifdef SIGNED_COMPARE_SLOW Xtypedef unsigned long int count_int; Xtypedef unsigned short int count_short; X#else Xtypedef long int count_int; X#endif X X#ifdef NO_UCHAR X typedef char char_type; X#else X typedef unsigned char char_type; X#endif /* UCHAR */ Xchar_type magic_header[] = { "\037\235" }; /* 1F 9D */ X X/* Defines for third byte of header */ X#define BIT_MASK 0x1f X#define BLOCK_MASK 0x80 X/* Masks 0x40 and 0x20 are free. I think 0x20 should mean that there is X a fourth header byte (for expansion). X*/ X#define INIT_BITS 9 /* initial number of bits/code */ X X/* X * compress.c - File compression ala IEEE Computer, June 1984. X * X * Authors: Spencer W. Thomas (decvax!harpo!utah-cs!utah-gr!thomas) X * Jim McKie (decvax!mcvax!jim) X * Steve Davies (decvax!vax135!petsd!peora!srd) X * Ken Turkowski (decvax!decwrl!turtlevax!ken) X * James A. Woods (decvax!ihnp4!ames!jaw) X * Joe Orost (decvax!vax135!petsd!joe) X * X * $Header: compress.c,v 4.0 85/07/30 12:50:00 joe Release $ X * $Log: compress.c,v $ X * Revision 4.0 85/07/30 12:50:00 joe X * Removed ferror() calls in output routine on every output except first. X * Prepared for release to the world. X * X * Revision 3.6 85/07/04 01:22:21 joe X * Remove much wasted storage by overlaying hash table with the tables X * used by decompress: tab_suffix[1<<BITS], stack[8000]. Updated USERMEM X * computations. Fixed dump_tab() DEBUG routine. X * X * Revision 3.5 85/06/30 20:47:21 jaw X * Change hash function to use exclusive-or. Rip out hash cache. These X * speedups render the megamemory version defunct, for now. Make decoder X * stack global. Parts of the RCS trunks 2.7, 2.6, and 2.1 no longer apply. X * X * Revision 3.4 85/06/27 12:00:00 ken X * Get rid of all floating-point calculations by doing all compression ratio X * calculations in fixed point. X * X * Revision 3.3 85/06/24 21:53:24 joe X * Incorporate portability suggestion for M_XENIX. Got rid of text on #else X * and #endif lines. Cleaned up #ifdefs for vax and interdata. X * X * Revision 3.2 85/06/06 21:53:24 jaw X * Incorporate portability suggestions for Z8000, IBM PC/XT from mailing list. X * Default to "quiet" output (no compression statistics). X * X * Revision 3.1 85/05/12 18:56:13 jaw X * Integrate decompress() stack speedups (from early pointer mods by McKie). X * Repair multi-file USERMEM gaffe. Unify 'force' flags to mimic semantics X * of SVR2 'pack'. Streamline block-compress table clear logic. Increase X * output byte count by magic number size. X * X * Revision 3.0 84/11/27 11:50:00 petsd!joe X * Set HSIZE depending on BITS. Set BITS depending on USERMEM. Unrolled X * loops in clear routines. Added "-C" flag for 2.0 compatibility. Used X * unsigned compares on Perkin-Elmer. Fixed foreground check. X * X * Revision 2.7 84/11/16 19:35:39 ames!jaw X * Cache common hash codes based on input statistics; this improves X * performance for low-density raster images. Pass on #ifdef bundle X * from Turkowski. X * X * Revision 2.6 84/11/05 19:18:21 ames!jaw X * Vary size of hash tables to reduce time for small files. X * Tune PDP-11 hash function. X * X * Revision 2.5 84/10/30 20:15:14 ames!jaw X * Junk chaining; replace with the simpler (and, on the VAX, faster) X * double hashing, discussed within. Make block compression standard. X * X * Revision 2.4 84/10/16 11:11:11 ames!jaw X * Introduce adaptive reset for block compression, to boost the rate X * another several percent. (See mailing list notes.) X * X * Revision 2.3 84/09/22 22:00:00 petsd!joe X * Implemented "-B" block compress. Implemented REVERSE sorting of tab_next. X * Bug fix for last bits. Changed fwrite to putchar loop everywhere. X * X * Revision 2.2 84/09/18 14:12:21 ames!jaw X * Fold in news changes, small machine typedef from thomas, X * #ifdef interdata from joe. X * X * Revision 2.1 84/09/10 12:34:56 ames!jaw X * Configured fast table lookup for 32-bit machines. X * This cuts user time in half for b <= FBITS, and is useful for news batching X * from VAX to PDP sites. Also sped up decompress() [fwrite->putc] and X * added signal catcher [plus beef in writeerr()] to delete effluvia. X * X * Revision 2.0 84/08/28 22:00:00 petsd!joe X * Add check for foreground before prompting user. Insert maxbits into X * compressed file. Force file being uncompressed to end with ".Z". X * Added "-c" flag and "zcat". Prepared for release. X * X * Revision 1.10 84/08/24 18:28:00 turtlevax!ken X * Will only compress regular files (no directories), added a magic number X * header (plus an undocumented -n flag to handle old files without headers), X * added -f flag to force overwriting of possibly existing destination file, X * otherwise the user is prompted for a response. Will tack on a .Z to a X * filename if it doesn't have one when decompressing. Will only replace X * file if it was compressed. X * X * Revision 1.9 84/08/16 17:28:00 turtlevax!ken X * Removed scanargs(), getopt(), added .Z extension and unlimited number of X * filenames to compress. Flags may be clustered (-Ddvb12) or separated X * (-D -d -v -b 12), or combination thereof. Modes and other status is X * copied with copystat(). -O bug for 4.2 seems to have disappeared with X * 1.8. X * X * Revision 1.8 84/08/09 23:15:00 joe X * Made it compatible with vax version, installed jim's fixes/enhancements X * X * Revision 1.6 84/08/01 22:08:00 joe X * Sped up algorithm significantly by sorting the compress chain. X * X * Revision 1.5 84/07/13 13:11:00 srd X * Added C version of vax asm routines. Changed structure to arrays to X * save much memory. Do unsigned compares where possible (faster on X * Perkin-Elmer) X * X * Revision 1.4 84/07/05 03:11:11 thomas X * Clean up the code a little and lint it. (Lint complains about all X * the regs used in the asm, but I'm not going to "fix" this.) X * X * Revision 1.3 84/07/05 02:06:54 thomas X * Minor fixes. X * X * Revision 1.2 84/07/05 00:27:27 thomas X * Add variable bit length output. X * X */ Xstatic char rcs_ident[] = "$Header: compress.c,v 4.0 85/07/30 12:50:00 joe Release $"; X X#include <stdio.h> X#include <ctype.h> X#include <signal.h> X#include <sys/types.h> X#include <sys/stat.h> X X#define ARGVAL() (*++(*argv) || (--argc && *++argv)) X Xint n_bits; /* number of bits/code */ Xint maxbits = BITS; /* user settable max # bits/code */ Xcode_int maxcode; /* maximum code, given n_bits */ Xcode_int maxmaxcode = 1 << BITS; /* should NEVER generate this code */ X#ifdef COMPATIBLE /* But wrong! */ X# define MAXCODE(n_bits) (1 << (n_bits) - 1) X#else X# define MAXCODE(n_bits) ((1 << (n_bits)) - 1) X#endif /* COMPATIBLE */ X X#ifdef XENIX_16 Xcount_int htab0[8192]; Xcount_int htab1[8192]; Xcount_int htab2[8192]; Xcount_int htab3[8192]; Xcount_int htab4[8192]; Xcount_int htab5[8192]; Xcount_int htab6[8192]; Xcount_int htab7[8192]; Xcount_int htab8[HSIZE-65536]; Xcount_int * htab[9] = { X htab0, htab1, htab2, htab3, htab4, htab5, htab6, htab7, htab8 }; X X#define htabof(i) (htab[(i) >> 13][(i) & 0x1fff]) Xunsigned short code0tab[16384]; Xunsigned short code1tab[16384]; Xunsigned short code2tab[16384]; Xunsigned short code3tab[16384]; Xunsigned short code4tab[16384]; Xunsigned short * codetab[5] = { X code0tab, code1tab, code2tab, code3tab, code4tab }; X X#define codetabof(i) (codetab[(i) >> 14][(i) & 0x3fff]) X X#else /* Normal machine */ Xcount_int htab [HSIZE]; Xunsigned short codetab [HSIZE]; X#define htabof(i) htab[i] X#define codetabof(i) codetab[i] X#endif /* XENIX_16 */ Xcode_int hsize = HSIZE; /* for dynamic table sizing */ Xcount_int fsize; X X/* X * To save much memory, we overlay the table used by compress() with those X * used by decompress(). The tab_prefix table is the same size and type X * as the codetab. The tab_suffix table needs 2**BITS characters. We X * get this from the beginning of htab. The output stack uses the rest X * of htab, and contains characters. There is plenty of room for any X * possible stack (stack used to be 8000 characters). X */ X X#define tab_prefixof(i) codetabof(i) X#ifdef XENIX_16 X# define tab_suffixof(i) ((char_type *)htab[(i)>>15])[(i) & 0x7fff] X# define de_stack ((char_type *)(htab2)) X#else /* Normal machine */ X# define tab_suffixof(i) ((char_type *)(htab))[i] X# define de_stack ((char_type *)&tab_suffixof(1<<BITS)) X#endif /* XENIX_16 */ X Xcode_int free_ent = 0; /* first unused entry */ Xint exit_stat = 0; X Xcode_int getcode(); X XUsage() { X#ifdef DEBUG Xfprintf(stderr,"Usage: compress [-dDVfc] [-b maxbits] [file ...]\n"); X} Xint debug = 0; X#else Xfprintf(stderr,"Usage: compress [-dfvcV] [-b maxbits] [file ...]\n"); X} X#endif /* DEBUG */ Xint nomagic = 0; /* Use a 3-byte magic number header, unless old file */ Xint zcat_flg = 0; /* Write output on stdout, suppress messages */ Xint quiet = 1; /* don't tell me about compression */ X X/* X * block compression parameters -- after all codes are used up, X * and compression rate changes, start over. X */ Xint block_compress = BLOCK_MASK; Xint clear_flg = 0; Xlong int ratio = 0; X#define CHECK_GAP 10000 /* ratio check interval */ Xcount_int checkpoint = CHECK_GAP; X/* X * the next two codes should not be changed lightly, as they must not X * lie within the contiguous general code space. X */ X#define FIRST 257 /* first free entry */ X#define CLEAR 256 /* table clear output code */ X Xint force = 0; Xchar ofname [100]; X#ifdef DEBUG Xint verbose = 0; X#endif /* DEBUG */ Xint (*bgnd_flag)(); X Xint do_decomp = 0; X X/***************************************************************** X * TAG( main ) X * X * Algorithm from "A Technique for High Performance Data Compression", X * Terry A. Welch, IEEE Computer Vol 17, No 6 (June 1984), pp 8-19. X * X * Usage: compress [-dfvc] [-b bits] [file ...] X * Inputs: X * -d: If given, decompression is done instead. X * X * -c: Write output on stdout, don't remove original. X * X * -b: Parameter limits the max number of bits/code. X * X * -f: Forces output file to be generated, even if one already X * exists, and even if no space is saved by compressing. X * If -f is not used, the user will be prompted if stdin is X * a tty, otherwise, the output file will not be overwritten. X * X * -v: Write compression statistics X * X * file ...: Files to be compressed. If none specified, stdin X * is used. X * Outputs: X * file.Z: Compressed form of file with same mode, owner, and utimes X * or stdout (if stdin used as input) X * X * Assumptions: X * When filenames are given, replaces with the compressed version X * (.Z suffix) only if the file decreases in size. X * Algorithm: X * Modified Lempel-Ziv method (LZW). Basically finds common X * substrings and replaces them with a variable size code. This is X * deterministic, and can be done on the fly. Thus, the decompression X * procedure needs no input table, but tracks the way the table was built. X */ X Xmain( argc, argv ) Xregister int argc; char **argv; X{ X int overwrite = 0; /* Do not overwrite unless given -f flag */ X char tempname[100]; X char **filelist, **fileptr; X char *cp, *rindex(), *malloc(); X struct stat statbuf; X extern onintr(), oops(); X X X if ( (bgnd_flag = signal ( SIGINT, SIG_IGN )) != SIG_IGN ) { X signal ( SIGINT, onintr ); X signal ( SIGSEGV, oops ); X } X X#ifdef COMPATIBLE X nomagic = 1; /* Original didn't have a magic number */ X#endif /* COMPATIBLE */ X X filelist = fileptr = (char **)(malloc(argc * sizeof(*argv))); X *filelist = NULL; X X if((cp = rindex(argv[0], '/')) != 0) { X cp++; X } else { X cp = argv[0]; X } X if(strcmp(cp, "uncompress") == 0) { X do_decomp = 1; X } else if(strcmp(cp, "zcat") == 0) { X do_decomp = 1; X zcat_flg = 1; X } X X#ifdef BSD4_2 X /* 4.2BSD dependent - take it out if not */ X setlinebuf( stderr ); X#endif /* BSD4_2 */ X X /* Argument Processing X * All flags are optional. X * -D => debug X * -V => print Version; debug verbose X * -d => do_decomp X * -v => unquiet X * -f => force overwrite of output file X * -n => no header: useful to uncompress old files X * -b maxbits => maxbits. If -b is specified, then maxbits MUST be X * given also. X * -c => cat all output to stdout X * -C => generate output compatible with compress 2.0. X * if a string is left, must be an input filename. X */ X for (argc--, argv++; argc > 0; argc--, argv++) { X if (**argv == '-') { /* A flag argument */ X while (*++(*argv)) { /* Process all flags in this arg */ X switch (**argv) { X#ifdef DEBUG X case 'D': X debug = 1; X break; X case 'V': X verbose = 1; X version(); X break; X#else X case 'V': X version(); X break; X#endif /* DEBUG */ X case 'v': X quiet = 0; X break; X case 'd': X do_decomp = 1; X break; X case 'f': X case 'F': X overwrite = 1; X force = 1; X break; X case 'n': X nomagic = 1; X break; X case 'C': X block_compress = 0; X break; X case 'b': X if (!ARGVAL()) { X fprintf(stderr, "Missing maxbits\n"); X Usage(); X exit(1); X } X maxbits = atoi(*argv); X goto nextarg; X case 'c': X zcat_flg = 1; X break; X case 'q': X quiet = 1; X break; X default: X fprintf(stderr, "Unknown flag: '%c'; ", **argv); X Usage(); X exit(1); X } X } X } X else { /* Input file name */ X *fileptr++ = *argv; /* Build input file list */ X *fileptr = NULL; X /* process nextarg; */ X } X nextarg: continue; X } X X if(maxbits < INIT_BITS) maxbits = INIT_BITS; X if (maxbits > BITS) maxbits = BITS; X maxmaxcode = 1 << maxbits; X X if (*filelist != NULL) { X for (fileptr = filelist; *fileptr; fileptr++) { X exit_stat = 0; X if (do_decomp != 0) { /* DECOMPRESSION */ X /* Check for .Z suffix */ X if (strcmp(*fileptr + strlen(*fileptr) - 2, ".Z") != 0) { X /* No .Z: tack one on */ X strcpy(tempname, *fileptr); X strcat(tempname, ".Z"); X *fileptr = tempname; X } X /* Open input file */ X if ((freopen(*fileptr, "r", stdin)) == NULL) { X perror(*fileptr); continue; X } X /* Check the magic number */ X if (nomagic == 0) { X if ((getchar() != (magic_header[0] & 0xFF)) X || (getchar() != (magic_header[1] & 0xFF))) { X fprintf(stderr, "%s: not in compressed format\n", X *fileptr); X continue; X } X maxbits = getchar(); /* set -b from file */ X block_compress = maxbits & BLOCK_MASK; X maxbits &= BIT_MASK; X maxmaxcode = 1 << maxbits; X if(maxbits > BITS) { X fprintf(stderr, X "%s: compressed with %d bits, can only handle %d bits\n", X *fileptr, maxbits, BITS); X continue; X } X } X /* Generate output filename */ X strcpy(ofname, *fileptr); X ofname[strlen(*fileptr) - 2] = '\0'; /* Strip off .Z */ X } else { /* COMPRESSION */ X if (strcmp(*fileptr + strlen(*fileptr) - 2, ".Z") == 0) { X fprintf(stderr, "%s: already has .Z suffix -- no change\n", X *fileptr); X continue; X } X /* Open input file */ X if ((freopen(*fileptr, "r", stdin)) == NULL) { X perror(*fileptr); continue; X } X stat ( *fileptr, &statbuf ); X fsize = (long) statbuf.st_size; X /* X * tune hash table size for small files -- ad hoc, X * but the sizes match earlier #defines, which X * serve as upper bounds on the number of output codes. X */ X hsize = HSIZE; X if ( fsize < (1 << 12) ) X hsize = min ( 5003, HSIZE ); X else if ( fsize < (1 << 13) ) X hsize = min ( 9001, HSIZE ); X else if ( fsize < (1 << 14) ) X hsize = min ( 18013, HSIZE ); X else if ( fsize < (1 << 15) ) X hsize = min ( 35023, HSIZE ); X else if ( fsize < 47000 ) X hsize = min ( 50021, HSIZE ); X X /* Generate output filename */ X strcpy(ofname, *fileptr); X#ifndef BSD4_2 /* Short filenames */ X if ((cp=rindex(ofname,'/')) != NULL) cp++; X else cp = ofname; X if (strlen(cp) > 12) { X fprintf(stderr,"%s: filename too long to tack on .Z\n",cp); X continue; X } X#endif /* BSD4_2 Long filenames allowed */ X strcat(ofname, ".Z"); X } X /* Check for overwrite of existing file */ X if (overwrite == 0 && zcat_flg == 0) { X if (stat(ofname, &statbuf) == 0) { X char response[2]; X response[0] = 'n'; X fprintf(stderr, "%s already exists;", ofname); X if (foreground()) { X fprintf(stderr, " do you wish to overwrite %s (y or n)? ", X ofname); X fflush(stderr); X read(2, response, 2); X while (response[1] != '\n') { X if (read(2, response+1, 1) < 0) { /* Ack! */ X perror("stderr"); break; X } X } X } X if (response[0] != 'y') { X fprintf(stderr, "\tnot overwritten\n"); X continue; X } X } X } X if(zcat_flg == 0) { /* Open output file */ X if (freopen(ofname, "w", stdout) == NULL) { X perror(ofname); X continue; X } X if(!quiet) X fprintf(stderr, "%s: ", *fileptr); X } X X /* Actually do the compression/decompression */ X if (do_decomp == 0) compress(); X#ifndef DEBUG X else decompress(); X#else X else if (debug == 0) decompress(); X else printcodes(); X if (verbose) dump_tab(); X#endif /* DEBUG */ X if(zcat_flg == 0) { X copystat(*fileptr, ofname); /* Copy stats */ X if((exit_stat == 1) || (!quiet)) X putc('\n', stderr); X } X } X } else { /* Standard input */ X if (do_decomp == 0) { X compress(); X#ifdef DEBUG X if(verbose) dump_tab(); X#endif /* DEBUG */ X if(!quiet) X putc('\n', stderr); X } else { X /* Check the magic number */ X if (nomagic == 0) { X if ((getchar()!=(magic_header[0] & 0xFF)) X || (getchar()!=(magic_header[1] & 0xFF))) { X fprintf(stderr, "stdin: not in compressed format\n"); X exit(1); X } X maxbits = getchar(); /* set -b from file */ X block_compress = maxbits & BLOCK_MASK; X maxbits &= BIT_MASK; X maxmaxcode = 1 << maxbits; X fsize = 100000; /* assume stdin large for USERMEM */ X if(maxbits > BITS) { X fprintf(stderr, X "stdin: compressed with %d bits, can only handle %d bits\n", X maxbits, BITS); X exit(1); X } X } X#ifndef DEBUG X decompress(); X#else X if (debug == 0) decompress(); X else printcodes(); X if (verbose) dump_tab(); X#endif /* DEBUG */ X } X } X exit(exit_stat); X} X Xstatic int offset; Xlong int in_count = 1; /* length of input */ Xlong int bytes_out; /* length of compressed output */ Xlong int out_count = 0; /* # of codes output (for debugging) */ X X/* X * compress stdin to stdout X * X * Algorithm: use open addressing double hashing (no chaining) on the X * prefix code / next character combination. We do a variant of Knuth's X * algorithm D (vol. 3, sec. 6.4) along with G. Knott's relatively-prime X * secondary probe. Here, the modular division first probe is gives way X * to a faster exclusive-or manipulation. Also do block compression with X * an adaptive reset, whereby the code table is cleared when the compression X * ratio decreases, but after the table fills. The variable-length output X * codes are re-sized at this point, and a special CLEAR code is generated X * for the decompressor. Late addition: construct the table according to X * file size for noticeable speed improvement on small files. Please direct X * questions about this implementation to ames!jaw. X */ X Xcompress() { X register long fcode; X register code_int i = 0; X register int c; X register code_int ent; X#ifdef XENIX_16 X register code_int disp; X#else /* Normal machine */ X register int disp; X#endif X register code_int hsize_reg; X register int hshift; X X#ifndef COMPATIBLE X if (nomagic == 0) { X putchar(magic_header[0]); putchar(magic_header[1]); X putchar((char)(maxbits | block_compress)); X if(ferror(stdout)) X writeerr(); X } X#endif /* COMPATIBLE */ X X offset = 0; X bytes_out = 3; /* includes 3-byte header mojo */ X out_count = 0; X clear_flg = 0; X ratio = 0; X in_count = 1; X checkpoint = CHECK_GAP; X maxcode = MAXCODE(n_bits = INIT_BITS); X free_ent = ((block_compress) ? FIRST : 256 ); X X ent = getchar (); X X hshift = 0; X for ( fcode = (long) hsize; fcode < 65536L; fcode *= 2L ) X hshift++; X hshift = 8 - hshift; /* set hash code range bound */ X X hsize_reg = hsize; X cl_hash( (count_int) hsize_reg); /* clear hash table */ X X#ifdef SIGNED_COMPARE_SLOW X while ( (c = getchar()) != (unsigned) EOF ) { X#else X while ( (c = getchar()) != EOF ) { X#endif X in_count++; X fcode = (long) (((long) c << maxbits) + ent); X i = ((c << hshift) ^ ent); /* xor hashing */ X X if ( htabof (i) == fcode ) { X ent = codetabof (i); X continue; X } else if ( (long)htabof (i) < 0 ) /* empty slot */ X goto nomatch; X disp = hsize_reg - i; /* secondary hash (after G. Knott) */ X if ( i == 0 ) X disp = 1; Xprobe: X if ( (i -= disp) < 0 ) X i += hsize_reg; X X if ( htabof (i) == fcode ) { X ent = codetabof (i); X continue; X } X if ( (long)htabof (i) > 0 ) X goto probe; Xnomatch: X output ( (code_int) ent ); X out_count++; X ent = c; X#ifdef SIGNED_COMPARE_SLOW X if ( (unsigned) free_ent < (unsigned) maxmaxcode) { X#else X if ( free_ent < maxmaxcode ) { X#endif X codetabof (i) = free_ent++; /* code -> hashtable */ X htabof (i) = fcode; X } X else if ( (count_int)in_count >= checkpoint && block_compress ) X cl_block (); X } X /* X * Put out the final code. X */ X output( (code_int)ent ); X out_count++; X output( (code_int)-1 ); X X /* X * Print out stats on stderr X */ X if(zcat_flg == 0 && !quiet) { X#ifdef DEBUG X fprintf( stderr, X "%ld chars in, %ld codes (%ld bytes) out, compression factor: ", X in_count, out_count, bytes_out ); X prratio( stderr, in_count, bytes_out ); X fprintf( stderr, "\n"); X fprintf( stderr, "\tCompression as in compact: " ); X prratio( stderr, in_count-bytes_out, in_count ); X fprintf( stderr, "\n"); X fprintf( stderr, "\tLargest code (of last block) was %d (%d bits)\n", X free_ent - 1, n_bits ); X#else /* !DEBUG */ X fprintf( stderr, "Compression: " ); X prratio( stderr, in_count-bytes_out, in_count ); X#endif /* DEBUG */ X } X if(bytes_out > in_count) /* exit(2) if no savings */ X exit_stat = 2; X return; X} X X/***************************************************************** X * TAG( output ) X * X * Output the given code. X * Inputs: X * code: A n_bits-bit integer. If == -1, then EOF. This assumes X * that n_bits =< (long)wordsize - 1. X * Outputs: X * Outputs code to the file. X * Assumptions: X * Chars are 8 bits long. X * Algorithm: X * Maintain a BITS character long buffer (so that 8 codes will X * fit in it exactly). Use the VAX insv instruction to insert each X * code in turn. When the buffer fills up empty it and start over. X */ X Xstatic char buf[BITS]; X X#ifndef vax Xchar_type lmask[9] = {0xff, 0xfe, 0xfc, 0xf8, 0xf0, 0xe0, 0xc0, 0x80, 0x00}; Xchar_type rmask[9] = {0x00, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f, 0xff}; X#endif /* vax */ X Xoutput( code ) Xcode_int code; X{ X#ifdef DEBUG X static int col = 0; X#endif /* DEBUG */ X X /* X * On the VAX, it is important to have the register declarations X * in exactly the order given, or the asm will break. X */ X register int r_off = offset, bits= n_bits; X register char * bp = buf; X X#ifdef DEBUG X if ( verbose ) X fprintf( stderr, "%5d%c", code, X (col+=6) >= 74 ? (col = 0, '\n') : ' ' ); X#endif /* DEBUG */ X if ( code >= 0 ) { X#ifdef vax X /* VAX DEPENDENT!! Implementation on other machines is below. X * X * Translation: Insert BITS bits from the argument starting at X * offset bits from the beginning of buf. X */ X 0; /* Work around for pcc -O bug with asm and if stmt */ X asm( "insv 4(ap),r11,r10,(r9)" ); X#else /* not a vax */ X/* X * byte/bit numbering on the VAX is simulated by the following code X */ X /* X * Get to the first byte. X */ X bp += (r_off >> 3); X r_off &= 7; X /* X * Since code is always >= 8 bits, only need to mask the first X * hunk on the left. X */ X *bp = (*bp & rmask[r_off]) | (code << r_off) & lmask[r_off]; X bp++; X bits -= (8 - r_off); X code >>= 8 - r_off; X /* Get any 8 bit parts in the middle (<=1 for up to 16 bits). */ X if ( bits >= 8 ) { X *bp++ = code; X code >>= 8; X bits -= 8; X } X /* Last bits. */ X if(bits) X *bp = code; X#endif /* vax */ X offset += n_bits; X if ( offset == (n_bits << 3) ) { X bp = buf; X bits = n_bits; X bytes_out += bits; X do X putchar(*bp++); X while(--bits); X offset = 0; X } X X /* X * If the next entry is going to be too big for the code size, X * then increase it, if possible. X */ X if ( free_ent > maxcode || (clear_flg > 0)) X { X /* X * Write the whole buffer, because the input side won't X * discover the size increase until after it has read it. X */ X if ( offset > 0 ) { X if( fwrite( buf, 1, n_bits, stdout ) != n_bits) X writeerr(); X bytes_out += n_bits; X } X offset = 0; X X if ( clear_flg ) { X maxcode = MAXCODE (n_bits = INIT_BITS); X clear_flg = 0; X } X else { X n_bits++; X if ( n_bits == maxbits ) X maxcode = maxmaxcode; X else X maxcode = MAXCODE(n_bits); X } X#ifdef DEBUG X if ( debug ) { X fprintf( stderr, "\nChange to %d bits\n", n_bits ); X col = 0; X } X#endif /* DEBUG */ X } X } else { X /* X * At EOF, write the rest of the buffer. X */ X if ( offset > 0 ) X fwrite( buf, 1, (offset + 7) / 8, stdout ); X bytes_out += (offset + 7) / 8; X offset = 0; X fflush( stdout ); X#ifdef DEBUG X if ( verbose ) X fprintf( stderr, "\n" ); X#endif /* DEBUG */ X if( ferror( stdout ) ) X writeerr(); X } X} X X/* X * Decompress stdin to stdout. This routine adapts to the codes in the X * file building the "string" table on-the-fly; requiring no table to X * be stored in the compressed file. The tables used herein are shared X * with those of the compress() routine. See the definitions above. X */ X Xdecompress() { X register char_type *stackp; X register int finchar; X register code_int code, oldcode, incode; X X /* X * As above, initialize the first 256 entries in the table. X */ X maxcode = MAXCODE(n_bits = INIT_BITS); X for ( code = 255; code >= 0; code-- ) { X tab_prefixof(code) = 0; X tab_suffixof(code) = (char_type)code; X } X free_ent = ((block_compress) ? FIRST : 256 ); X X finchar = oldcode = getcode(); X if(oldcode == -1) /* EOF already? */ X return; /* Get out of here */ X putchar( (char)finchar ); /* first code must be 8 bits = char */ X if(ferror(stdout)) /* Crash if can't write */ X writeerr(); X stackp = de_stack; X X while ( (code = getcode()) > -1 ) { X X if ( (code == CLEAR) && block_compress ) { X for ( code = 255; code >= 0; code-- ) X tab_prefixof(code) = 0; X clear_flg = 1; X free_ent = FIRST - 1; X if ( (code = getcode ()) == -1 ) /* O, untimely death! */ X break; X } X incode = code; X /* X * Special case for KwKwK string. X */ X if ( code >= free_ent ) { X *stackp++ = finchar; X code = oldcode; X } X X /* X * Generate output characters in reverse order X */ X#ifdef SIGNED_COMPARE_SLOW X while ( ((unsigned long)code) >= ((unsigned long)256) ) { X#else X while ( code >= 256 ) { X#endif X *stackp++ = tab_suffixof(code); X code = tab_prefixof(code); X } X *stackp++ = finchar = tab_suffixof(code); X X /* X * And put them out in forward order X */ X do X putchar ( *--stackp ); X while ( stackp > de_stack ); X X /* X * Generate the new entry. X */ X if ( (code=free_ent) < maxmaxcode ) { X tab_prefixof(code) = (unsigned short)oldcode; X tab_suffixof(code) = finchar; X free_ent = code+1; X } X /* X * Remember previous code. X */ X oldcode = incode; X } X fflush( stdout ); X if(ferror(stdout)) X writeerr(); X} X X/***************************************************************** X * TAG( getcode ) X * X * Read one code from the standard input. If EOF, return -1. X * Inputs: X * stdin X * Outputs: X * code or -1 is returned. X */ X Xcode_int Xgetcode() { X /* X * On the VAX, it is important to have the register declarations X * in exactly the order given, or the asm will break. X */ X register code_int code; X static int offset = 0, size = 0; X static char_type buf[BITS]; X register int r_off, bits; X register char_type *bp = buf; X X if ( clear_flg > 0 || offset >= size || free_ent > maxcode ) { X /* X * If the next entry will be too big for the current code X * size, then we must increase the size. This implies reading X * a new buffer full, too. X */ X if ( free_ent > maxcode ) { X n_bits++; X if ( n_bits == maxbits ) X maxcode = maxmaxcode; /* won't get any bigger now */ X else X maxcode = MAXCODE(n_bits); X } X if ( clear_flg > 0) { X maxcode = MAXCODE (n_bits = INIT_BITS); X clear_flg = 0; X } X size = fread( buf, 1, n_bits, stdin ); X if ( size <= 0 ) X return -1; /* end of file */ X offset = 0; X /* Round size down to integral number of codes */ X size = (size << 3) - (n_bits - 1); X } X r_off = offset; X bits = n_bits; X#ifdef vax X asm( "extzv r10,r9,(r8),r11" ); X#else /* not a vax */ X /* X * Get to the first byte. X */ X bp += (r_off >> 3); X r_off &= 7; X /* Get first part (low order bits) */ X#ifdef NO_UCHAR X code = ((*bp++ >> r_off) & rmask[8 - r_off]) & 0xff; X#else X code = (*bp++ >> r_off); X#endif /* NO_UCHAR */ X bits -= (8 - r_off); X r_off = 8 - r_off; /* now, offset into code word */ X /* Get any 8 bit parts in the middle (<=1 for up to 16 bits). */ X if ( bits >= 8 ) { X#ifdef NO_UCHAR X code |= (*bp++ & 0xff) << r_off; X#else X code |= *bp++ << r_off; X#endif /* NO_UCHAR */ X r_off += 8; X bits -= 8; X } X /* high order bits. */ X code |= (*bp & rmask[bits]) << r_off; X#endif /* vax */ X offset += n_bits; X X return code; X} X Xchar * Xrindex(s, c) /* For those who don't have it in libc.a */ Xregister char *s, c; X{ X char *p; X for (p = NULL; *s; s++) X if (*s == c) X p = s; X return(p); X} X X#ifdef DEBUG Xprintcodes() X{ X /* X * Just print out codes from input file. For debugging. X */ X code_int code; X int col = 0, bits; X X bits = n_bits = INIT_BITS; X maxcode = MAXCODE(n_bits); X free_ent = ((block_compress) ? FIRST : 256 ); X while ( ( code = getcode() ) >= 0 ) { X if ( (code == CLEAR) && block_compress ) { X free_ent = FIRST - 1; X clear_flg = 1; X } X else if ( free_ent < maxmaxcode ) X free_ent++; X if ( bits != n_bits ) { X fprintf(stderr, "\nChange to %d bits\n", n_bits ); X bits = n_bits; X col = 0; X } X fprintf(stderr, "%5d%c", code, (col+=6) >= 74 ? (col = 0, '\n') : ' ' ); X } X putc( '\n', stderr ); X exit( 0 ); X} X Xcode_int sorttab[1<<BITS]; /* sorted pointers into htab */ X Xdump_tab() /* dump string table */ X{ X register int i, first; X register ent; X#define STACK_SIZE 15000 X int stack_top = STACK_SIZE; X register c; X X if(do_decomp == 0) { /* compressing */ X register int flag = 1; X X for(i=0; i<hsize; i++) { /* build sort pointers */ X if((long)htabof(i) >= 0) { X sorttab[codetabof(i)] = i; X } X } X first = block_compress ? FIRST : 256; X for(i = first; i < free_ent; i++) { X fprintf(stderr, "%5d: \"", i); X de_stack[--stack_top] = '\n'; X de_stack[--stack_top] = '"'; X stack_top = in_stack((htabof(sorttab[i])>>maxbits)&0xff, X stack_top); X for(ent=htabof(sorttab[i]) & ((1<<maxbits)-1); X ent > 256; X ent=htabof(sorttab[ent]) & ((1<<maxbits)-1)) { X stack_top = in_stack(htabof(sorttab[ent]) >> maxbits, X stack_top); X } X stack_top = in_stack(ent, stack_top); X fwrite( &de_stack[stack_top], 1, STACK_SIZE-stack_top, stderr); X stack_top = STACK_SIZE; X } X } else if(!debug) { /* decompressing */ X X for ( i = 0; i < free_ent; i++ ) { X ent = i; X c = tab_suffixof(ent); X if ( isascii(c) && isprint(c) ) X fprintf( stderr, "%5d: %5d/'%c' \"", X ent, tab_prefixof(ent), c ); X else X fprintf( stderr, "%5d: %5d/\\%03o \"", X ent, tab_prefixof(ent), c ); X de_stack[--stack_top] = '\n'; X de_stack[--stack_top] = '"'; X for ( ; ent != NULL; X ent = (ent >= FIRST ? tab_prefixof(ent) : NULL) ) { X stack_top = in_stack(tab_suffixof(ent), stack_top); X } X fwrite( &de_stack[stack_top], 1, STACK_SIZE - stack_top, stderr ); X stack_top = STACK_SIZE; X } X } X} X Xint Xin_stack(c, stack_top) X register c, stack_top; X{ X if ( (isascii(c) && isprint(c) && c != '\\') || c == ' ' ) { X de_stack[--stack_top] = c; X } else { X switch( c ) { X case '\n': de_stack[--stack_top] = 'n'; break; X case '\t': de_stack[--stack_top] = 't'; break; X case '\b': de_stack[--stack_top] = 'b'; break; X case '\f': de_stack[--stack_top] = 'f'; break; X case '\r': de_stack[--stack_top] = 'r'; break; X case '\\': de_stack[--stack_top] = '\\'; break; X default: X de_stack[--stack_top] = '0' + c % 8; X de_stack[--stack_top] = '0' + (c / 8) % 8; X de_stack[--stack_top] = '0' + c / 64; X break; X } X de_stack[--stack_top] = '\\'; X } X return stack_top; X} X#endif /* DEBUG */ X Xwriteerr() X{ X perror ( ofname ); X unlink ( ofname ); X exit ( 1 ); X} X Xcopystat(ifname, ofname) Xchar *ifname, *ofname; X{ X struct stat statbuf; X int mode; X time_t timep[2]; X X fclose(stdout); X if (stat(ifname, &statbuf)) { /* Get stat on input file */ X perror(ifname); X return; X } X if ((statbuf.st_mode & S_IFMT/*0170000*/) != S_IFREG/*0100000*/) { X if(quiet) X fprintf(stderr, "%s: ", ifname); X fprintf(stderr, " -- not a regular file: unchanged"); X exit_stat = 1; X } else if (statbuf.st_nlink > 1) { X if(quiet) X fprintf(stderr, "%s: ", ifname); X fprintf(stderr, " -- has %d other links: unchanged", X statbuf.st_nlink - 1); X exit_stat = 1; X } else if (exit_stat == 2 && (!force)) { /* No compression: remove file.Z */ X if(!quiet) X fprintf(stderr, " -- file unchanged"); X } else { /* ***** Successful Compression ***** */ X exit_stat = 0; X mode = statbuf.st_mode & 07777; X if (chmod(ofname, mode)) /* Copy modes */ X perror(ofname); X chown(ofname, statbuf.st_uid, statbuf.st_gid); /* Copy ownership */ X timep[0] = statbuf.st_atime; X timep[1] = statbuf.st_mtime; X utime(ofname, timep); /* Update last accessed and modified times */ X if (unlink(ifname)) /* Remove input file */ X perror(ifname); X if(!quiet) X fprintf(stderr, " -- replaced with %s", ofname); X return; /* Successful return */ X } X X /* Unsuccessful return -- one of the tests failed */ X if (unlink(ofname)) X perror(ofname); X} X/* X * This routine returns 1 if we are running in the foreground and stderr X * is a tty. X */ Xforeground() X{ X if(bgnd_flag) { /* background? */ X return(0); X } else { /* foreground */ X if(isatty(2)) { /* and stderr is a tty */ X return(1); X } else { X return(0); X } X } X} X Xonintr ( ) X{ X unlink ( ofname ); X exit ( 1 ); X} X Xoops ( ) /* wild pointer -- assume bad input */ X{ X if ( do_decomp == 1 ) X fprintf ( stderr, "uncompress: corrupt input\n" ); X unlink ( ofname ); X exit ( 1 ); X} X Xcl_block () /* table clear for block compress */ X{ X register long int rat; X X checkpoint = in_count + CHECK_GAP; X#ifdef DEBUG X if ( debug ) { X fprintf ( stderr, "count: %ld, ratio: ", in_count ); X prratio ( stderr, in_count, bytes_out ); X fprintf ( stderr, "\n"); X } X#endif /* DEBUG */ X X if(in_count > 0x007fffff) { /* shift will overflow */ X rat = bytes_out >> 8; X if(rat == 0) { /* Don't divide by zero */ X rat = 0x7fffffff; X } else { X rat = in_count / rat; X } X } else { X rat = (in_count << 8) / bytes_out; /* 8 fractional bits */ X } X if ( rat > ratio ) { X ratio = rat; X } else { X ratio = 0; X#ifdef DEBUG X if(verbose) X dump_tab(); /* dump string table */ X#endif X cl_hash ( (count_int) hsize ); X free_ent = FIRST; X clear_flg = 1; X output ( (code_int) CLEAR ); X#ifdef DEBUG X if(debug) X fprintf ( stderr, "clear\n" ); X#endif /* DEBUG */ X } X} X Xcl_hash(hsize) /* reset code table */ X register count_int hsize; X{ X#ifndef XENIX_16 /* Normal machine */ X register count_int *htab_p = htab+hsize; X#else X register j; X register long k = hsize; X register count_int *htab_p; X#endif X register long i; X register long m1 = -1; X X#ifdef XENIX_16 X for(j=0; j<=8 && k>=0; j++,k-=8192) { X i = 8192; X if(k < 8192) { X i = k; X } X htab_p = &(htab[j][i]); X i -= 16; X if(i > 0) { X#else X i = hsize - 16; X#endif X do { /* might use Sys V memset(3) here */ X *(htab_p-16) = m1; X *(htab_p-15) = m1; X *(htab_p-14) = m1; X *(htab_p-13) = m1; X *(htab_p-12) = m1; X *(htab_p-11) = m1; X *(htab_p-10) = m1; X *(htab_p-9) = m1; X *(htab_p-8) = m1; X *(htab_p-7) = m1; X *(htab_p-6) = m1; X *(htab_p-5) = m1; X *(htab_p-4) = m1; X *(htab_p-3) = m1; X *(htab_p-2) = m1; X *(htab_p-1) = m1; X htab_p -= 16; X } while ((i -= 16) >= 0); X#ifdef XENIX_16 X } X } X#endif X for ( i += 16; i > 0; i-- ) X *--htab_p = m1; X} X Xprratio(stream, num, den) XFILE *stream; Xlong int num, den; X{ X register int q; /* Doesn't need to be long */ X X if(num > 214748L) { /* 2147483647/10000 */ X q = num / (den / 10000L); X } else { X q = 10000L * num / den; /* Long calculations, though */ X } X if (q < 0) { X putc('-', stream); X q = -q; X } X fprintf(stream, "%d.%02d%%", q / 100, q % 100); X} X Xversion() X{ X fprintf(stderr, "%s\n", rcs_ident); X fprintf(stderr, "Options: "); X#ifdef vax X fprintf(stderr, "vax, "); X#endif X#ifdef NO_UCHAR X fprintf(stderr, "NO_UCHAR, "); X#endif X#ifdef SIGNED_COMPARE_SLOW X fprintf(stderr, "SIGNED_COMPARE_SLOW, "); X#endif X#ifdef XENIX_16 X fprintf(stderr, "XENIX_16, "); X#endif X#ifdef COMPATIBLE X fprintf(stderr, "COMPATIBLE, "); X#endif X#ifdef DEBUG X fprintf(stderr, "DEBUG, "); X#endif X#ifdef BSD4_2 X fprintf(stderr, "BSD4_2, "); X#endif X fprintf(stderr, "BITS = %d\n", BITS); X} FRIDAY_NIGHT
ger@qtecmuc.UUCP (07/14/87)
> I was also wondering if > people want to compress stuff to post, why don't they use ARC or PKARC > which most people have and has been posted to the net numerous time > > Leon I agree with you. There is alraedy enough confusion with ARC and PKARC, so please use one of those. BTW, could some kind soul mail me an uuencoded copy of PKARC (and maybe COMPRESS), since we don't get comp.binaries.ibm.pc here in W-Germany. Thanks ! Gerhard Pehland UUCP: ...!seismo!unido!qtecmuc!ger