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ldivmod, uldivmod: fix qdivrem calls
[minix.git] / common / dist / zlib / contrib / inflate86 / inffas86.c
blob466d769375a9eb19eb327f81f83bd0684c83f089
1 /* $NetBSD: inffas86.c,v 1.1.1.1 2006/01/14 20:10:53 christos Exp $ */
2
3 /* inffas86.c is a hand tuned assembler version of
4 *
5 * inffast.c -- fast decoding
6 * Copyright (C) 1995-2003 Mark Adler
7 * For conditions of distribution and use, see copyright notice in zlib.h
8 *
9 * Copyright (C) 2003 Chris Anderson <christop@charm.net>
10 * Please use the copyright conditions above.
11 *
12 * Dec-29-2003 -- I added AMD64 inflate asm support. This version is also
13 * slightly quicker on x86 systems because, instead of using rep movsb to copy
14 * data, it uses rep movsw, which moves data in 2-byte chunks instead of single
15 * bytes. I've tested the AMD64 code on a Fedora Core 1 + the x86_64 updates
16 * from http://fedora.linux.duke.edu/fc1_x86_64
17 * which is running on an Athlon 64 3000+ / Gigabyte GA-K8VT800M system with
18 * 1GB ram. The 64-bit version is about 4% faster than the 32-bit version,
19 * when decompressing mozilla-source-1.3.tar.gz.
20 *
21 * Mar-13-2003 -- Most of this is derived from inffast.S which is derived from
22 * the gcc -S output of zlib-1.2.0/inffast.c. Zlib-1.2.0 is in beta release at
23 * the moment. I have successfully compiled and tested this code with gcc2.96,
24 * gcc3.2, icc5.0, msvc6.0. It is very close to the speed of inffast.S
25 * compiled with gcc -DNO_MMX, but inffast.S is still faster on the P3 with MMX
26 * enabled. I will attempt to merge the MMX code into this version. Newer
27 * versions of this and inffast.S can be found at
28 * http://www.eetbeetee.com/zlib/ and http://www.charm.net/~christop/zlib/
29 */
30
31 #include "zutil.h"
32 #include "inftrees.h"
33 #include "inflate.h"
34 #include "inffast.h"
35
36 /* Mark Adler's comments from inffast.c: */
37
38 /*
39 Decode literal, length, and distance codes and write out the resulting
40 literal and match bytes until either not enough input or output is
41 available, an end-of-block is encountered, or a data error is encountered.
42 When large enough input and output buffers are supplied to inflate(), for
43 example, a 16K input buffer and a 64K output buffer, more than 95% of the
44 inflate execution time is spent in this routine.
45
46 Entry assumptions:
47
48 state->mode == LEN
49 strm->avail_in >= 6
50 strm->avail_out >= 258
51 start >= strm->avail_out
52 state->bits < 8
53
54 On return, state->mode is one of:
55
56 LEN -- ran out of enough output space or enough available input
57 TYPE -- reached end of block code, inflate() to interpret next block
58 BAD -- error in block data
59
60 Notes:
61
62 - The maximum input bits used by a length/distance pair is 15 bits for the
63 length code, 5 bits for the length extra, 15 bits for the distance code,
64 and 13 bits for the distance extra. This totals 48 bits, or six bytes.
65 Therefore if strm->avail_in >= 6, then there is enough input to avoid
66 checking for available input while decoding.
67
68 - The maximum bytes that a single length/distance pair can output is 258
69 bytes, which is the maximum length that can be coded. inflate_fast()
70 requires strm->avail_out >= 258 for each loop to avoid checking for
71 output space.
72 */
73 void inflate_fast(strm, start)
74 z_streamp strm;
75 unsigned start; /* inflate()'s starting value for strm->avail_out */
76 {
77 struct inflate_state FAR *state;
78 struct inffast_ar {
79 /* 64 32 x86 x86_64 */
80 /* ar offset register */
81 /* 0 0 */ void *esp; /* esp save */
82 /* 8 4 */ void *ebp; /* ebp save */
83 /* 16 8 */ unsigned char FAR *in; /* esi rsi local strm->next_in */
84 /* 24 12 */ unsigned char FAR *last; /* r9 while in < last */
85 /* 32 16 */ unsigned char FAR *out; /* edi rdi local strm->next_out */
86 /* 40 20 */ unsigned char FAR *beg; /* inflate()'s init next_out */
87 /* 48 24 */ unsigned char FAR *end; /* r10 while out < end */
88 /* 56 28 */ unsigned char FAR *window;/* size of window, wsize!=0 */
89 /* 64 32 */ code const FAR *lcode; /* ebp rbp local strm->lencode */
90 /* 72 36 */ code const FAR *dcode; /* r11 local strm->distcode */
91 /* 80 40 */ unsigned long hold; /* edx rdx local strm->hold */
92 /* 88 44 */ unsigned bits; /* ebx rbx local strm->bits */
93 /* 92 48 */ unsigned wsize; /* window size */
94 /* 96 52 */ unsigned write; /* window write index */
95 /*100 56 */ unsigned lmask; /* r12 mask for lcode */
96 /*104 60 */ unsigned dmask; /* r13 mask for dcode */
97 /*108 64 */ unsigned len; /* r14 match length */
98 /*112 68 */ unsigned dist; /* r15 match distance */
99 /*116 72 */ unsigned status; /* set when state chng*/
100 } ar;
101
102 #if defined( __GNUC__ ) && defined( __amd64__ ) && ! defined( __i386 )
103 #define PAD_AVAIL_IN 6
104 #define PAD_AVAIL_OUT 258
105 #else
106 #define PAD_AVAIL_IN 5
107 #define PAD_AVAIL_OUT 257
108 #endif
109
110 /* copy state to local variables */
111 state = (struct inflate_state FAR *)strm->state;
112 ar.in = strm->next_in;
113 ar.last = ar.in + (strm->avail_in - PAD_AVAIL_IN);
114 ar.out = strm->next_out;
115 ar.beg = ar.out - (start - strm->avail_out);
116 ar.end = ar.out + (strm->avail_out - PAD_AVAIL_OUT);
117 ar.wsize = state->wsize;
118 ar.write = state->write;
119 ar.window = state->window;
120 ar.hold = state->hold;
121 ar.bits = state->bits;
122 ar.lcode = state->lencode;
123 ar.dcode = state->distcode;
124 ar.lmask = (1U << state->lenbits) - 1;
125 ar.dmask = (1U << state->distbits) - 1;
126
127 /* decode literals and length/distances until end-of-block or not enough
128 input data or output space */
129
130 /* align in on 1/2 hold size boundary */
131 while (((unsigned long)(void *)ar.in & (sizeof(ar.hold) / 2 - 1)) != 0) {
132 ar.hold += (unsigned long)*ar.in++ << ar.bits;
133 ar.bits += 8;
134 }
135
136 #if defined( __GNUC__ ) && defined( __amd64__ ) && ! defined( __i386 )
137 __asm__ __volatile__ (
138 " leaq %0, %%rax\n"
139 " movq %%rbp, 8(%%rax)\n" /* save regs rbp and rsp */
140 " movq %%rsp, (%%rax)\n"
141 " movq %%rax, %%rsp\n" /* make rsp point to &ar */
142 " movq 16(%%rsp), %%rsi\n" /* rsi = in */
143 " movq 32(%%rsp), %%rdi\n" /* rdi = out */
144 " movq 24(%%rsp), %%r9\n" /* r9 = last */
145 " movq 48(%%rsp), %%r10\n" /* r10 = end */
146 " movq 64(%%rsp), %%rbp\n" /* rbp = lcode */
147 " movq 72(%%rsp), %%r11\n" /* r11 = dcode */
148 " movq 80(%%rsp), %%rdx\n" /* rdx = hold */
149 " movl 88(%%rsp), %%ebx\n" /* ebx = bits */
150 " movl 100(%%rsp), %%r12d\n" /* r12d = lmask */
151 " movl 104(%%rsp), %%r13d\n" /* r13d = dmask */
152 /* r14d = len */
153 /* r15d = dist */
154 " cld\n"
155 " cmpq %%rdi, %%r10\n"
156 " je .L_one_time\n" /* if only one decode left */
157 " cmpq %%rsi, %%r9\n"
158 " je .L_one_time\n"
159 " jmp .L_do_loop\n"
160
161 ".L_one_time:\n"
162 " movq %%r12, %%r8\n" /* r8 = lmask */
163 " cmpb $32, %%bl\n"
164 " ja .L_get_length_code_one_time\n"
165
166 " lodsl\n" /* eax = *(uint *)in++ */
167 " movb %%bl, %%cl\n" /* cl = bits, needs it for shifting */
168 " addb $32, %%bl\n" /* bits += 32 */
169 " shlq %%cl, %%rax\n"
170 " orq %%rax, %%rdx\n" /* hold |= *((uint *)in)++ << bits */
171 " jmp .L_get_length_code_one_time\n"
172
173 ".align 32,0x90\n"
174 ".L_while_test:\n"
175 " cmpq %%rdi, %%r10\n"
176 " jbe .L_break_loop\n"
177 " cmpq %%rsi, %%r9\n"
178 " jbe .L_break_loop\n"
179
180 ".L_do_loop:\n"
181 " movq %%r12, %%r8\n" /* r8 = lmask */
182 " cmpb $32, %%bl\n"
183 " ja .L_get_length_code\n" /* if (32 < bits) */
184
185 " lodsl\n" /* eax = *(uint *)in++ */
186 " movb %%bl, %%cl\n" /* cl = bits, needs it for shifting */
187 " addb $32, %%bl\n" /* bits += 32 */
188 " shlq %%cl, %%rax\n"
189 " orq %%rax, %%rdx\n" /* hold |= *((uint *)in)++ << bits */
190
191 ".L_get_length_code:\n"
192 " andq %%rdx, %%r8\n" /* r8 &= hold */
193 " movl (%%rbp,%%r8,4), %%eax\n" /* eax = lcode[hold & lmask] */
194
195 " movb %%ah, %%cl\n" /* cl = this.bits */
196 " subb %%ah, %%bl\n" /* bits -= this.bits */
197 " shrq %%cl, %%rdx\n" /* hold >>= this.bits */
198
199 " testb %%al, %%al\n"
200 " jnz .L_test_for_length_base\n" /* if (op != 0) 45.7% */
201
202 " movq %%r12, %%r8\n" /* r8 = lmask */
203 " shrl $16, %%eax\n" /* output this.val char */
204 " stosb\n"
205
206 ".L_get_length_code_one_time:\n"
207 " andq %%rdx, %%r8\n" /* r8 &= hold */
208 " movl (%%rbp,%%r8,4), %%eax\n" /* eax = lcode[hold & lmask] */
209
210 ".L_dolen:\n"
211 " movb %%ah, %%cl\n" /* cl = this.bits */
212 " subb %%ah, %%bl\n" /* bits -= this.bits */
213 " shrq %%cl, %%rdx\n" /* hold >>= this.bits */
214
215 " testb %%al, %%al\n"
216 " jnz .L_test_for_length_base\n" /* if (op != 0) 45.7% */
217
218 " shrl $16, %%eax\n" /* output this.val char */
219 " stosb\n"
220 " jmp .L_while_test\n"
221
222 ".align 32,0x90\n"
223 ".L_test_for_length_base:\n"
224 " movl %%eax, %%r14d\n" /* len = this */
225 " shrl $16, %%r14d\n" /* len = this.val */
226 " movb %%al, %%cl\n"
227
228 " testb $16, %%al\n"
229 " jz .L_test_for_second_level_length\n" /* if ((op & 16) == 0) 8% */
230 " andb $15, %%cl\n" /* op &= 15 */
231 " jz .L_decode_distance\n" /* if (!op) */
232
233 ".L_add_bits_to_len:\n"
234 " subb %%cl, %%bl\n"
235 " xorl %%eax, %%eax\n"
236 " incl %%eax\n"
237 " shll %%cl, %%eax\n"
238 " decl %%eax\n"
239 " andl %%edx, %%eax\n" /* eax &= hold */
240 " shrq %%cl, %%rdx\n"
241 " addl %%eax, %%r14d\n" /* len += hold & mask[op] */
242
243 ".L_decode_distance:\n"
244 " movq %%r13, %%r8\n" /* r8 = dmask */
245 " cmpb $32, %%bl\n"
246 " ja .L_get_distance_code\n" /* if (32 < bits) */
247
248 " lodsl\n" /* eax = *(uint *)in++ */
249 " movb %%bl, %%cl\n" /* cl = bits, needs it for shifting */
250 " addb $32, %%bl\n" /* bits += 32 */
251 " shlq %%cl, %%rax\n"
252 " orq %%rax, %%rdx\n" /* hold |= *((uint *)in)++ << bits */
253
254 ".L_get_distance_code:\n"
255 " andq %%rdx, %%r8\n" /* r8 &= hold */
256 " movl (%%r11,%%r8,4), %%eax\n" /* eax = dcode[hold & dmask] */
257
258 ".L_dodist:\n"
259 " movl %%eax, %%r15d\n" /* dist = this */
260 " shrl $16, %%r15d\n" /* dist = this.val */
261 " movb %%ah, %%cl\n"
262 " subb %%ah, %%bl\n" /* bits -= this.bits */
263 " shrq %%cl, %%rdx\n" /* hold >>= this.bits */
264 " movb %%al, %%cl\n" /* cl = this.op */
265
266 " testb $16, %%al\n" /* if ((op & 16) == 0) */
267 " jz .L_test_for_second_level_dist\n"
268 " andb $15, %%cl\n" /* op &= 15 */
269 " jz .L_check_dist_one\n"
270
271 ".L_add_bits_to_dist:\n"
272 " subb %%cl, %%bl\n"
273 " xorl %%eax, %%eax\n"
274 " incl %%eax\n"
275 " shll %%cl, %%eax\n"
276 " decl %%eax\n" /* (1 << op) - 1 */
277 " andl %%edx, %%eax\n" /* eax &= hold */
278 " shrq %%cl, %%rdx\n"
279 " addl %%eax, %%r15d\n" /* dist += hold & ((1 << op) - 1) */
280
281 ".L_check_window:\n"
282 " movq %%rsi, %%r8\n" /* save in so from can use it's reg */
283 " movq %%rdi, %%rax\n"
284 " subq 40(%%rsp), %%rax\n" /* nbytes = out - beg */
285
286 " cmpl %%r15d, %%eax\n"
287 " jb .L_clip_window\n" /* if (dist > nbytes) 4.2% */
288
289 " movl %%r14d, %%ecx\n" /* ecx = len */
290 " movq %%rdi, %%rsi\n"
291 " subq %%r15, %%rsi\n" /* from = out - dist */
292
293 " sarl %%ecx\n"
294 " jnc .L_copy_two\n" /* if len % 2 == 0 */
295
296 " rep movsw\n"
297 " movb (%%rsi), %%al\n"
298 " movb %%al, (%%rdi)\n"
299 " incq %%rdi\n"
300
301 " movq %%r8, %%rsi\n" /* move in back to %rsi, toss from */
302 " jmp .L_while_test\n"
303
304 ".L_copy_two:\n"
305 " rep movsw\n"
306 " movq %%r8, %%rsi\n" /* move in back to %rsi, toss from */
307 " jmp .L_while_test\n"
308
309 ".align 32,0x90\n"
310 ".L_check_dist_one:\n"
311 " cmpl $1, %%r15d\n" /* if dist 1, is a memset */
312 " jne .L_check_window\n"
313 " cmpq %%rdi, 40(%%rsp)\n" /* if out == beg, outside window */
314 " je .L_check_window\n"
315
316 " movl %%r14d, %%ecx\n" /* ecx = len */
317 " movb -1(%%rdi), %%al\n"
318 " movb %%al, %%ah\n"
319
320 " sarl %%ecx\n"
321 " jnc .L_set_two\n"
322 " movb %%al, (%%rdi)\n"
323 " incq %%rdi\n"
324
325 ".L_set_two:\n"
326 " rep stosw\n"
327 " jmp .L_while_test\n"
328
329 ".align 32,0x90\n"
330 ".L_test_for_second_level_length:\n"
331 " testb $64, %%al\n"
332 " jnz .L_test_for_end_of_block\n" /* if ((op & 64) != 0) */
333
334 " xorl %%eax, %%eax\n"
335 " incl %%eax\n"
336 " shll %%cl, %%eax\n"
337 " decl %%eax\n"
338 " andl %%edx, %%eax\n" /* eax &= hold */
339 " addl %%r14d, %%eax\n" /* eax += len */
340 " movl (%%rbp,%%rax,4), %%eax\n" /* eax = lcode[val+(hold&mask[op])]*/
341 " jmp .L_dolen\n"
342
343 ".align 32,0x90\n"
344 ".L_test_for_second_level_dist:\n"
345 " testb $64, %%al\n"
346 " jnz .L_invalid_distance_code\n" /* if ((op & 64) != 0) */
347
348 " xorl %%eax, %%eax\n"
349 " incl %%eax\n"
350 " shll %%cl, %%eax\n"
351 " decl %%eax\n"
352 " andl %%edx, %%eax\n" /* eax &= hold */
353 " addl %%r15d, %%eax\n" /* eax += dist */
354 " movl (%%r11,%%rax,4), %%eax\n" /* eax = dcode[val+(hold&mask[op])]*/
355 " jmp .L_dodist\n"
356
357 ".align 32,0x90\n"
358 ".L_clip_window:\n"
359 " movl %%eax, %%ecx\n" /* ecx = nbytes */
360 " movl 92(%%rsp), %%eax\n" /* eax = wsize, prepare for dist cmp */
361 " negl %%ecx\n" /* nbytes = -nbytes */
362
363 " cmpl %%r15d, %%eax\n"
364 " jb .L_invalid_distance_too_far\n" /* if (dist > wsize) */
365
366 " addl %%r15d, %%ecx\n" /* nbytes = dist - nbytes */
367 " cmpl $0, 96(%%rsp)\n"
368 " jne .L_wrap_around_window\n" /* if (write != 0) */
369
370 " movq 56(%%rsp), %%rsi\n" /* from = window */
371 " subl %%ecx, %%eax\n" /* eax -= nbytes */
372 " addq %%rax, %%rsi\n" /* from += wsize - nbytes */
373
374 " movl %%r14d, %%eax\n" /* eax = len */
375 " cmpl %%ecx, %%r14d\n"
376 " jbe .L_do_copy\n" /* if (nbytes >= len) */
377
378 " subl %%ecx, %%eax\n" /* eax -= nbytes */
379 " rep movsb\n"
380 " movq %%rdi, %%rsi\n"
381 " subq %%r15, %%rsi\n" /* from = &out[ -dist ] */
382 " jmp .L_do_copy\n"
383
384 ".align 32,0x90\n"
385 ".L_wrap_around_window:\n"
386 " movl 96(%%rsp), %%eax\n" /* eax = write */
387 " cmpl %%eax, %%ecx\n"
388 " jbe .L_contiguous_in_window\n" /* if (write >= nbytes) */
389
390 " movl 92(%%rsp), %%esi\n" /* from = wsize */
391 " addq 56(%%rsp), %%rsi\n" /* from += window */
392 " addq %%rax, %%rsi\n" /* from += write */
393 " subq %%rcx, %%rsi\n" /* from -= nbytes */
394 " subl %%eax, %%ecx\n" /* nbytes -= write */
395
396 " movl %%r14d, %%eax\n" /* eax = len */
397 " cmpl %%ecx, %%eax\n"
398 " jbe .L_do_copy\n" /* if (nbytes >= len) */
399
400 " subl %%ecx, %%eax\n" /* len -= nbytes */
401 " rep movsb\n"
402 " movq 56(%%rsp), %%rsi\n" /* from = window */
403 " movl 96(%%rsp), %%ecx\n" /* nbytes = write */
404 " cmpl %%ecx, %%eax\n"
405 " jbe .L_do_copy\n" /* if (nbytes >= len) */
406
407 " subl %%ecx, %%eax\n" /* len -= nbytes */
408 " rep movsb\n"
409 " movq %%rdi, %%rsi\n"
410 " subq %%r15, %%rsi\n" /* from = out - dist */
411 " jmp .L_do_copy\n"
412
413 ".align 32,0x90\n"
414 ".L_contiguous_in_window:\n"
415 " movq 56(%%rsp), %%rsi\n" /* rsi = window */
416 " addq %%rax, %%rsi\n"
417 " subq %%rcx, %%rsi\n" /* from += write - nbytes */
418
419 " movl %%r14d, %%eax\n" /* eax = len */
420 " cmpl %%ecx, %%eax\n"
421 " jbe .L_do_copy\n" /* if (nbytes >= len) */
422
423 " subl %%ecx, %%eax\n" /* len -= nbytes */
424 " rep movsb\n"
425 " movq %%rdi, %%rsi\n"
426 " subq %%r15, %%rsi\n" /* from = out - dist */
427 " jmp .L_do_copy\n" /* if (nbytes >= len) */
428
429 ".align 32,0x90\n"
430 ".L_do_copy:\n"
431 " movl %%eax, %%ecx\n" /* ecx = len */
432 " rep movsb\n"
433
434 " movq %%r8, %%rsi\n" /* move in back to %esi, toss from */
435 " jmp .L_while_test\n"
436
437 ".L_test_for_end_of_block:\n"
438 " testb $32, %%al\n"
439 " jz .L_invalid_literal_length_code\n"
440 " movl $1, 116(%%rsp)\n"
441 " jmp .L_break_loop_with_status\n"
442
443 ".L_invalid_literal_length_code:\n"
444 " movl $2, 116(%%rsp)\n"
445 " jmp .L_break_loop_with_status\n"
446
447 ".L_invalid_distance_code:\n"
448 " movl $3, 116(%%rsp)\n"
449 " jmp .L_break_loop_with_status\n"
450
451 ".L_invalid_distance_too_far:\n"
452 " movl $4, 116(%%rsp)\n"
453 " jmp .L_break_loop_with_status\n"
454
455 ".L_break_loop:\n"
456 " movl $0, 116(%%rsp)\n"
457
458 ".L_break_loop_with_status:\n"
459 /* put in, out, bits, and hold back into ar and pop esp */
460 " movq %%rsi, 16(%%rsp)\n" /* in */
461 " movq %%rdi, 32(%%rsp)\n" /* out */
462 " movl %%ebx, 88(%%rsp)\n" /* bits */
463 " movq %%rdx, 80(%%rsp)\n" /* hold */
464 " movq (%%rsp), %%rax\n" /* restore rbp and rsp */
465 " movq 8(%%rsp), %%rbp\n"
466 " movq %%rax, %%rsp\n"
467 :
468 : "m" (ar)
469 : "memory", "%rax", "%rbx", "%rcx", "%rdx", "%rsi", "%rdi",
470 "%r8", "%r9", "%r10", "%r11", "%r12", "%r13", "%r14", "%r15"
471 );
472 #elif ( defined( __GNUC__ ) || defined( __ICC ) ) && defined( __i386 )
473 __asm__ __volatile__ (
474 " leal %0, %%eax\n"
475 " movl %%esp, (%%eax)\n" /* save esp, ebp */
476 " movl %%ebp, 4(%%eax)\n"
477 " movl %%eax, %%esp\n"
478 " movl 8(%%esp), %%esi\n" /* esi = in */
479 " movl 16(%%esp), %%edi\n" /* edi = out */
480 " movl 40(%%esp), %%edx\n" /* edx = hold */
481 " movl 44(%%esp), %%ebx\n" /* ebx = bits */
482 " movl 32(%%esp), %%ebp\n" /* ebp = lcode */
483
484 " cld\n"
485 " jmp .L_do_loop\n"
486
487 ".align 32,0x90\n"
488 ".L_while_test:\n"
489 " cmpl %%edi, 24(%%esp)\n" /* out < end */
490 " jbe .L_break_loop\n"
491 " cmpl %%esi, 12(%%esp)\n" /* in < last */
492 " jbe .L_break_loop\n"
493
494 ".L_do_loop:\n"
495 " cmpb $15, %%bl\n"
496 " ja .L_get_length_code\n" /* if (15 < bits) */
497
498 " xorl %%eax, %%eax\n"
499 " lodsw\n" /* al = *(ushort *)in++ */
500 " movb %%bl, %%cl\n" /* cl = bits, needs it for shifting */
501 " addb $16, %%bl\n" /* bits += 16 */
502 " shll %%cl, %%eax\n"
503 " orl %%eax, %%edx\n" /* hold |= *((ushort *)in)++ << bits */
504
505 ".L_get_length_code:\n"
506 " movl 56(%%esp), %%eax\n" /* eax = lmask */
507 " andl %%edx, %%eax\n" /* eax &= hold */
508 " movl (%%ebp,%%eax,4), %%eax\n" /* eax = lcode[hold & lmask] */
509
510 ".L_dolen:\n"
511 " movb %%ah, %%cl\n" /* cl = this.bits */
512 " subb %%ah, %%bl\n" /* bits -= this.bits */
513 " shrl %%cl, %%edx\n" /* hold >>= this.bits */
514
515 " testb %%al, %%al\n"
516 " jnz .L_test_for_length_base\n" /* if (op != 0) 45.7% */
517
518 " shrl $16, %%eax\n" /* output this.val char */
519 " stosb\n"
520 " jmp .L_while_test\n"
521
522 ".align 32,0x90\n"
523 ".L_test_for_length_base:\n"
524 " movl %%eax, %%ecx\n" /* len = this */
525 " shrl $16, %%ecx\n" /* len = this.val */
526 " movl %%ecx, 64(%%esp)\n" /* save len */
527 " movb %%al, %%cl\n"
528
529 " testb $16, %%al\n"
530 " jz .L_test_for_second_level_length\n" /* if ((op & 16) == 0) 8% */
531 " andb $15, %%cl\n" /* op &= 15 */
532 " jz .L_decode_distance\n" /* if (!op) */
533 " cmpb %%cl, %%bl\n"
534 " jae .L_add_bits_to_len\n" /* if (op <= bits) */
535
536 " movb %%cl, %%ch\n" /* stash op in ch, freeing cl */
537 " xorl %%eax, %%eax\n"
538 " lodsw\n" /* al = *(ushort *)in++ */
539 " movb %%bl, %%cl\n" /* cl = bits, needs it for shifting */
540 " addb $16, %%bl\n" /* bits += 16 */
541 " shll %%cl, %%eax\n"
542 " orl %%eax, %%edx\n" /* hold |= *((ushort *)in)++ << bits */
543 " movb %%ch, %%cl\n" /* move op back to ecx */
544
545 ".L_add_bits_to_len:\n"
546 " subb %%cl, %%bl\n"
547 " xorl %%eax, %%eax\n"
548 " incl %%eax\n"
549 " shll %%cl, %%eax\n"
550 " decl %%eax\n"
551 " andl %%edx, %%eax\n" /* eax &= hold */
552 " shrl %%cl, %%edx\n"
553 " addl %%eax, 64(%%esp)\n" /* len += hold & mask[op] */
554
555 ".L_decode_distance:\n"
556 " cmpb $15, %%bl\n"
557 " ja .L_get_distance_code\n" /* if (15 < bits) */
558
559 " xorl %%eax, %%eax\n"
560 " lodsw\n" /* al = *(ushort *)in++ */
561 " movb %%bl, %%cl\n" /* cl = bits, needs it for shifting */
562 " addb $16, %%bl\n" /* bits += 16 */
563 " shll %%cl, %%eax\n"
564 " orl %%eax, %%edx\n" /* hold |= *((ushort *)in)++ << bits */
565
566 ".L_get_distance_code:\n"
567 " movl 60(%%esp), %%eax\n" /* eax = dmask */
568 " movl 36(%%esp), %%ecx\n" /* ecx = dcode */
569 " andl %%edx, %%eax\n" /* eax &= hold */
570 " movl (%%ecx,%%eax,4), %%eax\n"/* eax = dcode[hold & dmask] */
571
572 ".L_dodist:\n"
573 " movl %%eax, %%ebp\n" /* dist = this */
574 " shrl $16, %%ebp\n" /* dist = this.val */
575 " movb %%ah, %%cl\n"
576 " subb %%ah, %%bl\n" /* bits -= this.bits */
577 " shrl %%cl, %%edx\n" /* hold >>= this.bits */
578 " movb %%al, %%cl\n" /* cl = this.op */
579
580 " testb $16, %%al\n" /* if ((op & 16) == 0) */
581 " jz .L_test_for_second_level_dist\n"
582 " andb $15, %%cl\n" /* op &= 15 */
583 " jz .L_check_dist_one\n"
584 " cmpb %%cl, %%bl\n"
585 " jae .L_add_bits_to_dist\n" /* if (op <= bits) 97.6% */
586
587 " movb %%cl, %%ch\n" /* stash op in ch, freeing cl */
588 " xorl %%eax, %%eax\n"
589 " lodsw\n" /* al = *(ushort *)in++ */
590 " movb %%bl, %%cl\n" /* cl = bits, needs it for shifting */
591 " addb $16, %%bl\n" /* bits += 16 */
592 " shll %%cl, %%eax\n"
593 " orl %%eax, %%edx\n" /* hold |= *((ushort *)in)++ << bits */
594 " movb %%ch, %%cl\n" /* move op back to ecx */
595
596 ".L_add_bits_to_dist:\n"
597 " subb %%cl, %%bl\n"
598 " xorl %%eax, %%eax\n"
599 " incl %%eax\n"
600 " shll %%cl, %%eax\n"
601 " decl %%eax\n" /* (1 << op) - 1 */
602 " andl %%edx, %%eax\n" /* eax &= hold */
603 " shrl %%cl, %%edx\n"
604 " addl %%eax, %%ebp\n" /* dist += hold & ((1 << op) - 1) */
605
606 ".L_check_window:\n"
607 " movl %%esi, 8(%%esp)\n" /* save in so from can use it's reg */
608 " movl %%edi, %%eax\n"
609 " subl 20(%%esp), %%eax\n" /* nbytes = out - beg */
610
611 " cmpl %%ebp, %%eax\n"
612 " jb .L_clip_window\n" /* if (dist > nbytes) 4.2% */
613
614 " movl 64(%%esp), %%ecx\n" /* ecx = len */
615 " movl %%edi, %%esi\n"
616 " subl %%ebp, %%esi\n" /* from = out - dist */
617
618 " sarl %%ecx\n"
619 " jnc .L_copy_two\n" /* if len % 2 == 0 */
620
621 " rep movsw\n"
622 " movb (%%esi), %%al\n"
623 " movb %%al, (%%edi)\n"
624 " incl %%edi\n"
625
626 " movl 8(%%esp), %%esi\n" /* move in back to %esi, toss from */
627 " movl 32(%%esp), %%ebp\n" /* ebp = lcode */
628 " jmp .L_while_test\n"
629
630 ".L_copy_two:\n"
631 " rep movsw\n"
632 " movl 8(%%esp), %%esi\n" /* move in back to %esi, toss from */
633 " movl 32(%%esp), %%ebp\n" /* ebp = lcode */
634 " jmp .L_while_test\n"
635
636 ".align 32,0x90\n"
637 ".L_check_dist_one:\n"
638 " cmpl $1, %%ebp\n" /* if dist 1, is a memset */
639 " jne .L_check_window\n"
640 " cmpl %%edi, 20(%%esp)\n"
641 " je .L_check_window\n" /* out == beg, if outside window */
642
643 " movl 64(%%esp), %%ecx\n" /* ecx = len */
644 " movb -1(%%edi), %%al\n"
645 " movb %%al, %%ah\n"
646
647 " sarl %%ecx\n"
648 " jnc .L_set_two\n"
649 " movb %%al, (%%edi)\n"
650 " incl %%edi\n"
651
652 ".L_set_two:\n"
653 " rep stosw\n"
654 " movl 32(%%esp), %%ebp\n" /* ebp = lcode */
655 " jmp .L_while_test\n"
656
657 ".align 32,0x90\n"
658 ".L_test_for_second_level_length:\n"
659 " testb $64, %%al\n"
660 " jnz .L_test_for_end_of_block\n" /* if ((op & 64) != 0) */
661
662 " xorl %%eax, %%eax\n"
663 " incl %%eax\n"
664 " shll %%cl, %%eax\n"
665 " decl %%eax\n"
666 " andl %%edx, %%eax\n" /* eax &= hold */
667 " addl 64(%%esp), %%eax\n" /* eax += len */
668 " movl (%%ebp,%%eax,4), %%eax\n" /* eax = lcode[val+(hold&mask[op])]*/
669 " jmp .L_dolen\n"
670
671 ".align 32,0x90\n"
672 ".L_test_for_second_level_dist:\n"
673 " testb $64, %%al\n"
674 " jnz .L_invalid_distance_code\n" /* if ((op & 64) != 0) */
675
676 " xorl %%eax, %%eax\n"
677 " incl %%eax\n"
678 " shll %%cl, %%eax\n"
679 " decl %%eax\n"
680 " andl %%edx, %%eax\n" /* eax &= hold */
681 " addl %%ebp, %%eax\n" /* eax += dist */
682 " movl 36(%%esp), %%ecx\n" /* ecx = dcode */
683 " movl (%%ecx,%%eax,4), %%eax\n" /* eax = dcode[val+(hold&mask[op])]*/
684 " jmp .L_dodist\n"
685
686 ".align 32,0x90\n"
687 ".L_clip_window:\n"
688 " movl %%eax, %%ecx\n"
689 " movl 48(%%esp), %%eax\n" /* eax = wsize */
690 " negl %%ecx\n" /* nbytes = -nbytes */
691 " movl 28(%%esp), %%esi\n" /* from = window */
692
693 " cmpl %%ebp, %%eax\n"
694 " jb .L_invalid_distance_too_far\n" /* if (dist > wsize) */
695
696 " addl %%ebp, %%ecx\n" /* nbytes = dist - nbytes */
697 " cmpl $0, 52(%%esp)\n"
698 " jne .L_wrap_around_window\n" /* if (write != 0) */
699
700 " subl %%ecx, %%eax\n"
701 " addl %%eax, %%esi\n" /* from += wsize - nbytes */
702
703 " movl 64(%%esp), %%eax\n" /* eax = len */
704 " cmpl %%ecx, %%eax\n"
705 " jbe .L_do_copy\n" /* if (nbytes >= len) */
706
707 " subl %%ecx, %%eax\n" /* len -= nbytes */
708 " rep movsb\n"
709 " movl %%edi, %%esi\n"
710 " subl %%ebp, %%esi\n" /* from = out - dist */
711 " jmp .L_do_copy\n"
712
713 ".align 32,0x90\n"
714 ".L_wrap_around_window:\n"
715 " movl 52(%%esp), %%eax\n" /* eax = write */
716 " cmpl %%eax, %%ecx\n"
717 " jbe .L_contiguous_in_window\n" /* if (write >= nbytes) */
718
719 " addl 48(%%esp), %%esi\n" /* from += wsize */
720 " addl %%eax, %%esi\n" /* from += write */
721 " subl %%ecx, %%esi\n" /* from -= nbytes */
722 " subl %%eax, %%ecx\n" /* nbytes -= write */
723
724 " movl 64(%%esp), %%eax\n" /* eax = len */
725 " cmpl %%ecx, %%eax\n"
726 " jbe .L_do_copy\n" /* if (nbytes >= len) */
727
728 " subl %%ecx, %%eax\n" /* len -= nbytes */
729 " rep movsb\n"
730 " movl 28(%%esp), %%esi\n" /* from = window */
731 " movl 52(%%esp), %%ecx\n" /* nbytes = write */
732 " cmpl %%ecx, %%eax\n"
733 " jbe .L_do_copy\n" /* if (nbytes >= len) */
734
735 " subl %%ecx, %%eax\n" /* len -= nbytes */
736 " rep movsb\n"
737 " movl %%edi, %%esi\n"
738 " subl %%ebp, %%esi\n" /* from = out - dist */
739 " jmp .L_do_copy\n"
740
741 ".align 32,0x90\n"
742 ".L_contiguous_in_window:\n"
743 " addl %%eax, %%esi\n"
744 " subl %%ecx, %%esi\n" /* from += write - nbytes */
745
746 " movl 64(%%esp), %%eax\n" /* eax = len */
747 " cmpl %%ecx, %%eax\n"
748 " jbe .L_do_copy\n" /* if (nbytes >= len) */
749
750 " subl %%ecx, %%eax\n" /* len -= nbytes */
751 " rep movsb\n"
752 " movl %%edi, %%esi\n"
753 " subl %%ebp, %%esi\n" /* from = out - dist */
754 " jmp .L_do_copy\n" /* if (nbytes >= len) */
755
756 ".align 32,0x90\n"
757 ".L_do_copy:\n"
758 " movl %%eax, %%ecx\n"
759 " rep movsb\n"
760
761 " movl 8(%%esp), %%esi\n" /* move in back to %esi, toss from */
762 " movl 32(%%esp), %%ebp\n" /* ebp = lcode */
763 " jmp .L_while_test\n"
764
765 ".L_test_for_end_of_block:\n"
766 " testb $32, %%al\n"
767 " jz .L_invalid_literal_length_code\n"
768 " movl $1, 72(%%esp)\n"
769 " jmp .L_break_loop_with_status\n"
770
771 ".L_invalid_literal_length_code:\n"
772 " movl $2, 72(%%esp)\n"
773 " jmp .L_break_loop_with_status\n"
774
775 ".L_invalid_distance_code:\n"
776 " movl $3, 72(%%esp)\n"
777 " jmp .L_break_loop_with_status\n"
778
779 ".L_invalid_distance_too_far:\n"
780 " movl 8(%%esp), %%esi\n"
781 " movl $4, 72(%%esp)\n"
782 " jmp .L_break_loop_with_status\n"
783
784 ".L_break_loop:\n"
785 " movl $0, 72(%%esp)\n"
786
787 ".L_break_loop_with_status:\n"
788 /* put in, out, bits, and hold back into ar and pop esp */
789 " movl %%esi, 8(%%esp)\n" /* save in */
790 " movl %%edi, 16(%%esp)\n" /* save out */
791 " movl %%ebx, 44(%%esp)\n" /* save bits */
792 " movl %%edx, 40(%%esp)\n" /* save hold */
793 " movl 4(%%esp), %%ebp\n" /* restore esp, ebp */
794 " movl (%%esp), %%esp\n"
795 :
796 : "m" (ar)
797 : "memory", "%eax", "%ebx", "%ecx", "%edx", "%esi", "%edi"
798 );
799 #elif defined( _MSC_VER ) && ! defined( _M_AMD64 )
800 __asm {
801 lea eax, ar
802 mov [eax], esp /* save esp, ebp */
803 mov [eax+4], ebp
804 mov esp, eax
805 mov esi, [esp+8] /* esi = in */
806 mov edi, [esp+16] /* edi = out */
807 mov edx, [esp+40] /* edx = hold */
808 mov ebx, [esp+44] /* ebx = bits */
809 mov ebp, [esp+32] /* ebp = lcode */
810
811 cld
812 jmp L_do_loop
813
814 ALIGN 4
815 L_while_test:
816 cmp [esp+24], edi
817 jbe L_break_loop
818 cmp [esp+12], esi
819 jbe L_break_loop
820
821 L_do_loop:
822 cmp bl, 15
823 ja L_get_length_code /* if (15 < bits) */
824
825 xor eax, eax
826 lodsw /* al = *(ushort *)in++ */
827 mov cl, bl /* cl = bits, needs it for shifting */
828 add bl, 16 /* bits += 16 */
829 shl eax, cl
830 or edx, eax /* hold |= *((ushort *)in)++ << bits */
831
832 L_get_length_code:
833 mov eax, [esp+56] /* eax = lmask */
834 and eax, edx /* eax &= hold */
835 mov eax, [ebp+eax*4] /* eax = lcode[hold & lmask] */
836
837 L_dolen:
838 mov cl, ah /* cl = this.bits */
839 sub bl, ah /* bits -= this.bits */
840 shr edx, cl /* hold >>= this.bits */
841
842 test al, al
843 jnz L_test_for_length_base /* if (op != 0) 45.7% */
844
845 shr eax, 16 /* output this.val char */
846 stosb
847 jmp L_while_test
848
849 ALIGN 4
850 L_test_for_length_base:
851 mov ecx, eax /* len = this */
852 shr ecx, 16 /* len = this.val */
853 mov [esp+64], ecx /* save len */
854 mov cl, al
855
856 test al, 16
857 jz L_test_for_second_level_length /* if ((op & 16) == 0) 8% */
858 and cl, 15 /* op &= 15 */
859 jz L_decode_distance /* if (!op) */
860 cmp bl, cl
861 jae L_add_bits_to_len /* if (op <= bits) */
862
863 mov ch, cl /* stash op in ch, freeing cl */
864 xor eax, eax
865 lodsw /* al = *(ushort *)in++ */
866 mov cl, bl /* cl = bits, needs it for shifting */
867 add bl, 16 /* bits += 16 */
868 shl eax, cl
869 or edx, eax /* hold |= *((ushort *)in)++ << bits */
870 mov cl, ch /* move op back to ecx */
871
872 L_add_bits_to_len:
873 sub bl, cl
874 xor eax, eax
875 inc eax
876 shl eax, cl
877 dec eax
878 and eax, edx /* eax &= hold */
879 shr edx, cl
880 add [esp+64], eax /* len += hold & mask[op] */
881
882 L_decode_distance:
883 cmp bl, 15
884 ja L_get_distance_code /* if (15 < bits) */
885
886 xor eax, eax
887 lodsw /* al = *(ushort *)in++ */
888 mov cl, bl /* cl = bits, needs it for shifting */
889 add bl, 16 /* bits += 16 */
890 shl eax, cl
891 or edx, eax /* hold |= *((ushort *)in)++ << bits */
892
893 L_get_distance_code:
894 mov eax, [esp+60] /* eax = dmask */
895 mov ecx, [esp+36] /* ecx = dcode */
896 and eax, edx /* eax &= hold */
897 mov eax, [ecx+eax*4]/* eax = dcode[hold & dmask] */
898
899 L_dodist:
900 mov ebp, eax /* dist = this */
901 shr ebp, 16 /* dist = this.val */
902 mov cl, ah
903 sub bl, ah /* bits -= this.bits */
904 shr edx, cl /* hold >>= this.bits */
905 mov cl, al /* cl = this.op */
906
907 test al, 16 /* if ((op & 16) == 0) */
908 jz L_test_for_second_level_dist
909 and cl, 15 /* op &= 15 */
910 jz L_check_dist_one
911 cmp bl, cl
912 jae L_add_bits_to_dist /* if (op <= bits) 97.6% */
913
914 mov ch, cl /* stash op in ch, freeing cl */
915 xor eax, eax
916 lodsw /* al = *(ushort *)in++ */
917 mov cl, bl /* cl = bits, needs it for shifting */
918 add bl, 16 /* bits += 16 */
919 shl eax, cl
920 or edx, eax /* hold |= *((ushort *)in)++ << bits */
921 mov cl, ch /* move op back to ecx */
922
923 L_add_bits_to_dist:
924 sub bl, cl
925 xor eax, eax
926 inc eax
927 shl eax, cl
928 dec eax /* (1 << op) - 1 */
929 and eax, edx /* eax &= hold */
930 shr edx, cl
931 add ebp, eax /* dist += hold & ((1 << op) - 1) */
932
933 L_check_window:
934 mov [esp+8], esi /* save in so from can use it's reg */
935 mov eax, edi
936 sub eax, [esp+20] /* nbytes = out - beg */
937
938 cmp eax, ebp
939 jb L_clip_window /* if (dist > nbytes) 4.2% */
940
941 mov ecx, [esp+64] /* ecx = len */
942 mov esi, edi
943 sub esi, ebp /* from = out - dist */
944
945 sar ecx, 1
946 jnc L_copy_two
947
948 rep movsw
949 mov al, [esi]
950 mov [edi], al
951 inc edi
952
953 mov esi, [esp+8] /* move in back to %esi, toss from */
954 mov ebp, [esp+32] /* ebp = lcode */
955 jmp L_while_test
956
957 L_copy_two:
958 rep movsw
959 mov esi, [esp+8] /* move in back to %esi, toss from */
960 mov ebp, [esp+32] /* ebp = lcode */
961 jmp L_while_test
962
963 ALIGN 4
964 L_check_dist_one:
965 cmp ebp, 1 /* if dist 1, is a memset */
966 jne L_check_window
967 cmp [esp+20], edi
968 je L_check_window /* out == beg, if outside window */
969
970 mov ecx, [esp+64] /* ecx = len */
971 mov al, [edi-1]
972 mov ah, al
973
974 sar ecx, 1
975 jnc L_set_two
976 mov [edi], al /* memset out with from[-1] */
977 inc edi
978
979 L_set_two:
980 rep stosw
981 mov ebp, [esp+32] /* ebp = lcode */
982 jmp L_while_test
983
984 ALIGN 4
985 L_test_for_second_level_length:
986 test al, 64
987 jnz L_test_for_end_of_block /* if ((op & 64) != 0) */
988
989 xor eax, eax
990 inc eax
991 shl eax, cl
992 dec eax
993 and eax, edx /* eax &= hold */
994 add eax, [esp+64] /* eax += len */
995 mov eax, [ebp+eax*4] /* eax = lcode[val+(hold&mask[op])]*/
996 jmp L_dolen
997
998 ALIGN 4
999 L_test_for_second_level_dist:
1000 test al, 64
1001 jnz L_invalid_distance_code /* if ((op & 64) != 0) */
1002
1003 xor eax, eax
1004 inc eax
1005 shl eax, cl
1006 dec eax
1007 and eax, edx /* eax &= hold */
1008 add eax, ebp /* eax += dist */
1009 mov ecx, [esp+36] /* ecx = dcode */
1010 mov eax, [ecx+eax*4] /* eax = dcode[val+(hold&mask[op])]*/
1011 jmp L_dodist
1012
1013 ALIGN 4
1014 L_clip_window:
1015 mov ecx, eax
1016 mov eax, [esp+48] /* eax = wsize */
1017 neg ecx /* nbytes = -nbytes */
1018 mov esi, [esp+28] /* from = window */
1019
1020 cmp eax, ebp
1021 jb L_invalid_distance_too_far /* if (dist > wsize) */
1022
1023 add ecx, ebp /* nbytes = dist - nbytes */
1024 cmp dword ptr [esp+52], 0
1025 jne L_wrap_around_window /* if (write != 0) */
1026
1027 sub eax, ecx
1028 add esi, eax /* from += wsize - nbytes */
1029
1030 mov eax, [esp+64] /* eax = len */
1031 cmp eax, ecx
1032 jbe L_do_copy /* if (nbytes >= len) */
1033
1034 sub eax, ecx /* len -= nbytes */
1035 rep movsb
1036 mov esi, edi
1037 sub esi, ebp /* from = out - dist */
1038 jmp L_do_copy
1039
1040 ALIGN 4
1041 L_wrap_around_window:
1042 mov eax, [esp+52] /* eax = write */
1043 cmp ecx, eax
1044 jbe L_contiguous_in_window /* if (write >= nbytes) */
1045
1046 add esi, [esp+48] /* from += wsize */
1047 add esi, eax /* from += write */
1048 sub esi, ecx /* from -= nbytes */
1049 sub ecx, eax /* nbytes -= write */
1050
1051 mov eax, [esp+64] /* eax = len */
1052 cmp eax, ecx
1053 jbe L_do_copy /* if (nbytes >= len) */
1054
1055 sub eax, ecx /* len -= nbytes */
1056 rep movsb
1057 mov esi, [esp+28] /* from = window */
1058 mov ecx, [esp+52] /* nbytes = write */
1059 cmp eax, ecx
1060 jbe L_do_copy /* if (nbytes >= len) */
1061
1062 sub eax, ecx /* len -= nbytes */
1063 rep movsb
1064 mov esi, edi
1065 sub esi, ebp /* from = out - dist */
1066 jmp L_do_copy
1067
1068 ALIGN 4
1069 L_contiguous_in_window:
1070 add esi, eax
1071 sub esi, ecx /* from += write - nbytes */
1072
1073 mov eax, [esp+64] /* eax = len */
1074 cmp eax, ecx
1075 jbe L_do_copy /* if (nbytes >= len) */
1076
1077 sub eax, ecx /* len -= nbytes */
1078 rep movsb
1079 mov esi, edi
1080 sub esi, ebp /* from = out - dist */
1081 jmp L_do_copy
1082
1083 ALIGN 4
1084 L_do_copy:
1085 mov ecx, eax
1086 rep movsb
1087
1088 mov esi, [esp+8] /* move in back to %esi, toss from */
1089 mov ebp, [esp+32] /* ebp = lcode */
1090 jmp L_while_test
1091
1092 L_test_for_end_of_block:
1093 test al, 32
1094 jz L_invalid_literal_length_code
1095 mov dword ptr [esp+72], 1
1096 jmp L_break_loop_with_status
1097
1098 L_invalid_literal_length_code:
1099 mov dword ptr [esp+72], 2
1100 jmp L_break_loop_with_status
1101
1102 L_invalid_distance_code:
1103 mov dword ptr [esp+72], 3
1104 jmp L_break_loop_with_status
1105
1106 L_invalid_distance_too_far:
1107 mov esi, [esp+4]
1108 mov dword ptr [esp+72], 4
1109 jmp L_break_loop_with_status
1110
1111 L_break_loop:
1112 mov dword ptr [esp+72], 0
1113
1114 L_break_loop_with_status:
1115 /* put in, out, bits, and hold back into ar and pop esp */
1116 mov [esp+8], esi /* save in */
1117 mov [esp+16], edi /* save out */
1118 mov [esp+44], ebx /* save bits */
1119 mov [esp+40], edx /* save hold */
1120 mov ebp, [esp+4] /* restore esp, ebp */
1121 mov esp, [esp]
1122 }
1123 #else
1124 #error "x86 architecture not defined"
1125 #endif
1126
1127 if (ar.status > 1) {
1128 if (ar.status == 2)
1129 strm->msg = "invalid literal/length code";
1130 else if (ar.status == 3)
1131 strm->msg = "invalid distance code";
1132 else
1133 strm->msg = "invalid distance too far back";
1134 state->mode = BAD;
1135 }
1136 else if ( ar.status == 1 ) {
1137 state->mode = TYPE;
1138 }
1139
1140 /* return unused bytes (on entry, bits < 8, so in won't go too far back) */
1141 ar.len = ar.bits >> 3;
1142 ar.in -= ar.len;
1143 ar.bits -= ar.len << 3;
1144 ar.hold &= (1U << ar.bits) - 1;
1145
1146 /* update state and return */
1147 strm->next_in = ar.in;
1148 strm->next_out = ar.out;
1149 strm->avail_in = (unsigned)(ar.in < ar.last ?
1150 PAD_AVAIL_IN + (ar.last - ar.in) :
1151 PAD_AVAIL_IN - (ar.in - ar.last));
1152 strm->avail_out = (unsigned)(ar.out < ar.end ?
1153 PAD_AVAIL_OUT + (ar.end - ar.out) :
1154 PAD_AVAIL_OUT - (ar.out - ar.end));
1155 state->hold = ar.hold;
1156 state->bits = ar.bits;
1157 return;
1158 }
1159
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