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[s-mailx.git] / obs-lzw.c
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1 /*@ S-nail - a mail user agent derived from Berkeley Mail.
2 *@ LZW file compression.
4 * Copyright (c) 2000-2004 Gunnar Ritter, Freiburg i. Br., Germany.
5 * Copyright (c) 2012 - 2017 Steffen (Daode) Nurpmeso <sdaoden@users.sf.net>.
6 */
7 /*-
8 * Copyright (c) 1985, 1986, 1992, 1993
9 * The Regents of the University of California. All rights reserved.
11 * This code is derived from software contributed to Berkeley by
12 * Diomidis Spinellis and James A. Woods, derived from original
13 * work by Spencer Thomas and Joseph Orost.
15 * Redistribution and use in source and binary forms, with or without
16 * modification, are permitted provided that the following conditions
17 * are met:
18 * 1. Redistributions of source code must retain the above copyright
19 * notice, this list of conditions and the following disclaimer.
20 * 2. Redistributions in binary form must reproduce the above copyright
21 * notice, this list of conditions and the following disclaimer in the
22 * documentation and/or other materials provided with the distribution.
23 * 4. Neither the name of the University nor the names of its contributors
24 * may be used to endorse or promote products derived from this software
25 * without specific prior written permission.
27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * SUCH DAMAGE.
40 /* from zopen.c 8.1 (Berkeley) 6/27/93 */
41 /* from FreeBSD: /repoman/r/ncvs/src/usr.bin/compress/zopen.c,v
42 * 1.5.6.1 2002/07/16 00:52:08 tjr Exp */
43 /* from FreeBSD: git://git.freebsd.org/freebsd,
44 * master:usr.bin/compress/zopen.c,
45 * (Fix handling of corrupt compress(1)ed data. [11:04], 2011-09-28) */
47 /*-
48 * lzw.c - File compression ala IEEE Computer, June 1984.
50 * Compress authors:
51 * Spencer W. Thomas (decvax!utah-cs!thomas)
52 * Jim McKie (decvax!mcvax!jim)
53 * Steve Davies (decvax!vax135!petsd!peora!srd)
54 * Ken Turkowski (decvax!decwrl!turtlevax!ken)
55 * James A. Woods (decvax!ihnp4!ames!jaw)
56 * Joe Orost (decvax!vax135!petsd!joe)
58 * Cleaned up and converted to library returning I/O streams by
59 * Diomidis Spinellis <dds@doc.ic.ac.uk>.
61 * Adopted for Heirloom mailx by Gunnar Ritter.
63 #undef n_FILE
64 #define n_FILE obs_lzw
66 #ifndef HAVE_AMALGAMATION
67 # include "nail.h"
68 #endif
70 EMPTY_FILE()
71 #ifdef HAVE_IMAP
72 /* Minimize differences to FreeBSDs usr.bin/compress/zopen.c */
73 #undef u_int
74 #define u_int unsigned int
75 #undef u_short
76 #define u_short unsigned short
77 #undef u_char
78 #define u_char unsigned char
79 #define count cnt
81 #define BITS 16 /* Default bits. */
82 #define HSIZE 69001 /* 95% occupancy */
84 /* A code_int must be able to hold 2**BITS values of type int, and also -1. */
85 typedef long code_int;
86 typedef long count_int;
88 typedef u_char char_type;
89 static char_type magic_header[] = {0x1F, 0x9D}; /* \037, \235 */
91 #define BIT_MASK 0x1f /* Defines for third byte of header. */
92 #define BLOCK_MASK 0x80
95 * Masks 0x40 and 0x20 are free. I think 0x20 should mean that there is
96 * a fourth header byte (for expansion).
98 #define INIT_BITS 9 /* Initial number of bits/code. */
100 #define MAXCODE(n_bits) ((1 << (n_bits)) - 1)
102 struct s_zstate {
103 FILE *zs_fp; /* File stream for I/O */
104 char zs_mode; /* r or w */
105 enum {
106 S_START, S_MIDDLE, S_EOF
107 } zs_state; /* State of computation */
108 u_int zs_n_bits; /* Number of bits/code. */
109 u_int zs_maxbits; /* User settable max # bits/code. */
110 code_int zs_maxcode; /* Maximum code, given n_bits. */
111 code_int zs_maxmaxcode; /* Should NEVER generate this code. */
112 count_int zs_htab [HSIZE];
113 u_short zs_codetab [HSIZE];
114 code_int zs_hsize; /* For dynamic table sizing. */
115 code_int zs_free_ent; /* First unused entry. */
117 * Block compression parameters -- after all codes are used up,
118 * and compression rate changes, start over.
120 int zs_block_compress;
121 int zs_clear_flg;
122 long zs_ratio;
123 count_int zs_checkpoint;
124 u_int zs_offset;
125 long zs_in_count; /* Length of input. */
126 long zs_bytes_out; /* Length of compressed output. */
127 long zs_out_count; /* # of codes output (for debugging). */
128 char_type zs_buf[BITS];
129 union {
130 struct {
131 long zs_fcode;
132 code_int zs_ent;
133 code_int zs_hsize_reg;
134 int zs_hshift;
135 } w; /* Write parameters */
136 struct {
137 char_type *zs_stackp;
138 int zs_finchar;
139 code_int zs_code, zs_oldcode, zs_incode;
140 int zs_roffset, zs_size;
141 char_type zs_gbuf[BITS];
142 } r; /* Read parameters */
143 } u;
146 /* Definitions to retain old variable names */
147 #define fp zs->zs_fp
148 #define zmode zs->zs_mode
149 #define state zs->zs_state
150 #define n_bits zs->zs_n_bits
151 #define maxbits zs->zs_maxbits
152 #define maxcode zs->zs_maxcode
153 #define maxmaxcode zs->zs_maxmaxcode
154 #define htab zs->zs_htab
155 #define codetab zs->zs_codetab
156 #define hsize zs->zs_hsize
157 #define free_ent zs->zs_free_ent
158 #define block_compress zs->zs_block_compress
159 #define clear_flg zs->zs_clear_flg
160 #define ratio zs->zs_ratio
161 #define checkpoint zs->zs_checkpoint
162 #define offset zs->zs_offset
163 #define in_count zs->zs_in_count
164 #define bytes_out zs->zs_bytes_out
165 #define out_count zs->zs_out_count
166 #define buf zs->zs_buf
167 #define fcode zs->u.w.zs_fcode
168 #define hsize_reg zs->u.w.zs_hsize_reg
169 #define ent zs->u.w.zs_ent
170 #define hshift zs->u.w.zs_hshift
171 #define stackp zs->u.r.zs_stackp
172 #define finchar zs->u.r.zs_finchar
173 #define code zs->u.r.zs_code
174 #define oldcode zs->u.r.zs_oldcode
175 #define incode zs->u.r.zs_incode
176 #define roffset zs->u.r.zs_roffset
177 #define size zs->u.r.zs_size
178 #define gbuf zs->u.r.zs_gbuf
181 * To save much memory, we overlay the table used by compress() with those
182 * used by decompress(). The tab_prefix table is the same size and type as
183 * the codetab. The tab_suffix table needs 2**BITS characters. We get this
184 * from the beginning of htab. The output stack uses the rest of htab, and
185 * contains characters. There is plenty of room for any possible stack
186 * (stack used to be 8000 characters).
189 #define htabof(i) htab[i]
190 #define codetabof(i) codetab[i]
192 #define tab_prefixof(i) codetabof(i)
193 #define tab_suffixof(i) ((char_type *)(htab))[i]
194 #define de_stack ((char_type *)&tab_suffixof(1 << BITS))
196 #define CHECK_GAP 10000 /* Ratio check interval. */
199 * the next two codes should not be changed lightly, as they must not
200 * lie within the contiguous general code space.
202 #define FIRST 257 /* First free entry. */
203 #define CLEAR 256 /* Table clear output code. */
205 static int cl_block(struct s_zstate *);
206 static void cl_hash(struct s_zstate *, count_int);
207 static code_int getcode(struct s_zstate *);
208 static int output(struct s_zstate *, code_int);
211 * Algorithm from "A Technique for High Performance Data Compression",
212 * Terry A. Welch, IEEE Computer Vol 17, No 6 (June 1984), pp 8-19.
214 * Algorithm:
215 * Modified Lempel-Ziv method (LZW). Basically finds common
216 * substrings and replaces them with a variable size code. This is
217 * deterministic, and can be done on the fly. Thus, the decompression
218 * procedure needs no input table, but tracks the way the table was built.
222 * compress write
224 * Algorithm: use open addressing double hashing (no chaining) on the
225 * prefix code / next character combination. We do a variant of Knuth's
226 * algorithm D (vol. 3, sec. 6.4) along with G. Knott's relatively-prime
227 * secondary probe. Here, the modular division first probe is gives way
228 * to a faster exclusive-or manipulation. Also do block compression with
229 * an adaptive reset, whereby the code table is cleared when the compression
230 * ratio decreases, but after the table fills. The variable-length output
231 * codes are re-sized at this point, and a special CLEAR code is generated
232 * for the decompressor. Late addition: construct the table according to
233 * file size for noticeable speed improvement on small files. Please direct
234 * questions about this implementation to ames!jaw.
236 FL int
237 zwrite(void *cookie, const char *wbp, int num)
239 code_int i;
240 int c, disp;
241 struct s_zstate *zs;
242 const u_char *bp;
243 u_char tmp;
244 int count;
246 if (num == 0)
247 return (0);
249 zs = cookie;
250 zmode = 'w';
251 count = num;
252 bp = (const u_char *)wbp;
253 if (state == S_MIDDLE)
254 goto middle;
255 state = S_MIDDLE;
257 maxmaxcode = 1L << maxbits;
258 if (fwrite(magic_header,
259 sizeof(char), sizeof(magic_header), fp) != sizeof(magic_header))
260 return (-1);
261 tmp = (u_char)((maxbits) | block_compress);
262 if (fwrite(&tmp, sizeof(char), sizeof(tmp), fp) != sizeof(tmp))
263 return (-1);
265 offset = 0;
266 bytes_out = 3; /* Includes 3-byte header mojo. */
267 out_count = 0;
268 clear_flg = 0;
269 ratio = 0;
270 in_count = 1;
271 checkpoint = CHECK_GAP;
272 maxcode = MAXCODE(n_bits = INIT_BITS);
273 free_ent = ((block_compress) ? FIRST : 256);
275 ent = *bp++;
276 --count;
278 hshift = 0;
279 for (fcode = (long)hsize; fcode < 65536L; fcode *= 2L)
280 hshift++;
281 hshift = 8 - hshift; /* Set hash code range bound. */
283 hsize_reg = hsize;
284 cl_hash(zs, (count_int)hsize_reg); /* Clear hash table. */
286 middle: for (i = 0; count--;) {
287 c = *bp++;
288 in_count++;
289 fcode = (long)(((long)c << maxbits) + ent);
290 i = ((c << hshift) ^ ent); /* Xor hashing. */
292 if (htabof(i) == fcode) {
293 ent = codetabof(i);
294 continue;
295 } else if ((long)htabof(i) < 0) /* Empty slot. */
296 goto nomatch;
297 disp = hsize_reg - i; /* Secondary hash (after G. Knott). */
298 if (i == 0)
299 disp = 1;
300 probe: if ((i -= disp) < 0)
301 i += hsize_reg;
303 if (htabof(i) == fcode) {
304 ent = codetabof(i);
305 continue;
307 if ((long)htabof(i) >= 0)
308 goto probe;
309 nomatch: if (output(zs, (code_int) ent) == -1)
310 return (-1);
311 out_count++;
312 ent = c;
313 if (free_ent < maxmaxcode) {
314 codetabof(i) = free_ent++; /* code -> hashtable */
315 htabof(i) = fcode;
316 } else if ((count_int)in_count >=
317 checkpoint && block_compress) {
318 if (cl_block(zs) == -1)
319 return (-1);
322 return (num);
325 FL int
326 zfree(void *cookie)
328 struct s_zstate *zs;
330 zs = cookie;
331 if (zmode == 'w') { /* Put out the final code. */
332 if (output(zs, (code_int) ent) == -1) {
333 free(zs);
334 return (-1);
336 out_count++;
337 if (output(zs, (code_int) - 1) == -1) {
338 free(zs);
339 return (-1);
342 free(zs);
343 return (0);
347 * Output the given code.
348 * Inputs:
349 * code: A n_bits-bit integer. If == -1, then EOF. This assumes
350 * that n_bits =< (long)wordsize - 1.
351 * Outputs:
352 * Outputs code to the file.
353 * Assumptions:
354 * Chars are 8 bits long.
355 * Algorithm:
356 * Maintain a BITS character long buffer (so that 8 codes will
357 * fit in it exactly). Use the VAX insv instruction to insert each
358 * code in turn. When the buffer fills up empty it and start over.
361 static char_type lmask[9] =
362 {0xff, 0xfe, 0xfc, 0xf8, 0xf0, 0xe0, 0xc0, 0x80, 0x00};
363 static char_type rmask[9] =
364 {0x00, 0x01, 0x03, 0x07, 0x0f, 0x1f, 0x3f, 0x7f, 0xff};
366 static int
367 output(struct s_zstate *zs, code_int ocode)
369 int r_off;
370 u_int bits;
371 char_type *bp;
373 r_off = offset;
374 bits = n_bits;
375 bp = buf;
376 if (ocode >= 0) {
377 /* Get to the first byte. */
378 bp += (r_off >> 3);
379 r_off &= 7;
381 * Since ocode is always >= 8 bits, only need to mask the first
382 * hunk on the left.
384 *bp = (*bp & rmask[r_off]) | ((ocode << r_off) & lmask[r_off]);
385 bp++;
386 bits -= (8 - r_off);
387 ocode >>= 8 - r_off;
388 /* Get any 8 bit parts in the middle (<=1 for up to 16 bits). */
389 if (bits >= 8) {
390 *bp++ = ocode;
391 ocode >>= 8;
392 bits -= 8;
394 /* Last bits. */
395 if (bits)
396 *bp = ocode;
397 offset += n_bits;
398 if (offset == (n_bits << 3)) {
399 bp = buf;
400 bits = n_bits;
401 bytes_out += bits;
402 if (fwrite(bp, sizeof(char), bits, fp) != bits)
403 return (-1);
404 bp += bits;
405 bits = 0;
406 offset = 0;
409 * If the next entry is going to be too big for the ocode size,
410 * then increase it, if possible.
412 if (free_ent > maxcode || (clear_flg > 0)) {
414 * Write the whole buffer, because the input side won't
415 * discover the size increase until after it has read it.
417 if (offset > 0) {
418 if (fwrite(buf, 1, n_bits, fp) != n_bits)
419 return (-1);
420 bytes_out += n_bits;
422 offset = 0;
424 if (clear_flg) {
425 maxcode = MAXCODE(n_bits = INIT_BITS);
426 clear_flg = 0;
427 } else {
428 n_bits++;
429 if (n_bits == maxbits)
430 maxcode = maxmaxcode;
431 else
432 maxcode = MAXCODE(n_bits);
435 } else {
436 /* At EOF, write the rest of the buffer. */
437 if (offset > 0) {
438 offset = (offset + 7) / 8;
439 if (fwrite(buf, 1, offset, fp) != offset)
440 return (-1);
441 bytes_out += offset;
443 offset = 0;
445 return (0);
449 * Decompress read. This routine adapts to the codes in the file building
450 * the "string" table on-the-fly; requiring no table to be stored in the
451 * compressed file. The tables used herein are shared with those of the
452 * compress() routine. See the definitions above.
454 FL int
455 zread(void *cookie, char *rbp, int num)
457 u_int count;
458 struct s_zstate *zs;
459 u_char *bp, header[3];
461 if (num == 0)
462 return (0);
464 zs = cookie;
465 count = num;
466 bp = (u_char *)rbp;
467 switch (state) {
468 case S_START:
469 state = S_MIDDLE;
470 break;
471 case S_MIDDLE:
472 goto middle;
473 case S_EOF:
474 goto eof;
477 /* Check the magic number */
478 if (fread(header,
479 sizeof(char), sizeof(header), fp) != sizeof(header) ||
480 memcmp(header, magic_header, sizeof(magic_header)) != 0) {
481 return (-1);
483 maxbits = header[2]; /* Set -b from file. */
484 block_compress = maxbits & BLOCK_MASK;
485 maxbits &= BIT_MASK;
486 maxmaxcode = 1L << maxbits;
487 if (maxbits > BITS || maxbits < 12) {
488 return (-1);
490 /* As above, initialize the first 256 entries in the table. */
491 maxcode = MAXCODE(n_bits = INIT_BITS);
492 for (code = 255; code >= 0; code--) {
493 tab_prefixof(code) = 0;
494 tab_suffixof(code) = (char_type) code;
496 free_ent = block_compress ? FIRST : 256;
498 finchar = oldcode = getcode(zs);
499 if (oldcode == -1) /* EOF already? */
500 return (0); /* Get out of here */
502 /* First code must be 8 bits = char. */
503 *bp++ = (u_char)finchar;
504 count--;
505 stackp = de_stack;
507 while ((code = getcode(zs)) > -1) {
509 if ((code == CLEAR) && block_compress) {
510 for (code = 255; code >= 0; code--)
511 tab_prefixof(code) = 0;
512 clear_flg = 1;
513 free_ent = FIRST;
514 oldcode = -1;
515 continue;
517 incode = code;
519 /* Special case for kWkWk string. */
520 if (code >= free_ent) {
521 if (code > free_ent || oldcode == -1) {
522 return (-1);
524 *stackp++ = finchar;
525 code = oldcode;
528 * The above condition ensures that code < free_ent.
529 * The construction of tab_prefixof in turn guarantees that
530 * each iteration decreases code and therefore stack usage is
531 * bound by 1 << BITS - 256.
534 /* Generate output characters in reverse order. */
535 while (code >= 256) {
536 *stackp++ = tab_suffixof(code);
537 code = tab_prefixof(code);
539 *stackp++ = finchar = tab_suffixof(code);
541 /* And put them out in forward order. */
542 middle: do {
543 if (count-- == 0)
544 return (num);
545 *bp++ = *--stackp;
546 } while (stackp > de_stack);
548 /* Generate the new entry. */
549 if ((code = free_ent) < maxmaxcode && oldcode != -1) {
550 tab_prefixof(code) = (u_short) oldcode;
551 tab_suffixof(code) = finchar;
552 free_ent = code + 1;
555 /* Remember previous code. */
556 oldcode = incode;
558 state = S_EOF;
559 eof: return (num - count);
563 * Read one code from the standard input. If EOF, return -1.
564 * Inputs:
565 * stdin
566 * Outputs:
567 * code or -1 is returned.
569 static code_int
570 getcode(struct s_zstate *zs)
572 code_int gcode;
573 int r_off, bits;
574 char_type *bp;
576 bp = gbuf;
577 if (clear_flg > 0 || roffset >= size || free_ent > maxcode) {
579 * If the next entry will be too big for the current gcode
580 * size, then we must increase the size. This implies reading
581 * a new buffer full, too.
583 if (free_ent > maxcode) {
584 n_bits++;
585 if (n_bits == maxbits) /* Won't get any bigger now. */
586 maxcode = maxmaxcode;
587 else
588 maxcode = MAXCODE(n_bits);
590 if (clear_flg > 0) {
591 maxcode = MAXCODE(n_bits = INIT_BITS);
592 clear_flg = 0;
594 size = fread(gbuf, 1, n_bits, fp);
595 if (size <= 0) /* End of file. */
596 return (-1);
597 roffset = 0;
598 /* Round size down to integral number of codes. */
599 size = (size << 3) - (n_bits - 1);
601 r_off = roffset;
602 bits = n_bits;
604 /* Get to the first byte. */
605 bp += (r_off >> 3);
606 r_off &= 7;
608 /* Get first part (low order bits). */
609 gcode = (*bp++ >> r_off);
610 bits -= (8 - r_off);
611 r_off = 8 - r_off; /* Now, roffset into gcode word. */
613 /* Get any 8 bit parts in the middle (<=1 for up to 16 bits). */
614 if (bits >= 8) {
615 gcode |= *bp++ << r_off;
616 r_off += 8;
617 bits -= 8;
620 /* High order bits. */
621 gcode |= (*bp & rmask[bits]) << r_off;
622 roffset += n_bits;
624 return (gcode);
627 static int
628 cl_block(struct s_zstate *zs) /* Table clear for block compress. */
630 long rat;
632 checkpoint = in_count + CHECK_GAP;
634 if (in_count > 0x007fffff) { /* Shift will overflow. */
635 rat = bytes_out >> 8;
636 if (rat == 0) /* Don't divide by zero. */
637 rat = 0x7fffffff;
638 else
639 rat = in_count / rat;
640 } else
641 rat = (in_count << 8) / bytes_out; /* 8 fractional bits. */
642 if (rat > ratio)
643 ratio = rat;
644 else {
645 ratio = 0;
646 cl_hash(zs, (count_int) hsize);
647 free_ent = FIRST;
648 clear_flg = 1;
649 if (output(zs, (code_int) CLEAR) == -1)
650 return (-1);
652 return (0);
655 static void
656 cl_hash(struct s_zstate *zs, count_int cl_hsize) /* Reset code table. */
658 count_int *htab_p;
659 long i, m1;
661 m1 = -1;
662 htab_p = htab + cl_hsize;
663 i = cl_hsize - 16;
664 do { /* Might use Sys V memset(3) here. */
665 *(htab_p - 16) = m1;
666 *(htab_p - 15) = m1;
667 *(htab_p - 14) = m1;
668 *(htab_p - 13) = m1;
669 *(htab_p - 12) = m1;
670 *(htab_p - 11) = m1;
671 *(htab_p - 10) = m1;
672 *(htab_p - 9) = m1;
673 *(htab_p - 8) = m1;
674 *(htab_p - 7) = m1;
675 *(htab_p - 6) = m1;
676 *(htab_p - 5) = m1;
677 *(htab_p - 4) = m1;
678 *(htab_p - 3) = m1;
679 *(htab_p - 2) = m1;
680 *(htab_p - 1) = m1;
681 htab_p -= 16;
682 } while ((i -= 16) >= 0);
683 for (i += 16; i > 0; i--)
684 *--htab_p = m1;
687 #undef fp
688 FL void *
689 zalloc(FILE *fp)
691 #define bits BITS
692 struct s_zstate *zs;
694 zs = scalloc(1, sizeof *zs);
695 maxbits = bits ? bits : BITS; /* User settable max # bits/code. */
696 maxmaxcode = 1L << maxbits; /* Should NEVER generate this code. */
697 hsize = HSIZE; /* For dynamic table sizing. */
698 free_ent = 0; /* First unused entry. */
699 block_compress = BLOCK_MASK;
700 clear_flg = 0;
701 ratio = 0;
702 checkpoint = CHECK_GAP;
703 in_count = 1; /* Length of input. */
704 out_count = 0; /* # of codes output (for debugging). */
705 state = S_START;
706 roffset = 0;
707 size = 0;
708 zs->zs_fp = fp;
709 return zs;
712 #undef u_int
713 #undef u_short
714 #undef u_char
715 #undef count
716 #undef BITS
717 #undef HSIZE
718 #undef BIT_MASK
719 #undef BLOCK_MASK
720 #undef INIT_BITS
721 #undef MAXCODE
722 #undef fp
723 #undef zmode
724 #undef state
725 #undef n_bits
726 #undef maxbits
727 #undef maxcode
728 #undef maxmaxcode
729 #undef htab
730 #undef codetab
731 #undef hsize
732 #undef free_ent
733 #undef block_compress
734 #undef clear_flg
735 #undef ratio
736 #undef checkpoint
737 #undef offset
738 #undef in_count
739 #undef bytes_out
740 #undef out_count
741 #undef buf
742 #undef fcode
743 #undef hsize_reg
744 #undef ent
745 #undef hshift
746 #undef stackp
747 #undef finchar
748 #undef code
749 #undef oldcode
750 #undef incode
751 #undef roffset
752 #undef size
753 #undef gbuf
754 #endif /* ndef HAVE_IMAP */