source: trunk/minix/commands/simple/compress.c@ 15

Last change on this file since 15 was 9, checked in by Mattia Monga, 14 years ago

Minix 3.1.2a
File size: 38.2 KB
RevLine 
[9]1/* compress - Reduce file size using Modified Lempel-Ziv encoding */
2
3/*
4 * compress.c - File compression ala IEEE Computer, June 1984.
5 *
6 * Authors: Spencer W. Thomas (decvax!harpo!utah-cs!utah-gr!thomas)
7 * Jim McKie (decvax!mcvax!jim)
8 * Steve Davies (decvax!vax135!petsd!peora!srd)
9 * Ken Turkowski (decvax!decwrl!turtlevax!ken)
10 * James A. Woods (decvax!ihnp4!ames!jaw)
11 * Joe Orost (decvax!vax135!petsd!joe)
12 *
13 * Richard Todd Port to MINIX
14 * Andy Tanenbaum Cleanup
15 *
16 *
17 * Algorithm from "A Technique for High Performance Data Compression",
18 * Terry A. Welch, IEEE Computer Vol 17, No 6 (June 1984), pp 8-19.
19 *
20 * Usage: compress [-dfvc] [-b bits] [file ...]
21 * Inputs:
22 * -d: If given, decompression is done instead.
23 *
24 * -c: Write output on stdout.
25 *
26 * -b: Parameter limits the max number of bits/code.
27 *
28 * -f: Forces output file to be generated, even if one already
29 * exists, and even if no space is saved by compressing.
30 * If -f is not used, the user will be prompted if stdin is
31 * a tty, otherwise, the output file will not be overwritten.
32 *
33 * -v: Write compression statistics
34 *
35 * file ...: Files to be compressed. If none specified, stdin
36 * is used.
37 * Outputs:
38 * file.Z: Compressed form of file with same mode, owner, and utimes
39 * or stdout (if stdin used as input)
40 *
41 * Assumptions:
42 * When filenames are given, replaces with the compressed version
43 * (.Z suffix) only if the file decreases in size.
44 * Algorithm:
45 * Modified Lempel-Ziv method (LZW). Basically finds common
46 * substrings and replaces them with a variable size code. This is
47 * deterministic, and can be done on the fly. Thus, the decompression
48 * procedure needs no input table, but tracks the way the table was built.
49 */
50
51
52#define AZTEC86 1
53
54#define min(a,b) ((a>b) ? b : a)
55
56/*
57 * Set USERMEM to the maximum amount of physical user memory available
58 * in bytes. USERMEM is used to determine the maximum BITS that can be used
59 * for compression.
60 *
61 * SACREDMEM is the amount of physical memory saved for others; compress
62 * will hog the rest.
63 */
64#ifndef SACREDMEM
65#define SACREDMEM 0
66#endif
67
68#ifndef USERMEM
69# define USERMEM 450000 /* default user memory */
70#endif
71
72#define REGISTER register
73#define DOTZ ".Z"
74
75#include <limits.h>
76#include <dirent.h>
77
78/* The default for Minix is -b13, but we can do -b16 if the machine can. */
79#define DEFAULTBITS 13
80#if INT_MAX == 32767
81# define BITS 13
82#else
83# define BITS 16
84#endif
85
86#ifdef USERMEM
87# if USERMEM >= (433484+SACREDMEM)
88# define PBITS 16
89# else
90# if USERMEM >= (229600+SACREDMEM)
91# define PBITS 15
92# else
93# if USERMEM >= (127536+SACREDMEM)
94# define PBITS 14
95# else
96# if USERMEM >= (73464+SACREDMEM)
97# define PBITS 13
98# else
99# define PBITS 12
100# endif
101# endif
102# endif
103# endif
104# undef USERMEM
105#endif /* USERMEM */
106
107#ifdef PBITS /* Preferred BITS for this memory size */
108# ifndef BITS
109# define BITS PBITS
110# endif
111#endif /* PBITS */
112
113#if BITS == 16
114# define HSIZE 69001 /* 95% occupancy */
115#endif
116#if BITS == 15
117# define HSIZE 35023 /* 94% occupancy */
118#endif
119#if BITS == 14
120# define HSIZE 18013 /* 91% occupancy */
121#endif
122#if BITS == 13
123# define HSIZE 9001 /* 91% occupancy */
124#endif
125#if BITS <= 12
126# define HSIZE 5003 /* 80% occupancy */
127#endif
128
129
130/*
131 * a code_int must be able to hold 2**BITS values of type int, and also -1
132 */
133#if BITS > 15
134typedef long int code_int;
135#else
136typedef int code_int;
137#endif
138
139#ifdef SIGNED_COMPARE_SLOW
140typedef unsigned long int count_int;
141typedef unsigned short int count_short;
142#else
143typedef long int count_int;
144#endif
145
146#ifdef NO_UCHAR
147 typedef char char_type;
148#else
149 typedef unsigned char char_type;
150#endif /* UCHAR */
151char_type magic_header[] = "\037\235"; /* 1F 9D */
152
153/* Defines for third byte of header */
154#define BIT_MASK 0x1f
155#define BLOCK_MASK 0x80
156/* Masks 0x40 and 0x20 are free. I think 0x20 should mean that there is
157 a fourth header byte (for expansion).
158*/
159#define INIT_BITS 9 /* initial number of bits/code */
160
161#include <sys/types.h>
162#include <sys/stat.h>
163#include <fcntl.h>
164#include <ctype.h>
165#include <signal.h>
166#include <stdlib.h>
167#include <string.h>
168#include <unistd.h>
169#include <utime.h>
170#include <stdio.h>
171
172#define ARGVAL() (*++(*argv) || (--argc && *++argv))
173
174int n_bits; /* number of bits/code */
175int maxbits = DEFAULTBITS; /* user settable max # bits/code */
176code_int maxcode; /* maximum code, given n_bits */
177code_int maxmaxcode = 1 << BITS; /* should NEVER generate this code */
178#ifdef COMPATIBLE /* But wrong! */
179# define MAXCODE(n_bits) (1 << (n_bits) - 1)
180#else
181# define MAXCODE(n_bits) ((1 << (n_bits)) - 1)
182#endif /* COMPATIBLE */
183
184#ifndef AZTEC86
185 count_int htab [HSIZE];
186 unsigned short codetab [HSIZE];
187#else
188 count_int *htab;
189 unsigned short *codetab;
190# define HTABSIZE ((size_t)(HSIZE*sizeof(count_int)))
191# define CODETABSIZE ((size_t)(HSIZE*sizeof(unsigned short)))
192
193
194#define htabof(i) htab[i]
195#define codetabof(i) codetab[i]
196#endif /* XENIX_16 */
197code_int hsize = HSIZE; /* for dynamic table sizing */
198count_int fsize;
199
200/*
201 * To save much memory, we overlay the table used by compress() with those
202 * used by decompress(). The tab_prefix table is the same size and type
203 * as the codetab. The tab_suffix table needs 2**BITS characters. We
204 * get this from the beginning of htab. The output stack uses the rest
205 * of htab, and contains characters. There is plenty of room for any
206 * possible stack (stack used to be 8000 characters).
207 */
208
209#define tab_prefixof(i) codetabof(i)
210#ifdef XENIX_16
211# define tab_suffixof(i) ((char_type *)htab[(i)>>15])[(i) & 0x7fff]
212# define de_stack ((char_type *)(htab2))
213#else /* Normal machine */
214# define tab_suffixof(i) ((char_type *)(htab))[i]
215# define de_stack ((char_type *)&tab_suffixof(1<<BITS))
216#endif /* XENIX_16 */
217
218code_int free_ent = 0; /* first unused entry */
219int exit_stat = 0;
220
221_PROTOTYPE(int main, (int argc, char **argv));
222_PROTOTYPE(void Usage, (void));
223_PROTOTYPE(void compress, (void));
224_PROTOTYPE(void onintr, (int dummy));
225_PROTOTYPE(void oops, (int dummy));
226_PROTOTYPE(void output, (code_int code));
227_PROTOTYPE(int foreground, (void));
228_PROTOTYPE(void decompress, (void));
229_PROTOTYPE(code_int getcode, (void));
230_PROTOTYPE(void writeerr, (void));
231_PROTOTYPE(void copystat, (char *ifname, char *ofname));
232_PROTOTYPE(int foreground, (void));
233_PROTOTYPE(void cl_block , (void));
234_PROTOTYPE(void cl_hash, (count_int hsize));
235_PROTOTYPE(void prratio, (FILE *stream, long int num, long int den));
236_PROTOTYPE(void version, (void));
237
238void Usage() {
239#ifdef DEBUG
240fprintf(stderr,"Usage: compress [-dDVfc] [-b maxbits] [file ...]\n");
241}
242int debug = 0;
243#else
244fprintf(stderr,"Usage: compress [-dfvcV] [-b maxbits] [file ...]\n");
245}
246#endif /* DEBUG */
247int nomagic = 0; /* Use a 3-byte magic number header, unless old file */
248int zcat_flg = 0; /* Write output on stdout, suppress messages */
249int quiet = 0; /* don't tell me about compression */
250
251/*
252 * block compression parameters -- after all codes are used up,
253 * and compression rate changes, start over.
254 */
255int block_compress = BLOCK_MASK;
256int clear_flg = 0;
257long int ratio = 0;
258#define CHECK_GAP 10000 /* ratio check interval */
259count_int checkpoint = CHECK_GAP;
260/*
261 * the next two codes should not be changed lightly, as they must not
262 * lie within the contiguous general code space.
263 */
264#define FIRST 257 /* first free entry */
265#define CLEAR 256 /* table clear output code */
266
267int force = 0;
268char ofname [100];
269#ifdef DEBUG
270int verbose = 0;
271#endif /* DEBUG */
272
273#ifndef METAWARE
274#ifdef AZTEC86
275void
276#else
277int
278#endif
279#ifndef __STDC__
280(*bgnd_flag)();
281#else
282(*bgnd_flag)(int);
283#endif
284#endif
285
286int do_decomp = 0;
287
288
289int main(argc, argv)
290int argc;
291char **argv;
292{
293 int overwrite = 0; /* Do not overwrite unless given -f flag */
294 char tempname[100];
295 char **filelist, **fileptr;
296 char *cp;
297 struct stat statbuf;
298#ifndef METAWARE
299 if ( (bgnd_flag = signal ( SIGINT, SIG_IGN )) != SIG_IGN ) {
300 signal ( SIGINT, onintr );
301 signal ( SIGSEGV, oops );
302 }
303#endif
304#ifdef AZTEC86
305#ifdef METAWARE
306 _setmode(NULL,_ALL_FILES_BINARY);
307 _setmode(stdin,_BINARY);
308 _setmode(stdout,_BINARY);
309 _setmode(stderr,_TEXT);
310#endif
311 if (NULL == (htab = (count_int *)malloc(HTABSIZE)))
312 {
313 fprintf(stderr,"Can't allocate htab\n");
314 exit(1);
315 }
316 if (NULL == (codetab = (unsigned short *)malloc(CODETABSIZE)))
317 {
318 fprintf(stderr,"Can't allocate codetab\n");
319 exit(1);
320 }
321#endif
322#ifdef COMPATIBLE
323 nomagic = 1; /* Original didn't have a magic number */
324#endif /* COMPATIBLE */
325
326 filelist = fileptr = (char **)(malloc((size_t)(argc * sizeof(*argv))));
327 *filelist = NULL;
328
329 if((cp = strrchr(argv[0], '/')) != 0) {
330 cp++;
331 } else {
332 cp = argv[0];
333 }
334 if(strcmp(cp, "uncompress") == 0) {
335 do_decomp = 1;
336 } else if(strcmp(cp, "zcat") == 0) {
337 do_decomp = 1;
338 zcat_flg = 1;
339 }
340
341#ifdef BSD4_2
342 /* 4.2BSD dependent - take it out if not */
343 setlinebuf( stderr );
344#endif /* BSD4_2 */
345
346 /* Argument Processing
347 * All flags are optional.
348 * -D => debug
349 * -V => print Version; debug verbose
350 * -d => do_decomp
351 * -v => unquiet
352 * -f => force overwrite of output file
353 * -n => no header: useful to uncompress old files
354 * -b maxbits => maxbits. If -b is specified, then maxbits MUST be
355 * given also.
356 * -c => cat all output to stdout
357 * -C => generate output compatible with compress 2.0.
358 * if a string is left, must be an input filename.
359 */
360 for (argc--, argv++; argc > 0; argc--, argv++)
361 {
362 if (**argv == '-')
363 { /* A flag argument */
364 while (*++(*argv))
365 { /* Process all flags in this arg */
366 switch (**argv)
367 {
368#ifdef DEBUG
369 case 'D':
370 debug = 1;
371 break;
372 case 'V':
373 verbose = 1;
374 version();
375 break;
376#else
377 case 'V':
378 version();
379 break;
380#endif /* DEBUG */
381 case 'v':
382 quiet = 0;
383 break;
384 case 'd':
385 do_decomp = 1;
386 break;
387 case 'f':
388 case 'F':
389 overwrite = 1;
390 force = 1;
391 break;
392 case 'n':
393 nomagic = 1;
394 break;
395 case 'C':
396 block_compress = 0;
397 break;
398 case 'b':
399 if (!ARGVAL())
400 {
401 fprintf(stderr, "Missing maxbits\n");
402 Usage();
403 exit(1);
404 }
405 maxbits = atoi(*argv);
406 goto nextarg;
407 case 'c':
408 zcat_flg = 1;
409 break;
410 case 'q':
411 quiet = 1;
412 break;
413 default:
414 fprintf(stderr, "Unknown flag: '%c'; ", **argv);
415 Usage();
416 exit(1);
417 }
418 }
419 }
420 else
421 { /* Input file name */
422 *fileptr++ = *argv; /* Build input file list */
423 *fileptr = NULL;
424 /* process nextarg; */
425 }
426 nextarg: continue;
427 }
428
429 if(maxbits < INIT_BITS) maxbits = INIT_BITS;
430 if (maxbits > BITS) maxbits = BITS;
431 maxmaxcode = 1 << maxbits;
432
433 if (*filelist != NULL)
434 {
435 for (fileptr = filelist; *fileptr; fileptr++)
436 {
437 exit_stat = 0;
438 if (do_decomp != 0)
439 { /* DECOMPRESSION */
440 /* Check for .Z suffix */
441#ifndef PCDOS
442 if (strcmp(*fileptr + strlen(*fileptr) - 2, DOTZ) != 0)
443#else
444 if (strcmp(*fileptr + strlen(*fileptr) - 1, DOTZ) != 0)
445#endif
446 {
447 /* No .Z: tack one on */
448 strcpy(tempname, *fileptr);
449#ifndef PCDOS
450 strcat(tempname, DOTZ);
451#else
452 /* either tack one on or replace last character */
453 {
454 char *dot;
455 if (NULL == (dot = strchr(tempname,'.')))
456 {
457 strcat(tempname,".Z");
458 }
459 else
460 /* if there is a dot then either tack a z on
461 or replace last character */
462 {
463 if (strlen(dot) < 4)
464 strcat(tempname,DOTZ);
465 else
466 dot[3] = 'Z';
467 }
468 }
469#endif
470 *fileptr = tempname;
471 }
472 /* Open input file */
473 if ((freopen(*fileptr, "r", stdin)) == NULL)
474 {
475 perror(*fileptr); continue;
476 }
477 /* Check the magic number */
478 if (nomagic == 0)
479 {
480 unsigned magic1, magic2;
481 if (((magic1 = getc(stdin)) != (magic_header[0] & 0xFF))
482 || ((magic2 = getc(stdin)) != (magic_header[1] & 0xFF)))
483 {
484 fprintf(stderr,
485 "%s: not in compressed format %x %x\n",
486 *fileptr,magic1,magic2);
487 continue;
488 }
489 maxbits = getc(stdin); /* set -b from file */
490 block_compress = maxbits & BLOCK_MASK;
491 maxbits &= BIT_MASK;
492 maxmaxcode = 1 << maxbits;
493 if(maxbits > BITS)
494 {
495 fprintf(stderr,
496 "%s: compressed with %d bits, can only handle %d bits\n",
497 *fileptr, maxbits, BITS);
498 continue;
499 }
500 }
501 /* Generate output filename */
502 strcpy(ofname, *fileptr);
503#ifndef PCDOS
504 ofname[strlen(*fileptr) - 2] = '\0'; /* Strip off .Z */
505#else
506 /* kludge to handle various common three character extension */
507 {
508 char *dot;
509 char fixup = '\0';
510 /* first off, map name to upper case */
511 for (dot = ofname; *dot; dot++)
512 *dot = toupper(*dot);
513 if (NULL == (dot = strchr(ofname,'.')))
514 {
515 fprintf(stderr,"Bad filename %s\n",ofname);
516 exit(1);
517 }
518 if (strlen(dot) == 4)
519 /* we got three letter extensions */
520 {
521 if (strcmp(dot,".EXZ") == 0)
522 fixup = 'E';
523 else if (strcmp(dot,".COZ") == 0)
524 fixup = 'M';
525 else if (strcmp(dot,".BAZ") == 0)
526 fixup = 'S';
527 else if (strcmp(dot,".OBZ") == 0)
528 fixup = 'J';
529 else if (strcmp(dot,".SYZ") == 0)
530 fixup = 'S';
531 else if (strcmp(dot,".DOZ") == 0)
532 fixup = 'C';
533
534 }
535 /* replace the Z */
536 ofname[strlen(*fileptr) - 1] = fixup;
537 }
538#endif
539 } else
540 { /* COMPRESSION */
541 if (strcmp(*fileptr + strlen(*fileptr) - 2, DOTZ) == 0)
542 {
543 fprintf(stderr, "%s: already has .Z suffix -- no change\n",
544 *fileptr);
545 continue;
546 }
547 /* Open input file */
548 if ((freopen(*fileptr, "r", stdin)) == NULL)
549 {
550 perror(*fileptr); continue;
551 }
552 (void)stat( *fileptr, &statbuf );
553 fsize = (long) statbuf.st_size;
554 /*
555 * tune hash table size for small files -- ad hoc,
556 * but the sizes match earlier #defines, which
557 * serve as upper bounds on the number of output codes.
558 */
559 hsize = HSIZE; /*lint -e506 -e712 */
560 if ( fsize < (1 << 12) )
561 hsize = min ( 5003, HSIZE );
562 else if ( fsize < (1 << 13) )
563 hsize = min ( 9001, HSIZE );
564 else if ( fsize < (1 << 14) )
565 hsize = min ( 18013, HSIZE );
566 else if ( fsize < (1 << 15) )
567 hsize = min ( 35023, HSIZE );
568 else if ( fsize < 47000 )
569 hsize = min ( 50021, HSIZE ); /*lint +e506 +e712 */
570
571 /* Generate output filename */
572 strcpy(ofname, *fileptr);
573#ifndef BSD4_2 /* Short filenames */
574 if ((cp=strrchr(ofname,'/')) != NULL)
575 cp++;
576 else
577 cp = ofname;
578 if (strlen(cp) >= _DIRENT_NAME_LEN-3)
579 {
580 fprintf(stderr,"%s: filename too long to tack on .Z\n",cp);
581 continue;
582 }
583#ifdef PCDOS
584 else
585 {
586 /* either tack one on or replace last character */
587 char *dot;
588 if (NULL == (dot = strchr(cp,'.')))
589 {
590 strcat(cp,".Z");
591 }
592 else
593 /* if there is a dot then either tack a z on
594 or replace last character */
595 {
596 if (strlen(dot) < 4)
597 strcat(cp,DOTZ);
598 else
599 dot[3] = 'Z';
600 }
601 }
602#endif
603#endif /* BSD4_2 Long filenames allowed */
604#ifndef PCDOS
605 /* PCDOS takes care of this above */
606 strcat(ofname, DOTZ);
607#endif
608 }
609 /* Check for overwrite of existing file */
610 if (overwrite == 0 && zcat_flg == 0)
611 {
612 if (stat(ofname, &statbuf) == 0)
613 {
614 char response[2]; int fd;
615 response[0] = 'n';
616 fprintf(stderr, "%s already exists;", ofname);
617 if (foreground())
618 {
619 fd = open("/dev/tty", O_RDONLY);
620 fprintf(stderr,
621 " do you wish to overwrite %s (y or n)? ", ofname);
622 fflush(stderr);
623 (void)read(fd, response, 2);
624 while (response[1] != '\n')
625 {
626 if (read(fd, response+1, 1) < 0)
627 { /* Ack! */
628 perror("stderr");
629 break;
630 }
631 }
632 close(fd);
633 }
634 if (response[0] != 'y')
635 {
636 fprintf(stderr, "\tnot overwritten\n");
637 continue;
638 }
639 }
640 }
641 if(zcat_flg == 0)
642 { /* Open output file */
643 if (freopen(ofname, "w", stdout) == NULL)
644 {
645 perror(ofname);
646 continue;
647 }
648 if(!quiet)
649 fprintf(stderr, "%s: ", *fileptr);
650 }
651
652 /* Actually do the compression/decompression */
653 if (do_decomp == 0)
654 compress();
655#ifndef DEBUG
656 else
657 decompress();
658#else
659 else if (debug == 0)
660 decompress();
661 else
662 printcodes();
663 if (verbose)
664 dump_tab();
665#endif /* DEBUG */
666 if(zcat_flg == 0)
667 {
668 copystat(*fileptr, ofname); /* Copy stats */
669 if((exit_stat == 1) || (!quiet))
670 putc('\n', stderr);
671 }
672 }
673 } else
674 { /* Standard input */
675 if (do_decomp == 0)
676 {
677 compress();
678#ifdef DEBUG
679 if(verbose) dump_tab();
680#endif /* DEBUG */
681 if(!quiet)
682 putc('\n', stderr);
683 } else
684 {
685 /* Check the magic number */
686 if (nomagic == 0)
687 {
688 if ((getc(stdin)!=(magic_header[0] & 0xFF))
689 || (getc(stdin)!=(magic_header[1] & 0xFF)))
690 {
691 fprintf(stderr, "stdin: not in compressed format\n");
692 exit(1);
693 }
694 maxbits = getc(stdin); /* set -b from file */
695 block_compress = maxbits & BLOCK_MASK;
696 maxbits &= BIT_MASK;
697 maxmaxcode = 1 << maxbits;
698 fsize = 100000; /* assume stdin large for USERMEM */
699 if(maxbits > BITS)
700 {
701 fprintf(stderr,
702 "stdin: compressed with %d bits, can only handle %d bits\n",
703 maxbits, BITS);
704 exit(1);
705 }
706 }
707#ifndef DEBUG
708 decompress();
709#else
710 if (debug == 0) decompress();
711 else printcodes();
712 if (verbose) dump_tab();
713#endif /* DEBUG */
714 }
715 }
716 return(exit_stat);
717}
718
719static int offset;
720long int in_count = 1; /* length of input */
721long int bytes_out; /* length of compressed output */
722long int out_count = 0; /* # of codes output (for debugging) */
723
724/*
725 * compress stdin to stdout
726 *
727 * Algorithm: use open addressing double hashing (no chaining) on the
728 * prefix code / next character combination. We do a variant of Knuth's
729 * algorithm D (vol. 3, sec. 6.4) along with G. Knott's relatively-prime
730 * secondary probe. Here, the modular division first probe is gives way
731 * to a faster exclusive-or manipulation. Also do block compression with
732 * an adaptive reset, whereby the code table is cleared when the compression
733 * ratio decreases, but after the table fills. The variable-length output
734 * codes are re-sized at this point, and a special CLEAR code is generated
735 * for the decompressor. Late addition: construct the table according to
736 * file size for noticeable speed improvement on small files. Please direct
737 * questions about this implementation to ames!jaw.
738 */
739
740void compress()
741{
742 REGISTER long fcode;
743 REGISTER code_int i = 0;
744 REGISTER int c;
745 REGISTER code_int ent;
746#ifdef XENIX_16
747 REGISTER code_int disp;
748#else /* Normal machine */
749 REGISTER int disp;
750#endif
751 REGISTER code_int hsize_reg;
752 REGISTER int hshift;
753
754#ifndef COMPATIBLE
755 if (nomagic == 0)
756 {
757 putc(magic_header[0],stdout);
758 putc(magic_header[1],stdout);
759 putc((char)(maxbits | block_compress),stdout);
760 if(ferror(stdout))
761 writeerr();
762 }
763#endif /* COMPATIBLE */
764
765 offset = 0;
766 bytes_out = 3; /* includes 3-byte header mojo */
767 out_count = 0;
768 clear_flg = 0;
769 ratio = 0;
770 in_count = 1;
771 checkpoint = CHECK_GAP;
772 maxcode = MAXCODE(n_bits = INIT_BITS);
773 free_ent = ((block_compress) ? FIRST : 256 );
774
775 ent = getc(stdin);
776
777 hshift = 0;
778 for ( fcode = (long) hsize; fcode < 65536L; fcode *= 2L )
779 hshift++;
780 hshift = 8 - hshift; /* set hash code range bound */
781
782 hsize_reg = hsize;
783 cl_hash( (count_int) hsize_reg); /* clear hash table */
784
785#ifdef SIGNED_COMPARE_SLOW
786 while ( (c = getc(stdin)) != (unsigned) EOF )
787#else
788 while ( (c = getc(stdin)) != EOF )
789#endif
790 {
791 in_count++;
792 fcode = (long) (((long) c << maxbits) + ent);
793 i = ((c << hshift) ^ ent); /* xor hashing */
794
795 if ( htabof (i) == fcode )
796 {
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;
804probe:
805 if ( (i -= disp) < 0 )
806 i += hsize_reg;
807
808 if ( htabof (i) == fcode )
809 {
810 ent = codetabof (i);
811 continue;
812 }
813 if ( (long)htabof (i) > 0 )
814 goto probe;
815nomatch:
816 output ( (code_int) ent );
817 out_count++;
818 ent = c;
819#ifdef SIGNED_COMPARE_SLOW
820 if ( (unsigned) free_ent < (unsigned) maxmaxcode)
821#else
822 if ( free_ent < maxmaxcode )
823#endif
824 {
825 codetabof (i) = free_ent++; /* code -> hashtable */
826 htabof (i) = fcode;
827 }
828 else if ( (count_int)in_count >= checkpoint && block_compress )
829 cl_block ();
830 }
831 /*
832 * Put out the final code.
833 */
834 output( (code_int)ent );
835 out_count++;
836 output( (code_int)-1 );
837
838 /*
839 * Print out stats on stderr
840 */
841 if(zcat_flg == 0 && !quiet)
842 {
843#ifdef DEBUG
844 fprintf( stderr,
845 "%ld chars in, %ld codes (%ld bytes) out, compression factor: ",
846 in_count, out_count, bytes_out );
847 prratio( stderr, in_count, bytes_out );
848 fprintf( stderr, "\n");
849 fprintf( stderr, "\tCompression as in compact: " );
850 prratio( stderr, in_count-bytes_out, in_count );
851 fprintf( stderr, "\n");
852 fprintf( stderr, "\tLargest code (of last block) was %d (%d bits)\n",
853 free_ent - 1, n_bits );
854#else /* !DEBUG */
855 fprintf( stderr, "Compression: " );
856 prratio( stderr, in_count-bytes_out, in_count );
857#endif /* DEBUG */
858 }
859 if(bytes_out > in_count) /* exit(2) if no savings */
860 exit_stat = 2;
861 return;
862}
863
864/*****************************************************************
865 * TAG( output )
866 *
867 * Output the given code.
868 * Inputs:
869 * code: A n_bits-bit integer. If == -1, then EOF. This assumes
870 * that n_bits =< (long)wordsize - 1.
871 * Outputs:
872 * Outputs code to the file.
873 * Assumptions:
874 * Chars are 8 bits long.
875 * Algorithm:
876 * Maintain a BITS character long buffer (so that 8 codes will
877 * fit in it exactly). Use the VAX insv instruction to insert each
878 * code in turn. When the buffer fills up empty it and start over.
879 */
880
881static char buf[BITS];
882
883#ifndef vax
884char_type lmask[9] = {0xff, 0xfe, 0xfc, 0xf8, 0xf0, 0xe0, 0xc0, 0x80, 0x00};
885char_type rmask[9] = {0x00, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f, 0xff};
886#endif /* vax */
887void output( code )
888code_int code;
889{
890#ifdef DEBUG
891 static int col = 0;
892#endif /* DEBUG */
893
894 /*
895 * On the VAX, it is important to have the REGISTER declarations
896 * in exactly the order given, or the asm will break.
897 */
898 REGISTER int r_off = offset, bits= n_bits;
899 REGISTER char * bp = buf;
900#ifndef BREAKHIGHC
901#ifdef METAWARE
902 int temp;
903#endif
904#endif
905#ifdef DEBUG
906 if ( verbose )
907 fprintf( stderr, "%5d%c", code,
908 (col+=6) >= 74 ? (col = 0, '\n') : ' ' );
909#endif /* DEBUG */
910 if ( code >= 0 )
911 {
912#ifdef vax
913 /* VAX DEPENDENT!! Implementation on other machines is below.
914 *
915 * Translation: Insert BITS bits from the argument starting at
916 * offset bits from the beginning of buf.
917 */
918 0; /* Work around for pcc -O bug with asm and if stmt */
919 asm( "insv 4(ap),r11,r10,(r9)" );
920#else /* not a vax */
921/*
922 * byte/bit numbering on the VAX is simulated by the following code
923 */
924 /*
925 * Get to the first byte.
926 */
927 bp += (r_off >> 3);
928 r_off &= 7;
929 /*
930 * Since code is always >= 8 bits, only need to mask the first
931 * hunk on the left.
932 */
933#ifndef BREAKHIGHC
934#ifdef METAWARE
935 *bp &= rmask[r_off];
936 temp = (code << r_off) & lmask[r_off];
937 *bp |= temp;
938#else
939 *bp = (*bp & rmask[r_off]) | ((code << r_off) & lmask[r_off]);
940#endif
941#else
942 *bp = (*bp & rmask[r_off]) | ((code << r_off) & lmask[r_off]);
943#endif
944 bp++;
945 bits -= (8 - r_off);
946 code >>= (8 - r_off);
947 /* Get any 8 bit parts in the middle (<=1 for up to 16 bits). */
948 if ( bits >= 8 )
949 {
950 *bp++ = code;
951 code >>= 8;
952 bits -= 8;
953 }
954 /* Last bits. */
955 if(bits)
956 *bp = code;
957#endif /* vax */
958 offset += n_bits;
959 if ( offset == (n_bits << 3) )
960 {
961 bp = buf;
962 bits = n_bits;
963 bytes_out += bits;
964 do
965 putc(*bp++,stdout);
966 while(--bits);
967 offset = 0;
968 }
969
970 /*
971 * If the next entry is going to be too big for the code size,
972 * then increase it, if possible.
973 */
974 if ( free_ent > maxcode || (clear_flg > 0))
975 {
976 /*
977 * Write the whole buffer, because the input side won't
978 * discover the size increase until after it has read it.
979 */
980 if ( offset > 0 )
981 {
982 if( fwrite( buf, (size_t)1, (size_t)n_bits, stdout ) != n_bits)
983 writeerr();
984 bytes_out += n_bits;
985 }
986 offset = 0;
987
988 if ( clear_flg )
989 {
990 maxcode = MAXCODE (n_bits = INIT_BITS);
991 clear_flg = 0;
992 }
993 else
994 {
995 n_bits++;
996 if ( n_bits == maxbits )
997 maxcode = maxmaxcode;
998 else
999 maxcode = MAXCODE(n_bits);
1000 }
1001#ifdef DEBUG
1002 if ( debug )
1003 {
1004 fprintf( stderr, "\nChange to %d bits\n", n_bits );
1005 col = 0;
1006 }
1007#endif /* DEBUG */
1008 }
1009 } else
1010 {
1011 /*
1012 * At EOF, write the rest of the buffer.
1013 */
1014 if ( offset > 0 )
1015 fwrite( buf, (size_t)1, (size_t)(offset + 7) / 8, stdout );
1016 bytes_out += (offset + 7) / 8;
1017 offset = 0;
1018 fflush( stdout );
1019#ifdef DEBUG
1020 if ( verbose )
1021 fprintf( stderr, "\n" );
1022#endif /* DEBUG */
1023 if( ferror( stdout ) )
1024 writeerr();
1025 }
1026}
1027/*
1028 * Decompress stdin to stdout. This routine adapts to the codes in the
1029 * file building the "string" table on-the-fly; requiring no table to
1030 * be stored in the compressed file. The tables used herein are shared
1031 * with those of the compress() routine. See the definitions above.
1032 */
1033
1034void decompress() {
1035 REGISTER char_type *stackp;
1036 REGISTER int finchar;
1037 REGISTER code_int code, oldcode, incode;
1038
1039 /*
1040 * As above, initialize the first 256 entries in the table.
1041 */
1042 maxcode = MAXCODE(n_bits = INIT_BITS);
1043 for ( code = 255; code >= 0; code-- ) {
1044 tab_prefixof(code) = 0;
1045 tab_suffixof(code) = (char_type)code;
1046 }
1047 free_ent = ((block_compress) ? FIRST : 256 );
1048
1049 finchar = oldcode = getcode();
1050 if(oldcode == -1) /* EOF already? */
1051 return; /* Get out of here */
1052 putc( (char)finchar,stdout ); /* first code must be 8 bits = char */
1053 if(ferror(stdout)) /* Crash if can't write */
1054 writeerr();
1055 stackp = de_stack;
1056
1057 while ( (code = getcode()) > -1 ) {
1058
1059 if ( (code == CLEAR) && block_compress ) {
1060 for ( code = 255; code >= 0; code-- )
1061 tab_prefixof(code) = 0;
1062 clear_flg = 1;
1063 free_ent = FIRST - 1;
1064 if ( (code = getcode ()) == -1 ) /* O, untimely death! */
1065 break;
1066 }
1067 incode = code;
1068 /*
1069 * Special case for KwKwK string.
1070 */
1071 if ( code >= free_ent ) {
1072 *stackp++ = finchar;
1073 code = oldcode;
1074 }
1075
1076 /*
1077 * Generate output characters in reverse order
1078 */
1079#ifdef SIGNED_COMPARE_SLOW
1080 while ( ((unsigned long)code) >= ((unsigned long)256) ) {
1081#else
1082 while ( code >= 256 ) {
1083#endif
1084 *stackp++ = tab_suffixof(code);
1085 code = tab_prefixof(code);
1086 }
1087 *stackp++ = finchar = tab_suffixof(code);
1088
1089 /*
1090 * And put them out in forward order
1091 */
1092 do
1093 putc ( *--stackp ,stdout);
1094 while ( stackp > de_stack );
1095
1096 /*
1097 * Generate the new entry.
1098 */
1099 if ( (code=free_ent) < maxmaxcode )
1100 {
1101 tab_prefixof(code) = (unsigned short)oldcode;
1102 tab_suffixof(code) = finchar;
1103 free_ent = code+1;
1104 }
1105 /*
1106 * Remember previous code.
1107 */
1108 oldcode = incode;
1109 }
1110 fflush( stdout );
1111 if(ferror(stdout))
1112 writeerr();
1113}
1114
1115/*****************************************************************
1116 * TAG( getcode )
1117 *
1118 * Read one code from the standard input. If EOF, return -1.
1119 * Inputs:
1120 * stdin
1121 * Outputs:
1122 * code or -1 is returned.
1123 */
1124
1125code_int
1126getcode()
1127{
1128 /*
1129 * On the VAX, it is important to have the REGISTER declarations
1130 * in exactly the order given, or the asm will break.
1131 */
1132 REGISTER code_int code;
1133 static int offset = 0, size = 0;
1134 static char_type buf[BITS];
1135 REGISTER int r_off, bits;
1136 REGISTER char_type *bp = buf;
1137
1138 if ( clear_flg > 0 || offset >= size || free_ent > maxcode )
1139 {
1140 /*
1141 * If the next entry will be too big for the current code
1142 * size, then we must increase the size. This implies reading
1143 * a new buffer full, too.
1144 */
1145 if ( free_ent > maxcode )
1146 {
1147 n_bits++;
1148 if ( n_bits == maxbits )
1149 maxcode = maxmaxcode; /* won't get any bigger now */
1150 else
1151 maxcode = MAXCODE(n_bits);
1152 }
1153 if ( clear_flg > 0)
1154 {
1155 maxcode = MAXCODE (n_bits = INIT_BITS);
1156 clear_flg = 0;
1157 }
1158 size = fread( buf, (size_t)1, (size_t)n_bits, stdin );
1159 if ( size <= 0 )
1160 return -1; /* end of file */
1161 offset = 0;
1162 /* Round size down to integral number of codes */
1163 size = (size << 3) - (n_bits - 1);
1164 }
1165 r_off = offset;
1166 bits = n_bits;
1167#ifdef vax
1168 asm( "extzv r10,r9,(r8),r11" );
1169#else /* not a vax */
1170 /*
1171 * Get to the first byte.
1172 */
1173 bp += (r_off >> 3);
1174 r_off &= 7;
1175 /* Get first part (low order bits) */
1176#ifdef NO_UCHAR
1177 code = ((*bp++ >> r_off) & rmask[8 - r_off]) & 0xff;
1178#else
1179 code = (*bp++ >> r_off);
1180#endif /* NO_UCHAR */
1181 bits -= (8 - r_off);
1182 r_off = 8 - r_off; /* now, offset into code word */
1183 /* Get any 8 bit parts in the middle (<=1 for up to 16 bits). */
1184 if ( bits >= 8 )
1185 {
1186#ifdef NO_UCHAR
1187 code |= (*bp++ & 0xff) << r_off;
1188#else
1189 code |= *bp++ << r_off;
1190#endif /* NO_UCHAR */
1191 r_off += 8;
1192 bits -= 8;
1193 }
1194 /* high order bits. */
1195 code |= (*bp & rmask[bits]) << r_off;
1196#endif /* vax */
1197 offset += n_bits;
1198
1199 return code;
1200}
1201
1202#ifndef AZTEC86
1203char *
1204strrchr(s, c) /* For those who don't have it in libc.a */
1205REGISTER char *s, c;
1206{
1207 char *p;
1208 for (p = NULL; *s; s++)
1209 if (*s == c)
1210 p = s;
1211 return(p);
1212}
1213#endif
1214
1215
1216#ifndef METAWARE
1217#ifdef DEBUG
1218printcodes()
1219{
1220 /*
1221 * Just print out codes from input file. For debugging.
1222 */
1223 code_int code;
1224 int col = 0, bits;
1225
1226 bits = n_bits = INIT_BITS;
1227 maxcode = MAXCODE(n_bits);
1228 free_ent = ((block_compress) ? FIRST : 256 );
1229 while ( ( code = getcode() ) >= 0 ) {
1230 if ( (code == CLEAR) && block_compress ) {
1231 free_ent = FIRST - 1;
1232 clear_flg = 1;
1233 }
1234 else if ( free_ent < maxmaxcode )
1235 free_ent++;
1236 if ( bits != n_bits ) {
1237 fprintf(stderr, "\nChange to %d bits\n", n_bits );
1238 bits = n_bits;
1239 col = 0;
1240 }
1241 fprintf(stderr, "%5d%c", code, (col+=6) >= 74 ? (col = 0, '\n') : ' ' );
1242 }
1243 putc( '\n', stderr );
1244 exit( 0 );
1245}
1246#ifdef DEBUG2
1247code_int sorttab[1<<BITS]; /* sorted pointers into htab */
1248#define STACK_SIZE 500
1249static char stack[STACK_SIZE];
1250/* dumptab doesn't use main stack now -prevents distressing crashes */
1251dump_tab() /* dump string table */
1252{
1253 REGISTER int i, first;
1254 REGISTER ent;
1255 int stack_top = STACK_SIZE;
1256 REGISTER c;
1257
1258 if(do_decomp == 0) { /* compressing */
1259 REGISTER int flag = 1;
1260
1261 for(i=0; i<hsize; i++) { /* build sort pointers */
1262 if((long)htabof(i) >= 0) {
1263 sorttab[codetabof(i)] = i;
1264 }
1265 }
1266 first = block_compress ? FIRST : 256;
1267 for(i = first; i < free_ent; i++) {
1268 fprintf(stderr, "%5d: \"", i);
1269 stack[--stack_top] = '\n';
1270 stack[--stack_top] = '"'; /* " */
1271 stack_top = in_stack((int)(htabof(sorttab[i])>>maxbits)&0xff,
1272 stack_top);
1273 for(ent=htabof(sorttab[i]) & ((1<<maxbits)-1);
1274 ent > 256;
1275 ent=htabof(sorttab[ent]) & ((1<<maxbits)-1)) {
1276 stack_top = in_stack((int)(htabof(sorttab[ent]) >> maxbits),
1277 stack_top);
1278 }
1279 stack_top = in_stack(ent, stack_top);
1280 fwrite( &stack[stack_top], (size_t)1, (size_t)(STACK_SIZE-stack_top), stderr);
1281 stack_top = STACK_SIZE;
1282 }
1283 } else if(!debug) { /* decompressing */
1284
1285 for ( i = 0; i < free_ent; i++ ) {
1286 ent = i;
1287 c = tab_suffixof(ent);
1288 if ( isascii(c) && isprint(c) )
1289 fprintf( stderr, "%5d: %5d/'%c' \"",
1290 ent, tab_prefixof(ent), c );
1291 else
1292 fprintf( stderr, "%5d: %5d/\\%03o \"",
1293 ent, tab_prefixof(ent), c );
1294 stack[--stack_top] = '\n';
1295 stack[--stack_top] = '"'; /* " */
1296 for ( ; ent != NULL;
1297 ent = (ent >= FIRST ? tab_prefixof(ent) : NULL) ) {
1298 stack_top = in_stack(tab_suffixof(ent), stack_top);
1299 }
1300 fwrite( &stack[stack_top], (size_t)1, (size_t)(STACK_SIZE - stack_top), stderr );
1301 stack_top = STACK_SIZE;
1302 }
1303 }
1304}
1305
1306int
1307in_stack(c, stack_top)
1308 REGISTER int c, stack_top;
1309{
1310 if ( (isascii(c) && isprint(c) && c != '\\') || c == ' ' ) {
1311 stack[--stack_top] = c;
1312 } else {
1313 switch( c ) {
1314 case '\n': stack[--stack_top] = 'n'; break;
1315 case '\t': stack[--stack_top] = 't'; break;
1316 case '\b': stack[--stack_top] = 'b'; break;
1317 case '\f': stack[--stack_top] = 'f'; break;
1318 case '\r': stack[--stack_top] = 'r'; break;
1319 case '\\': stack[--stack_top] = '\\'; break;
1320 default:
1321 stack[--stack_top] = '0' + c % 8;
1322 stack[--stack_top] = '0' + (c / 8) % 8;
1323 stack[--stack_top] = '0' + c / 64;
1324 break;
1325 }
1326 stack[--stack_top] = '\\';
1327 }
1328 if (stack_top<0) {
1329 fprintf(stderr,"dump_tab stack overflow!!!\n");
1330 exit(1);
1331 }
1332 return stack_top;
1333}
1334#else
1335dump_tab() {}
1336#endif /* DEBUG2 */
1337#endif /* DEBUG */
1338#endif /* METAWARE */
1339
1340void writeerr()
1341{
1342 perror ( ofname );
1343 unlink ( ofname );
1344 exit ( 1 );
1345}
1346
1347void copystat(ifname, ofname)
1348char *ifname, *ofname;
1349{
1350 struct stat statbuf;
1351 int mode;
1352#ifndef AZTEC86
1353 time_t timep[2];
1354#else
1355 unsigned long timep[2];
1356#endif
1357 fflush(stdout);
1358 close(fileno(stdout));
1359 if (stat(ifname, &statbuf))
1360 { /* Get stat on input file */
1361 perror(ifname);
1362 return;
1363 }
1364#ifndef PCDOS
1365 /* meddling with UNIX-style file modes */
1366 if ((statbuf.st_mode & S_IFMT/*0170000*/) != S_IFREG/*0100000*/)
1367 {
1368 if(quiet)
1369 fprintf(stderr, "%s: ", ifname);
1370 fprintf(stderr, " -- not a regular file: unchanged");
1371 exit_stat = 1;
1372 } else if (statbuf.st_nlink > 1)
1373 {
1374 if(quiet)
1375 fprintf(stderr, "%s: ", ifname);
1376 fprintf(stderr, " -- has %d other links: unchanged",
1377 statbuf.st_nlink - 1);
1378 exit_stat = 1;
1379 } else
1380#endif
1381 if (exit_stat == 2 && (!force))
1382 { /* No compression: remove file.Z */
1383 if(!quiet)
1384 fprintf(stderr, " -- file unchanged");
1385 } else
1386 { /* ***** Successful Compression ***** */
1387 exit_stat = 0;
1388#ifndef PCDOS
1389 mode = statbuf.st_mode & 07777;
1390#else
1391 mode = statbuf.st_attr & 07777;
1392#endif
1393 if (chmod(ofname, mode)) /* Copy modes */
1394 perror(ofname);
1395#ifndef PCDOS
1396 chown(ofname, statbuf.st_uid, statbuf.st_gid); /* Copy ownership */
1397 timep[0] = statbuf.st_atime;
1398 timep[1] = statbuf.st_mtime;
1399#else
1400 timep[0] = statbuf.st_mtime;
1401 timep[1] = statbuf.st_mtime;
1402#endif
1403 utime(ofname, (struct utimbuf *)timep); /* Update last accessed and modified times */
1404/*
1405 if (unlink(ifname))
1406 perror(ifname);
1407*/
1408 if(!quiet)
1409 if(do_decomp == 0)
1410 fprintf(stderr, " -- compressed to %s", ofname);
1411 else
1412 fprintf(stderr, " -- decompressed to %s", ofname);
1413 return; /* Successful return */
1414 }
1415
1416 /* Unsuccessful return -- one of the tests failed */
1417 if (unlink(ofname))
1418 perror(ofname);
1419}
1420/*
1421 * This routine returns 1 if we are running in the foreground and stderr
1422 * is a tty.
1423 */
1424int foreground()
1425{
1426#ifndef METAWARE
1427 if(bgnd_flag) { /* background? */
1428 return(0);
1429 } else { /* foreground */
1430#endif
1431 if(isatty(2)) { /* and stderr is a tty */
1432 return(1);
1433 } else {
1434 return(0);
1435 }
1436#ifndef METAWARE
1437 }
1438#endif
1439}
1440#ifndef METAWARE
1441void onintr (dummy)
1442int dummy; /* to keep the compiler happy */
1443{
1444 (void)signal(SIGINT,SIG_IGN);
1445 unlink ( ofname );
1446 exit ( 1 );
1447}
1448
1449void oops (dummy) /* wild pointer -- assume bad input */
1450int dummy; /* to keep the compiler happy */
1451{
1452 (void)signal(SIGSEGV,SIG_IGN);
1453 if ( do_decomp == 1 )
1454 fprintf ( stderr, "uncompress: corrupt input\n" );
1455 unlink ( ofname );
1456 exit ( 1 );
1457}
1458#endif
1459void cl_block () /* table clear for block compress */
1460{
1461 REGISTER long int rat;
1462
1463 checkpoint = in_count + CHECK_GAP;
1464#ifdef DEBUG
1465 if ( debug ) {
1466 fprintf ( stderr, "count: %ld, ratio: ", in_count );
1467 prratio ( stderr, in_count, bytes_out );
1468 fprintf ( stderr, "\n");
1469 }
1470#endif /* DEBUG */
1471
1472 if(in_count > 0x007fffff) { /* shift will overflow */
1473 rat = bytes_out >> 8;
1474 if(rat == 0) { /* Don't divide by zero */
1475 rat = 0x7fffffff;
1476 } else {
1477 rat = in_count / rat;
1478 }
1479 } else {
1480 rat = (in_count << 8) / bytes_out; /* 8 fractional bits */
1481 }
1482 if ( rat > ratio ) {
1483 ratio = rat;
1484 } else {
1485 ratio = 0;
1486#ifdef DEBUG
1487 if(verbose)
1488 dump_tab(); /* dump string table */
1489#endif
1490 cl_hash ( (count_int) hsize );
1491 free_ent = FIRST;
1492 clear_flg = 1;
1493 output ( (code_int) CLEAR );
1494#ifdef DEBUG
1495 if(debug)
1496 fprintf ( stderr, "clear\n" );
1497#endif /* DEBUG */
1498 }
1499}
1500
1501void cl_hash(hsize) /* reset code table */
1502 REGISTER count_int hsize;
1503{
1504#ifdef AZTEC86
1505#ifdef PCDOS
1506 /* This function only in PC-DOS lib, not in MINIX lib */
1507 memset(htab,-1, hsize * sizeof(count_int));
1508#else
1509/* MINIX and all non-PC machines do it this way */
1510#ifndef XENIX_16 /* Normal machine */
1511 REGISTER count_int *htab_p = htab+hsize;
1512#else
1513 REGISTER j;
1514 REGISTER long k = hsize;
1515 REGISTER count_int *htab_p;
1516#endif
1517 REGISTER long i;
1518 REGISTER long m1 = -1;
1519
1520#ifdef XENIX_16
1521 for(j=0; j<=8 && k>=0; j++,k-=8192)
1522 {
1523 i = 8192;
1524 if(k < 8192)
1525 {
1526 i = k;
1527 }
1528 htab_p = &(htab[j][i]);
1529 i -= 16;
1530 if(i > 0)
1531 {
1532#else
1533 i = hsize - 16;
1534#endif
1535 do
1536 { /* might use Sys V memset(3) here */
1537 *(htab_p-16) = m1;
1538 *(htab_p-15) = m1;
1539 *(htab_p-14) = m1;
1540 *(htab_p-13) = m1;
1541 *(htab_p-12) = m1;
1542 *(htab_p-11) = m1;
1543 *(htab_p-10) = m1;
1544 *(htab_p-9) = m1;
1545 *(htab_p-8) = m1;
1546 *(htab_p-7) = m1;
1547 *(htab_p-6) = m1;
1548 *(htab_p-5) = m1;
1549 *(htab_p-4) = m1;
1550 *(htab_p-3) = m1;
1551 *(htab_p-2) = m1;
1552 *(htab_p-1) = m1;
1553 htab_p -= 16;
1554 } while ((i -= 16) >= 0);
1555#ifdef XENIX_16
1556 }
1557 }
1558#endif
1559 for ( i += 16; i > 0; i-- )
1560 *--htab_p = m1;
1561#endif
1562#endif
1563}
1564
1565void prratio(stream, num, den)
1566FILE *stream;
1567long int num;
1568long int den;
1569{
1570 REGISTER int q; /* Doesn't need to be long */
1571 if(num > 214748L)
1572 { /* 2147483647/10000 */
1573 q = (int)(num / (den / 10000L));
1574 } else
1575 {
1576 q = (int)(10000L * num / den); /* Long calculations, though */
1577 }
1578 if (q < 0)
1579 {
1580 putc('-', stream);
1581 q = -q;
1582 }
1583 fprintf(stream, "%d.%02d%c", q / 100, q % 100, '%');
1584}
1585
1586void version()
1587{
1588 fprintf(stderr, "compress 4.1\n");
1589 fprintf(stderr, "Options: ");
1590#ifdef vax
1591 fprintf(stderr, "vax, ");
1592#endif
1593#ifdef _MINIX
1594 fprintf(stderr, "MINIX, ");
1595#endif
1596#ifdef NO_UCHAR
1597 fprintf(stderr, "NO_UCHAR, ");
1598#endif
1599#ifdef SIGNED_COMPARE_SLOW
1600 fprintf(stderr, "SIGNED_COMPARE_SLOW, ");
1601#endif
1602#ifdef XENIX_16
1603 fprintf(stderr, "XENIX_16, ");
1604#endif
1605#ifdef COMPATIBLE
1606 fprintf(stderr, "COMPATIBLE, ");
1607#endif
1608#ifdef DEBUG
1609 fprintf(stderr, "DEBUG, ");
1610#endif
1611#ifdef BSD4_2
1612 fprintf(stderr, "BSD4_2, ");
1613#endif
1614 fprintf(stderr, "BITS = %d\n", BITS);
1615}
1616/* End of text from uok.UUCP:net.sources */
1617
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