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Annotation of 43BSD/ucb/compress/compress.c, revision 1.1

1.1     ! root        1: #ifndef lint
        !             2: static char sccsid[] = "@(#)compress.c @(#)compress.c  5.9 (Berkeley) 5/11/86";
        !             3: #endif not lint
        !             4: 
        !             5: /* 
        !             6:  * Compress - data compression program 
        !             7:  */
        !             8: #define        min(a,b)        ((a>b) ? b : a)
        !             9: 
        !            10: /*
        !            11:  * machine variants which require cc -Dmachine:  pdp11, z8000, pcxt
        !            12:  */
        !            13: 
        !            14: /*
        !            15:  * Set USERMEM to the maximum amount of physical user memory available
        !            16:  * in bytes.  USERMEM is used to determine the maximum BITS that can be used
        !            17:  * for compression.
        !            18:  *
        !            19:  * SACREDMEM is the amount of physical memory saved for others; compress
        !            20:  * will hog the rest.
        !            21:  */
        !            22: #ifndef SACREDMEM
        !            23: #define SACREDMEM      0
        !            24: #endif
        !            25: 
        !            26: #ifndef USERMEM
        !            27: # define USERMEM       450000  /* default user memory */
        !            28: #endif
        !            29: 
        !            30: #ifdef interdata               /* (Perkin-Elmer) */
        !            31: #define SIGNED_COMPARE_SLOW    /* signed compare is slower than unsigned */
        !            32: #endif
        !            33: 
        !            34: #ifdef pdp11
        !            35: # define BITS  12      /* max bits/code for 16-bit machine */
        !            36: # define NO_UCHAR      /* also if "unsigned char" functions as signed char */
        !            37: # undef USERMEM 
        !            38: #endif /* pdp11 */     /* don't forget to compile with -i */
        !            39: 
        !            40: #ifdef z8000
        !            41: # define BITS  12
        !            42: # undef vax            /* weird preprocessor */
        !            43: # undef USERMEM 
        !            44: #endif /* z8000 */
        !            45: 
        !            46: #ifdef pcxt
        !            47: # define BITS   12
        !            48: # undef USERMEM
        !            49: #endif /* pcxt */
        !            50: 
        !            51: #ifdef USERMEM
        !            52: # if USERMEM >= (433484+SACREDMEM)
        !            53: #  define PBITS        16
        !            54: # else
        !            55: #  if USERMEM >= (229600+SACREDMEM)
        !            56: #   define PBITS       15
        !            57: #  else
        !            58: #   if USERMEM >= (127536+SACREDMEM)
        !            59: #    define PBITS      14
        !            60: #   else
        !            61: #    if USERMEM >= (73464+SACREDMEM)
        !            62: #     define PBITS     13
        !            63: #    else
        !            64: #     define PBITS     12
        !            65: #    endif
        !            66: #   endif
        !            67: #  endif
        !            68: # endif
        !            69: # undef USERMEM
        !            70: #endif /* USERMEM */
        !            71: 
        !            72: #ifdef PBITS           /* Preferred BITS for this memory size */
        !            73: # ifndef BITS
        !            74: #  define BITS PBITS
        !            75: # endif BITS
        !            76: #endif /* PBITS */
        !            77: 
        !            78: #if BITS == 16
        !            79: # define HSIZE 69001           /* 95% occupancy */
        !            80: #endif
        !            81: #if BITS == 15
        !            82: # define HSIZE 35023           /* 94% occupancy */
        !            83: #endif
        !            84: #if BITS == 14
        !            85: # define HSIZE 18013           /* 91% occupancy */
        !            86: #endif
        !            87: #if BITS == 13
        !            88: # define HSIZE 9001            /* 91% occupancy */
        !            89: #endif
        !            90: #if BITS <= 12
        !            91: # define HSIZE 5003            /* 80% occupancy */
        !            92: #endif
        !            93: 
        !            94: #ifdef M_XENIX                 /* Stupid compiler can't handle arrays with */
        !            95: # if BITS == 16                        /* more than 65535 bytes - so we fake it */
        !            96: #  define XENIX_16
        !            97: # else
        !            98: #  if BITS > 13                        /* Code only handles BITS = 12, 13, or 16 */
        !            99: #   define BITS        13
        !           100: #  endif
        !           101: # endif
        !           102: #endif
        !           103: 
        !           104: /*
        !           105:  * a code_int must be able to hold 2**BITS values of type int, and also -1
        !           106:  */
        !           107: #if BITS > 15
        !           108: typedef long int       code_int;
        !           109: #else
        !           110: typedef int            code_int;
        !           111: #endif
        !           112: 
        !           113: #ifdef SIGNED_COMPARE_SLOW
        !           114: typedef unsigned long int count_int;
        !           115: typedef unsigned short int count_short;
        !           116: #else
        !           117: typedef long int         count_int;
        !           118: #endif
        !           119: 
        !           120: #ifdef NO_UCHAR
        !           121:  typedef char  char_type;
        !           122: #else
        !           123:  typedef       unsigned char   char_type;
        !           124: #endif /* UCHAR */
        !           125: char_type magic_header[] = { "\037\235" };     /* 1F 9D */
        !           126: 
        !           127: /* Defines for third byte of header */
        !           128: #define BIT_MASK       0x1f
        !           129: #define BLOCK_MASK     0x80
        !           130: /* Masks 0x40 and 0x20 are free.  I think 0x20 should mean that there is
        !           131:    a fourth header byte (for expansion).
        !           132: */
        !           133: #define INIT_BITS 9                    /* initial number of bits/code */
        !           134: 
        !           135: /*
        !           136:  * compress.c - File compression ala IEEE Computer, June 1984.
        !           137:  *
        !           138:  * Authors:    Spencer W. Thomas       (decvax!utah-cs!thomas)
        !           139:  *             Jim McKie               (decvax!mcvax!jim)
        !           140:  *             Steve Davies            (decvax!vax135!petsd!peora!srd)
        !           141:  *             Ken Turkowski           (decvax!decwrl!turtlevax!ken)
        !           142:  *             James A. Woods          (decvax!ihnp4!ames!jaw)
        !           143:  *             Joe Orost               (decvax!vax135!petsd!joe)
        !           144:  *
        !           145:  * $Header: compress.c,v 4.0 85/07/30 12:50:00 joe Release $
        !           146:  * $Log:       compress.c,v $
        !           147:  * Revision 4.0  85/07/30  12:50:00  joe
        !           148:  * Removed ferror() calls in output routine on every output except first.
        !           149:  * Prepared for release to the world.
        !           150:  * 
        !           151:  * Revision 3.6  85/07/04  01:22:21  joe
        !           152:  * Remove much wasted storage by overlaying hash table with the tables
        !           153:  * used by decompress: tab_suffix[1<<BITS], stack[8000].  Updated USERMEM
        !           154:  * computations.  Fixed dump_tab() DEBUG routine.
        !           155:  *
        !           156:  * Revision 3.5  85/06/30  20:47:21  jaw
        !           157:  * Change hash function to use exclusive-or.  Rip out hash cache.  These
        !           158:  * speedups render the megamemory version defunct, for now.  Make decoder
        !           159:  * stack global.  Parts of the RCS trunks 2.7, 2.6, and 2.1 no longer apply.
        !           160:  *
        !           161:  * Revision 3.4  85/06/27  12:00:00  ken
        !           162:  * Get rid of all floating-point calculations by doing all compression ratio
        !           163:  * calculations in fixed point.
        !           164:  *
        !           165:  * Revision 3.3  85/06/24  21:53:24  joe
        !           166:  * Incorporate portability suggestion for M_XENIX.  Got rid of text on #else
        !           167:  * and #endif lines.  Cleaned up #ifdefs for vax and interdata.
        !           168:  *
        !           169:  * Revision 3.2  85/06/06  21:53:24  jaw
        !           170:  * Incorporate portability suggestions for Z8000, IBM PC/XT from mailing list.
        !           171:  * Default to "quiet" output (no compression statistics).
        !           172:  *
        !           173:  * Revision 3.1  85/05/12  18:56:13  jaw
        !           174:  * Integrate decompress() stack speedups (from early pointer mods by McKie).
        !           175:  * Repair multi-file USERMEM gaffe.  Unify 'force' flags to mimic semantics
        !           176:  * of SVR2 'pack'.  Streamline block-compress table clear logic.  Increase 
        !           177:  * output byte count by magic number size.
        !           178:  * 
        !           179:  * Revision 3.0   84/11/27  11:50:00  petsd!joe
        !           180:  * Set HSIZE depending on BITS.  Set BITS depending on USERMEM.  Unrolled
        !           181:  * loops in clear routines.  Added "-C" flag for 2.0 compatibility.  Used
        !           182:  * unsigned compares on Perkin-Elmer.  Fixed foreground check.
        !           183:  *
        !           184:  * Revision 2.7   84/11/16  19:35:39  ames!jaw
        !           185:  * Cache common hash codes based on input statistics; this improves
        !           186:  * performance for low-density raster images.  Pass on #ifdef bundle
        !           187:  * from Turkowski.
        !           188:  *
        !           189:  * Revision 2.6   84/11/05  19:18:21  ames!jaw
        !           190:  * Vary size of hash tables to reduce time for small files.
        !           191:  * Tune PDP-11 hash function.
        !           192:  *
        !           193:  * Revision 2.5   84/10/30  20:15:14  ames!jaw
        !           194:  * Junk chaining; replace with the simpler (and, on the VAX, faster)
        !           195:  * double hashing, discussed within.  Make block compression standard.
        !           196:  *
        !           197:  * Revision 2.4   84/10/16  11:11:11  ames!jaw
        !           198:  * Introduce adaptive reset for block compression, to boost the rate
        !           199:  * another several percent.  (See mailing list notes.)
        !           200:  *
        !           201:  * Revision 2.3   84/09/22  22:00:00  petsd!joe
        !           202:  * Implemented "-B" block compress.  Implemented REVERSE sorting of tab_next.
        !           203:  * Bug fix for last bits.  Changed fwrite to putchar loop everywhere.
        !           204:  *
        !           205:  * Revision 2.2   84/09/18  14:12:21  ames!jaw
        !           206:  * Fold in news changes, small machine typedef from thomas,
        !           207:  * #ifdef interdata from joe.
        !           208:  *
        !           209:  * Revision 2.1   84/09/10  12:34:56  ames!jaw
        !           210:  * Configured fast table lookup for 32-bit machines.
        !           211:  * This cuts user time in half for b <= FBITS, and is useful for news batching
        !           212:  * from VAX to PDP sites.  Also sped up decompress() [fwrite->putc] and
        !           213:  * added signal catcher [plus beef in writeerr()] to delete effluvia.
        !           214:  *
        !           215:  * Revision 2.0   84/08/28  22:00:00  petsd!joe
        !           216:  * Add check for foreground before prompting user.  Insert maxbits into
        !           217:  * compressed file.  Force file being uncompressed to end with ".Z".
        !           218:  * Added "-c" flag and "zcat".  Prepared for release.
        !           219:  *
        !           220:  * Revision 1.10  84/08/24  18:28:00  turtlevax!ken
        !           221:  * Will only compress regular files (no directories), added a magic number
        !           222:  * header (plus an undocumented -n flag to handle old files without headers),
        !           223:  * added -f flag to force overwriting of possibly existing destination file,
        !           224:  * otherwise the user is prompted for a response.  Will tack on a .Z to a
        !           225:  * filename if it doesn't have one when decompressing.  Will only replace
        !           226:  * file if it was compressed.
        !           227:  *
        !           228:  * Revision 1.9  84/08/16  17:28:00  turtlevax!ken
        !           229:  * Removed scanargs(), getopt(), added .Z extension and unlimited number of
        !           230:  * filenames to compress.  Flags may be clustered (-Ddvb12) or separated
        !           231:  * (-D -d -v -b 12), or combination thereof.  Modes and other status is
        !           232:  * copied with copystat().  -O bug for 4.2 seems to have disappeared with
        !           233:  * 1.8.
        !           234:  *
        !           235:  * Revision 1.8  84/08/09  23:15:00  joe
        !           236:  * Made it compatible with vax version, installed jim's fixes/enhancements
        !           237:  *
        !           238:  * Revision 1.6  84/08/01  22:08:00  joe
        !           239:  * Sped up algorithm significantly by sorting the compress chain.
        !           240:  *
        !           241:  * Revision 1.5  84/07/13  13:11:00  srd
        !           242:  * Added C version of vax asm routines.  Changed structure to arrays to
        !           243:  * save much memory.  Do unsigned compares where possible (faster on
        !           244:  * Perkin-Elmer)
        !           245:  *
        !           246:  * Revision 1.4  84/07/05  03:11:11  thomas
        !           247:  * Clean up the code a little and lint it.  (Lint complains about all
        !           248:  * the regs used in the asm, but I'm not going to "fix" this.)
        !           249:  *
        !           250:  * Revision 1.3  84/07/05  02:06:54  thomas
        !           251:  * Minor fixes.
        !           252:  *
        !           253:  * Revision 1.2  84/07/05  00:27:27  thomas
        !           254:  * Add variable bit length output.
        !           255:  *
        !           256:  */
        !           257: static char rcs_ident[] = "$Header: compress.c,v 4.0 85/07/30 12:50:00 joe Release $";
        !           258: 
        !           259: #include <stdio.h>
        !           260: #include <ctype.h>
        !           261: #include <signal.h>
        !           262: #include <sys/types.h>
        !           263: #include <sys/stat.h>
        !           264: #ifdef notdef
        !           265: #include <sys/ioctl.h>
        !           266: #endif
        !           267: 
        !           268: #define ARGVAL() (*++(*argv) || (--argc && *++argv))
        !           269: 
        !           270: int n_bits;                            /* number of bits/code */
        !           271: int maxbits = BITS;                    /* user settable max # bits/code */
        !           272: code_int maxcode;                      /* maximum code, given n_bits */
        !           273: code_int maxmaxcode = 1 << BITS;       /* should NEVER generate this code */
        !           274: #ifdef COMPATIBLE              /* But wrong! */
        !           275: # define MAXCODE(n_bits)       (1 << (n_bits) - 1)
        !           276: #else
        !           277: # define MAXCODE(n_bits)       ((1 << (n_bits)) - 1)
        !           278: #endif /* COMPATIBLE */
        !           279: 
        !           280: #ifdef XENIX_16
        !           281: count_int htab0[8192];
        !           282: count_int htab1[8192];
        !           283: count_int htab2[8192];
        !           284: count_int htab3[8192];
        !           285: count_int htab4[8192];
        !           286: count_int htab5[8192];
        !           287: count_int htab6[8192];
        !           288: count_int htab7[8192];
        !           289: count_int htab8[HSIZE-65536];
        !           290: count_int * htab[9] = {
        !           291:        htab0, htab1, htab2, htab3, htab4, htab5, htab6, htab7, htab8 };
        !           292: 
        !           293: #define htabof(i)      (htab[(i) >> 13][(i) & 0x1fff])
        !           294: unsigned short code0tab[16384];
        !           295: unsigned short code1tab[16384];
        !           296: unsigned short code2tab[16384];
        !           297: unsigned short code3tab[16384];
        !           298: unsigned short code4tab[16384];
        !           299: unsigned short * codetab[5] = {
        !           300:        code0tab, code1tab, code2tab, code3tab, code4tab };
        !           301: 
        !           302: #define codetabof(i)   (codetab[(i) >> 14][(i) & 0x3fff])
        !           303: 
        !           304: #else  /* Normal machine */
        !           305: 
        !           306: #ifdef sel     /* gould base register braindamage */
        !           307: /*NOBASE*/
        !           308: count_int htab [HSIZE];
        !           309: unsigned short codetab [HSIZE];
        !           310: /*NOBASE*/
        !           311: #else
        !           312: count_int htab [HSIZE];
        !           313: unsigned short codetab [HSIZE];
        !           314: #endif sel
        !           315: 
        !           316: #define htabof(i)      htab[i]
        !           317: #define codetabof(i)   codetab[i]
        !           318: #endif /* XENIX_16 */
        !           319: code_int hsize = HSIZE;                        /* for dynamic table sizing */
        !           320: count_int fsize;
        !           321: 
        !           322: /*
        !           323:  * To save much memory, we overlay the table used by compress() with those
        !           324:  * used by decompress().  The tab_prefix table is the same size and type
        !           325:  * as the codetab.  The tab_suffix table needs 2**BITS characters.  We
        !           326:  * get this from the beginning of htab.  The output stack uses the rest
        !           327:  * of htab, and contains characters.  There is plenty of room for any
        !           328:  * possible stack (stack used to be 8000 characters).
        !           329:  */
        !           330: 
        !           331: #define tab_prefixof(i)        codetabof(i)
        !           332: #ifdef XENIX_16
        !           333: # define tab_suffixof(i)       ((char_type *)htab[(i)>>15])[(i) & 0x7fff]
        !           334: # define de_stack              ((char_type *)(htab2))
        !           335: #else  /* Normal machine */
        !           336: # define tab_suffixof(i)       ((char_type *)(htab))[i]
        !           337: # define de_stack              ((char_type *)&tab_suffixof(1<<BITS))
        !           338: #endif /* XENIX_16 */
        !           339: 
        !           340: code_int free_ent = 0;                 /* first unused entry */
        !           341: int exit_stat = 0;                     /* per-file status */
        !           342: int perm_stat = 0;                     /* permanent status */
        !           343: 
        !           344: code_int getcode();
        !           345: 
        !           346: Usage() {
        !           347: #ifdef DEBUG
        !           348: fprintf(stderr,"Usage: compress [-dDVfc] [-b maxbits] [file ...]\n");
        !           349: }
        !           350: int debug = 0;
        !           351: #else
        !           352: fprintf(stderr,"Usage: compress [-fvc] [-b maxbits] [file ...]\n");
        !           353: }
        !           354: #endif /* DEBUG */
        !           355: int nomagic = 0;       /* Use a 3-byte magic number header, unless old file */
        !           356: int zcat_flg = 0;      /* Write output on stdout, suppress messages */
        !           357: int precious = 1;      /* Don't unlink output file on interrupt */
        !           358: int quiet = 1;         /* don't tell me about compression */
        !           359: 
        !           360: /*
        !           361:  * block compression parameters -- after all codes are used up,
        !           362:  * and compression rate changes, start over.
        !           363:  */
        !           364: int block_compress = BLOCK_MASK;
        !           365: int clear_flg = 0;
        !           366: long int ratio = 0;
        !           367: #define CHECK_GAP 10000        /* ratio check interval */
        !           368: count_int checkpoint = CHECK_GAP;
        !           369: /*
        !           370:  * the next two codes should not be changed lightly, as they must not
        !           371:  * lie within the contiguous general code space.
        !           372:  */ 
        !           373: #define FIRST  257     /* first free entry */
        !           374: #define        CLEAR   256     /* table clear output code */
        !           375: 
        !           376: int force = 0;
        !           377: char ofname [100];
        !           378: #ifdef DEBUG
        !           379: int verbose = 0;
        !           380: #endif /* DEBUG */
        !           381: int (*oldint)();
        !           382: int bgnd_flag;
        !           383: 
        !           384: int do_decomp = 0;
        !           385: 
        !           386: /*****************************************************************
        !           387:  * TAG( main )
        !           388:  *
        !           389:  * Algorithm from "A Technique for High Performance Data Compression",
        !           390:  * Terry A. Welch, IEEE Computer Vol 17, No 6 (June 1984), pp 8-19.
        !           391:  *
        !           392:  * Usage: compress [-dfvc] [-b bits] [file ...]
        !           393:  * Inputs:
        !           394:  *     -d:         If given, decompression is done instead.
        !           395:  *
        !           396:  *      -c:         Write output on stdout, don't remove original.
        !           397:  *
        !           398:  *      -b:         Parameter limits the max number of bits/code.
        !           399:  *
        !           400:  *     -f:         Forces output file to be generated, even if one already
        !           401:  *                 exists, and even if no space is saved by compressing.
        !           402:  *                 If -f is not used, the user will be prompted if stdin is
        !           403:  *                 a tty, otherwise, the output file will not be overwritten.
        !           404:  *
        !           405:  *      -v:        Write compression statistics
        !           406:  *
        !           407:  *     file ...:   Files to be compressed.  If none specified, stdin
        !           408:  *                 is used.
        !           409:  * Outputs:
        !           410:  *     file.Z:     Compressed form of file with same mode, owner, and utimes
        !           411:  *     or stdout   (if stdin used as input)
        !           412:  *
        !           413:  * Assumptions:
        !           414:  *     When filenames are given, replaces with the compressed version
        !           415:  *     (.Z suffix) only if the file decreases in size.
        !           416:  * Algorithm:
        !           417:  *     Modified Lempel-Ziv method (LZW).  Basically finds common
        !           418:  * substrings and replaces them with a variable size code.  This is
        !           419:  * deterministic, and can be done on the fly.  Thus, the decompression
        !           420:  * procedure needs no input table, but tracks the way the table was built.
        !           421:  */
        !           422: 
        !           423: main( argc, argv )
        !           424: register int argc; char **argv;
        !           425: {
        !           426:     int overwrite = 0; /* Do not overwrite unless given -f flag */
        !           427:     char tempname[100];
        !           428:     char **filelist, **fileptr;
        !           429:     char *cp, *rindex(), *malloc();
        !           430:     struct stat statbuf;
        !           431:     extern onintr(), oops();
        !           432: 
        !           433:     /* This bg check only works for sh. */
        !           434:     if ( (oldint = signal ( SIGINT, SIG_IGN )) != SIG_IGN ) {
        !           435:        signal ( SIGINT, onintr );
        !           436:        signal ( SIGSEGV, oops );
        !           437:     }
        !           438:     bgnd_flag = oldint != SIG_DFL;
        !           439: #ifdef notdef     /* This works for csh but we don't want it. */
        !           440:     { int tgrp;
        !           441:     if (bgnd_flag == 0 && ioctl(2, TIOCGPGRP, (char *)&tgrp) == 0 &&
        !           442:       getpgrp(0) != tgrp)
        !           443:        bgnd_flag = 1;
        !           444:     }
        !           445: #endif
        !           446:     
        !           447: #ifdef COMPATIBLE
        !           448:     nomagic = 1;       /* Original didn't have a magic number */
        !           449: #endif /* COMPATIBLE */
        !           450: 
        !           451:     filelist = fileptr = (char **)(malloc(argc * sizeof(*argv)));
        !           452:     *filelist = NULL;
        !           453: 
        !           454:     if((cp = rindex(argv[0], '/')) != 0) {
        !           455:        cp++;
        !           456:     } else {
        !           457:        cp = argv[0];
        !           458:     }
        !           459:     if(strcmp(cp, "uncompress") == 0) {
        !           460:        do_decomp = 1;
        !           461:     } else if(strcmp(cp, "zcat") == 0) {
        !           462:        do_decomp = 1;
        !           463:        zcat_flg = 1;
        !           464:     }
        !           465: 
        !           466: #ifdef BSD4_2
        !           467:     /* 4.2BSD dependent - take it out if not */
        !           468:     setlinebuf( stderr );
        !           469: #endif /* BSD4_2 */
        !           470: 
        !           471:     /* Argument Processing
        !           472:      * All flags are optional.
        !           473:      * -D => debug
        !           474:      * -V => print Version; debug verbose
        !           475:      * -d => do_decomp
        !           476:      * -v => unquiet
        !           477:      * -f => force overwrite of output file
        !           478:      * -n => no header: useful to uncompress old files
        !           479:      * -b maxbits => maxbits.  If -b is specified, then maxbits MUST be
        !           480:      *     given also.
        !           481:      * -c => cat all output to stdout
        !           482:      * -C => generate output compatible with compress 2.0.
        !           483:      * if a string is left, must be an input filename.
        !           484:      */
        !           485:     for (argc--, argv++; argc > 0; argc--, argv++) {
        !           486:        if (**argv == '-') {    /* A flag argument */
        !           487:            while (*++(*argv)) {        /* Process all flags in this arg */
        !           488:                switch (**argv) {
        !           489: #ifdef DEBUG
        !           490:                    case 'D':
        !           491:                        debug = 1;
        !           492:                        break;
        !           493:                    case 'V':
        !           494:                        verbose = 1;
        !           495:                        version();
        !           496:                        break;
        !           497: #else
        !           498:                    case 'V':
        !           499:                        version();
        !           500:                        break;
        !           501: #endif /* DEBUG */
        !           502:                    case 'v':
        !           503:                        quiet = 0;
        !           504:                        break;
        !           505:                    case 'd':
        !           506:                        do_decomp = 1;
        !           507:                        break;
        !           508:                    case 'f':
        !           509:                    case 'F':
        !           510:                        overwrite = 1;
        !           511:                        force = 1;
        !           512:                        break;
        !           513:                    case 'n':
        !           514:                        nomagic = 1;
        !           515:                        break;
        !           516:                    case 'C':
        !           517:                        block_compress = 0;
        !           518:                        break;
        !           519:                    case 'b':
        !           520:                        if (!ARGVAL()) {
        !           521:                            fprintf(stderr, "Missing maxbits\n");
        !           522:                            Usage();
        !           523:                            exit(1);
        !           524:                        }
        !           525:                        maxbits = atoi(*argv);
        !           526:                        goto nextarg;
        !           527:                    case 'c':
        !           528:                        zcat_flg = 1;
        !           529:                        break;
        !           530:                    case 'q':
        !           531:                        quiet = 1;
        !           532:                        break;
        !           533:                    default:
        !           534:                        fprintf(stderr, "Unknown flag: '%c'; ", **argv);
        !           535:                        Usage();
        !           536:                        exit(1);
        !           537:                }
        !           538:            }
        !           539:        }
        !           540:        else {          /* Input file name */
        !           541:            *fileptr++ = *argv; /* Build input file list */
        !           542:            *fileptr = NULL;
        !           543:            /* process nextarg; */
        !           544:        }
        !           545:        nextarg: continue;
        !           546:     }
        !           547: 
        !           548:     if(maxbits < INIT_BITS) maxbits = INIT_BITS;
        !           549:     if (maxbits > BITS) maxbits = BITS;
        !           550:     maxmaxcode = 1 << maxbits;
        !           551: 
        !           552:     if (*filelist != NULL) {
        !           553:        for (fileptr = filelist; *fileptr; fileptr++) {
        !           554:            exit_stat = 0;
        !           555:            if (do_decomp) {                    /* DECOMPRESSION */
        !           556:                /* Check for .Z suffix */
        !           557:                if (strcmp(*fileptr + strlen(*fileptr) - 2, ".Z") != 0) {
        !           558:                    /* No .Z: tack one on */
        !           559:                    strcpy(tempname, *fileptr);
        !           560:                    strcat(tempname, ".Z");
        !           561:                    *fileptr = tempname;
        !           562:                }
        !           563:                /* Open input file */
        !           564:                if ((freopen(*fileptr, "r", stdin)) == NULL) {
        !           565:                    perror(*fileptr);
        !           566:                    perm_stat = 1;
        !           567:                    continue;
        !           568:                }
        !           569:                /* Check the magic number */
        !           570:                if (nomagic == 0) {
        !           571:                    if ((getchar() != (magic_header[0] & 0xFF))
        !           572:                     || (getchar() != (magic_header[1] & 0xFF))) {
        !           573:                        fprintf(stderr, "%s: not in compressed format\n",
        !           574:                            *fileptr);
        !           575:                    continue;
        !           576:                    }
        !           577:                    maxbits = getchar();        /* set -b from file */
        !           578:                    block_compress = maxbits & BLOCK_MASK;
        !           579:                    maxbits &= BIT_MASK;
        !           580:                    maxmaxcode = 1 << maxbits;
        !           581:                    if(maxbits > BITS) {
        !           582:                        fprintf(stderr,
        !           583:                        "%s: compressed with %d bits, can only handle %d bits\n",
        !           584:                        *fileptr, maxbits, BITS);
        !           585:                        continue;
        !           586:                    }
        !           587:                }
        !           588:                /* Generate output filename */
        !           589:                strcpy(ofname, *fileptr);
        !           590:                ofname[strlen(*fileptr) - 2] = '\0';  /* Strip off .Z */
        !           591:            } else {                                    /* COMPRESSION */
        !           592:                if (strcmp(*fileptr + strlen(*fileptr) - 2, ".Z") == 0) {
        !           593:                        fprintf(stderr, "%s: already has .Z suffix -- no change\n",
        !           594:                            *fileptr);
        !           595:                    continue;
        !           596:                }
        !           597:                /* Open input file */
        !           598:                if ((freopen(*fileptr, "r", stdin)) == NULL) {
        !           599:                    perror(*fileptr);
        !           600:                    perm_stat = 1;
        !           601:                    continue;
        !           602:                }
        !           603:                stat ( *fileptr, &statbuf );
        !           604:                fsize = (long) statbuf.st_size;
        !           605:                /*
        !           606:                 * tune hash table size for small files -- ad hoc,
        !           607:                 * but the sizes match earlier #defines, which
        !           608:                 * serve as upper bounds on the number of output codes. 
        !           609:                 */
        !           610:                hsize = HSIZE;
        !           611:                if ( fsize < (1 << 12) )
        !           612:                    hsize = min ( 5003, HSIZE );
        !           613:                else if ( fsize < (1 << 13) )
        !           614:                    hsize = min ( 9001, HSIZE );
        !           615:                else if ( fsize < (1 << 14) )
        !           616:                    hsize = min ( 18013, HSIZE );
        !           617:                else if ( fsize < (1 << 15) )
        !           618:                    hsize = min ( 35023, HSIZE );
        !           619:                else if ( fsize < 47000 )
        !           620:                    hsize = min ( 50021, HSIZE );
        !           621: 
        !           622:                /* Generate output filename */
        !           623:                strcpy(ofname, *fileptr);
        !           624: #ifndef BSD4_2         /* Short filenames */
        !           625:                if ((cp=rindex(ofname,'/')) != NULL)    cp++;
        !           626:                else                                    cp = ofname;
        !           627:                if (strlen(cp) > 12) {
        !           628:                    fprintf(stderr,"%s: filename too long to tack on .Z\n",cp);
        !           629:                    continue;
        !           630:                }
        !           631: #endif  /* BSD4_2              Long filenames allowed */
        !           632:                strcat(ofname, ".Z");
        !           633:            }
        !           634:            /* Check for overwrite of existing file */
        !           635:            if (overwrite == 0 && zcat_flg == 0) {
        !           636:                if (stat(ofname, &statbuf) == 0) {
        !           637:                    char response[2];
        !           638:                    response[0] = 'n';
        !           639:                    fprintf(stderr, "%s already exists;", ofname);
        !           640:                    if (bgnd_flag == 0 && isatty(2)) {
        !           641:                        fprintf(stderr, " do you wish to overwrite %s (y or n)? ",
        !           642:                        ofname);
        !           643:                        fflush(stderr);
        !           644:                        read(2, response, 2);
        !           645:                        while (response[1] != '\n') {
        !           646:                            if (read(2, response+1, 1) < 0) {   /* Ack! */
        !           647:                                perror("stderr"); break;
        !           648:                            }
        !           649:                        }
        !           650:                    }
        !           651:                    if (response[0] != 'y') {
        !           652:                        fprintf(stderr, "\tnot overwritten\n");
        !           653:                        continue;
        !           654:                    }
        !           655:                }
        !           656:            }
        !           657:            if(zcat_flg == 0) {         /* Open output file */
        !           658:                if (freopen(ofname, "w", stdout) == NULL) {
        !           659:                    perror(ofname);
        !           660:                    perm_stat = 1;
        !           661:                    continue;
        !           662:                }
        !           663:                precious = 0;
        !           664:                if(!quiet)
        !           665:                        fprintf(stderr, "%s: ", *fileptr);
        !           666:            }
        !           667: 
        !           668:            /* Actually do the compression/decompression */
        !           669:            if (do_decomp == 0) compress();
        !           670: #ifndef DEBUG
        !           671:            else                        decompress();
        !           672: #else
        !           673:            else if (debug == 0)        decompress();
        !           674:            else                        printcodes();
        !           675:            if (verbose)                dump_tab();
        !           676: #endif /* DEBUG */
        !           677:            if(zcat_flg == 0) {
        !           678:                copystat(*fileptr, ofname);     /* Copy stats */
        !           679:                precious = 1;
        !           680:                if((exit_stat == 1) || (!quiet))
        !           681:                        putc('\n', stderr);
        !           682:            }
        !           683:        }
        !           684:     } else {           /* Standard input */
        !           685:        if (do_decomp == 0) {
        !           686:                compress();
        !           687: #ifdef DEBUG
        !           688:                if(verbose)             dump_tab();
        !           689: #endif /* DEBUG */
        !           690:                if(!quiet)
        !           691:                        putc('\n', stderr);
        !           692:        } else {
        !           693:            /* Check the magic number */
        !           694:            if (nomagic == 0) {
        !           695:                if ((getchar()!=(magic_header[0] & 0xFF))
        !           696:                 || (getchar()!=(magic_header[1] & 0xFF))) {
        !           697:                    fprintf(stderr, "stdin: not in compressed format\n");
        !           698:                    exit(1);
        !           699:                }
        !           700:                maxbits = getchar();    /* set -b from file */
        !           701:                block_compress = maxbits & BLOCK_MASK;
        !           702:                maxbits &= BIT_MASK;
        !           703:                maxmaxcode = 1 << maxbits;
        !           704:                fsize = 100000;         /* assume stdin large for USERMEM */
        !           705:                if(maxbits > BITS) {
        !           706:                        fprintf(stderr,
        !           707:                        "stdin: compressed with %d bits, can only handle %d bits\n",
        !           708:                        maxbits, BITS);
        !           709:                        exit(1);
        !           710:                }
        !           711:            }
        !           712: #ifndef DEBUG
        !           713:            decompress();
        !           714: #else
        !           715:            if (debug == 0)     decompress();
        !           716:            else                printcodes();
        !           717:            if (verbose)        dump_tab();
        !           718: #endif /* DEBUG */
        !           719:        }
        !           720:     }
        !           721:     exit(perm_stat ? perm_stat : exit_stat);
        !           722: }
        !           723: 
        !           724: static int offset;
        !           725: long int in_count = 1;                 /* length of input */
        !           726: long int bytes_out;                    /* length of compressed output */
        !           727: long int out_count = 0;                        /* # of codes output (for debugging) */
        !           728: 
        !           729: /*
        !           730:  * compress stdin to stdout
        !           731:  *
        !           732:  * Algorithm:  use open addressing double hashing (no chaining) on the 
        !           733:  * prefix code / next character combination.  We do a variant of Knuth's
        !           734:  * algorithm D (vol. 3, sec. 6.4) along with G. Knott's relatively-prime
        !           735:  * secondary probe.  Here, the modular division first probe is gives way
        !           736:  * to a faster exclusive-or manipulation.  Also do block compression with
        !           737:  * an adaptive reset, whereby the code table is cleared when the compression
        !           738:  * ratio decreases, but after the table fills.  The variable-length output
        !           739:  * codes are re-sized at this point, and a special CLEAR code is generated
        !           740:  * for the decompressor.  Late addition:  construct the table according to
        !           741:  * file size for noticeable speed improvement on small files.  Please direct
        !           742:  * questions about this implementation to ames!jaw.
        !           743:  */
        !           744: 
        !           745: compress() {
        !           746:     register long fcode;
        !           747:     register code_int i = 0;
        !           748:     register int c;
        !           749:     register code_int ent;
        !           750: #ifdef XENIX_16
        !           751:     register code_int disp;
        !           752: #else  /* Normal machine */
        !           753:     register int disp;
        !           754: #endif
        !           755:     register code_int hsize_reg;
        !           756:     register int hshift;
        !           757: 
        !           758: #ifndef COMPATIBLE
        !           759:     if (nomagic == 0) {
        !           760:        putchar(magic_header[0]); putchar(magic_header[1]);
        !           761:        putchar((char)(maxbits | block_compress));
        !           762:        if(ferror(stdout))
        !           763:                writeerr();
        !           764:     }
        !           765: #endif /* COMPATIBLE */
        !           766: 
        !           767:     offset = 0;
        !           768:     bytes_out = 3;             /* includes 3-byte header mojo */
        !           769:     out_count = 0;
        !           770:     clear_flg = 0;
        !           771:     ratio = 0;
        !           772:     in_count = 1;
        !           773:     checkpoint = CHECK_GAP;
        !           774:     maxcode = MAXCODE(n_bits = INIT_BITS);
        !           775:     free_ent = ((block_compress) ? FIRST : 256 );
        !           776: 
        !           777:     ent = getchar ();
        !           778: 
        !           779:     hshift = 0;
        !           780:     for ( fcode = (long) hsize;  fcode < 65536L; fcode *= 2L )
        !           781:        hshift++;
        !           782:     hshift = 8 - hshift;               /* set hash code range bound */
        !           783: 
        !           784:     hsize_reg = hsize;
        !           785:     cl_hash( (count_int) hsize_reg);           /* clear hash table */
        !           786: 
        !           787: #ifdef SIGNED_COMPARE_SLOW
        !           788:     while ( (c = getchar()) != (unsigned) EOF ) {
        !           789: #else
        !           790:     while ( (c = getchar()) != EOF ) {
        !           791: #endif
        !           792:        in_count++;
        !           793:        fcode = (long) (((long) c << maxbits) + ent);
        !           794:        i = ((c << hshift) ^ ent);      /* xor hashing */
        !           795: 
        !           796:        if ( htabof (i) == fcode ) {
        !           797:            ent = codetabof (i);
        !           798:            continue;
        !           799:        } else if ( (long)htabof (i) < 0 )      /* empty slot */
        !           800:            goto nomatch;
        !           801:        disp = hsize_reg - i;           /* secondary hash (after G. Knott) */
        !           802:        if ( i == 0 )
        !           803:            disp = 1;
        !           804: probe:
        !           805:        if ( (i -= disp) < 0 )
        !           806:            i += hsize_reg;
        !           807: 
        !           808:        if ( htabof (i) == fcode ) {
        !           809:            ent = codetabof (i);
        !           810:            continue;
        !           811:        }
        !           812:        if ( (long)htabof (i) > 0 ) 
        !           813:            goto probe;
        !           814: nomatch:
        !           815:        output ( (code_int) ent );
        !           816:        out_count++;
        !           817:        ent = c;
        !           818: #ifdef SIGNED_COMPARE_SLOW
        !           819:        if ( (unsigned) free_ent < (unsigned) maxmaxcode) {
        !           820: #else
        !           821:        if ( free_ent < maxmaxcode ) {
        !           822: #endif
        !           823:            codetabof (i) = free_ent++; /* code -> hashtable */
        !           824:            htabof (i) = fcode;
        !           825:        }
        !           826:        else if ( (count_int)in_count >= checkpoint && block_compress )
        !           827:            cl_block ();
        !           828:     }
        !           829:     /*
        !           830:      * Put out the final code.
        !           831:      */
        !           832:     output( (code_int)ent );
        !           833:     out_count++;
        !           834:     output( (code_int)-1 );
        !           835: 
        !           836:     /*
        !           837:      * Print out stats on stderr
        !           838:      */
        !           839:     if(zcat_flg == 0 && !quiet) {
        !           840: #ifdef DEBUG
        !           841:        fprintf( stderr,
        !           842:                "%ld chars in, %ld codes (%ld bytes) out, compression factor: ",
        !           843:                in_count, out_count, bytes_out );
        !           844:        prratio( stderr, in_count, bytes_out );
        !           845:        fprintf( stderr, "\n");
        !           846:        fprintf( stderr, "\tCompression as in compact: " );
        !           847:        prratio( stderr, in_count-bytes_out, in_count );
        !           848:        fprintf( stderr, "\n");
        !           849:        fprintf( stderr, "\tLargest code (of last block) was %d (%d bits)\n",
        !           850:                free_ent - 1, n_bits );
        !           851: #else /* !DEBUG */
        !           852:        fprintf( stderr, "Compression: " );
        !           853:        prratio( stderr, in_count-bytes_out, in_count );
        !           854: #endif /* DEBUG */
        !           855:     }
        !           856:     if(bytes_out > in_count)   /* exit(2) if no savings */
        !           857:        exit_stat = 2;
        !           858:     return;
        !           859: }
        !           860: 
        !           861: /*****************************************************************
        !           862:  * TAG( output )
        !           863:  *
        !           864:  * Output the given code.
        !           865:  * Inputs:
        !           866:  *     code:   A n_bits-bit integer.  If == -1, then EOF.  This assumes
        !           867:  *             that n_bits =< (long)wordsize - 1.
        !           868:  * Outputs:
        !           869:  *     Outputs code to the file.
        !           870:  * Assumptions:
        !           871:  *     Chars are 8 bits long.
        !           872:  * Algorithm:
        !           873:  *     Maintain a BITS character long buffer (so that 8 codes will
        !           874:  * fit in it exactly).  Use the VAX insv instruction to insert each
        !           875:  * code in turn.  When the buffer fills up empty it and start over.
        !           876:  */
        !           877: 
        !           878: static char buf[BITS];
        !           879: 
        !           880: #ifndef vax
        !           881: char_type lmask[9] = {0xff, 0xfe, 0xfc, 0xf8, 0xf0, 0xe0, 0xc0, 0x80, 0x00};
        !           882: char_type rmask[9] = {0x00, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f, 0xff};
        !           883: #endif /* vax */
        !           884: 
        !           885: output( code )
        !           886: code_int  code;
        !           887: {
        !           888: #ifdef DEBUG
        !           889:     static int col = 0;
        !           890: #endif /* DEBUG */
        !           891: 
        !           892:     /*
        !           893:      * On the VAX, it is important to have the register declarations
        !           894:      * in exactly the order given, or the asm will break.
        !           895:      */
        !           896:     register int r_off = offset, bits= n_bits;
        !           897:     register char * bp = buf;
        !           898: 
        !           899: #ifdef DEBUG
        !           900:        if ( verbose )
        !           901:            fprintf( stderr, "%5d%c", code,
        !           902:                    (col+=6) >= 74 ? (col = 0, '\n') : ' ' );
        !           903: #endif /* DEBUG */
        !           904:     if ( code >= 0 ) {
        !           905: #ifdef vax
        !           906:        /* VAX DEPENDENT!! Implementation on other machines is below.
        !           907:         *
        !           908:         * Translation: Insert BITS bits from the argument starting at
        !           909:         * offset bits from the beginning of buf.
        !           910:         */
        !           911:        0;      /* Work around for pcc -O bug with asm and if stmt */
        !           912:        asm( "insv      4(ap),r11,r10,(r9)" );
        !           913: #else /* not a vax */
        !           914: /* 
        !           915:  * byte/bit numbering on the VAX is simulated by the following code
        !           916:  */
        !           917:        /*
        !           918:         * Get to the first byte.
        !           919:         */
        !           920:        bp += (r_off >> 3);
        !           921:        r_off &= 7;
        !           922:        /*
        !           923:         * Since code is always >= 8 bits, only need to mask the first
        !           924:         * hunk on the left.
        !           925:         */
        !           926:        *bp = (*bp & rmask[r_off]) | (code << r_off) & lmask[r_off];
        !           927:        bp++;
        !           928:        bits -= (8 - r_off);
        !           929:        code >>= 8 - r_off;
        !           930:        /* Get any 8 bit parts in the middle (<=1 for up to 16 bits). */
        !           931:        if ( bits >= 8 ) {
        !           932:            *bp++ = code;
        !           933:            code >>= 8;
        !           934:            bits -= 8;
        !           935:        }
        !           936:        /* Last bits. */
        !           937:        if(bits)
        !           938:            *bp = code;
        !           939: #endif /* vax */
        !           940:        offset += n_bits;
        !           941:        if ( offset == (n_bits << 3) ) {
        !           942:            bp = buf;
        !           943:            bits = n_bits;
        !           944:            bytes_out += bits;
        !           945:            do
        !           946:                putchar(*bp++);
        !           947:            while(--bits);
        !           948:            offset = 0;
        !           949:        }
        !           950: 
        !           951:        /*
        !           952:         * If the next entry is going to be too big for the code size,
        !           953:         * then increase it, if possible.
        !           954:         */
        !           955:        if ( free_ent > maxcode || (clear_flg > 0))
        !           956:        {
        !           957:            /*
        !           958:             * Write the whole buffer, because the input side won't
        !           959:             * discover the size increase until after it has read it.
        !           960:             */
        !           961:            if ( offset > 0 ) {
        !           962:                if( fwrite( buf, 1, n_bits, stdout ) != n_bits)
        !           963:                        writeerr();
        !           964:                bytes_out += n_bits;
        !           965:            }
        !           966:            offset = 0;
        !           967: 
        !           968:            if ( clear_flg ) {
        !           969:                maxcode = MAXCODE (n_bits = INIT_BITS);
        !           970:                clear_flg = 0;
        !           971:            }
        !           972:            else {
        !           973:                n_bits++;
        !           974:                if ( n_bits == maxbits )
        !           975:                    maxcode = maxmaxcode;
        !           976:                else
        !           977:                    maxcode = MAXCODE(n_bits);
        !           978:            }
        !           979: #ifdef DEBUG
        !           980:            if ( debug ) {
        !           981:                fprintf( stderr, "\nChange to %d bits\n", n_bits );
        !           982:                col = 0;
        !           983:            }
        !           984: #endif /* DEBUG */
        !           985:        }
        !           986:     } else {
        !           987:        /*
        !           988:         * At EOF, write the rest of the buffer.
        !           989:         */
        !           990:        if ( offset > 0 )
        !           991:            fwrite( buf, 1, (offset + 7) / 8, stdout );
        !           992:        bytes_out += (offset + 7) / 8;
        !           993:        offset = 0;
        !           994:        fflush( stdout );
        !           995: #ifdef DEBUG
        !           996:        if ( verbose )
        !           997:            fprintf( stderr, "\n" );
        !           998: #endif /* DEBUG */
        !           999:        if( ferror( stdout ) )
        !          1000:                writeerr();
        !          1001:     }
        !          1002: }
        !          1003: 
        !          1004: /*
        !          1005:  * Decompress stdin to stdout.  This routine adapts to the codes in the
        !          1006:  * file building the "string" table on-the-fly; requiring no table to
        !          1007:  * be stored in the compressed file.  The tables used herein are shared
        !          1008:  * with those of the compress() routine.  See the definitions above.
        !          1009:  */
        !          1010: 
        !          1011: decompress() {
        !          1012:     register char_type *stackp;
        !          1013:     register int finchar;
        !          1014:     register code_int code, oldcode, incode;
        !          1015: 
        !          1016:     /*
        !          1017:      * As above, initialize the first 256 entries in the table.
        !          1018:      */
        !          1019:     maxcode = MAXCODE(n_bits = INIT_BITS);
        !          1020:     for ( code = 255; code >= 0; code-- ) {
        !          1021:        tab_prefixof(code) = 0;
        !          1022:        tab_suffixof(code) = (char_type)code;
        !          1023:     }
        !          1024:     free_ent = ((block_compress) ? FIRST : 256 );
        !          1025: 
        !          1026:     finchar = oldcode = getcode();
        !          1027:     if(oldcode == -1)  /* EOF already? */
        !          1028:        return;                 /* Get out of here */
        !          1029:     putchar( (char)finchar );          /* first code must be 8 bits = char */
        !          1030:     if(ferror(stdout))         /* Crash if can't write */
        !          1031:        writeerr();
        !          1032:     stackp = de_stack;
        !          1033: 
        !          1034:     while ( (code = getcode()) > -1 ) {
        !          1035: 
        !          1036:        if ( (code == CLEAR) && block_compress ) {
        !          1037:            for ( code = 255; code >= 0; code-- )
        !          1038:                tab_prefixof(code) = 0;
        !          1039:            clear_flg = 1;
        !          1040:            free_ent = FIRST - 1;
        !          1041:            if ( (code = getcode ()) == -1 )    /* O, untimely death! */
        !          1042:                break;
        !          1043:        }
        !          1044:        incode = code;
        !          1045:        /*
        !          1046:         * Special case for KwKwK string.
        !          1047:         */
        !          1048:        if ( code >= free_ent ) {
        !          1049:             *stackp++ = finchar;
        !          1050:            code = oldcode;
        !          1051:        }
        !          1052: 
        !          1053:        /*
        !          1054:         * Generate output characters in reverse order
        !          1055:         */
        !          1056: #ifdef SIGNED_COMPARE_SLOW
        !          1057:        while ( ((unsigned long)code) >= ((unsigned long)256) ) {
        !          1058: #else
        !          1059:        while ( code >= 256 ) {
        !          1060: #endif
        !          1061:            *stackp++ = tab_suffixof(code);
        !          1062:            code = tab_prefixof(code);
        !          1063:        }
        !          1064:        *stackp++ = finchar = tab_suffixof(code);
        !          1065: 
        !          1066:        /*
        !          1067:         * And put them out in forward order
        !          1068:         */
        !          1069:        do
        !          1070:            putchar ( *--stackp );
        !          1071:        while ( stackp > de_stack );
        !          1072: 
        !          1073:        /*
        !          1074:         * Generate the new entry.
        !          1075:         */
        !          1076:        if ( (code=free_ent) < maxmaxcode ) {
        !          1077:            tab_prefixof(code) = (unsigned short)oldcode;
        !          1078:            tab_suffixof(code) = finchar;
        !          1079:            free_ent = code+1;
        !          1080:        } 
        !          1081:        /*
        !          1082:         * Remember previous code.
        !          1083:         */
        !          1084:        oldcode = incode;
        !          1085:     }
        !          1086:     fflush( stdout );
        !          1087:     if(ferror(stdout))
        !          1088:        writeerr();
        !          1089: }
        !          1090: 
        !          1091: /*****************************************************************
        !          1092:  * TAG( getcode )
        !          1093:  *
        !          1094:  * Read one code from the standard input.  If EOF, return -1.
        !          1095:  * Inputs:
        !          1096:  *     stdin
        !          1097:  * Outputs:
        !          1098:  *     code or -1 is returned.
        !          1099:  */
        !          1100: 
        !          1101: code_int
        !          1102: getcode() {
        !          1103:     /*
        !          1104:      * On the VAX, it is important to have the register declarations
        !          1105:      * in exactly the order given, or the asm will break.
        !          1106:      */
        !          1107:     register code_int code;
        !          1108:     static int offset = 0, size = 0;
        !          1109:     static char_type buf[BITS];
        !          1110:     register int r_off, bits;
        !          1111:     register char_type *bp = buf;
        !          1112: 
        !          1113:     if ( clear_flg > 0 || offset >= size || free_ent > maxcode ) {
        !          1114:        /*
        !          1115:         * If the next entry will be too big for the current code
        !          1116:         * size, then we must increase the size.  This implies reading
        !          1117:         * a new buffer full, too.
        !          1118:         */
        !          1119:        if ( free_ent > maxcode ) {
        !          1120:            n_bits++;
        !          1121:            if ( n_bits == maxbits )
        !          1122:                maxcode = maxmaxcode;   /* won't get any bigger now */
        !          1123:            else
        !          1124:                maxcode = MAXCODE(n_bits);
        !          1125:        }
        !          1126:        if ( clear_flg > 0) {
        !          1127:            maxcode = MAXCODE (n_bits = INIT_BITS);
        !          1128:            clear_flg = 0;
        !          1129:        }
        !          1130:        size = fread( buf, 1, n_bits, stdin );
        !          1131:        if ( size <= 0 )
        !          1132:            return -1;                  /* end of file */
        !          1133:        offset = 0;
        !          1134:        /* Round size down to integral number of codes */
        !          1135:        size = (size << 3) - (n_bits - 1);
        !          1136:     }
        !          1137:     r_off = offset;
        !          1138:     bits = n_bits;
        !          1139: #ifdef vax
        !          1140:     asm( "extzv   r10,r9,(r8),r11" );
        !          1141: #else /* not a vax */
        !          1142:        /*
        !          1143:         * Get to the first byte.
        !          1144:         */
        !          1145:        bp += (r_off >> 3);
        !          1146:        r_off &= 7;
        !          1147:        /* Get first part (low order bits) */
        !          1148: #ifdef NO_UCHAR
        !          1149:        code = ((*bp++ >> r_off) & rmask[8 - r_off]) & 0xff;
        !          1150: #else
        !          1151:        code = (*bp++ >> r_off);
        !          1152: #endif /* NO_UCHAR */
        !          1153:        bits -= (8 - r_off);
        !          1154:        r_off = 8 - r_off;              /* now, offset into code word */
        !          1155:        /* Get any 8 bit parts in the middle (<=1 for up to 16 bits). */
        !          1156:        if ( bits >= 8 ) {
        !          1157: #ifdef NO_UCHAR
        !          1158:            code |= (*bp++ & 0xff) << r_off;
        !          1159: #else
        !          1160:            code |= *bp++ << r_off;
        !          1161: #endif /* NO_UCHAR */
        !          1162:            r_off += 8;
        !          1163:            bits -= 8;
        !          1164:        }
        !          1165:        /* high order bits. */
        !          1166:        code |= (*bp & rmask[bits]) << r_off;
        !          1167: #endif /* vax */
        !          1168:     offset += n_bits;
        !          1169: 
        !          1170:     return code;
        !          1171: }
        !          1172: 
        !          1173: char *
        !          1174: rindex(s, c)           /* For those who don't have it in libc.a */
        !          1175: register char *s, c;
        !          1176: {
        !          1177:        char *p;
        !          1178:        for (p = NULL; *s; s++)
        !          1179:            if (*s == c)
        !          1180:                p = s;
        !          1181:        return(p);
        !          1182: }
        !          1183: 
        !          1184: #ifdef DEBUG
        !          1185: printcodes()
        !          1186: {
        !          1187:     /*
        !          1188:      * Just print out codes from input file.  For debugging.
        !          1189:      */
        !          1190:     code_int code;
        !          1191:     int col = 0, bits;
        !          1192: 
        !          1193:     bits = n_bits = INIT_BITS;
        !          1194:     maxcode = MAXCODE(n_bits);
        !          1195:     free_ent = ((block_compress) ? FIRST : 256 );
        !          1196:     while ( ( code = getcode() ) >= 0 ) {
        !          1197:        if ( (code == CLEAR) && block_compress ) {
        !          1198:            free_ent = FIRST - 1;
        !          1199:            clear_flg = 1;
        !          1200:        }
        !          1201:        else if ( free_ent < maxmaxcode )
        !          1202:            free_ent++;
        !          1203:        if ( bits != n_bits ) {
        !          1204:            fprintf(stderr, "\nChange to %d bits\n", n_bits );
        !          1205:            bits = n_bits;
        !          1206:            col = 0;
        !          1207:        }
        !          1208:        fprintf(stderr, "%5d%c", code, (col+=6) >= 74 ? (col = 0, '\n') : ' ' );
        !          1209:     }
        !          1210:     putc( '\n', stderr );
        !          1211:     exit( 0 );
        !          1212: }
        !          1213: 
        !          1214: code_int sorttab[1<<BITS];     /* sorted pointers into htab */
        !          1215: 
        !          1216: dump_tab()     /* dump string table */
        !          1217: {
        !          1218:     register int i, first;
        !          1219:     register ent;
        !          1220: #define STACK_SIZE     15000
        !          1221:     int stack_top = STACK_SIZE;
        !          1222:     register c;
        !          1223: 
        !          1224:     if(do_decomp == 0) {       /* compressing */
        !          1225:        register int flag = 1;
        !          1226: 
        !          1227:        for(i=0; i<hsize; i++) {        /* build sort pointers */
        !          1228:                if((long)htabof(i) >= 0) {
        !          1229:                        sorttab[codetabof(i)] = i;
        !          1230:                }
        !          1231:        }
        !          1232:        first = block_compress ? FIRST : 256;
        !          1233:        for(i = first; i < free_ent; i++) {
        !          1234:                fprintf(stderr, "%5d: \"", i);
        !          1235:                de_stack[--stack_top] = '\n';
        !          1236:                de_stack[--stack_top] = '"';
        !          1237:                stack_top = in_stack((htabof(sorttab[i])>>maxbits)&0xff, 
        !          1238:                                      stack_top);
        !          1239:                for(ent=htabof(sorttab[i]) & ((1<<maxbits)-1);
        !          1240:                    ent > 256;
        !          1241:                    ent=htabof(sorttab[ent]) & ((1<<maxbits)-1)) {
        !          1242:                        stack_top = in_stack(htabof(sorttab[ent]) >> maxbits,
        !          1243:                                                stack_top);
        !          1244:                }
        !          1245:                stack_top = in_stack(ent, stack_top);
        !          1246:                fwrite( &de_stack[stack_top], 1, STACK_SIZE-stack_top, stderr);
        !          1247:                stack_top = STACK_SIZE;
        !          1248:        }
        !          1249:    } else if(!debug) { /* decompressing */
        !          1250: 
        !          1251:        for ( i = 0; i < free_ent; i++ ) {
        !          1252:           ent = i;
        !          1253:           c = tab_suffixof(ent);
        !          1254:           if ( isascii(c) && isprint(c) )
        !          1255:               fprintf( stderr, "%5d: %5d/'%c'  \"",
        !          1256:                           ent, tab_prefixof(ent), c );
        !          1257:           else
        !          1258:               fprintf( stderr, "%5d: %5d/\\%03o \"",
        !          1259:                           ent, tab_prefixof(ent), c );
        !          1260:           de_stack[--stack_top] = '\n';
        !          1261:           de_stack[--stack_top] = '"';
        !          1262:           for ( ; ent != NULL;
        !          1263:                   ent = (ent >= FIRST ? tab_prefixof(ent) : NULL) ) {
        !          1264:               stack_top = in_stack(tab_suffixof(ent), stack_top);
        !          1265:           }
        !          1266:           fwrite( &de_stack[stack_top], 1, STACK_SIZE - stack_top, stderr );
        !          1267:           stack_top = STACK_SIZE;
        !          1268:        }
        !          1269:     }
        !          1270: }
        !          1271: 
        !          1272: int
        !          1273: in_stack(c, stack_top)
        !          1274:        register c, stack_top;
        !          1275: {
        !          1276:        if ( (isascii(c) && isprint(c) && c != '\\') || c == ' ' ) {
        !          1277:            de_stack[--stack_top] = c;
        !          1278:        } else {
        !          1279:            switch( c ) {
        !          1280:            case '\n': de_stack[--stack_top] = 'n'; break;
        !          1281:            case '\t': de_stack[--stack_top] = 't'; break;
        !          1282:            case '\b': de_stack[--stack_top] = 'b'; break;
        !          1283:            case '\f': de_stack[--stack_top] = 'f'; break;
        !          1284:            case '\r': de_stack[--stack_top] = 'r'; break;
        !          1285:            case '\\': de_stack[--stack_top] = '\\'; break;
        !          1286:            default:
        !          1287:                de_stack[--stack_top] = '0' + c % 8;
        !          1288:                de_stack[--stack_top] = '0' + (c / 8) % 8;
        !          1289:                de_stack[--stack_top] = '0' + c / 64;
        !          1290:                break;
        !          1291:            }
        !          1292:            de_stack[--stack_top] = '\\';
        !          1293:        }
        !          1294:        return stack_top;
        !          1295: }
        !          1296: #endif /* DEBUG */
        !          1297: 
        !          1298: writeerr()
        !          1299: {
        !          1300:     perror ( ofname );
        !          1301:     unlink ( ofname );
        !          1302:     exit ( 1 );
        !          1303: }
        !          1304: 
        !          1305: copystat(ifname, ofname)
        !          1306: char *ifname, *ofname;
        !          1307: {
        !          1308:     struct stat statbuf;
        !          1309:     int mode;
        !          1310:     time_t timep[2];
        !          1311: 
        !          1312:     fclose(stdout);
        !          1313:     if (stat(ifname, &statbuf)) {              /* Get stat on input file */
        !          1314:        perror(ifname);
        !          1315:        return;
        !          1316:     }
        !          1317:     if ((statbuf.st_mode & S_IFMT/*0170000*/) != S_IFREG/*0100000*/) {
        !          1318:        if(quiet)
        !          1319:                fprintf(stderr, "%s: ", ifname);
        !          1320:        fprintf(stderr, " -- not a regular file: unchanged");
        !          1321:        exit_stat = 1;
        !          1322:        perm_stat = 1;
        !          1323:     } else if (statbuf.st_nlink > 1) {
        !          1324:        if(quiet)
        !          1325:                fprintf(stderr, "%s: ", ifname);
        !          1326:        fprintf(stderr, " -- has %d other links: unchanged",
        !          1327:                statbuf.st_nlink - 1);
        !          1328:        exit_stat = 1;
        !          1329:        perm_stat = 1;
        !          1330:     } else if (exit_stat == 2 && (!force)) { /* No compression: remove file.Z */
        !          1331:        if(!quiet)
        !          1332:                fprintf(stderr, " -- file unchanged");
        !          1333:     } else {                   /* ***** Successful Compression ***** */
        !          1334:        exit_stat = 0;
        !          1335:        mode = statbuf.st_mode & 07777;
        !          1336:        if (chmod(ofname, mode))                /* Copy modes */
        !          1337:            perror(ofname);
        !          1338:        chown(ofname, statbuf.st_uid, statbuf.st_gid);  /* Copy ownership */
        !          1339:        timep[0] = statbuf.st_atime;
        !          1340:        timep[1] = statbuf.st_mtime;
        !          1341:        utime(ofname, timep);   /* Update last accessed and modified times */
        !          1342:        if (unlink(ifname))     /* Remove input file */
        !          1343:            perror(ifname);
        !          1344:        if(!quiet)
        !          1345:                fprintf(stderr, " -- replaced with %s", ofname);
        !          1346:        return;         /* Successful return */
        !          1347:     }
        !          1348: 
        !          1349:     /* Unsuccessful return -- one of the tests failed */
        !          1350:     if (unlink(ofname))
        !          1351:        perror(ofname);
        !          1352: }
        !          1353: 
        !          1354: onintr ( )
        !          1355: {
        !          1356:     if (!precious)
        !          1357:        unlink ( ofname );
        !          1358:     exit ( 1 );
        !          1359: }
        !          1360: 
        !          1361: oops ( )       /* wild pointer -- assume bad input */
        !          1362: {
        !          1363:     if ( do_decomp ) 
        !          1364:        fprintf ( stderr, "uncompress: corrupt input\n" );
        !          1365:     unlink ( ofname );
        !          1366:     exit ( 1 );
        !          1367: }
        !          1368: 
        !          1369: cl_block ()            /* table clear for block compress */
        !          1370: {
        !          1371:     register long int rat;
        !          1372: 
        !          1373:     checkpoint = in_count + CHECK_GAP;
        !          1374: #ifdef DEBUG
        !          1375:        if ( debug ) {
        !          1376:                fprintf ( stderr, "count: %ld, ratio: ", in_count );
        !          1377:                prratio ( stderr, in_count, bytes_out );
        !          1378:                fprintf ( stderr, "\n");
        !          1379:        }
        !          1380: #endif /* DEBUG */
        !          1381: 
        !          1382:     if(in_count > 0x007fffff) {        /* shift will overflow */
        !          1383:        rat = bytes_out >> 8;
        !          1384:        if(rat == 0) {          /* Don't divide by zero */
        !          1385:            rat = 0x7fffffff;
        !          1386:        } else {
        !          1387:            rat = in_count / rat;
        !          1388:        }
        !          1389:     } else {
        !          1390:        rat = (in_count << 8) / bytes_out;      /* 8 fractional bits */
        !          1391:     }
        !          1392:     if ( rat > ratio ) {
        !          1393:        ratio = rat;
        !          1394:     } else {
        !          1395:        ratio = 0;
        !          1396: #ifdef DEBUG
        !          1397:        if(verbose)
        !          1398:                dump_tab();     /* dump string table */
        !          1399: #endif
        !          1400:        cl_hash ( (count_int) hsize );
        !          1401:        free_ent = FIRST;
        !          1402:        clear_flg = 1;
        !          1403:        output ( (code_int) CLEAR );
        !          1404: #ifdef DEBUG
        !          1405:        if(debug)
        !          1406:                fprintf ( stderr, "clear\n" );
        !          1407: #endif /* DEBUG */
        !          1408:     }
        !          1409: }
        !          1410: 
        !          1411: cl_hash(hsize)         /* reset code table */
        !          1412:        register count_int hsize;
        !          1413: {
        !          1414: #ifndef XENIX_16       /* Normal machine */
        !          1415:        register count_int *htab_p = htab+hsize;
        !          1416: #else
        !          1417:        register j;
        !          1418:        register long k = hsize;
        !          1419:        register count_int *htab_p;
        !          1420: #endif
        !          1421:        register long i;
        !          1422:        register long m1 = -1;
        !          1423: 
        !          1424: #ifdef XENIX_16
        !          1425:     for(j=0; j<=8 && k>=0; j++,k-=8192) {
        !          1426:        i = 8192;
        !          1427:        if(k < 8192) {
        !          1428:                i = k;
        !          1429:        }
        !          1430:        htab_p = &(htab[j][i]);
        !          1431:        i -= 16;
        !          1432:        if(i > 0) {
        !          1433: #else
        !          1434:        i = hsize - 16;
        !          1435: #endif
        !          1436:        do {                            /* might use Sys V memset(3) here */
        !          1437:                *(htab_p-16) = m1;
        !          1438:                *(htab_p-15) = m1;
        !          1439:                *(htab_p-14) = m1;
        !          1440:                *(htab_p-13) = m1;
        !          1441:                *(htab_p-12) = m1;
        !          1442:                *(htab_p-11) = m1;
        !          1443:                *(htab_p-10) = m1;
        !          1444:                *(htab_p-9) = m1;
        !          1445:                *(htab_p-8) = m1;
        !          1446:                *(htab_p-7) = m1;
        !          1447:                *(htab_p-6) = m1;
        !          1448:                *(htab_p-5) = m1;
        !          1449:                *(htab_p-4) = m1;
        !          1450:                *(htab_p-3) = m1;
        !          1451:                *(htab_p-2) = m1;
        !          1452:                *(htab_p-1) = m1;
        !          1453:                htab_p -= 16;
        !          1454:        } while ((i -= 16) >= 0);
        !          1455: #ifdef XENIX_16
        !          1456:        }
        !          1457:     }
        !          1458: #endif
        !          1459:        for ( i += 16; i > 0; i-- )
        !          1460:                *--htab_p = m1;
        !          1461: }
        !          1462: 
        !          1463: prratio(stream, num, den)
        !          1464: FILE *stream;
        !          1465: long int num, den;
        !          1466: {
        !          1467:        register int q;                 /* Doesn't need to be long */
        !          1468: 
        !          1469:        if(num > 214748L) {             /* 2147483647/10000 */
        !          1470:                q = num / (den / 10000L);
        !          1471:        } else {
        !          1472:                q = 10000L * num / den;         /* Long calculations, though */
        !          1473:        }
        !          1474:        if (q < 0) {
        !          1475:                putc('-', stream);
        !          1476:                q = -q;
        !          1477:        }
        !          1478:        fprintf(stream, "%d.%02d%%", q / 100, q % 100);
        !          1479: }
        !          1480: 
        !          1481: version()
        !          1482: {
        !          1483:        fprintf(stderr, "%s, Berkeley 5.9 5/11/86\n", rcs_ident);
        !          1484:        fprintf(stderr, "Options: ");
        !          1485: #ifdef vax
        !          1486:        fprintf(stderr, "vax, ");
        !          1487: #endif
        !          1488: #ifdef NO_UCHAR
        !          1489:        fprintf(stderr, "NO_UCHAR, ");
        !          1490: #endif
        !          1491: #ifdef SIGNED_COMPARE_SLOW
        !          1492:        fprintf(stderr, "SIGNED_COMPARE_SLOW, ");
        !          1493: #endif
        !          1494: #ifdef XENIX_16
        !          1495:        fprintf(stderr, "XENIX_16, ");
        !          1496: #endif
        !          1497: #ifdef COMPATIBLE
        !          1498:        fprintf(stderr, "COMPATIBLE, ");
        !          1499: #endif
        !          1500: #ifdef DEBUG
        !          1501:        fprintf(stderr, "DEBUG, ");
        !          1502: #endif
        !          1503: #ifdef BSD4_2
        !          1504:        fprintf(stderr, "BSD4_2, ");
        !          1505: #endif
        !          1506:        fprintf(stderr, "BITS = %d\n", BITS);
        !          1507: }

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