Source Code 1994 March/Source_Code_CD-ROM_Walnut_Creek_March_1994.iso/compsrcs/misc/volume31/zip19/part05

Text File | 1992-08-22 | 60.6 KB | 1,290 lines

Newsgroups: comp.sources.misc
From: [e-mail] (Info-ZIP group)
Subject:  v31i097:  zip19 - Info-ZIP portable Zip, version 1.9, Part05/11
Message-ID: <[e-mail]>
X-Md4-Signature: f24a52a163a98ace3a9e3abdcc1ead76
Date: Sun, 23 Aug 1992 06:46:51 GMT
Approved: [e-mail]

Submitted-by: [e-mail] (Info-ZIP group)
Posting-number: Volume 31, Issue 97
Archive-name: zip19/part05
Supersedes: zip: Volume 23, Issue 88-96
Environment: UNIX, VMS, OS/2, MS-DOS, MACINTOSH, WIN-NT, LINUX, MINIX, XOS, !AMIGA, ATARI, symlink, SGI, DEC, Cray, Convex, Amdahl, Sun, PC

#! /bin/sh
# This is a shell archive.  Remove anything before this line, then feed it
# into a shell via "sh file" or similar.  To overwrite existing files,
# type "sh file -c".
# The tool that generated this appeared in the comp.sources.unix newsgroup;
# send mail to [e-mail] if you want that tool.
# Contents:  deflate.c msdos/tcconfig.tc.UU os2/os2zip.c.UU
# Wrapped by kent@sparky on Sun Aug 23 01:00:44 1992
PATH=/bin:/usr/bin:/usr/ucb ; export PATH
echo If this archive is complete, you will see the following message:
echo '          "shar: End of archive 5 (of 11)."'
if test -f 'deflate.c' -a "${1}" != "-c" ; then
  echo shar: Will not clobber existing file \"'deflate.c'\"
else
  echo shar: Extracting \"'deflate.c'\" \(26162 characters\)
  sed "s/^X//" >'deflate.c' <<'END_OF_FILE'
X/*
X
X Copyright (C) 1990-1992 Mark Adler, Richard B. Wales, Jean-loup Gailly,
X Kai Uwe Rommel and Igor Mandrichenko.
X Permission is granted to any individual or institution to use, copy, or
X redistribute this software so long as all of the original files are included
X unmodified, that it is not sold for profit, and that this copyright notice
X is retained.
X
X*/
X
X/*
X *  deflate.c by Jean-loup Gailly.
X *
X *  PURPOSE
X *
X *      Identify new text as repetitions of old text within a fixed-
X *      length sliding window trailing behind the new text.
X *
X *  DISCUSSION
X *
X *      The "deflation" process depends on being able to identify portions
X *      of the input text which are identical to earlier input (within a
X *      sliding window trailing behind the input currently being processed).
X *
X *      The most straightforward technique turns out to be the fastest for
X *      most input files: try all possible matches and select the longest.
X *      The key feature is of this algorithm is that insertion and deletions
X *      from the string dictionary are very simple and thus fast. Insertions
X *      and deletions are performed at each input character, whereas string
X *      matches are performed only when the previous match ends. So it is
X *      preferable to spend more time in matches to allow very fast string
X *      insertions and deletions. The matching algorithm for small strings
X *      is inspired from that of Rabin & Karp. A brute force approach is
X *      used to find longer strings when a small match has been found.
X *      A similar algorithm is used in comic (by Jan-Mark Wams) and freeze
X *      (by Leonid Broukhis).
X *         A previous version of this file used a more sophisticated algorithm
X *      (by Fiala and Greene) which is guaranteed to run in linear amortized
X *      time, but has a larger average cost and uses more memory. However
X *      the F&G algorithm may be faster for some highly redundant files if
X *      the parameter max_chain_length (described below) is too large.
X *
X *  ACKNOWLEDGEMENTS
X *
X *      The idea of lazy evaluation of matches is due to Jan-Mark Wams, and
X *      I found it in 'freeze' written by Leonid Broukhis.
X *      Thanks to many info-zippers for bug reports and testing.
X *
X *  REFERENCES
X *
X *      APPNOTE.TXT documentation file in PKZIP 2.0 distribution.
X *
X *      A description of the Rabin and Karp algorithm is given in the book
X *         "Algorithms" by R. Sedgewick, Addison-Wesley, p252.
X *
X *      Fiala,E.R., and Greene,D.H.
X *         Data Compression with Finite Windows, Comm.ACM, 32,4 (1989) 490-595
X *
X *  INTERFACE
X *
X *      void lm_init (int pack_level, ush *flags)
X *          Initialize the "longest match" routines for a new file
X *
X *      ulg deflate (void)
X *          Processes a new input file and return its compressed length. Sets
X *          the compressed length, crc, deflate flags and internal file
X *          attributes.
X */
X
X#include "zip.h"
X
X/* ===========================================================================
X * Configuration parameters
X */
X
X/* Compile with MEDIUM_MEM to reduce the memory requirements or
X * with SMALL_MEM to use as little memory as possible.
X * Warning: defining these symbols affects MATCH_BUFSIZE and HASH_BITS
X * (see below) and thus affects the compression ratio. The compressed output
X * is still correct, and might even be smaller in some cases.
X */
X
X#ifdef SMALL_MEM
X#   define HASH_BITS  13  /* Number of bits used to hash strings */
X#else
X#ifdef MEDIUM_MEM
X#   define HASH_BITS  14
X#else
X#   define HASH_BITS  15
X   /* For portability to 16 bit machines, do not use values above 15. */
X#endif
X#endif
X
X#define HASH_SIZE (unsigned)(1<<HASH_BITS)
X#define HASH_MASK (HASH_SIZE-1)
X#define WMASK     (WSIZE-1)
X/* HASH_SIZE and WSIZE must be powers of two */
X
X#define NIL 0
X/* Tail of hash chains */
X
X#define FAST 4
X#define SLOW 2
X/* speed options for the general purpose bit flag */
X
X#ifndef TOO_FAR
X#  define TOO_FAR 4096
X#endif
X/* Matches of length 3 are discarded if their distance exceeds TOO_FAR */
X
X/* ===========================================================================
X * Local data used by the "longest match" routines.
X */
X
Xtypedef ush Pos;
Xtypedef unsigned IPos;
X/* A Pos is an index in the character window. We use short instead of int to
X * save space in the various tables. IPos is used only for parameter passing.
X */
X
X#ifndef DYN_ALLOC
X  uch    far window[2L*WSIZE];
X  /* Sliding window. Input bytes are read into the second half of the window,
X   * and move to the first half later to keep a dictionary of at least WSIZE
X   * bytes. With this organization, matches are limited to a distance of
X   * WSIZE-MAX_MATCH bytes, but this ensures that IO is always
X   * performed with a length multiple of the block size. Also, it limits
X   * the window size to 64K, which is quite useful on MSDOS.
X   * To do: limit the window size to WSIZE+BSZ if SMALL_MEM (the code would
X   * be less efficient since the data would have to be copied WSIZE/BSZ times)
X   */
X  Pos    far prev[WSIZE];
X  /* Link to older string with same hash index. To limit the size of this
X   * array to 64K, this link is maintained only for the last 32K strings.
X   * An index in this array is thus a window index modulo 32K.
X   */
X  Pos    far head[HASH_SIZE];
X  /* Heads of the hash chains or NIL */
X#else
X  uch    far * near window = NULL;
X  Pos    far * near prev   = NULL;
X  Pos    far * near head;
X#endif
X
Xlong block_start;
X/* window position at the beginning of the current output block. Gets
X * negative when the window is moved backwards.
X */
X
Xlocal unsigned near ins_h;  /* hash index of string to be inserted */
X
X#define H_SHIFT  ((HASH_BITS+MIN_MATCH-1)/MIN_MATCH)
X/* Number of bits by which ins_h and del_h must be shifted at each
X * input step. It must be such that after MIN_MATCH steps, the oldest
X * byte no longer takes part in the hash key, that is:
X *   H_SHIFT * MIN_MATCH >= HASH_BITS
X */
X
Xunsigned int near prev_length;
X/* Length of the best match at previous step. Matches not greater than this
X * are discarded. This is used in the lazy match evaluation.
X */
X
X      unsigned near strstart;      /* start of string to insert */
X      unsigned near match_start;   /* start of matching string */
Xlocal int      near eofile;        /* flag set at end of input file */
Xlocal unsigned near lookahead;     /* number of valid bytes ahead in window */
X
Xunsigned near max_chain_length;
X/* To speed up deflation, hash chains are never searched beyond this length.
X * A higher limit improves compression ratio but degrades the speed.
X */
X
Xlocal unsigned int max_lazy_match;
X/* Attempt to find a better match only when the current match is strictly
X * smaller than this value.
X */
X
Xint near good_match;
X/* Use a faster search when the previous match is longer than this */
X
X
X/* Values for max_lazy_match, good_match and max_chain_length, depending on
X * the desired pack level (0..9). The values given below have been tuned to
X * exclude worst case performance for pathological files. Better values may be
X * found for specific files.
X */
Xtypedef struct config {
X   int good_length;
X   int max_lazy;
X   unsigned max_chain;
X   uch flag;
X} config;
X
Xlocal config configuration_table[10] = {
X/*      good lazy chain flag */
X/* 0 */ {0,    0,    0,  0},     /* store only */
X/* 1 */ {4,    4,   16,  FAST},  /* maximum speed  */
X/* 2 */ {6,    8,   16,  0},
X/* 3 */ {8,   16,   32,  0},
X/* 4 */ {8,   32,   64,  0},
X/* 5 */ {8,   64,  128,  0},
X/* 6 */ {8,  128,  256,  0},
X/* 7 */ {8,  128,  512,  0},
X/* 8 */ {32, 258, 1024,  0},
X/* 9 */ {32, 258, 4096,  SLOW}}; /* maximum compression */
X
X/* Note: the current code requires max_lazy >= MIN_MATCH and max_chain >= 4
X * but these restrictions can easily be removed at a small cost.
X */
X
X#define EQUAL 0
X/* result of memcmp for equal strings */
X
X/* ===========================================================================
X *  Prototypes for local functions. Use asm version by default for
X *  MSDOS but not Unix. However the asm version version is recommended
X *  for 386 Unix.
X */
X#ifdef ATARI_ST
X#  undef MSDOS /* avoid the processor specific parts */
X#endif
X#if defined(MSDOS) && !defined(NO_ASM) && !defined(ASM)
X#  define ASM
X#endif
X
Xlocal void fill_window   OF((void));
X      int  longest_match OF((IPos cur_match));
X#ifdef ASM
X      void match_init OF((void)); /* asm code initialization */
X#endif
X
X#ifdef DEBUG
Xlocal  void check_match OF((IPos start, IPos match, int length));
X#endif
X
X#define MIN(a,b) ((a) <= (b) ? (a) : (b))
X/* The arguments must not have side effects. */
X
X/* ===========================================================================
X * Update a hash value with the given input byte
X * IN  assertion: all calls to to UPDATE_HASH are made with consecutive
X *    input characters, so that a running hash key can be computed from the
X *    previous key instead of complete recalculation each time.
X */
X#define UPDATE_HASH(h,c) (h = (((h)<<H_SHIFT) ^ (c)) & HASH_MASK)
X
X/* ===========================================================================
X * Insert string s in the dictionary and set match_head to the previous head
X * of the hash chain (the most recent string with same hash key). Return
X * the previous length of the hash chain.
X * IN  assertion: all calls to to INSERT_STRING are made with consecutive
X *    input characters and the first MIN_MATCH bytes of s are valid
X *    (except for the last MIN_MATCH-1 bytes of the input file).
X */
X#define INSERT_STRING(s, match_head) \
X   (UPDATE_HASH(ins_h, window[(s) + MIN_MATCH-1]), \
X    prev[(s) & WMASK] = match_head = head[ins_h], \
X    head[ins_h] = (s))
X
X/* ===========================================================================
X * Initialize the "longest match" routines for a new file
X */
Xvoid lm_init (pack_level, flags)
X    int pack_level; /* 0: store, 1: best speed, 9: best compression */
X    ush *flags;     /* general purpose bit flag */
X{
X    register unsigned j;
X
X    if (pack_level < 1 || pack_level > 9) error("bad pack level");
X
X    /* Use dynamic allocation if compiler does not like big static arrays: */
X#ifdef DYN_ALLOC
X    if (window == NULL) {
X        window = (uch far*) fcalloc(WSIZE,   2*sizeof(uch));
X        prev   = (Pos far*) fcalloc(WSIZE,     sizeof(Pos));
X        head   = (Pos far*) fcalloc(HASH_SIZE, sizeof(Pos));
X
X        if (window == NULL || prev == NULL || head == NULL) {
X            err(ZE_MEM, "window allocation");
X        }
X    }
X#endif /* DYN_ALLOC */
X#ifdef ASM
X    match_init(); /* initialize the asm code */
X#endif
X    /* Initialize the hash table. */
X    for (j = 0;  j < HASH_SIZE; j++) head[j] = NIL;
X    /* prev will be initialized on the fly */
X
X    /* Set the default configuration parameters:
X     */
X    max_lazy_match   = configuration_table[pack_level].max_lazy;
X    good_match       = configuration_table[pack_level].good_length;
X    max_chain_length = configuration_table[pack_level].max_chain;
X    *flags          |= configuration_table[pack_level].flag;
X    /* ??? reduce max_chain_length for binary files */
X
X    strstart = 0;
X    block_start = 0L;
X
X#if defined(MSDOS) && !defined(__32BIT__)
X    /* Can't read a 64K block under MSDOS */
X    lookahead = read_buf((char*)window, (unsigned)WSIZE);
X#else
X    lookahead = read_buf((char*)window, 2*WSIZE);
X#endif
X    if (lookahead == 0 || lookahead == (unsigned)EOF) {
X       eofile = 1, lookahead = 0;
X       return;
X    }
X    eofile = 0;
X    /* Make sure that we always have enough lookahead. This is important
X     * if input comes from a device such as a tty.
X     */
X    while (lookahead < MIN_LOOKAHEAD && !eofile) fill_window();
X
X    ins_h = 0;
X    for (j=0; j<MIN_MATCH-1; j++) UPDATE_HASH(ins_h, window[j]);
X    /* If lookahead < MIN_MATCH, ins_h is garbage, but this is
X     * not important since only literal bytes will be emitted.
X     */
X}
X
X/* ===========================================================================
X * Set match_start to the longest match starting at the given string and
X * return its length. Matches shorter or equal to prev_length are discarded,
X * in which case the result is equal to prev_length and match_start is
X * garbage.
X * IN assertions: cur_match is the head of the hash chain for the current
X *   string (strstart) and its distance is <= MAX_DIST, and prev_length >= 1
X */
X#ifndef ASM
X/* For MSDOS, OS/2 and 386 Unix, an optimized version is in match.asm. The code
X * is functionally equivalent, so you can use the C version if desired.
X */
Xint longest_match(cur_match)
X    IPos cur_match;                             /* current match */
X{
X    unsigned chain_length = max_chain_length;   /* max hash chain length */
X    register uch far *scan = window + strstart; /* current string */
X    register uch far *match = scan;             /* matched string */
X    register int len;                           /* length of current match */
X    int best_len = prev_length;                 /* best match length so far */
X    IPos limit = strstart > (IPos)MAX_DIST ? strstart - (IPos)MAX_DIST : NIL;
X    /* Stop when cur_match becomes <= limit. To simplify the code,
X     * we prevent matches with the string of window index 0.
X     */
X#ifdef UNALIGNED_OK
X    register ush scan_start = *(ush*)scan;
X    register ush scan_end   = *(ush*)(scan+best_len-1);
X#else
X    register uch scan_start = *scan;
X    register uch scan_end1  = scan[best_len-1];
X    register uch scan_end   = scan[best_len];
X#endif
X
X    /* Do not waste too much time if we already have a good match: */
X    if (prev_length >= good_match) {
X        chain_length >>= 2;
X    }
X
X    do {
X        Assert(cur_match < strstart, "no future");
X        match = window + cur_match;
X
X        /* Skip to next match if the match length cannot increase
X         * or if the match length is less than 2:
X         */
X#if (defined(UNALIGNED_OK) && HASH_BITS >= 8)
X        /* This code assumes sizeof(unsigned short) == 2 and
X         * sizeof(unsigned long) == 4. Do not use UNALIGNED_OK if your
X         * compiler uses different sizes.
X         */
X        if (*(ush*)(match+best_len-1) != scan_end ||
X            *(ush*)match != scan_start) continue;
X
X        len = MIN_MATCH - 4;
X        /* It is not necessary to compare scan[2] and match[2] since they are
X         * always equal when the other bytes match, given that the hash keys
X         * are equal and that HASH_BITS >= 8.
X         */
X        do {} while ((len+=4) < MAX_MATCH-3 &&
X                     *(ulg*)(scan+len) == *(ulg*)(match+len));
X        /* The funny do {} generates better code for most compilers */
X
X        if (*(ush*)(scan+len) == *(ush*)(match+len)) len += 2;
X        if (scan[len] == match[len]) len++;
X
X#else /* UNALIGNED_OK */
X        if (match[best_len] != scan_end ||
X            match[best_len-1] != scan_end1 || *match != scan_start)
X           continue;
X        /* It is not necessary to compare scan[1] and match[1] since they
X         * are always equal when the other bytes match, given that
X         * the hash keys are equal and that h_shift+8 <= HASH_BITS,
X         * that is, when the last byte is entirely included in the hash key.
X         * The condition is equivalent to
X         *       (HASH_BITS+2)/3 + 8 <= HASH_BITS
X         * or: HASH_BITS >= 13
X         * Also, we check for a match at best_len-1 to get rid quickly of
X         * the match with the suffix of the match made at the previous step,
X         * which is known to fail.
X         */
X#if HASH_BITS >= 13
X        len = 1;
X#else
X        len = 0;
X#endif
X        do {} while (++len < MAX_MATCH && scan[len] == match[len]);
X
X#endif /* UNALIGNED_OK */
X
X        if (len > best_len) {
X            match_start = cur_match;
X            best_len = len;
X            if (len == MAX_MATCH) break;
X#ifdef UNALIGNED_OK
X            scan_end = *(ush*)(scan+best_len-1);
X#else
X            scan_end1  = scan[best_len-1];
X            scan_end   = scan[best_len];
X#endif
X        }
X    } while (--chain_length != 0 &&
X             (cur_match = prev[cur_match & WMASK]) > limit);
X
X    return best_len;
X}
X#endif /* NO_ASM */
X
X#ifdef DEBUG
X/* ===========================================================================
X * Check that the match at match_start is indeed a match.
X */
Xlocal void check_match(start, match, length)
X    IPos start, match;
X    int length;
X{
X    /* check that the match is indeed a match */
X    if (memcmp((char*)window + match,
X                (char*)window + start, length) != EQUAL) {
X        fprintf(stderr,
X            " start %d, match %d, length %d\n",
X            start, match, length);
X        error("invalid match");
X    }
X    if (verbose > 1) {
X        fprintf(stderr,"\\[%d,%d]", start-match, length);
X        do { putc(window[start++], stderr); } while (--length != 0);
X    }
X}
X#else
X#  define check_match(start, match, length)
X#endif
X
X/* ===========================================================================
X * Fill the window when the lookahead becomes insufficient.
X * Updates strstart and lookahead, and sets eofile if end of input file.
X * IN assertion: lookahead < MIN_LOOKAHEAD && strstart + lookahead > 0
X * OUT assertion: at least one byte has been read, or eofile is set.
X */
Xlocal void fill_window()
X{
X    register unsigned n, m;
X    unsigned more = (unsigned)((ulg)2*WSIZE - (ulg)lookahead - (ulg)strstart);
X    /* Amount of free space at the end of the window. */
X
X    /* If the window is full, move the upper half to the lower one to make
X     * room in the upper half.
X     */
X    if (more == 0) {
X        /* By the IN assertion, the window is not empty so we can't confuse
X         * more == 0 with more == 64K on a 16 bit machine.
X         */
X        memcpy((char*)window, (char*)window+WSIZE, (unsigned)WSIZE);
X        match_start -= WSIZE;
X        strstart    -= WSIZE;
X        /* strstart - WSIZE = WSIZE - lookahead > WSIZE - MIN_LOOKAHEAD
X         * so we now have strstart > MAX_DIST:
X         */
X        Assert (strstart > MAX_DIST, "window slide too early");
X        block_start -= (long) WSIZE;
X
X        for (n = 0; n < HASH_SIZE; n++) {
X            m = head[n];
X            head[n] = (Pos)(m >= WSIZE ? m-WSIZE : NIL);
X        }
X        for (n = 0; n < WSIZE; n++) {
X            m = prev[n];
X            prev[n] = (Pos)(m >= WSIZE ? m-WSIZE : NIL);
X            /* If n is not on any hash chain, prev[n] is garbage but
X             * its value will never be used.
X             */
X        }
X        more = WSIZE;
X        if (verbose) putc('.', stderr);
X
X    } else if (more == (unsigned)EOF) {
X        /* Very unlikely, but possible on 16 bit machine if strstart == 0
X         * and lookahead == 1 (input done one byte at time)
X         */
X        more--;
X    }
X    n = read_buf((char*)window+strstart+lookahead, more);
X    if (n == 0 || n == (unsigned)EOF) {
X        eofile = 1;
X    } else {
X        lookahead += n;
X    }
X}
X
X/* ===========================================================================
X * Flush the current block, with given end-of-file flag.
X * IN assertion: strstart is set to the end of the current match.
X */
X#define FLUSH_BLOCK(eof) \
X   flush_block(block_start >= 0L ? (char*)&window[block_start] : (char*)NULL,\
X               (long)strstart - block_start, (eof))
X
X/* ===========================================================================
X * Processes a new input file and return its compressed length.
X */
X#ifdef NO_LAZY
Xulg deflate()
X{
X    IPos hash_head; /* head of the hash chain */
X    int flush;      /* set if current block must be flushed */
X    unsigned match_length = 0;  /* length of best match */
X
X    prev_length = MIN_MATCH-1;
X    while (lookahead != 0) {
X        /* Insert the string window[strstart .. strstart+2] in the
X         * dictionary, and set hash_head to the head of the hash chain:
X         */
X        INSERT_STRING(strstart, hash_head);
X
X        /* Find the longest match, discarding those <= prev_length.
X         * At this point we have always match_length < MIN_MATCH
X         */
X        if (hash_head != NIL && strstart - hash_head <= MAX_DIST) {
X            /* To simplify the code, we prevent matches with the string
X             * of window index 0 (in particular we have to avoid a match
X             * of the string with itself at the start of the input file).
X             */
X            match_length = longest_match (hash_head);
X            /* longest_match() sets match_start */
X            if (match_length > lookahead) match_length = lookahead;
X        }
X        if (match_length >= MIN_MATCH) {
X            check_match(strstart, match_start, match_length);
X
X            flush = ct_tally(strstart-match_start, match_length - MIN_MATCH);
X
X            lookahead -= match_length;
X            match_length--; /* string at strstart already in hash table */
X            do {
X                strstart++;
X                INSERT_STRING(strstart, hash_head);
X                /* strstart never exceeds WSIZE-MAX_MATCH, so there are
X                 * always MIN_MATCH bytes ahead. If lookahead < MIN_MATCH
X                 * these bytes are garbage, but it does not matter since the
X                 * next lookahead bytes will always be emitted as literals.
X                 */
X            } while (--match_length != 0);
X        } else {
X            /* No match, output a literal byte */
X            flush = ct_tally (0, window[strstart]);
X            lookahead--;
X        }
X        strstart++;
X        if (flush) FLUSH_BLOCK(0), block_start = strstart;
X
X        /* Make sure that we always have enough lookahead, except
X         * at the end of the input file. We need MAX_MATCH bytes
X         * for the next match, plus MIN_MATCH bytes to insert the
X         * string following the next match.
X         */
X        while (lookahead < MIN_LOOKAHEAD && !eofile) fill_window();
X
X    }
X    return FLUSH_BLOCK(1); /* eof */
X}
X#else /* LAZY */
X/* ===========================================================================
X * Same as above, but achieves better compression. We use a lazy
X * evaluation for matches: a match is finally adopted only if there is
X * no better match at the next window position.
X */
Xulg deflate()
X{
X    IPos hash_head;          /* head of hash chain */
X    IPos prev_match;         /* previous match */
X    int flush;               /* set if current block must be flushed */
X    int match_available = 0; /* set if previous match exists */
X    register unsigned match_length = MIN_MATCH-1; /* length of best match */
X#ifdef DEBUG
X    extern ulg isize;        /* byte length of input file, for debug only */
X#endif
X
X    /* Process the input block. */
X    while (lookahead != 0) {
X        /* Insert the string window[strstart .. strstart+2] in the
X         * dictionary, and set hash_head to the head of the hash chain:
X         */
X        INSERT_STRING(strstart, hash_head);
X
X        /* Find the longest match, discarding those <= prev_length.
X         */
X        prev_length = match_length, prev_match = match_start;
X        match_length = MIN_MATCH-1;
X
X        if (hash_head != NIL && prev_length < max_lazy_match &&
X            strstart - hash_head <= MAX_DIST) {
X            /* To simplify the code, we prevent matches with the string
X             * of window index 0 (in particular we have to avoid a match
X             * of the string with itself at the start of the input file).
X             */
X            match_length = longest_match (hash_head);
X            /* longest_match() sets match_start */
X            if (match_length > lookahead) match_length = lookahead;
X            /* Ignore a length 3 match if it is too distant: */
X            if (match_length == MIN_MATCH && strstart-match_start > TOO_FAR){
X                /* If prev_match is also MIN_MATCH, match_start is garbage
X                 * but we will ignore the current match anyway.
X                 */
X                match_length--;
X            }
X        }
X        /* If there was a match at the previous step and the current
X         * match is not better, output the previous match:
X         */
X        if (prev_length >= MIN_MATCH && match_length <= prev_length) {
X
X            check_match(strstart-1, prev_match, prev_length);
X
X            flush = ct_tally(strstart-1-prev_match, prev_length - MIN_MATCH);
X
X            /* Insert in hash table all strings up to the end of the match.
X             * strstart-1 and strstart are already inserted.
X             */
X            lookahead -= prev_length-1;
X            prev_length -= 2;
X            do {
X                strstart++;
X                INSERT_STRING(strstart, hash_head);
X                /* strstart never exceeds WSIZE-MAX_MATCH, so there are
X                 * always MIN_MATCH bytes ahead. If lookahead < MIN_MATCH
X                 * these bytes are garbage, but it does not matter since the
X                 * next lookahead bytes will always be emitted as literals.
X                 */
X            } while (--prev_length != 0);
X            match_available = 0;
X            match_length = MIN_MATCH-1;
X
X        } else if (match_available) {
X            /* If there was no match at the previous position, output a
X             * single literal. If there was a match but the current match
X             * is longer, truncate the previous match to a single literal.
X             */
X            flush = ct_tally (0, window[strstart-1]);
X            Tracevv((stderr,"%c",window[strstart-1]));
X            lookahead--;
X        } else {
X            /* There is no previous match to compare with, wait for
X             * the next step to decide.
X             */
X            match_available = 1;
X            flush = 0;
X            lookahead--;
X        }
X        if (flush) FLUSH_BLOCK(0), block_start = strstart;
X        strstart++;
X        Assert (strstart <= isize && lookahead <= isize, "a bit too far");
X
X        /* Make sure that we always have enough lookahead, except
X         * at the end of the input file. We need MAX_MATCH bytes
X         * for the next match, plus MIN_MATCH bytes to insert the
X         * string following the next match.
X         */
X        while (lookahead < MIN_LOOKAHEAD && !eofile) fill_window();
X    }
X    if (match_available) ct_tally (0, window[strstart-1]);
X
X    return FLUSH_BLOCK(1); /* eof */
X}
X#endif /* LAZY */
END_OF_FILE
  if test 26162 -ne `wc -c <'deflate.c'`; then
    echo shar: \"'deflate.c'\" unpacked with wrong size!
  fi
  # end of 'deflate.c'
fi
if test -f 'msdos/tcconfig.tc.UU' -a "${1}" != "-c" ; then
  echo shar: Will not clobber existing file \"'msdos/tcconfig.tc.UU'\"
else
  echo shar: Extracting \"'msdos/tcconfig.tc.UU'\" \(2366 characters\)
  sed "s/^X//" >'msdos/tcconfig.tc.UU' <<'END_OF_FILE'
Xbegin 666 msdos/tcconfig.tc
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XM @   !$  0 ($@ "  $ $P " !D %  "    %0 "  $ %@ "  ( %P "  $
XM&  "    9  !  %E  $  68  0 !9P !  %H  $  6D  0 !:@ !  %K  $
XM &P  0 !;0 !  %N  $  6\  0 !<  !  %Q  $  '(  0 !<P !  !T  $
XM 74  0 !=@ !  %W  $  7@  0 !>0 !  %Z  $  7L  0  ?  !  %]  $
XM 7X  0 !?P !  &   $  ((  0  A  !  &%  $  <@  0  R0 !  '*  $
XM ,L  0  S  !  #-  $  ,X  0 !SP !  #0  $ &=$  0!DT@ ! "#5  $
XM -<  0  V  !  '9  $  =H  0 !VP !  #<  $  =T  0 !W@ !  #?  $
XM .   0  X0 !  #B  $  2P!1
XM                                                         "T!
XM@ !#.EQ40UQ)3D-,541%
XM
XM                                                     "X!@ !#
XM.EQ40UQ,24(
XM
XM                                                 "\!4 !:25 N
XM4%)*
XM                                         # !!  S,@  ,0$% #(U
XM    ,@$% #$P,   ,P%_
XM
XM
XM           T 1X *@                                      -0$>
XM "H                                      #8!'@ J
XM                           W 1X *@
XM            . $> "H                                      #D!
XM'@ J                                       Z 1X *@
XM                            .P$> "H
XM             #P!'@ J                                       ]
XM 8
XM
XM                                                       ^ 00
XM.    #\!4
XM                                                         $ !
XM1 !#.EQ40P
XM                                 $$!4
XM
X9                         /__ @ :
X
Xend
END_OF_FILE
  if test 2366 -ne `wc -c <'msdos/tcconfig.tc.UU'`; then
    echo shar: \"'msdos/tcconfig.tc.UU'\" unpacked with wrong size!
  else
    echo shar: Uudecoding \"'msdos/tcconfig.tc'\" \(1690 characters\)
    cat msdos/tcconfig.tc.UU | uudecode
    if test 1690 -ne `wc -c <'msdos/tcconfig.tc'`; then
      echo shar: \"'msdos/tcconfig.tc'\" uudecoded with wrong size!
    else
      rm msdos/tcconfig.tc.UU
    fi
  fi
  # end of 'msdos/tcconfig.tc.UU'
fi
if test -f 'os2/os2zip.c.UU' -a "${1}" != "-c" ; then
  echo shar: Will not clobber existing file \"'os2/os2zip.c.UU'\"
else
  echo shar: Extracting \"'os2/os2zip.c.UU'\" \(28901 characters\)
  sed "s/^X//" >'os2/os2zip.c.UU' <<'END_OF_FILE'
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Xend
END_OF_FILE
 if test 28901 -ne `wc -c <'os2/os2zip.c.UU'`; then
    echo shar: \"'os2/os2zip.c.UU'\" unpacked with wrong size!
  else
    echo shar: Uudecoding \"'os2/os2zip.c'\" \(20954 characters\)
    cat os2/os2zip.c.UU | uudecode
    if test 20954 -ne `wc -c <'os2/os2zip.c'`; then
      echo shar: \"'os2/os2zip.c'\" uudecoded with wrong size!
    else
      rm os2/os2zip.c.UU
    fi
  fi
  # end of 'os2/os2zip.c.UU'
fi
echo shar: End of archive 5 \(of 11\).
cp /dev/null ark5isdone
MISSING=""
for I in 1 2 3 4 5 6 7 8 9 10 11 ; do
    if test ! -f ark${I}isdone ; then
    MISSING="${MISSING} ${I}"
    fi
done
if test "${MISSING}" = "" ; then
    echo You have unpacked all 11 archives.
    rm -f ark[1-9]isdone ark[1-9][0-9]isdone
else
    echo You still must unpack the following archives:
    echo "        " ${MISSING}
fi
exit 0
exit 0 # Just in case...